merge trunk

87 files changed, 3799 insertions, 2696 deletions

diff --git a/src/.gdbinit b/src/.gdbinit
index 74f44cc1007..7a6bfb07fed 100644
--- a/src/.gdbinit
+++ b/src/.gdbinit
@@ -1214,8 +1214,8 @@ show environment DISPLAY
 show environment TERM
 
 # When debugging, it is handy to be able to "return" from
-# fatal_error_backtrace when an assertion failure is non-fatal.
-break fatal_error_backtrace
+# terminate_due_to_signal when an assertion failure is non-fatal.
+break terminate_due_to_signal
 
 # x_error_quitter is defined only on X.  But window-system is set up
 # only at run time, during Emacs startup, so we need to defer setting
diff --git a/src/ChangeLog b/src/ChangeLog
index 508ac9925a8..f69ab42bd90 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -3,6 +3,547 @@
         * coding.c (decode_coding_ccl, encode_coding_ccl): Pay attention
         to the buffer relocation which may be caused by ccl_driver.
 
+2012-09-30  Jan Djärv  <jan.h.d@swipnet.se>
+
+        * nsfns.m (ns_frame_parm_handlers): Add x_set_fullscreen.
+
+        * nsterm.m (NEW_STYLE_FS): New define.
+        (ns_fullscreen_hook, windowWillEnterFullScreen)
+        (windowDidEnterFullScreen, windowWillExitFullScreen)
+        (windowDidExitFullScreen, toggleFullScreen, handleFS)
+        (setFSValue): New functions.
+        (EmacsFSWindow): New implementation.
+        (canBecomeKeyWindow): New function for EmacsFSWindow.
+        (ns_create_terminal): Set fullscreen_hook to ns_fullscreen_hook.
+        (dealloc): Release nonfs_window if in fullscreen.
+        (updateFrameSize:): Call windowDidMove to update top/left.
+        (windowWillResize:toSize:): Check if frame is still maximized.
+        (initFrameFromEmacs:): Initialize fs_state, fs_before_fs,
+        next_maximized, maximized_width, maximized_height and nonfs_window.
+        Call setCollectionBehavior if NEW_STYLE_FS.  Initialize bwidth and
+        tbar_height.
+        (windowWillUseStandardFrame:defaultFrame:): Update frame parameter
+        fullscreen. Set maximized_width/height.  Act on next_maximized.
+
+        * nsterm.h (MAC_OS_X_VERSION_10_7, MAC_OS_X_VERSION_10_8): New.
+        (EmacsView): Add variables for fullscreen.
+        (handleFS, setFSValue, toggleFullScreen): New in EmacsView.
+        (EmacsFSWindow): New interface for fullscreen.
+
+2012-09-30  Juanma Barranquero  <lekktu@gmail.com>
+
+        * makefile.w32-in ($(BLD)/profiler.$(O)): Update dependencies.
+
+2012-09-30  Chong Yidong  <cyd@gnu.org>
+
+        * fns.c (Frandom): Doc fix.
+
+2012-09-30  Martin Rudalics  <rudalics@gmx.at>
+
+        * window.c (Vwindow_combination_limit): New default value.
+        (Qwindow_size): New symbol replacing Qtemp_buffer_resize.
+
+2012-09-30  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * syssignal.h (PROFILER_CPU_SUPPORT): Don't define if PROFILING.
+        Suggested by Eli Zaretskii in
+        <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00811.html>.
+
+2012-09-30  Eli Zaretskii  <eliz@gnu.org>
+
+        * profiler.c (Fprofiler_cpu_stop): Use timer_settime only if
+        HAVE_TIMER_SETTIME is defined.
+
+2012-09-30  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Profiler improvements: more-accurate timers, overflow checks.
+        * profiler.c: Don't include stdio.h, limits.h, sys/time.h,
+        signal.h, setjmp.h.  Include systime.h instead.
+        (saturated_add): New function.
+        (record_backtrace, current_sample_interval): Use EMACS_INT, not size_t.
+        (record_backtrace, handle_profiler_signal): Saturate on fixnum overflow.
+        (profiler_timer, profiler_timer_ok) [HAVE_TIMER_SETTIME]:
+        New static vars.
+        (enum profiler_cpu_running): New enum.
+        (profiler_cpu_running): Now of that enum type, not bool.
+        All uses changed to store the new value.
+        (handle_profiler_signal): Rename from sigprof_handler_1,
+        for consistency with other handlers.  Do not check whether
+        cpu_log is a hash-table if garbage collecting, since it
+        doesn't matter in that case.
+        (deliver_profiler_signal): Rename from sigprof_handler,
+        for consistency with other handlers.
+        (setup_cpu_timer): New function, with much of what used to be in
+        Fprofiler_cpu_start.  Check for out-of-range argument.
+        Prefer timer_settime if available, and prefer
+        thread cputime clocks, then process cputime clocks, then
+        monotonic clocks, to the old realtime clock.  Use make_timeval
+        to round more-correctly when falling back to setitimer.
+        (Fprofiler_cpu_start): Use it.
+        (Fprofiler_cpu_stop): Prefer timer_settime if available.
+        Don't assume that passing NULL as the 2nd argument of setitimer
+        is the same as passing a pointer to all-zero storage.
+        Ignore SIGPROF afterwards.
+        (malloc_probe): Saturate at MOST_POSITIVE_FIXNUM.
+        * sysdep.c (emacs_sigaction_init): Also mask out SIGPROF in
+        non-fatal signal handlers.  Ignore SIGPROF on startup.
+        * syssignal.h (PROFILER_CPU_SUPPORT): Define this macro here, not
+        in profiler.c, since sysdep.c now uses it.
+
+        * sysdep.c (handle_fatal_signal): Bump backtrace size to 40.
+        Suggested by Eli Zaretskii in
+        <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00796.html>.
+
+2012-09-29  Juanma Barranquero  <lekktu@gmail.com>
+
+        * makefile.w32-in ($(BLD)/profiler.$(O)): Update dependencies.
+
+2012-09-29  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+        * lisp.h (struct backtrace): Remove indirection for `function' field.
+        * xdisp.c (redisplay_internal):
+        * profiler.c (record_backtrace, sigprof_handler_1):
+        * alloc.c (Fgarbage_collect):
+        * eval.c (interactive_p, Fsignal, eval_sub, Ffuncall, Fbacktrace)
+        (Fbacktrace_frame): Adjust accordingly.
+
+2012-09-28  Glenn Morris  <rgm@gnu.org>
+
+        * eval.c (Frun_hook_with_args, Frun_hook_with_args_until_success)
+        (Frun_hook_with_args_until_failure): Doc fixes.
+
+2012-09-28  Eli Zaretskii  <eliz@gnu.org>
+
+        * xdisp.c (syms_of_xdisp) <Qredisplay_internal>: Rename from
+        Qautomatic_redisplay and change the symbol name.  All users changed.
+
+2012-09-28  Tomohiro Matsuyama  <tomo@cx4a.org>
+
+        * profiler.c (sigprof_handler): Fix race condition.
+
+2012-09-28  Glenn Morris  <rgm@gnu.org>
+
+        * lread.c (lisp_file_lexically_bound_p): Handle #! lines.  (Bug#12528)
+
+2012-09-27  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Check more robustly for timer_settime.
+        * Makefile.in (LIB_TIMER_TIME): New macro.
+        (LIBES): Add it.
+        * atimer.c (alarm_timer, alarm_timer_ok, set_alarm, init_atimer):
+        Use HAVE_TIMER_SETTIME, not SIGEV_SIGNAL, to decide whether to
+        call timer_settime.
+
+2012-09-26  Tomohiro Matsuyama  <tomo@cx4a.org>
+
+        * profiler.c (Fprofiler_cpu_start): Remove unnecessary flag SA_SIGINFO.
+
+2012-09-26  Juanma Barranquero  <lekktu@gmail.com>
+
+        * makefile.w32-in ($(BLD)/profiler.$(O)): Update dependencies.
+
+2012-09-26  Paul Eggert  <eggert@cs.ucla.edu>
+
+        * character.h (MAYBE_UNIFY_CHAR): Remove.
+        * charset.c, charset.h (maybe_unify_char): Now static.
+        * charset.c (decode_char): Use maybe_unify_char, not MAYBE_UNIFY_CHAR.
+        Since this stuff is now private to charset.c, there's no need for
+        a public macro and no need to inline by hand.
+
+2012-09-26  Tomohiro Matsuyama  <tomo@cx4a.org>
+            Stefan Monnier  <monnier@iro.umontreal.ca>
+            Juanma Barranquero  <lekktu@gmail.com>
+
+        * profiler.c: New file.
+        * Makefile.in (base_obj): Add profiler.o.
+        * makefile.w32-in (OBJ2, GLOBAL_SOURCES): Add profiler.c.
+        ($(BLD)/profiler.$(O)): New target.
+        * emacs.c (main): Call syms_of_profiler.
+        * alloc.c (Qautomatic_gc): New constant.
+        (MALLOC_PROBE): New macro.
+        (xmalloc, xzalloc, xrealloc, lisp_malloc, lisp_align_malloc): Use it.
+        (total_bytes_of_live_objects): New function.
+        (Fgarbage_collect): Use it.  Record itself in backtrace_list.
+        Call malloc_probe for the memory profiler.
+        (syms_of_alloc): Define Qautomatic_gc.
+        * eval.c (eval_sub, Ffuncall): Reorder assignments to avoid
+        race condition.
+        (struct backtrace): Move definition...
+        * lisp.h (struct backtrace): ..here.
+        (Qautomatic_gc, profiler_memory_running): Declare vars.
+        (malloc_probe, syms_of_profiler): Declare functions.
+        * xdisp.c (Qautomatic_redisplay): New constant.
+        (redisplay_internal): Record itself in backtrace_list.
+        (syms_of_xdisp): Define Qautomatic_redisplay.
+
+2012-09-25  Eli Zaretskii  <eliz@gnu.org>
+2012-09-25  Juanma Barranquero  <lekktu@gmail.com>
+
+        * makefile.w32-in ($(BLD)/callproc.$(O)): Update dependencies.
+
+2012-09-25  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Prefer POSIX timers if available.
+        They avoid a race if the timer is too close to the current time.
+        * atimer.c (alarm_timer, alarm_timer_ok) [SIGEV_SIGNAL]: New static vars.
+        (set_alarm) [SIGEV_SIGNAL]: Use POSIX timers if available.
+        (init_atimer) [SIGEV_SIGNAL]: Initialize them.
+
+2012-09-25  Eli Zaretskii  <eliz@gnu.org>
+
+        * coding.c (CHAR_STRING_ADVANCE_NO_UNIFY): Make it an alias of
+        CHAR_STRING_ADVANCE.
+        (STRING_CHAR_ADVANCE_NO_UNIFY): Make it an alias of
+        STRING_CHAR_ADVANCE.
+
+2012-09-25  Juanma Barranquero  <lekktu@gmail.com>
+
+        Move Vlibrary_cache to emacs.c and reset before dumping.
+
+        * lisp.h (reset_image_types): Declare.
+        [WINDOWSNT] (Vlibrary_cache): Declare.
+
+        * image.c (reset_image_types): New function.
+
+        * emacs.c [WINDOWSNT] (Vlibrary_cache): Move from w32.c.
+        (syms_of_emacs) [WINDOWSNT] <Vlibrary_cache>: Initialize and staticpro.
+        (Fdump_emacs): Reset Vlibrary_cache and image_types.
+
+        * w32.c (Vlibrary_cache): Do not define; moved to emacs.c
+        (globals_of_w32) <Vlibrary_cache>: Do not initialize.
+
+        * w32.h (Vlibrary_cache): Do not declare.
+
+2012-09-25  Eli Zaretskii  <eliz@gnu.org>
+
+        * w32proc.c (sys_signal): Handle all signals defined by the
+        MS-Windows runtime, not just SIGCHLD.  Actually install the signal
+        handlers for signals supported by Windows.  Don't override
+        term_ntproc as the handler for SIGABRT.
+        (sigaction): Rewrite to call sys_signal instead of duplicating its
+        code.
+        (sys_kill): Improve commentary.
+
+        * w32.c (term_ntproc): Accept (and ignore) one argument, for
+        consistency with a signature of a signal handler.  All callers
+        changed.
+        (init_ntproc): Accept an argument DUMPING.  If dumping, don't
+        install term_ntproc as a signal handler for SIGABRT, as that
+        should be done by the dumped Emacs.
+
+        * w32.h (init_ntproc, term_ntproc): Adjust prototypes.
+
+        * w32select.c (term_w32select): Protect against repeated
+        invocation by setting clipboard_owner to NULL after calling
+        DestroyWindow.
+
+        * emacs.c (shut_down_emacs, main): Adapt the calls to init_ntproc
+        and term_ntproc to their modified signatures.
+
+        * character.c (char_string, string_char): Remove calls to
+        MAYBE_UNIFY_CHAR.  See the discussion starting at
+        http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00433.html
+        for the details.
+
+2012-09-25  Chong Yidong  <cyd@gnu.org>
+
+        * xdisp.c (mode_line_inverse_video): Delete obsolete variable.
+
+2012-09-24  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+        * bytecode.c (exec_byte_code): Signal an error instead of aborting,
+        when encountering an unknown bytecode.
+
+2012-09-24  Paul Eggert  <eggert@cs.ucla.edu>
+
+        image.c, indent.c: Use bool for booleans.
+        * dispextern.h (struct image_type): Members valid_p, load, init
+        now return bool, not int.  All uses changed.
+        * image.c: Omit unnecessary static decls.
+        (x_create_bitmap_mask, x_build_heuristic_mask):
+        Return void, not int, since callers don't care about the return value.
+        (x_create_bitmap_mask, define_image_type, valid_image_p)
+        (struct image_keyword, parse_image_spec, image_spec_value)
+        (check_image_size, image_background)
+        (image_background_transparent, x_clear_image_1)
+        (postprocess_image, lookup_image, x_check_image_size)
+        (x_create_x_image_and_pixmap, xbm_image_p)
+        (Create_Pixmap_From_Bitmap_Data, xbm_read_bitmap_data)
+        (xbm_load_image, xbm_file_p, xbm_load, xpm_lookup_color)
+        (init_xpm_functions, xpm_valid_color_symbols_p, xpm_image_p)
+        (xpm_load, xpm_load_image, lookup_rgb_color, lookup_pixel_color)
+        (x_to_xcolors, x_build_heuristic_mask, pbm_image_p, pbm_load)
+        (png_image_p, init_png_functions, png_load_body, png_load)
+        (jpeg_image_p, init_jpeg_functions, jpeg_load_body, jpeg_load)
+        (tiff_image_p, init_tiff_functions, tiff_load, gif_image_p)
+        (init_gif_functions, gif_load, imagemagick_image_p)
+        (imagemagick_load_image, imagemagick_load, svg_image_p)
+        (init_svg_functions, svg_load, svg_load_image, gs_image_p)
+        (gs_load):
+        * nsimage.m (ns_load_image):
+        * nsterm.m (ns_defined_color):
+        * xfaces.c (tty_lookup_color, tty_defined_color, defined_color):
+        * xfns.c (x_defined_color):
+        * xterm.c (x_alloc_lighter_color_for_widget)
+        (x_alloc_nearest_color_1, x_alloc_nearest_color)
+        (x_alloc_lighter_color):
+        * indent.c (disptab_matches_widthtab, current_column)
+        (scan_for_column, string_display_width, indented_beyond_p)
+        (compute_motion, vmotion, Fvertical_motion):
+        Use bool for booleans.
+
+2012-09-24  Chong Yidong  <cyd@gnu.org>
+
+        * chartab.c (Fset_char_table_default): Obsolete function removed.
+
+2012-09-23  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Move pid_t related decls out of lisp.h.
+        * lisp.h, syswait.h (record_child_status_change, wait_for_termination)
+        (interruptible_wait_for_termination):
+        Move these decls from lisp.h to syswait.h, since they use pid_t.
+        Needed on FreeBSD; see Herbert J. Skuhra in
+        <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00571.html>.
+        * callproc.c: Include syswait.h.
+
+        gnutls.c, gtkutil.c: Use bool for boolean.
+        * gnutls.c (gnutls_global_initialized, init_gnutls_functions)
+        (emacs_gnutls_handle_error):
+        * gtkutil.c (xg_check_special_colors, xg_prepare_tooltip)
+        (xg_hide_tooltip, xg_create_frame_widgets)
+        (create_dialog, xg_uses_old_file_dialog)
+        (xg_get_file_with_chooser, xg_get_file_with_selection)
+        (xg_get_file_name, xg_have_tear_offs, create_menus, xg_create_widget)
+        (xg_item_label_same_p, xg_update_menubar)
+        (xg_modify_menubar_widgets, xg_event_is_for_menubar)
+        (xg_ignore_gtk_scrollbar, xg_set_toolkit_scroll_bar_thumb)
+        (xg_event_is_for_scrollbar, xg_pack_tool_bar, xg_make_tool_item)
+        (is_box_type, xg_tool_item_stale_p, xg_update_tool_bar_sizes)
+        (update_frame_tool_bar, free_frame_tool_bar):
+        * gtkutil.c, w32term.c, xterm.c (x_wm_set_size_hint):
+        * nsmenu.m (ns_update_menubar):
+        * nsmenu.m, w32menu.c, xmenu.c (set_frame_menubar):
+        * xfns.c (Fx_show_tip) [USE_GTK]:
+        Use bool for boolean.
+        * gtkutil.c (xg_update_frame_menubar):
+        * xmenu.c (update_frame_menubar):
+        Return void, not int, since caller ignores return value.
+        * gtkutil.c (xg_change_toolbar_position):
+        Return void, not 1.
+
+2012-09-23  Juanma Barranquero  <lekktu@gmail.com>
+
+        * makefile.w32-in (BLOCKINPUT_H): Remove.
+        (SYSSIGNAL_H): New macro.
+        ($(BLD)/alloc.$(O), $(BLD)/atimer.$(O), $(BLD)/buffer.$(O))
+        ($(BLD)/callproc.$(O), $(BLD)/data.$(O), $(BLD)/dired.$(O))
+        ($(BLD)/dispnew.$(O), $(BLD)/editfns.$(O), $(BLD)/emacs.$(O))
+        ($(BLD)/eval.$(O), $(BLD)/fileio.$(O), $(BLD)/floatfns.$(O))
+        ($(BLD)/fns.$(O), $(BLD)/fontset.$(O), $(BLD)/frame.$(O))
+        ($(BLD)/fringe.$(O), $(BLD)/image.$(O), $(BLD)/insdel.$(O))
+        ($(BLD)/keyboard.$(O), $(BLD)/keymap.$(O), $(BLD)/lread.$(O))
+        ($(BLD)/menu.$(O), $(BLD)/w32inevt.$(O), $(BLD)/w32proc.$(O))
+        ($(BLD)/print.$(O), $(BLD)/process.$(O), $(BLD)/ralloc.$(O))
+        ($(BLD)/search.$(O), $(BLD)/sound.$(O), $(BLD)/sysdep.$(O))
+        ($(BLD)/term.$(O), $(BLD)/window.$(O), $(BLD)/xdisp.$(O))
+        ($(BLD)/xfaces.$(O), $(BLD)/w32fns.$(O), $(BLD)/w32menu.$(O))
+        ($(BLD)/w32term.$(O), $(BLD)/w32select.$(O), $(BLD)/w32reg.$(O))
+        ($(BLD)/w32xfns.$(O)): Update dependencies.
+
+2012-09-23  Eli Zaretskii  <eliz@gnu.org>
+
+        * .gdbinit: Set breakpoint on terminate_due_to_signal, not on
+        fatal_error_backtrace.
+
+        * w32proc.c (sys_kill): Undo last change: don't do anything when
+        invoked to deliver SIGABRT to our own process.  This is now
+        handled by emacs_raise.
+
+2012-09-23  Juanma Barranquero  <lekktu@gmail.com>
+
+        * w32term.c (w32_read_socket): Remove leftover reference to
+        interrupt_input_pending.
+
+2012-09-23  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Do not use SA_NODEFER.
+        Problem reported by Dani Moncayo in
+        <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00557.html>.
+        * alloc.c (die):
+        * sysdep.c (emacs_abort): Do not reset signal handler.
+        * emacs.c (terminate_due_to_signal): Reset signal handler here.
+        * sysdep.c (init_signals): Do not use SA_NODEFER.  It wasn't
+        wanted even on POSIXish hosts, and it doesn't work on Windows.
+
+2012-09-23  Jan Djärv  <jan.h.d@swipnet.se>
+
+        * xterm.c (x_term_init): Call fixup_locale before and after calling
+        gtk_init (Bug#12392).
+
+2012-09-23  Chong Yidong  <cyd@gnu.org>
+
+        * w32.c (w32_delayed_load): Remove LIBRARIES argument; always use
+        Vdynamic_library_alist.
+
+        * gnutls.c (init_gnutls_functions): Caller changed; remove arg.
+        (Fgnutls_available_p): Caller changed.
+
+        * xml.c (init_libxml2_functions, Flibxml_parse_html_region)
+        (Flibxml_parse_xml_region): Likewise.
+
+        * dispextern.h (struct image_type): Remove arg from init function.
+
+        * image.c (Finit_image_library, lookup_image_type)
+        (define_image_type): Remove now-unneeded second arg.
+        (init_xpm_functions, init_png_functions, init_jpeg_functions)
+        (init_tiff_functions, init_gif_functions, init_svg_functions):
+        Arglist and w32_delayed_load calling convention changed.
+        (gs_type): Remove init_gs_functions; there is no such function.
+        (valid_image_p, make_image): Fix caller to lookup_image_type.
+
+2012-09-23  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Simplify and avoid signal-handling races (Bug#12471).
+        * alloc.c (die):
+        * sysdep.c (emacs_abort) [HAVE_NTGUI]:
+        Avoid recursive loop if there's a fatal error in the function itself.
+        * atimer.c (pending_atimers):
+        * blockinput.h: Don't include "atimer.h"; no longer needed.
+        (interrupt_input_pending): Remove.  All uses removed.
+        pending_signals now counts both atimers and ordinary interrupts.
+        This is less racy than having three separate pending-signal flags.
+        (block_input, unblock_input, totally_unblock_input, unblock_input_to)
+        (input_blocked_p):
+        Rename from their upper-case counterparts BLOCK_INPUT,
+        UNBLOCK_INPUT, TOTALLY_UNBLOCK_INPUT, UNBLOCK_INPUT_TO,
+        INPUT_BLOCKED_P, and turn into functions.  All uses changed.
+        This makes it easier to access volatile variables more accurately.
+        (BLOCK_INPUT_RESIGNAL): Remove.  All uses replaced by unblock_input ().
+        (input_blocked_p): Prefer this to 'interrupt_input_blocked', as
+        that's more reliable if the code is buggy and sets
+        interrupt_input_blocked to a negative value.  All uses changed.
+        * atimer.c (deliver_alarm_signal):
+        Remove.  No need to deliver this to the parent; any thread can
+        handle this signal now.  All uses replaced by underlying handler.
+        * atimer.c (turn_on_atimers):
+        * dispnew.c (handle_window_change_signal):
+        * emacs.c (handle_danger_signal):
+        * keyboard.c (kbd_buffer_get_event):
+        Don't reestablish signal handler; not needed with sigaction.
+        * blockinput.h (UNBLOCK_INPUT_TO, TOTALLY_UNBLOCK_INPUT)
+        (UNBLOCK_INPUT_TO):
+        Rework to avoid unnecessary accesses to volatile variables.
+        (UNBLOCK_INPUT_TO): Now a function.
+        (totally_unblock_input, unblock_input): New decls.
+        * data.c (handle_arith_signal, deliver_arith_signal): Move to sysdep.c
+        (init_data): Remove.  Necessary stuff now done in init_signal.
+        * emacs.c, xdisp.c: Include "atimer.h", since we invoke atimer functions.
+        * emacs.c (handle_fatal_signal, deliver_fatal_signal): Move to sysdep.c.
+        (fatal_error_code): Remove; no longer needed.
+        (terminate_due_to_signal): Rename from fatal_error_backtrace, since
+        it doesn't always backtrace.  All uses changed.  No need to reset
+        signal to default, since sigaction and/or die does that for us now.
+        Use emacs_raise (FOO), not kill (getpid (), FOO).
+        (main): Check more-accurately whether we're dumping.
+        Move fatal-error setup to sysdep.c
+        * floatfns.c: Do not include "syssignal.h"; no longer needed.
+        * gtkutil.c (xg_get_file_name, xg_get_font):
+        Remove no-longer-needed signal-mask manipulation.
+        * keyboard.c, process.c (POLL_FOR_INPUT):
+        Don't depend on USE_ASYNC_EVENTS, a symbol that is never defined.
+        * keyboard.c (read_avail_input): Remove.
+        All uses replaced by gobble_input.
+        (Ftop_level): Use TOTALLY_UNBLOCK_INPUT rather than open code.
+        (kbd_buffer_store_event_hold, gobble_input):
+        (record_asynch_buffer_change) [USABLE_SIGIO]:
+        (store_user_signal_events):
+        No need to mess with signal mask.
+        (gobble_input): If blocking input and there are terminals, simply
+        set pending_signals to 1 and return.  All hooks changed to not
+        worry about whether input is blocked.
+        (process_pending_signals): Clear pending_signals before processing
+        them, in case a signal comes in while we're processing.
+        By convention callers now test pending_signals before calling us.
+        (UNBLOCK_INPUT_TO, unblock_input, totally_unblock_input):
+        New functions, to support changes to blockinput.h.
+        (handle_input_available_signal): Now extern.
+        (reinvoke_input_signal): Remove.  All uses replaced by
+        handle_async_input.
+        (quit_count): Now volatile, since a signal handler uses it.
+        (handle_interrupt): Now takes bool IN_SIGNAL_HANDLER as arg.
+        All callers changed.  Block SIGINT only if not already blocked.
+        Clear sigmask reliably, even if Fsignal returns, which it can.
+        Omit unnecessary accesses to volatile var.
+        (quit_throw_to_read_char): No need to restore sigmask.
+        * keyboard.c (gobble_input, handle_user_signal):
+        * process.c (wait_reading_process_output):
+        Call signal-handling code rather than killing ourselves.
+        * lisp.h: Include <float.h>, for...
+        (IEEE_FLOATING_POINT): New macro, moved here to avoid duplication.
+        (pending_signals): Now volatile.
+        (syms_of_data): Now const if IEEE floating point.
+        (handle_input_available_signal) [USABLE_SIGIO]:
+        (terminate_due_to_signal, record_child_status_change): New decls.
+        * process.c (create_process): Avoid disaster if memory is exhausted
+        while we're processing a vfork, by tightening the critical section
+        around the vfork.
+        (send_process_frame, process_sent_to, handle_pipe_signal)
+        (deliver_pipe_signal): Remove.  No longer needed, as Emacs now
+        ignores SIGPIPE.
+        (send_process): No need for setjmp/longjmp any more, since the
+        SIGPIPE stuff is now gone.  Instead, report an error if errno
+        is EPIPE.
+        (record_child_status_change): Now extern.  PID and W are now args.
+        Return void, not bool.  All callers changed.
+        * sysdep.c (wait_debugging) [(BSD_SYSTEM || HPUX) && !defined (__GNU__)]:
+        Remove.  All uses removed.  This bug should be fixed now in a
+        different way.
+        (wait_for_termination_1): Use waitpid rather than sigsuspend,
+        and record the child status change directly.  This avoids the
+        need to futz with the signal mask.
+        (process_fatal_action): Move here from emacs.c.
+        (emacs_sigaction_flags): New function, containing
+        much of what used to be in emacs_sigaction_init.
+        (emacs_sigaction_init): Use it.  Block nonfatal system signals that are
+        caught by emacs, to make races less likely.
+        (deliver_process_signal): Rename from handle_on_main_thread.
+        All uses changed.
+        (BACKTRACE_LIMIT_MAX): Now at top level.
+        (thread_backtrace_buffer, threadback_backtrace_pointers):
+        New static vars.
+        (deliver_thread_signal, deliver_fatal_thread_signal):
+        New functions, for more-accurate delivery of thread-specific signals.
+        (handle_fatal_signal, deliver_fatal_signal): Move here from emacs.c.
+        (deliver_arith_signal): Handle in this thread, not
+        in the main thread, since it's triggered by this thread.
+        (maybe_fatal_sig): New function.
+        (init_signals): New arg DUMPING so that we can be more accurate
+        about whether we're dumping.  Caller changed.
+        Treat thread-specific signals differently from process-general signals.
+        Block all signals while handling fatal error; that's safer.
+        xsignal from SIGFPE only on non-IEEE hosts, treating it as fatal
+        on IEEE hosts.
+        When batch, ignore SIGHUP, SIGINT, SIGTERM if they were already ignored.
+        Ignore SIGPIPE unless batch.
+        (emacs_backtrace): Output backtrace for the appropriate thread,
+        which is not necessarily the main thread.
+        * syssignal.h: Include <stdbool.h>.
+        (emacs_raise): New macro.
+        * xterm.c (x_connection_signal): Remove; no longer needed
+        now that we use sigaction.
+        (x_connection_closed): No need to mess with sigmask now.
+        (x_initialize): No need to reset SIGPIPE handler here, since
+        init_signals does this for us now.
+
+2012-09-23  Jan Djärv  <jan.h.d@swipnet.se>
+
+        * nsterm.m (ns_dumpglyphs_image): dr is a new rect to draw image into,
+        background rect may be larger (Bug#12245).
+
+2012-09-23  Chong Yidong  <cyd@gnu.org>
+
+        * keyboard.c (timer_check): Avoid quitting during Fcopy_sequence.
+
 2012-09-22  Paul Eggert  <eggert@cs.ucla.edu>
 
         * .gdbinit: Just stop at fatal_error_backtrace.
@@ -30,8 +571,8 @@
         if it is defined.  Arguments and return value changed.
         (valid_image_p, make_image): Callers changed.
         (xbm_type, xpm_type, pbm_type, png_type, jpeg_type, tiff_type)
-        (gif_type, imagemagick_type, svg_type, gs_type): Add
-        initialization functions.
+        (gif_type, imagemagick_type, svg_type, gs_type):
+        Add initialization functions.
         (Finit_image_library): Call lookup_image_type.
         (CHECK_LIB_AVAILABLE): Macro deleted.
         (lookup_image_type): Call define_image_type here, rather than via
@@ -53,8 +594,8 @@
         * window.c (Fsplit_window_internal): Handle only Qt value of
         Vwindow_combination_limit separately.
         (Qtemp_buffer_resize): New symbol.
-        (Vwindow_combination_limit): New default value.  Rewrite
-        doc-string.
+        (Vwindow_combination_limit): New default value.
+        Rewrite doc-string.
 
 2012-09-22  Eli Zaretskii  <eliz@gnu.org>
 
@@ -153,7 +694,7 @@
         (Fx_create_frame): Call x_set_offset to correctly interpret
         top_pos in geometry.
 
-        * frame.c (read_integer, XParseGeometry): Moved from w32xfns.c.
+        * frame.c (read_integer, XParseGeometry): Move from w32xfns.c.
         (Fx_parse_geometry): If there is a space in string, call
         Qns_parse_geometry, otherwise do as on other terms (Bug#12368).
 
@@ -254,8 +795,8 @@
 
 2012-09-16  Martin Rudalics  <rudalics@gmx.at>
 
-        * window.c (Fwindow_parameter, Fset_window_parameter): Accept
-        any window as argument (Bug#12452).
+        * window.c (Fwindow_parameter, Fset_window_parameter):
+        Accept any window as argument (Bug#12452).
 
 2012-09-16  Jan Djärv  <jan.h.d@swipnet.se>
 
@@ -330,8 +871,8 @@
 2012-09-14  Dmitry Antipov  <dmantipov@yandex.ru>
 
         Avoid out-of-range marker position (Bug#12426).
-        * insdel.c (replace_range, replace_range_2): Adjust
-        markers before overlays, as suggested by comments.
+        * insdel.c (replace_range, replace_range_2):
+        Adjust markers before overlays, as suggested by comments.
         (insert_1_both, insert_from_buffer_1, adjust_after_replace):
         Remove redundant check before calling offset_intervals.
 
@@ -630,8 +1171,8 @@
         in the internal border.
         (x_set_window_size): Remove static variables and their usage.
         (ns_redraw_scroll_bars): Fix NSTRACE arg.
-        (ns_after_update_window_line, ns_draw_fringe_bitmap): Remove
-        fringe/internal border adjustment (Bug#11052).
+        (ns_after_update_window_line, ns_draw_fringe_bitmap):
+        Remove fringe/internal border adjustment (Bug#11052).
         (ns_draw_fringe_bitmap): Make code more like other terms (xterm.c).
         (ns_draw_window_cursor): Remove fringe/internal border adjustment.
         (ns_fix_rect_ibw): Remove.
@@ -848,8 +1389,8 @@
         (init_signals) [FORWARD_SIGNAL_TO_MAIN_THREAD]: Initialize it;
         code moved here from emacs.c's main function.
         * sysdep.c, syssignal.h (handle_on_main_thread): New function,
-        replacing the old SIGNAL_THREAD_CHECK.  All uses changed.  This
-        lets callers save and restore errno properly.
+        replacing the old SIGNAL_THREAD_CHECK.  All uses changed.
+        This lets callers save and restore errno properly.
 
 2012-09-05  Dmitry Antipov  <dmantipov@yandex.ru>
 
@@ -1158,8 +1699,8 @@
         * process.c: Include TERM_HEADER instead of listing all possible
         window-system headers.
 
-        * nsterm.h: Remove declarations now in frame.h.  Define
-        FRAME_X_SCREEN, FRAME_X_VISUAL.
+        * nsterm.h: Remove declarations now in frame.h.
+        Define FRAME_X_SCREEN, FRAME_X_VISUAL.
 
         * menu.c: Include TERM_HEADER instead of listing all possible
         window-system headers.
@@ -1355,8 +1896,8 @@
 
         * nsterm.h (NSPanel): New class variable dialog_return.
 
-        * nsmenu.m (initWithContentRect:styleMask:backing:defer:): Initialize
-        dialog_return.
+        * nsmenu.m (initWithContentRect:styleMask:backing:defer:):
+        Initialize dialog_return.
         (windowShouldClose:): Use stop instead of stopModalWithCode.
         (clicked:): Ditto, and also set dialog_return (Bug#12258).
         (timeout_handler:): Use stop instead of abortModal.  Send a dummy
diff --git a/src/ChangeLog.11 b/src/ChangeLog.11
index d3b0a8284b5..1f444b9292c 100644
--- a/src/ChangeLog.11
+++ b/src/ChangeLog.11
@@ -5532,7 +5532,7 @@
         (update_frame_tool_bar): Remove old_req, new_req.  Do not get tool bar
         height, call xg_update_tool_bar_sizes instead.
         (free_frame_tool_bar): Remove from hbox or vbox depending on
-        toolbar_in_hbox,  Set all FRAME_TOOLBAR_*_(WIDTH|HEIGHT) to zero.
+        toolbar_in_hbox.  Set all FRAME_TOOLBAR_*_(WIDTH|HEIGHT) to zero.
         (xg_change_toolbar_position): New function.
 
         * frame.h (struct frame): Add tool_bar_position.
diff --git a/src/ChangeLog.2 b/src/ChangeLog.2
index 1a9728f6896..0806106836e 100644
--- a/src/ChangeLog.2
+++ b/src/ChangeLog.2
@@ -2680,7 +2680,7 @@
 
 1986-12-11  Richard Mlynarik  (mly@prep)
 
-        * emacs.c,  dispnew.c:
+        * emacs.c, dispnew.c:
         Rename inhibit_x_windows inhibit_window_system.
         Understand "-nw" command-line option.
         Reorganize init_display a little to make other window-system
diff --git a/src/ChangeLog.3 b/src/ChangeLog.3
index 6c580fe4b52..4f6e02ff8d3 100644
--- a/src/ChangeLog.3
+++ b/src/ChangeLog.3
@@ -11154,7 +11154,7 @@
         (classify_object): Removed code to look up a function key in the
         global and local function key keymaps, since this will be done
         more generally.
-        (Fexecute_mouse_event): Elided this function with a #if 0;  I
+        (Fexecute_mouse_event): Elided this function with a #if 0; I
         think it will go away once the more general keymap stuff is
         implemented, but I'm not sure.
         (syms_of_keyboard): Removed defsubr for Sexecute_mouse_event.
diff --git a/src/Makefile.in b/src/Makefile.in
index 37da170edbd..f8da0091711 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -153,6 +153,7 @@ M17N_FLT_CFLAGS = @M17N_FLT_CFLAGS@
 M17N_FLT_LIBS = @M17N_FLT_LIBS@
 
 LIB_CLOCK_GETTIME=@LIB_CLOCK_GETTIME@
+LIB_TIMER_TIME=@LIB_TIMER_TIME@
 
 DBUS_CFLAGS = @DBUS_CFLAGS@
 DBUS_LIBS = @DBUS_LIBS@
@@ -339,6 +340,7 @@ base_obj = dispnew.o frame.o scroll.o xdisp.o menu.o $(XMENU_OBJ) window.o \
         process.o gnutls.o callproc.o \
         region-cache.o sound.o atimer.o \
         doprnt.o intervals.o textprop.o composite.o xml.o \
+        profiler.o \
         $(MSDOS_OBJ) $(MSDOS_X_OBJ) $(NS_OBJ) $(CYGWIN_OBJ) $(FONT_OBJ) \
         $(WINDOW_SYSTEM_OBJ)
 obj = $(base_obj) $(NS_OBJC_OBJ)
@@ -384,8 +386,8 @@ otherobj= $(TERMCAP_OBJ) $(PRE_ALLOC_OBJ) $(GMALLOC_OBJ) $(RALLOC_OBJ) \
 ## duplicated symbols.  If the standard libraries were compiled
 ## with GCC, we might need LIB_GCC again after them.
 LIBES = $(LIBS) $(LIBX_BASE) $(LIBX_OTHER) $(LIBSOUND) \
-   $(RSVG_LIBS) $(IMAGEMAGICK_LIBS) $(LIB_CLOCK_GETTIME) $(DBUS_LIBS) \
-   $(LIB_EXECINFO) \
+   $(RSVG_LIBS) $(IMAGEMAGICK_LIBS) $(LIB_CLOCK_GETTIME) $(LIB_TIMER_TIME) \
+   $(DBUS_LIBS) $(LIB_EXECINFO) \
    $(LIBXML2_LIBS) $(LIBGPM) $(LIBRESOLV) $(LIBS_SYSTEM) \
    $(LIBS_TERMCAP) $(GETLOADAVG_LIBS) $(SETTINGS_LIBS) $(LIBSELINUX_LIBS) \
    $(FREETYPE_LIBS) $(FONTCONFIG_LIBS) $(LIBOTF_LIBS) $(M17N_FLT_LIBS) \
diff --git a/src/alloc.c b/src/alloc.c
index 02ba2f5f9e3..df166b4924a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -205,6 +205,7 @@ static Lisp_Object Qintervals;
 static Lisp_Object Qbuffers;
 static Lisp_Object Qstring_bytes, Qvector_slots, Qheap;
 static Lisp_Object Qgc_cons_threshold;
+Lisp_Object Qautomatic_gc;
 Lisp_Object Qchar_table_extra_slots;
 
 /* Hook run after GC has finished.  */
@@ -633,13 +634,13 @@ static void
 malloc_block_input (void)
 {
   if (block_input_in_memory_allocators)
-    BLOCK_INPUT;
+    block_input ();
 }
 static void
 malloc_unblock_input (void)
 {
   if (block_input_in_memory_allocators)
-    UNBLOCK_INPUT;
+    unblock_input ();
 }
 # define MALLOC_BLOCK_INPUT malloc_block_input ()
 # define MALLOC_UNBLOCK_INPUT malloc_unblock_input ()
@@ -648,6 +649,13 @@ malloc_unblock_input (void)
 # define MALLOC_UNBLOCK_INPUT ((void) 0)
 #endif
 
+#define MALLOC_PROBE(size)                      \
+  do {                                          \
+    if (profiler_memory_running)                \
+      malloc_probe (size);                      \
+  } while (0)
+
+
 /* Like malloc but check for no memory and block interrupt input..  */
 
 void *
@@ -661,6 +669,7 @@ xmalloc (size_t size)
 
   if (!val && size)
     memory_full (size);
+  MALLOC_PROBE (size);
   return val;
 }
 
@@ -678,6 +687,7 @@ xzalloc (size_t size)
   if (!val && size)
     memory_full (size);
   memset (val, 0, size);
+  MALLOC_PROBE (size);
   return val;
 }
 
@@ -699,6 +709,7 @@ xrealloc (void *block, size_t size)
 
   if (!val && size)
     memory_full (size);
+  MALLOC_PROBE (size);
   return val;
 }
 
@@ -888,6 +899,7 @@ lisp_malloc (size_t nbytes, enum mem_type type)
   MALLOC_UNBLOCK_INPUT;
   if (!val && nbytes)
     memory_full (nbytes);
+  MALLOC_PROBE (nbytes);
   return val;
 }
 
@@ -1093,6 +1105,8 @@ lisp_align_malloc (size_t nbytes, enum mem_type type)
 
   MALLOC_UNBLOCK_INPUT;
 
+  MALLOC_PROBE (nbytes);
+
   eassert (0 == ((uintptr_t) val) % BLOCK_ALIGN);
   return val;
 }
@@ -5043,6 +5057,23 @@ bounded_number (EMACS_INT number)
   return make_number (min (MOST_POSITIVE_FIXNUM, number));
 }
 
+/* Calculate total bytes of live objects.  */
+
+static size_t
+total_bytes_of_live_objects (void)
+{
+  size_t tot = 0;
+  tot += total_conses  * sizeof (struct Lisp_Cons);
+  tot += total_symbols * sizeof (struct Lisp_Symbol);
+  tot += total_markers * sizeof (union Lisp_Misc);
+  tot += total_string_bytes;
+  tot += total_vector_slots * word_size;
+  tot += total_floats  * sizeof (struct Lisp_Float);
+  tot += total_intervals * sizeof (struct interval);
+  tot += total_strings * sizeof (struct Lisp_String);
+  return tot;
+}
+
 DEFUN ("garbage-collect", Fgarbage_collect, Sgarbage_collect, 0, 0, "",
        doc: /* Reclaim storage for Lisp objects no longer needed.
 Garbage collection happens automatically if you cons more than
@@ -5068,6 +5099,8 @@ See Info node `(elisp)Garbage Collection'.  */)
   ptrdiff_t count = SPECPDL_INDEX ();
   EMACS_TIME start;
   Lisp_Object retval = Qnil;
+  size_t tot_before = 0;
+  struct backtrace backtrace;
 
   if (abort_on_gc)
     emacs_abort ();
@@ -5077,6 +5110,14 @@ See Info node `(elisp)Garbage Collection'.  */)
   if (pure_bytes_used_before_overflow)
     return Qnil;
 
+  /* Record this function, so it appears on the profiler's backtraces.  */
+  backtrace.next = backtrace_list;
+  backtrace.function = Qautomatic_gc;
+  backtrace.args = &Qnil;
+  backtrace.nargs = 0;
+  backtrace.debug_on_exit = 0;
+  backtrace_list = &backtrace;
+
   check_cons_list ();
 
   /* Don't keep undo information around forever.
@@ -5084,6 +5125,9 @@ See Info node `(elisp)Garbage Collection'.  */)
   FOR_EACH_BUFFER (nextb)
     compact_buffer (nextb);
 
+  if (profiler_memory_running)
+    tot_before = total_bytes_of_live_objects ();
+
   start = current_emacs_time ();
 
   /* In case user calls debug_print during GC,
@@ -5125,7 +5169,7 @@ See Info node `(elisp)Garbage Collection'.  */)
   if (garbage_collection_messages)
     message1_nolog ("Garbage collecting...");
 
-  BLOCK_INPUT;
+  block_input ();
 
   shrink_regexp_cache ();
 
@@ -5242,7 +5286,7 @@ See Info node `(elisp)Garbage Collection'.  */)
   dump_zombies ();
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   check_cons_list ();
 
@@ -5255,16 +5299,7 @@ See Info node `(elisp)Garbage Collection'.  */)
   gc_relative_threshold = 0;
   if (FLOATP (Vgc_cons_percentage))
     { /* Set gc_cons_combined_threshold.  */
-      double tot = 0;
-
-      tot += total_conses  * sizeof (struct Lisp_Cons);
-      tot += total_symbols * sizeof (struct Lisp_Symbol);
-      tot += total_markers * sizeof (union Lisp_Misc);
-      tot += total_string_bytes;
-      tot += total_vector_slots * word_size;
-      tot += total_floats  * sizeof (struct Lisp_Float);
-      tot += total_intervals * sizeof (struct interval);
-      tot += total_strings * sizeof (struct Lisp_String);
+      double tot = total_bytes_of_live_objects ();
 
       tot *= XFLOAT_DATA (Vgc_cons_percentage);
       if (0 < tot)
@@ -5367,6 +5402,17 @@ See Info node `(elisp)Garbage Collection'.  */)
 
   gcs_done++;
 
+  /* Collect profiling data.  */
+  if (profiler_memory_running)
+    {
+      size_t swept = 0;
+      size_t tot_after = total_bytes_of_live_objects ();
+      if (tot_before > tot_after)
+        swept = tot_before - tot_after;
+      malloc_probe (swept);
+    }
+
+  backtrace_list = backtrace.next;
   return retval;
 }
 
@@ -6395,7 +6441,7 @@ die (const char *msg, const char *file, int line)
 {
   fprintf (stderr, "\r\n%s:%d: Emacs fatal error: %s\r\n",
            file, line, msg);
-  fatal_error_backtrace (SIGABRT, INT_MAX);
+  terminate_due_to_signal (SIGABRT, INT_MAX);
 }
 #endif
 
@@ -6527,6 +6573,7 @@ do hash-consing of the objects allocated to pure space.  */);
   DEFSYM (Qstring_bytes, "string-bytes");
   DEFSYM (Qvector_slots, "vector-slots");
   DEFSYM (Qheap, "heap");
+  DEFSYM (Qautomatic_gc, "Automatic GC");
 
   DEFSYM (Qgc_cons_threshold, "gc-cons-threshold");
   DEFSYM (Qchar_table_extra_slots, "char-table-extra-slots");
diff --git a/src/atimer.c b/src/atimer.c
index 5dbd807872a..048c62798ef 100644
--- a/src/atimer.c
+++ b/src/atimer.c
@@ -40,13 +40,12 @@ static struct atimer *stopped_atimers;
 
 static struct atimer *atimers;
 
-/* Non-zero means alarm signal handler has found ripe timers but
-   interrupt_input_blocked was non-zero.  In this case, timer
-   functions are not called until the next UNBLOCK_INPUT because timer
-   functions are expected to call X, and X cannot be assumed to be
-   reentrant.  */
-
-int pending_atimers;
+/* The alarm timer and whether it was properly initialized, if
+   POSIX timers are available.  */
+#ifdef HAVE_TIMER_SETTIME
+static timer_t alarm_timer;
+static bool alarm_timer_ok;
+#endif
 
 /* Block/unblock SIGALRM.  */
 
@@ -295,14 +294,25 @@ set_alarm (void)
 #ifdef HAVE_SETITIMER
       struct itimerval it;
 #endif
+      EMACS_TIME now, interval;
 
-      /* Determine s/us till the next timer is ripe.  */
-      EMACS_TIME now = current_emacs_time ();
+#ifdef HAVE_TIMER_SETTIME
+      if (alarm_timer_ok)
+        {
+          struct itimerspec ispec;
+          ispec.it_value = atimers->expiration;
+          ispec.it_interval.tv_sec = ispec.it_interval.tv_nsec = 0;
+          if (timer_settime (alarm_timer, 0, &ispec, 0) == 0)
+            return;
+        }
+#endif
 
-      /* Don't set the interval to 0; this disables the timer.  */
-      EMACS_TIME interval = (EMACS_TIME_LE (atimers->expiration, now)
-                             ? make_emacs_time (0, 1000 * 1000)
-                             : sub_emacs_time (atimers->expiration, now));
+      /* Determine interval till the next timer is ripe.
+         Don't set the interval to 0; this disables the timer.  */
+      now = current_emacs_time ();
+      interval = (EMACS_TIME_LE (atimers->expiration, now)
+                  ? make_emacs_time (0, 1000 * 1000)
+                  : sub_emacs_time (atimers->expiration, now));
 
 #ifdef HAVE_SETITIMER
 
@@ -341,16 +351,11 @@ schedule_atimer (struct atimer *t)
 static void
 run_timers (void)
 {
-  EMACS_TIME now;
+  EMACS_TIME now = current_emacs_time ();
 
-  while (atimers
-         && (pending_atimers = interrupt_input_blocked) == 0
-         && (now = current_emacs_time (),
-             EMACS_TIME_LE (atimers->expiration, now)))
+  while (atimers && EMACS_TIME_LE (atimers->expiration, now))
     {
-      struct atimer *t;
-
-      t = atimers;
+      struct atimer *t = atimers;
       atimers = atimers->next;
       t->fn (t);
 
@@ -366,16 +371,7 @@ run_timers (void)
         }
     }
 
-  if (! atimers)
-    pending_atimers = 0;
-
-  if (pending_atimers)
-    pending_signals = 1;
-  else
-    {
-      pending_signals = interrupt_input_pending;
-      set_alarm ();
-    }
+  set_alarm ();
 }
 
 
@@ -385,23 +381,16 @@ run_timers (void)
 static void
 handle_alarm_signal (int sig)
 {
-  pending_atimers = 1;
   pending_signals = 1;
 }
 
-static void
-deliver_alarm_signal (int sig)
-{
-  handle_on_main_thread (sig, handle_alarm_signal);
-}
-
 
-/* Call alarm signal handler for pending timers.  */
+/* Do pending timers.  */
 
 void
 do_pending_atimers (void)
 {
-  if (pending_atimers)
+  if (atimers)
     {
       block_atimers ();
       run_timers ();
@@ -417,12 +406,7 @@ void
 turn_on_atimers (bool on)
 {
   if (on)
-    {
-      struct sigaction action;
-      emacs_sigaction_init (&action, deliver_alarm_signal);
-      sigaction (SIGALRM, &action, 0);
-      set_alarm ();
-    }
+    set_alarm ();
   else
     alarm (0);
 }
@@ -432,9 +416,15 @@ void
 init_atimer (void)
 {
   struct sigaction action;
+#ifdef HAVE_TIMER_SETTIME
+  struct sigevent sigev;
+  sigev.sigev_notify = SIGEV_SIGNAL;
+  sigev.sigev_signo = SIGALRM;
+  sigev.sigev_value.sival_ptr = &alarm_timer;
+  alarm_timer_ok = timer_create (CLOCK_REALTIME, &sigev, &alarm_timer) == 0;
+#endif
   free_atimers = stopped_atimers = atimers = NULL;
-  pending_atimers = 0;
   /* pending_signals is initialized in init_keyboard.*/
-  emacs_sigaction_init (&action, deliver_alarm_signal);
+  emacs_sigaction_init (&action, handle_alarm_signal);
   sigaction (SIGALRM, &action, 0);
 }
diff --git a/src/blockinput.h b/src/blockinput.h
index 7501bfc91a0..70822e29be7 100644
--- a/src/blockinput.h
+++ b/src/blockinput.h
@@ -19,103 +19,57 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifndef EMACS_BLOCKINPUT_H
 #define EMACS_BLOCKINPUT_H
 
-#include "atimer.h"
+INLINE_HEADER_BEGIN
+#ifndef BLOCKINPUT_INLINE
+# define BLOCKINPUT_INLINE INLINE
+#endif
 
-/* When Emacs is using signal-driven input, the processing of those
-   input signals can get pretty hairy.  For example, when Emacs is
-   running under X windows, handling an input signal can entail
-   retrieving events from the X event queue, or making other X calls.
-
-   If an input signal occurs while Emacs is in the midst of some
-   non-reentrant code, and the signal processing invokes that same
-   code, we lose.  For example, malloc and the Xlib functions aren't
-   usually re-entrant, and both are used by the X input signal handler
-   - if we try to process an input signal in the midst of executing
-   any of these functions, we'll lose.
+/* Emacs should avoid doing anything hairy in a signal handler, because
+   so many system functions are non-reentrant.  For example, malloc
+   and the Xlib functions aren't usually re-entrant, so if they were
+   used by the SIGIO handler, we'd lose.
 
    To avoid this, we make the following requirements:
 
-   * Everyone must evaluate BLOCK_INPUT before entering these functions,
-   and then call UNBLOCK_INPUT after performing them.  Calls
-   BLOCK_INPUT and UNBLOCK_INPUT may be nested.
+   * Everyone must evaluate BLOCK_INPUT before performing actions that
+   might conflict with a signal handler, and then call UNBLOCK_INPUT
+   after performing them.  Calls BLOCK_INPUT and UNBLOCK_INPUT may be
+   nested.
 
    * Any complicated interrupt handling code should test
-   interrupt_input_blocked, and put off its work until later.
+   INPUT_BLOCKED_P, and put off its work until later.
 
    * If the interrupt handling code wishes, it may set
-   interrupt_input_pending to a non-zero value.  If that flag is set
-   when input becomes unblocked, UNBLOCK_INPUT will send a new SIGIO.  */
-
-extern volatile int interrupt_input_blocked;
-
-/* Nonzero means an input interrupt has arrived
-   during the current critical section.  */
-extern int interrupt_input_pending;
+   pending_signals to a non-zero value.  If that flag is set
+   when input becomes unblocked, UNBLOCK_INPUT will then read
+   input and process timers.
 
+   Historically, Emacs signal handlers did much more than they do now,
+   and this caused many BLOCK_INPUT calls to be sprinkled around the code.
+   FIXME: Remove calls that aren't needed now.  */
 
-/* Non-zero means asynchronous timers should be run when input is
-   unblocked.  */
+extern volatile int interrupt_input_blocked;
 
-extern int pending_atimers;
+/* Begin critical section. */
 
+BLOCKINPUT_INLINE void
+block_input (void)
+{
+  interrupt_input_blocked++;
+}
 
-/* Begin critical section. */
-#define BLOCK_INPUT (interrupt_input_blocked++)
-
-/* End critical section.
-
-   If doing signal-driven input, and a signal came in when input was
-   blocked, reinvoke the signal handler now to deal with it.
-
-   Always test interrupt_input_pending; that's not too expensive, and
-   it'll never get set if we don't need to resignal.  This is simpler
-   than dealing here with every configuration option that might affect
-   whether interrupt_input_pending can be nonzero.  */
-
-#define UNBLOCK_INPUT                           \
-  do                                            \
-    {                                           \
-      --interrupt_input_blocked;                \
-      if (interrupt_input_blocked == 0)         \
-        {                                       \
-          if (interrupt_input_pending)          \
-            reinvoke_input_signal ();           \
-          if (pending_atimers)                  \
-            do_pending_atimers ();              \
-        }                                       \
-      else if (interrupt_input_blocked < 0)     \
-        emacs_abort ();                         \
-    }                                           \
-  while (0)
-
-/* Undo any number of BLOCK_INPUT calls,
-   and also reinvoke any pending signal.  */
-
-#define TOTALLY_UNBLOCK_INPUT                   \
-  do if (interrupt_input_blocked != 0)          \
-    {                                           \
-      interrupt_input_blocked = 1;              \
-      UNBLOCK_INPUT;                            \
-    }                                           \
-  while (0)
-
-/* Undo any number of BLOCK_INPUT calls down to level LEVEL,
-   and also (if the level is now 0) reinvoke any pending signal.  */
-
-#define UNBLOCK_INPUT_TO(LEVEL)                         \
-  do                                                    \
-    {                                                   \
-      interrupt_input_blocked = (LEVEL) + 1;            \
-      UNBLOCK_INPUT;                                    \
-    }                                                   \
-  while (0)
-
-#define UNBLOCK_INPUT_RESIGNAL UNBLOCK_INPUT
+extern void unblock_input (void);
+extern void totally_unblock_input (void);
+extern void unblock_input_to (int);
 
 /* In critical section ? */
-#define INPUT_BLOCKED_P (interrupt_input_blocked > 0)
 
-/* Defined in keyboard.c */
-extern void reinvoke_input_signal (void);
+BLOCKINPUT_INLINE bool
+input_blocked_p (void)
+{
+  return 0 < interrupt_input_blocked;
+}
+
+INLINE_HEADER_END
 
 #endif /* EMACS_BLOCKINPUT_H */
diff --git a/src/buffer.c b/src/buffer.c
index 22624e33a4b..356a308fce6 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -550,11 +550,11 @@ even if it is dead.  The return value is never nil.  */)
   b->indirections = 0;
 
   BUF_GAP_SIZE (b) = 20;
-  BLOCK_INPUT;
+  block_input ();
   /* We allocate extra 1-byte at the tail and keep it always '\0' for
      anchoring a search.  */
   alloc_buffer_text (b, BUF_GAP_SIZE (b) + 1);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (! BUF_BEG_ADDR (b))
     buffer_memory_full (BUF_GAP_SIZE (b) + 1);
 
@@ -1923,7 +1923,7 @@ cleaning up all windows currently displaying the buffer to be killed. */)
 
   bset_name (b, Qnil);
 
-  BLOCK_INPUT;
+  block_input ();
   if (b->base_buffer)
     {
       /* Notify our base buffer that we don't share the text anymore.  */
@@ -1946,7 +1946,7 @@ cleaning up all windows currently displaying the buffer to be killed. */)
       b->width_run_cache = 0;
     }
   bset_width_table (b, Qnil);
-  UNBLOCK_INPUT;
+  unblock_input ();
   bset_undo_list (b, Qnil);
 
   /* Run buffer-list-update-hook.  */
@@ -5032,7 +5032,7 @@ alloc_buffer_text (struct buffer *b, ptrdiff_t nbytes)
 {
   void *p;
 
-  BLOCK_INPUT;
+  block_input ();
 #if defined USE_MMAP_FOR_BUFFERS
   p = mmap_alloc ((void **) &b->text->beg, nbytes);
 #elif defined REL_ALLOC
@@ -5043,12 +5043,12 @@ alloc_buffer_text (struct buffer *b, ptrdiff_t nbytes)
 
   if (p == NULL)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       memory_full (nbytes);
     }
 
   b->text->beg = (unsigned char *) p;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Enlarge buffer B's text buffer by DELTA bytes.  DELTA < 0 means
@@ -5060,7 +5060,7 @@ enlarge_buffer_text (struct buffer *b, ptrdiff_t delta)
   void *p;
   ptrdiff_t nbytes = (BUF_Z_BYTE (b) - BUF_BEG_BYTE (b) + BUF_GAP_SIZE (b) + 1
                       + delta);
-  BLOCK_INPUT;
+  block_input ();
 #if defined USE_MMAP_FOR_BUFFERS
   p = mmap_realloc ((void **) &b->text->beg, nbytes);
 #elif defined REL_ALLOC
@@ -5071,12 +5071,12 @@ enlarge_buffer_text (struct buffer *b, ptrdiff_t delta)
 
   if (p == NULL)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       memory_full (nbytes);
     }
 
   BUF_BEG_ADDR (b) = (unsigned char *) p;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5085,7 +5085,7 @@ enlarge_buffer_text (struct buffer *b, ptrdiff_t delta)
 static void
 free_buffer_text (struct buffer *b)
 {
-  BLOCK_INPUT;
+  block_input ();
 
 #if defined USE_MMAP_FOR_BUFFERS
   mmap_free ((void **) &b->text->beg);
@@ -5096,7 +5096,7 @@ free_buffer_text (struct buffer *b)
 #endif
 
   BUF_BEG_ADDR (b) = NULL;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
diff --git a/src/bytecode.c b/src/bytecode.c
index 5f4fdcc5eff..648813aed86 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -1876,7 +1876,7 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
           /* Actually this is Bstack_ref with offset 0, but we use Bdup
              for that instead.  */
           /* CASE (Bstack_ref): */
-          emacs_abort ();
+          error ("Invalid byte opcode");
 
           /* Handy byte-codes for lexical binding.  */
         CASE (Bstack_ref1):
diff --git a/src/callproc.c b/src/callproc.c
index 2604d295f3e..b33882e54c2 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -51,6 +51,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "process.h"
 #include "syssignal.h"
 #include "systty.h"
+#include "syswait.h"
 #include "blockinput.h"
 #include "frame.h"
 #include "termhooks.h"
@@ -582,7 +583,7 @@ usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS)  */)
                        0, current_dir);
 #else  /* not WINDOWSNT */
 
-    BLOCK_INPUT;
+    block_input ();
 
     /* vfork, and prevent local vars from being clobbered by the vfork.  */
     {
@@ -626,15 +627,14 @@ usage: (call-process PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS)  */)
         setpgrp (pid, pid);
 #endif /* USG */
 
-        /* GConf causes us to ignore SIGPIPE, make sure it is restored
-           in the child.  */
+        /* Emacs ignores SIGPIPE, but the child should not.  */
         signal (SIGPIPE, SIG_DFL);
 
         child_setup (filefd, fd1, fd_error, (char **) new_argv,
                      0, current_dir);
       }
 
-    UNBLOCK_INPUT;
+    unblock_input ();
 
 #endif /* not WINDOWSNT */
 
@@ -976,9 +976,9 @@ usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &r
     {
       int fd;
 
-      BLOCK_INPUT;
+      block_input ();
       fd = mkstemp (tempfile);
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (fd == -1)
         report_file_error ("Failed to open temporary file",
                            Fcons (build_string (tempfile), Qnil));
diff --git a/src/character.c b/src/character.c
index def1ad090fd..5808d48a235 100644
--- a/src/character.c
+++ b/src/character.c
@@ -126,8 +126,6 @@ char_string (unsigned int c, unsigned char *p)
       c &= ~CHAR_MODIFIER_MASK;
     }
 
-  MAYBE_UNIFY_CHAR (c);
-
   if (c <= MAX_3_BYTE_CHAR)
     {
       bytes = CHAR_STRING (c, p);
@@ -195,8 +193,6 @@ string_char (const unsigned char *p, const unsigned char **advanced, int *len)
       p += 5;
     }
 
-  MAYBE_UNIFY_CHAR (c);
-
   if (len)
     *len = p - saved_p;
   if (advanced)
diff --git a/src/character.h b/src/character.h
index 70d4e67a978..b2cdcb76699 100644
--- a/src/character.h
+++ b/src/character.h
@@ -554,23 +554,6 @@ INLINE_HEADER_BEGIN
   } while (0)
 
 
-/* If C is a character to be unified with a Unicode character, return
-   the unified Unicode character.  */
-
-#define MAYBE_UNIFY_CHAR(c)                             \
-  do {                                                  \
-    if (c > MAX_UNICODE_CHAR && c <= MAX_5_BYTE_CHAR)   \
-      {                                                 \
-        Lisp_Object val;                                \
-        val = CHAR_TABLE_REF (Vchar_unify_table, c);    \
-        if (INTEGERP (val))                             \
-          c = XFASTINT (val);                           \
-        else if (! NILP (val))                          \
-          c = maybe_unify_char (c, val);                \
-      }                                                 \
-  } while (0)
-
-
 /* Return a non-outlandish value for the tab width.  */
 
 #define SANE_TAB_WIDTH(buf) \
diff --git a/src/charset.c b/src/charset.c
index d8c38e5ea3b..b0915ffde9c 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1617,7 +1617,7 @@ only `ascii', `eight-bit-control', and `eight-bit-graphic'. */)
 /* Return a unified character code for C (>= 0x110000).  VAL is a
    value of Vchar_unify_table for C; i.e. it is nil, an integer, or a
    charset symbol.  */
-int
+static int
 maybe_unify_char (int c, Lisp_Object val)
 {
   struct charset *charset;
@@ -1723,8 +1723,12 @@ decode_char (struct charset *charset, unsigned int code)
         {
           c = char_index + CHARSET_CODE_OFFSET (charset);
           if (CHARSET_UNIFIED_P (charset)
-              && c > MAX_UNICODE_CHAR)
-            MAYBE_UNIFY_CHAR (c);
+              && MAX_UNICODE_CHAR < c && c <= MAX_5_BYTE_CHAR)
+            {
+              /* Unify C with a Unicode character if possible.  */
+              Lisp_Object val = CHAR_TABLE_REF (Vchar_unify_table, c);
+              c = maybe_unify_char (c, val);
+            }
         }
     }
 
diff --git a/src/charset.h b/src/charset.h
index 50d230489fe..b5fa36290c8 100644
--- a/src/charset.h
+++ b/src/charset.h
@@ -538,7 +538,6 @@ extern int charset_unibyte;
 extern struct charset *char_charset (int, Lisp_Object, unsigned *);
 extern Lisp_Object charset_attributes (int);
 
-extern int maybe_unify_char (int, Lisp_Object);
 extern int decode_char (struct charset *, unsigned);
 extern unsigned encode_char (struct charset *, int);
 extern int string_xstring_p (Lisp_Object);
diff --git a/src/chartab.c b/src/chartab.c
index e864514e336..7430235b4af 100644
--- a/src/chartab.c
+++ b/src/chartab.c
@@ -655,15 +655,6 @@ or a character code.  Return VALUE.  */)
   return value;
 }
 
-DEFUN ("set-char-table-default", Fset_char_table_default,
-       Sset_char_table_default, 3, 3, 0,
-       doc: /*
-This function is obsolete and has no effect.  */)
-  (Lisp_Object char_table, Lisp_Object ch, Lisp_Object value)
-{
-  return Qnil;
-}
-
 /* Look up the element in TABLE at index CH, and return it as an
    integer.  If the element is not a character, return CH itself.  */
 
@@ -1415,7 +1406,6 @@ syms_of_chartab (void)
   defsubr (&Sset_char_table_extra_slot);
   defsubr (&Schar_table_range);
   defsubr (&Sset_char_table_range);
-  defsubr (&Sset_char_table_default);
   defsubr (&Soptimize_char_table);
   defsubr (&Smap_char_table);
   defsubr (&Sunicode_property_table_internal);
diff --git a/src/coding.c b/src/coding.c
index 40e67b9a6c8..32d300b9923 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -920,65 +920,18 @@ record_conversion_result (struct coding_system *coding,
 
 
 /* Store multibyte form of the character C in P, and advance P to the
-   end of the multibyte form.  This is like CHAR_STRING_ADVANCE but it
-   never calls MAYBE_UNIFY_CHAR.  */
-
-#define CHAR_STRING_ADVANCE_NO_UNIFY(c, p)      \
-  do {                                          \
-    if ((c) <= MAX_1_BYTE_CHAR)                 \
-      *(p)++ = (c);                             \
-    else if ((c) <= MAX_2_BYTE_CHAR)            \
-      *(p)++ = (0xC0 | ((c) >> 6)),             \
-        *(p)++ = (0x80 | ((c) & 0x3F));         \
-    else if ((c) <= MAX_3_BYTE_CHAR)            \
-      *(p)++ = (0xE0 | ((c) >> 12)),            \
-        *(p)++ = (0x80 | (((c) >> 6) & 0x3F)),  \
-        *(p)++ = (0x80 | ((c) & 0x3F));         \
-    else if ((c) <= MAX_4_BYTE_CHAR)            \
-      *(p)++ = (0xF0 | (c >> 18)),              \
-        *(p)++ = (0x80 | ((c >> 12) & 0x3F)),   \
-        *(p)++ = (0x80 | ((c >> 6) & 0x3F)),    \
-        *(p)++ = (0x80 | (c & 0x3F));           \
-    else if ((c) <= MAX_5_BYTE_CHAR)            \
-      *(p)++ = 0xF8,                            \
-        *(p)++ = (0x80 | ((c >> 18) & 0x0F)),   \
-        *(p)++ = (0x80 | ((c >> 12) & 0x3F)),   \
-        *(p)++ = (0x80 | ((c >> 6) & 0x3F)),    \
-        *(p)++ = (0x80 | (c & 0x3F));           \
-    else                                        \
-      (p) += BYTE8_STRING ((c) - 0x3FFF80, p);  \
-  } while (0)
+   end of the multibyte form.  This used to be like CHAR_STRING_ADVANCE
+   without ever calling MAYBE_UNIFY_CHAR, but nowadays we don't call
+   MAYBE_UNIFY_CHAR in CHAR_STRING_ADVANCE.  */
 
+#define CHAR_STRING_ADVANCE_NO_UNIFY(c, p)  CHAR_STRING_ADVANCE(c, p)
 
 /* Return the character code of character whose multibyte form is at
-   P, and advance P to the end of the multibyte form.  This is like
-   STRING_CHAR_ADVANCE, but it never calls MAYBE_UNIFY_CHAR.  */
-
-#define STRING_CHAR_ADVANCE_NO_UNIFY(p)                         \
-  (!((p)[0] & 0x80)                                             \
-   ? *(p)++                                                     \
-   : ! ((p)[0] & 0x20)                                          \
-   ? ((p) += 2,                                                 \
-      ((((p)[-2] & 0x1F) << 6)                                  \
-       | ((p)[-1] & 0x3F)                                       \
-       | ((unsigned char) ((p)[-2]) < 0xC2 ? 0x3FFF80 : 0)))    \
-   : ! ((p)[0] & 0x10)                                          \
-   ? ((p) += 3,                                                 \
-      ((((p)[-3] & 0x0F) << 12)                                 \
-       | (((p)[-2] & 0x3F) << 6)                                \
-       | ((p)[-1] & 0x3F)))                                     \
-   : ! ((p)[0] & 0x08)                                          \
-   ? ((p) += 4,                                                 \
-      ((((p)[-4] & 0xF) << 18)                                  \
-       | (((p)[-3] & 0x3F) << 12)                               \
-       | (((p)[-2] & 0x3F) << 6)                                \
-       | ((p)[-1] & 0x3F)))                                     \
-   : ((p) += 5,                                                 \
-      ((((p)[-4] & 0x3F) << 18)                                 \
-       | (((p)[-3] & 0x3F) << 12)                               \
-       | (((p)[-2] & 0x3F) << 6)                                \
-       | ((p)[-1] & 0x3F))))
+   P, and advance P to the end of the multibyte form.  This used to be
+   like STRING_CHAR_ADVANCE without ever calling MAYBE_UNIFY_CHAR, but
+   nowadays STRING_CHAR_ADVANCE doesn't call MAYBE_UNIFY_CHAR.  */
 
+#define STRING_CHAR_ADVANCE_NO_UNIFY(p) STRING_CHAR_ADVANCE(p)
 
 /* Set coding->source from coding->src_object.  */
 
diff --git a/src/data.c b/src/data.c
index 72d7c8ccf9a..abcdd4dca0d 100644
--- a/src/data.c
+++ b/src/data.c
@@ -34,14 +34,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "font.h"
 #include "keymap.h"
 
-#include <float.h>
-#if (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \
-     && FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128)
-#define IEEE_FLOATING_POINT 1
-#else
-#define IEEE_FLOATING_POINT 0
-#endif
-
 Lisp_Object Qnil, Qt, Qquote, Qlambda, Qunbound;
 static Lisp_Object Qsubr;
 Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
@@ -3179,32 +3171,3 @@ syms_of_data (void)
   Vmost_negative_fixnum = make_number (MOST_NEGATIVE_FIXNUM);
   XSYMBOL (intern_c_string ("most-negative-fixnum"))->constant = 1;
 }
-
-static _Noreturn void
-handle_arith_signal (int sig)
-{
-  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
-  xsignal0 (Qarith_error);
-}
-
-static void
-deliver_arith_signal (int sig)
-{
-  handle_on_main_thread (sig, handle_arith_signal);
-}
-
-void
-init_data (void)
-{
-  struct sigaction action;
-  /* Don't do this if just dumping out.
-     We don't want to call `signal' in this case
-     so that we don't have trouble with dumping
-     signal-delivering routines in an inconsistent state.  */
-#ifndef CANNOT_DUMP
-  if (!initialized)
-    return;
-#endif /* CANNOT_DUMP */
-  emacs_sigaction_init (&action, deliver_arith_signal);
-  sigaction (SIGFPE, &action, 0);
-}
diff --git a/src/dired.c b/src/dired.c
index 3aa27ecf920..4986f845101 100644
--- a/src/dired.c
+++ b/src/dired.c
@@ -101,9 +101,9 @@ static Lisp_Object
 directory_files_internal_unwind (Lisp_Object dh)
 {
   DIR *d = (DIR *) XSAVE_VALUE (dh)->pointer;
-  BLOCK_INPUT;
+  block_input ();
   closedir (d);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Qnil;
 }
 
@@ -164,9 +164,9 @@ directory_files_internal (Lisp_Object directory, Lisp_Object full,
   /* Now *bufp is the compiled form of MATCH; don't call anything
      which might compile a new regexp until we're done with the loop!  */
 
-  BLOCK_INPUT;
+  block_input ();
   d = opendir (SSDATA (dirfilename));
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (d == NULL)
     report_file_error ("Opening directory", Fcons (directory, Qnil));
 
@@ -310,9 +310,9 @@ directory_files_internal (Lisp_Object directory, Lisp_Object full,
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
   closedir (d);
-  UNBLOCK_INPUT;
+  unblock_input ();
 #ifdef WINDOWSNT
   if (attrs)
     Vw32_get_true_file_attributes = w32_save;
@@ -486,9 +486,9 @@ file_name_completion (Lisp_Object file, Lisp_Object dirname, bool all_flag,
 
   encoded_dir = ENCODE_FILE (dirname);
 
-  BLOCK_INPUT;
+  block_input ();
   d = opendir (SSDATA (Fdirectory_file_name (encoded_dir)));
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (!d)
     report_file_error ("Opening directory", Fcons (dirname, Qnil));
 
@@ -962,10 +962,10 @@ so last access time will always be midnight of that day.  */)
 
   if (!(NILP (id_format) || EQ (id_format, Qinteger)))
     {
-      BLOCK_INPUT;
+      block_input ();
       uname = stat_uname (&s);
       gname = stat_gname (&s);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   if (uname)
     values[2] = DECODE_SYSTEM (build_string (uname));
diff --git a/src/dispextern.h b/src/dispextern.h
index 1faeeb19d5b..3c42d7abb9d 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -2757,19 +2757,19 @@ struct image_type
   Lisp_Object *type;
 
   /* Check that SPEC is a valid image specification for the given
-     image type.  Value is non-zero if SPEC is valid.  */
-  int (* valid_p) (Lisp_Object spec);
+     image type.  Value is true if SPEC is valid.  */
+  bool (* valid_p) (Lisp_Object spec);
 
   /* Load IMG which is used on frame F from information contained in
-     IMG->spec.  Value is non-zero if successful.  */
-  int (* load) (struct frame *f, struct image *img);
+     IMG->spec.  Value is true if successful.  */
+  bool (* load) (struct frame *f, struct image *img);
 
   /* Free resources of image IMG which is used on frame F.  */
   void (* free) (struct frame *f, struct image *img);
 
   /* Initialization function (used for dynamic loading of image
      libraries on Windows), or NULL if none.  */
-  int (* init) (Lisp_Object);
+  bool (* init) (void);
 
   /* Next in list of all supported image types.  */
   struct image_type *next;
@@ -3169,7 +3169,7 @@ extern ptrdiff_t x_create_bitmap_from_xpm_data (struct frame *, const char **);
 extern void x_destroy_bitmap (struct frame *, ptrdiff_t);
 #endif
 extern void x_destroy_all_bitmaps (Display_Info *);
-extern int x_create_bitmap_mask (struct frame *, ptrdiff_t);
+extern void x_create_bitmap_mask (struct frame *, ptrdiff_t);
 extern Lisp_Object x_find_image_file (Lisp_Object);
 
 void x_kill_gs_process (Pixmap, struct frame *);
@@ -3177,7 +3177,7 @@ struct image_cache *make_image_cache (void);
 void free_image_cache (struct frame *);
 void clear_image_caches (Lisp_Object);
 void mark_image_cache (struct image_cache *);
-int valid_image_p (Lisp_Object);
+bool valid_image_p (Lisp_Object);
 void prepare_image_for_display (struct frame *, struct image *);
 ptrdiff_t lookup_image (struct frame *, Lisp_Object);
 
diff --git a/src/dispnew.c b/src/dispnew.c
index fc966581adb..555136d785c 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -1834,7 +1834,7 @@ adjust_glyphs (struct frame *f)
 {
   /* Block input so that expose events and other events that access
      glyph matrices are not processed while we are changing them.  */
-  BLOCK_INPUT;
+  block_input ();
 
   if (f)
     adjust_frame_glyphs (f);
@@ -1846,7 +1846,7 @@ adjust_glyphs (struct frame *f)
         adjust_frame_glyphs (XFRAME (lisp_frame));
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2242,7 +2242,7 @@ free_glyphs (struct frame *f)
     {
       /* Block interrupt input so that we don't get surprised by an X
          event while we're in an inconsistent state.  */
-      BLOCK_INPUT;
+      block_input ();
       f->glyphs_initialized_p = 0;
 
       /* Release window sub-matrices.  */
@@ -2287,7 +2287,7 @@ free_glyphs (struct frame *f)
           f->desired_pool = f->current_pool = NULL;
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -5563,10 +5563,6 @@ handle_window_change_signal (int sig)
   int width, height;
   struct tty_display_info *tty;
 
-  struct sigaction action;
-  emacs_sigaction_init (&action, deliver_window_change_signal);
-  sigaction (SIGWINCH, &action, 0);
-
   /* The frame size change obviously applies to a single
      termcap-controlled terminal, but we can't decide which.
      Therefore, we resize the frames corresponding to each tty.
@@ -5599,7 +5595,7 @@ handle_window_change_signal (int sig)
 static void
 deliver_window_change_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_window_change_signal);
+  deliver_process_signal (sig, handle_window_change_signal);
 }
 #endif /* SIGWINCH */
 
@@ -5708,7 +5704,7 @@ change_frame_size_1 (struct frame *f, int newheight, int newwidth,
       && new_frame_total_cols == FRAME_TOTAL_COLS (f))
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef MSDOS
   /* We only can set screen dimensions to certain values supported
@@ -5760,7 +5756,7 @@ change_frame_size_1 (struct frame *f, int newheight, int newwidth,
   SET_FRAME_GARBAGED (f);
   f->resized_p = 1;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   record_unwind_current_buffer ();
 
@@ -5791,9 +5787,9 @@ FILE = nil means just close any termscript file currently open.  */)
 
   if (tty->termscript != 0)
   {
-    BLOCK_INPUT;
+    block_input ();
     fclose (tty->termscript);
-    UNBLOCK_INPUT;
+    unblock_input ();
   }
   tty->termscript = 0;
 
@@ -5824,7 +5820,7 @@ when TERMINAL is nil.  */)
 
   /* ??? Perhaps we should do something special for multibyte strings here.  */
   CHECK_STRING (string);
-  BLOCK_INPUT;
+  block_input ();
 
   if (!t)
     error ("Unknown terminal device");
@@ -5849,7 +5845,7 @@ when TERMINAL is nil.  */)
     }
   fwrite (SDATA (string), 1, SBYTES (string), out);
   fflush (out);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Qnil;
 }
 
diff --git a/src/dosfns.c b/src/dosfns.c
index 3c649f4d534..ce1ec4a4f93 100644
--- a/src/dosfns.c
+++ b/src/dosfns.c
@@ -480,9 +480,9 @@ x_set_title (struct frame *f, Lisp_Object name)
 
   if (FRAME_MSDOS_P (f))
     {
-      BLOCK_INPUT;
+      block_input ();
       w95_set_virtual_machine_title (SDATA (name));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 #endif /* !HAVE_X_WINDOWS */
diff --git a/src/editfns.c b/src/editfns.c
index acf9c48e7a0..fc6465a3d46 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -1219,9 +1219,9 @@ of the user with that uid, or nil if there is no such user.  */)
     return Vuser_login_name;
 
   CONS_TO_INTEGER (uid, uid_t, id);
-  BLOCK_INPUT;
+  block_input ();
   pw = getpwuid (id);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return (pw ? build_string (pw->pw_name) : Qnil);
 }
 
@@ -1279,15 +1279,15 @@ name, or nil if there is no such user.  */)
     {
       uid_t u;
       CONS_TO_INTEGER (uid, uid_t, u);
-      BLOCK_INPUT;
+      block_input ();
       pw = getpwuid (u);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   else if (STRINGP (uid))
     {
-      BLOCK_INPUT;
+      block_input ();
       pw = getpwnam (SSDATA (uid));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   else
     error ("Invalid UID specification");
@@ -1763,14 +1763,14 @@ format_time_string (char const *format, ptrdiff_t formatlen,
   while (1)
     {
       time_t *taddr = emacs_secs_addr (&t);
-      BLOCK_INPUT;
+      block_input ();
 
       synchronize_system_time_locale ();
 
       tm = ut ? gmtime (taddr) : localtime (taddr);
       if (! tm)
         {
-          UNBLOCK_INPUT;
+          unblock_input ();
           time_overflow ();
         }
       *tmp = *tm;
@@ -1782,14 +1782,14 @@ format_time_string (char const *format, ptrdiff_t formatlen,
 
       /* Buffer was too small, so make it bigger and try again.  */
       len = emacs_nmemftime (NULL, SIZE_MAX, format, formatlen, tm, ut, ns);
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (STRING_BYTES_BOUND <= len)
         string_overflow ();
       size = len + 1;
       buf = SAFE_ALLOCA (size);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   bufstring = make_unibyte_string (buf, len);
   SAFE_FREE ();
   return code_convert_string_norecord (bufstring, Vlocale_coding_system, 0);
@@ -1817,11 +1817,11 @@ DOW and ZONE.)  */)
   struct tm *decoded_time;
   Lisp_Object list_args[9];
 
-  BLOCK_INPUT;
+  block_input ();
   decoded_time = localtime (&time_spec);
   if (decoded_time)
     save_tm = *decoded_time;
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (! (decoded_time
          && MOST_NEGATIVE_FIXNUM - TM_YEAR_BASE <= save_tm.tm_year
          && save_tm.tm_year <= MOST_POSITIVE_FIXNUM - TM_YEAR_BASE))
@@ -1837,13 +1837,13 @@ DOW and ZONE.)  */)
   XSETFASTINT (list_args[6], save_tm.tm_wday);
   list_args[7] = save_tm.tm_isdst ? Qt : Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
   decoded_time = gmtime (&time_spec);
   if (decoded_time == 0)
     list_args[8] = Qnil;
   else
     XSETINT (list_args[8], tm_diff (&save_tm, decoded_time));
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Flist (9, list_args);
 }
 
@@ -1901,9 +1901,9 @@ usage: (encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)  */)
     zone = XCAR (zone);
   if (NILP (zone))
     {
-      BLOCK_INPUT;
+      block_input ();
       value = mktime (&tm);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   else
     {
@@ -1928,7 +1928,7 @@ usage: (encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)  */)
       else
         error ("Invalid time zone specification");
 
-      BLOCK_INPUT;
+      block_input ();
 
       /* Set TZ before calling mktime; merely adjusting mktime's returned
          value doesn't suffice, since that would mishandle leap seconds.  */
@@ -1942,7 +1942,7 @@ usage: (encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)  */)
 #ifdef LOCALTIME_CACHE
       tzset ();
 #endif
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       xfree (newenv);
     }
@@ -1978,7 +1978,7 @@ but this is considered obsolete.  */)
      newline, and without the 4-digit year limit.  Don't use asctime
      or ctime, as they might dump core if the year is outside the
      range -999 .. 9999.  */
-  BLOCK_INPUT;
+  block_input ();
   tm = localtime (&value);
   if (tm)
     {
@@ -1994,7 +1994,7 @@ but this is considered obsolete.  */)
                      tm->tm_hour, tm->tm_min, tm->tm_sec,
                      tm->tm_year + year_base);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (! tm)
     time_overflow ();
 
@@ -2050,11 +2050,11 @@ the data it can't find.  */)
   zone_offset = Qnil;
   value = make_emacs_time (lisp_seconds_argument (specified_time), 0);
   zone_name = format_time_string ("%Z", sizeof "%Z" - 1, value, 0, &localtm);
-  BLOCK_INPUT;
+  block_input ();
   t = gmtime (emacs_secs_addr (&value));
   if (t)
     offset = tm_diff (&localtm, t);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (t)
     {
@@ -2101,7 +2101,7 @@ only the former.  */)
   if (! (NILP (tz) || EQ (tz, Qt)))
     CHECK_STRING (tz);
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* When called for the first time, save the original TZ.  */
   old_environbuf = environbuf;
@@ -2118,7 +2118,7 @@ only the former.  */)
   set_time_zone_rule (tzstring);
   environbuf = environ;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   xfree (old_environbuf);
   return Qnil;
diff --git a/src/emacs.c b/src/emacs.c
index 52f38925b32..05affeefde7 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -54,6 +54,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "window.h"
 
 #include "systty.h"
+#include "atimer.h"
 #include "blockinput.h"
 #include "syssignal.h"
 #include "process.h"
@@ -95,6 +96,11 @@ static const char emacs_copyright[] = COPYRIGHT;
 /* Empty lisp strings.  To avoid having to build any others.  */
 Lisp_Object empty_unibyte_string, empty_multibyte_string;
 
+#ifdef WINDOWSNT
+/* Cache for externally loaded libraries.  */
+Lisp_Object Vlibrary_cache;
+#endif
+
 /* Set after Emacs has started up the first time.
    Prevents reinitialization of the Lisp world and keymaps
    on subsequent starts.  */
@@ -269,9 +275,6 @@ Report bugs to bug-gnu-emacs@gnu.org.  First, please see the Bugs\n\
 section of the Emacs manual or the file BUGS.\n"
 
 
-/* Signal code for the fatal signal that was received.  */
-static int fatal_error_code;
-
 /* True if handling a fatal error already.  */
 bool fatal_error_in_progress;
 
@@ -282,28 +285,13 @@ static void *ns_pool;
 
 
 
-/* Handle bus errors, invalid instruction, etc.  */
-static void
-handle_fatal_signal (int sig)
-{
-  fatal_error_backtrace (sig, 10);
-}
-
-static void
-deliver_fatal_signal (int sig)
-{
-  handle_on_main_thread (sig, handle_fatal_signal);
-}
-
 /* Report a fatal error due to signal SIG, output a backtrace of at
    most BACKTRACE_LIMIT lines, and exit.  */
 _Noreturn void
-fatal_error_backtrace (int sig, int backtrace_limit)
+terminate_due_to_signal (int sig, int backtrace_limit)
 {
-  fatal_error_code = sig;
   signal (sig, SIG_DFL);
-
-  TOTALLY_UNBLOCK_INPUT;
+  totally_unblock_input ();
 
   /* If fatal error occurs in code below, avoid infinite recursion.  */
   if (! fatal_error_in_progress)
@@ -318,19 +306,18 @@ fatal_error_backtrace (int sig, int backtrace_limit)
     }
 
   /* Signal the same code; this time it will really be fatal.
-     Remember that since we're in a signal handler, the signal we're
-     going to send is probably blocked, so we have to unblock it if we
-     want to really receive it.  */
+     Since we're in a signal handler, the signal is blocked, so we
+     have to unblock it if we want to really receive it.  */
 #ifndef MSDOS
   {
     sigset_t unblocked;
     sigemptyset (&unblocked);
-    sigaddset (&unblocked, fatal_error_code);
+    sigaddset (&unblocked, sig);
     pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
   }
 #endif
 
-  kill (getpid (), fatal_error_code);
+  emacs_raise (sig);
 
   /* This shouldn't be executed, but it prevents a warning.  */
   exit (1);
@@ -339,15 +326,9 @@ fatal_error_backtrace (int sig, int backtrace_limit)
 #ifdef SIGDANGER
 
 /* Handler for SIGDANGER.  */
-static void deliver_danger_signal (int);
-
 static void
 handle_danger_signal (int sig)
 {
-  struct sigaction action;
-  emacs_sigaction_init (&action, deliver_danger_signal);
-  sigaction (sig, &action, 0);
-
   malloc_warning ("Operating system warns that virtual memory is running low.\n");
 
   /* It might be unsafe to call do_auto_save now.  */
@@ -357,7 +338,7 @@ handle_danger_signal (int sig)
 static void
 deliver_danger_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_danger_signal);
+  deliver_process_signal (sig, handle_danger_signal);
 }
 #endif
 
@@ -680,6 +661,7 @@ main (int argc, char **argv)
 #endif
   char stack_bottom_variable;
   bool do_initial_setlocale;
+  bool dumping;
   int skip_args = 0;
 #ifdef HAVE_SETRLIMIT
   struct rlimit rlim;
@@ -691,7 +673,6 @@ main (int argc, char **argv)
   char dname_arg2[80];
 #endif
   char *ch_to_dir;
-  struct sigaction fatal_error_action;
 
 #if GC_MARK_STACK
   stack_base = &dummy;
@@ -777,12 +758,11 @@ main (int argc, char **argv)
         exit (1);
       }
 
+  dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
+                             || strcmp (argv[argc - 1], "bootstrap") == 0);
 
 #ifdef HAVE_PERSONALITY_LINUX32
-  if (!initialized
-      && (strcmp (argv[argc-1], "dump") == 0
-          || strcmp (argv[argc-1], "bootstrap") == 0)
-      && ! getenv ("EMACS_HEAP_EXEC"))
+  if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
     {
       static char heapexec[] = "EMACS_HEAP_EXEC=true";
       /* Set this so we only do this once.  */
@@ -1107,119 +1087,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
 #endif
     }
 
-  init_signals ();
-  emacs_sigaction_init (&fatal_error_action, deliver_fatal_signal);
-
-  /* Don't catch SIGHUP if dumping.  */
-  if (1
-#ifndef CANNOT_DUMP
-      && initialized
-#endif
-      )
-    {
-      /* In --batch mode, don't catch SIGHUP if already ignored.
-         That makes nohup work.  */
-      bool catch_SIGHUP = !noninteractive;
-      if (!catch_SIGHUP)
-        {
-          struct sigaction old_action;
-          sigaction (SIGHUP, 0, &old_action);
-          catch_SIGHUP = old_action.sa_handler != SIG_IGN;
-        }
-      if (catch_SIGHUP)
-        sigaction (SIGHUP, &fatal_error_action, 0);
-    }
-
-  if (
-#ifndef CANNOT_DUMP
-      ! noninteractive || initialized
-#else
-      1
-#endif
-      )
-    {
-      /* Don't catch these signals in batch mode if dumping.
-         On some machines, this sets static data that would make
-         signal fail to work right when the dumped Emacs is run.  */
-      sigaction (SIGQUIT, &fatal_error_action, 0);
-      sigaction (SIGILL, &fatal_error_action, 0);
-      sigaction (SIGTRAP, &fatal_error_action, 0);
-#ifdef SIGUSR1
-      add_user_signal (SIGUSR1, "sigusr1");
-#endif
-#ifdef SIGUSR2
-      add_user_signal (SIGUSR2, "sigusr2");
-#endif
-#ifdef SIGABRT
-      sigaction (SIGABRT, &fatal_error_action, 0);
-#endif
-#ifdef SIGHWE
-      sigaction (SIGHWE, &fatal_error_action, 0);
-#endif
-#ifdef SIGPRE
-      sigaction (SIGPRE, &fatal_error_action, 0);
-#endif
-#ifdef SIGORE
-      sigaction (SIGORE, &fatal_error_action, 0);
-#endif
-#ifdef SIGUME
-      sigaction (SIGUME, &fatal_error_action, 0);
-#endif
-#ifdef SIGDLK
-      sigaction (SIGDLK, &fatal_error_action, 0);
-#endif
-#ifdef SIGCPULIM
-      sigaction (SIGCPULIM, &fatal_error_action, 0);
-#endif
-#ifdef SIGIOT
-      /* This is missing on some systems - OS/2, for example.  */
-      sigaction (SIGIOT, &fatal_error_action, 0);
-#endif
-#ifdef SIGEMT
-      sigaction (SIGEMT, &fatal_error_action, 0);
-#endif
-      sigaction (SIGFPE, &fatal_error_action, 0);
-#ifdef SIGBUS
-      sigaction (SIGBUS, &fatal_error_action, 0);
-#endif
-      sigaction (SIGSEGV, &fatal_error_action, 0);
-#ifdef SIGSYS
-      sigaction (SIGSYS, &fatal_error_action, 0);
-#endif
-      /*  May need special treatment on MS-Windows. See
-          http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg01062.html
-          Please update the doc of kill-emacs, kill-emacs-hook, and
-          NEWS if you change this.
-      */
-      if (noninteractive)
-        sigaction (SIGINT, &fatal_error_action, 0);
-      sigaction (SIGTERM, &fatal_error_action, 0);
-#ifdef SIGXCPU
-      sigaction (SIGXCPU, &fatal_error_action, 0);
-#endif
-#ifdef SIGXFSZ
-      sigaction (SIGXFSZ, &fatal_error_action, 0);
-#endif /* SIGXFSZ */
-
-#ifdef SIGDANGER
-      /* This just means available memory is getting low.  */
-      {
-        struct sigaction action;
-        emacs_sigaction_init (&action, deliver_danger_signal);
-        sigaction (SIGDANGER, &action, 0);
-      }
-#endif
-
-#ifdef AIX
-/* 20 is SIGCHLD, 21 is SIGTTIN, 22 is SIGTTOU.  */
-      sigaction (SIGXCPU, &fatal_error_action, 0);
-      sigaction (SIGIOINT, &fatal_error_action, 0);
-      sigaction (SIGGRANT, &fatal_error_action, 0);
-      sigaction (SIGRETRACT, &fatal_error_action, 0);
-      sigaction (SIGSOUND, &fatal_error_action, 0);
-      sigaction (SIGMSG, &fatal_error_action, 0);
-#endif /* AIX */
-    }
+  init_signals (dumping);
 
   noninteractive1 = noninteractive;
 
@@ -1281,7 +1149,6 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
     }
 
   init_eval ();
-  init_data ();
   init_atimer ();
   running_asynch_code = 0;
   init_random ();
@@ -1396,7 +1263,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
   globals_of_w32 ();
   /* Initialize environment from registry settings.  */
   init_environment (argv);
-  init_ntproc ();       /* must precede init_editfns.  */
+  init_ntproc (dumping); /* must precede init_editfns.  */
 #endif
 
   /* Initialize and GC-protect Vinitial_environment and
@@ -1407,8 +1274,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
   /* egetenv is a pretty low-level facility, which may get called in
      many circumstances; it seems flimsy to put off initializing it
      until calling init_callproc.  Do not do it when dumping.  */
-  if (initialized || ((strcmp (argv[argc-1], "dump") != 0
-                       && strcmp (argv[argc-1], "bootstrap") != 0)))
+  if (! dumping)
     set_initial_environment ();
 
   /* AIX crashes are reported in system versions 3.2.3 and 3.2.4
@@ -1553,6 +1419,8 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
       syms_of_ntterm ();
 #endif /* WINDOWSNT */
 
+      syms_of_profiler ();
+
       keys_of_casefiddle ();
       keys_of_cmds ();
       keys_of_buffer ();
@@ -2045,7 +1913,7 @@ shut_down_emacs (int sig, Lisp_Object stuff)
   ignore_sigio ();
 
 #ifdef WINDOWSNT
-  term_ntproc ();
+  term_ntproc (0);
 #endif
 
   /* Do this only if terminating normally, we want glyph matrices
@@ -2164,6 +2032,13 @@ You must run Emacs in batch mode in order to dump it.  */)
   free (malloc_state_ptr);
 #endif
 
+#ifdef WINDOWSNT
+  Vlibrary_cache = Qnil;
+#endif
+#ifdef HAVE_WINDOW_SYSTEM
+  reset_image_types ();
+#endif
+
   Vpurify_flag = tem;
 
   return unbind_to (count, Qnil);
@@ -2496,6 +2371,11 @@ libraries; only those already known by Emacs will be loaded.  */);
   Vdynamic_library_alist = Qnil;
   Fput (intern_c_string ("dynamic-library-alist"), Qrisky_local_variable, Qt);
 
+#ifdef WINDOWSNT
+  Vlibrary_cache = Qnil;
+  staticpro (&Vlibrary_cache);
+#endif
+
   /* Make sure IS_DAEMON starts up as false.  */
   daemon_pipe[1] = 0;
 }
diff --git a/src/eval.c b/src/eval.c
index e47478bb1f1..561ba922482 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -31,17 +31,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "xterm.h"
 #endif
 
-struct backtrace
-{
-  struct backtrace *next;
-  Lisp_Object *function;
-  Lisp_Object *args;    /* Points to vector of args.  */
-  ptrdiff_t nargs;      /* Length of vector.  */
-  /* Nonzero means call value of debugger when done with this operation.  */
-  unsigned int debug_on_exit : 1;
-};
-
-static struct backtrace *backtrace_list;
+struct backtrace *backtrace_list;
 
 #if !BYTE_MARK_STACK
 static
@@ -562,7 +552,7 @@ interactive_p (void)
 
   /* If this isn't a byte-compiled function, there may be a frame at
      the top for Finteractive_p.  If so, skip it.  */
-  fun = Findirect_function (*btp->function, Qnil);
+  fun = Findirect_function (btp->function, Qnil);
   if (SUBRP (fun) && (XSUBR (fun) == &Sinteractive_p
                       || XSUBR (fun) == &Scalled_interactively_p))
     btp = btp->next;
@@ -575,7 +565,7 @@ interactive_p (void)
      If this isn't a byte-compiled function, then we may now be
      looking at several frames for special forms.  Skip past them.  */
   while (btp
-         && (EQ (*btp->function, Qbytecode)
+         && (EQ (btp->function, Qbytecode)
              || btp->nargs == UNEVALLED))
     btp = btp->next;
 
@@ -583,13 +573,13 @@ interactive_p (void)
      a special form, ignoring frames for Finteractive_p and/or
      Fbytecode at the top.  If this frame is for a built-in function
      (such as load or eval-region) return false.  */
-  fun = Findirect_function (*btp->function, Qnil);
+  fun = Findirect_function (btp->function, Qnil);
   if (SUBRP (fun))
     return 0;
 
   /* `btp' points to the frame of a Lisp function that called interactive-p.
      Return t if that function was called interactively.  */
-  if (btp && btp->next && EQ (*btp->next->function, Qcall_interactively))
+  if (btp && btp->next && EQ (btp->next->function, Qcall_interactively))
     return 1;
   return 0;
 }
@@ -1076,7 +1066,7 @@ internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object
 /* Unwind the specbind, catch, and handler stacks back to CATCH, and
    jump to that CATCH, returning VALUE as the value of that catch.
 
-   This is the guts Fthrow and Fsignal; they differ only in the way
+   This is the guts of Fthrow and Fsignal; they differ only in the way
    they choose the catch tag to throw to.  A catch tag for a
    condition-case form has a TAG of Qnil.
 
@@ -1085,7 +1075,7 @@ internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object
    the handler stack as we go, so that the proper handlers are in
    effect for each unwind-protect clause we run.  At the end, restore
    some static info saved in CATCH, and longjmp to the location
-   specified in the
+   specified there.
 
    This is used for correct unwinding in Fthrow and Fsignal.  */
 
@@ -1099,7 +1089,7 @@ unwind_to_catch (struct catchtag *catch, Lisp_Object value)
 
   /* Restore certain special C variables.  */
   set_poll_suppress_count (catch->poll_suppress_count);
-  UNBLOCK_INPUT_TO (catch->interrupt_input_blocked);
+  unblock_input_to (catch->interrupt_input_blocked);
   immediate_quit = 0;
 
   do
@@ -1114,16 +1104,6 @@ unwind_to_catch (struct catchtag *catch, Lisp_Object value)
     }
   while (! last_time);
 
-#if HAVE_X_WINDOWS
-  /* If x_catch_errors was done, turn it off now.
-     (First we give unbind_to a chance to do that.)  */
-#if 0 /* This would disable x_catch_errors after x_connection_closed.
-         The catch must remain in effect during that delicate
-         state. --lorentey  */
-  x_fully_uncatch_errors ();
-#endif
-#endif
-
   byte_stack_list = catch->byte_stack;
   gcprolist = catch->gcpro;
 #ifdef DEBUG_GCPRO
@@ -1516,10 +1496,10 @@ See also the function `condition-case'.  */)
   if (backtrace_list && !NILP (error_symbol))
     {
       bp = backtrace_list->next;
-      if (bp && bp->function && EQ (*bp->function, Qerror))
+      if (bp && EQ (bp->function, Qerror))
         bp = bp->next;
-      if (bp && bp->function)
-        Vsignaling_function = *bp->function;
+      if (bp)
+        Vsignaling_function = bp->function;
     }
 
   for (h = handlerlist; h; h = h->next)
@@ -1530,7 +1510,7 @@ See also the function `condition-case'.  */)
     }
 
   if (/* Don't run the debugger for a memory-full error.
-         (There is no room in memory to do that!) */
+         (There is no room in memory to do that!)  */
       !NILP (error_symbol)
       && (!NILP (Vdebug_on_signal)
           /* If no handler is present now, try to run the debugger.  */
@@ -1713,7 +1693,7 @@ maybe_call_debugger (Lisp_Object conditions, Lisp_Object sig, Lisp_Object data)
   if (
       /* Don't try to run the debugger with interrupts blocked.
          The editing loop would return anyway.  */
-      ! INPUT_BLOCKED_P
+      ! input_blocked_p ()
       && NILP (Vinhibit_debugger)
       /* Does user want to enter debugger for this kind of error?  */
       && (EQ (sig, Qquit)
@@ -2065,11 +2045,11 @@ eval_sub (Lisp_Object form)
   original_args = XCDR (form);
 
   backtrace.next = backtrace_list;
-  backtrace_list = &backtrace;
-  backtrace.function = &original_fun; /* This also protects them from gc.  */
+  backtrace.function = original_fun; /* This also protects them from gc.  */
   backtrace.args = &original_args;
   backtrace.nargs = UNEVALLED;
   backtrace.debug_on_exit = 0;
+  backtrace_list = &backtrace;
 
   if (debug_on_next_call)
     do_debug_on_call (Qt);
@@ -2371,14 +2351,10 @@ usage: (run-hooks &rest HOOKS)  */)
 DEFUN ("run-hook-with-args", Frun_hook_with_args,
        Srun_hook_with_args, 1, MANY, 0,
        doc: /* Run HOOK with the specified arguments ARGS.
-HOOK should be a symbol, a hook variable.  If HOOK has a non-nil
-value, that value may be a function or a list of functions to be
-called to run the hook.  If the value is a function, it is called with
-the given arguments and its return value is returned.  If it is a list
-of functions, those functions are called, in order,
-with the given arguments ARGS.
-It is best not to depend on the value returned by `run-hook-with-args',
-as that may change.
+HOOK should be a symbol, a hook variable.  The value of HOOK
+may be nil, a function, or a list of functions.  Call each
+function in order with arguments ARGS.  The final return value
+is unspecified.
 
 Do not use `make-local-variable' to make a hook variable buffer-local.
 Instead, use `add-hook' and specify t for the LOCAL argument.
@@ -2388,18 +2364,18 @@ usage: (run-hook-with-args HOOK &rest ARGS)  */)
   return run_hook_with_args (nargs, args, funcall_nil);
 }
 
+/* NB this one still documents a specific non-nil return value.
+   (As did run-hook-with-args and run-hook-with-args-until-failure
+   until they were changed in 24.1.)  */
 DEFUN ("run-hook-with-args-until-success", Frun_hook_with_args_until_success,
        Srun_hook_with_args_until_success, 1, MANY, 0,
        doc: /* Run HOOK with the specified arguments ARGS.
-HOOK should be a symbol, a hook variable.  If HOOK has a non-nil
-value, that value may be a function or a list of functions to be
-called to run the hook.  If the value is a function, it is called with
-the given arguments and its return value is returned.
-If it is a list of functions, those functions are called, in order,
-with the given arguments ARGS, until one of them
-returns a non-nil value.  Then we return that value.
-However, if they all return nil, we return nil.
-If the value of HOOK is nil, this function returns nil.
+HOOK should be a symbol, a hook variable.  The value of HOOK
+may be nil, a function, or a list of functions.  Call each
+function in order with arguments ARGS, stopping at the first
+one that returns non-nil, and return that value.  Otherwise (if
+all functions return nil, or if there are no functions to call),
+return nil.
 
 Do not use `make-local-variable' to make a hook variable buffer-local.
 Instead, use `add-hook' and specify t for the LOCAL argument.
@@ -2418,15 +2394,12 @@ funcall_not (ptrdiff_t nargs, Lisp_Object *args)
 DEFUN ("run-hook-with-args-until-failure", Frun_hook_with_args_until_failure,
        Srun_hook_with_args_until_failure, 1, MANY, 0,
        doc: /* Run HOOK with the specified arguments ARGS.
-HOOK should be a symbol, a hook variable.  If HOOK has a non-nil
-value, that value may be a function or a list of functions to be
-called to run the hook.  If the value is a function, it is called with
-the given arguments.  Then we return nil if the function returns nil,
-and t if it returns non-nil.
-If it is a list of functions, those functions are called, in order,
-with the given arguments ARGS, until one of them returns nil.
-Then we return nil.  However, if they all return non-nil, we return t.
-If the value of HOOK is nil, this function returns t.
+HOOK should be a symbol, a hook variable.  The value of HOOK
+may be nil, a function, or a list of functions.  Call each
+function in order with arguments ARGS, stopping at the first
+one that returns nil, and return nil.  Otherwise (if all functions
+return non-nil, or if there are no functions to call), return non-nil
+\(do not rely on the precise return value in this case).
 
 Do not use `make-local-variable' to make a hook variable buffer-local.
 Instead, use `add-hook' and specify t for the LOCAL argument.
@@ -2740,11 +2713,11 @@ usage: (funcall FUNCTION &rest ARGUMENTS)  */)
     }
 
   backtrace.next = backtrace_list;
-  backtrace_list = &backtrace;
-  backtrace.function = &args[0];
+  backtrace.function = args[0];
   backtrace.args = &args[1];    /* This also GCPROs them.  */
   backtrace.nargs = nargs - 1;
   backtrace.debug_on_exit = 0;
+  backtrace_list = &backtrace;
 
   /* Call GC after setting up the backtrace, so the latter GCPROs the args.  */
   maybe_gc ();
@@ -3316,12 +3289,12 @@ Output stream used is value of `standard-output'.  */)
       write_string (backlist->debug_on_exit ? "* " : "  ", 2);
       if (backlist->nargs == UNEVALLED)
         {
-          Fprin1 (Fcons (*backlist->function, *backlist->args), Qnil);
+          Fprin1 (Fcons (backlist->function, *backlist->args), Qnil);
           write_string ("\n", -1);
         }
       else
         {
-          tem = *backlist->function;
+          tem = backlist->function;
           Fprin1 (tem, Qnil);   /* This can QUIT.  */
           write_string ("(", -1);
           if (backlist->nargs == MANY)
@@ -3379,7 +3352,7 @@ If NFRAMES is more than the number of frames, the value is nil.  */)
   if (!backlist)
     return Qnil;
   if (backlist->nargs == UNEVALLED)
-    return Fcons (Qnil, Fcons (*backlist->function, *backlist->args));
+    return Fcons (Qnil, Fcons (backlist->function, *backlist->args));
   else
     {
       if (backlist->nargs == MANY) /* FIXME: Can this happen?  */
@@ -3387,7 +3360,7 @@ If NFRAMES is more than the number of frames, the value is nil.  */)
       else
         tem = Flist (backlist->nargs, backlist->args);
 
-      return Fcons (Qt, Fcons (*backlist->function, tem));
+      return Fcons (Qt, Fcons (backlist->function, tem));
     }
 }
 
diff --git a/src/fileio.c b/src/fileio.c
index 6c4e34d7312..9d8a0dc8b45 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -1025,9 +1025,9 @@ filesystem tree, not (expand-file-name ".."  dirname).  */)
           memcpy (o, nm, p - nm);
           o [p - nm] = 0;
 
-          BLOCK_INPUT;
+          block_input ();
           pw = (struct passwd *) getpwnam (o + 1);
-          UNBLOCK_INPUT;
+          unblock_input ();
           if (pw)
             {
               newdir = pw->pw_dir;
@@ -1413,9 +1413,9 @@ See also the function `substitute-in-file-name'.")
         o[len] = 0;
 
         /* Look up the user name.  */
-        BLOCK_INPUT;
+        block_input ();
         pw = (struct passwd *) getpwnam (o + 1);
-        UNBLOCK_INPUT;
+        unblock_input ();
         if (!pw)
           error ("\"%s\" isn't a registered user", o + 1);
 
@@ -1531,9 +1531,9 @@ search_embedded_absfilename (char *nm, char *endp)
               /* If we have ~user and `user' exists, discard
                  everything up to ~.  But if `user' does not exist, leave
                  ~user alone, it might be a literal file name.  */
-              BLOCK_INPUT;
+              block_input ();
               pw = getpwnam (o + 1);
-              UNBLOCK_INPUT;
+              unblock_input ();
               if (pw)
                 return p;
             }
@@ -2999,10 +2999,10 @@ The value is an integer.  */)
   mode_t realmask;
   Lisp_Object value;
 
-  BLOCK_INPUT;
+  block_input ();
   realmask = umask (0);
   umask (realmask);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   XSETINT (value, (~ realmask) & 0777);
   return value;
@@ -5235,9 +5235,9 @@ do_auto_save_unwind (Lisp_Object arg)  /* used as unwind-protect function */
   auto_saving = 0;
   if (stream != NULL)
     {
-      BLOCK_INPUT;
+      block_input ();
       fclose (stream);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   return Qnil;
 }
@@ -5368,7 +5368,7 @@ A non-nil CURRENT-ONLY argument means save only current buffer.  */)
         if (STRINGP (BVAR (b, auto_save_file_name))
             && stream != NULL && do_handled_files == 0)
           {
-            BLOCK_INPUT;
+            block_input ();
             if (!NILP (BVAR (b, filename)))
               {
                 fwrite (SDATA (BVAR (b, filename)), 1,
@@ -5378,7 +5378,7 @@ A non-nil CURRENT-ONLY argument means save only current buffer.  */)
             fwrite (SDATA (BVAR (b, auto_save_file_name)), 1,
                     SBYTES (BVAR (b, auto_save_file_name)), stream);
             putc ('\n', stream);
-            UNBLOCK_INPUT;
+            unblock_input ();
           }
 
         if (!NILP (current_only)
diff --git a/src/floatfns.c b/src/floatfns.c
index 4fe209fcb61..645a5957609 100644
--- a/src/floatfns.c
+++ b/src/floatfns.c
@@ -31,15 +31,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <config.h>
 
 #include "lisp.h"
-#include "syssignal.h"
-
-#include <float.h>
-#if (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \
-     && FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128)
-#define IEEE_FLOATING_POINT 1
-#else
-#define IEEE_FLOATING_POINT 0
-#endif
 
 #include <math.h>
 
diff --git a/src/fns.c b/src/fns.c
index 42c4f817f29..6d6f019b311 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -61,8 +61,9 @@ DEFUN ("identity", Fidentity, Sidentity, 1, 1, 0,
 
 DEFUN ("random", Frandom, Srandom, 0, 1, 0,
        doc: /* Return a pseudo-random number.
-All integers representable in Lisp are equally likely.
-  On most systems, this is 29 bits' worth.
+All integers representable in Lisp, i.e. between `most-negative-fixnum'
+and `most-positive-fixnum', inclusive, are equally likely.
+
 With positive integer LIMIT, return random number in interval [0,LIMIT).
 With argument t, set the random number seed from the current time and pid.
 Other values of LIMIT are ignored.  */)
@@ -1838,13 +1839,6 @@ properties on the list.  This function never signals an error.  */)
       halftail = XCDR (halftail);
       if (EQ (tail, halftail))
         break;
-
-#if 0 /* Unsafe version.  */
-      /* This function can be called asynchronously
-         (setup_coding_system).  Don't QUIT in that case.  */
-      if (!interrupt_input_blocked)
-        QUIT;
-#endif
     }
 
   return Qnil;
diff --git a/src/fontset.c b/src/fontset.c
index 35d4bfb367e..7b051cbe1f3 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -1275,7 +1275,7 @@ free_realized_fontsets (Lisp_Object base)
      doesn't remove FACE from a cache.  Until we find a solution, we
      suppress this code, and simply use Fclear_face_cache even though
      that is not efficient.  */
-  BLOCK_INPUT;
+  block_input ();
   for (id = 0; id < ASIZE (Vfontset_table); id++)
     {
       Lisp_Object this = AREF (Vfontset_table, id);
@@ -1296,7 +1296,7 @@ free_realized_fontsets (Lisp_Object base)
             }
         }
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 #else  /* not 0 */
   /* But, we don't have to call Fclear_face_cache if no fontset has
      been realized from BASE.  */
diff --git a/src/frame.c b/src/frame.c
index f3d16171516..4bcacef39c5 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -3533,9 +3533,9 @@ x_set_alpha (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     f->alpha[i] = newval[i];
 
 #if defined (HAVE_X_WINDOWS) || defined (HAVE_NTGUI) || defined (NS_IMPL_COCOA)
-  BLOCK_INPUT;
+  block_input ();
   x_set_frame_alpha (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif
 
   return;
diff --git a/src/frame.h b/src/frame.h
index 661ea2ea67c..26235cc036e 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -1203,7 +1203,7 @@ extern Lisp_Object Qrun_hook_with_args;
 extern void x_set_scroll_bar_default_width (struct frame *);
 extern void x_set_offset (struct frame *, int, int, int);
 extern void x_wm_set_icon_position (struct frame *, int, int);
-extern void x_wm_set_size_hint (FRAME_PTR f, long flags, int user_position);
+extern void x_wm_set_size_hint (FRAME_PTR f, long flags, bool user_position);
 
 extern Lisp_Object x_new_font (struct frame *, Lisp_Object, int);
 
@@ -1249,7 +1249,7 @@ extern Lisp_Object display_x_get_resource (Display_Info *,
                                            Lisp_Object component,
                                            Lisp_Object subclass);
 
-extern void set_frame_menubar (struct frame *f, int first_time, int deep_p);
+extern void set_frame_menubar (struct frame *f, bool first_time, bool deep_p);
 extern void x_set_window_size (struct frame *f, int change_grav,
                               int cols, int rows);
 extern void x_sync (struct frame *);
@@ -1283,9 +1283,6 @@ extern char *x_get_resource_string (const char *, const char *);
 
 extern void x_query_colors (struct frame *f, XColor *, int);
 
-/* In xmenu.c */
-extern void set_frame_menubar (FRAME_PTR, int, int);
-
 #endif /* HAVE_WINDOW_SYSTEM */
 
 INLINE_HEADER_END
diff --git a/src/fringe.c b/src/fringe.c
index 6e6deeddb08..d788503e91e 100644
--- a/src/fringe.c
+++ b/src/fringe.c
@@ -872,7 +872,7 @@ draw_fringe_bitmap (struct window *w, struct glyph_row *row, int left_p)
 void
 draw_row_fringe_bitmaps (struct window *w, struct glyph_row *row)
 {
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
 
   /* If row is completely invisible, because of vscrolling, we
      don't have to draw anything.  */
diff --git a/src/ftxfont.c b/src/ftxfont.c
index 466250bd43f..5effe6e9104 100644
--- a/src/ftxfont.c
+++ b/src/ftxfont.c
@@ -98,7 +98,7 @@ ftxfont_get_gcs (FRAME_PTR f, long unsigned int foreground, long unsigned int ba
   new->colors[0].pixel = background;
   new->colors[1].pixel = foreground;
 
-  BLOCK_INPUT;
+  block_input ();
   XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), new->colors, 2);
   for (i = 1; i < 7; i++)
     {
@@ -115,14 +115,14 @@ ftxfont_get_gcs (FRAME_PTR f, long unsigned int foreground, long unsigned int ba
       new->gcs[i - 1] = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                                    GCForeground, &xgcv);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (i < 7)
     {
-      BLOCK_INPUT;
+      block_input ();
       for (i--; i >= 0; i--)
         XFreeGC (FRAME_X_DISPLAY (f), new->gcs[i]);
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (prev)
         prev->next = new->next;
       else if (data)
@@ -282,7 +282,7 @@ ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
 
   n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0;
 
-  BLOCK_INPUT;
+  block_input ();
   if (with_background)
     ftxfont_draw_background (f, font, s->gc, x, y, s->width);
   code = alloca (sizeof (unsigned) * len);
@@ -332,7 +332,7 @@ ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return len;
 }
@@ -342,7 +342,7 @@ ftxfont_end_for_frame (FRAME_PTR f)
 {
   struct ftxfont_frame_data *data = font_get_frame_data (f, &ftxfont_driver);
 
-  BLOCK_INPUT;
+  block_input ();
   while (data)
     {
       struct ftxfont_frame_data *next = data->next;
@@ -353,7 +353,7 @@ ftxfont_end_for_frame (FRAME_PTR f)
       free (data);
       data = next;
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
   font_put_frame_data (f, &ftxfont_driver, NULL);
   return 0;
 }
diff --git a/src/gnutls.c b/src/gnutls.c
index 1c4693aee32..e3d84a0b61b 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -30,15 +30,14 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "w32.h"
 #endif
 
-static int
-emacs_gnutls_handle_error (gnutls_session_t, int err);
+static bool emacs_gnutls_handle_error (gnutls_session_t, int);
 
 static Lisp_Object Qgnutls_dll;
 static Lisp_Object Qgnutls_code;
 static Lisp_Object Qgnutls_anon, Qgnutls_x509pki;
 static Lisp_Object Qgnutls_e_interrupted, Qgnutls_e_again,
   Qgnutls_e_invalid_session, Qgnutls_e_not_ready_for_handshake;
-static int gnutls_global_initialized;
+static bool gnutls_global_initialized;
 
 /* The following are for the property list of `gnutls-boot'.  */
 static Lisp_Object QCgnutls_bootprop_priority;
@@ -141,13 +140,13 @@ DEF_GNUTLS_FN (int, gnutls_x509_crt_import,
                 gnutls_x509_crt_fmt_t));
 DEF_GNUTLS_FN (int, gnutls_x509_crt_init, (gnutls_x509_crt_t *));
 
-static int
-init_gnutls_functions (Lisp_Object libraries)
+static bool
+init_gnutls_functions (void)
 {
   HMODULE library;
   int max_log_level = 1;
 
-  if (!(library = w32_delayed_load (libraries, Qgnutls_dll)))
+  if (!(library = w32_delayed_load (Qgnutls_dll)))
     {
       GNUTLS_LOG (1, max_log_level, "GnuTLS library not found");
       return 0;
@@ -438,7 +437,7 @@ emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte)
   else if (rtnval == GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
     /* The peer closed the connection. */
     return 0;
-  else if (emacs_gnutls_handle_error (state, rtnval) == 0)
+  else if (emacs_gnutls_handle_error (state, rtnval))
     /* non-fatal error */
     return -1;
   else {
@@ -447,19 +446,19 @@ emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte)
   }
 }
 
-/* report a GnuTLS error to the user.
-   Returns zero if the error code was successfully handled. */
-static int
+/* Report a GnuTLS error to the user.
+   Return true if the error code was successfully handled.  */
+static bool
 emacs_gnutls_handle_error (gnutls_session_t session, int err)
 {
   int max_log_level = 0;
 
-  int ret;
+  bool ret;
   const char *str;
 
   /* TODO: use a Lisp_Object generated by gnutls_make_error?  */
   if (err >= 0)
-    return 0;
+    return 1;
 
   max_log_level = global_gnutls_log_level;
 
@@ -471,12 +470,12 @@ emacs_gnutls_handle_error (gnutls_session_t session, int err)
 
   if (fn_gnutls_error_is_fatal (err))
     {
-      ret = err;
+      ret = 0;
       GNUTLS_LOG2 (0, max_log_level, "fatal error:", str);
     }
   else
     {
-      ret = 0;
+      ret = 1;
       GNUTLS_LOG2 (1, max_log_level, "non-fatal error:", str);
       /* TODO: EAGAIN AKA Qgnutls_e_again should be level 2.  */
     }
@@ -656,7 +655,7 @@ DEFUN ("gnutls-available-p", Fgnutls_available_p, Sgnutls_available_p, 0, 0, 0,
   else
     {
       Lisp_Object status;
-      status = init_gnutls_functions (Vdynamic_library_alist) ? Qt : Qnil;
+      status = init_gnutls_functions () ? Qt : Qnil;
       Vlibrary_cache = Fcons (Fcons (Qgnutls_dll, status), Vlibrary_cache);
       return status;
     }
diff --git a/src/gtkutil.c b/src/gtkutil.c
index 1eb4b2cabdf..1bf2b533b41 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -576,21 +576,21 @@ get_utf8_string (const char *str)
 
 /* Check for special colors used in face spec for region face.
    The colors are fetched from the Gtk+ theme.
-   Return 1 if color was found, 0 if not.  */
+   Return true if color was found, false if not.  */
 
-int
+bool
 xg_check_special_colors (struct frame *f,
                          const char *color_name,
                          XColor *color)
 {
-  int success_p = 0;
-  int get_bg = strcmp ("gtk_selection_bg_color", color_name) == 0;
-  int get_fg = !get_bg && strcmp ("gtk_selection_fg_color", color_name) == 0;
+  bool success_p = 0;
+  bool get_bg = strcmp ("gtk_selection_bg_color", color_name) == 0;
+  bool get_fg = !get_bg && strcmp ("gtk_selection_fg_color", color_name) == 0;
 
   if (! FRAME_GTK_WIDGET (f) || ! (get_bg || get_fg))
     return success_p;
 
-  BLOCK_INPUT;
+  block_input ();
   {
 #ifdef HAVE_GTK3
     GtkStyleContext *gsty
@@ -604,8 +604,9 @@ xg_check_special_colors (struct frame *f,
       gtk_style_context_get_background_color (gsty, state, &col);
 
     sprintf (buf, "rgbi:%lf/%lf/%lf", col.red, col.green, col.blue);
-    success_p = XParseColor (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f),
-                             buf, color);
+    success_p = (XParseColor (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f),
+                              buf, color)
+                 != 0);
 #else
     GtkStyle *gsty = gtk_widget_get_style (FRAME_GTK_WIDGET (f));
     GdkColor *grgb = get_bg
@@ -620,7 +621,7 @@ xg_check_special_colors (struct frame *f,
 #endif
 
   }
-  UNBLOCK_INPUT;
+  unblock_input ();
   return success_p;
 }
 
@@ -703,9 +704,9 @@ qttip_cb (GtkWidget  *widget,
 #endif /* USE_GTK_TOOLTIP */
 
 /* Prepare a tooltip to be shown, i.e. calculate WIDTH and HEIGHT.
-   Return zero if no system tooltip available, non-zero otherwise.  */
+   Return true if a system tooltip is available.  */
 
-int
+bool
 xg_prepare_tooltip (FRAME_PTR f,
                     Lisp_Object string,
                     int *width,
@@ -725,7 +726,7 @@ xg_prepare_tooltip (FRAME_PTR f,
 
   if (!x->ttip_lbl) return 0;
 
-  BLOCK_INPUT;
+  block_input ();
   encoded_string = ENCODE_UTF_8 (string);
   widget = GTK_WIDGET (x->ttip_lbl);
   gwin = gtk_widget_get_window (GTK_WIDGET (x->ttip_window));
@@ -753,7 +754,7 @@ xg_prepare_tooltip (FRAME_PTR f,
   if (width) *width = req.width;
   if (height) *height = req.height;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return 1;
 #endif /* USE_GTK_TOOLTIP */
@@ -769,27 +770,27 @@ xg_show_tooltip (FRAME_PTR f, int root_x, int root_y)
   struct x_output *x = f->output_data.x;
   if (x->ttip_window)
     {
-      BLOCK_INPUT;
+      block_input ();
       gtk_window_move (x->ttip_window, root_x, root_y);
       gtk_widget_show_all (GTK_WIDGET (x->ttip_window));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif
 }
 
 /* Hide tooltip if shown.  Do nothing if not shown.
-   Return non-zero if tip was hidden, non-zero if not (i.e. not using
+   Return true if tip was hidden, false if not (i.e. not using
    system tooltips).  */
 
-int
+bool
 xg_hide_tooltip (FRAME_PTR f)
 {
-  int ret = 0;
+  bool ret = 0;
 #ifdef USE_GTK_TOOLTIP
   if (f->output_data.x->ttip_window)
     {
       GtkWindow *win = f->output_data.x->ttip_window;
-      BLOCK_INPUT;
+      block_input ();
       gtk_widget_hide (GTK_WIDGET (win));
 
       if (g_object_get_data (G_OBJECT (win), "restore-tt"))
@@ -799,7 +800,7 @@ xg_hide_tooltip (FRAME_PTR f)
           GtkSettings *settings = gtk_settings_get_for_screen (screen);
           g_object_set (settings, "gtk-enable-tooltips", TRUE, NULL);
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       ret = 1;
     }
@@ -1007,7 +1008,7 @@ xg_win_to_widget (Display *dpy, Window wdesc)
   gpointer gdkwin;
   GtkWidget *gwdesc = 0;
 
-  BLOCK_INPUT;
+  block_input ();
 
   gdkwin = gdk_x11_window_lookup_for_display (gdk_x11_lookup_xdisplay (dpy),
                                               wdesc);
@@ -1019,7 +1020,7 @@ xg_win_to_widget (Display *dpy, Window wdesc)
       gwdesc = gtk_get_event_widget (&event);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return gwdesc;
 }
 
@@ -1110,9 +1111,9 @@ delete_cb (GtkWidget *widget,
 }
 
 /* Create and set up the GTK widgets for frame F.
-   Return 0 if creation failed, non-zero otherwise.  */
+   Return true if creation succeeded.  */
 
-int
+bool
 xg_create_frame_widgets (FRAME_PTR f)
 {
   GtkWidget *wtop;
@@ -1123,7 +1124,7 @@ xg_create_frame_widgets (FRAME_PTR f)
 #endif
   char *title = 0;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (FRAME_X_EMBEDDED_P (f))
     {
@@ -1161,7 +1162,7 @@ xg_create_frame_widgets (FRAME_PTR f)
       if (whbox) gtk_widget_destroy (whbox);
       if (wfixed) gtk_widget_destroy (wfixed);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
@@ -1275,7 +1276,7 @@ xg_create_frame_widgets (FRAME_PTR f)
       }
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return 1;
 }
@@ -1309,11 +1310,11 @@ xg_free_frame_widgets (FRAME_PTR f)
 /* Set the normal size hints for the window manager, for frame F.
    FLAGS is the flags word to use--or 0 meaning preserve the flags
    that the window now has.
-   If USER_POSITION is nonzero, we set the User Position
+   If USER_POSITION, set the User Position
    flag (this is useful when FLAGS is 0).  */
 
 void
-x_wm_set_size_hint (FRAME_PTR f, long int flags, int user_position)
+x_wm_set_size_hint (FRAME_PTR f, long int flags, bool user_position)
 {
   /* Must use GTK routines here, otherwise GTK resets the size hints
      to its own defaults.  */
@@ -1397,12 +1398,12 @@ x_wm_set_size_hint (FRAME_PTR f, long int flags, int user_position)
                  &f->output_data.x->size_hints,
                  sizeof (size_hints)) != 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       gtk_window_set_geometry_hints (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
                                      NULL, &size_hints, hint_flags);
       f->output_data.x->size_hints = size_hints;
       f->output_data.x->hint_flags = hint_flags;
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -1417,9 +1418,9 @@ xg_set_background_color (FRAME_PTR f, long unsigned int bg)
 {
   if (FRAME_GTK_WIDGET (f))
     {
-      BLOCK_INPUT;
+      block_input ();
       xg_set_widget_bg (f, FRAME_GTK_WIDGET (f), FRAME_BACKGROUND_PIXEL (f));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -1519,7 +1520,7 @@ create_dialog (widget_value *wv,
 
   /* If the number of buttons is greater than 4, make two rows of buttons
      instead.  This looks better.  */
-  int make_two_rows = total_buttons > 4;
+  bool make_two_rows = total_buttons > 4;
 
   if (right_buttons == 0) right_buttons = total_buttons/2;
   left_buttons = total_buttons - right_buttons;
@@ -1637,14 +1638,14 @@ pop_down_dialog (Lisp_Object arg)
   struct Lisp_Save_Value *p = XSAVE_VALUE (arg);
   struct xg_dialog_data *dd = (struct xg_dialog_data *) p->pointer;
 
-  BLOCK_INPUT;
+  block_input ();
   if (dd->w) gtk_widget_destroy (dd->w);
   if (dd->timerid != 0) g_source_remove (dd->timerid);
 
   g_main_loop_quit (dd->loop);
   g_main_loop_unref (dd->loop);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -1716,10 +1717,9 @@ xg_dialog_run (FRAME_PTR f, GtkWidget *w)
 /***********************************************************************
                       File dialog functions
  ***********************************************************************/
-/* Return non-zero if the old file selection dialog is being used.
-   Return zero if not.  */
+/* Return true if the old file selection dialog is being used.  */
 
-int
+bool
 xg_uses_old_file_dialog (void)
 {
 #ifdef HAVE_GTK_FILE_SELECTION_NEW
@@ -1790,7 +1790,7 @@ xg_toggle_notify_cb (GObject *gobject, GParamSpec *arg1, gpointer user_data)
    F is the current frame.
    PROMPT is a prompt to show to the user.  May not be NULL.
    DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
-   If MUSTMATCH_P is non-zero, the returned file name must be an existing
+   If MUSTMATCH_P, the returned file name must be an existing
    file.  (Actually, this only has cosmetic effects, the user can
    still enter a non-existing file.)  *FUNC is set to a function that
    can be used to retrieve the selected file name from the returned widget.
@@ -1801,7 +1801,7 @@ static GtkWidget *
 xg_get_file_with_chooser (FRAME_PTR f,
                           char *prompt,
                           char *default_filename,
-                          int mustmatch_p, int only_dir_p,
+                          bool mustmatch_p, bool only_dir_p,
                           xg_get_file_func *func)
 {
   char msgbuf[1024];
@@ -1913,7 +1913,7 @@ xg_get_file_name_from_selector (GtkWidget *w)
    F is the current frame.
    PROMPT is a prompt to show to the user.  May not be NULL.
    DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
-   If MUSTMATCH_P is non-zero, the returned file name must be an existing
+   If MUSTMATCH_P, the returned file name must be an existing
    file.  *FUNC is set to a function that can be used to retrieve the
    selected file name from the returned widget.
 
@@ -1923,7 +1923,7 @@ static GtkWidget *
 xg_get_file_with_selection (FRAME_PTR f,
                             char *prompt,
                             char *default_filename,
-                            int mustmatch_p, int only_dir_p,
+                            bool mustmatch_p, bool only_dir_p,
                             xg_get_file_func *func)
 {
   GtkWidget *filewin;
@@ -1955,7 +1955,7 @@ xg_get_file_with_selection (FRAME_PTR f,
    F is the current frame.
    PROMPT is a prompt to show to the user.  May not be NULL.
    DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
-   If MUSTMATCH_P is non-zero, the returned file name must be an existing
+   If MUSTMATCH_P, the returned file name must be an existing
    file.
 
    Returns a file name or NULL if no file was selected.
@@ -1965,24 +1965,14 @@ char *
 xg_get_file_name (FRAME_PTR f,
                   char *prompt,
                   char *default_filename,
-                  int mustmatch_p,
-                  int only_dir_p)
+                  bool mustmatch_p,
+                  bool only_dir_p)
 {
   GtkWidget *w = 0;
   char *fn = 0;
   int filesel_done = 0;
   xg_get_file_func func;
 
-#if defined (HAVE_PTHREAD) && defined (__SIGRTMIN)
-  /* I really don't know why this is needed, but without this the GLIBC add on
-     library linuxthreads hangs when the Gnome file chooser backend creates
-     threads.  */
-  sigset_t blocked;
-  sigemptyset (&blocked);
-  sigaddset (&blocked, __SIGRTMIN);
-  pthread_sigmask (SIG_BLOCK, &blocked, 0);
-#endif /* HAVE_PTHREAD */
-
 #ifdef HAVE_GTK_FILE_SELECTION_NEW
 
   if (xg_uses_old_file_dialog ())
@@ -2000,11 +1990,6 @@ xg_get_file_name (FRAME_PTR f,
   gtk_widget_set_name (w, "emacs-filedialog");
 
   filesel_done = xg_dialog_run (f, w);
-
-#if defined (HAVE_PTHREAD) && defined (__SIGRTMIN)
-  pthread_sigmask (SIG_UNBLOCK, &blocked, 0);
-#endif
-
   if (filesel_done == GTK_RESPONSE_OK)
     fn = (*func) (w);
 
@@ -2057,13 +2042,6 @@ xg_get_font (FRAME_PTR f, const char *default_name)
   int done = 0;
   Lisp_Object font = Qnil;
 
-#if defined (HAVE_PTHREAD) && defined (__SIGRTMIN)
-  sigset_t blocked;
-  sigemptyset (&blocked);
-  sigaddset (&blocked, __SIGRTMIN);
-  pthread_sigmask (SIG_BLOCK, &blocked, 0);
-#endif /* HAVE_PTHREAD */
-
   w = gtk_font_chooser_dialog_new
     ("Pick a font", GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)));
 
@@ -2088,11 +2066,6 @@ xg_get_font (FRAME_PTR f, const char *default_name)
 
   gtk_widget_set_name (w, "emacs-fontdialog");
   done = xg_dialog_run (f, w);
-
-#if defined (HAVE_PTHREAD) && defined (__SIGRTMIN)
-  pthread_sigmask (SIG_UNBLOCK, &blocked, 0);
-#endif
-
   if (done == GTK_RESPONSE_OK)
     {
 #if USE_NEW_GTK_FONT_CHOOSER
@@ -2430,9 +2403,9 @@ make_menu_item (const char *utf8_label,
 
 static int xg_detached_menus;
 
-/* Returns non-zero if there are detached menus.  */
+/* Return true if there are detached menus.  */
 
-int
+bool
 xg_have_tear_offs (void)
 {
   return xg_detached_menus > 0;
@@ -2536,10 +2509,9 @@ xg_create_one_menuitem (widget_value *item,
    SELECT_CB is the callback to use when a menu item is selected.
    DEACTIVATE_CB is the callback to use when a sub menu is not shown anymore.
    HIGHLIGHT_CB is the callback to call when entering/leaving menu items.
-   POP_UP_P is non-zero if we shall create a popup menu.
-   MENU_BAR_P is non-zero if we shall create a menu bar.
-   ADD_TEAROFF_P is non-zero if we shall add a tearoff menu item.  Ignored
-   if MENU_BAR_P is non-zero.
+   If POP_UP_P, create a popup menu.
+   If MENU_BAR_P, create a menu bar.
+   If ADD_TEAROFF_P, add a tearoff menu item.  Ignored if MENU_BAR_P.
    TOPMENU is the topmost GtkWidget that others shall be placed under.
    It may be NULL, in that case we create the appropriate widget
    (menu bar or menu item depending on POP_UP_P and MENU_BAR_P)
@@ -2559,9 +2531,9 @@ create_menus (widget_value *data,
               GCallback select_cb,
               GCallback deactivate_cb,
               GCallback highlight_cb,
-              int pop_up_p,
-              int menu_bar_p,
-              int add_tearoff_p,
+              bool pop_up_p,
+              bool menu_bar_p,
+              bool add_tearoff_p,
               GtkWidget *topmenu,
               xg_menu_cb_data *cl_data,
               const char *name)
@@ -2701,8 +2673,8 @@ xg_create_widget (const char *type, const char *name, FRAME_PTR f, widget_value
                   GCallback highlight_cb)
 {
   GtkWidget *w = 0;
-  int menu_bar_p = strcmp (type, "menubar") == 0;
-  int pop_up_p = strcmp (type, "popup") == 0;
+  bool menu_bar_p = strcmp (type, "menubar") == 0;
+  bool pop_up_p = strcmp (type, "popup") == 0;
 
   if (strcmp (type, "dialog") == 0)
     {
@@ -2755,12 +2727,12 @@ xg_get_menu_item_label (GtkMenuItem *witem)
   return gtk_label_get_label (wlabel);
 }
 
-/* Return non-zero if the menu item WITEM has the text LABEL.  */
+/* Return true if the menu item WITEM has the text LABEL.  */
 
-static int
+static bool
 xg_item_label_same_p (GtkMenuItem *witem, const char *label)
 {
-  int is_same = 0;
+  bool is_same = 0;
   char *utf8_label = get_utf8_string (label);
   const char *old_label = witem ? xg_get_menu_item_label (witem) : 0;
 
@@ -2851,8 +2823,8 @@ xg_update_menubar (GtkWidget *menubar,
     {
       GtkMenuItem *witem = GTK_MENU_ITEM (iter->data);
       GtkMenuItem *witem2 = 0;
-      int val_in_menubar = 0;
-      int iter_in_new_menubar = 0;
+      bool val_in_menubar = 0;
+      bool iter_in_new_menubar = 0;
       GList *iter2;
       widget_value *cur;
 
@@ -3130,7 +3102,7 @@ xg_update_submenu (GtkWidget *submenu,
   GList *list = 0;
   GList *iter;
   widget_value *cur;
-  int has_tearoff_p = 0;
+  bool has_tearoff_p = 0;
   GList *first_radio = 0;
 
   if (submenu)
@@ -3252,7 +3224,7 @@ xg_update_submenu (GtkWidget *submenu,
 /* Update the MENUBAR.
    F is the frame the menu bar belongs to.
    VAL describes the contents of the menu bar.
-   If DEEP_P is non-zero, rebuild all but the top level menu names in
+   If DEEP_P, rebuild all but the top level menu names in
    the MENUBAR.  If DEEP_P is zero, just rebuild the names in the menubar.
    SELECT_CB is the callback to use when a menu item is selected.
    DEACTIVATE_CB is the callback to use when a sub menu is not shown anymore.
@@ -3260,7 +3232,7 @@ xg_update_submenu (GtkWidget *submenu,
 
 void
 xg_modify_menubar_widgets (GtkWidget *menubar, FRAME_PTR f, widget_value *val,
-                           int deep_p,
+                           bool deep_p,
                            GCallback select_cb, GCallback deactivate_cb,
                            GCallback highlight_cb)
 {
@@ -3344,21 +3316,21 @@ menubar_map_cb (GtkWidget *w, gpointer user_data)
 }
 
 /* Recompute all the widgets of frame F, when the menu bar has been
-   changed.  Value is non-zero if widgets were updated.  */
+   changed.  */
 
-int
+void
 xg_update_frame_menubar (FRAME_PTR f)
 {
   struct x_output *x = f->output_data.x;
   GtkRequisition req;
 
   if (!x->menubar_widget || gtk_widget_get_mapped (x->menubar_widget))
-    return 0;
+    return;
 
   if (x->menubar_widget && gtk_widget_get_parent (x->menubar_widget))
-    return 0; /* Already done this, happens for frames created invisible.  */
+    return; /* Already done this, happens for frames created invisible.  */
 
-  BLOCK_INPUT;
+  block_input ();
 
   gtk_box_pack_start (GTK_BOX (x->vbox_widget), x->menubar_widget,
                       FALSE, FALSE, 0);
@@ -3378,9 +3350,7 @@ xg_update_frame_menubar (FRAME_PTR f)
       FRAME_MENUBAR_HEIGHT (f) = req.height;
       xg_height_or_width_changed (f);
     }
-  UNBLOCK_INPUT;
-
-  return 1;
+  unblock_input ();
 }
 
 /* Get rid of the menu bar of frame F, and free its storage.
@@ -3393,7 +3363,7 @@ free_frame_menubar (FRAME_PTR f)
 
   if (x->menubar_widget)
     {
-      BLOCK_INPUT;
+      block_input ();
 
       gtk_container_remove (GTK_CONTAINER (x->vbox_widget), x->menubar_widget);
        /* The menubar and its children shall be deleted when removed from
@@ -3401,11 +3371,11 @@ free_frame_menubar (FRAME_PTR f)
       x->menubar_widget = 0;
       FRAME_MENUBAR_HEIGHT (f) = 0;
       xg_height_or_width_changed (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
-int
+bool
 xg_event_is_for_menubar (FRAME_PTR f, XEvent *event)
 {
   struct x_output *x = f->output_data.x;
@@ -3452,7 +3422,7 @@ xg_event_is_for_menubar (FRAME_PTR f, XEvent *event)
         break;
     }
   g_list_free (list);
-  return iter == 0 ? 0 : 1;
+  return iter != 0;
 }
 
 
@@ -3465,7 +3435,7 @@ xg_event_is_for_menubar (FRAME_PTR f, XEvent *event)
 /* Setting scroll bar values invokes the callback.  Use this variable
    to indicate that callback should do nothing.  */
 
-int xg_ignore_gtk_scrollbar;
+bool xg_ignore_gtk_scrollbar;
 
 /* The width of the scroll bar for the current theme.  */
 
@@ -3791,7 +3761,7 @@ xg_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar,
       int size, value;
       int old_size;
       int new_step;
-      int changed = 0;
+      bool changed = 0;
 
       adj = gtk_range_get_adjustment (GTK_RANGE (wscroll));
 
@@ -3838,7 +3808,7 @@ xg_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar,
 
       if (changed || int_gtk_range_get_value (GTK_RANGE (wscroll)) != value)
       {
-        BLOCK_INPUT;
+        block_input ();
 
         /* gtk_range_set_value invokes the callback.  Set
            ignore_gtk_scrollbar to make the callback do nothing  */
@@ -3851,22 +3821,20 @@ xg_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar,
 
         xg_ignore_gtk_scrollbar = 0;
 
-        UNBLOCK_INPUT;
+        unblock_input ();
       }
     }
 }
 
-/* Return non-zero if EVENT is for a scroll bar in frame F.
+/* Return true if EVENT is for a scroll bar in frame F.
    When the same X window is used for several Gtk+ widgets, we cannot
    say for sure based on the X window alone if an event is for the
-   frame.  This function does additional checks.
+   frame.  This function does additional checks.  */
 
-   Return non-zero if the event is for a scroll bar, zero otherwise.  */
-
-int
+bool
 xg_event_is_for_scrollbar (FRAME_PTR f, XEvent *event)
 {
-  int retval = 0;
+  bool retval = 0;
 
   if (f && event->type == ButtonPress && event->xbutton.button < 4)
     {
@@ -4297,7 +4265,7 @@ static void
 xg_pack_tool_bar (FRAME_PTR f, Lisp_Object pos)
 {
   struct x_output *x = f->output_data.x;
-  int into_hbox = EQ (pos, Qleft) || EQ (pos, Qright);
+  bool into_hbox = EQ (pos, Qleft) || EQ (pos, Qright);
 
   toolbar_set_orientation (x->toolbar_widget,
                            into_hbox
@@ -4329,7 +4297,7 @@ xg_pack_tool_bar (FRAME_PTR f, Lisp_Object pos)
     }
   else
     {
-      int vbox_pos = x->menubar_widget ? 1 : 0;
+      bool vbox_pos = x->menubar_widget != 0;
       gtk_handle_box_set_handle_position (GTK_HANDLE_BOX (x->handlebox_widget),
                                           GTK_POS_LEFT);
       gtk_box_pack_start (GTK_BOX (x->vbox_widget), x->handlebox_widget,
@@ -4420,7 +4388,7 @@ xg_make_tool_item (FRAME_PTR f,
                    GtkWidget *wimage,
                    GtkWidget **wbutton,
                    const char *label,
-                   int i, int horiz, int text_image)
+                   int i, bool horiz, bool text_image)
 {
   GtkToolItem *ti = gtk_tool_item_new ();
   GtkWidget *vb = gtk_box_new (horiz
@@ -4515,11 +4483,11 @@ xg_make_tool_item (FRAME_PTR f,
   return ti;
 }
 
-static int
-is_box_type (GtkWidget *vb, int is_horizontal)
+static bool
+is_box_type (GtkWidget *vb, bool is_horizontal)
 {
 #ifdef HAVE_GTK3
-  int ret = 0;
+  bool ret = 0;
   if (GTK_IS_BOX (vb))
     {
       GtkOrientation ori = gtk_orientable_get_orientation (GTK_ORIENTABLE (vb));
@@ -4533,10 +4501,10 @@ is_box_type (GtkWidget *vb, int is_horizontal)
 }
 
 
-static int
+static bool
 xg_tool_item_stale_p (GtkWidget *wbutton, const char *stock_name,
                       const char *icon_name, const struct image *img,
-                      const char *label, int horiz)
+                      const char *label, bool horiz)
 {
   gpointer old;
   GtkWidget *wimage;
@@ -4578,7 +4546,7 @@ xg_tool_item_stale_p (GtkWidget *wbutton, const char *stock_name,
   return 0;
 }
 
-static int
+static bool
 xg_update_tool_bar_sizes (FRAME_PTR f)
 {
   struct x_output *x = f->output_data.x;
@@ -4634,15 +4602,15 @@ update_frame_tool_bar (FRAME_PTR f)
   GtkToolbar *wtoolbar;
   GtkToolItem *ti;
   GtkTextDirection dir;
-  int pack_tool_bar = x->handlebox_widget == NULL;
+  bool pack_tool_bar = x->handlebox_widget == NULL;
   Lisp_Object style;
-  int text_image, horiz;
+  bool text_image, horiz;
   struct xg_frame_tb_info *tbinfo;
 
   if (! FRAME_GTK_WIDGET (f))
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (RANGED_INTEGERP (1, Vtool_bar_button_margin, INT_MAX))
     {
@@ -4684,7 +4652,7 @@ update_frame_tool_bar (FRAME_PTR f)
       && ! NILP (Fequal (tbinfo->style, style))
       && ! NILP (Fequal (tbinfo->last_tool_bar, f->tool_bar_items)))
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
@@ -4700,8 +4668,8 @@ update_frame_tool_bar (FRAME_PTR f)
 
   for (i = j = 0; i < f->n_tool_bar_items; ++i)
     {
-      int enabled_p = !NILP (PROP (TOOL_BAR_ITEM_ENABLED_P));
-      int selected_p = !NILP (PROP (TOOL_BAR_ITEM_SELECTED_P));
+      bool enabled_p = !NILP (PROP (TOOL_BAR_ITEM_ENABLED_P));
+      bool selected_p = !NILP (PROP (TOOL_BAR_ITEM_SELECTED_P));
       int idx;
       ptrdiff_t img_id;
       int icon_size = 0;
@@ -4714,7 +4682,7 @@ update_frame_tool_bar (FRAME_PTR f)
       Lisp_Object rtl;
       GtkWidget *wbutton = NULL;
       Lisp_Object specified_file;
-      int vert_only = ! NILP (PROP (TOOL_BAR_ITEM_VERT_ONLY));
+      bool vert_only = ! NILP (PROP (TOOL_BAR_ITEM_VERT_ONLY));
       const char *label
         = (EQ (style, Qimage) || (vert_only && horiz)) ? NULL
         : STRINGP (PROP (TOOL_BAR_ITEM_LABEL))
@@ -4895,7 +4863,7 @@ update_frame_tool_bar (FRAME_PTR f)
         xg_height_or_width_changed (f);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Deallocate all resources for the tool bar on frame F.
@@ -4909,8 +4877,8 @@ free_frame_tool_bar (FRAME_PTR f)
   if (x->toolbar_widget)
     {
       struct xg_frame_tb_info *tbinfo;
-      int is_packed = x->handlebox_widget != 0;
-      BLOCK_INPUT;
+      bool is_packed = x->handlebox_widget != 0;
+      block_input ();
       /* We may have created the toolbar_widget in xg_create_tool_bar, but
          not the x->handlebox_widget which is created in xg_pack_tool_bar.  */
       if (is_packed)
@@ -4942,19 +4910,19 @@ free_frame_tool_bar (FRAME_PTR f)
 
       xg_height_or_width_changed (f);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
-int
+void
 xg_change_toolbar_position (FRAME_PTR f, Lisp_Object pos)
 {
   struct x_output *x = f->output_data.x;
 
   if (! x->toolbar_widget || ! x->handlebox_widget)
-    return 1;
+    return;
 
-  BLOCK_INPUT;
+  block_input ();
   g_object_ref (x->handlebox_widget);
   if (x->toolbar_in_hbox)
     gtk_container_remove (GTK_CONTAINER (x->hbox_widget),
@@ -4967,8 +4935,7 @@ xg_change_toolbar_position (FRAME_PTR f, Lisp_Object pos)
   if (xg_update_tool_bar_sizes (f))
     xg_height_or_width_changed (f);
 
-  UNBLOCK_INPUT;
-  return 1;
+  unblock_input ();
 }
 
 
diff --git a/src/gtkutil.h b/src/gtkutil.h
index 926478dd728..43f2b237a68 100644
--- a/src/gtkutil.h
+++ b/src/gtkutil.h
@@ -79,13 +79,13 @@ struct _widget_value;
 extern struct _widget_value *malloc_widget_value (void);
 extern void free_widget_value (struct _widget_value *);
 
-extern int xg_uses_old_file_dialog (void) ATTRIBUTE_CONST;
+extern bool xg_uses_old_file_dialog (void) ATTRIBUTE_CONST;
 
 extern char *xg_get_file_name (FRAME_PTR f,
                                char *prompt,
                                char *default_filename,
-                               int mustmatch_p,
-                               int only_dir_p);
+                               bool mustmatch_p,
+                               bool only_dir_p);
 
 extern Lisp_Object xg_get_font (FRAME_PTR f, const char *);
 
@@ -100,16 +100,16 @@ extern GtkWidget *xg_create_widget (const char *type,
 extern void xg_modify_menubar_widgets (GtkWidget *menubar,
                                        FRAME_PTR f,
                                        struct _widget_value *val,
-                                       int deep_p,
+                                       bool deep_p,
                                        GCallback select_cb,
                                        GCallback deactivate_cb,
                                        GCallback highlight_cb);
 
-extern int xg_update_frame_menubar (FRAME_PTR f);
+extern void xg_update_frame_menubar (FRAME_PTR f);
 
-extern int xg_event_is_for_menubar (FRAME_PTR f, XEvent *event);
+extern bool xg_event_is_for_menubar (FRAME_PTR f, XEvent *event);
 
-extern int xg_have_tear_offs (void);
+extern bool xg_have_tear_offs (void);
 
 extern ptrdiff_t xg_get_scroll_id_for_window (Display *dpy, Window wid);
 
@@ -131,12 +131,12 @@ extern void xg_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar,
                                              int portion,
                                              int position,
                                              int whole);
-extern int xg_event_is_for_scrollbar (FRAME_PTR f, XEvent *event);
+extern bool xg_event_is_for_scrollbar (FRAME_PTR f, XEvent *event);
 extern int xg_get_default_scrollbar_width (void);
 
 extern void update_frame_tool_bar (FRAME_PTR f);
 extern void free_frame_tool_bar (FRAME_PTR f);
-extern int xg_change_toolbar_position (FRAME_PTR f, Lisp_Object pos);
+extern void xg_change_toolbar_position (FRAME_PTR f, Lisp_Object pos);
 
 extern void xg_frame_resized (FRAME_PTR f,
                               int pixelwidth,
@@ -148,23 +148,23 @@ extern void xg_display_open (char *display_name, Display **dpy);
 extern void xg_display_close (Display *dpy);
 extern GdkCursor * xg_create_default_cursor (Display *dpy);
 
-extern int xg_create_frame_widgets (FRAME_PTR f);
+extern bool xg_create_frame_widgets (FRAME_PTR f);
 extern void xg_free_frame_widgets (FRAME_PTR f);
 extern void xg_set_background_color (FRAME_PTR f, unsigned long bg);
-extern int xg_check_special_colors (struct frame *f,
-                                    const char *color_name,
-                                    XColor *color);
+extern bool xg_check_special_colors (struct frame *f,
+                                     const char *color_name,
+                                     XColor *color);
 
 extern void xg_set_frame_icon (FRAME_PTR f,
                                Pixmap icon_pixmap,
                                Pixmap icon_mask);
 
-extern int xg_prepare_tooltip (FRAME_PTR f,
-                               Lisp_Object string,
-                               int *width,
-                               int *height);
+extern bool xg_prepare_tooltip (FRAME_PTR f,
+                                Lisp_Object string,
+                                int *width,
+                                int *height);
 extern void xg_show_tooltip (FRAME_PTR f, int root_x, int root_y);
-extern int xg_hide_tooltip (FRAME_PTR f);
+extern bool xg_hide_tooltip (FRAME_PTR f);
 
 
 /* Mark all callback data that are Lisp_object:s during GC.  */
@@ -175,7 +175,7 @@ extern void xg_initialize (void);
 
 /* Setting scrollbar values invokes the callback.  Use this variable
    to indicate that the callback should do nothing.  */
-extern int xg_ignore_gtk_scrollbar;
+extern bool xg_ignore_gtk_scrollbar;
 
 #endif /* USE_GTK */
 #endif /* GTKUTIL_H */
diff --git a/src/image.c b/src/image.c
index 0060d0d4148..7901b95f236 100644
--- a/src/image.c
+++ b/src/image.c
@@ -407,9 +407,9 @@ x_destroy_bitmap (FRAME_PTR f, ptrdiff_t id)
 
       if (--bm->refcount == 0)
         {
-          BLOCK_INPUT;
+          block_input ();
           free_bitmap_record (dpyinfo, bm);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
 }
@@ -429,6 +429,9 @@ x_destroy_all_bitmaps (Display_Info *dpyinfo)
   dpyinfo->bitmaps_last = 0;
 }
 
+static bool x_create_x_image_and_pixmap (struct frame *, int, int, int,
+                                         XImagePtr *, Pixmap *);
+static void x_destroy_x_image (XImagePtr ximg);
 
 #ifdef HAVE_X_WINDOWS
 
@@ -440,23 +443,17 @@ static unsigned long four_corners_best (XImagePtr ximg,
                                         unsigned long width,
                                         unsigned long height);
 
-static int x_create_x_image_and_pixmap (struct frame *f, int width, int height,
-                                        int depth, XImagePtr *ximg,
-                                        Pixmap *pixmap);
-
-static void x_destroy_x_image (XImagePtr ximg);
-
 
 /* Create a mask of a bitmap. Note is this not a perfect mask.
    It's nicer with some borders in this context */
 
-int
+void
 x_create_bitmap_mask (struct frame *f, ptrdiff_t id)
 {
   Pixmap pixmap, mask;
   XImagePtr ximg, mask_img;
   unsigned long width, height;
-  int result;
+  bool result;
   unsigned long bg;
   unsigned long x, y, xp, xm, yp, ym;
   GC gc;
@@ -464,29 +461,29 @@ x_create_bitmap_mask (struct frame *f, ptrdiff_t id)
   Display_Info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
 
   if (!(id > 0))
-    return -1;
+    return;
 
   pixmap = x_bitmap_pixmap (f, id);
   width = x_bitmap_width (f, id);
   height = x_bitmap_height (f, id);
 
-  BLOCK_INPUT;
+  block_input ();
   ximg = XGetImage (FRAME_X_DISPLAY (f), pixmap, 0, 0, width, height,
                     ~0, ZPixmap);
 
   if (!ximg)
     {
-      UNBLOCK_INPUT;
-      return -1;
+      unblock_input ();
+      return;
     }
 
   result = x_create_x_image_and_pixmap (f, width, height, 1, &mask_img, &mask);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (!result)
     {
       XDestroyImage (ximg);
-      return -1;
+      return;
     }
 
   bg = four_corners_best (ximg, NULL, width, height);
@@ -514,7 +511,7 @@ x_create_bitmap_mask (struct frame *f, ptrdiff_t id)
         }
     }
 
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
   gc = XCreateGC (FRAME_X_DISPLAY (f), mask, 0, NULL);
   XPutImage (FRAME_X_DISPLAY (f), mask, gc, mask_img, 0, 0, 0, 0,
              width, height);
@@ -525,8 +522,6 @@ x_create_bitmap_mask (struct frame *f, ptrdiff_t id)
 
   XDestroyImage (ximg);
   x_destroy_x_image (mask_img);
-
-  return 0;
 }
 
 #endif /* HAVE_X_WINDOWS */
@@ -559,15 +554,13 @@ static Lisp_Object QCcrop, QCrotation;
 static Lisp_Object Qcount, Qextension_data, Qdelay;
 static Lisp_Object Qlaplace, Qemboss, Qedge_detection, Qheuristic;
 
-/* Function prototypes.  */
+/* Forward function prototypes.  */
 
-static struct image_type *define_image_type (struct image_type *, Lisp_Object);
-static struct image_type *lookup_image_type (Lisp_Object, Lisp_Object);
-static void image_error (const char *format, Lisp_Object, Lisp_Object);
+static struct image_type *lookup_image_type (Lisp_Object);
 static void x_laplace (struct frame *, struct image *);
 static void x_emboss (struct frame *, struct image *);
-static int x_build_heuristic_mask (struct frame *, struct image *,
-                                   Lisp_Object);
+static void x_build_heuristic_mask (struct frame *, struct image *,
+                                    Lisp_Object);
 #ifdef HAVE_NTGUI
 #define CACHE_IMAGE_TYPE(type, status) \
   do { Vlibrary_cache = Fcons (Fcons (type, status), Vlibrary_cache); } while (0)
@@ -579,21 +572,16 @@ static int x_build_heuristic_mask (struct frame *, struct image *,
   do { Vimage_types = Fcons (type, Vimage_types); } while (0)
 
 /* Define a new image type from TYPE.  This adds a copy of TYPE to
-   image_types and caches the loading status of TYPE.
-
-   LIBRARIES is an alist associating dynamic libraries to external
-   files implementing them, which is passed to the image library
-   initialization function if necessary.  A nil value defaults to
-   Vdynamic_library_alist.  */
+   image_types and caches the loading status of TYPE.  */
 
 static struct image_type *
-define_image_type (struct image_type *type, Lisp_Object libraries)
+define_image_type (struct image_type *type)
 {
   struct image_type *p = NULL;
   Lisp_Object target_type = *type->type;
-  int type_valid = 1;
+  bool type_valid = 1;
 
-  BLOCK_INPUT;
+  block_input ();
 
   for (p = image_types; p; p = p->next)
     if (EQ (*p->type, target_type))
@@ -609,7 +597,7 @@ define_image_type (struct image_type *type, Lisp_Object libraries)
       else
 #endif
         {
-          type_valid = type->init (libraries);
+          type_valid = type->init ();
           CACHE_IMAGE_TYPE (target_type, type_valid ? Qt : Qnil);
         }
     }
@@ -625,22 +613,22 @@ define_image_type (struct image_type *type, Lisp_Object libraries)
     }
 
  done:
-  UNBLOCK_INPUT;
+  unblock_input ();
   return p;
 }
 
 
-/* Value is non-zero if OBJECT is a valid Lisp image specification.  A
+/* Value is true if OBJECT is a valid Lisp image specification.  A
    valid image specification is a list whose car is the symbol
    `image', and whose rest is a property list.  The property list must
    contain a value for key `:type'.  That value must be the name of a
    supported image type.  The rest of the property list depends on the
    image type.  */
 
-int
+bool
 valid_image_p (Lisp_Object object)
 {
-  int valid_p = 0;
+  bool valid_p = 0;
 
   if (IMAGEP (object))
     {
@@ -653,7 +641,7 @@ valid_image_p (Lisp_Object object)
             if (CONSP (tem) && SYMBOLP (XCAR (tem)))
               {
                 struct image_type *type;
-                type = lookup_image_type (XCAR (tem), Qnil);
+                type = lookup_image_type (XCAR (tem));
                 if (type)
                   valid_p = type->valid_p (object);
               }
@@ -710,8 +698,8 @@ struct image_keyword
   /* The type of value allowed.  */
   enum image_value_type type;
 
-  /* Non-zero means key must be present.  */
-  int mandatory_p;
+  /* True means key must be present.  */
+  bool mandatory_p;
 
   /* Used to recognize duplicate keywords in a property list.  */
   int count;
@@ -721,18 +709,13 @@ struct image_keyword
 };
 
 
-static int parse_image_spec (Lisp_Object, struct image_keyword *,
-                             int, Lisp_Object);
-static Lisp_Object image_spec_value (Lisp_Object, Lisp_Object, int *);
-
-
 /* Parse image spec SPEC according to KEYWORDS.  A valid image spec
    has the format (image KEYWORD VALUE ...).  One of the keyword/
    value pairs must be `:type TYPE'.  KEYWORDS is a vector of
    image_keywords structures of size NKEYWORDS describing other
-   allowed keyword/value pairs.  Value is non-zero if SPEC is valid.  */
+   allowed keyword/value pairs.  Value is true if SPEC is valid.  */
 
-static int
+static bool
 parse_image_spec (Lisp_Object spec, struct image_keyword *keywords,
                   int nkeywords, Lisp_Object type)
 {
@@ -864,11 +847,11 @@ parse_image_spec (Lisp_Object spec, struct image_keyword *keywords,
 
 
 /* Return the value of KEY in image specification SPEC.  Value is nil
-   if KEY is not present in SPEC.  if FOUND is not null, set *FOUND
-   to 1 if KEY was found in SPEC, set it to 0 otherwise.  */
+   if KEY is not present in SPEC.  Set *FOUND depending on whether KEY
+   was found in SPEC.  */
 
 static Lisp_Object
-image_spec_value (Lisp_Object spec, Lisp_Object key, int *found)
+image_spec_value (Lisp_Object spec, Lisp_Object key, bool *found)
 {
   Lisp_Object tail;
 
@@ -972,8 +955,6 @@ or omitted means use the selected frame.  */)
                  Image type independent image structures
  ***********************************************************************/
 
-static void free_image (struct frame *f, struct image *img);
-
 #define MAX_IMAGE_SIZE 10.0
 /* Allocate and return a new image structure for image specification
    SPEC.  SPEC has a hash value of HASH.  */
@@ -986,7 +967,7 @@ make_image (Lisp_Object spec, EMACS_UINT hash)
 
   eassert (valid_image_p (spec));
   img->dependencies = NILP (file) ? Qnil : list1 (file);
-  img->type = lookup_image_type (image_spec_value (spec, QCtype, NULL), Qnil);
+  img->type = lookup_image_type (image_spec_value (spec, QCtype, NULL));
   eassert (img->type != NULL);
   img->spec = spec;
   img->lisp_data = Qnil;
@@ -1023,10 +1004,9 @@ free_image (struct frame *f, struct image *img)
     }
 }
 
-/* Return 1 if the given widths and heights are valid for display;
-   otherwise, return 0. */
+/* Return true if the given widths and heights are valid for display.  */
 
-static int
+static bool
 check_image_size (struct frame *f, int width, int height)
 {
   int w, h;
@@ -1065,7 +1045,7 @@ prepare_image_for_display (struct frame *f, struct image *img)
   /* If IMG doesn't have a pixmap yet, load it now, using the image
      type dependent loader function.  */
   if (img->pixmap == NO_PIXMAP && !img->load_failed_p)
-    img->load_failed_p = img->type->load (f, img) == 0;
+    img->load_failed_p = ! img->type->load (f, img);
 
 }
 
@@ -1198,7 +1178,7 @@ image_background (struct image *img, struct frame *f, XImagePtr_or_DC ximg)
   if (! img->background_valid)
     /* IMG doesn't have a background yet, try to guess a reasonable value.  */
     {
-      int free_ximg = !ximg;
+      bool free_ximg = !ximg;
 #ifdef HAVE_NTGUI
       HGDIOBJ prev;
 #endif /* HAVE_NTGUI */
@@ -1239,7 +1219,7 @@ image_background_transparent (struct image *img, struct frame *f, XImagePtr_or_D
     {
       if (img->mask)
         {
-          int free_mask = !mask;
+          bool free_mask = !mask;
 #ifdef HAVE_NTGUI
           HGDIOBJ prev;
 #endif /* HAVE_NTGUI */
@@ -1277,23 +1257,13 @@ image_background_transparent (struct image *img, struct frame *f, XImagePtr_or_D
                   Helper functions for X image types
  ***********************************************************************/
 
-static void x_clear_image_1 (struct frame *, struct image *, int,
-                             int, int);
-static void x_clear_image (struct frame *f, struct image *img);
-static unsigned long x_alloc_image_color (struct frame *f,
-                                          struct image *img,
-                                          Lisp_Object color_name,
-                                          unsigned long dflt);
-
-
-/* Clear X resources of image IMG on frame F.  PIXMAP_P non-zero means
-   free the pixmap if any.  MASK_P non-zero means clear the mask
-   pixmap if any.  COLORS_P non-zero means free colors allocated for
-   the image, if any.  */
+/* Clear X resources of image IMG on frame F.  PIXMAP_P means free the
+   pixmap if any.  MASK_P means clear the mask pixmap if any.
+   COLORS_P means free colors allocated for the image, if any.  */
 
 static void
-x_clear_image_1 (struct frame *f, struct image *img, int pixmap_p, int mask_p,
-                 int colors_p)
+x_clear_image_1 (struct frame *f, struct image *img, bool pixmap_p,
+                 bool mask_p, bool colors_p)
 {
   if (pixmap_p && img->pixmap)
     {
@@ -1328,9 +1298,9 @@ x_clear_image_1 (struct frame *f, struct image *img, int pixmap_p, int mask_p,
 static void
 x_clear_image (struct frame *f, struct image *img)
 {
-  BLOCK_INPUT;
+  block_input ();
   x_clear_image_1 (f, img, 1, 1, 1);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1373,7 +1343,6 @@ x_alloc_image_color (struct frame *f, struct image *img, Lisp_Object color_name,
  ***********************************************************************/
 
 static void cache_image (struct frame *f, struct image *img);
-static void postprocess_image (struct frame *, struct image *);
 
 /* Return a new, initialized image cache that is allocated from the
    heap.  Call free_image_cache to free an image cache.  */
@@ -1485,7 +1454,7 @@ clear_image_cache (struct frame *f, Lisp_Object filter)
 
       /* Block input so that we won't be interrupted by a SIGIO
          while being in an inconsistent state.  */
-      BLOCK_INPUT;
+      block_input ();
 
       if (!NILP (filter))
         {
@@ -1551,7 +1520,7 @@ clear_image_cache (struct frame *f, Lisp_Object filter)
           ++windows_or_buffers_changed;
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -1646,7 +1615,7 @@ postprocess_image (struct frame *f, struct image *img)
         x_build_heuristic_mask (f, img, mask);
       else
         {
-          int found_p;
+          bool found_p;
 
           mask = image_spec_value (spec, QCmask, &found_p);
 
@@ -1716,10 +1685,10 @@ lookup_image (struct frame *f, Lisp_Object spec)
   /* If not found, create a new image and cache it.  */
   if (img == NULL)
     {
-      BLOCK_INPUT;
+      block_input ();
       img = make_image (spec, hash);
       cache_image (f, img);
-      img->load_failed_p = img->type->load (f, img) == 0;
+      img->load_failed_p = ! img->type->load (f, img);
       img->frame_foreground = FRAME_FOREGROUND_PIXEL (f);
       img->frame_background = FRAME_BACKGROUND_PIXEL (f);
 
@@ -1787,7 +1756,7 @@ lookup_image (struct frame *f, Lisp_Object spec)
             postprocess_image (f, img);
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* We're using IMG, so set its timestamp to `now'.  */
@@ -1878,16 +1847,11 @@ mark_image_cache (struct image_cache *c)
 
 #endif /* HAVE_NTGUI */
 
-static int x_create_x_image_and_pixmap (struct frame *, int, int, int,
-                                        XImagePtr *, Pixmap *);
-static void x_destroy_x_image (XImagePtr);
-static void x_put_x_image (struct frame *, XImagePtr, Pixmap, int, int);
-
-/* Return nonzero if XIMG's size WIDTH x HEIGHT doesn't break the
+/* Return true if XIMG's size WIDTH x HEIGHT doesn't break the
    windowing system.
    WIDTH and HEIGHT must both be positive.
    If XIMG is null, assume it is a bitmap.  */
-static int
+static bool
 x_check_image_size (XImagePtr ximg, int width, int height)
 {
 #ifdef HAVE_X_WINDOWS
@@ -1926,12 +1890,12 @@ x_check_image_size (XImagePtr ximg, int width, int height)
    frame F.  Set *XIMG and *PIXMAP to the XImage and Pixmap created.
    Set (*XIMG)->data to a raster of WIDTH x HEIGHT pixels allocated
    via xmalloc.  Print error messages via image_error if an error
-   occurs.  Value is non-zero if successful.
+   occurs.  Value is true if successful.
 
    On W32, a DEPTH of zero signifies a 24 bit image, otherwise DEPTH
    should indicate the bit depth of the image.  */
 
-static int
+static bool
 x_create_x_image_and_pixmap (struct frame *f, int width, int height, int depth,
                              XImagePtr *ximg, Pixmap *pixmap)
 {
@@ -1940,7 +1904,7 @@ x_create_x_image_and_pixmap (struct frame *f, int width, int height, int depth,
   Window window = FRAME_X_WINDOW (f);
   Screen *screen = FRAME_X_SCREEN (f);
 
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
 
   if (depth <= 0)
     depth = DefaultDepthOfScreen (screen);
@@ -2078,7 +2042,7 @@ x_create_x_image_and_pixmap (struct frame *f, int width, int height, int depth,
 static void
 x_destroy_x_image (XImagePtr ximg)
 {
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
   if (ximg)
     {
 #ifdef HAVE_X_WINDOWS
@@ -2107,7 +2071,7 @@ x_put_x_image (struct frame *f, XImagePtr ximg, Pixmap pixmap, int width, int he
 #ifdef HAVE_X_WINDOWS
   GC gc;
 
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
   gc = XCreateGC (FRAME_X_DISPLAY (f), pixmap, 0, NULL);
   XPutImage (FRAME_X_DISPLAY (f), pixmap, gc, ximg, 0, 0, 0, 0, width, height);
   XFreeGC (FRAME_X_DISPLAY (f), gc);
@@ -2203,15 +2167,9 @@ slurp_file (char *file, ptrdiff_t *size)
                               XBM images
  ***********************************************************************/
 
-static int xbm_scan (unsigned char **, unsigned char *, char *, int *);
-static int xbm_load (struct frame *f, struct image *img);
-static int xbm_load_image (struct frame *f, struct image *img,
-                           unsigned char *, unsigned char *);
-static int xbm_image_p (Lisp_Object object);
-static int xbm_read_bitmap_data (struct frame *f,
-                                 unsigned char *, unsigned char *,
-                                 int *, int *, char **, int);
-static int xbm_file_p (Lisp_Object);
+static bool xbm_load (struct frame *f, struct image *img);
+static bool xbm_image_p (Lisp_Object object);
+static bool xbm_file_p (Lisp_Object);
 
 
 /* Indices of image specification fields in xbm_format, below.  */
@@ -2275,10 +2233,10 @@ enum xbm_token
 };
 
 
-/* Return non-zero if OBJECT is a valid XBM-type image specification.
+/* Return true if OBJECT is a valid XBM-type image specification.
    A valid specification is a list starting with the symbol `image'
    The rest of the list is a property list which must contain an
-   entry `:type xbm..
+   entry `:type xbm'.
 
    If the specification specifies a file to load, it must contain
    an entry `:file FILENAME' where FILENAME is a string.
@@ -2304,7 +2262,7 @@ enum xbm_token
    foreground and background of the frame on which the image is
    displayed is used.  */
 
-static int
+static bool
 xbm_image_p (Lisp_Object object)
 {
   struct image_keyword kw[XBM_LAST];
@@ -2562,7 +2520,7 @@ convert_mono_to_color_image (struct frame *f, struct image *img,
 static void
 Create_Pixmap_From_Bitmap_Data (struct frame *f, struct image *img, char *data,
                                 RGB_PIXEL_COLOR fg, RGB_PIXEL_COLOR bg,
-                                int non_default_colors)
+                                bool non_default_colors)
 {
 #ifdef HAVE_NTGUI
   img->pixmap
@@ -2594,20 +2552,20 @@ Create_Pixmap_From_Bitmap_Data (struct frame *f, struct image *img, char *data,
    X versions.  CONTENTS is a pointer to a buffer to parse; END is the
    buffer's end.  Set *WIDTH and *HEIGHT to the width and height of
    the image.  Return in *DATA the bitmap data allocated with xmalloc.
-   Value is non-zero if successful.  DATA null means just test if
-   CONTENTS looks like an in-memory XBM file.  If INHIBIT_IMAGE_ERROR
-   is non-zero, inhibit the call to image_error when the image size is
-   invalid (the bitmap remains unread).  */
+   Value is true if successful.  DATA null means just test if
+   CONTENTS looks like an in-memory XBM file.  If INHIBIT_IMAGE_ERROR,
+   inhibit the call to image_error when the image size is invalid (the
+   bitmap remains unread).  */
 
-static int
+static bool
 xbm_read_bitmap_data (struct frame *f, unsigned char *contents, unsigned char *end,
                       int *width, int *height, char **data,
-                      int inhibit_image_error)
+                      bool inhibit_image_error)
 {
   unsigned char *s = contents;
   char buffer[BUFSIZ];
-  int padding_p = 0;
-  int v10 = 0;
+  bool padding_p = 0;
+  bool v10 = 0;
   int bytes_per_line, i, nbytes;
   char *p;
   int value;
@@ -2754,16 +2712,16 @@ xbm_read_bitmap_data (struct frame *f, unsigned char *contents, unsigned char *e
 
 
 /* Load XBM image IMG which will be displayed on frame F from buffer
-   CONTENTS.  END is the end of the buffer.  Value is non-zero if
+   CONTENTS.  END is the end of the buffer.  Value is true if
    successful.  */
 
-static int
+static bool
 xbm_load_image (struct frame *f, struct image *img, unsigned char *contents,
                 unsigned char *end)
 {
-  int rc;
+  bool rc;
   char *data;
-  int success_p = 0;
+  bool success_p = 0;
 
   rc = xbm_read_bitmap_data (f, contents, end, &img->width, &img->height,
                              &data, 0);
@@ -2771,7 +2729,7 @@ xbm_load_image (struct frame *f, struct image *img, unsigned char *contents,
     {
       unsigned long foreground = FRAME_FOREGROUND_PIXEL (f);
       unsigned long background = FRAME_BACKGROUND_PIXEL (f);
-      int non_default_colors = 0;
+      bool non_default_colors = 0;
       Lisp_Object value;
 
       eassert (img->width > 0 && img->height > 0);
@@ -2812,9 +2770,9 @@ xbm_load_image (struct frame *f, struct image *img, unsigned char *contents,
 }
 
 
-/* Value is non-zero if DATA looks like an in-memory XBM file.  */
+/* Value is true if DATA looks like an in-memory XBM file.  */
 
-static int
+static bool
 xbm_file_p (Lisp_Object data)
 {
   int w, h;
@@ -2826,12 +2784,12 @@ xbm_file_p (Lisp_Object data)
 
 
 /* Fill image IMG which is used on frame F with pixmap data.  Value is
-   non-zero if successful.  */
+   true if successful.  */
 
-static int
+static bool
 xbm_load (struct frame *f, struct image *img)
 {
-  int success_p = 0;
+  bool success_p = 0;
   Lisp_Object file_name;
 
   eassert (xbm_image_p (img->spec));
@@ -2867,10 +2825,10 @@ xbm_load (struct frame *f, struct image *img)
       Lisp_Object data;
       unsigned long foreground = FRAME_FOREGROUND_PIXEL (f);
       unsigned long background = FRAME_BACKGROUND_PIXEL (f);
-      int non_default_colors = 0;
+      bool non_default_colors = 0;
       char *bits;
-      int parsed_p;
-      int in_memory_file_p = 0;
+      bool parsed_p;
+      bool in_memory_file_p = 0;
 
       /* See if data looks like an in-memory XBM file.  */
       data = image_spec_value (img->spec, QCdata, NULL);
@@ -2879,7 +2837,6 @@ xbm_load (struct frame *f, struct image *img)
       /* Parse the image specification.  */
       memcpy (fmt, xbm_format, sizeof fmt);
       parsed_p = parse_image_spec (img->spec, fmt, XBM_LAST, Qxbm);
-      (void) parsed_p;
       eassert (parsed_p);
 
       /* Get specified width, and height.  */
@@ -2984,9 +2941,8 @@ xbm_load (struct frame *f, struct image *img)
 
 #if defined (HAVE_XPM) || defined (HAVE_NS)
 
-static int xpm_image_p (Lisp_Object object);
-static int xpm_load (struct frame *f, struct image *img);
-static int xpm_valid_color_symbols_p (Lisp_Object);
+static bool xpm_image_p (Lisp_Object object);
+static bool xpm_load (struct frame *f, struct image *img);
 
 #endif /* HAVE_XPM || HAVE_NS */
 
@@ -3053,7 +3009,7 @@ static const struct image_keyword xpm_format[XPM_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_xpm_functions (Lisp_Object);
+static bool init_xpm_functions (void);
 #else
 #define init_xpm_functions NULL
 #endif
@@ -3084,10 +3040,6 @@ static struct image_type xpm_type =
 
 #ifdef ALLOC_XPM_COLORS
 
-static void xpm_init_color_cache (struct frame *, XpmAttributes *);
-static void xpm_free_color_cache (void);
-static int xpm_lookup_color (struct frame *, char *, XColor *);
-static int xpm_color_bucket (char *);
 static struct xpm_cached_color *xpm_cache_color (struct frame *, char *,
                                                  XColor *, int);
 
@@ -3194,10 +3146,10 @@ xpm_cache_color (struct frame *f, char *color_name, XColor *color, int bucket)
 
 /* Look up color COLOR_NAME for frame F in the color cache.  If found,
    return the cached definition in *COLOR.  Otherwise, make a new
-   entry in the cache and allocate the color.  Value is zero if color
+   entry in the cache and allocate the color.  Value is false if color
    allocation failed.  */
 
-static int
+static bool
 xpm_lookup_color (struct frame *f, char *color_name, XColor *color)
 {
   struct xpm_cached_color *p;
@@ -3266,12 +3218,12 @@ DEF_IMGLIB_FN (int, XpmReadFileToImage, (Display *, char *, xpm_XImage **,
                                     xpm_XImage **, XpmAttributes *));
 DEF_IMGLIB_FN (void, XImageFree, (xpm_XImage *));
 
-static int
-init_xpm_functions (Lisp_Object libraries)
+static bool
+init_xpm_functions (void)
 {
   HMODULE library;
 
-  if (!(library = w32_delayed_load (libraries, Qxpm)))
+  if (!(library = w32_delayed_load (Qxpm)))
     return 0;
 
   LOAD_IMGLIB_FN (library, XpmFreeAttributes);
@@ -3284,11 +3236,11 @@ init_xpm_functions (Lisp_Object libraries)
 #endif /* HAVE_NTGUI */
 
 
-/* Value is non-zero if COLOR_SYMBOLS is a valid color symbols list
+/* Value is true if COLOR_SYMBOLS is a valid color symbols list
    for XPM images.  Such a list must consist of conses whose car and
    cdr are strings.  */
 
-static int
+static bool
 xpm_valid_color_symbols_p (Lisp_Object color_symbols)
 {
   while (CONSP (color_symbols))
@@ -3305,9 +3257,9 @@ xpm_valid_color_symbols_p (Lisp_Object color_symbols)
 }
 
 
-/* Value is non-zero if OBJECT is a valid XPM image specification.  */
+/* Value is true if OBJECT is a valid XPM image specification.  */
 
-static int
+static bool
 xpm_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[XPM_LAST];
@@ -3364,11 +3316,11 @@ x_create_bitmap_from_xpm_data (struct frame *f, const char **bits)
 #endif /* defined (HAVE_XPM) && defined (HAVE_X_WINDOWS) */
 
 /* Load image IMG which will be displayed on frame F.  Value is
-   non-zero if successful.  */
+   true if successful.  */
 
 #ifdef HAVE_XPM
 
-static int
+static bool
 xpm_load (struct frame *f, struct image *img)
 {
   int rc;
@@ -3822,7 +3774,7 @@ xpm_str_to_color_key (const char *s)
   return -1;
 }
 
-static int
+static bool
 xpm_load_image (struct frame *f,
                 struct image *img,
                 const unsigned char *contents,
@@ -3837,7 +3789,8 @@ xpm_load_image (struct frame *f,
   void (*put_color_table) (Lisp_Object, const unsigned char *, int, Lisp_Object);
   Lisp_Object (*get_color_table) (Lisp_Object, const unsigned char *, int);
   Lisp_Object frame, color_symbols, color_table;
-  int best_key, have_mask = 0;
+  int best_key;
+  bool have_mask = 0;
   XImagePtr ximg = NULL, mask_img = NULL;
 
 #define match() \
@@ -4057,11 +4010,11 @@ xpm_load_image (struct frame *f,
 #undef expect_ident
 }
 
-static int
+static bool
 xpm_load (struct frame *f,
           struct image *img)
 {
-  int success_p = 0;
+  bool success_p = 0;
   Lisp_Object file_name;
 
   /* If IMG->spec specifies a file name, create a non-file spec from it.  */
@@ -4232,7 +4185,7 @@ lookup_rgb_color (struct frame *f, int r, int g, int b)
 #ifdef HAVE_X_WINDOWS
       XColor color;
       Colormap cmap;
-      int rc;
+      bool rc;
 #else
       COLORREF color;
 #endif
@@ -4300,7 +4253,7 @@ lookup_pixel_color (struct frame *f, unsigned long pixel)
     {
       XColor color;
       Colormap cmap;
-      int rc;
+      bool rc;
 
       if (ct_colors_allocated_max <= ct_colors_allocated)
         return FRAME_FOREGROUND_PIXEL (f);
@@ -4311,12 +4264,12 @@ lookup_pixel_color (struct frame *f, unsigned long pixel)
       x_query_color (f, &color);
       rc = x_alloc_nearest_color (f, cmap, &color);
 #else
-      BLOCK_INPUT;
+      block_input ();
       cmap = DefaultColormapOfScreen (FRAME_X_SCREEN (f));
       color.pixel = pixel;
       XQueryColor (NULL, cmap, &color);
       rc = x_alloc_nearest_color (f, cmap, &color);
-      UNBLOCK_INPUT;
+      unblock_input ();
 #endif /* HAVE_X_WINDOWS */
 
       if (rc)
@@ -4394,14 +4347,6 @@ init_color_table (void)
                               Algorithms
  ***********************************************************************/
 
-static XColor *x_to_xcolors (struct frame *, struct image *, int);
-static void x_from_xcolors (struct frame *, struct image *, XColor *);
-static void x_detect_edges (struct frame *, struct image *, int[9], int);
-
-#ifdef HAVE_NTGUI
-static void XPutPixel (XImagePtr , int, int, COLORREF);
-#endif /* HAVE_NTGUI */
-
 /* Edge detection matrices for different edge-detection
    strategies.  */
 
@@ -4427,12 +4372,12 @@ static int laplace_matrix[9] = {
 
 /* On frame F, return an array of XColor structures describing image
    IMG->pixmap.  Each XColor structure has its pixel color set.  RGB_P
-   non-zero means also fill the red/green/blue members of the XColor
+   means also fill the red/green/blue members of the XColor
    structures.  Value is a pointer to the array of XColors structures,
    allocated with xmalloc; it must be freed by the caller.  */
 
 static XColor *
-x_to_xcolors (struct frame *f, struct image *img, int rgb_p)
+x_to_xcolors (struct frame *f, struct image *img, bool rgb_p)
 {
   int x, y;
   XColor *colors, *p;
@@ -4808,9 +4753,9 @@ x_disable_image (struct frame *f, struct image *img)
    determine the background color of IMG.  If it is a list '(R G B)',
    with R, G, and B being integers >= 0, take that as the color of the
    background.  Otherwise, determine the background color of IMG
-   heuristically.  Value is non-zero if successful. */
+   heuristically.  */
 
-static int
+static void
 x_build_heuristic_mask (struct frame *f, struct image *img, Lisp_Object how)
 {
   XImagePtr_or_DC ximg;
@@ -4822,7 +4767,8 @@ x_build_heuristic_mask (struct frame *f, struct image *img, Lisp_Object how)
   char *mask_img;
   int row_width;
 #endif /* HAVE_NTGUI */
-  int x, y, rc, use_img_background;
+  int x, y;
+  bool rc, use_img_background;
   unsigned long bg = 0;
 
   if (img->mask)
@@ -4838,7 +4784,7 @@ x_build_heuristic_mask (struct frame *f, struct image *img, Lisp_Object how)
   rc = x_create_x_image_and_pixmap (f, img->width, img->height, 1,
                                     &mask_img, &img->mask);
   if (!rc)
-    return 0;
+    return;
 #endif /* !HAVE_NS */
 
   /* Get the X image of IMG->pixmap.  */
@@ -4928,8 +4874,6 @@ x_build_heuristic_mask (struct frame *f, struct image *img, Lisp_Object how)
 #endif /* HAVE_NTGUI */
 
   Destroy_Image (ximg, prev);
-
-  return 1;
 }
 
 
@@ -4937,9 +4881,8 @@ x_build_heuristic_mask (struct frame *f, struct image *img, Lisp_Object how)
                        PBM (mono, gray, color)
  ***********************************************************************/
 
-static int pbm_image_p (Lisp_Object object);
-static int pbm_load (struct frame *f, struct image *img);
-static int pbm_scan_number (unsigned char **, unsigned char *);
+static bool pbm_image_p (Lisp_Object object);
+static bool pbm_load (struct frame *f, struct image *img);
 
 /* The symbol `pbm' identifying images of this type.  */
 
@@ -4994,9 +4937,9 @@ static struct image_type pbm_type =
 };
 
 
-/* Return non-zero if OBJECT is a valid PBM image specification.  */
+/* Return true if OBJECT is a valid PBM image specification.  */
 
-static int
+static bool
 pbm_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[PBM_LAST];
@@ -5089,10 +5032,11 @@ pbm_read_file (Lisp_Object file, int *size)
 
 /* Load PBM image IMG for use on frame F.  */
 
-static int
+static bool
 pbm_load (struct frame *f, struct image *img)
 {
-  int raw_p, x, y;
+  bool raw_p;
+  int x, y;
   int width, height, max_color_idx = 0;
   XImagePtr ximg;
   Lisp_Object file, specified_file;
@@ -5355,8 +5299,8 @@ pbm_load (struct frame *f, struct image *img)
 
 /* Function prototypes.  */
 
-static int png_image_p (Lisp_Object object);
-static int png_load (struct frame *f, struct image *img);
+static bool png_image_p (Lisp_Object object);
+static bool png_load (struct frame *f, struct image *img);
 
 /* The symbol `png' identifying images of this type.  */
 
@@ -5397,7 +5341,7 @@ static const struct image_keyword png_format[PNG_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_png_functions (Lisp_Object);
+static bool init_png_functions (void);
 #else
 #define init_png_functions NULL
 #endif
@@ -5414,9 +5358,9 @@ static struct image_type png_type =
   NULL
 };
 
-/* Return non-zero if OBJECT is a valid PNG image specification.  */
+/* Return true if OBJECT is a valid PNG image specification.  */
 
-static int
+static bool
 png_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[PNG_LAST];
@@ -5468,12 +5412,12 @@ DEF_IMGLIB_FN (void, png_longjmp, (png_structp, int));
 DEF_IMGLIB_FN (jmp_buf *, png_set_longjmp_fn, (png_structp, png_longjmp_ptr, size_t));
 #endif /* libpng version >= 1.5 */
 
-static int
-init_png_functions (Lisp_Object libraries)
+static bool
+init_png_functions (void)
 {
   HMODULE library;
 
-  if (!(library = w32_delayed_load (libraries, Qpng)))
+  if (!(library = w32_delayed_load (Qpng)))
     return 0;
 
   LOAD_IMGLIB_FN (library, png_get_io_ptr);
@@ -5619,7 +5563,7 @@ png_read_from_file (png_structp png_ptr, png_bytep data, png_size_t length)
 }
 
 
-/* Load PNG image IMG for use on frame F.  Value is non-zero if
+/* Load PNG image IMG for use on frame F.  Value is true if
    successful.  */
 
 struct png_load_context
@@ -5633,7 +5577,7 @@ struct png_load_context
   png_byte **rows;
 };
 
-static int
+static bool
 png_load_body (struct frame *f, struct image *img, struct png_load_context *c)
 {
   Lisp_Object file, specified_file;
@@ -5651,7 +5595,7 @@ png_load_body (struct frame *f, struct image *img, struct png_load_context *c)
   int bit_depth, color_type, interlace_type;
   png_byte channels;
   png_uint_32 row_bytes;
-  int transparent_p;
+  bool transparent_p;
   struct png_memory_storage tbr;  /* Data to be read */
 
   /* Find out what file to load.  */
@@ -5984,7 +5928,7 @@ png_load_body (struct frame *f, struct image *img, struct png_load_context *c)
   return 1;
 }
 
-static int
+static bool
 png_load (struct frame *f, struct image *img)
 {
   struct png_load_context c;
@@ -5994,7 +5938,7 @@ png_load (struct frame *f, struct image *img)
 #else /* HAVE_PNG */
 
 #ifdef HAVE_NS
-static int
+static bool
 png_load (struct frame *f, struct image *img)
 {
   return ns_load_image (f, img,
@@ -6014,8 +5958,8 @@ png_load (struct frame *f, struct image *img)
 
 #if defined (HAVE_JPEG) || defined (HAVE_NS)
 
-static int jpeg_image_p (Lisp_Object object);
-static int jpeg_load (struct frame *f, struct image *img);
+static bool jpeg_image_p (Lisp_Object object);
+static bool jpeg_load (struct frame *f, struct image *img);
 
 /* The symbol `jpeg' identifying images of this type.  */
 
@@ -6056,7 +6000,7 @@ static const struct image_keyword jpeg_format[JPEG_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_jpeg_functions (Lisp_Object);
+static bool init_jpeg_functions (void);
 #else
 #define init_jpeg_functions NULL
 #endif
@@ -6073,9 +6017,9 @@ static struct image_type jpeg_type =
   NULL
 };
 
-/* Return non-zero if OBJECT is a valid JPEG image specification.  */
+/* Return true if OBJECT is a valid JPEG image specification.  */
 
-static int
+static bool
 jpeg_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[JPEG_LAST];
@@ -6124,12 +6068,12 @@ DEF_IMGLIB_FN (JDIMENSION, jpeg_read_scanlines, (j_decompress_ptr, JSAMPARRAY, J
 DEF_IMGLIB_FN (struct jpeg_error_mgr *, jpeg_std_error, (struct jpeg_error_mgr *));
 DEF_IMGLIB_FN (boolean, jpeg_resync_to_restart, (j_decompress_ptr, int));
 
-static int
-init_jpeg_functions (Lisp_Object libraries)
+static bool
+init_jpeg_functions (void)
 {
   HMODULE library;
 
-  if (!(library = w32_delayed_load (libraries, Qjpeg)))
+  if (!(library = w32_delayed_load (Qjpeg)))
     return 0;
 
   LOAD_IMGLIB_FN (library, jpeg_finish_decompress);
@@ -6394,7 +6338,7 @@ jpeg_file_src (j_decompress_ptr cinfo, FILE *fp)
 /* Load image IMG for use on frame F.  Patterned after example.c
    from the JPEG lib.  */
 
-static int
+static bool
 jpeg_load_body (struct frame *f, struct image *img,
                 struct my_jpeg_error_mgr *mgr)
 {
@@ -6575,7 +6519,7 @@ jpeg_load_body (struct frame *f, struct image *img,
   return 1;
 }
 
-static int
+static bool
 jpeg_load (struct frame *f, struct image *img)
 {
   struct my_jpeg_error_mgr mgr;
@@ -6585,7 +6529,7 @@ jpeg_load (struct frame *f, struct image *img)
 #else /* HAVE_JPEG */
 
 #ifdef HAVE_NS
-static int
+static bool
 jpeg_load (struct frame *f, struct image *img)
 {
   return ns_load_image (f, img,
@@ -6604,8 +6548,8 @@ jpeg_load (struct frame *f, struct image *img)
 
 #if defined (HAVE_TIFF) || defined (HAVE_NS)
 
-static int tiff_image_p (Lisp_Object object);
-static int tiff_load (struct frame *f, struct image *img);
+static bool tiff_image_p (Lisp_Object object);
+static bool tiff_load (struct frame *f, struct image *img);
 
 /* The symbol `tiff' identifying images of this type.  */
 
@@ -6648,7 +6592,7 @@ static const struct image_keyword tiff_format[TIFF_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_tiff_functions (Lisp_Object);
+static bool init_tiff_functions (void);
 #else
 #define init_tiff_functions NULL
 #endif
@@ -6665,9 +6609,9 @@ static struct image_type tiff_type =
   NULL
 };
 
-/* Return non-zero if OBJECT is a valid TIFF image specification.  */
+/* Return true if OBJECT is a valid TIFF image specification.  */
 
-static int
+static bool
 tiff_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[TIFF_LAST];
@@ -6701,12 +6645,12 @@ DEF_IMGLIB_FN (int, TIFFReadRGBAImage, (TIFF *, uint32, uint32, uint32 *, int));
 DEF_IMGLIB_FN (void, TIFFClose, (TIFF *));
 DEF_IMGLIB_FN (int, TIFFSetDirectory, (TIFF *, tdir_t));
 
-static int
-init_tiff_functions (Lisp_Object libraries)
+static bool
+init_tiff_functions (void)
 {
   HMODULE library;
 
-  if (!(library = w32_delayed_load (libraries, Qtiff)))
+  if (!(library = w32_delayed_load (Qtiff)))
     return 0;
 
   LOAD_IMGLIB_FN (library, TIFFSetErrorHandler);
@@ -6871,10 +6815,10 @@ tiff_warning_handler (const char *title, const char *format, va_list ap)
 }
 
 
-/* Load TIFF image IMG for use on frame F.  Value is non-zero if
+/* Load TIFF image IMG for use on frame F.  Value is true if
    successful.  */
 
-static int
+static bool
 tiff_load (struct frame *f, struct image *img)
 {
   Lisp_Object file, specified_file;
@@ -7039,7 +6983,7 @@ tiff_load (struct frame *f, struct image *img)
 #else /* HAVE_TIFF */
 
 #ifdef HAVE_NS
-static int
+static bool
 tiff_load (struct frame *f, struct image *img)
 {
   return ns_load_image (f, img,
@@ -7058,8 +7002,8 @@ tiff_load (struct frame *f, struct image *img)
 
 #if defined (HAVE_GIF) || defined (HAVE_NS)
 
-static int gif_image_p (Lisp_Object object);
-static int gif_load (struct frame *f, struct image *img);
+static bool gif_image_p (Lisp_Object object);
+static bool gif_load (struct frame *f, struct image *img);
 static void gif_clear_image (struct frame *f, struct image *img);
 
 /* The symbol `gif' identifying images of this type.  */
@@ -7103,7 +7047,7 @@ static const struct image_keyword gif_format[GIF_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_gif_functions (Lisp_Object);
+static bool init_gif_functions (void);
 #else
 #define init_gif_functions NULL
 #endif
@@ -7129,9 +7073,9 @@ gif_clear_image (struct frame *f, struct image *img)
   x_clear_image (f, img);
 }
 
-/* Return non-zero if OBJECT is a valid GIF image specification.  */
+/* Return true if OBJECT is a valid GIF image specification.  */
 
-static int
+static bool
 gif_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[GIF_LAST];
@@ -7174,12 +7118,12 @@ DEF_IMGLIB_FN (int, DGifSlurp, (GifFileType *));
 DEF_IMGLIB_FN (GifFileType *, DGifOpen, (void *, InputFunc));
 DEF_IMGLIB_FN (GifFileType *, DGifOpenFileName, (const char *));
 
-static int
-init_gif_functions (Lisp_Object libraries)
+static bool
+init_gif_functions (void)
 {
   HMODULE library;
 
-  if (!(library = w32_delayed_load (libraries, Qgif)))
+  if (!(library = w32_delayed_load (Qgif)))
     return 0;
 
   LOAD_IMGLIB_FN (library, DGifCloseFile);
@@ -7228,7 +7172,7 @@ gif_read_from_memory (GifFileType *file, GifByteType *buf, int len)
 }
 
 
-/* Load GIF image IMG for use on frame F.  Value is non-zero if
+/* Load GIF image IMG for use on frame F.  Value is true if
    successful.  */
 
 static const int interlace_start[] = {0, 4, 2, 1};
@@ -7236,7 +7180,7 @@ static const int interlace_increment[] = {8, 8, 4, 2};
 
 #define GIF_LOCAL_DESCRIPTOR_EXTENSION 249
 
-static int
+static bool
 gif_load (struct frame *f, struct image *img)
 {
   Lisp_Object file;
@@ -7534,7 +7478,7 @@ gif_load (struct frame *f, struct image *img)
 #else  /* !HAVE_GIF */
 
 #ifdef HAVE_NS
-static int
+static bool
 gif_load (struct frame *f, struct image *img)
 {
   return ns_load_image (f, img,
@@ -7553,8 +7497,8 @@ gif_load (struct frame *f, struct image *img)
 
 static Lisp_Object Qimagemagick;
 
-static int imagemagick_image_p (Lisp_Object);
-static int imagemagick_load (struct frame *, struct image *);
+static bool imagemagick_image_p (Lisp_Object);
+static bool imagemagick_load (struct frame *, struct image *);
 static void imagemagick_clear_image (struct frame *, struct image *);
 
 /* Indices of image specification fields in imagemagick_format.  */
@@ -7600,7 +7544,7 @@ static struct image_keyword imagemagick_format[IMAGEMAGICK_LAST] =
   };
 
 #ifdef HAVE_NTGUI
-static int init_imagemagick_functions (Lisp_Object);
+static bool init_imagemagick_functions (void);
 #else
 #define init_imagemagick_functions NULL
 #endif
@@ -7627,11 +7571,11 @@ imagemagick_clear_image (struct frame *f,
   x_clear_image (f, img);
 }
 
-/* Return non-zero if OBJECT is a valid IMAGEMAGICK image specification.  Do
+/* Return true if OBJECT is a valid IMAGEMAGICK image specification.  Do
    this by calling parse_image_spec and supplying the keywords that
    identify the IMAGEMAGICK format.   */
 
-static int
+static bool
 imagemagick_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[IMAGEMAGICK_LAST];
@@ -7683,9 +7627,9 @@ imagemagick_error (MagickWand *wand)
    be parsed; SIZE is the number of bytes of data; and FILENAME is
    either the file name or the image data.
 
-   Return non-zero if successful.  */
+   Return true if successful.  */
 
-static int
+static bool
 imagemagick_load_image (struct frame *f, struct image *img,
                         unsigned char *contents, unsigned int size,
                         char *filename)
@@ -8023,14 +7967,14 @@ imagemagick_load_image (struct frame *f, struct image *img,
 }
 
 
-/* Load IMAGEMAGICK image IMG for use on frame F.  Value is non-zero if
+/* Load IMAGEMAGICK image IMG for use on frame F.  Value is true if
    successful. this function will go into the imagemagick_type structure, and
    the prototype thus needs to be compatible with that structure.  */
 
-static int
+static bool
 imagemagick_load (struct frame *f, struct image *img)
 {
-  int success_p = 0;
+  bool success_p = 0;
   Lisp_Object file_name;
 
   /* If IMG->spec specifies a file name, create a non-file spec from it.  */
@@ -8109,11 +8053,11 @@ and `imagemagick-types-inhibit'.  */)
 
 /* Function prototypes.  */
 
-static int svg_image_p (Lisp_Object object);
-static int svg_load (struct frame *f, struct image *img);
+static bool svg_image_p (Lisp_Object object);
+static bool svg_load (struct frame *f, struct image *img);
 
-static int svg_load_image (struct frame *, struct image *,
-                           unsigned char *, ptrdiff_t);
+static bool svg_load_image (struct frame *, struct image *,
+                            unsigned char *, ptrdiff_t);
 
 /* The symbol `svg' identifying images of this type. */
 
@@ -8154,7 +8098,7 @@ static const struct image_keyword svg_format[SVG_LAST] =
 };
 
 #ifdef HAVE_NTGUI
-static int init_svg_functions (Lisp_Object);
+static bool init_svg_functions (void);
 #else
 #define init_svg_functions NULL
 #endif
@@ -8174,11 +8118,11 @@ static struct image_type svg_type =
 };
 
 
-/* Return non-zero if OBJECT is a valid SVG image specification.  Do
+/* Return true if OBJECT is a valid SVG image specification.  Do
    this by calling parse_image_spec and supplying the keywords that
    identify the SVG format.   */
 
-static int
+static bool
 svg_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[SVG_LAST];
@@ -8217,15 +8161,15 @@ DEF_IMGLIB_FN (void, g_error_free);
 
 Lisp_Object Qgdk_pixbuf, Qglib, Qgobject;
 
-static int
-init_svg_functions (Lisp_Object libraries)
+static bool
+init_svg_functions (void)
 {
   HMODULE library, gdklib, glib, gobject;
 
-  if (!(glib = w32_delayed_load (libraries, Qglib))
-      || !(gobject = w32_delayed_load (libraries, Qgobject))
-      || !(gdklib = w32_delayed_load (libraries, Qgdk_pixbuf))
-      || !(library = w32_delayed_load (libraries, Qsvg)))
+  if (!(glib = w32_delayed_load (Qglib))
+      || !(gobject = w32_delayed_load (Qgobject))
+      || !(gdklib = w32_delayed_load (Qgdk_pixbuf))
+      || !(library = w32_delayed_load (Qsvg)))
     return 0;
 
   LOAD_IMGLIB_FN (library, rsvg_handle_new);
@@ -8273,14 +8217,13 @@ init_svg_functions (Lisp_Object libraries)
 #define fn_g_error_free                   g_error_free
 #endif /* !HAVE_NTGUI  */
 
-/* Load SVG image IMG for use on frame F.  Value is non-zero if
-   successful. this function will go into the svg_type structure, and
-   the prototype thus needs to be compatible with that structure.  */
+/* Load SVG image IMG for use on frame F.  Value is true if
+   successful.  */
 
-static int
+static bool
 svg_load (struct frame *f, struct image *img)
 {
-  int success_p = 0;
+  bool success_p = 0;
   Lisp_Object file_name;
 
   /* If IMG->spec specifies a file name, create a non-file spec from it.  */
@@ -8333,8 +8276,8 @@ svg_load (struct frame *f, struct image *img)
 
    Uses librsvg to do most of the image processing.
 
-   Returns non-zero when successful.  */
-static int
+   Returns true when successful.  */
+static bool
 svg_load_image (struct frame *f,         /* Pointer to emacs frame structure.  */
                 struct image *img,       /* Pointer to emacs image structure.  */
                 unsigned char *contents, /* String containing the SVG XML data to be parsed.  */
@@ -8501,8 +8444,8 @@ svg_load_image (struct frame *f,         /* Pointer to emacs frame structure.  *
 
 #ifdef HAVE_GHOSTSCRIPT
 
-static int gs_image_p (Lisp_Object object);
-static int gs_load (struct frame *f, struct image *img);
+static bool gs_image_p (Lisp_Object object);
+static bool gs_load (struct frame *f, struct image *img);
 static void gs_clear_image (struct frame *f, struct image *img);
 
 /* Keyword symbols.  */
@@ -8549,12 +8492,6 @@ static const struct image_keyword gs_format[GS_LAST] =
   {":background",       IMAGE_STRING_OR_NIL_VALUE,              0}
 };
 
-#ifdef HAVE_NTGUI
-static int init_gs_functions (Lisp_Object);
-#else
-#define init_gs_functions NULL
-#endif
-
 /* Structure describing the image type `ghostscript'.  */
 
 static struct image_type gs_type =
@@ -8563,7 +8500,7 @@ static struct image_type gs_type =
   gs_image_p,
   gs_load,
   gs_clear_image,
-  init_gs_functions,
+  NULL,
   NULL
 };
 
@@ -8577,10 +8514,10 @@ gs_clear_image (struct frame *f, struct image *img)
 }
 
 
-/* Return non-zero if OBJECT is a valid Ghostscript image
+/* Return true if OBJECT is a valid Ghostscript image
    specification.  */
 
-static int
+static bool
 gs_image_p (Lisp_Object object)
 {
   struct image_keyword fmt[GS_LAST];
@@ -8617,10 +8554,10 @@ gs_image_p (Lisp_Object object)
 }
 
 
-/* Load Ghostscript image IMG for use on frame F.  Value is non-zero
+/* Load Ghostscript image IMG for use on frame F.  Value is true
    if successful.  */
 
-static int
+static bool
 gs_load (struct frame *f, struct image *img)
 {
   uprintmax_t printnum1, printnum2;
@@ -8656,11 +8593,11 @@ gs_load (struct frame *f, struct image *img)
   if (x_check_image_size (0, img->width, img->height))
     {
       /* Only W32 version did BLOCK_INPUT here.  ++kfs */
-      BLOCK_INPUT;
+      block_input ();
       img->pixmap = XCreatePixmap (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                                    img->width, img->height,
                                    DefaultDepthOfScreen (FRAME_X_SCREEN (f)));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   if (!img->pixmap)
@@ -8736,7 +8673,7 @@ x_kill_gs_process (Pixmap pixmap, struct frame *f)
     {
       XImagePtr ximg;
 
-      BLOCK_INPUT;
+      block_input ();
 
       /* Try to get an XImage for img->pixmep.  */
       ximg = XGetImage (FRAME_X_DISPLAY (f), img->pixmap,
@@ -8779,15 +8716,15 @@ x_kill_gs_process (Pixmap pixmap, struct frame *f)
         image_error ("Cannot get X image of `%s'; colors will not be freed",
                      img->spec, Qnil);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif /* HAVE_X_WINDOWS */
 
   /* Now that we have the pixmap, compute mask and transform the
      image if requested.  */
-  BLOCK_INPUT;
+  block_input ();
   postprocess_image (f, img);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 #endif /* HAVE_GHOSTSCRIPT */
@@ -8826,88 +8763,92 @@ DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
                             Initialization
  ***********************************************************************/
 
-DEFUN ("init-image-library", Finit_image_library, Sinit_image_library, 2, 2, 0,
+DEFUN ("init-image-library", Finit_image_library, Sinit_image_library, 1, 1, 0,
        doc: /* Initialize image library implementing image type TYPE.
 Return non-nil if TYPE is a supported image type.
 
-Image types pbm and xbm are prebuilt; other types are loaded here.
-Libraries to load are specified in alist LIBRARIES (usually, the value
-of `dynamic-library-alist', which see).  */)
-  (Lisp_Object type, Lisp_Object libraries)
+If image libraries are loaded dynamically (currently only the case on
+MS-Windows), load the library for TYPE if it is not yet loaded, using
+the library file(s) specified by `dynamic-library-alist'.  */)
+  (Lisp_Object type)
 {
-  return lookup_image_type (type, libraries) ? Qt : Qnil;
+  return lookup_image_type (type) ? Qt : Qnil;
 }
 
 /* Look up image type TYPE, and return a pointer to its image_type
-   structure.  Return 0 if TYPE is not a known image type.
-
-   LIBRARIES is an alist associating dynamic libraries to external
-   files implementing them, which is passed to the image library
-   initialization function if necessary.  A nil value defaults to
-   Vdynamic_library_alist.  */
+   structure.  Return 0 if TYPE is not a known image type.  */
 
 static struct image_type *
-lookup_image_type (Lisp_Object type, Lisp_Object libraries)
+lookup_image_type (Lisp_Object type)
 {
-  if (NILP (libraries))
-    libraries = Vdynamic_library_alist;
-
   /* Types pbm and xbm are built-in and always available.  */
   if (EQ (type, Qpbm))
-    return define_image_type (&pbm_type, libraries);
+    return define_image_type (&pbm_type);
 
   if (EQ (type, Qxbm))
-    return define_image_type (&xbm_type, libraries);
+    return define_image_type (&xbm_type);
 
 #if defined (HAVE_XPM) || defined (HAVE_NS)
   if (EQ (type, Qxpm))
-    return define_image_type (&xpm_type, libraries);
+    return define_image_type (&xpm_type);
 #endif
 
 #if defined (HAVE_JPEG) || defined (HAVE_NS)
   if (EQ (type, Qjpeg))
-    return define_image_type (&jpeg_type, libraries);
+    return define_image_type (&jpeg_type);
 #endif
 
 #if defined (HAVE_TIFF) || defined (HAVE_NS)
   if (EQ (type, Qtiff))
-    return define_image_type (&tiff_type, libraries);
+    return define_image_type (&tiff_type);
 #endif
 
 #if defined (HAVE_GIF) || defined (HAVE_NS)
   if (EQ (type, Qgif))
-    return define_image_type (&gif_type, libraries);
+    return define_image_type (&gif_type);
 #endif
 
 #if defined (HAVE_PNG) || defined (HAVE_NS)
   if (EQ (type, Qpng))
-    return define_image_type (&png_type, libraries);
+    return define_image_type (&png_type);
 #endif
 
 #if defined (HAVE_RSVG)
   if (EQ (type, Qsvg))
-    return define_image_type (&svg_type, libraries);
+    return define_image_type (&svg_type);
 #endif
 
 #if defined (HAVE_IMAGEMAGICK)
   if (EQ (type, Qimagemagick))
-    return define_image_type (&imagemagick_type, libraries);
+    return define_image_type (&imagemagick_type);
 #endif
 
 #ifdef HAVE_GHOSTSCRIPT
   if (EQ (type, Qpostscript))
-    return define_image_type (&gs_type, libraries);
+    return define_image_type (&gs_type);
 #endif
 
   return NULL;
 }
 
+/* Reset image_types before dumping.
+   Called from Fdump_emacs.  */
+
+void
+reset_image_types (void)
+{
+  while (image_types)
+    {
+      struct image_type *next = image_types->next;
+      xfree (image_types);
+      image_types = next;
+    }
+}
+
 void
 syms_of_image (void)
 {
-  /* Initialize this only once, since that's what we do with Vimage_types
-     and they are supposed to be in sync.  Initializing here gives correct
-     operation on GNU/Linux of calling dump-emacs after loading some images.  */
+  /* Initialize this only once; it will be reset before dumping.  */
   image_types = NULL;
 
   /* Must be defined now because we're going to update it below, while
diff --git a/src/indent.c b/src/indent.c
index 053643e6319..b368a7aeb09 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -115,7 +115,7 @@ character_width (int c, struct Lisp_Char_Table *dp)
    for characters as WIDTHTAB.  We use this to decide when to
    invalidate the buffer's width_run_cache.  */
 
-int
+bool
 disptab_matches_widthtab (struct Lisp_Char_Table *disptab, struct Lisp_Vector *widthtab)
 {
   int i;
@@ -320,14 +320,14 @@ invalidate_current_column (void)
 ptrdiff_t
 current_column (void)
 {
-  register ptrdiff_t col;
-  register unsigned char *ptr, *stop;
-  register int tab_seen;
+  ptrdiff_t col;
+  unsigned char *ptr, *stop;
+  bool tab_seen;
   ptrdiff_t post_tab;
-  register int c;
+  int c;
   int tab_width = SANE_TAB_WIDTH (current_buffer);
-  int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
-  register struct Lisp_Char_Table *dp = buffer_display_table ();
+  bool ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
+  struct Lisp_Char_Table *dp = buffer_display_table ();
 
   if (PT == last_known_column_point
       && MODIFF == last_known_column_modified)
@@ -512,9 +512,9 @@ static void
 scan_for_column (ptrdiff_t *endpos, EMACS_INT *goalcol, ptrdiff_t *prevcol)
 {
   int tab_width = SANE_TAB_WIDTH (current_buffer);
-  register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
-  register struct Lisp_Char_Table *dp = buffer_display_table ();
-  int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters));
+  bool ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
+  struct Lisp_Char_Table *dp = buffer_display_table ();
+  bool multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters));
   struct composition_it cmp_it;
   Lisp_Object window;
   struct window *w;
@@ -722,14 +722,14 @@ current_column_1 (void)
 static double
 string_display_width (Lisp_Object string, Lisp_Object beg, Lisp_Object end)
 {
-  register int col;
-  register unsigned char *ptr, *stop;
-  register int tab_seen;
+  int col;
+  unsigned char *ptr, *stop;
+  bool tab_seen;
   int post_tab;
-  register int c;
+  int c;
   int tab_width = SANE_TAB_WIDTH (current_buffer);
-  int ctl_arrow = !NILP (current_buffer->ctl_arrow);
-  register struct Lisp_Char_Table *dp = buffer_display_table ();
+  bool ctl_arrow = !NILP (current_buffer->ctl_arrow);
+  struct Lisp_Char_Table *dp = buffer_display_table ();
   int b, e;
 
   if (NILP (end))
@@ -945,7 +945,7 @@ position_indentation (ptrdiff_t pos_byte)
    Blank lines are treated as if they had the same indentation as the
    preceding line.  */
 
-int
+bool
 indented_beyond_p (ptrdiff_t pos, ptrdiff_t pos_byte, EMACS_INT column)
 {
   ptrdiff_t val;
@@ -1047,11 +1047,11 @@ static struct position val_compute_motion;
    can't hit the requested column exactly (because of a tab or other
    multi-column character), overshoot.
 
-   DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings
+   DID_MOTION is true if FROMHPOS has already accounted for overlay strings
    at FROM.  This is the case if FROMVPOS and FROMVPOS came from an
    earlier call to compute_motion.  The other common case is that FROMHPOS
    is zero and FROM is a position that "belongs" at column zero, but might
-   be shifted by overlay strings; in this case DID_MOTION should be 0.
+   be shifted by overlay strings; in this case DID_MOTION should be false.
 
    WIDTH is the number of columns available to display text;
    compute_motion uses this to handle continuation lines and such.
@@ -1104,17 +1104,20 @@ static struct position val_compute_motion;
    the scroll bars if they are turned on.  */
 
 struct position *
-compute_motion (ptrdiff_t from, EMACS_INT fromvpos, EMACS_INT fromhpos, int did_motion, ptrdiff_t to, EMACS_INT tovpos, EMACS_INT tohpos, EMACS_INT width, ptrdiff_t hscroll, int tab_offset, struct window *win)
+compute_motion (ptrdiff_t from, EMACS_INT fromvpos, EMACS_INT fromhpos,
+                bool did_motion, ptrdiff_t to,
+                EMACS_INT tovpos, EMACS_INT tohpos, EMACS_INT width,
+                ptrdiff_t hscroll, int tab_offset, struct window *win)
 {
-  register EMACS_INT hpos = fromhpos;
-  register EMACS_INT vpos = fromvpos;
+  EMACS_INT hpos = fromhpos;
+  EMACS_INT vpos = fromvpos;
 
-  register ptrdiff_t pos;
+  ptrdiff_t pos;
   ptrdiff_t pos_byte;
-  register int c = 0;
+  int c = 0;
   int tab_width = SANE_TAB_WIDTH (current_buffer);
-  register int ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
-  register struct Lisp_Char_Table *dp = window_display_table (win);
+  bool ctl_arrow = !NILP (BVAR (current_buffer, ctl_arrow));
+  struct Lisp_Char_Table *dp = window_display_table (win);
   EMACS_INT selective
     = (INTEGERP (BVAR (current_buffer, selective_display))
        ? XINT (BVAR (current_buffer, selective_display))
@@ -1139,7 +1142,7 @@ compute_motion (ptrdiff_t from, EMACS_INT fromvpos, EMACS_INT fromhpos, int did_
   ptrdiff_t next_width_run = from;
   Lisp_Object window;
 
-  int multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters));
+  bool multibyte = !NILP (BVAR (current_buffer, enable_multibyte_characters));
   /* If previous char scanned was a wide character,
      this is the column where it ended.  Otherwise, this is 0.  */
   EMACS_INT wide_column_end_hpos = 0;
@@ -1308,7 +1311,7 @@ compute_motion (ptrdiff_t from, EMACS_INT fromvpos, EMACS_INT fromhpos, int did_
       if (hpos > width)
         {
           EMACS_INT total_width = width + continuation_glyph_width;
-          int truncate = 0;
+          bool truncate = 0;
 
           if (!NILP (Vtruncate_partial_width_windows)
               && (total_width < FRAME_COLS (XFRAME (WINDOW_FRAME (win)))))
@@ -1827,7 +1830,7 @@ vmotion (register ptrdiff_t from, register EMACS_INT vtarget, struct window *w)
                          PTRDIFF_MAX)
        : !NILP (BVAR (current_buffer, selective_display)) ? -1 : 0);
   Lisp_Object window;
-  int did_motion;
+  bool did_motion;
   /* This is the object we use for fetching character properties.  */
   Lisp_Object text_prop_object;
 
@@ -2017,8 +2020,8 @@ whether or not it is currently displayed in some window.  */)
     {
       ptrdiff_t it_start, it_overshoot_count = 0;
       int first_x;
-      int overshoot_handled = 0;
-      int disp_string_at_start_p = 0;
+      bool overshoot_handled = 0;
+      bool disp_string_at_start_p = 0;
 
       itdata = bidi_shelve_cache ();
       SET_TEXT_POS (pt, PT, PT_BYTE);
diff --git a/src/indent.h b/src/indent.h
index e198137a756..abcd06036d1 100644
--- a/src/indent.h
+++ b/src/indent.h
@@ -27,7 +27,7 @@ struct position
   };
 
 struct position *compute_motion (ptrdiff_t from, EMACS_INT fromvpos,
-                                 EMACS_INT fromhpos, int did_motion,
+                                 EMACS_INT fromhpos, bool did_motion,
                                  ptrdiff_t to, EMACS_INT tovpos,
                                  EMACS_INT tohpos,
                                  EMACS_INT width, ptrdiff_t hscroll,
@@ -45,8 +45,8 @@ extern ptrdiff_t last_known_column_point;
 /* Return true if the display table DISPTAB specifies the same widths
    for characters as WIDTHTAB.  We use this to decide when to
    invalidate the buffer's column_cache.  */
-int disptab_matches_widthtab (struct Lisp_Char_Table *disptab,
-                              struct Lisp_Vector *widthtab);
+bool disptab_matches_widthtab (struct Lisp_Char_Table *disptab,
+                               struct Lisp_Vector *widthtab);
 
 /* Recompute BUF's width table, using the display table DISPTAB.  */
 void recompute_width_table (struct buffer *buf,
diff --git a/src/keyboard.c b/src/keyboard.c
index 8b1113a026a..f3d7df5e98f 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -19,6 +19,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
+#define BLOCKINPUT_INLINE EXTERN_INLINE
 #define KEYBOARD_INLINE EXTERN_INLINE
 
 #include <stdio.h>
@@ -72,19 +73,12 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Variables for blockinput.h: */
 
-/* Non-zero if interrupt input is blocked right now.  */
+/* Positive if interrupt input is blocked right now.  */
 volatile int interrupt_input_blocked;
 
-/* Nonzero means an input interrupt has arrived
-   during the current critical section.  */
-int interrupt_input_pending;
-
-/* This var should be (interrupt_input_pending || pending_atimers).
-   The QUIT macro checks this instead of interrupt_input_pending and
-   pending_atimers separately, to reduce code size.  So, any code that
-   changes interrupt_input_pending or pending_atimers should update
-   this too.  */
-int pending_signals;
+/* Nonzero means an input interrupt or alarm signal has arrived.
+   The QUIT macro checks this.  */
+volatile int pending_signals;
 
 #define KBD_BUFFER_SIZE 4096
 
@@ -225,7 +219,11 @@ static Lisp_Object last_point_position_window;
    last event came from a macro.  We use this to determine when to
    generate switch-frame events.  This may be cleared by functions
    like Fselect_frame, to make sure that a switch-frame event is
-   generated by the next character.  */
+   generated by the next character.
+
+   FIXME: This is modified by a signal handler so it should be volatile.
+   It's exported to Lisp, though, so it can't simply be marked
+   'volatile' here.  */
 Lisp_Object internal_last_event_frame;
 
 /* The timestamp of the last input event we received from the X server.
@@ -389,7 +387,7 @@ int interrupts_deferred;
 
 /* If we support a window system, turn on the code to poll periodically
    to detect C-g.  It isn't actually used when doing interrupt input.  */
-#if defined (HAVE_WINDOW_SYSTEM) && !defined (USE_ASYNC_EVENTS)
+#ifdef HAVE_WINDOW_SYSTEM
 #define POLL_FOR_INPUT
 #endif
 
@@ -413,7 +411,6 @@ static EMACS_TIME timer_last_idleness_start_time;
 /* Function for init_keyboard to call with no args (if nonzero).  */
 static void (*keyboard_init_hook) (void);
 
-static int read_avail_input (void);
 static void get_input_pending (int *, int);
 static int readable_events (int);
 static Lisp_Object read_char_x_menu_prompt (ptrdiff_t, Lisp_Object *,
@@ -440,7 +437,7 @@ static Lisp_Object restore_kboard_configuration (Lisp_Object);
 #ifdef USABLE_SIGIO
 static void deliver_input_available_signal (int signo);
 #endif
-static void handle_interrupt (void);
+static void handle_interrupt (bool);
 static _Noreturn void quit_throw_to_read_char (int);
 static void process_special_events (void);
 static void timer_start_idle (void);
@@ -823,7 +820,7 @@ This function is called by the editor initialization to begin editing.  */)
 
   /* If we enter while input is blocked, don't lock up here.
      This may happen through the debugger during redisplay.  */
-  if (INPUT_BLOCKED_P)
+  if (input_blocked_p ())
     return Qnil;
 
   command_loop_level++;
@@ -1216,8 +1213,7 @@ This also exits all active minibuffers.  */)
 
   /* Unblock input if we enter with input blocked.  This may happen if
      redisplay traps e.g. during tool-bar update with input blocked.  */
-  while (INPUT_BLOCKED_P)
-    UNBLOCK_INPUT;
+  totally_unblock_input ();
 
   Fthrow (Qtop_level, Qnil);
 }
@@ -1460,15 +1456,6 @@ command_loop_1 (void)
             }
         }
 
-#if 0
-      /* Select the frame that the last event came from.  Usually,
-         switch-frame events will take care of this, but if some lisp
-         code swallows a switch-frame event, we'll fix things up here.
-         Is this a good idea?  */
-      if (FRAMEP (internal_last_event_frame)
-          && !EQ (internal_last_event_frame, selected_frame))
-        Fselect_frame (internal_last_event_frame, Qnil);
-#endif
       /* If it has changed current-menubar from previous value,
          really recompute the menubar from the value.  */
       if (! NILP (Vlucid_menu_bar_dirty_flag)
@@ -2008,9 +1995,9 @@ static struct atimer *poll_timer;
 void
 poll_for_input_1 (void)
 {
-  if (interrupt_input_blocked == 0
+  if (! input_blocked_p ()
       && !waiting_for_input)
-    read_avail_input ();
+    gobble_input ();
 }
 
 /* Timer callback function for poll_timer.  TIMER is equal to
@@ -2020,10 +2007,7 @@ static void
 poll_for_input (struct atimer *timer)
 {
   if (poll_suppress_count == 0)
-    {
-      interrupt_input_pending = 1;
-      pending_signals = 1;
-    }
+    pending_signals = 1;
 }
 
 #endif /* POLL_FOR_INPUT */
@@ -3344,7 +3328,7 @@ record_char (Lisp_Object c)
      If you, dear reader, have a better idea, you've got the source.  :-) */
   if (dribble)
     {
-      BLOCK_INPUT;
+      block_input ();
       if (INTEGERP (c))
         {
           if (XUINT (c) < 0x100)
@@ -3370,7 +3354,7 @@ record_char (Lisp_Object c)
         }
 
       fflush (dribble);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -3514,10 +3498,8 @@ kbd_buffer_store_event (register struct input_event *event)
    Else, if EVENT is a quit event, store the quit event
    in HOLD_QUIT, and return (thus ignoring further events).
 
-   This is used in read_avail_input to postpone the processing
-   of the quit event until all subsequent input events have been
-   parsed (and discarded).
- */
+   This is used to postpone the processing of the quit event until all
+   subsequent input events have been parsed (and discarded).  */
 
 void
 kbd_buffer_store_event_hold (register struct input_event *event,
@@ -3587,7 +3569,8 @@ kbd_buffer_store_event_hold (register struct input_event *event,
           }
 
           last_event_timestamp = event->timestamp;
-          handle_interrupt ();
+
+          handle_interrupt (0);
           return;
         }
 
@@ -3643,7 +3626,6 @@ kbd_buffer_store_event_hold (register struct input_event *event,
       if (immediate_quit && NILP (Vinhibit_quit))
         {
           immediate_quit = 0;
-          pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
           QUIT;
         }
     }
@@ -3793,14 +3775,6 @@ kbd_buffer_get_event (KBOARD **kbp,
       /* Start reading input again, we have processed enough so we can
          accept new events again.  */
       unhold_keyboard_input ();
-#ifdef USABLE_SIGIO
-      if (!noninteractive)
-        {
-          struct sigaction action;
-          emacs_sigaction_init (&action, deliver_input_available_signal);
-          sigaction (SIGIO, &action, 0);
-        }
-#endif
       start_polling ();
     }
 #endif  /* subprocesses */
@@ -3869,7 +3843,7 @@ kbd_buffer_get_event (KBOARD **kbp,
         wait_reading_process_output (0, 0, -1, 1, Qnil, NULL, 0);
 
       if (!interrupt_input && kbd_fetch_ptr == kbd_store_ptr)
-        read_avail_input ();
+        gobble_input ();
     }
 
   if (CONSP (Vunread_command_events))
@@ -4496,6 +4470,9 @@ timer_check (void)
   Lisp_Object timers, idle_timers;
   struct gcpro gcpro1, gcpro2;
 
+  Lisp_Object tem = Vinhibit_quit;
+  Vinhibit_quit = Qt;
+
   /* We use copies of the timers' lists to allow a timer to add itself
      again, without locking up Emacs if the newly added timer is
      already ripe when added.  */
@@ -4508,6 +4485,8 @@ timer_check (void)
   else
     idle_timers = Qnil;
 
+  Vinhibit_quit = tem;
+
   GCPRO2 (timers, idle_timers);
 
   do
@@ -6747,41 +6726,6 @@ get_input_pending (int *addr, int flags)
   *addr = (!NILP (Vquit_flag) || readable_events (flags));
 }
 
-/* Interface to read_avail_input, blocking SIGIO or SIGALRM if necessary.  */
-
-void
-gobble_input (void)
-{
-#ifdef USABLE_SIGIO
-  if (interrupt_input)
-    {
-      sigset_t blocked, procmask;
-      sigemptyset (&blocked);
-      sigaddset (&blocked, SIGIO);
-      pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
-      read_avail_input ();
-      pthread_sigmask (SIG_SETMASK, &procmask, 0);
-    }
-  else
-#ifdef POLL_FOR_INPUT
-  /* XXX This condition was (read_socket_hook && !interrupt_input),
-     but read_socket_hook is not global anymore.  Let's pretend that
-     it's always set.  */
-  if (!interrupt_input && poll_suppress_count == 0)
-    {
-      sigset_t blocked, procmask;
-      sigemptyset (&blocked);
-      sigaddset (&blocked, SIGALRM);
-      pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
-      read_avail_input ();
-      pthread_sigmask (SIG_SETMASK, &procmask, 0);
-    }
-  else
-#endif
-#endif
-    read_avail_input ();
-}
-
 /* Put a BUFFER_SWITCH_EVENT in the buffer
    so that read_key_sequence will notice the new current buffer.  */
 
@@ -6809,14 +6753,7 @@ record_asynch_buffer_change (void)
   /* Make sure no interrupt happens while storing the event.  */
 #ifdef USABLE_SIGIO
   if (interrupt_input)
-    {
-      sigset_t blocked, procmask;
-      sigemptyset (&blocked);
-      sigaddset (&blocked, SIGIO);
-      pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
-      kbd_buffer_store_event (&event);
-      pthread_sigmask (SIG_SETMASK, &procmask, 0);
-    }
+    kbd_buffer_store_event (&event);
   else
 #endif
     {
@@ -6829,13 +6766,11 @@ record_asynch_buffer_change (void)
 /* Read any terminal input already buffered up by the system
    into the kbd_buffer, but do not wait.
 
-   EXPECTED should be nonzero if the caller knows there is some input.
-
-   Returns the number of keyboard chars read, or -1 meaning
+   Return the number of keyboard chars read, or -1 meaning
    this is a bad time to try to read input.  */
 
-static int
-read_avail_input (void)
+int
+gobble_input (void)
 {
   int nread = 0;
   int err = 0;
@@ -6855,11 +6790,17 @@ read_avail_input (void)
           int nr;
           struct input_event hold_quit;
 
+          if (input_blocked_p ())
+            {
+              pending_signals = 1;
+              break;
+            }
+
           EVENT_INIT (hold_quit);
           hold_quit.kind = NO_EVENT;
 
           /* No need for FIONREAD or fcntl; just say don't wait.  */
-          while (0 < (nr = (*t->read_socket_hook) (t, &hold_quit)))
+          while (0 < (nr = (*t->read_socket_hook) (t, &hold_quit)))
             nread += nr;
 
           if (nr == -1)          /* Not OK to read input now.  */
@@ -6880,7 +6821,7 @@ read_avail_input (void)
                    this process rather than to the whole process
                    group?  Perhaps on systems with FIONREAD Emacs is
                    alone in its group.  */
-                kill (getpid (), SIGHUP);
+                terminate_due_to_signal (SIGHUP, 10);
 
               /* XXX Is calling delete_terminal safe here?  It calls delete_frame.  */
               {
@@ -7169,34 +7110,68 @@ tty_read_avail_input (struct terminal *terminal,
 static void
 handle_async_input (void)
 {
-  interrupt_input_pending = 0;
-  pending_signals = pending_atimers;
-
+#ifdef USABLE_SIGIO
   while (1)
     {
-      int nread = read_avail_input ();
+      int nread = gobble_input ();
       /* -1 means it's not ok to read the input now.
          UNBLOCK_INPUT will read it later; now, avoid infinite loop.
          0 means there was no keyboard input available.  */
       if (nread <= 0)
         break;
     }
+#endif
 }
 
 void
 process_pending_signals (void)
 {
-  if (interrupt_input_pending)
-    handle_async_input ();
+  pending_signals = 0;
+  handle_async_input ();
   do_pending_atimers ();
 }
 
+/* Undo any number of BLOCK_INPUT calls down to level LEVEL,
+   and also (if the level is now 0) reinvoke any pending signal.  */
+
+void
+unblock_input_to (int level)
+{
+  interrupt_input_blocked = level;
+  if (level == 0)
+    {
+      if (pending_signals)
+        process_pending_signals ();
+    }
+  else if (level < 0)
+    emacs_abort ();
+}
+
+/* End critical section.
+
+   If doing signal-driven input, and a signal came in when input was
+   blocked, reinvoke the signal handler now to deal with it.  */
+
+void
+unblock_input (void)
+{
+  unblock_input_to (interrupt_input_blocked - 1);
+}
+
+/* Undo any number of BLOCK_INPUT calls,
+   and also reinvoke any pending signal.  */
+
+void
+totally_unblock_input (void)
+{
+  unblock_input_to (0);
+}
+
 #ifdef USABLE_SIGIO
 
-static void
+void
 handle_input_available_signal (int sig)
 {
-  interrupt_input_pending = 1;
   pending_signals = 1;
 
   if (input_available_clear_time)
@@ -7206,25 +7181,10 @@ handle_input_available_signal (int sig)
 static void
 deliver_input_available_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_input_available_signal);
+  deliver_process_signal (sig, handle_input_available_signal);
 }
 #endif /* USABLE_SIGIO */
 
-/* Send ourselves a SIGIO.
-
-   This function exists so that the UNBLOCK_INPUT macro in
-   blockinput.h can have some way to take care of input we put off
-   dealing with, without assuming that every file which uses
-   UNBLOCK_INPUT also has #included the files necessary to get SIGIO.  */
-void
-reinvoke_input_signal (void)
-{
-#ifdef USABLE_SIGIO
-  handle_async_input ();
-#endif
-}
-
-
 
 /* User signal events.  */
 
@@ -7295,7 +7255,7 @@ handle_user_signal (int sig)
         p->npending++;
 #ifdef USABLE_SIGIO
         if (interrupt_input)
-          kill (getpid (), SIGIO);
+          handle_input_available_signal (sig);
         else
 #endif
           {
@@ -7311,7 +7271,7 @@ handle_user_signal (int sig)
 static void
 deliver_user_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_user_signal);
+  deliver_process_signal (sig, handle_user_signal);
 }
 
 static char *
@@ -7336,8 +7296,6 @@ store_user_signal_events (void)
   for (p = user_signals; p; p = p->next)
     if (p->npending > 0)
       {
-        sigset_t blocked, procmask;
-
         if (! buf_initialized)
           {
             memset (&buf, 0, sizeof buf);
@@ -7346,10 +7304,6 @@ store_user_signal_events (void)
             buf_initialized = 1;
           }
 
-        sigemptyset (&blocked);
-        sigaddset (&blocked, p->sig);
-        pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
-
         do
           {
             buf.code = p->sig;
@@ -7357,8 +7311,6 @@ store_user_signal_events (void)
             p->npending--;
           }
         while (p->npending > 0);
-
-        pthread_sigmask (SIG_SETMASK, &procmask, 0);
       }
 }
 
@@ -10563,9 +10515,9 @@ The file will be closed when Emacs exits.  */)
 {
   if (dribble)
     {
-      BLOCK_INPUT;
+      block_input ();
       fclose (dribble);
-      UNBLOCK_INPUT;
+      unblock_input ();
       dribble = 0;
     }
   if (!NILP (file))
@@ -10754,21 +10706,21 @@ handle_interrupt_signal (int sig)
          from the controlling tty.  */
       internal_last_event_frame = terminal->display_info.tty->top_frame;
 
-      handle_interrupt ();
+      handle_interrupt (1);
     }
 }
 
 static void
 deliver_interrupt_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_interrupt_signal);
+  deliver_process_signal (sig, handle_interrupt_signal);
 }
 
 
 /* If Emacs is stuck because `inhibit-quit' is true, then keep track
    of the number of times C-g has been requested.  If C-g is pressed
    enough times, then quit anyway.  See bug#6585.  */
-static int force_quit_count;
+static int volatile force_quit_count;
 
 /* This routine is called at interrupt level in response to C-g.
 
@@ -10782,7 +10734,7 @@ static int force_quit_count;
    non-nil, it stops the job right away.  */
 
 static void
-handle_interrupt (void)
+handle_interrupt (bool in_signal_handler)
 {
   char c;
 
@@ -10791,13 +10743,16 @@ handle_interrupt (void)
   /* XXX This code needs to be revised for multi-tty support.  */
   if (!NILP (Vquit_flag) && get_named_tty ("/dev/tty"))
     {
-      /* If SIGINT isn't blocked, don't let us be interrupted by
-         another SIGINT, it might be harmful due to non-reentrancy
-         in I/O functions.  */
-      sigset_t blocked;
-      sigemptyset (&blocked);
-      sigaddset (&blocked, SIGINT);
-      pthread_sigmask (SIG_BLOCK, &blocked, 0);
+      if (! in_signal_handler)
+        {
+          /* If SIGINT isn't blocked, don't let us be interrupted by
+             a SIGINT.  It might be harmful due to non-reentrancy
+             in I/O functions.  */
+          sigset_t blocked;
+          sigemptyset (&blocked);
+          sigaddset (&blocked, SIGINT);
+          pthread_sigmask (SIG_BLOCK, &blocked, 0);
+        }
 
       fflush (stdout);
       reset_all_sys_modes ();
@@ -10868,7 +10823,6 @@ handle_interrupt (void)
 #endif /* not MSDOS */
       fflush (stdout);
       init_all_sys_modes ();
-      pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
     }
   else
     {
@@ -10886,15 +10840,14 @@ handle_interrupt (void)
           GCPRO4 (saved.object, saved.global_code,
                   saved.current_syntax_table, saved.old_prop);
           Fsignal (Qquit, Qnil);
-          /* FIXME: AFAIK, `quit' can never return, so this code is dead!  */
           gl_state = saved;
           UNGCPRO;
         }
       else
         { /* Else request quit when it's safe.  */
-          if (NILP (Vquit_flag))
-            force_quit_count = 0;
-          if (++force_quit_count == 3)
+          int count = NILP (Vquit_flag) ? 1 : force_quit_count + 1;
+          force_quit_count = count;
+          if (count == 3)
             {
               immediate_quit = 1;
               Vinhibit_quit = Qnil;
@@ -10903,6 +10856,8 @@ handle_interrupt (void)
         }
     }
 
+  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
+
 /* TODO: The longjmp in this call throws the NS event loop integration off,
          and it seems to do fine without this.  Probably some attention
          needs to be paid to the setting of waiting_for_input in
@@ -10912,7 +10867,7 @@ handle_interrupt (void)
          separate event loop thread like W32.  */
 #ifndef HAVE_NS
   if (waiting_for_input && !echoing)
-      quit_throw_to_read_char (1);
+    quit_throw_to_read_char (in_signal_handler);
 #endif
 }
 
@@ -10926,22 +10881,12 @@ quit_throw_to_read_char (int from_signal)
   if (!from_signal && EQ (Vquit_flag, Qkill_emacs))
     Fkill_emacs (Qnil);
 
-  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
   /* Prevent another signal from doing this before we finish.  */
   clear_waiting_for_input ();
   input_pending = 0;
 
   Vunread_command_events = Qnil;
 
-#if 0 /* Currently, sit_for is called from read_char without turning
-         off polling.  And that can call set_waiting_for_input.
-         It seems to be harmless.  */
-#ifdef POLL_FOR_INPUT
-  /* May be > 1 if in recursive minibuffer.  */
-  if (poll_suppress_count == 0)
-    emacs_abort ();
-#endif
-#endif
   if (FRAMEP (internal_last_event_frame)
       && !EQ (internal_last_event_frame, selected_frame))
     do_switch_frame (make_lispy_switch_frame (internal_last_event_frame),
@@ -11332,7 +11277,6 @@ init_keyboard (void)
 #endif
   input_pending = 0;
   interrupt_input_blocked = 0;
-  interrupt_input_pending = 0;
   pending_signals = 0;
 
   /* This means that command_loop_1 won't try to select anything the first
@@ -11353,7 +11297,7 @@ init_keyboard (void)
       /* Before multi-tty support, these handlers used to be installed
          only if the current session was a tty session.  Now an Emacs
          session may have multiple display types, so we always handle
-         SIGINT.  There is special code in interrupt_signal to exit
+         SIGINT.  There is special code in handle_interrupt_signal to exit
          Emacs on SIGINT when there are no termcap frames on the
          controlling terminal.  */
       struct sigaction action;
diff --git a/src/keyboard.h b/src/keyboard.h
index 3601f68be9f..bc35bba4ecc 100644
--- a/src/keyboard.h
+++ b/src/keyboard.h
@@ -523,7 +523,7 @@ extern void input_poll_signal (int);
 extern void start_polling (void);
 extern void stop_polling (void);
 extern void set_poll_suppress_count (int);
-extern void gobble_input (void);
+extern int gobble_input (void);
 extern int input_polling_used (void);
 extern void clear_input_pending (void);
 extern int requeued_events_pending_p (void);
diff --git a/src/keymap.c b/src/keymap.c
index 66fb52061f9..6ea142651bf 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -1477,7 +1477,7 @@ current_minor_maps (Lisp_Object **modeptr, Lisp_Object **mapptr)
 
                 /* Use malloc here.  See the comment above this function.
                    Avoid realloc here; it causes spurious traps on GNU/Linux [KFS] */
-                BLOCK_INPUT;
+                block_input ();
                 newmodes = malloc (allocsize);
                 if (newmodes)
                   {
@@ -1501,7 +1501,7 @@ current_minor_maps (Lisp_Object **modeptr, Lisp_Object **mapptr)
                       }
                     cmm_maps = newmaps;
                   }
-                UNBLOCK_INPUT;
+                unblock_input ();
 
                 if (newmodes == NULL || newmaps == NULL)
                   break;
diff --git a/src/lisp.h b/src/lisp.h
index 3a473a60b48..c3cabe0af29 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -25,6 +25,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include <float.h>
 #include <inttypes.h>
 #include <limits.h>
 
@@ -1487,6 +1488,16 @@ struct Lisp_Float
 #define XFLOAT_DATA(f) (0 ? XFLOAT (f)->u.data :  XFLOAT (f)->u.data)
 #define XFLOAT_INIT(f, n) (XFLOAT (f)->u.data = (n))
 
+/* Most hosts nowadays use IEEE floating point, so they use IEC 60559
+   representations, have infinities and NaNs, and do not trap on
+   exceptions.  Define IEEE_FLOATING_POINT if this host is one of the
+   typical ones.  The C11 macro __STDC_IEC_559__ is close to what is
+   wanted here, but is not quite right because Emacs does not require
+   all the features of C11 Annex F (and does not require C11 at all,
+   for that matter).  */
+#define IEEE_FLOATING_POINT (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \
+                             && FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128)
+
 /* A character, declared with the following typedef, is a member
    of some character set associated with the current buffer.  */
 #ifndef _UCHAR_T  /* Protect against something in ctab.h on AIX.  */
@@ -2020,6 +2031,18 @@ extern ptrdiff_t specpdl_size;
 
 #define SPECPDL_INDEX() (specpdl_ptr - specpdl)
 
+struct backtrace
+{
+  struct backtrace *next;
+  Lisp_Object function;
+  Lisp_Object *args;    /* Points to vector of args.  */
+  ptrdiff_t nargs;      /* Length of vector.  */
+  /* Nonzero means call value of debugger when done with this operation.  */
+  unsigned int debug_on_exit : 1;
+};
+
+extern struct backtrace *backtrace_list;
+
 /* Everything needed to describe an active condition case.
 
    Members are volatile if their values need to survive _longjmp when
@@ -2108,7 +2131,7 @@ extern char *stack_bottom;
    a request to exit Emacs when it is safe to do.  */
 
 extern void process_pending_signals (void);
-extern int pending_signals;
+extern int volatile pending_signals;
 
 extern void process_quit_flag (void);
 #define QUIT                                            \
@@ -2633,7 +2656,6 @@ extern _Noreturn Lisp_Object wrong_type_argument (Lisp_Object, Lisp_Object);
 extern Lisp_Object do_symval_forwarding (union Lisp_Fwd *);
 extern void set_internal (Lisp_Object, Lisp_Object, Lisp_Object, bool);
 extern void syms_of_data (void);
-extern void init_data (void);
 extern void swap_in_global_binding (struct Lisp_Symbol *);
 
 /* Defined in cmds.c */
@@ -2721,6 +2743,7 @@ extern void init_fringe_once (void);
 extern Lisp_Object QCascent, QCmargin, QCrelief;
 extern Lisp_Object QCconversion;
 extern int x_bitmap_mask (struct frame *, ptrdiff_t);
+extern void reset_image_types (void);
 extern void syms_of_image (void);
 
 /* Defined in insdel.c.  */
@@ -2905,6 +2928,7 @@ build_string (const char *str)
 
 extern Lisp_Object pure_cons (Lisp_Object, Lisp_Object);
 extern void make_byte_code (struct Lisp_Vector *);
+extern Lisp_Object Qautomatic_gc;
 extern Lisp_Object Qchar_table_extra_slots;
 extern struct Lisp_Vector *allocate_vector (EMACS_INT);
 extern struct Lisp_Vector *allocate_pseudovector (int memlen, int lisplen, int tag);
@@ -3227,6 +3251,9 @@ extern int input_pending;
 extern Lisp_Object menu_bar_items (Lisp_Object);
 extern Lisp_Object tool_bar_items (Lisp_Object, int *);
 extern void discard_mouse_events (void);
+#ifdef USABLE_SIGIO
+void handle_input_available_signal (int);
+#endif
 extern Lisp_Object pending_funcalls;
 extern int detect_input_pending (void);
 extern int detect_input_pending_ignore_squeezables (void);
@@ -3244,7 +3271,7 @@ extern void keys_of_keyboard (void);
 /* Defined in indent.c.  */
 extern ptrdiff_t current_column (void);
 extern void invalidate_current_column (void);
-extern int indented_beyond_p (ptrdiff_t, ptrdiff_t, EMACS_INT);
+extern bool indented_beyond_p (ptrdiff_t, ptrdiff_t, EMACS_INT);
 extern void syms_of_indent (void);
 
 /* Defined in frame.c.  */
@@ -3269,8 +3296,11 @@ extern bool display_arg;
 extern Lisp_Object decode_env_path (const char *, const char *);
 extern Lisp_Object empty_unibyte_string, empty_multibyte_string;
 extern Lisp_Object Qfile_name_handler_alist;
-extern _Noreturn void fatal_error_backtrace (int, int);
+extern _Noreturn void terminate_due_to_signal (int, int);
 extern Lisp_Object Qkill_emacs;
+#ifdef WINDOWSNT
+extern Lisp_Object Vlibrary_cache;
+#endif
 #if HAVE_SETLOCALE
 void fixup_locale (void);
 void synchronize_system_messages_locale (void);
@@ -3407,8 +3437,6 @@ extern void init_sys_modes (struct tty_display_info *);
 extern void reset_sys_modes (struct tty_display_info *);
 extern void init_all_sys_modes (void);
 extern void reset_all_sys_modes (void);
-extern void wait_for_termination (pid_t);
-extern void interruptible_wait_for_termination (pid_t);
 extern void flush_pending_output (int) ATTRIBUTE_CONST;
 extern void child_setup_tty (int);
 extern void setup_pty (int);
@@ -3519,6 +3547,13 @@ extern int have_menus_p (void);
 void syms_of_dbusbind (void);
 #endif
 
+
+/* Defined in profiler.c.  */
+extern bool profiler_memory_running;
+extern void malloc_probe (size_t);
+extern void syms_of_profiler (void);
+
+
 #ifdef DOS_NT
 /* Defined in msdos.c, w32.c.  */
 extern char *emacs_root_dir (void);
diff --git a/src/lread.c b/src/lread.c
index 08d5f97292b..d22011be7c8 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -408,9 +408,9 @@ unreadchar (Lisp_Object readcharfun, int c)
     {
       if (load_each_byte)
         {
-          BLOCK_INPUT;
+          block_input ();
           ungetc (c, instream);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
       else
         unread_char = c;
@@ -431,28 +431,28 @@ readbyte_from_file (int c, Lisp_Object readcharfun)
 {
   if (c >= 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       ungetc (c, instream);
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
-  BLOCK_INPUT;
+  block_input ();
   c = getc (instream);
 
 #ifdef EINTR
   /* Interrupted reads have been observed while reading over the network.  */
   while (c == EOF && ferror (instream) && errno == EINTR)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       QUIT;
-      BLOCK_INPUT;
+      block_input ();
       clearerr (instream);
       c = getc (instream);
     }
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return (c == EOF ? -1 : c);
 }
@@ -753,9 +753,9 @@ DEFUN ("get-file-char", Fget_file_char, Sget_file_char, 0, 0, 0,
   (void)
 {
   register Lisp_Object val;
-  BLOCK_INPUT;
+  block_input ();
   XSETINT (val, getc (instream));
-  UNBLOCK_INPUT;
+  unblock_input ();
   return val;
 }
 
@@ -764,13 +764,30 @@ DEFUN ("get-file-char", Fget_file_char, Sget_file_char, 0, 0, 0,
 
 /* Return true if the lisp code read using READCHARFUN defines a non-nil
    `lexical-binding' file variable.  After returning, the stream is
-   positioned following the first line, if it is a comment, otherwise
-   nothing is read.  */
+   positioned following the first line, if it is a comment or #! line,
+   otherwise nothing is read.  */
 
 static int
 lisp_file_lexically_bound_p (Lisp_Object readcharfun)
 {
   int ch = READCHAR;
+
+  if (ch == '#')
+    {
+      ch = READCHAR;
+      if (ch != '!')
+        {
+          UNREAD (ch);
+          UNREAD ('#');
+          return 0;
+        }
+      while (ch != '\n' && ch != EOF)
+        ch = READCHAR;
+      if (ch == '\n') ch = READCHAR;
+      /* It is OK to leave the position after a #! line, since
+         that is what read1 does.  */
+    }
+
   if (ch != ';')
     /* The first line isn't a comment, just give up.  */
     {
@@ -1350,9 +1367,9 @@ load_unwind (Lisp_Object arg)  /* Used as unwind-protect function in load.  */
   FILE *stream = (FILE *) XSAVE_VALUE (arg)->pointer;
   if (stream != NULL)
     {
-      BLOCK_INPUT;
+      block_input ();
       fclose (stream);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   return Qnil;
 }
diff --git a/src/makefile.w32-in b/src/makefile.w32-in
index 24ecb2676da..3d1464cc742 100644
--- a/src/makefile.w32-in
+++ b/src/makefile.w32-in
@@ -125,6 +125,7 @@ OBJ2 =  $(BLD)/sysdep.$(O)		\
         $(BLD)/terminal.$(O)            \
         $(BLD)/menu.$(O)                \
         $(BLD)/xml.$(O)                 \
+        $(BLD)/profiler.$(O)            \
         $(BLD)/w32term.$(O)             \
         $(BLD)/w32xfns.$(O)             \
         $(BLD)/w32fns.$(O)              \
@@ -222,7 +223,7 @@ GLOBAL_SOURCES =   dosfns.c msdos.c \
         process.c callproc.c unexw32.c \
         region-cache.c sound.c atimer.c \
         doprnt.c intervals.c textprop.c composite.c \
-        gnutls.c xml.c
+        gnutls.c xml.c profiler.c
 SOME_MACHINE_OBJECTS = dosfns.o msdos.o \
         xterm.o xfns.o xmenu.o xselect.o xrdb.o xsmfns.o dbusbind.o
 obj = $(GLOBAL_SOURCES:.c=.o)
@@ -392,8 +393,6 @@ SYSTIME_H      = $(SRC)/systime.h \
 ATIMER_H       = $(SRC)/atimer.h \
                  $(NT_INC)/stdbool.h \
                  $(SYSTIME_H)
-BLOCKINPUT_H   = $(SRC)/blockinput.h \
-                 $(ATIMER_H)
 BUFFER_H       = $(SRC)/buffer.h \
                  $(SYSTIME_H)
 C_CTYPE_H      = $(GNU_LIB)/c-ctype.h \
@@ -467,6 +466,8 @@ SOCKET_H       = $(NT_INC)/sys/socket.h \
                  $(SRC)/w32.h
 STAT_TIME_H    = $(GNU_LIB)/stat-time.h \
                  $(NT_INC)/sys/stat.h
+SYSSIGNAL_H    = $(SRC)/syssignal.h \
+                 $(NT_INC)/stdbool.h
 SYSTTY_H       = $(SRC)/systty.h \
                  $(NT_INC)/sys/ioctl.h \
                  $(NT_INC)/unistd.h
@@ -481,11 +482,11 @@ WINDOW_H       = $(SRC)/window.h \
 
 $(BLD)/alloc.$(O) : \
         $(SRC)/alloc.c \
+        $(SRC)/blockinput.h \
         $(SRC)/puresize.h \
         $(SRC)/w32.h \
         $(NT_INC)/unistd.h \
         $(GNU_LIB)/verify.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -499,12 +500,12 @@ $(BLD)/alloc.$(O) : \
 
 $(BLD)/atimer.$(O) : \
         $(SRC)/atimer.c \
-        $(SRC)/syssignal.h \
+        $(SRC)/blockinput.h \
         $(NT_INC)/unistd.h \
         $(ATIMER_H) \
-        $(BLOCKINPUT_H) \
         $(CONFIG_H) \
         $(LISP_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H)
 
 $(BLD)/bidi.$(O) : \
@@ -517,6 +518,7 @@ $(BLD)/bidi.$(O) : \
 
 $(BLD)/buffer.$(O) : \
         $(SRC)/buffer.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/indent.h \
         $(SRC)/keymap.h \
@@ -525,7 +527,6 @@ $(BLD)/buffer.$(O) : \
         $(NT_INC)/sys/stat.h \
         $(NT_INC)/unistd.h \
         $(GNU_LIB)/verify.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -557,14 +558,14 @@ $(BLD)/callint.$(O) : \
 
 $(BLD)/callproc.$(O) : \
         $(SRC)/callproc.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/composite.h \
         $(SRC)/epaths.h \
-        $(SRC)/syssignal.h \
+        $(SRC)/syswait.h \
         $(SRC)/w32.h \
         $(NT_INC)/sys/file.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CCL_H) \
         $(CHARACTER_H) \
@@ -573,6 +574,7 @@ $(BLD)/callproc.$(O) : \
         $(FRAME_H) \
         $(LISP_H) \
         $(PROCESS_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTTY_H) \
         $(TERMHOOKS_H)
 
@@ -690,7 +692,6 @@ $(BLD)/data.$(O) : \
         $(SRC)/data.c \
         $(SRC)/keymap.h \
         $(SRC)/puresize.h \
-        $(SRC)/syssignal.h \
         $(GNU_LIB)/intprops.h \
         $(BUFFER_H) \
         $(CHARACTER_H) \
@@ -699,16 +700,17 @@ $(BLD)/data.$(O) : \
         $(FRAME_H) \
         $(KEYBOARD_H) \
         $(LISP_H) \
+        $(SYSSIGNAL_H) \
         $(TERMHOOKS_H)
 
 $(BLD)/dired.$(O) : \
         $(SRC)/dired.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/regex.h \
         $(NT_INC)/pwd.h \
         $(NT_INC)/sys/stat.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -723,15 +725,14 @@ $(BLD)/dired.$(O) : \
 
 $(BLD)/dispnew.$(O) : \
         $(SRC)/dispnew.c \
+        $(SRC)/blockinput.h \
         $(SRC)/cm.h \
         $(SRC)/commands.h \
         $(SRC)/disptab.h \
         $(SRC)/indent.h \
-        $(SRC)/syssignal.h \
         $(SRC)/termchar.h \
         $(SRC)/termopts.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -741,6 +742,7 @@ $(BLD)/dispnew.$(O) : \
         $(KEYBOARD_H) \
         $(LISP_H) \
         $(PROCESS_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H) \
         $(TERMHOOKS_H) \
         $(W32TERM_H) \
@@ -768,12 +770,12 @@ $(BLD)/doprnt.$(O) : \
 
 $(BLD)/editfns.$(O) : \
         $(SRC)/editfns.c \
+        $(SRC)/blockinput.h \
         $(NT_INC)/pwd.h \
         $(NT_INC)/unistd.h \
         $(GNU_LIB)/intprops.h \
         $(GNU_LIB)/strftime.h \
         $(GNU_LIB)/verify.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CODING_H) \
@@ -786,16 +788,17 @@ $(BLD)/editfns.$(O) : \
 
 $(BLD)/emacs.$(O) : \
         $(SRC)/emacs.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/gnutls.h \
         $(SRC)/keymap.h \
-        $(SRC)/syssignal.h \
         $(SRC)/unexec.h \
         $(SRC)/w32.h \
         $(SRC)/w32heap.h \
         $(NT_INC)/sys/file.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
+        $(GNU_LIB)/ignore-value.h \
+        $(ATIMER_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -804,6 +807,7 @@ $(BLD)/emacs.$(O) : \
         $(KEYBOARD_H) \
         $(LISP_H) \
         $(PROCESS_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTTY_H) \
         $(TERMHOOKS_H) \
         $(W32TERM_H) \
@@ -811,8 +815,8 @@ $(BLD)/emacs.$(O) : \
 
 $(BLD)/eval.$(O) : \
         $(SRC)/eval.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
-        $(BLOCKINPUT_H) \
         $(CONFIG_H) \
         $(DISPEXTERN_H) \
         $(FRAME_H) \
@@ -821,11 +825,11 @@ $(BLD)/eval.$(O) : \
 
 $(BLD)/fileio.$(O) : \
         $(SRC)/fileio.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(NT_INC)/pwd.h \
         $(NT_INC)/sys/stat.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CODING_H) \
@@ -858,17 +862,16 @@ $(BLD)/firstfile.$(O) : \
 
 $(BLD)/floatfns.$(O) : \
         $(SRC)/floatfns.c \
-        $(SRC)/syssignal.h \
         $(CONFIG_H) \
         $(LISP_H)
 
 $(BLD)/fns.$(O) : \
         $(SRC)/fns.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/keymap.h \
         $(NT_INC)/unistd.h \
         $(GNU_LIB)/intprops.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CODING_H) \
@@ -902,8 +905,8 @@ $(BLD)/font.$(O) : \
 
 $(BLD)/fontset.$(O) : \
         $(SRC)/fontset.c \
+        $(SRC)/blockinput.h \
         $(SRC)/fontset.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CCL_H) \
         $(CHARACTER_H) \
@@ -921,10 +924,10 @@ $(BLD)/fontset.$(O) : \
 
 $(BLD)/frame.$(O) : \
         $(SRC)/frame.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/fontset.h \
         $(SRC)/termchar.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -940,7 +943,7 @@ $(BLD)/frame.$(O) : \
 
 $(BLD)/fringe.$(O) : \
         $(SRC)/fringe.c \
-        $(BLOCKINPUT_H) \
+        $(SRC)/blockinput.h \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -971,12 +974,19 @@ $(BLD)/xml.$(O) : \
         $(CONFIG_H) \
         $(LISP_H)
 
+$(BLD)/profiler.$(O) : \
+        $(SRC)/profiler.c \
+        $(CONFIG_H) \
+        $(LISP_H) \
+        $(SYSSIGNAL_H) \
+        $(SYSTIME_H)
+
 $(BLD)/image.$(O) : \
         $(SRC)/image.c \
+        $(SRC)/blockinput.h \
         $(SRC)/epaths.h \
         $(SRC)/w32.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(CHARACTER_H) \
         $(CODING_H) \
         $(CONFIG_H) \
@@ -1011,9 +1021,9 @@ $(BLD)/indent.$(O) : \
 
 $(BLD)/insdel.$(O) : \
         $(SRC)/insdel.c \
+        $(SRC)/blockinput.h \
         $(SRC)/region-cache.h \
         $(GNU_LIB)/intprops.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -1035,19 +1045,18 @@ $(BLD)/intervals.$(O) : \
 
 $(BLD)/keyboard.$(O) : \
         $(SRC)/keyboard.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/disptab.h \
         $(SRC)/keymap.h \
         $(SRC)/macros.h \
         $(SRC)/puresize.h \
         $(SRC)/syntax.h \
-        $(SRC)/syssignal.h \
         $(SRC)/termchar.h \
         $(SRC)/termopts.h \
         $(NT_INC)/sys/ioctl.h \
         $(NT_INC)/unistd.h \
         $(ATIMER_H) \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -1057,6 +1066,7 @@ $(BLD)/keyboard.$(O) : \
         $(KEYBOARD_H) \
         $(LISP_H) \
         $(PROCESS_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H) \
         $(TERMHOOKS_H) \
         $(W32TERM_H) \
@@ -1064,10 +1074,10 @@ $(BLD)/keyboard.$(O) : \
 
 $(BLD)/keymap.$(O) : \
         $(SRC)/keymap.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/keymap.h \
         $(SRC)/puresize.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1085,12 +1095,12 @@ $(BLD)/lastfile.$(O) : \
 
 $(BLD)/lread.$(O) : \
         $(SRC)/lread.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/epaths.h \
         $(NT_INC)/sys/file.h \
         $(NT_INC)/sys/stat.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1123,8 +1133,8 @@ $(BLD)/marker.$(O) : \
 
 $(BLD)/menu.$(O) : \
         $(SRC)/menu.c \
+        $(SRC)/blockinput.h \
         $(SRC)/keymap.h \
-        $(BLOCKINPUT_H) \
         $(CONFIG_H) \
         $(DISPEXTERN_H) \
         $(FRAME_H) \
@@ -1178,10 +1188,10 @@ $(BLD)/w32heap.$(O) : \
 
 $(BLD)/w32inevt.$(O) : \
         $(SRC)/w32inevt.c \
+        $(SRC)/blockinput.h \
         $(SRC)/termchar.h \
         $(SRC)/w32heap.h \
         $(SRC)/w32inevt.h \
-        $(BLOCKINPUT_H) \
         $(CONFIG_H) \
         $(DISPEXTERN_H) \
         $(FRAME_H) \
@@ -1193,7 +1203,6 @@ $(BLD)/w32inevt.$(O) : \
 
 $(BLD)/w32proc.$(O) : \
         $(SRC)/w32proc.c \
-        $(SRC)/syssignal.h \
         $(SRC)/syswait.h \
         $(SRC)/w32.h \
         $(SRC)/w32heap.h \
@@ -1205,6 +1214,7 @@ $(BLD)/w32proc.$(O) : \
         $(LANGINFO_H) \
         $(LISP_H) \
         $(PROCESS_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H) \
         $(W32TERM_H)
 
@@ -1225,8 +1235,8 @@ $(BLD)/w32console.$(O) : \
 
 $(BLD)/print.$(O) : \
         $(SRC)/print.c \
+        $(SRC)/blockinput.h \
         $(SRC)/termchar.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1244,11 +1254,11 @@ $(BLD)/print.$(O) : \
 
 $(BLD)/process.$(O) : \
         $(SRC)/process.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/composite.h \
         $(SRC)/gnutls.h \
         $(SRC)/sysselect.h \
-        $(SRC)/syssignal.h \
         $(SRC)/syswait.h \
         $(SRC)/termopts.h \
         $(NT_INC)/arpa/inet.h \
@@ -1259,7 +1269,6 @@ $(BLD)/process.$(O) : \
         $(NT_INC)/sys/stat.h \
         $(NT_INC)/unistd.h \
         $(ATIMER_H) \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CODING_H) \
@@ -1270,6 +1279,7 @@ $(BLD)/process.$(O) : \
         $(LISP_H) \
         $(PROCESS_H) \
         $(SOCKET_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H) \
         $(SYSTTY_H) \
         $(TERMHOOKS_H) \
@@ -1278,9 +1288,9 @@ $(BLD)/process.$(O) : \
 
 $(BLD)/ralloc.$(O) : \
         $(SRC)/ralloc.c \
+        $(SRC)/blockinput.h \
         $(SRC)/getpagesize.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(CONFIG_H) \
         $(LISP_H)
 
@@ -1315,12 +1325,12 @@ $(BLD)/scroll.$(O) : \
 
 $(BLD)/search.$(O) : \
         $(SRC)/search.c \
+        $(SRC)/blockinput.h \
         $(SRC)/category.h \
         $(SRC)/commands.h \
         $(SRC)/regex.h \
         $(SRC)/region-cache.h \
         $(SRC)/syntax.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1330,12 +1340,12 @@ $(BLD)/search.$(O) : \
 
 $(BLD)/sound.$(O) : \
         $(SRC)/sound.c \
-        $(SRC)/syssignal.h \
         $(NT_INC)/unistd.h \
         $(ATIMER_H) \
         $(CONFIG_H) \
         $(DISPEXTERN_H) \
-        $(LISP_H)
+        $(LISP_H) \
+        $(SYSSIGNAL_H)
 
 $(BLD)/syntax.$(O) : \
         $(SRC)/syntax.c \
@@ -1352,9 +1362,9 @@ $(BLD)/syntax.$(O) : \
 
 $(BLD)/sysdep.$(O) : \
         $(SRC)/sysdep.c \
+        $(SRC)/blockinput.h \
         $(SRC)/cm.h \
         $(SRC)/sysselect.h \
-        $(SRC)/syssignal.h \
         $(SRC)/syswait.h \
         $(SRC)/termchar.h \
         $(SRC)/termopts.h \
@@ -1367,7 +1377,6 @@ $(BLD)/sysdep.$(O) : \
         $(GNU_LIB)/execinfo.h \
         $(GNU_LIB)/ignore-value.h \
         $(GNU_LIB)/utimens.h \
-        $(BLOCKINPUT_H) \
         $(CAREADLINKAT_H) \
         $(CONFIG_H) \
         $(C_CTYPE_H) \
@@ -1378,6 +1387,7 @@ $(BLD)/sysdep.$(O) : \
         $(LISP_H) \
         $(PROCESS_H) \
         $(SOCKET_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTIME_H) \
         $(SYSTTY_H) \
         $(TERMHOOKS_H) \
@@ -1385,18 +1395,17 @@ $(BLD)/sysdep.$(O) : \
 
 $(BLD)/term.$(O) : \
         $(SRC)/term.c \
+        $(SRC)/blockinput.h \
         $(SRC)/cm.h \
         $(SRC)/composite.h \
         $(SRC)/disptab.h \
         $(SRC)/keymap.h \
-        $(SRC)/syssignal.h \
         $(SRC)/termchar.h \
         $(SRC)/termopts.h \
         $(SRC)/tparam.h \
         $(NT_INC)/sys/file.h \
         $(NT_INC)/sys/time.h \
         $(NT_INC)/unistd.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1407,6 +1416,7 @@ $(BLD)/term.$(O) : \
         $(INTERVALS_H) \
         $(KEYBOARD_H) \
         $(LISP_H) \
+        $(SYSSIGNAL_H) \
         $(SYSTTY_H) \
         $(TERMHOOKS_H) \
         $(WINDOW_H)
@@ -1461,12 +1471,12 @@ $(BLD)/vm-limit.$(O) : \
 
 $(BLD)/window.$(O) : \
         $(SRC)/window.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/disptab.h \
         $(SRC)/indent.h \
         $(SRC)/keymap.h \
         $(SRC)/termchar.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CONFIG_H) \
@@ -1481,6 +1491,7 @@ $(BLD)/window.$(O) : \
 
 $(BLD)/xdisp.$(O) : \
         $(SRC)/xdisp.c \
+        $(SRC)/blockinput.h \
         $(SRC)/commands.h \
         $(SRC)/disptab.h \
         $(SRC)/fontset.h \
@@ -1490,7 +1501,7 @@ $(BLD)/xdisp.$(O) : \
         $(SRC)/region-cache.h \
         $(SRC)/termchar.h \
         $(SRC)/termopts.h \
-        $(BLOCKINPUT_H) \
+        $(ATIMER_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1509,10 +1520,10 @@ $(BLD)/xdisp.$(O) : \
 
 $(BLD)/xfaces.$(O) : \
         $(SRC)/xfaces.c \
+        $(SRC)/blockinput.h \
         $(SRC)/fontset.h \
         $(SRC)/termchar.h \
         $(NT_INC)/sys/stat.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1530,11 +1541,11 @@ $(BLD)/xfaces.$(O) : \
 
 $(BLD)/w32fns.$(O) : \
         $(SRC)/w32fns.c \
+        $(SRC)/blockinput.h \
         $(SRC)/epaths.h \
         $(SRC)/fontset.h \
         $(SRC)/w32.h \
         $(SRC)/w32heap.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CCL_H) \
         $(CHARACTER_H) \
@@ -1555,9 +1566,9 @@ $(BLD)/w32fns.$(O) : \
 
 $(BLD)/w32menu.$(O) : \
         $(SRC)/w32menu.c \
+        $(SRC)/blockinput.h \
         $(SRC)/keymap.h \
         $(SRC)/w32heap.h \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CHARACTER_H) \
         $(CHARSET_H) \
@@ -1574,6 +1585,7 @@ $(BLD)/w32menu.$(O) : \
 
 $(BLD)/w32term.$(O) : \
         $(SRC)/w32term.c \
+        $(SRC)/blockinput.h \
         $(SRC)/disptab.h \
         $(SRC)/fontset.h \
         $(SRC)/keymap.h \
@@ -1582,7 +1594,6 @@ $(BLD)/w32term.$(O) : \
         $(SRC)/w32heap.h \
         $(NT_INC)/sys/stat.h \
         $(ATIMER_H) \
-        $(BLOCKINPUT_H) \
         $(BUFFER_H) \
         $(CCL_H) \
         $(CHARACTER_H) \
@@ -1605,9 +1616,9 @@ $(BLD)/w32term.$(O) : \
 
 $(BLD)/w32select.$(O) : \
         $(SRC)/w32select.c \
+        $(SRC)/blockinput.h \
         $(SRC)/composite.h \
         $(SRC)/w32heap.h \
-        $(BLOCKINPUT_H) \
         $(CHARSET_H) \
         $(CODING_H) \
         $(CONFIG_H) \
@@ -1616,15 +1627,15 @@ $(BLD)/w32select.$(O) : \
 
 $(BLD)/w32reg.$(O) : \
         $(SRC)/w32reg.c \
-        $(BLOCKINPUT_H) \
+        $(SRC)/blockinput.h \
         $(CONFIG_H) \
         $(LISP_H) \
         $(W32TERM_H)
 
 $(BLD)/w32xfns.$(O) : \
         $(SRC)/w32xfns.c \
+        $(SRC)/blockinput.h \
         $(SRC)/fontset.h \
-        $(BLOCKINPUT_H) \
         $(CHARSET_H) \
         $(CONFIG_H) \
         $(FRAME_H) \
diff --git a/src/menu.c b/src/menu.c
index 7b01d1faefc..5374aa9157a 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -573,9 +573,9 @@ xmalloc_widget_value (void)
 {
   widget_value *value;
 
-  BLOCK_INPUT;
+  block_input ();
   value = malloc_widget_value ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return value;
 }
@@ -602,9 +602,9 @@ free_menubar_widget_value_tree (widget_value *wv)
       free_menubar_widget_value_tree (wv->next);
       wv->next = (widget_value *) 0xDEADBEEF;
     }
-  BLOCK_INPUT;
+  block_input ();
   free_widget_value (wv);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Create a tree of widget_value objects
@@ -1313,7 +1313,7 @@ no quit occurs and `x-popup-menu' returns nil.  */)
 #endif
 
   /* Display them in a menu.  */
-  BLOCK_INPUT;
+  block_input ();
 
   /* FIXME: Use a terminal hook!  */
 #if defined HAVE_NTGUI
@@ -1332,7 +1332,7 @@ no quit occurs and `x-popup-menu' returns nil.  */)
                           last_event_timestamp);
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
 #ifdef HAVE_NS
   unbind_to (specpdl_count, Qnil);
diff --git a/src/msdos.c b/src/msdos.c
index ed5d3240aa1..bac6b977fdf 100644
--- a/src/msdos.c
+++ b/src/msdos.c
@@ -1229,7 +1229,7 @@ IT_update_begin (struct frame *f)
   if (display_info->termscript)
     fprintf (display_info->termscript, "\n\n<UPDATE_BEGIN");
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (f && f == mouse_face_frame)
     {
@@ -1279,7 +1279,7 @@ IT_update_begin (struct frame *f)
       hlinfo->mouse_face_mouse_frame = NULL;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static void
@@ -1302,13 +1302,13 @@ IT_frame_up_to_date (struct frame *f)
   if (hlinfo->mouse_face_deferred_gc
       || (f && f == hlinfo->mouse_face_mouse_frame))
     {
-      BLOCK_INPUT;
+      block_input ();
       if (hlinfo->mouse_face_mouse_frame)
         note_mouse_highlight (hlinfo->mouse_face_mouse_frame,
                               hlinfo->mouse_face_mouse_x,
                               hlinfo->mouse_face_mouse_y);
       hlinfo->mouse_face_deferred_gc = 0;
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* Set the cursor type to whatever they wanted.  In a minibuffer
diff --git a/src/nsfns.m b/src/nsfns.m
index e2c8c3722c0..c96ec99ed2e 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -615,7 +615,7 @@ ns_set_name_as_filename (struct frame *f)
   if (f->explicit_name || ! NILP (f->title) || ns_in_resize)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
   pool = [[NSAutoreleasePool alloc] init];
   filename = BVAR (XBUFFER (buf), filename);
   name = BVAR (XBUFFER (buf), name);
@@ -640,7 +640,7 @@ ns_set_name_as_filename (struct frame *f)
   if (title && (! strcmp (title, SSDATA (encoded_name))))
     {
       [pool release];
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
@@ -678,7 +678,7 @@ ns_set_name_as_filename (struct frame *f)
     }
 
   [pool release];
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -689,11 +689,11 @@ ns_set_doc_edited (struct frame *f, Lisp_Object arg)
   NSAutoreleasePool *pool;
   if (!MINI_WINDOW_P (XWINDOW (f->selected_window)))
     {
-      BLOCK_INPUT;
+      block_input ();
       pool = [[NSAutoreleasePool alloc] init];
       [[view window] setDocumentEdited: !NILP (arg)];
       [pool release];
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -771,14 +771,14 @@ ns_implicitly_set_icon_type (struct frame *f)
 
   NSTRACE (ns_implicitly_set_icon_type);
 
-  BLOCK_INPUT;
+  block_input ();
   pool = [[NSAutoreleasePool alloc] init];
   if (f->output_data.ns->miniimage
       && [[NSString stringWithUTF8String: SSDATA (f->name)]
                isEqualToString: [(NSImage *)f->output_data.ns->miniimage name]])
     {
       [pool release];
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
@@ -786,7 +786,7 @@ ns_implicitly_set_icon_type (struct frame *f)
   if (CONSP (tem) && ! NILP (XCDR (tem)))
     {
       [pool release];
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
@@ -826,7 +826,7 @@ ns_implicitly_set_icon_type (struct frame *f)
   f->output_data.ns->miniimage = image;
   [view setMiniwindowImage: setMini];
   [pool release];
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1018,7 +1018,7 @@ frame_parm_handler ns_frame_parm_handlers[] =
   x_set_fringe_width, /* generic OK */
   x_set_fringe_width, /* generic OK */
   0, /* x_set_wait_for_wm, will ignore */
-  0,  /* x_set_fullscreen will ignore */
+  x_set_fullscreen, /* generic OK */
   x_set_font_backend, /* generic OK */
   x_set_alpha,
   0, /* x_set_sticky */
@@ -1232,7 +1232,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
   f->resx = dpyinfo->resx;
   f->resy = dpyinfo->resy;
 
-  BLOCK_INPUT;
+  block_input ();
   register_font_driver (&nsfont_driver, f);
   x_default_parameter (f, parms, Qfont_backend, Qnil,
                         "fontBackend", "FontBackend", RES_TYPE_STRING);
@@ -1247,7 +1247,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
                                  build_string ([[font fontName] UTF8String]),
                                  "font", "Font", RES_TYPE_STRING);
   }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   x_default_parameter (f, parms, Qborder_width, make_number (0),
                        "borderwidth", "BorderWidth", RES_TYPE_NUMBER);
@@ -1411,10 +1411,10 @@ FRAME nil means use the selected frame.  */)
   if (dpyinfo->x_focus_frame != f)
     {
       EmacsView *view = FRAME_NS_VIEW (f);
-      BLOCK_INPUT;
+      block_input ();
       [NSApp activateIgnoringOtherApps: YES];
       [[view window] makeKeyAndOrderFront: view];
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   return Qnil;
@@ -1511,7 +1511,7 @@ Optional arg INIT, if non-nil, provides a default file name to use.  */)
   [panel setDelegate: fileDelegate];
 
   panelOK = 0;
-  BLOCK_INPUT;
+  block_input ();
   if (NILP (mustmatch))
     {
       ret = [panel runModalForDirectory: dirS file: initS];
@@ -1528,7 +1528,7 @@ Optional arg INIT, if non-nil, provides a default file name to use.  */)
     fname = build_string ([[panel filename] UTF8String]);
 
   [[FRAME_NS_VIEW (SELECTED_FRAME ()) window] makeKeyWindow];
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return ret ? fname : Qnil;
 }
@@ -1899,7 +1899,7 @@ The optional argument FRAME is currently ignored.  */)
         error ("non-Nextstep frame used in `ns-list-colors'");
     }
 
-  BLOCK_INPUT;
+  block_input ();
 
   colorlists = [[NSColorList availableColorLists] objectEnumerator];
   while ((clist = [colorlists nextObject]))
@@ -1917,7 +1917,7 @@ The optional argument FRAME is currently ignored.  */)
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return list;
 }
@@ -2115,7 +2115,7 @@ In case the execution fails, an error is signaled. */)
   CHECK_STRING (script);
   check_ns ();
 
-  BLOCK_INPUT;
+  block_input ();
 
   as_script = script;
   as_result = &result;
@@ -2141,7 +2141,7 @@ In case the execution fails, an error is signaled. */)
   as_status = 0;
   as_script = Qnil;
   as_result = 0;
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (status == 0)
     return result;
   else if (!STRINGP (result))
@@ -2548,7 +2548,7 @@ Text larger than the specified size is clipped.  */)
   else
     CHECK_NUMBER (dy);
 
-  BLOCK_INPUT;
+  block_input ();
   if (ns_tooltip == nil)
     ns_tooltip = [[EmacsTooltip alloc] init];
   else
@@ -2563,7 +2563,7 @@ Text larger than the specified size is clipped.  */)
                   &root_x, &root_y);
 
   [ns_tooltip showAtX: root_x Y: root_y for: XINT (timeout)];
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   UNGCPRO;
   return unbind_to (count, Qnil);
diff --git a/src/nsfont.m b/src/nsfont.m
index eba1eb04765..b13c96aa6ed 100644
--- a/src/nsfont.m
+++ b/src/nsfont.m
@@ -821,7 +821,7 @@ nsfont_open (FRAME_PTR f, Lisp_Object font_entity, int pixel_size)
   font_info->glyphs = xzalloc (0x100 * sizeof *font_info->glyphs);
   font_info->metrics = xzalloc (0x100 * sizeof *font_info->metrics);
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* for metrics */
   sfont = [nsfont screenFont];
@@ -932,7 +932,7 @@ nsfont_open (FRAME_PTR f, Lisp_Object font_entity, int pixel_size)
     font->props[FONT_FULLNAME_INDEX] =
       make_unibyte_string (font_info->name, strlen (font_info->name));
   }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return font_object;
 }
@@ -1316,7 +1316,7 @@ ns_uni_to_glyphs (struct nsfont_info *font_info, unsigned char block)
     fprintf (stderr, "%p\tFinding glyphs for glyphs in block %d\n",
             font_info, block);
 
- BLOCK_INPUT;
+  block_input ();
 
 #ifdef NS_IMPL_COCOA
   if (firstTime)
@@ -1373,7 +1373,7 @@ ns_uni_to_glyphs (struct nsfont_info *font_info, unsigned char block)
 #endif
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   xfree (unichars);
 }
 
@@ -1398,7 +1398,7 @@ ns_glyph_metrics (struct nsfont_info *font_info, unsigned char block)
     numGlyphs = 0x10000;
 #endif
 
- BLOCK_INPUT;
+  block_input ();
  sfont = [font_info->nsfont screenFont];
 
   font_info->metrics[block] = xzalloc (0x100 * sizeof (struct font_metrics));
@@ -1427,7 +1427,7 @@ ns_glyph_metrics (struct nsfont_info *font_info, unsigned char block)
       metrics->ascent = r.size.height - metrics->descent;
 /*-lrint (hshrink* [sfont descender] - expand * hd/2); */
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
diff --git a/src/nsimage.m b/src/nsimage.m
index 668664c7a20..370cf832c7c 100644
--- a/src/nsimage.m
+++ b/src/nsimage.m
@@ -78,7 +78,7 @@ ns_image_from_file (Lisp_Object file)
   return [EmacsImage allocInitFromFile: file];
 }
 
-int
+bool
 ns_load_image (struct frame *f, struct image *img,
                Lisp_Object spec_file, Lisp_Object spec_data)
 {
diff --git a/src/nsmenu.m b/src/nsmenu.m
index 907d3eac622..b60cc005c5f 100644
--- a/src/nsmenu.m
+++ b/src/nsmenu.m
@@ -115,13 +115,13 @@ popup_activated (void)
 
 /* --------------------------------------------------------------------------
     Update menubar.  Three cases:
-    1) deep_p = 0, submenu = nil: Fresh switch onto a frame -- either set up
+    1) ! deep_p, submenu = nil: Fresh switch onto a frame -- either set up
        just top-level menu strings (OS X), or goto case (2) (GNUstep).
-    2) deep_p = 1, submenu = nil: Recompute all submenus.
-    3) deep_p = 1, submenu = non-nil: Update contents of a single submenu.
+    2) deep_p, submenu = nil: Recompute all submenus.
+    3) deep_p, submenu = non-nil: Update contents of a single submenu.
    -------------------------------------------------------------------------- */
 void
-ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
+ns_update_menubar (struct frame *f, bool deep_p, EmacsMenu *submenu)
 {
   NSAutoreleasePool *pool;
   id menu = [NSApp mainMenu];
@@ -146,7 +146,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
   XSETFRAME (Vmenu_updating_frame, f);
 /*fprintf (stderr, "ns_update_menubar: frame: %p\tdeep: %d\tsub: %p\n", f, deep_p, submenu); */
 
-  BLOCK_INPUT;
+  block_input ();
   pool = [[NSAutoreleasePool alloc] init];
 
   /* Menu may have been created automatically; if so, discard it. */
@@ -271,7 +271,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
           discard_menu_items ();
           unbind_to (specpdl_count, Qnil);
           [pool release];
-          UNBLOCK_INPUT;
+          unblock_input ();
           return;
         }
 
@@ -333,7 +333,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
               discard_menu_items ();
               unbind_to (specpdl_count, Qnil);
               [pool release];
-              UNBLOCK_INPUT;
+              unblock_input ();
               return;
             }
         }
@@ -404,7 +404,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
         {
           free_menubar_widget_value_tree (first_wv);
           [pool release];
-          UNBLOCK_INPUT;
+          unblock_input ();
           return;
         }
 
@@ -435,7 +435,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
             {
               free_menubar_widget_value_tree (first_wv);
               [pool release];
-              UNBLOCK_INPUT;
+              unblock_input ();
               return;
             }
         }
@@ -498,7 +498,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
     [NSApp setMainMenu: menu];
 
   [pool release];
-  UNBLOCK_INPUT;
+  unblock_input ();
 
 }
 
@@ -507,7 +507,7 @@ ns_update_menubar (struct frame *f, int deep_p, EmacsMenu *submenu)
    frame's menus have changed, and the *step representation should be updated
    from Lisp. */
 void
-set_frame_menubar (struct frame *f, int first_time, int deep_p)
+set_frame_menubar (struct frame *f, bool first_time, bool deep_p)
 {
   ns_update_menubar (f, deep_p, nil);
 }
@@ -1012,10 +1012,10 @@ free_frame_tool_bar (FRAME_PTR f)
     Under NS we just hide the toolbar until it might be needed again.
    -------------------------------------------------------------------------- */
 {
-  BLOCK_INPUT;
+  block_input ();
   [[FRAME_NS_VIEW (f) toolbar] setVisible: NO];
   FRAME_TOOLBAR_HEIGHT (f) = 0;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 void
@@ -1029,7 +1029,7 @@ update_frame_tool_bar (FRAME_PTR f)
   NSWindow *window = [view window];
   EmacsToolbar *toolbar = [view toolbar];
 
-  BLOCK_INPUT;
+  block_input ();
   [toolbar clearActive];
 
   /* update EmacsToolbar as in GtkUtils, build items list */
@@ -1115,7 +1115,7 @@ update_frame_tool_bar (FRAME_PTR f)
   FRAME_TOOLBAR_HEIGHT (f) =
     NSHeight ([window frameRectForContentRect: NSMakeRect (0, 0, 0, 0)])
     - FRAME_NS_TITLEBAR_HEIGHT (f);
-  UNBLOCK_INPUT;
+    unblock_input ();
 }
 
 
@@ -1355,7 +1355,7 @@ pop_down_menu (Lisp_Object arg)
   struct Lisp_Save_Value *p = XSAVE_VALUE (arg);
   struct Popdown_data *unwind_data = (struct Popdown_data *) p->pointer;
 
-  BLOCK_INPUT;
+  block_input ();
   if (popup_activated_flag)
     {
       EmacsDialogPanel *panel = unwind_data->dialog;
@@ -1366,7 +1366,7 @@ pop_down_menu (Lisp_Object arg)
     }
 
   xfree (unwind_data);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -1434,7 +1434,7 @@ ns_popup_dialog (Lisp_Object position, Lisp_Object contents, Lisp_Object header)
        the dialog.  */
     contents = Fcons (title, Fcons (Fcons (build_string ("Ok"), Qt), Qnil));
 
-  BLOCK_INPUT;
+  block_input ();
   pool = [[NSAutoreleasePool alloc] init];
   dialog = [[EmacsDialogPanel alloc] initFromContents: contents
                                            isQuestion: isQ];
@@ -1452,7 +1452,7 @@ ns_popup_dialog (Lisp_Object position, Lisp_Object contents, Lisp_Object header)
     unbind_to (specpdl_count, Qnil);  /* calls pop_down_menu */
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return tem;
 }
@@ -1766,7 +1766,7 @@ ns_popup_dialog (Lisp_Object position, Lisp_Object contents, Lisp_Object header)
 }
 
 
- 
+
 - (void)timeout_handler: (NSTimer *)timedEntry
 {
   NSEvent *nxev = [NSEvent otherEventWithType: NSApplicationDefined
diff --git a/src/nsterm.h b/src/nsterm.h
index f3adab883a1..f06e0cb0f7f 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -38,6 +38,12 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifndef MAC_OS_X_VERSION_10_6
 #define MAC_OS_X_VERSION_10_6 1060
 #endif
+#ifndef MAC_OS_X_VERSION_10_7
+#define MAC_OS_X_VERSION_10_7 1070
+#endif
+#ifndef MAC_OS_X_VERSION_10_8
+#define MAC_OS_X_VERSION_10_8 1080
+#endif
 #endif /* NS_IMPL_COCOA */
 
 #ifdef __OBJC__
@@ -80,6 +86,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    BOOL windowClosing;
    NSString *workingText;
    BOOL processingCompose;
+   int fs_state, fs_before_fs, next_maximized, tbar_height, bwidth;
+   int maximized_width, maximized_height;
+   NSWindow *nonfs_window;
 @public
    struct frame *emacsframe;
    int rows, cols;
@@ -104,6 +113,9 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 - (EmacsToolbar *) toolbar;
 - (void) deleteWorkingText;
 - (void) updateFrameSize: (BOOL) delay;
+- (void) handleFS;
+- (void) setFSValue: (int)value;
+- (void) toggleFullScreen: (id) sender;
 
 #ifdef NS_IMPL_GNUSTEP
 /* Not declared, but useful. */
@@ -120,6 +132,12 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 @end
 
 
+/* Fullscreen version of the above.  */
+@interface EmacsFSWindow : EmacsWindow
+{
+}
+@end
+
 /* ==========================================================================
 
    The main menu implementation
@@ -749,11 +767,11 @@ extern Lisp_Object ns_cursor_type_to_lisp (int arg);
 extern void ns_set_name_as_filename (struct frame *f);
 extern void ns_set_doc_edited (struct frame *f, Lisp_Object arg);
 
-extern int
+extern bool
 ns_defined_color (struct frame *f,
                   const char *name,
-                  XColor *color_def, int alloc,
-                  char makeIndex);
+                  XColor *color_def, bool alloc,
+                  bool makeIndex);
 extern void
 ns_query_color (void *col, XColor *color_def, int setPixel);
 
@@ -799,8 +817,8 @@ struct image;
 extern void *ns_image_from_XBM (unsigned char *bits, int width, int height);
 extern void *ns_image_for_XPM (int width, int height, int depth);
 extern void *ns_image_from_file (Lisp_Object file);
-extern int ns_load_image (struct frame *f, struct image *img,
-                          Lisp_Object spec_file, Lisp_Object spec_data);
+extern bool ns_load_image (struct frame *f, struct image *img,
+                           Lisp_Object spec_file, Lisp_Object spec_data);
 extern int ns_image_width (void *img);
 extern int ns_image_height (void *img);
 extern unsigned long ns_get_pixel (void *img, int x, int y);
diff --git a/src/nsterm.m b/src/nsterm.m
index aa869e3ff44..d41c38f4e40 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -72,6 +72,11 @@ int term_trace_num = 0;
 #define NSTRACE(x)
 #endif
 
+#if defined (NS_IMPL_COCOA) && \
+  MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+#define NEW_STYLE_FS
+#endif
+
 extern NSString *NSMenuDidBeginTrackingNotification;
 
 /* ==========================================================================
@@ -581,7 +586,7 @@ ns_update_auto_hide_menu_bar (void)
 #endif
 #ifdef NS_IMPL_COCOA
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-  BLOCK_INPUT;
+  block_input ();
 
   NSTRACE (ns_update_auto_hide_menu_bar);
 
@@ -612,7 +617,7 @@ ns_update_auto_hide_menu_bar (void)
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif
 #endif
 }
@@ -662,7 +667,7 @@ ns_update_window_begin (struct window *w)
   updated_window = w;
   set_output_cursor (&w->cursor);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (f == hlinfo->mouse_face_mouse_frame)
     {
@@ -677,7 +682,7 @@ ns_update_window_begin (struct window *w)
       /* (further code for mouse faces ifdef'd out in other terms elided) */
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -694,7 +699,7 @@ ns_update_window_end (struct window *w, int cursor_on_p,
   /* note: this fn is nearly identical in all terms */
   if (!w->pseudo_window_p)
     {
-      BLOCK_INPUT;
+      block_input ();
 
       if (cursor_on_p)
         display_and_set_cursor (w, 1,
@@ -704,7 +709,7 @@ ns_update_window_end (struct window *w, int cursor_on_p,
       if (draw_window_fringes (w, 1))
         x_draw_vertical_border (w);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* If a row with mouse-face was overwritten, arrange for
@@ -733,7 +738,7 @@ ns_update_end (struct frame *f)
 /*   if (f == MOUSE_HL_INFO (f)->mouse_face_mouse_frame) */
     MOUSE_HL_INFO (f)->mouse_face_defer = 0;
 
-  BLOCK_INPUT;
+    block_input ();
 
 #ifdef NS_IMPL_GNUSTEP
   /* trigger flush only in the rectangle we tracked as being drawn */
@@ -745,7 +750,7 @@ ns_update_end (struct frame *f)
   [view unlockFocus];
   [[view window] flushWindow];
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   ns_updating_frame = NULL;
   NSTRACE (ns_update_end);
 }
@@ -902,7 +907,7 @@ ns_ring_bell (struct frame *f)
       struct frame *frame = SELECTED_FRAME ();
       NSView *view;
 
-      BLOCK_INPUT;
+      block_input ();
       pool = [[NSAutoreleasePool alloc] init];
 
       view = FRAME_NS_VIEW (frame);
@@ -929,7 +934,7 @@ ns_ring_bell (struct frame *f)
           ns_unfocus (frame);
         }
       [pool release];
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   else
     {
@@ -970,13 +975,13 @@ ns_raise_frame (struct frame *f)
 {
   NSView *view = FRAME_NS_VIEW (f);
   check_ns ();
-  BLOCK_INPUT;
+  block_input ();
   FRAME_SAMPLE_VISIBILITY (f);
   if (FRAME_VISIBLE_P (f))
     {
       [[view window] makeKeyAndOrderFront: NSApp];
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -988,9 +993,9 @@ ns_lower_frame (struct frame *f)
 {
   NSView *view = FRAME_NS_VIEW (f);
   check_ns ();
-  BLOCK_INPUT;
+  block_input ();
   [[view window] orderBack: NSApp];
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1126,7 +1131,7 @@ x_free_frame_resources (struct frame *f)
 
   [(EmacsView *)view setWindowClosing: YES]; /* may not have been informed */
 
-  BLOCK_INPUT;
+  block_input ();
 
   free_frame_menubar (f);
 
@@ -1154,7 +1159,7 @@ x_free_frame_resources (struct frame *f)
 
   xfree (f->output_data.ns);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 void
@@ -1183,7 +1188,7 @@ x_set_offset (struct frame *f, int xoff, int yoff, int change_grav)
 
   NSTRACE (x_set_offset);
 
-  BLOCK_INPUT;
+  block_input ();
 
   f->left_pos = xoff;
   f->top_pos = yoff;
@@ -1215,7 +1220,7 @@ x_set_offset (struct frame *f, int xoff, int yoff, int change_grav)
       f->size_hint_flags &= ~(XNegative|YNegative);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1240,7 +1245,7 @@ x_set_window_size (struct frame *f, int change_grav, int cols, int rows)
 
 /*fprintf (stderr, "\tsetWindowSize: %d x %d, font size %d x %d\n", cols, rows, FRAME_COLUMN_WIDTH (f), FRAME_LINE_HEIGHT (f)); */
 
-  BLOCK_INPUT;
+  block_input ();
 
   check_frame_size (f, &rows, &cols);
 
@@ -1302,10 +1307,21 @@ x_set_window_size (struct frame *f, int change_grav, int cols, int rows)
   mark_window_cursors_off (XWINDOW (f->root_window));
   cancel_mouse_face (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
+static void
+ns_fullscreen_hook (FRAME_PTR f)
+{
+  EmacsView *view = (EmacsView *)FRAME_NS_VIEW (f);
+  
+  if (! f->async_visible) return;
+
+  block_input ();
+  [view handleFS];
+  unblock_input ();
+}
 
 /* ==========================================================================
 
@@ -1414,7 +1430,7 @@ ns_get_color (const char *name, NSColor **col)
   NSString *nsname = [NSString stringWithUTF8String: name];
 
 /*fprintf (stderr, "ns_get_color: '%s'\n", name); */
-  BLOCK_INPUT;
+  block_input ();
 
   if ([nsname isEqualToString: @"ns_selection_color"])
     {
@@ -1461,7 +1477,7 @@ ns_get_color (const char *name, NSColor **col)
   if (r >= 0.0)
     {
       *col = [NSColor colorWithCalibratedRed: r green: g blue: b alpha: 1.0];
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
@@ -1493,7 +1509,7 @@ ns_get_color (const char *name, NSColor **col)
 
   if (new)
     *col = [new colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
-  UNBLOCK_INPUT;
+  unblock_input ();
   return new ? 0 : 1;
 }
 
@@ -1524,12 +1540,12 @@ ns_color_to_lisp (NSColor *col)
   const char *str;
   NSTRACE (ns_color_to_lisp);
 
-  BLOCK_INPUT;
+  block_input ();
   if ([[col colorSpaceName] isEqualToString: NSNamedColorSpace])
 
       if ((str =[[col colorNameComponent] UTF8String]))
         {
-          UNBLOCK_INPUT;
+          unblock_input ();
           return build_string ((char *)str);
         }
 
@@ -1541,14 +1557,14 @@ ns_color_to_lisp (NSColor *col)
             getWhite: &gray alpha: &alpha];
       snprintf (buf, sizeof (buf), "#%2.2lx%2.2lx%2.2lx",
                 lrint (gray * 0xff), lrint (gray * 0xff), lrint (gray * 0xff));
-      UNBLOCK_INPUT;
+      unblock_input ();
       return build_string (buf);
     }
 
   snprintf (buf, sizeof (buf), "#%2.2lx%2.2lx%2.2lx",
             lrint (red*0xff), lrint (green*0xff), lrint (blue*0xff));
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return build_string (buf);
 }
 
@@ -1575,33 +1591,33 @@ ns_query_color(void *col, XColor *color_def, int setPixel)
 }
 
 
-int
+bool
 ns_defined_color (struct frame *f,
                   const char *name,
                   XColor *color_def,
-                  int alloc,
-                  char makeIndex)
+                  bool alloc,
+                  bool makeIndex)
 /* --------------------------------------------------------------------------
-         Return 1 if named color found, and set color_def rgb accordingly.
+         Return true if named color found, and set color_def rgb accordingly.
          If makeIndex and alloc are nonzero put the color in the color_table,
          and set color_def pixel to the resulting index.
          If makeIndex is zero, set color_def pixel to ARGB.
-         Return 0 if not found
+         Return false if not found
    -------------------------------------------------------------------------- */
 {
   NSColor *col;
   NSTRACE (ns_defined_color);
 
-  BLOCK_INPUT;
+  block_input ();
   if (ns_get_color (name, &col) != 0) /* Color not found  */
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
   if (makeIndex && alloc)
     color_def->pixel = ns_index_color (col, f);
   ns_query_color (col, color_def, !makeIndex);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return 1;
 }
 
@@ -1767,7 +1783,7 @@ ns_mouse_position (struct frame **fp, int insist, Lisp_Object *bar_window,
 
   dpyinfo = FRAME_NS_DISPLAY_INFO (*fp);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (last_mouse_scroll_bar != nil && insist == 0)
     {
@@ -1812,7 +1828,7 @@ ns_mouse_position (struct frame **fp, int insist, Lisp_Object *bar_window,
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1832,7 +1848,7 @@ ns_frame_up_to_date (struct frame *f)
       if ((hlinfo->mouse_face_deferred_gc || f ==hlinfo->mouse_face_mouse_frame)
       /*&& hlinfo->mouse_face_mouse_frame*/)
         {
-          BLOCK_INPUT;
+          block_input ();
           ns_update_begin(f);
           if (hlinfo->mouse_face_mouse_frame)
             note_mouse_highlight (hlinfo->mouse_face_mouse_frame,
@@ -1840,7 +1856,7 @@ ns_frame_up_to_date (struct frame *f)
                                   hlinfo->mouse_face_mouse_y);
           hlinfo->mouse_face_deferred_gc = 0;
           ns_update_end(f);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
 }
@@ -1955,7 +1971,7 @@ ns_clear_frame (struct frame *f)
 
   r = [view bounds];
 
-  BLOCK_INPUT;
+  block_input ();
   ns_focus (f, &r, 1);
   [ns_lookup_indexed_color (NS_FACE_BACKGROUND (FRAME_DEFAULT_FACE (f)), f) set];
   NSRectFill (r);
@@ -1967,7 +1983,7 @@ ns_clear_frame (struct frame *f)
 
   /* as of 2006/11 or so this is now needed */
   ns_redraw_scroll_bars (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2068,7 +2084,7 @@ ns_scroll_run (struct window *w, struct run *run)
   if (height == 0)
       return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   updated_window = w;
   x_clear_cursor (w);
@@ -2083,7 +2099,7 @@ ns_scroll_run (struct window *w, struct run *run)
     ns_unfocus (f);
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2117,12 +2133,12 @@ ns_after_update_window_line (struct glyph_row *desired_row)
     {
       int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
 
-      BLOCK_INPUT;
+      block_input ();
       ns_clear_frame_area (f, 0, y, width, height);
       ns_clear_frame_area (f,
                            FRAME_PIXEL_WIDTH (f) - width,
                            y, width, height);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -2489,12 +2505,12 @@ show_hourglass (struct atimer *timer)
   if (hourglass_shown_p)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* TODO: add NSProgressIndicator to selected frame (see macfns.c) */
 
   hourglass_shown_p = 1;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2504,12 +2520,12 @@ hide_hourglass (void)
   if (!hourglass_shown_p)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* TODO: remove NSProgressIndicator from all frames */
 
   hourglass_shown_p = 0;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2979,7 +2995,8 @@ ns_dumpglyphs_image (struct glyph_string *s, NSRect r)
   if (img != nil)
     {
 #if !defined (NS_IMPL_COCOA) || MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-      [img drawInRect: br
+      NSRect dr = NSMakeRect (x, y, s->slice.width, s->slice.height);
+      [img drawInRect: dr
              fromRect: NSZeroRect
              operation: NSCompositeSourceOver
               fraction: 1.0
@@ -3351,17 +3368,7 @@ ns_read_socket (struct terminal *terminal, struct input_event *hold_quit)
   if ([NSApp modalWindow] != nil)
     return -1;
 
-  if (interrupt_input_blocked)
-    {
-      interrupt_input_pending = 1;
-      pending_signals = 1;
-      return -1;
-    }
-
-  interrupt_input_pending = 0;
-  pending_signals = pending_atimers;
-
-  BLOCK_INPUT;
+  block_input ();
   n_emacs_events_pending = 0;
   EVENT_INIT (ev);
   emacs_event = &ev;
@@ -3406,7 +3413,7 @@ ns_read_socket (struct terminal *terminal, struct input_event *hold_quit)
   nevents = n_emacs_events_pending;
   n_emacs_events_pending = 0;
   emacs_event = q_event_ptr = NULL;
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return nevents;
 }
@@ -3486,7 +3493,7 @@ ns_select (int nfds, fd_set *readfds, fd_set *writefds,
     }
 
   EVENT_INIT (event);
-  BLOCK_INPUT;
+  block_input ();
   emacs_event = &event;
   if (++apploopnr != 1)
     {
@@ -3500,7 +3507,7 @@ ns_select (int nfds, fd_set *readfds, fd_set *writefds,
       c = 's';
       write (selfds[1], &c, 1);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   ev = last_appdefined_event;
 
@@ -3612,7 +3619,7 @@ ns_set_vertical_scroll_bar (struct window *window,
                              || WINDOW_RIGHT_MARGIN_COLS (window) == 0));
 
   XSETWINDOW (win, window);
-  BLOCK_INPUT;
+  block_input ();
 
   /* we want at least 5 lines to display a scrollbar */
   if (WINDOW_TOTAL_LINES (window) < 5)
@@ -3624,7 +3631,7 @@ ns_set_vertical_scroll_bar (struct window *window,
           wset_vertical_scroll_bar (window, Qnil);
         }
       ns_clear_frame_area (f, sb_left, top, width, height);
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
@@ -3656,7 +3663,7 @@ ns_set_vertical_scroll_bar (struct window *window,
     }
 
   [bar setPosition: position portion: portion whole: whole];
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3900,11 +3907,11 @@ ns_delete_terminal (struct terminal *terminal)
   if (!terminal->name)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x_destroy_all_bitmaps (dpyinfo);
   ns_delete_display (dpyinfo);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3941,7 +3948,7 @@ ns_create_terminal (struct ns_display_info *dpyinfo)
   terminal->frame_rehighlight_hook = ns_frame_rehighlight;
   terminal->frame_raise_lower_hook = ns_frame_raise_lower;
 
-  terminal->fullscreen_hook = 0; /* see XTfullscreen_hook */
+  terminal->fullscreen_hook = ns_fullscreen_hook;
 
   terminal->set_vertical_scroll_bar_hook = ns_set_vertical_scroll_bar;
   terminal->condemn_scroll_bars_hook = ns_condemn_scroll_bars;
@@ -3982,7 +3989,7 @@ ns_term_init (Lisp_Object display_name)
 
   /* count object allocs (About, click icon); on OS X use ObjectAlloc tool */
   /*GSDebugAllocationActive (YES); */
-  BLOCK_INPUT;
+  block_input ();
 
   baud_rate = 38400;
   Fset_input_interrupt_mode (Qnil);
@@ -4051,7 +4058,7 @@ ns_term_init (Lisp_Object display_name)
 
   terminal->name = xstrdup (SSDATA (display_name));
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (!inhibit_x_resources)
     {
@@ -4696,6 +4703,8 @@ not_in_argv (NSString *arg)
 {
   NSTRACE (EmacsView_dealloc);
   [toolbar release];
+  if (fs_state == FULLSCREEN_BOTH)
+    [nonfs_window release];
   [super dealloc];
 }
 
@@ -5414,6 +5423,7 @@ not_in_argv (NSString *arg)
       SET_FRAME_GARBAGED (emacsframe);
       cancel_mouse_face (emacsframe);
       [view setFrame: NSMakeRect (0, 0, neww, newh)];
+      [self windowDidMove:nil];   // Update top/left.
     }
 }
 
@@ -5423,6 +5433,19 @@ not_in_argv (NSString *arg)
   NSTRACE (windowWillResize);
 /*fprintf (stderr,"Window will resize: %.0f x %.0f\n",frameSize.width,frameSize.height); */
 
+  if (fs_state == FULLSCREEN_MAXIMIZED
+      && (maximized_width != (int)frameSize.width
+          || maximized_height != (int)frameSize.height))
+    [self setFSValue: FULLSCREEN_NONE];
+  else if (fs_state == FULLSCREEN_WIDTH
+           && maximized_width != (int)frameSize.width)
+    [self setFSValue: FULLSCREEN_NONE];
+  else if (fs_state == FULLSCREEN_HEIGHT
+           && maximized_height != (int)frameSize.height)
+    [self setFSValue: FULLSCREEN_NONE];
+  if (fs_state == FULLSCREEN_NONE)
+    maximized_width = maximized_height = -1;
+
   cols = FRAME_PIXEL_WIDTH_TO_TEXT_COLS (emacsframe,
 #ifdef NS_IMPL_GNUSTEP
                                         frameSize.width + 3);
@@ -5604,6 +5627,10 @@ not_in_argv (NSString *arg)
   windowClosing = NO;
   processingCompose = NO;
   scrollbarsNeedingUpdate = 0;
+  fs_state = FULLSCREEN_NONE;
+  fs_before_fs = next_maximized = -1;
+  maximized_width = maximized_height = -1;
+  nonfs_window = nil;
 
 /*fprintf (stderr,"init with %d, %d\n",f->text_cols, f->text_lines); */
 
@@ -5628,9 +5655,13 @@ not_in_argv (NSString *arg)
                         backing: NSBackingStoreBuffered
                           defer: YES];
 
+#ifdef NEW_STYLE_FS
+    [win setCollectionBehavior:NSWindowCollectionBehaviorFullScreenPrimary];
+#endif
+
   wr = [win frame];
-  f->border_width = wr.size.width - r.size.width;
-  FRAME_NS_TITLEBAR_HEIGHT (f) = wr.size.height - r.size.height;
+  bwidth = f->border_width = wr.size.width - r.size.width;
+  tbar_height = FRAME_NS_TITLEBAR_HEIGHT (f) = wr.size.height - r.size.height;
 
   [win setAcceptsMouseMovedEvents: YES];
   [win setDelegate: self];
@@ -5736,27 +5767,50 @@ not_in_argv (NSString *arg)
 
   NSTRACE (windowWillUseStandardFrame);
 
-  if (abs (defaultFrame.size.height - result.size.height)
-      > FRAME_LINE_HEIGHT (emacsframe))
+  if (fs_before_fs != -1) /* Entering fullscreen */
+      {
+        result = defaultFrame;
+      }
+  else if (next_maximized == FULLSCREEN_HEIGHT
+      || (next_maximized == -1
+          && abs (defaultFrame.size.height - result.size.height)
+          > FRAME_LINE_HEIGHT (emacsframe)))
     {
       /* first click */
       ns_userRect = result;
-      result.size.height = defaultFrame.size.height;
+      maximized_height = result.size.height = defaultFrame.size.height;
+      maximized_width = -1;
       result.origin.y = defaultFrame.origin.y;
+      [self setFSValue: FULLSCREEN_HEIGHT];
+    }
+  else if (next_maximized == FULLSCREEN_WIDTH)
+    {
+      ns_userRect = result;
+      maximized_width = result.size.width = defaultFrame.size.width;
+      maximized_height = -1;
+      result.origin.x = defaultFrame.origin.x;
+      [self setFSValue: FULLSCREEN_WIDTH];
+    }
+  else if (next_maximized == FULLSCREEN_MAXIMIZED
+           || (next_maximized == -1
+               && abs (defaultFrame.size.width - result.size.width)
+               > FRAME_COLUMN_WIDTH (emacsframe)))
+    {
+      result = defaultFrame;  /* second click */
+      maximized_width = result.size.width;
+      maximized_height = result.size.height;
+      [self setFSValue: FULLSCREEN_MAXIMIZED];
     }
   else
     {
-      if (abs (defaultFrame.size.width - result.size.width)
-          > FRAME_COLUMN_WIDTH (emacsframe))
-        result = defaultFrame;  /* second click */
-      else
-        {
-          /* restore */
-          result = ns_userRect.size.height ? ns_userRect : result;
-          ns_userRect = NSMakeRect (0, 0, 0, 0);
-        }
+      /* restore */
+      result = ns_userRect.size.height ? ns_userRect : result;
+      ns_userRect = NSMakeRect (0, 0, 0, 0);
+      [self setFSValue: FULLSCREEN_NONE];
+      maximized_width = maximized_width = -1;
     }
 
+  if (fs_before_fs == -1) next_maximized = -1;
   [self windowWillResize: sender toSize: result.size];
   return result;
 }
@@ -5808,6 +5862,200 @@ not_in_argv (NSString *arg)
     }
 }
 
+- (void)windowWillEnterFullScreen:(NSNotification *)notification
+{
+  fs_before_fs = fs_state;
+}
+
+- (void)windowDidEnterFullScreen:(NSNotification *)notification
+{
+  [self setFSValue: FULLSCREEN_BOTH];
+#ifndef NEW_STYLE_FS
+  fprintf(stderr, "%s %d\n", __func__, FRAME_PIXEL_WIDTH (emacsframe));
+  [self windowDidBecomeKey:notification];
+#endif
+}
+
+- (void)windowWillExitFullScreen:(NSNotification *)notification
+{
+  if (next_maximized != -1)
+    fs_before_fs = next_maximized;
+}
+
+- (void)windowDidExitFullScreen:(NSNotification *)notification
+{
+  [self setFSValue: fs_before_fs];
+  fs_before_fs = -1;
+  if (next_maximized != -1)
+    [[self window] performZoom:self];
+}
+
+- (void)toggleFullScreen: (id)sender
+{
+  /* Bugs remain:
+     1) Having fullscreen in initial/default frame alist.
+     2) Fullscreen in default frame alist only applied to first frame.
+  */
+
+#ifdef NEW_STYLE_FS
+  [[self window] toggleFullScreen:sender];
+#else
+  NSWindow *w = [self window], *fw;
+  BOOL onFirstScreen = [[w screen]
+                         isEqual:[[NSScreen screens] objectAtIndex:0]];
+  struct frame *f = emacsframe;
+  NSSize sz;
+  NSRect r;
+  NSColor *col = ns_lookup_indexed_color (NS_FACE_BACKGROUND
+                                          (FRAME_DEFAULT_FACE (f)),
+                                          f);
+
+  sz.width = FRAME_COLUMN_WIDTH (f);
+  sz.height = FRAME_LINE_HEIGHT (f);
+
+  if (fs_state != FULLSCREEN_BOTH)
+    {
+      /* Hide dock and menubar if we are on the primary screen.  */
+      if (onFirstScreen)
+        {
+#if defined (NS_IMPL_COCOA) && \
+  MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+          NSApplicationPresentationOptions options
+            = NSApplicationPresentationAutoHideDock
+            | NSApplicationPresentationAutoHideMenuBar;
+
+          [NSApp setPresentationOptions: options];
+#else
+          [NSMenu setMenuBarVisible:NO];
+#endif
+        }
+
+      fw = [[EmacsFSWindow alloc]
+                       initWithContentRect:[w contentRectForFrameRect:[w frame]]
+                                 styleMask:NSBorderlessWindowMask
+                                   backing:NSBackingStoreBuffered
+                                     defer:YES
+                                    screen:[w screen]];
+
+      [fw setContentView:[w contentView]];
+      [fw setTitle:[w title]];
+      [fw makeKeyAndOrderFront:NSApp];
+      [fw setDelegate:self];
+      [fw makeFirstResponder:self];
+      [fw setAcceptsMouseMovedEvents: YES];
+      [fw useOptimizedDrawing: YES];
+      [fw setResizeIncrements: sz];
+      [fw setBackgroundColor: col];
+      if ([col alphaComponent] != 1.0)
+        [fw setOpaque: NO];
+
+      f->border_width = 0;
+      FRAME_NS_TITLEBAR_HEIGHT (f) = 0;
+
+      nonfs_window = w;
+      [self windowWillEnterFullScreen:nil];
+      [w orderOut:self];
+      r = [fw frameRectForContentRect:[[fw screen] frame]];
+      [fw setFrame: r display:YES animate:YES];
+      [self windowDidEnterFullScreen:nil];
+    }
+  else
+    {
+      fw = w;
+      w = nonfs_window;
+
+      if (onFirstScreen)
+        {
+#if defined (NS_IMPL_COCOA) && \
+  MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+          [NSApp setPresentationOptions: NSApplicationPresentationDefault];
+#else
+          [NSMenu setMenuBarVisible:YES];
+#endif
+        }
+
+      [w setContentView:[fw contentView]];
+      [w setResizeIncrements: sz];
+      [w setBackgroundColor: col];
+      if ([col alphaComponent] != 1.0)
+        [w setOpaque: NO];
+      
+      f->border_width = bwidth;
+      FRAME_NS_TITLEBAR_HEIGHT (f) = tbar_height;
+
+      [self windowWillExitFullScreen:nil];
+      [fw setFrame: [w frame] display:YES animate:YES];
+      [fw close];
+      [w makeKeyAndOrderFront:NSApp];
+      [self windowDidExitFullScreen:nil];
+    }
+#endif
+}
+
+- (void)handleFS
+{
+  if (fs_state != emacsframe->want_fullscreen)
+    {
+      if (fs_state == FULLSCREEN_BOTH)
+        {
+          [self toggleFullScreen:self];
+        }
+
+      switch (emacsframe->want_fullscreen)
+        {
+        case FULLSCREEN_BOTH:
+          [self toggleFullScreen:self];
+          break;
+        case FULLSCREEN_WIDTH:
+          next_maximized = FULLSCREEN_WIDTH;
+          if (fs_state != FULLSCREEN_BOTH)
+            [[self window] performZoom:self];
+          break;
+        case FULLSCREEN_HEIGHT:
+          next_maximized = FULLSCREEN_HEIGHT;
+          if (fs_state != FULLSCREEN_BOTH)
+            [[self window] performZoom:self];
+          break;
+        case FULLSCREEN_MAXIMIZED:
+          next_maximized = FULLSCREEN_MAXIMIZED;
+          if (fs_state != FULLSCREEN_BOTH)
+            [[self window] performZoom:self];
+          break;
+        case FULLSCREEN_NONE:
+          if (fs_state != FULLSCREEN_BOTH)
+            {
+              next_maximized = FULLSCREEN_NONE;
+              [[self window] performZoom:self];
+            }
+          break;
+        }
+  
+      emacsframe->want_fullscreen = FULLSCREEN_NONE;
+    }
+
+}
+
+- (void) setFSValue: (int)value
+{
+  Lisp_Object lval = Qnil;
+  switch (value)
+    {
+    case FULLSCREEN_BOTH:
+      lval = Qfullboth;
+      break;
+    case FULLSCREEN_WIDTH:
+      lval = Qfullwidth;
+      break;
+    case FULLSCREEN_HEIGHT:
+      lval = Qfullheight;
+      break;
+    case FULLSCREEN_MAXIMIZED:
+      lval = Qmaximized;
+      break;
+    }
+  store_frame_param (emacsframe, Qfullscreen, lval);
+  fs_state = value;
+}
 
 - (void)mouseEntered: (NSEvent *)theEvent
 {
@@ -6299,6 +6547,15 @@ not_in_argv (NSString *arg)
 @end /* EmacsWindow */
 
 
+@implementation EmacsFSWindow
+
+- (BOOL)canBecomeKeyWindow
+{
+  return YES;
+}
+
+@end
+
 /* ==========================================================================
 
     EmacsScroller implementation
@@ -6369,13 +6626,13 @@ not_in_argv (NSString *arg)
 - (void)setFrame: (NSRect)newRect
 {
   NSTRACE (EmacsScroller_setFrame);
-/*  BLOCK_INPUT; */
+/*  block_input (); */
   pixel_height = NSHeight (newRect);
   if (pixel_height == 0) pixel_height = 1;
   min_portion = 20 / pixel_height;
   [super setFrame: newRect];
   [self display];
-/*  UNBLOCK_INPUT; */
+/*  unblock_input (); */
 }
 
 
@@ -6410,14 +6667,14 @@ not_in_argv (NSString *arg)
   if (condemned)
     {
       EmacsView *view;
-      BLOCK_INPUT;
+      block_input ();
       /* ensure other scrollbar updates after deletion */
       view = (EmacsView *)FRAME_NS_VIEW (frame);
       if (view != nil)
         view->scrollbarsNeedingUpdate++;
       [self removeFromSuperview];
       [self release];
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   return self;
 }
diff --git a/src/print.c b/src/print.c
index aae13bb6764..49b491faec8 100644
--- a/src/print.c
+++ b/src/print.c
@@ -753,9 +753,9 @@ append to existing target file.  */)
 {
   if (initial_stderr_stream != NULL)
     {
-      BLOCK_INPUT;
+      block_input ();
       fclose (stderr);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   stderr = initial_stderr_stream;
   initial_stderr_stream = NULL;
diff --git a/src/process.c b/src/process.c
index c654369627d..ab215766c07 100644
--- a/src/process.c
+++ b/src/process.c
@@ -255,11 +255,12 @@ static int keyboard_bit_set (SELECT_TYPE *);
 static void deactivate_process (Lisp_Object);
 static void status_notify (struct Lisp_Process *);
 static int read_process_output (Lisp_Object, int);
+static void handle_child_signal (int);
 static void create_pty (Lisp_Object);
 
 /* If we support a window system, turn on the code to poll periodically
    to detect C-g.  It isn't actually used when doing interrupt input.  */
-#if defined (HAVE_WINDOW_SYSTEM) && !defined (USE_ASYNC_EVENTS)
+#ifdef HAVE_WINDOW_SYSTEM
 #define POLL_FOR_INPUT
 #endif
 
@@ -1610,11 +1611,16 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
   int wait_child_setup[2];
 #endif
 #ifdef SIGCHLD
-  sigset_t blocked, procmask;
+  sigset_t blocked;
 #endif
   /* Use volatile to protect variables from being clobbered by vfork.  */
   volatile int forkin, forkout;
   volatile int pty_flag = 0;
+  volatile Lisp_Object lisp_pty_name = Qnil;
+  volatile Lisp_Object encoded_current_dir;
+#if HAVE_WORKING_VFORK
+  char **volatile save_environ;
+#endif
 
   inchannel = outchannel = -1;
 
@@ -1640,6 +1646,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
       forkin = forkout = -1;
 #endif /* not USG, or USG_SUBTTY_WORKS */
       pty_flag = 1;
+      lisp_pty_name = build_string (pty_name);
     }
   else
 #endif /* HAVE_PTYS */
@@ -1704,14 +1711,6 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
   XPROCESS (process)->pty_flag = pty_flag;
   pset_status (XPROCESS (process), Qrun);
 
-#ifdef SIGCHLD
-  /* Delay interrupts until we have a chance to store
-     the new fork's pid in its process structure */
-  sigemptyset (&blocked);
-  sigaddset (&blocked, SIGCHLD);
-  pthread_sigmask (SIG_BLOCK, &blocked, &procmask);
-#endif
-
   FD_SET (inchannel, &input_wait_mask);
   FD_SET (inchannel, &non_keyboard_wait_mask);
   if (inchannel > max_process_desc)
@@ -1729,89 +1728,99 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
      error. */
   setup_process_coding_systems (process);
 
-  BLOCK_INPUT;
+  encoded_current_dir = ENCODE_FILE (current_dir);
 
-  {
-    /* child_setup must clobber environ on systems with true vfork.
-       Protect it from permanent change.  */
-    char **save_environ = environ;
-    volatile Lisp_Object encoded_current_dir = ENCODE_FILE (current_dir);
+  block_input ();
+
+#ifdef SIGCHLD
+  /* Block SIGCHLD until we have a chance to store the new fork's
+     pid in its process structure.  */
+  sigemptyset (&blocked);
+  sigaddset (&blocked, SIGCHLD);
+  pthread_sigmask (SIG_BLOCK, &blocked, 0);
+#endif
+
+#if HAVE_WORKING_VFORK
+  /* child_setup must clobber environ on systems with true vfork.
+     Protect it from permanent change.  */
+  save_environ = environ;
+#endif
 
 #ifndef WINDOWSNT
-    pid = vfork ();
-    if (pid == 0)
+  pid = vfork ();
+  if (pid == 0)
 #endif /* not WINDOWSNT */
-      {
-        int xforkin = forkin;
-        int xforkout = forkout;
+    {
+      int xforkin = forkin;
+      int xforkout = forkout;
 
-        /* Make the pty be the controlling terminal of the process.  */
+      /* Make the pty be the controlling terminal of the process.  */
 #ifdef HAVE_PTYS
-        /* First, disconnect its current controlling terminal.  */
+      /* First, disconnect its current controlling terminal.  */
 #ifdef HAVE_SETSID
-        /* We tried doing setsid only if pty_flag, but it caused
-           process_set_signal to fail on SGI when using a pipe.  */
-        setsid ();
-        /* Make the pty's terminal the controlling terminal.  */
-        if (pty_flag && xforkin >= 0)
-          {
+      /* We tried doing setsid only if pty_flag, but it caused
+         process_set_signal to fail on SGI when using a pipe.  */
+      setsid ();
+      /* Make the pty's terminal the controlling terminal.  */
+      if (pty_flag && xforkin >= 0)
+        {
 #ifdef TIOCSCTTY
-            /* We ignore the return value
-               because faith@cs.unc.edu says that is necessary on Linux.  */
-            ioctl (xforkin, TIOCSCTTY, 0);
+          /* We ignore the return value
+             because faith@cs.unc.edu says that is necessary on Linux.  */
+          ioctl (xforkin, TIOCSCTTY, 0);
 #endif
-          }
+        }
 #else /* not HAVE_SETSID */
 #ifdef USG
-        /* It's very important to call setpgrp here and no time
-           afterwards.  Otherwise, we lose our controlling tty which
-           is set when we open the pty. */
-        setpgrp ();
+      /* It's very important to call setpgrp here and no time
+         afterwards.  Otherwise, we lose our controlling tty which
+         is set when we open the pty. */
+      setpgrp ();
 #endif /* USG */
 #endif /* not HAVE_SETSID */
 #if defined (LDISC1)
-        if (pty_flag && xforkin >= 0)
-          {
-            struct termios t;
-            tcgetattr (xforkin, &t);
-            t.c_lflag = LDISC1;
-            if (tcsetattr (xforkin, TCSANOW, &t) < 0)
-              emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
-          }
+      if (pty_flag && xforkin >= 0)
+        {
+          struct termios t;
+          tcgetattr (xforkin, &t);
+          t.c_lflag = LDISC1;
+          if (tcsetattr (xforkin, TCSANOW, &t) < 0)
+            emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
+        }
 #else
 #if defined (NTTYDISC) && defined (TIOCSETD)
-        if (pty_flag && xforkin >= 0)
-          {
-            /* Use new line discipline.  */
-            int ldisc = NTTYDISC;
-            ioctl (xforkin, TIOCSETD, &ldisc);
-          }
+      if (pty_flag && xforkin >= 0)
+        {
+          /* Use new line discipline.  */
+          int ldisc = NTTYDISC;
+          ioctl (xforkin, TIOCSETD, &ldisc);
+        }
 #endif
 #endif
 #ifdef TIOCNOTTY
-        /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
-           can do TIOCSPGRP only to the process's controlling tty.  */
-        if (pty_flag)
-          {
-            /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
-               I can't test it since I don't have 4.3.  */
-            int j = emacs_open ("/dev/tty", O_RDWR, 0);
-            if (j >= 0)
-              {
-                ioctl (j, TIOCNOTTY, 0);
-                emacs_close (j);
-              }
+      /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you
+         can do TIOCSPGRP only to the process's controlling tty.  */
+      if (pty_flag)
+        {
+          /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here?
+             I can't test it since I don't have 4.3.  */
+          int j = emacs_open ("/dev/tty", O_RDWR, 0);
+          if (j >= 0)
+            {
+              ioctl (j, TIOCNOTTY, 0);
+              emacs_close (j);
+            }
 #ifndef USG
-            /* In order to get a controlling terminal on some versions
-               of BSD, it is necessary to put the process in pgrp 0
-               before it opens the terminal.  */
+          /* In order to get a controlling terminal on some versions
+             of BSD, it is necessary to put the process in pgrp 0
+             before it opens the terminal.  */
 #ifdef HAVE_SETPGID
-            setpgid (0, 0);
+          setpgid (0, 0);
 #else
-            setpgrp (0, 0);
+          setpgrp (0, 0);
 #endif
 #endif
-          }
+        }
 #endif /* TIOCNOTTY */
 
 #if !defined (DONT_REOPEN_PTY)
@@ -1823,70 +1832,79 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
      both HAVE_SETSID and TIOCSCTTY are defined.  */
         /* Now close the pty (if we had it open) and reopen it.
            This makes the pty the controlling terminal of the subprocess.  */
-        if (pty_flag)
-          {
+      if (pty_flag)
+        {
 
-            /* I wonder if emacs_close (emacs_open (pty_name, ...))
-               would work?  */
-            if (xforkin >= 0)
-              emacs_close (xforkin);
-            xforkout = xforkin = emacs_open (pty_name, O_RDWR, 0);
+          /* I wonder if emacs_close (emacs_open (pty_name, ...))
+             would work?  */
+          if (xforkin >= 0)
+            emacs_close (xforkin);
+          xforkout = xforkin = emacs_open (pty_name, O_RDWR, 0);
 
-            if (xforkin < 0)
-              {
-                emacs_write (1, "Couldn't open the pty terminal ", 31);
-                emacs_write (1, pty_name, strlen (pty_name));
-                emacs_write (1, "\n", 1);
-                _exit (1);
-              }
+          if (xforkin < 0)
+            {
+              emacs_write (1, "Couldn't open the pty terminal ", 31);
+              emacs_write (1, pty_name, strlen (pty_name));
+              emacs_write (1, "\n", 1);
+              _exit (1);
+            }
 
-          }
+        }
 #endif /* not DONT_REOPEN_PTY */
 
 #ifdef SETUP_SLAVE_PTY
-        if (pty_flag)
-          {
-            SETUP_SLAVE_PTY;
-          }
+      if (pty_flag)
+        {
+          SETUP_SLAVE_PTY;
+        }
 #endif /* SETUP_SLAVE_PTY */
 #ifdef AIX
-        /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
-           Now reenable it in the child, so it will die when we want it to.  */
-        if (pty_flag)
-          signal (SIGHUP, SIG_DFL);
+      /* On AIX, we've disabled SIGHUP above once we start a child on a pty.
+         Now reenable it in the child, so it will die when we want it to.  */
+      if (pty_flag)
+        signal (SIGHUP, SIG_DFL);
 #endif
 #endif /* HAVE_PTYS */
 
-        signal (SIGINT, SIG_DFL);
-        signal (SIGQUIT, SIG_DFL);
-        /* GConf causes us to ignore SIGPIPE, make sure it is restored
-           in the child.  */
-        signal (SIGPIPE, SIG_DFL);
+      signal (SIGINT, SIG_DFL);
+      signal (SIGQUIT, SIG_DFL);
+
+      /* Emacs ignores SIGPIPE, but the child should not.  */
+      signal (SIGPIPE, SIG_DFL);
 
 #ifdef SIGCHLD
         /* Stop blocking signals in the child.  */
-        pthread_sigmask (SIG_SETMASK, &procmask, 0);
+      pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
 #endif
 
-        if (pty_flag)
-          child_setup_tty (xforkout);
+      if (pty_flag)
+        child_setup_tty (xforkout);
 #ifdef WINDOWSNT
-        pid = child_setup (xforkin, xforkout, xforkout,
-                           new_argv, 1, encoded_current_dir);
+      pid = child_setup (xforkin, xforkout, xforkout,
+                         new_argv, 1, encoded_current_dir);
 #else  /* not WINDOWSNT */
 #ifdef FD_CLOEXEC
-        emacs_close (wait_child_setup[0]);
+      emacs_close (wait_child_setup[0]);
 #endif
-        child_setup (xforkin, xforkout, xforkout,
-                     new_argv, 1, encoded_current_dir);
+      child_setup (xforkin, xforkout, xforkout,
+                   new_argv, 1, encoded_current_dir);
 #endif /* not WINDOWSNT */
-      }
-    environ = save_environ;
-  }
+    }
+
+  /* Back in the parent process.  */
+
+#if HAVE_WORKING_VFORK
+  environ = save_environ;
+#endif
+
+  XPROCESS (process)->pid = pid;
 
-  UNBLOCK_INPUT;
+  /* Stop blocking signals in the parent.  */
+#ifdef SIGCHLD
+  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
+#endif
+  unblock_input ();
 
-  /* This runs in the Emacs process.  */
   if (pid < 0)
     {
       if (forkin >= 0)
@@ -1897,7 +1915,6 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
   else
     {
       /* vfork succeeded.  */
-      XPROCESS (process)->pid = pid;
 
 #ifdef WINDOWSNT
       register_child (pid, inchannel);
@@ -1923,12 +1940,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
       if (forkin != forkout && forkout >= 0)
         emacs_close (forkout);
 
-#ifdef HAVE_PTYS
-      if (pty_flag)
-        pset_tty_name (XPROCESS (process), build_string (pty_name));
-      else
-#endif
-        pset_tty_name (XPROCESS (process), Qnil);
+      pset_tty_name (XPROCESS (process), lisp_pty_name);
 
 #if !defined (WINDOWSNT) && defined (FD_CLOEXEC)
       /* Wait for child_setup to complete in case that vfork is
@@ -1945,11 +1957,6 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
 #endif
     }
 
-#ifdef SIGCHLD
-  /* Stop blocking signals in the parent.  */
-  pthread_sigmask (SIG_SETMASK, &procmask, 0);
-#endif
-
   /* Now generate the error if vfork failed.  */
   if (pid < 0)
     report_file_error ("Doing vfork", Qnil);
@@ -3402,9 +3409,9 @@ usage: (make-network-process &rest ARGS)  */)
 #ifdef HAVE_GETADDRINFO
   if (res != &ai)
     {
-      BLOCK_INPUT;
+      block_input ();
       freeaddrinfo (res);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif
 
@@ -4372,7 +4379,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
          Otherwise, do pending quit if requested.  */
       if (read_kbd >= 0)
         QUIT;
-      else
+      else if (pending_signals)
         process_pending_signals ();
 
       /* Exit now if the cell we're waiting for became non-nil.  */
@@ -4739,21 +4746,6 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
           check_write = 0;
         }
 
-#if 0 /* When polling is used, interrupt_input is 0,
-         so get_input_pending should read the input.
-         So this should not be needed.  */
-      /* If we are using polling for input,
-         and we see input available, make it get read now.
-         Otherwise it might not actually get read for a second.
-         And on hpux, since we turn off polling in wait_reading_process_output,
-         it might never get read at all if we don't spend much time
-         outside of wait_reading_process_output.  */
-      if (read_kbd && interrupt_input
-          && keyboard_bit_set (&Available)
-          && input_polling_used ())
-        kill (getpid (), SIGALRM);
-#endif
-
       /* Check for keyboard input */
       /* If there is any, return immediately
          to give it higher priority than subprocesses */
@@ -4817,7 +4809,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
 
       if (read_kbd && interrupt_input
           && keyboard_bit_set (&Available) && ! noninteractive)
-        kill (getpid (), SIGIO);
+        handle_input_available_signal (SIGIO);
 #endif
 
       if (! wait_proc)
@@ -4937,7 +4929,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
                       pset_status (p, Qfailed);
                     }
                   else
-                    kill (getpid (), SIGCHLD);
+                    handle_child_signal (SIGCHLD);
                 }
 #endif /* HAVE_PTYS */
               /* If we can detect process termination, don't consider the
@@ -5393,25 +5385,6 @@ read_process_output (Lisp_Object proc, register int channel)
 
 /* Sending data to subprocess */
 
-static sys_jmp_buf send_process_frame;
-static Lisp_Object process_sent_to;
-
-static _Noreturn void
-handle_pipe_signal (int sig)
-{
-  sigset_t unblocked;
-  sigemptyset (&unblocked);
-  sigaddset (&unblocked, SIGPIPE);
-  pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
-  sys_longjmp (send_process_frame, 1);
-}
-
-static void
-deliver_pipe_signal (int sig)
-{
-  handle_on_main_thread (sig, handle_pipe_signal);
-}
-
 /* In send_process, when a write fails temporarily,
    wait_reading_process_output is called.  It may execute user code,
    e.g. timers, that attempts to write new data to the same process.
@@ -5495,14 +5468,12 @@ write_queue_pop (struct Lisp_Process *p, Lisp_Object *obj,
    This function can evaluate Lisp code and can garbage collect.  */
 
 static void
-send_process (volatile Lisp_Object proc, const char *volatile buf,
-              volatile ptrdiff_t len, volatile Lisp_Object object)
+send_process (Lisp_Object proc, const char *buf, ptrdiff_t len,
+              Lisp_Object object)
 {
-  /* Use volatile to protect variables from being clobbered by longjmp.  */
   struct Lisp_Process *p = XPROCESS (proc);
   ssize_t rv;
   struct coding_system *coding;
-  struct sigaction old_sigpipe_action;
 
   if (p->raw_status_new)
     update_status (p);
@@ -5609,145 +5580,126 @@ send_process (volatile Lisp_Object proc, const char *volatile buf,
       pty_max_bytes--;
     }
 
-  /* 2000-09-21: Emacs 20.7, sparc-sun-solaris-2.6, GCC 2.95.2,
-     CFLAGS="-g -O": The value of the parameter `proc' is clobbered
-     when returning with longjmp despite being declared volatile.  */
-  if (!sys_setjmp (send_process_frame))
-    {
-      p = XPROCESS (proc);  /* Repair any setjmp clobbering.  */
-      process_sent_to = proc;
+  /* If there is already data in the write_queue, put the new data
+     in the back of queue.  Otherwise, ignore it.  */
+  if (!NILP (p->write_queue))
+    write_queue_push (p, object, buf, len, 0);
 
-      /* If there is already data in the write_queue, put the new data
-         in the back of queue.  Otherwise, ignore it.  */
-      if (!NILP (p->write_queue))
-        write_queue_push (p, object, buf, len, 0);
+  do   /* while !NILP (p->write_queue) */
+    {
+      ptrdiff_t cur_len = -1;
+      const char *cur_buf;
+      Lisp_Object cur_object;
 
-      do   /* while !NILP (p->write_queue) */
+      /* If write_queue is empty, ignore it.  */
+      if (!write_queue_pop (p, &cur_object, &cur_buf, &cur_len))
         {
-          ptrdiff_t cur_len = -1;
-          const char *cur_buf;
-          Lisp_Object cur_object;
+          cur_len = len;
+          cur_buf = buf;
+          cur_object = object;
+        }
 
-          /* If write_queue is empty, ignore it.  */
-          if (!write_queue_pop (p, &cur_object, &cur_buf, &cur_len))
+      while (cur_len > 0)
+        {
+          /* Send this batch, using one or more write calls.  */
+          ptrdiff_t written = 0;
+          int outfd = p->outfd;
+#ifdef DATAGRAM_SOCKETS
+          if (DATAGRAM_CHAN_P (outfd))
             {
-              cur_len = len;
-              cur_buf = buf;
-              cur_object = object;
+              rv = sendto (outfd, cur_buf, cur_len,
+                           0, datagram_address[outfd].sa,
+                           datagram_address[outfd].len);
+              if (0 <= rv)
+                written = rv;
+              else if (errno == EMSGSIZE)
+                report_file_error ("sending datagram", Fcons (proc, Qnil));
             }
-
-          while (cur_len > 0)
-            {
-              /* Send this batch, using one or more write calls.  */
-              ptrdiff_t written = 0;
-              int outfd = p->outfd;
-              struct sigaction action;
-              emacs_sigaction_init (&action, deliver_pipe_signal);
-              sigaction (SIGPIPE, &action, &old_sigpipe_action);
-#ifdef DATAGRAM_SOCKETS
-              if (DATAGRAM_CHAN_P (outfd))
-                {
-                  rv = sendto (outfd, cur_buf, cur_len,
-                               0, datagram_address[outfd].sa,
-                               datagram_address[outfd].len);
-                  if (0 <= rv)
-                    written = rv;
-                  else if (errno == EMSGSIZE)
-                    {
-                      sigaction (SIGPIPE, &old_sigpipe_action, 0);
-                      report_file_error ("sending datagram",
-                                         Fcons (proc, Qnil));
-                    }
-                }
-              else
+          else
 #endif
-                {
+            {
 #ifdef HAVE_GNUTLS
-                  if (p->gnutls_p)
-                    written = emacs_gnutls_write (p, cur_buf, cur_len);
-                  else
+              if (p->gnutls_p)
+                written = emacs_gnutls_write (p, cur_buf, cur_len);
+              else
 #endif
-                    written = emacs_write (outfd, cur_buf, cur_len);
-                  rv = (written ? 0 : -1);
+                written = emacs_write (outfd, cur_buf, cur_len);
+              rv = (written ? 0 : -1);
 #ifdef ADAPTIVE_READ_BUFFERING
-                  if (p->read_output_delay > 0
-                      && p->adaptive_read_buffering == 1)
-                    {
-                      p->read_output_delay = 0;
-                      process_output_delay_count--;
-                      p->read_output_skip = 0;
-                    }
-#endif
+              if (p->read_output_delay > 0
+                  && p->adaptive_read_buffering == 1)
+                {
+                  p->read_output_delay = 0;
+                  process_output_delay_count--;
+                  p->read_output_skip = 0;
                 }
-              sigaction (SIGPIPE, &old_sigpipe_action, 0);
+#endif
+            }
 
-              if (rv < 0)
-                {
-                  if (0
+          if (rv < 0)
+            {
+              if (0
 #ifdef EWOULDBLOCK
-                      || errno == EWOULDBLOCK
+                  || errno == EWOULDBLOCK
 #endif
 #ifdef EAGAIN
-                      || errno == EAGAIN
+                  || errno == EAGAIN
 #endif
-                      )
-                    /* Buffer is full.  Wait, accepting input;
-                       that may allow the program
-                       to finish doing output and read more.  */
-                    {
+                  )
+                /* Buffer is full.  Wait, accepting input;
+                   that may allow the program
+                   to finish doing output and read more.  */
+                {
 #ifdef BROKEN_PTY_READ_AFTER_EAGAIN
-                      /* A gross hack to work around a bug in FreeBSD.
-                         In the following sequence, read(2) returns
-                         bogus data:
-
-                         write(2)        1022 bytes
-                         write(2)   954 bytes, get EAGAIN
-                         read(2)   1024 bytes in process_read_output
-                         read(2)     11 bytes in process_read_output
-
-                         That is, read(2) returns more bytes than have
-                         ever been written successfully.  The 1033 bytes
-                         read are the 1022 bytes written successfully
-                         after processing (for example with CRs added if
-                         the terminal is set up that way which it is
-                         here).  The same bytes will be seen again in a
-                         later read(2), without the CRs.  */
-
-                      if (errno == EAGAIN)
-                        {
-                          int flags = FWRITE;
-                          ioctl (p->outfd, TIOCFLUSH, &flags);
-                        }
+                  /* A gross hack to work around a bug in FreeBSD.
+                     In the following sequence, read(2) returns
+                     bogus data:
+
+                     write(2)    1022 bytes
+                     write(2)   954 bytes, get EAGAIN
+                     read(2)   1024 bytes in process_read_output
+                     read(2)     11 bytes in process_read_output
+
+                     That is, read(2) returns more bytes than have
+                     ever been written successfully.  The 1033 bytes
+                     read are the 1022 bytes written successfully
+                     after processing (for example with CRs added if
+                     the terminal is set up that way which it is
+                     here).  The same bytes will be seen again in a
+                     later read(2), without the CRs.  */
+
+                  if (errno == EAGAIN)
+                    {
+                      int flags = FWRITE;
+                      ioctl (p->outfd, TIOCFLUSH, &flags);
+                    }
 #endif /* BROKEN_PTY_READ_AFTER_EAGAIN */
 
-                      /* Put what we should have written in wait_queue.  */
-                      write_queue_push (p, cur_object, cur_buf, cur_len, 1);
-                      wait_reading_process_output (0, 20 * 1000 * 1000,
-                                                   0, 0, Qnil, NULL, 0);
-                      /* Reread queue, to see what is left.  */
-                      break;
-                    }
-                  else
-                    /* This is a real error.  */
-                    report_file_error ("writing to process", Fcons (proc, Qnil));
+                  /* Put what we should have written in wait_queue.  */
+                  write_queue_push (p, cur_object, cur_buf, cur_len, 1);
+                  wait_reading_process_output (0, 20 * 1000 * 1000,
+                                               0, 0, Qnil, NULL, 0);
+                  /* Reread queue, to see what is left.  */
+                  break;
                 }
-              cur_buf += written;
-              cur_len -= written;
+              else if (errno == EPIPE)
+                {
+                  p->raw_status_new = 0;
+                  pset_status (p, list2 (Qexit, make_number (256)));
+                  p->tick = ++process_tick;
+                  deactivate_process (proc);
+                  error ("process %s no longer connected to pipe; closed it",
+                         SDATA (p->name));
+                }
+              else
+                /* This is a real error.  */
+                report_file_error ("writing to process", Fcons (proc, Qnil));
             }
+          cur_buf += written;
+          cur_len -= written;
         }
-      while (!NILP (p->write_queue));
-    }
-  else
-    {
-      sigaction (SIGPIPE, &old_sigpipe_action, 0);
-      proc = process_sent_to;
-      p = XPROCESS (proc);
-      p->raw_status_new = 0;
-      pset_status (p, Fcons (Qexit, Fcons (make_number (256), Qnil)));
-      p->tick = ++process_tick;
-      deactivate_process (proc);
-      error ("SIGPIPE raised on process %s; closed it", SDATA (p->name));
     }
+  while (!NILP (p->write_queue));
 }
 
 DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region,
@@ -6178,39 +6130,27 @@ SIGCODE may be an integer, or a symbol whose name is a signal name.  */)
 #ifdef SIGUSR2
       parse_signal ("usr2", SIGUSR2);
 #endif
-#ifdef SIGTERM
       parse_signal ("term", SIGTERM);
-#endif
 #ifdef SIGHUP
       parse_signal ("hup", SIGHUP);
 #endif
-#ifdef SIGINT
       parse_signal ("int", SIGINT);
-#endif
 #ifdef SIGQUIT
       parse_signal ("quit", SIGQUIT);
 #endif
-#ifdef SIGILL
       parse_signal ("ill", SIGILL);
-#endif
-#ifdef SIGABRT
       parse_signal ("abrt", SIGABRT);
-#endif
 #ifdef SIGEMT
       parse_signal ("emt", SIGEMT);
 #endif
 #ifdef SIGKILL
       parse_signal ("kill", SIGKILL);
 #endif
-#ifdef SIGFPE
       parse_signal ("fpe", SIGFPE);
-#endif
 #ifdef SIGBUS
       parse_signal ("bus", SIGBUS);
 #endif
-#ifdef SIGSEGV
       parse_signal ("segv", SIGSEGV);
-#endif
 #ifdef SIGSYS
       parse_signal ("sys", SIGSYS);
 #endif
@@ -6375,27 +6315,15 @@ process has been transmitted to the serial port.  */)
    ** Malloc WARNING: This should never call malloc either directly or
    indirectly; if it does, that is a bug  */
 
-#ifdef SIGCHLD
-
-/* Record one child's changed status.  Return true if a child was found.  */
-static bool
-record_child_status_change (void)
+/* Record the changed status of the child process PID with wait status W.  */
+void
+record_child_status_change (pid_t pid, int w)
 {
+#ifdef SIGCHLD
   Lisp_Object proc;
   struct Lisp_Process *p;
-  pid_t pid;
-  int w;
   Lisp_Object tail;
 
-  do
-    pid = waitpid (-1, &w, WNOHANG | WUNTRACED);
-  while (pid < 0 && errno == EINTR);
-
-  /* PID == 0 means no processes found, PID == -1 means a real failure.
-     Either way, we have done all our job.  */
-  if (pid <= 0)
-    return false;
-
   /* Find the process that signaled us, and record its status.  */
 
   /* The process can have been deleted by Fdelete_process.  */
@@ -6406,7 +6334,7 @@ record_child_status_change (void)
           || (FLOATP (xpid) && pid == XFLOAT_DATA (xpid)))
         {
           XSETCAR (tail, Qnil);
-          return true;
+          return;
         }
     }
 
@@ -6476,10 +6404,11 @@ record_child_status_change (void)
       if (input_available_clear_time)
         *input_available_clear_time = make_emacs_time (0, 0);
     }
-
-  return true;
+#endif
 }
 
+#ifdef SIGCHLD
+
 /* On some systems, the SIGCHLD handler must return right away.  If
    any more processes want to signal us, we will get another signal.
    Otherwise, loop around to use up all the processes that have
@@ -6495,14 +6424,29 @@ enum { CAN_HANDLE_MULTIPLE_CHILDREN = 1 };
 static void
 handle_child_signal (int sig)
 {
-  while (record_child_status_change () && CAN_HANDLE_MULTIPLE_CHILDREN)
-    continue;
+  do
+    {
+      pid_t pid;
+      int status;
+
+      do
+        pid = waitpid (-1, &status, WNOHANG | WUNTRACED);
+      while (pid < 0 && errno == EINTR);
+
+      /* PID == 0 means no processes found, PID == -1 means a real failure.
+         Either way, we have done all our job.  */
+      if (pid <= 0)
+        break;
+
+      record_child_status_change (pid, status);
+    }
+  while (CAN_HANDLE_MULTIPLE_CHILDREN);
 }
 
 static void
 deliver_child_signal (int sig)
 {
-  handle_on_main_thread (sig, handle_child_signal);
+  deliver_process_signal (sig, handle_child_signal);
 }
 
 #endif /* SIGCHLD */
diff --git a/src/profiler.c b/src/profiler.c
new file mode 100644
index 00000000000..90a85c5230e
--- /dev/null
+++ b/src/profiler.c
@@ -0,0 +1,518 @@
+/* Profiler implementation.
+
+Copyright (C) 2012 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+#include "lisp.h"
+#include "syssignal.h"
+#include "systime.h"
+
+/* Return A + B, but return the maximum fixnum if the result would overflow.
+   Assume A and B are nonnegative and in fixnum range.  */
+
+static EMACS_INT
+saturated_add (EMACS_INT a, EMACS_INT b)
+{
+  return min (a + b, MOST_POSITIVE_FIXNUM);
+}
+
+/* Logs.  */
+
+typedef struct Lisp_Hash_Table log_t;
+
+static Lisp_Object
+make_log (int heap_size, int max_stack_depth)
+{
+  /* We use a standard Elisp hash-table object, but we use it in
+     a special way.  This is OK as long as the object is not exposed
+     to Elisp, i.e. until it is returned by *-profiler-log, after which
+     it can't be used any more.  */
+  Lisp_Object log = make_hash_table (Qequal, make_number (heap_size),
+                                     make_float (DEFAULT_REHASH_SIZE),
+                                     make_float (DEFAULT_REHASH_THRESHOLD),
+                                     Qnil, Qnil, Qnil);
+  struct Lisp_Hash_Table *h = XHASH_TABLE (log);
+
+  /* What is special about our hash-tables is that the keys are pre-filled
+     with the vectors we'll put in them.  */
+  int i = ASIZE (h->key_and_value) / 2;
+  while (0 < i)
+    set_hash_key_slot (h, --i,
+                       Fmake_vector (make_number (max_stack_depth), Qnil));
+  return log;
+}
+
+/* Evict the least used half of the hash_table.
+
+   When the table is full, we have to evict someone.
+   The easiest and most efficient is to evict the value we're about to add
+   (i.e. once the table is full, stop sampling).
+
+   We could also pick the element with the lowest count and evict it,
+   but finding it is O(N) and for that amount of work we get very
+   little in return: for the next sample, this latest sample will have
+   count==1 and will hence be a prime candidate for eviction :-(
+
+   So instead, we take O(N) time to eliminate more or less half of the
+   entries (the half with the lowest counts).  So we get an amortized
+   cost of O(1) and we get O(N) time for a new entry to grow larger
+   than the other least counts before a new round of eviction.  */
+
+static EMACS_INT approximate_median (log_t *log,
+                                     ptrdiff_t start, ptrdiff_t size)
+{
+  eassert (size > 0);
+  if (size < 2)
+    return XINT (HASH_VALUE (log, start));
+  if (size < 3)
+    /* Not an actual median, but better for our application than
+       choosing either of the two numbers.  */
+    return ((XINT (HASH_VALUE (log, start))
+             + XINT (HASH_VALUE (log, start + 1)))
+            / 2);
+  else
+    {
+      ptrdiff_t newsize = size / 3;
+      ptrdiff_t start2 = start + newsize;
+      EMACS_INT i1 = approximate_median (log, start, newsize);
+      EMACS_INT i2 = approximate_median (log, start2, newsize);
+      EMACS_INT i3 = approximate_median (log, start2 + newsize,
+                                         size - 2 * newsize);
+      return (i1 < i2
+              ? (i2 < i3 ? i2 : (i1 < i3 ? i3 : i1))
+              : (i1 < i3 ? i1 : (i2 < i3 ? i3 : i2)));
+    }
+}
+
+static void evict_lower_half (log_t *log)
+{
+  ptrdiff_t size = ASIZE (log->key_and_value) / 2;
+  EMACS_INT median = approximate_median (log, 0, size);
+  ptrdiff_t i;
+
+  for (i = 0; i < size; i++)
+    /* Evict not only values smaller but also values equal to the median,
+       so as to make sure we evict something no matter what.  */
+    if (XINT (HASH_VALUE (log, i)) <= median)
+      {
+        Lisp_Object key = HASH_KEY (log, i);
+        { /* FIXME: we could make this more efficient.  */
+          Lisp_Object tmp;
+          XSET_HASH_TABLE (tmp, log); /* FIXME: Use make_lisp_ptr.  */
+          Fremhash (key, tmp);
+        }
+        eassert (EQ (log->next_free, make_number (i)));
+        {
+          int j;
+          eassert (VECTORP (key));
+          for (j = 0; j < ASIZE (key); j++)
+            ASET (key, j, Qnil);
+        }
+        set_hash_key_slot (log, i, key);
+      }
+}
+
+/* Record the current backtrace in LOG.  COUNT is the weight of this
+   current backtrace: milliseconds for CPU counts, and the allocation
+   size for memory logs.  */
+
+static void
+record_backtrace (log_t *log, EMACS_INT count)
+{
+  struct backtrace *backlist = backtrace_list;
+  Lisp_Object backtrace;
+  ptrdiff_t index, i = 0;
+  ptrdiff_t asize;
+
+  if (!INTEGERP (log->next_free))
+    /* FIXME: transfer the evicted counts to a special entry rather
+       than dropping them on the floor.  */
+    evict_lower_half (log);
+  index = XINT (log->next_free);
+
+  /* Get a "working memory" vector.  */
+  backtrace = HASH_KEY (log, index);
+  asize = ASIZE (backtrace);
+
+  /* Copy the backtrace contents into working memory.  */
+  for (; i < asize && backlist; i++, backlist = backlist->next)
+    /* FIXME: For closures we should ignore the environment.  */
+    ASET (backtrace, i, backlist->function);
+
+  /* Make sure that unused space of working memory is filled with nil.  */
+  for (; i < asize; i++)
+    ASET (backtrace, i, Qnil);
+
+  { /* We basically do a `gethash+puthash' here, except that we have to be
+       careful to avoid memory allocation since we're in a signal
+       handler, and we optimize the code to try and avoid computing the
+       hash+lookup twice.  See fns.c:Fputhash for reference.  */
+    EMACS_UINT hash;
+    ptrdiff_t j = hash_lookup (log, backtrace, &hash);
+    if (j >= 0)
+      {
+        EMACS_INT old_val = XINT (HASH_VALUE (log, j));
+        EMACS_INT new_val = saturated_add (old_val, count);
+        set_hash_value_slot (log, j, make_number (new_val));
+      }
+    else
+      { /* BEWARE!  hash_put in general can allocate memory.
+           But currently it only does that if log->next_free is nil.  */
+        int j;
+        eassert (!NILP (log->next_free));
+        j = hash_put (log, backtrace, make_number (count), hash);
+        /* Let's make sure we've put `backtrace' right where it
+           already was to start with.  */
+        eassert (index == j);
+
+        /* FIXME: If the hash-table is almost full, we should set
+           some global flag so that some Elisp code can offload its
+           data elsewhere, so as to avoid the eviction code.
+           There are 2 ways to do that, AFAICT:
+           - Set a flag checked in QUIT, such that QUIT can then call
+             Fprofiler_cpu_log and stash the full log for later use.
+           - Set a flag check in post-gc-hook, so that Elisp code can call
+             profiler-cpu-log.  That gives us more flexibility since that
+             Elisp code can then do all kinds of fun stuff like write
+             the log to disk.  Or turn it right away into a call tree.
+           Of course, using Elisp is generally preferable, but it may
+           take longer until we get a chance to run the Elisp code, so
+           there's more risk that the table will get full before we
+           get there.  */
+      }
+  }
+}
+
+/* Sample profiler.  */
+
+/* FIXME: Add support for the CPU profiler in W32.  */
+
+#ifdef PROFILER_CPU_SUPPORT
+
+/* The profiler timer and whether it was properly initialized, if
+   POSIX timers are available.  */
+#ifdef HAVE_TIMER_SETTIME
+static timer_t profiler_timer;
+static bool profiler_timer_ok;
+#endif
+
+/* Status of sampling profiler.  */
+static enum profiler_cpu_running
+  { NOT_RUNNING, TIMER_SETTIME_RUNNING, SETITIMER_RUNNING }
+  profiler_cpu_running;
+
+/* Hash-table log of CPU profiler.  */
+static Lisp_Object cpu_log;
+
+/* Separate counter for the time spent in the GC.  */
+static EMACS_INT cpu_gc_count;
+
+/* The current sample interval in milliseconds.  */
+static EMACS_INT current_sample_interval;
+
+/* Signal handler for sample profiler.  */
+
+static void
+handle_profiler_signal (int signal)
+{
+  if (backtrace_list && EQ (backtrace_list->function, Qautomatic_gc))
+    /* Special case the time-count inside GC because the hash-table
+       code is not prepared to be used while the GC is running.
+       More specifically it uses ASIZE at many places where it does
+       not expect the ARRAY_MARK_FLAG to be set.  We could try and
+       harden the hash-table code, but it doesn't seem worth the
+       effort.  */
+    cpu_gc_count = saturated_add (cpu_gc_count, current_sample_interval);
+  else
+    {
+      eassert (HASH_TABLE_P (cpu_log));
+      record_backtrace (XHASH_TABLE (cpu_log), current_sample_interval);
+    }
+}
+
+static void
+deliver_profiler_signal (int signal)
+{
+  deliver_process_signal (signal, handle_profiler_signal);
+}
+
+static enum profiler_cpu_running
+setup_cpu_timer (Lisp_Object sample_interval)
+{
+  struct sigaction action;
+  struct itimerval timer;
+  struct timespec interval;
+
+  if (! RANGED_INTEGERP (1, sample_interval,
+                         (TYPE_MAXIMUM (time_t) < EMACS_INT_MAX / 1000
+                          ? (EMACS_INT) TYPE_MAXIMUM (time_t) * 1000 + 999
+                          : EMACS_INT_MAX)))
+    return NOT_RUNNING;
+
+  current_sample_interval = XINT (sample_interval);
+  interval = make_emacs_time (current_sample_interval / 1000,
+                              current_sample_interval % 1000 * 1000000);
+  emacs_sigaction_init (&action, deliver_profiler_signal);
+  sigaction (SIGPROF, &action, 0);
+
+#ifdef HAVE_TIMER_SETTIME
+  if (! profiler_timer_ok)
+    {
+      /* System clocks to try, in decreasing order of desirability.  */
+      static clockid_t const system_clock[] = {
+#ifdef CLOCK_THREAD_CPUTIME_ID
+        CLOCK_THREAD_CPUTIME_ID,
+#endif
+#ifdef CLOCK_PROCESS_CPUTIME_ID
+        CLOCK_PROCESS_CPUTIME_ID,
+#endif
+#ifdef CLOCK_MONOTONIC
+        CLOCK_MONOTONIC,
+#endif
+        CLOCK_REALTIME
+      };
+      int i;
+      struct sigevent sigev;
+      sigev.sigev_value.sival_ptr = &profiler_timer;
+      sigev.sigev_signo = SIGPROF;
+      sigev.sigev_notify = SIGEV_SIGNAL;
+
+      for (i = 0; i < sizeof system_clock / sizeof *system_clock; i++)
+        if (timer_create (system_clock[i], &sigev, &profiler_timer) == 0)
+          {
+            profiler_timer_ok = 1;
+            break;
+          }
+    }
+
+  if (profiler_timer_ok)
+    {
+      struct itimerspec ispec;
+      ispec.it_value = ispec.it_interval = interval;
+      timer_settime (profiler_timer, 0, &ispec, 0);
+      return TIMER_SETTIME_RUNNING;
+    }
+#endif
+
+  timer.it_value = timer.it_interval = make_timeval (interval);
+  setitimer (ITIMER_PROF, &timer, 0);
+  return SETITIMER_RUNNING;
+}
+
+DEFUN ("profiler-cpu-start", Fprofiler_cpu_start, Sprofiler_cpu_start,
+       1, 1, 0,
+       doc: /* Start or restart the cpu profiler.
+It takes call-stack samples each SAMPLE-INTERVAL milliseconds.
+See also `profiler-log-size' and `profiler-max-stack-depth'.  */)
+  (Lisp_Object sample_interval)
+{
+  if (profiler_cpu_running)
+    error ("Sample profiler is already running");
+
+  if (NILP (cpu_log))
+    {
+      cpu_gc_count = 0;
+      cpu_log = make_log (profiler_log_size,
+                          profiler_max_stack_depth);
+    }
+
+  profiler_cpu_running = setup_cpu_timer (sample_interval);
+  if (! profiler_cpu_running)
+    error ("Invalid sample interval");
+
+  return Qt;
+}
+
+DEFUN ("profiler-cpu-stop", Fprofiler_cpu_stop, Sprofiler_cpu_stop,
+       0, 0, 0,
+       doc: /* Stop the cpu profiler.  The profiler log is not affected.
+Return non-nil if the profiler was running.  */)
+  (void)
+{
+  switch (profiler_cpu_running)
+    {
+    case NOT_RUNNING:
+      return Qnil;
+
+#ifdef HAVE_TIMER_SETTIME
+    case TIMER_SETTIME_RUNNING:
+      {
+        struct itimerspec disable;
+        memset (&disable, 0, sizeof disable);
+        timer_settime (profiler_timer, 0, &disable, 0);
+      }
+      break;
+#endif
+
+    case SETITIMER_RUNNING:
+      {
+        struct itimerval disable;
+        memset (&disable, 0, sizeof disable);
+        setitimer (ITIMER_PROF, &disable, 0);
+      }
+      break;
+    }
+
+  signal (SIGPROF, SIG_IGN);
+  profiler_cpu_running = NOT_RUNNING;
+  return Qt;
+}
+
+DEFUN ("profiler-cpu-running-p",
+       Fprofiler_cpu_running_p, Sprofiler_cpu_running_p,
+       0, 0, 0,
+       doc: /* Return non-nil iff cpu profiler is running.  */)
+  (void)
+{
+  return profiler_cpu_running ? Qt : Qnil;
+}
+
+DEFUN ("profiler-cpu-log", Fprofiler_cpu_log, Sprofiler_cpu_log,
+       0, 0, 0,
+       doc: /* Return the current cpu profiler log.
+The log is a hash-table mapping backtraces to counters which represent
+the amount of time spent at those points.  Every backtrace is a vector
+of functions, where the last few elements may be nil.
+Before returning, a new log is allocated for future samples.  */)
+  (void)
+{
+  Lisp_Object result = cpu_log;
+  /* Here we're making the log visible to Elisp, so it's not safe any
+     more for our use afterwards since we can't rely on its special
+     pre-allocated keys anymore.  So we have to allocate a new one.  */
+  cpu_log = (profiler_cpu_running
+             ? make_log (profiler_log_size, profiler_max_stack_depth)
+             : Qnil);
+  Fputhash (Fmake_vector (make_number (1), Qautomatic_gc),
+            make_number (cpu_gc_count),
+            result);
+  cpu_gc_count = 0;
+  return result;
+}
+#endif /* PROFILER_CPU_SUPPORT */
+
+/* Memory profiler.  */
+
+/* True if memory profiler is running.  */
+bool profiler_memory_running;
+
+static Lisp_Object memory_log;
+
+DEFUN ("profiler-memory-start", Fprofiler_memory_start, Sprofiler_memory_start,
+       0, 0, 0,
+       doc: /* Start/restart the memory profiler.
+The memory profiler will take samples of the call-stack whenever a new
+allocation takes place.  Note that most small allocations only trigger
+the profiler occasionally.
+See also `profiler-log-size' and `profiler-max-stack-depth'.  */)
+  (void)
+{
+  if (profiler_memory_running)
+    error ("Memory profiler is already running");
+
+  if (NILP (memory_log))
+    memory_log = make_log (profiler_log_size,
+                           profiler_max_stack_depth);
+
+  profiler_memory_running = true;
+
+  return Qt;
+}
+
+DEFUN ("profiler-memory-stop",
+       Fprofiler_memory_stop, Sprofiler_memory_stop,
+       0, 0, 0,
+       doc: /* Stop the memory profiler.  The profiler log is not affected.
+Return non-nil if the profiler was running.  */)
+  (void)
+{
+  if (!profiler_memory_running)
+    return Qnil;
+  profiler_memory_running = false;
+  return Qt;
+}
+
+DEFUN ("profiler-memory-running-p",
+       Fprofiler_memory_running_p, Sprofiler_memory_running_p,
+       0, 0, 0,
+       doc: /* Return non-nil if memory profiler is running.  */)
+  (void)
+{
+  return profiler_memory_running ? Qt : Qnil;
+}
+
+DEFUN ("profiler-memory-log",
+       Fprofiler_memory_log, Sprofiler_memory_log,
+       0, 0, 0,
+       doc: /* Return the current memory profiler log.
+The log is a hash-table mapping backtraces to counters which represent
+the amount of memory allocated at those points.  Every backtrace is a vector
+of functions, where the last few elements may be nil.
+Before returning, a new log is allocated for future samples.  */)
+  (void)
+{
+  Lisp_Object result = memory_log;
+  /* Here we're making the log visible to Elisp , so it's not safe any
+     more for our use afterwards since we can't rely on its special
+     pre-allocated keys anymore.  So we have to allocate a new one.  */
+  memory_log = (profiler_memory_running
+                ? make_log (profiler_log_size, profiler_max_stack_depth)
+                : Qnil);
+  return result;
+}
+
+
+/* Signals and probes.  */
+
+/* Record that the current backtrace allocated SIZE bytes.  */
+void
+malloc_probe (size_t size)
+{
+  eassert (HASH_TABLE_P (memory_log));
+  record_backtrace (XHASH_TABLE (memory_log), min (size, MOST_POSITIVE_FIXNUM));
+}
+
+void
+syms_of_profiler (void)
+{
+  DEFVAR_INT ("profiler-max-stack-depth", profiler_max_stack_depth,
+              doc: /* Number of elements from the call-stack recorded in the log.  */);
+  profiler_max_stack_depth = 16;
+  DEFVAR_INT ("profiler-log-size", profiler_log_size,
+              doc: /* Number of distinct call-stacks that can be recorded in a profiler log.
+If the log gets full, some of the least-seen call-stacks will be evicted
+to make room for new entries.  */);
+  profiler_log_size = 10000;
+
+#ifdef PROFILER_CPU_SUPPORT
+  profiler_cpu_running = NOT_RUNNING;
+  cpu_log = Qnil;
+  staticpro (&cpu_log);
+  defsubr (&Sprofiler_cpu_start);
+  defsubr (&Sprofiler_cpu_stop);
+  defsubr (&Sprofiler_cpu_running_p);
+  defsubr (&Sprofiler_cpu_log);
+#endif
+  profiler_memory_running = false;
+  memory_log = Qnil;
+  staticpro (&memory_log);
+  defsubr (&Sprofiler_memory_start);
+  defsubr (&Sprofiler_memory_stop);
+  defsubr (&Sprofiler_memory_running_p);
+  defsubr (&Sprofiler_memory_log);
+}
diff --git a/src/ralloc.c b/src/ralloc.c
index 9a4b1ada229..ab91baae5b5 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -1199,9 +1199,9 @@ r_alloc_init (void)
 #endif
 
 #ifdef DOUG_LEA_MALLOC
-  BLOCK_INPUT;
+  block_input ();
   mallopt (M_TOP_PAD, 64 * 4096);
-  UNBLOCK_INPUT;
+  unblock_input ();
 #else
 #ifndef SYSTEM_MALLOC
   /* Give GNU malloc's morecore some hysteresis so that we move all
diff --git a/src/search.c b/src/search.c
index 5224556fa17..7c084c62e28 100644
--- a/src/search.c
+++ b/src/search.c
@@ -156,7 +156,7 @@ compile_pattern_1 (struct regexp_cache *cp, Lisp_Object pattern, Lisp_Object tra
   re_set_whitespace_regexp (NULL);
 
   re_set_syntax (old);
-  /* UNBLOCK_INPUT;  */
+  /* unblock_input ();  */
   if (val)
     xsignal1 (Qinvalid_regexp, build_string (val));
 
diff --git a/src/sysdep.c b/src/sysdep.c
index dbfd9efc7d4..b7141011d05 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -279,10 +279,6 @@ init_baud_rate (int fd)
 
 
 
-/* Set nonzero to make following function work under dbx
-   (at least for bsd).  */
-int wait_debugging EXTERNALLY_VISIBLE;
-
 #ifndef MSDOS
 
 static void
@@ -290,48 +286,24 @@ wait_for_termination_1 (pid_t pid, int interruptible)
 {
   while (1)
     {
-#if (defined (BSD_SYSTEM) || defined (HPUX)) && !defined (__GNU__)
-      /* Note that kill returns -1 even if the process is just a zombie now.
-         But inevitably a SIGCHLD interrupt should be generated
-         and child_sig will do waitpid and make the process go away.  */
-      /* There is some indication that there is a bug involved with
-         termination of subprocesses, perhaps involving a kernel bug too,
-         but no idea what it is.  Just as a hunch we signal SIGCHLD to see
-         if that causes the problem to go away or get worse.  */
-      sigset_t sigchild_mask;
-      sigemptyset (&sigchild_mask);
-      sigaddset (&sigchild_mask, SIGCHLD);
-      pthread_sigmask (SIG_SETMASK, &sigchild_mask, 0);
-
-      if (0 > kill (pid, 0))
-        {
-          pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
-          kill (getpid (), SIGCHLD);
-          break;
-        }
-      if (wait_debugging)
-        sleep (1);
-      else
-        sigsuspend (&empty_mask);
-#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
 #ifdef WINDOWSNT
       wait (0);
       break;
 #else /* not WINDOWSNT */
-      sigset_t blocked;
-      sigemptyset (&blocked);
-      sigaddset (&blocked, SIGCHLD);
-      pthread_sigmask (SIG_BLOCK, &blocked, 0);
-      errno = 0;
-      if (kill (pid, 0) == -1 && errno == ESRCH)
+      int status;
+      int wait_result = waitpid (pid, &status, 0);
+      if (wait_result < 0)
         {
-          pthread_sigmask (SIG_UNBLOCK, &blocked, 0);
+          if (errno != EINTR)
+            break;
+        }
+      else
+        {
+          record_child_status_change (wait_result, status);
           break;
         }
 
-      sigsuspend (&empty_mask);
 #endif /* not WINDOWSNT */
-#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
       if (interruptible)
         QUIT;
     }
@@ -1438,40 +1410,80 @@ init_system_name (void)
 
 sigset_t empty_mask;
 
-/* Store into *ACTION a signal action suitable for Emacs, with handler
-   HANDLER.  */
-void
-emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
+static struct sigaction process_fatal_action;
+
+static int
+emacs_sigaction_flags (void)
 {
-  sigemptyset (&action->sa_mask);
-  action->sa_handler = handler;
-  action->sa_flags = 0;
-#if defined (SA_RESTART)
+#ifdef SA_RESTART
   /* SA_RESTART causes interruptible functions with timeouts (e.g.,
      'select') to reset their timeout on some platforms (e.g.,
      HP-UX 11), which is not what we want.  Also, when Emacs is
      interactive, we don't want SA_RESTART because we need to poll
      for pending input so we need long-running syscalls to be interrupted
-     after a signal that sets the interrupt_input_pending flag.  */
-  /* Non-interactive keyboard input goes through stdio, where we always
-     want restartable system calls.  */
+     after a signal that sets pending_signals.
+
+     Non-interactive keyboard input goes through stdio, where we
+     always want restartable system calls.  */
   if (noninteractive)
-    action->sa_flags = SA_RESTART;
+    return SA_RESTART;
+#endif
+  return 0;
+}
+
+/* Store into *ACTION a signal action suitable for Emacs, with handler
+   HANDLER.  */
+void
+emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
+{
+  sigemptyset (&action->sa_mask);
+
+  /* When handling a signal, block nonfatal system signals that are caught
+     by Emacs.  This makes race conditions less likely.  */
+  sigaddset (&action->sa_mask, SIGALRM);
+#ifdef SIGCHLD
+  sigaddset (&action->sa_mask, SIGCHLD);
+#endif
+#ifdef SIGDANGER
+  sigaddset (&action->sa_mask, SIGDANGER);
 #endif
+#ifdef PROFILER_CPU_SUPPORT
+  sigaddset (&action->sa_mask, SIGPROF);
+#endif
+#ifdef SIGWINCH
+  sigaddset (&action->sa_mask, SIGWINCH);
+#endif
+  if (! noninteractive)
+    {
+      sigaddset (&action->sa_mask, SIGINT);
+      sigaddset (&action->sa_mask, SIGQUIT);
+#ifdef USABLE_SIGIO
+      sigaddset (&action->sa_mask, SIGIO);
+#endif
+    }
+
+  if (! IEEE_FLOATING_POINT)
+    sigaddset (&action->sa_mask, SIGFPE);
+
+  action->sa_handler = handler;
+  action->sa_flags = emacs_sigaction_flags ();
 }
 
 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
 static pthread_t main_thread;
 #endif
 
-/* If we are on the main thread, handle the signal SIG with HANDLER.
+/* SIG has arrived at the current process.  Deliver it to the main
+   thread, which should handle it with HANDLER.
+
+   If we are on the main thread, handle the signal SIG with HANDLER.
    Otherwise, redirect the signal to the main thread, blocking it from
    this thread.  POSIX says any thread can receive a signal that is
    associated with a process, process group, or asynchronous event.
    On GNU/Linux that is not true, but for other systems (FreeBSD at
    least) it is.  */
 void
-handle_on_main_thread (int sig, signal_handler_t handler)
+deliver_process_signal (int sig, signal_handler_t handler)
 {
   /* Preserve errno, to avoid race conditions with signal handlers that
      might change errno.  Races can occur even in single-threaded hosts.  */
@@ -1494,6 +1506,39 @@ handle_on_main_thread (int sig, signal_handler_t handler)
 
   errno = old_errno;
 }
+
+/* Static location to save a fatal backtrace in a thread.
+   FIXME: If two subsidiary threads fail simultaneously, the resulting
+   backtrace may be garbage.  */
+enum { BACKTRACE_LIMIT_MAX = 500 };
+static void *thread_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
+static int thread_backtrace_npointers;
+
+/* SIG has arrived at the current thread.
+   If we are on the main thread, handle the signal SIG with HANDLER.
+   Otherwise, this is a fatal error in the handling thread.  */
+static void
+deliver_thread_signal (int sig, signal_handler_t handler)
+{
+  int old_errno = errno;
+
+#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
+  if (! pthread_equal (pthread_self (), main_thread))
+    {
+      thread_backtrace_npointers
+        = backtrace (thread_backtrace_buffer, BACKTRACE_LIMIT_MAX);
+      sigaction (sig, &process_fatal_action, 0);
+      pthread_kill (main_thread, sig);
+
+      /* Avoid further damage while the main thread is exiting.  */
+      while (1)
+        sigsuspend (&empty_mask);
+    }
+#endif
+
+  handler (sig);
+  errno = old_errno;
+}
 
 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
 static char *my_sys_siglist[NSIG];
@@ -1503,9 +1548,60 @@ static char *my_sys_siglist[NSIG];
 # define sys_siglist my_sys_siglist
 #endif
 
+/* Handle bus errors, invalid instruction, etc.  */
+static void
+handle_fatal_signal (int sig)
+{
+  terminate_due_to_signal (sig, 40);
+}
+
+static void
+deliver_fatal_signal (int sig)
+{
+  deliver_process_signal (sig, handle_fatal_signal);
+}
+
+static void
+deliver_fatal_thread_signal (int sig)
+{
+  deliver_thread_signal (sig, handle_fatal_signal);
+}
+
+static _Noreturn void
+handle_arith_signal (int sig)
+{
+  pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
+  xsignal0 (Qarith_error);
+}
+
+static void
+deliver_arith_signal (int sig)
+{
+  deliver_thread_signal (sig, handle_arith_signal);
+}
+
+/* Treat SIG as a terminating signal, unless it is already ignored and
+   we are in --batch mode.  Among other things, this makes nohup work.  */
+static void
+maybe_fatal_sig (int sig)
+{
+  bool catch_sig = !noninteractive;
+  if (!catch_sig)
+    {
+      struct sigaction old_action;
+      sigaction (sig, 0, &old_action);
+      catch_sig = old_action.sa_handler != SIG_IGN;
+    }
+  if (catch_sig)
+    sigaction (sig, &process_fatal_action, 0);
+}
+
 void
-init_signals (void)
+init_signals (bool dumping)
 {
+  struct sigaction thread_fatal_action;
+  struct sigaction action;
+
   sigemptyset (&empty_mask);
 
 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
@@ -1515,9 +1611,7 @@ init_signals (void)
 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
   if (! initialized)
     {
-# ifdef SIGABRT
       sys_siglist[SIGABRT] = "Aborted";
-# endif
 # ifdef SIGAIO
       sys_siglist[SIGAIO] = "LAN I/O interrupt";
 # endif
@@ -1545,9 +1639,7 @@ init_signals (void)
 # ifdef SIGEMT
       sys_siglist[SIGEMT] = "Emulation trap";
 # endif
-# ifdef SIGFPE
       sys_siglist[SIGFPE] = "Arithmetic exception";
-# endif
 # ifdef SIGFREEZE
       sys_siglist[SIGFREEZE] = "SIGFREEZE";
 # endif
@@ -1557,12 +1649,8 @@ init_signals (void)
 # ifdef SIGHUP
       sys_siglist[SIGHUP] = "Hangup";
 # endif
-# ifdef SIGILL
       sys_siglist[SIGILL] = "Illegal instruction";
-# endif
-# ifdef SIGINT
       sys_siglist[SIGINT] = "Interrupt";
-# endif
 # ifdef SIGIO
       sys_siglist[SIGIO] = "I/O possible";
 # endif
@@ -1611,9 +1699,7 @@ init_signals (void)
 # ifdef SIGSAK
       sys_siglist[SIGSAK] = "Secure attention";
 # endif
-# ifdef SIGSEGV
       sys_siglist[SIGSEGV] = "Segmentation violation";
-# endif
 # ifdef SIGSOUND
       sys_siglist[SIGSOUND] = "Sound completed";
 # endif
@@ -1626,9 +1712,7 @@ init_signals (void)
 # ifdef SIGSYS
       sys_siglist[SIGSYS] = "Bad argument to system call";
 # endif
-# ifdef SIGTERM
       sys_siglist[SIGTERM] = "Terminated";
-# endif
 # ifdef SIGTHAW
       sys_siglist[SIGTHAW] = "SIGTHAW";
 # endif
@@ -1673,6 +1757,129 @@ init_signals (void)
 # endif
     }
 #endif /* !defined HAVE_STRSIGNAL && !defined HAVE_DECL_SYS_SIGLIST */
+
+  /* Don't alter signal handlers if dumping.  On some machines,
+     changing signal handlers sets static data that would make signals
+     fail to work right when the dumped Emacs is run.  */
+  if (dumping)
+    return;
+
+  sigfillset (&process_fatal_action.sa_mask);
+  process_fatal_action.sa_handler = deliver_fatal_signal;
+  process_fatal_action.sa_flags = emacs_sigaction_flags ();
+
+  sigfillset (&thread_fatal_action.sa_mask);
+  thread_fatal_action.sa_handler = deliver_fatal_thread_signal;
+  thread_fatal_action.sa_flags = process_fatal_action.sa_flags;
+
+  /* SIGINT may need special treatment on MS-Windows.  See
+     http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg01062.html
+     Please update the doc of kill-emacs, kill-emacs-hook, and
+     NEWS if you change this.  */
+
+  maybe_fatal_sig (SIGHUP);
+  maybe_fatal_sig (SIGINT);
+  maybe_fatal_sig (SIGTERM);
+
+  /* Emacs checks for write errors, so it can safely ignore SIGPIPE.
+     However, in batch mode leave SIGPIPE alone, as that causes Emacs
+     to behave more like typical batch applications do.  */
+  if (! noninteractive)
+    signal (SIGPIPE, SIG_IGN);
+
+  sigaction (SIGQUIT, &process_fatal_action, 0);
+  sigaction (SIGILL, &thread_fatal_action, 0);
+  sigaction (SIGTRAP, &thread_fatal_action, 0);
+
+  /* Typically SIGFPE is thread-specific and is fatal, like SIGILL.
+     But on a non-IEEE host SIGFPE can come from a trap in the Lisp
+     interpreter's floating point operations, so treat SIGFPE as an
+     arith-error if it arises in the main thread.  */
+  if (IEEE_FLOATING_POINT)
+    sigaction (SIGFPE, &thread_fatal_action, 0);
+  else
+    {
+      emacs_sigaction_init (&action, deliver_arith_signal);
+      sigaction (SIGFPE, &action, 0);
+    }
+
+#ifdef SIGUSR1
+  add_user_signal (SIGUSR1, "sigusr1");
+#endif
+#ifdef SIGUSR2
+  add_user_signal (SIGUSR2, "sigusr2");
+#endif
+  sigaction (SIGABRT, &thread_fatal_action, 0);
+#ifdef SIGPRE
+  sigaction (SIGPRE, &thread_fatal_action, 0);
+#endif
+#ifdef SIGORE
+  sigaction (SIGORE, &thread_fatal_action, 0);
+#endif
+#ifdef SIGUME
+  sigaction (SIGUME, &thread_fatal_action, 0);
+#endif
+#ifdef SIGDLK
+  sigaction (SIGDLK, &process_fatal_action, 0);
+#endif
+#ifdef SIGCPULIM
+  sigaction (SIGCPULIM, &process_fatal_action, 0);
+#endif
+#ifdef SIGIOT
+  sigaction (SIGIOT, &thread_fatal_action, 0);
+#endif
+#ifdef SIGEMT
+  sigaction (SIGEMT, &thread_fatal_action, 0);
+#endif
+#ifdef SIGBUS
+  sigaction (SIGBUS, &thread_fatal_action, 0);
+#endif
+  sigaction (SIGSEGV, &thread_fatal_action, 0);
+#ifdef SIGSYS
+  sigaction (SIGSYS, &thread_fatal_action, 0);
+#endif
+  sigaction (SIGTERM, &process_fatal_action, 0);
+#ifdef SIGPROF
+  signal (SIGPROF, SIG_IGN);
+#endif
+#ifdef SIGVTALRM
+  sigaction (SIGVTALRM, &process_fatal_action, 0);
+#endif
+#ifdef SIGXCPU
+  sigaction (SIGXCPU, &process_fatal_action, 0);
+#endif
+#ifdef SIGXFSZ
+  sigaction (SIGXFSZ, &process_fatal_action, 0);
+#endif
+
+#ifdef SIGDANGER
+  /* This just means available memory is getting low.  */
+  emacs_sigaction_init (&action, deliver_danger_signal);
+  sigaction (SIGDANGER, &action, 0);
+#endif
+
+  /* AIX-specific signals.  */
+#ifdef SIGGRANT
+  sigaction (SIGGRANT, &process_fatal_action, 0);
+#endif
+#ifdef SIGMIGRATE
+  sigaction (SIGMIGRATE, &process_fatal_action, 0);
+#endif
+#ifdef SIGMSG
+  sigaction (SIGMSG, &process_fatal_action, 0);
+#endif
+#ifdef SIGRETRACT
+  sigaction (SIGRETRACT, &process_fatal_action, 0);
+#endif
+#ifdef SIGSAK
+  sigaction (SIGSAK, &process_fatal_action, 0);
+#endif
+#ifdef SIGSOUND
+  sigaction (SIGSOUND, &process_fatal_action, 0);
+#endif
+#ifdef SIGTALRM
+  sigaction (SIGTALRM, &thread_fatal_action, 0);
+#endif
 }
 
 #ifndef HAVE_RANDOM
@@ -1811,23 +2018,36 @@ snprintf (char *buf, size_t bufsize, char const *format, ...)
 void
 emacs_backtrace (int backtrace_limit)
 {
-  enum { BACKTRACE_LIMIT_MAX = 500 };
-  void *buffer[BACKTRACE_LIMIT_MAX + 1];
+  void *main_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
   int bounded_limit = min (backtrace_limit, BACKTRACE_LIMIT_MAX);
-  int npointers = backtrace (buffer, bounded_limit + 1);
+  void *buffer;
+  int npointers;
+
+  if (thread_backtrace_npointers)
+    {
+      buffer = thread_backtrace_buffer;
+      npointers = thread_backtrace_npointers;
+    }
+  else
+    {
+      buffer = main_backtrace_buffer;
+      npointers = backtrace (buffer, bounded_limit + 1);
+    }
+
   if (npointers)
-    ignore_value (write (STDERR_FILENO, "\nBacktrace:\n", 12));
-  backtrace_symbols_fd (buffer, bounded_limit, STDERR_FILENO);
-  if (bounded_limit < npointers)
-    ignore_value (write (STDERR_FILENO, "...\n", 4));
+    {
+      ignore_value (write (STDERR_FILENO, "\nBacktrace:\n", 12));
+      backtrace_symbols_fd (buffer, npointers, STDERR_FILENO);
+      if (bounded_limit < npointers)
+        ignore_value (write (STDERR_FILENO, "...\n", 4));
+    }
 }
 
 #ifndef HAVE_NTGUI
-/* Using emacs_abort lets GDB return from a breakpoint here.  */
 void
 emacs_abort (void)
 {
-  fatal_error_backtrace (SIGABRT, 10);
+  terminate_due_to_signal (SIGABRT, 10);
 }
 #endif
 
@@ -1910,7 +2130,8 @@ emacs_write (int fildes, const char *buf, ptrdiff_t nbyte)
             {
               /* I originally used `QUIT' but that might causes files to
                  be truncated if you hit C-g in the middle of it.  --Stef  */
-              process_pending_signals ();
+              if (pending_signals)
+                process_pending_signals ();
               continue;
             }
           else
@@ -1975,11 +2196,11 @@ getwd (char *pathname)
   char *npath, *spath;
   extern char *getcwd (char *, size_t);
 
-  BLOCK_INPUT;                  /* getcwd uses malloc */
+  block_input ();                       /* getcwd uses malloc */
   spath = npath = getcwd ((char *) 0, MAXPATHLEN);
   if (spath == 0)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return spath;
     }
   /* On Altos 3068, getcwd can return @hostname/dir, so discard
@@ -1988,7 +2209,7 @@ getwd (char *pathname)
     npath++;
   strcpy (pathname, npath);
   free (spath);                 /* getcwd uses malloc */
-  UNBLOCK_INPUT;
+  unblock_input ();
   return pathname;
 }
 
@@ -2422,7 +2643,7 @@ get_up_time (void)
   FILE *fup;
   EMACS_TIME up = make_emacs_time (0, 0);
 
-  BLOCK_INPUT;
+  block_input ();
   fup = fopen ("/proc/uptime", "r");
 
   if (fup)
@@ -2453,7 +2674,7 @@ get_up_time (void)
         }
       fclose (fup);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return up;
 }
@@ -2467,7 +2688,7 @@ procfs_ttyname (int rdev)
   FILE *fdev = NULL;
   char name[PATH_MAX];
 
-  BLOCK_INPUT;
+  block_input ();
   fdev = fopen ("/proc/tty/drivers", "r");
 
   if (fdev)
@@ -2499,7 +2720,7 @@ procfs_ttyname (int rdev)
         }
       fclose (fdev);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
   return build_string (name);
 }
 
@@ -2509,7 +2730,7 @@ procfs_get_total_memory (void)
   FILE *fmem = NULL;
   unsigned long retval = 2 * 1024 * 1024; /* default: 2GB */
 
-  BLOCK_INPUT;
+  block_input ();
   fmem = fopen ("/proc/meminfo", "r");
 
   if (fmem)
@@ -2528,7 +2749,7 @@ procfs_get_total_memory (void)
         }
       fclose (fmem);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
   return retval;
 }
 
@@ -2574,17 +2795,17 @@ system_process_attributes (Lisp_Object pid)
   /* euid egid */
   uid = st.st_uid;
   attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
-  BLOCK_INPUT;
+  block_input ();
   pw = getpwuid (uid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (pw)
     attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
 
   gid = st.st_gid;
   attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
-  BLOCK_INPUT;
+  block_input ();
   gr = getgrgid (gid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (gr)
     attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
 
@@ -2812,17 +3033,17 @@ system_process_attributes (Lisp_Object pid)
   /* euid egid */
   uid = st.st_uid;
   attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
-  BLOCK_INPUT;
+  block_input ();
   pw = getpwuid (uid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (pw)
     attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
 
   gid = st.st_gid;
   attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
-  BLOCK_INPUT;
+  block_input ();
   gr = getgrgid (gid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (gr)
     attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
 
@@ -2943,17 +3164,17 @@ system_process_attributes (Lisp_Object pid)
 
   attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (proc.ki_uid)), attrs);
 
-  BLOCK_INPUT;
+  block_input ();
   pw = getpwuid (proc.ki_uid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (pw)
     attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
 
   attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (proc.ki_svgid)), attrs);
 
-  BLOCK_INPUT;
+  block_input ();
   gr = getgrgid (proc.ki_svgid);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (gr)
     attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
 
@@ -2993,9 +3214,9 @@ system_process_attributes (Lisp_Object pid)
   attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (proc.ki_pgid)), attrs);
   attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (proc.ki_sid)),  attrs);
 
-  BLOCK_INPUT;
+  block_input ();
   ttyname = proc.ki_tdev == NODEV ? NULL : devname (proc.ki_tdev, S_IFCHR);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (ttyname)
     attrs = Fcons (Fcons (Qtty, build_string (ttyname)), attrs);
 
diff --git a/src/syssignal.h b/src/syssignal.h
index e309e6725b7..ece2515dec9 100644
--- a/src/syssignal.h
+++ b/src/syssignal.h
@@ -18,8 +18,9 @@ You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <signal.h>
+#include <stdbool.h>
 
-extern void init_signals (void);
+extern void init_signals (bool);
 
 #ifdef HAVE_PTHREAD
 #include <pthread.h>
@@ -28,6 +29,11 @@ extern void init_signals (void);
 #define FORWARD_SIGNAL_TO_MAIN_THREAD
 #endif
 
+#if (defined SIGPROF && (defined HAVE_TIMER_SETTIME || defined HAVE_SETITIMER) \
+     && !defined PROFILING)
+# define PROFILER_CPU_SUPPORT
+#endif
+
 extern sigset_t empty_mask;
 
 typedef void (*signal_handler_t) (int);
@@ -39,6 +45,10 @@ extern void emacs_sigaction_init (struct sigaction *, signal_handler_t);
 # define NSIG NSIG_MINIMUM
 #endif
 
+#ifndef emacs_raise
+# define emacs_raise(sig) raise (sig)
+#endif
+
 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
    Must do that using the killpg call.  */
 #ifdef BSD_SYSTEM
@@ -64,4 +74,4 @@ extern void emacs_sigaction_init (struct sigaction *, signal_handler_t);
 char *strsignal (int);
 #endif
 
-void handle_on_main_thread (int, signal_handler_t);
+void deliver_process_signal (int, signal_handler_t);
diff --git a/src/syswait.h b/src/syswait.h
index 9d84876d4be..aa4c4bcf527 100644
--- a/src/syswait.h
+++ b/src/syswait.h
@@ -51,4 +51,11 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define WTERMSIG(status) ((status) & 0x7f)
 #endif
 
+/* Defined in process.c.  */
+extern void record_child_status_change (pid_t, int);
+
+/* Defined in sysdep.c.  */
+extern void wait_for_termination (pid_t);
+extern void interruptible_wait_for_termination (pid_t);
+
 #endif /* EMACS_SYSWAIT_H */
diff --git a/src/term.c b/src/term.c
index f4117d67dec..189fb783cbc 100644
--- a/src/term.c
+++ b/src/term.c
@@ -753,13 +753,13 @@ tty_write_glyphs (struct frame *f, struct glyph *string, int len)
       conversion_buffer = encode_terminal_code (string, n, coding);
       if (coding->produced > 0)
         {
-          BLOCK_INPUT;
+          block_input ();
           fwrite (conversion_buffer, 1, coding->produced, tty->output);
           if (ferror (tty->output))
             clearerr (tty->output);
           if (tty->termscript)
             fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
       string += n;
 
@@ -814,13 +814,13 @@ tty_write_glyphs_with_face (register struct frame *f, register struct glyph *str
   conversion_buffer = encode_terminal_code (string, len, coding);
   if (coding->produced > 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       fwrite (conversion_buffer, 1, coding->produced, tty->output);
       if (ferror (tty->output))
         clearerr (tty->output);
       if (tty->termscript)
         fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* Turn appearance modes off.  */
@@ -900,13 +900,13 @@ tty_insert_glyphs (struct frame *f, struct glyph *start, int len)
 
       if (coding->produced > 0)
         {
-          BLOCK_INPUT;
+          block_input ();
           fwrite (conversion_buffer, 1, coding->produced, tty->output);
           if (ferror (tty->output))
             clearerr (tty->output);
           if (tty->termscript)
             fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 
       OUTPUT1_IF (tty, tty->TS_pad_inserted_char);
diff --git a/src/termhooks.h b/src/termhooks.h
index 53e401de409..f35bd929af1 100644
--- a/src/termhooks.h
+++ b/src/termhooks.h
@@ -591,8 +591,7 @@ struct terminal
   /* Called to read input events.
 
      TERMINAL indicates which terminal device to read from.  Input
-     events should be read into BUF, the size of which is given in
-     SIZE.
+     events should be read into HOLD_QUIT.
 
      A positive return value indicates that that many input events
      were read into BUF.
diff --git a/src/w16select.c b/src/w16select.c
index a3f6f1fb9ae..b8aaa3619ba 100644
--- a/src/w16select.c
+++ b/src/w16select.c
@@ -459,7 +459,7 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
   if ( !FRAME_MSDOS_P (XFRAME (frame)))
     goto done;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!open_clipboard ())
     goto error;
@@ -520,7 +520,7 @@ DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_dat
 
  unblock:
   xfree (dst);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Notify user if the text is too large to fit into DOS memory.
      (This will happen somewhere after 600K bytes (470K in DJGPP v1.x),
@@ -565,7 +565,7 @@ DEFUN ("w16-get-clipboard-data", Fw16_get_clipboard_data, Sw16_get_clipboard_dat
   if ( !FRAME_MSDOS_P (XFRAME (frame)))
     goto done;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!open_clipboard ())
     goto unblock;
@@ -626,7 +626,7 @@ DEFUN ("w16-get-clipboard-data", Fw16_get_clipboard_data, Sw16_get_clipboard_dat
   close_clipboard ();
 
  unblock:
-  UNBLOCK_INPUT;
+  unblock_input ();
 
  done:
 
diff --git a/src/w32.c b/src/w32.c
index bcb0511e2fa..3154c725abf 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -6521,33 +6521,27 @@ sys_localtime (const time_t *t)
 
 
 
-/* Delayed loading of libraries.  */
-
-Lisp_Object Vlibrary_cache;
-
-/* The argument LIBRARIES is an alist that associates a symbol
-   LIBRARY_ID, identifying an external DLL library known to Emacs, to
-   a list of filenames under which the library is usually found.  In
-   most cases, the argument passed as LIBRARIES is the variable
-   `dynamic-library-alist', which is initialized to a list of common
-   library names.  If the function loads the library successfully, it
-   returns the handle of the DLL, and records the filename in the
-   property :loaded-from of LIBRARY_ID; it returns NULL if the library
-   could not be found, or when it was already loaded (because the
-   handle is not recorded anywhere, and so is lost after use).  It
-   would be trivial to save the handle too in :loaded-from, but
-   currently there's no use case for it.  */
+/* Try loading LIBRARY_ID from the file(s) specified in
+   Vdynamic_library_alist.  If the library is loaded successfully,
+   return the handle of the DLL, and record the filename in the
+   property :loaded-from of LIBRARY_ID.  If the library could not be
+   found, or when it was already loaded (because the handle is not
+   recorded anywhere, and so is lost after use), return NULL.
+
+   We could also save the handle in :loaded-from, but currently
+   there's no use case for it.  */
 HMODULE
-w32_delayed_load (Lisp_Object libraries, Lisp_Object library_id)
+w32_delayed_load (Lisp_Object library_id)
 {
   HMODULE library_dll = NULL;
 
   CHECK_SYMBOL (library_id);
 
-  if (CONSP (libraries) && NILP (Fassq (library_id, Vlibrary_cache)))
+  if (CONSP (Vdynamic_library_alist)
+      && NILP (Fassq (library_id, Vlibrary_cache)))
     {
       Lisp_Object found = Qnil;
-      Lisp_Object dlls = Fassq (library_id, libraries);
+      Lisp_Object dlls = Fassq (library_id, Vdynamic_library_alist);
 
       if (CONSP (dlls))
         for (dlls = XCDR (dlls); CONSP (dlls); dlls = XCDR (dlls))
@@ -6626,8 +6620,9 @@ check_windows_init_file (void)
 }
 
 void
-term_ntproc (void)
+term_ntproc (int ignored)
 {
+  (void)ignored;
   /* shutdown the socket interface if necessary */
   term_winsock ();
 
@@ -6635,7 +6630,7 @@ term_ntproc (void)
 }
 
 void
-init_ntproc (void)
+init_ntproc (int dumping)
 {
   /* Initialize the socket interface now if available and requested by
      the user by defining PRELOAD_WINSOCK; otherwise loading will be
@@ -6712,7 +6707,8 @@ init_ntproc (void)
 
   /* unfortunately, atexit depends on implementation of malloc */
   /* atexit (term_ntproc); */
-  signal (SIGABRT, term_ntproc);
+  if (!dumping)
+    signal (SIGABRT, term_ntproc);
 
   /* determine which drives are fixed, for GetCachedVolumeInformation */
   {
@@ -6769,9 +6765,6 @@ globals_of_w32 (void)
 
   DEFSYM (QCloaded_from, ":loaded-from");
 
-  Vlibrary_cache = Qnil;
-  staticpro (&Vlibrary_cache);
-
   g_b_init_is_windows_9x = 0;
   g_b_init_open_process_token = 0;
   g_b_init_get_token_information = 0;
diff --git a/src/w32.h b/src/w32.h
index 73d57a65a4a..a833c8f4315 100644
--- a/src/w32.h
+++ b/src/w32.h
@@ -127,8 +127,8 @@ extern void reset_standard_handles (int in, int out,
 /* Return the string resource associated with KEY of type TYPE.  */
 extern LPBYTE w32_get_resource (char * key, LPDWORD type);
 
-extern void init_ntproc (void);
-extern void term_ntproc (void);
+extern void init_ntproc (int);
+extern void term_ntproc (int);
 extern void globals_of_w32 (void);
 extern void syms_of_w32term (void);
 extern void syms_of_w32fns (void);
@@ -145,8 +145,8 @@ extern void check_windows_init_file (void);
 extern int _sys_read_ahead (int fd);
 extern int _sys_wait_accept (int fd);
 
-extern Lisp_Object Vlibrary_cache, QCloaded_from;
-extern HMODULE w32_delayed_load (Lisp_Object, Lisp_Object);
+extern Lisp_Object QCloaded_from;
+extern HMODULE w32_delayed_load (Lisp_Object);
 
 #ifdef HAVE_GNUTLS
 #include <gnutls/gnutls.h>
diff --git a/src/w32fns.c b/src/w32fns.c
index be008bb18c8..808e19d0b66 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -364,7 +364,7 @@ if the entry is new.  */)
 
   XSETINT (rgb, RGB (XUINT (red), XUINT (green), XUINT (blue)));
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* replace existing entry in w32-color-map or add new entry. */
   entry = Fassoc (name, Vw32_color_map);
@@ -379,7 +379,7 @@ if the entry is new.  */)
       Fsetcdr (entry, rgb);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return (oldrgb);
 }
@@ -642,7 +642,7 @@ w32_default_color_map (void)
   colormap_t *pc = w32_color_map;
   Lisp_Object cmap;
 
-  BLOCK_INPUT;
+  block_input ();
 
   cmap = Qnil;
 
@@ -652,7 +652,7 @@ w32_default_color_map (void)
                          make_number (pc->colorref)),
                   cmap);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return (cmap);
 }
@@ -669,7 +669,7 @@ w32_color_map_lookup (char *colorname)
 {
   Lisp_Object tail, ret = Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
 
   for (tail = Vw32_color_map; CONSP (tail); tail = XCDR (tail))
     {
@@ -689,7 +689,7 @@ w32_color_map_lookup (char *colorname)
       QUIT;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return ret;
 }
@@ -701,7 +701,7 @@ add_system_logical_colors_to_map (Lisp_Object *system_colors)
   HKEY colors_key;
 
   /* Other registry operations are done with input blocked.  */
-  BLOCK_INPUT;
+  block_input ();
 
   /* Look for "Control Panel/Colors" under User and Machine registry
      settings.  */
@@ -739,7 +739,7 @@ add_system_logical_colors_to_map (Lisp_Object *system_colors)
       RegCloseKey (colors_key);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -748,7 +748,7 @@ x_to_w32_color (char * colorname)
 {
   register Lisp_Object ret = Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (colorname[0] == '#')
     {
@@ -801,7 +801,7 @@ x_to_w32_color (char * colorname)
               pos += 0x8;
               if (i == 2)
                 {
-                  UNBLOCK_INPUT;
+                  unblock_input ();
                   XSETINT (ret, colorval);
                   return ret;
                 }
@@ -855,7 +855,7 @@ x_to_w32_color (char * colorname)
             {
               if (*end != '\0')
                 break;
-              UNBLOCK_INPUT;
+              unblock_input ();
               XSETINT (ret, colorval);
               return ret;
             }
@@ -897,7 +897,7 @@ x_to_w32_color (char * colorname)
             {
               if (*end != '\0')
                 break;
-              UNBLOCK_INPUT;
+              unblock_input ();
               XSETINT (ret, colorval);
               return ret;
             }
@@ -932,7 +932,7 @@ x_to_w32_color (char * colorname)
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return ret;
 }
 
@@ -1235,7 +1235,7 @@ x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     f->output_data.w32->mouse_pixel = FRAME_FOREGROUND_PIXEL (f);
 
 #if 0 /* TODO : Mouse cursor customization.  */
-  BLOCK_INPUT;
+  block_input ();
 
   /* It's not okay to crash if the user selects a screwy cursor.  */
   count = x_catch_errors (FRAME_W32_DISPLAY (f));
@@ -1358,7 +1358,7 @@ x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   f->output_data.w32->hand_cursor = hand_cursor;
 
   XFlush (FRAME_W32_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   update_face_from_frame_parameter (f, Qmouse_color, arg);
 #endif /* TODO */
@@ -1390,12 +1390,12 @@ x_set_cursor_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 
   if (FRAME_W32_WINDOW (f) != 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       /* Update frame's cursor_gc.  */
       f->output_data.w32->cursor_gc->foreground = fore_pixel;
       f->output_data.w32->cursor_gc->background = pixel;
 
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       if (FRAME_VISIBLE_P (f))
         {
@@ -1466,16 +1466,16 @@ x_set_icon_type (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   if (SYMBOLP (arg) && SYMBOLP (oldval) && EQ (arg, oldval))
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   result = x_bitmap_icon (f, arg);
   if (result)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       error ("No icon window available");
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 void
@@ -1495,7 +1495,7 @@ x_set_icon_name (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   if (f->output_data.w32->icon_bitmap != 0)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   result = x_text_icon (f,
                         SSDATA ((!NILP (f->icon_name)
@@ -1506,7 +1506,7 @@ x_set_icon_name (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 
   if (result)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       error ("No icon window available");
     }
 
@@ -1521,7 +1521,7 @@ x_set_icon_name (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     }
 
   XFlush (FRAME_W32_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif
 }
 
@@ -1623,13 +1623,13 @@ x_set_tool_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
       int width = FRAME_PIXEL_WIDTH (f);
       int y = nlines * FRAME_LINE_HEIGHT (f);
 
-      BLOCK_INPUT;
+      block_input ();
       {
         HDC hdc = get_frame_dc (f);
         w32_clear_area (f, hdc, 0, y, width, height);
         release_frame_dc (f, hdc);
       }
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       if (WINDOWP (f->tool_bar_window))
         clear_glyph_matrix (XWINDOW (f->tool_bar_window)->current_matrix);
@@ -1697,9 +1697,9 @@ x_set_name (struct frame *f, Lisp_Object name, int explicit)
       if (STRING_MULTIBYTE (name))
         name = ENCODE_SYSTEM (name);
 
-      BLOCK_INPUT;
+      block_input ();
       SetWindowText (FRAME_W32_WINDOW (f), SDATA (name));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -1743,9 +1743,9 @@ x_set_title (struct frame *f, Lisp_Object name, Lisp_Object old_name)
       if (STRING_MULTIBYTE (name))
         name = ENCODE_SYSTEM (name);
 
-      BLOCK_INPUT;
+      block_input ();
       SetWindowText (FRAME_W32_WINDOW (f), SDATA (name));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -3896,7 +3896,7 @@ my_create_tip_window (struct frame *f)
 static void
 w32_window (struct frame *f, long window_prompting, int minibuffer_only)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   /* Use the resource name as the top-level window name
      for looking up resources.  Make a non-Lisp copy
@@ -3928,7 +3928,7 @@ w32_window (struct frame *f, long window_prompting, int minibuffer_only)
     x_set_name (f, name, explicit);
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (!minibuffer_only && FRAME_EXTERNAL_MENU_BAR (f))
     initialize_frame_menubar (f);
@@ -3959,7 +3959,7 @@ x_icon (struct frame *f, Lisp_Object parms)
   else if (!EQ (icon_x, Qunbound) || !EQ (icon_y, Qunbound))
     error ("Both left and top icon corners of icon must be specified");
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (! EQ (icon_x, Qunbound))
     x_wm_set_icon_position (f, XINT (icon_x), XINT (icon_y));
@@ -3976,7 +3976,7 @@ x_icon (struct frame *f, Lisp_Object parms)
                            : f->name)));
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3985,7 +3985,7 @@ x_make_gc (struct frame *f)
 {
   XGCValues gc_values;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Create the GC's of this frame.
      Note that many default values are used.  */
@@ -4005,7 +4005,7 @@ x_make_gc (struct frame *f)
   f->output_data.w32->white_relief.gc = 0;
   f->output_data.w32->black_relief.gc = 0;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -4351,9 +4351,9 @@ This function is an internal primitive--use `make-frame' instead.  */)
   /* Tell the server what size and position, etc, we want, and how
      badly we want them.  This should be done after we have the menu
      bar so that its size can be taken into account.  */
-  BLOCK_INPUT;
+  block_input ();
   x_wm_set_size_hint (f, window_prompting, 0);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Make the window appear on the frame and enable display, unless
      the caller says not to.  However, with explicit parent, Emacs
@@ -4862,11 +4862,11 @@ If DISPLAY is nil, that stands for the selected frame's display.  */)
   if (dpyinfo->reference_count > 0)
     error ("Display still has frames on it");
 
-  BLOCK_INPUT;
+  block_input ();
   x_destroy_all_bitmaps (dpyinfo);
 
   x_delete_display (dpyinfo);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -4935,7 +4935,7 @@ FRAME.  Default is to change on the edit X window.  */)
   CHECK_STRING (prop);
   CHECK_STRING (value);
 
-  BLOCK_INPUT;
+  block_input ();
   prop_atom = XInternAtom (FRAME_W32_DISPLAY (f), SDATA (prop), False);
   XChangeProperty (FRAME_W32_DISPLAY (f), FRAME_W32_WINDOW (f),
                    prop_atom, XA_STRING, 8, PropModeReplace,
@@ -4943,7 +4943,7 @@ FRAME.  Default is to change on the edit X window.  */)
 
   /* Make sure the property is set when we return.  */
   XFlush (FRAME_W32_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return value;
 }
@@ -4959,13 +4959,13 @@ FRAME nil or omitted means use the selected frame.  Value is PROP.  */)
   Atom prop_atom;
 
   CHECK_STRING (prop);
-  BLOCK_INPUT;
+  block_input ();
   prop_atom = XInternAtom (FRAME_W32_DISPLAY (f), SDATA (prop), False);
   XDeleteProperty (FRAME_W32_DISPLAY (f), FRAME_W32_WINDOW (f), prop_atom);
 
   /* Make sure the property is removed when we return.  */
   XFlush (FRAME_W32_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return prop;
 }
@@ -5001,7 +5001,7 @@ no value of TYPE (always string in the MS Windows case).  */)
   unsigned long actual_size, bytes_remaining;
 
   CHECK_STRING (prop);
-  BLOCK_INPUT;
+  block_input ();
   prop_atom = XInternAtom (FRAME_W32_DISPLAY (f), SDATA (prop), False);
   rc = XGetWindowProperty (FRAME_W32_DISPLAY (f), FRAME_W32_WINDOW (f),
                            prop_atom, 0, 0, False, XA_STRING,
@@ -5026,7 +5026,7 @@ no value of TYPE (always string in the MS Windows case).  */)
       XFree (tmp_data);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return prop_value;
 
@@ -5349,9 +5349,9 @@ x_create_tip_frame (struct w32_display_info *dpyinfo,
   f->left_fringe_width = 0;
   f->right_fringe_width = 0;
 
-  BLOCK_INPUT;
+  block_input ();
   my_create_tip_window (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   x_make_gc (f);
 
@@ -5457,11 +5457,11 @@ compute_tip_xy (struct frame *f,
       max_x = x_display_pixel_width (FRAME_W32_DISPLAY_INFO (f));
       max_y = x_display_pixel_height (FRAME_W32_DISPLAY_INFO (f));
 
-      BLOCK_INPUT;
+      block_input ();
       GetCursorPos (&pt);
       *root_x = pt.x;
       *root_y = pt.y;
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       /* If multiple monitor support is available, constrain the tip onto
          the current monitor. This improves the above by allowing negative
@@ -5596,7 +5596,7 @@ Text larger than the specified size is clipped.  */)
               call1 (Qcancel_timer, timer);
             }
 
-          BLOCK_INPUT;
+          block_input ();
           compute_tip_xy (f, parms, dx, dy, FRAME_PIXEL_WIDTH (f),
                           FRAME_PIXEL_HEIGHT (f), &root_x, &root_y);
 
@@ -5610,7 +5610,7 @@ Text larger than the specified size is clipped.  */)
                         0, 0, 0, 0,
                         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
 
-          UNBLOCK_INPUT;
+          unblock_input ();
           goto start_timer;
         }
     }
@@ -5637,7 +5637,7 @@ Text larger than the specified size is clipped.  */)
 
   /* Block input until the tip has been fully drawn, to avoid crashes
      when drawing tips in menus.  */
-  BLOCK_INPUT;
+  block_input ();
 
   /* Create a frame for the tooltip, and record it in the global
      variable tip_frame.  */
@@ -5809,7 +5809,7 @@ Text larger than the specified size is clipped.  */)
   w->must_be_updated_p = 1;
   update_single_window (w, 1);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Restore original current buffer.  */
   set_buffer_internal_1 (old_buffer);
@@ -6002,7 +6002,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
 
     /* Prevent redisplay.  */
     specbind (Qinhibit_redisplay, Qt);
-    BLOCK_INPUT;
+    block_input ();
 
     memset (&new_file_details, 0, sizeof (new_file_details));
     /* Apparently NT4 crashes if you give it an unexpected size.
@@ -6041,7 +6041,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
 
     file_opened = GetOpenFileName (file_details);
 
-    UNBLOCK_INPUT;
+    unblock_input ();
 
     if (file_opened)
       {
diff --git a/src/w32inevt.c b/src/w32inevt.c
index a96d8d70483..ebb95dcace5 100644
--- a/src/w32inevt.c
+++ b/src/w32inevt.c
@@ -567,7 +567,7 @@ w32_console_mouse_position (FRAME_PTR *f,
                             Lisp_Object *y,
                             Time *time)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   insist = insist;
 
@@ -580,7 +580,7 @@ w32_console_mouse_position (FRAME_PTR *f,
   XSETINT (*y, movement_pos.Y);
   *time = movement_time;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Remember mouse motion and notify emacs.  */
@@ -749,14 +749,7 @@ w32_console_read_socket (struct terminal *terminal,
   int nev, add;
   int isdead;
 
-  if (interrupt_input_blocked)
-    {
-      interrupt_input_pending = 1;
-      return -1;
-    }
-
-  interrupt_input_pending = 0;
-  BLOCK_INPUT;
+  block_input ();
 
   for (;;)
     {
@@ -818,6 +811,6 @@ w32_console_read_socket (struct terminal *terminal,
   if (!w32_use_full_screen_buffer)
     maybe_generate_resize_event ();
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return nev;
 }
diff --git a/src/w32menu.c b/src/w32menu.c
index fa7db64f147..fb1cb606940 100644
--- a/src/w32menu.c
+++ b/src/w32menu.c
@@ -85,7 +85,7 @@ MessageBoxW_Proc unicode_message_box = NULL;
 
 Lisp_Object Qdebug_on_next_call;
 
-void set_frame_menubar (FRAME_PTR, int, int);
+void set_frame_menubar (FRAME_PTR, bool, bool);
 
 #ifdef HAVE_DIALOGS
 static Lisp_Object w32_dialog_show (FRAME_PTR, int, Lisp_Object, char**);
@@ -221,9 +221,9 @@ otherwise it is "Question". */)
     list_of_panes (Fcons (contents, Qnil));
 
     /* Display them in a dialog box.  */
-    BLOCK_INPUT;
+    block_input ();
     selection = w32_dialog_show (f, 0, title, header, &error_name);
-    UNBLOCK_INPUT;
+    unblock_input ();
 
     discard_menu_items ();
     FRAME_X_DISPLAY_INFO (f)->grabbed = 0;
@@ -356,7 +356,7 @@ menubar_selection_callback (FRAME_PTR f, void * client_data)
    it is set the first time this is called, from initialize_frame_menubar.  */
 
 void
-set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
+set_frame_menubar (FRAME_PTR f, bool first_time, bool deep_p)
 {
   HMENU menubar_widget = f->output_data.w32->menubar_widget;
   Lisp_Object items;
@@ -571,7 +571,7 @@ set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
 
   /* Create or update the menu bar widget.  */
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (menubar_widget)
     {
@@ -601,7 +601,7 @@ set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
       x_set_window_size (f, 0, FRAME_COLS (f), FRAME_LINES (f));
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Called from Fx_create_frame to create the initial menubar of a frame
@@ -624,7 +624,7 @@ initialize_frame_menubar (FRAME_PTR f)
 void
 free_frame_menubar (FRAME_PTR f)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   {
     HMENU old = GetMenu (FRAME_W32_WINDOW (f));
@@ -633,7 +633,7 @@ free_frame_menubar (FRAME_PTR f)
     DestroyMenu (old);
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
diff --git a/src/w32proc.c b/src/w32proc.c
index 26a0925ad87..b367b42d8c6 100644
--- a/src/w32proc.c
+++ b/src/w32proc.c
@@ -86,19 +86,34 @@ typedef void (_CALLBACK_ *signal_handler) (int);
 /* Signal handlers...SIG_DFL == 0 so this is initialized correctly.  */
 static signal_handler sig_handlers[NSIG];
 
-/* Fake signal implementation to record the SIGCHLD handler.  */
+/* Improve on the CRT 'signal' implementation so that we could record
+   the SIGCHLD handler.  */
 signal_handler
 sys_signal (int sig, signal_handler handler)
 {
   signal_handler old;
 
-  if (sig != SIGCHLD)
+  /* SIGCHLD is needed for supporting subprocesses, see sys_kill
+     below.  All the others are the only ones supported by the MS
+     runtime.  */
+  if (!(sig == SIGCHLD || sig == SIGSEGV || sig == SIGILL
+        || sig == SIGFPE || sig == SIGABRT || sig == SIGTERM))
     {
       errno = EINVAL;
       return SIG_ERR;
     }
   old = sig_handlers[sig];
-  sig_handlers[sig] = handler;
+  /* SIGABRT is treated specially because w32.c installs term_ntproc
+     as its handler, so we don't want to override that afterwards.
+     Aborting Emacs works specially anyway: either by calling
+     emacs_abort directly or through terminate_due_to_signal, which
+     calls emacs_abort through emacs_raise.  */
+  if (!(sig == SIGABRT && old == term_ntproc))
+    {
+      sig_handlers[sig] = handler;
+      if (sig != SIGCHLD)
+        signal (sig, handler);
+    }
   return old;
 }
 
@@ -106,23 +121,26 @@ sys_signal (int sig, signal_handler handler)
 int
 sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
 {
-  signal_handler old;
+  signal_handler old = SIG_DFL;
+  int retval = 0;
 
-  if (sig != SIGCHLD)
+  if (act)
+    old = sys_signal (sig, act->sa_handler);
+  else if (oact)
+    old = sig_handlers[sig];
+
+  if (old == SIG_ERR)
     {
       errno = EINVAL;
-      return -1;
+      retval = -1;
     }
-  old = sig_handlers[sig];
-  if (act)
-    sig_handlers[sig] = act->sa_handler;
   if (oact)
     {
       oact->sa_handler = old;
       oact->sa_flags = 0;
       oact->sa_mask = empty_mask;
     }
-  return 0;
+  return retval;
 }
 
 /* Defined in <process.h> which conflicts with the local copy */
@@ -1420,6 +1438,7 @@ find_child_console (HWND hwnd, LPARAM arg)
   return TRUE;
 }
 
+/* Emulate 'kill', but only for other processes.  */
 int
 sys_kill (int pid, int sig)
 {
@@ -1428,9 +1447,6 @@ sys_kill (int pid, int sig)
   int need_to_free = 0;
   int rc = 0;
 
-  if (pid == getpid () && sig == SIGABRT)
-    emacs_abort ();
-
   /* Only handle signals that will result in the process dying */
   if (sig != SIGINT && sig != SIGKILL && sig != SIGQUIT && sig != SIGHUP)
     {
@@ -1441,6 +1457,11 @@ sys_kill (int pid, int sig)
   cp = find_child_pid (pid);
   if (cp == NULL)
     {
+      /* We were passed a PID of something other than our subprocess.
+         If that is our own PID, we will send to ourself a message to
+         close the selected frame, which does not necessarily
+         terminates Emacs.  But then we are not supposed to call
+         sys_kill with our own PID.  */
       proc_hand = OpenProcess (PROCESS_TERMINATE, 0, pid);
       if (proc_hand == NULL)
         {
diff --git a/src/w32reg.c b/src/w32reg.c
index 8a6a3c853b1..8b6c76503a6 100644
--- a/src/w32reg.c
+++ b/src/w32reg.c
@@ -84,7 +84,7 @@ w32_get_string_resource (char *name, char *class, DWORD dwexptype)
 
  trykey:
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Check both the current user and the local machine to see if we have
      any resources */
@@ -115,7 +115,7 @@ w32_get_string_resource (char *name, char *class, DWORD dwexptype)
       RegCloseKey (hrootkey);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (!ok)
     {
diff --git a/src/w32select.c b/src/w32select.c
index 11c68c9c617..66f9f7ab041 100644
--- a/src/w32select.c
+++ b/src/w32select.c
@@ -391,7 +391,7 @@ run_protected (Lisp_Object (*code) (Lisp_Object), Lisp_Object arg)
   extern int waiting_for_input; /* from keyboard.c */
   int owfi;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Fsignal calls emacs_abort () if it sees that waiting_for_input is
      set.  */
@@ -402,7 +402,7 @@ run_protected (Lisp_Object (*code) (Lisp_Object), Lisp_Object arg)
 
   waiting_for_input = owfi;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static Lisp_Object
@@ -474,7 +474,10 @@ term_w32select (void)
 {
   /* This is needed to trigger WM_RENDERALLFORMATS. */
   if (clipboard_owner != NULL)
-    DestroyWindow (clipboard_owner);
+    {
+      DestroyWindow (clipboard_owner);
+      clipboard_owner = NULL;
+    }
 }
 
 static void
@@ -694,7 +697,7 @@ DEFUN ("w32-set-clipboard-data", Fw32_set_clipboard_data,
   current_num_nls = 0;
   current_requires_encoding = 0;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Check for non-ASCII characters.  While we are at it, count the
      number of LFs, so we know how many CRs we will have to add later
@@ -782,7 +785,7 @@ DEFUN ("w32-set-clipboard-data", Fw32_set_clipboard_data,
   current_coding_system = Qnil;
 
  done:
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return (ok ? string : Qnil);
 }
@@ -810,7 +813,7 @@ DEFUN ("w32-get-clipboard-data", Fw32_get_clipboard_data,
   setup_config ();
   actual_clipboard_type = cfg_clipboard_type;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!OpenClipboard (clipboard_owner))
     goto done;
@@ -1000,7 +1003,7 @@ DEFUN ("w32-get-clipboard-data", Fw32_get_clipboard_data,
   CloseClipboard ();
 
  done:
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return (ret);
 }
diff --git a/src/w32term.c b/src/w32term.c
index b8227c52fed..5d5e572c475 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -197,7 +197,7 @@ static void w32_define_cursor (Window, Cursor);
 
 void x_lower_frame (struct frame *);
 void x_scroll_bar_clear (struct frame *);
-void x_wm_set_size_hint (struct frame *, long, int);
+void x_wm_set_size_hint (struct frame *, long, bool);
 void x_raise_frame (struct frame *);
 void x_set_window_size (struct frame *, int, int, int);
 void x_wm_set_window_state (struct frame *, int);
@@ -563,7 +563,7 @@ x_update_window_begin (struct window *w)
   updated_window = w;
   set_output_cursor (&w->cursor);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (f == hlinfo->mouse_face_mouse_frame)
     {
@@ -602,7 +602,7 @@ x_update_window_begin (struct window *w)
 #endif /* 0 */
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Draw a vertical window border from (x,y0) to (x,y1)  */
@@ -652,7 +652,7 @@ x_update_window_end (struct window *w, int cursor_on_p,
 
   if (!w->pseudo_window_p)
     {
-      BLOCK_INPUT;
+      block_input ();
 
       if (cursor_on_p)
         display_and_set_cursor (w, 1, output_cursor.hpos,
@@ -662,7 +662,7 @@ x_update_window_end (struct window *w, int cursor_on_p,
       if (draw_window_fringes (w, 1))
         x_draw_vertical_border (w);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* If a row with mouse-face was overwritten, arrange for
@@ -714,13 +714,13 @@ w32_frame_up_to_date (struct frame *f)
       if (hlinfo->mouse_face_deferred_gc
           || f == hlinfo->mouse_face_mouse_frame)
         {
-          BLOCK_INPUT;
+          block_input ();
           if (hlinfo->mouse_face_mouse_frame)
             note_mouse_highlight (hlinfo->mouse_face_mouse_frame,
                                   hlinfo->mouse_face_mouse_x,
                                   hlinfo->mouse_face_mouse_y);
           hlinfo->mouse_face_deferred_gc = 0;
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
 }
@@ -761,7 +761,7 @@ x_after_update_window_line (struct glyph_row *desired_row)
     {
       int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
 
-      BLOCK_INPUT;
+      block_input ();
       {
         HDC hdc = get_frame_dc (f);
         w32_clear_area (f, hdc, 0, y, width, height);
@@ -769,7 +769,7 @@ x_after_update_window_line (struct glyph_row *desired_row)
                         y, width, height);
         release_frame_dc (f, hdc);
       }
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -2646,7 +2646,7 @@ x_clear_frame (struct frame *f)
 
   /* We don't set the output cursor here because there will always
      follow an explicit cursor_to.  */
-  BLOCK_INPUT;
+  block_input ();
 
   w32_clear_window (f);
 
@@ -2654,7 +2654,7 @@ x_clear_frame (struct frame *f)
      colors or something like that, then they should be notified.  */
   x_scroll_bar_clear (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2663,7 +2663,7 @@ x_clear_frame (struct frame *f)
 static void
 w32_ring_bell (struct frame *f)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   if (FRAME_W32_P (f) && visible_bell)
     {
@@ -2680,7 +2680,7 @@ w32_ring_bell (struct frame *f)
   else
       w32_sys_ring_bell (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2779,7 +2779,7 @@ x_scroll_run (struct window *w, struct run *run)
       expect_dirty = CreateRectRgn (x, y, x + width, to_y);
     }
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Cursor off.  Will be switched on again in x_update_window_end.  */
   updated_window = w;
@@ -2813,7 +2813,7 @@ x_scroll_run (struct window *w, struct run *run)
     DeleteObject (combined);
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   DeleteObject (expect_dirty);
 }
 
@@ -2998,9 +2998,9 @@ x_get_keysym_name (int keysym)
   /* Make static so we can always return it */
   static char value[100];
 
-  BLOCK_INPUT;
+  block_input ();
   GetKeyNameText (keysym, value, 100);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return value;
 }
@@ -3308,7 +3308,7 @@ w32_mouse_position (FRAME_PTR *fp, int insist, Lisp_Object *bar_window,
 {
   FRAME_PTR f1;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (! NILP (last_mouse_scroll_bar) && insist == 0)
     x_scroll_bar_report_motion (fp, bar_window, part, x, y, time);
@@ -3382,7 +3382,7 @@ w32_mouse_position (FRAME_PTR *fp, int insist, Lisp_Object *bar_window,
       }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3480,12 +3480,12 @@ w32_set_scroll_bar_thumb (struct scroll_bar *bar,
   if (draggingp)
     {
       int near_bottom_p;
-      BLOCK_INPUT;
+      block_input ();
       si.cbSize = sizeof (si);
       si.fMask = SIF_POS | SIF_PAGE;
       GetScrollInfo (w, SB_CTL, &si);
       near_bottom_p = si.nPos + si.nPage >= range;
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (!near_bottom_p)
         return;
     }
@@ -3514,7 +3514,7 @@ w32_set_scroll_bar_thumb (struct scroll_bar *bar,
 
   sb_page = max (sb_page, VERTICAL_SCROLL_BAR_MIN_HANDLE);
 
-  BLOCK_INPUT;
+  block_input ();
 
   si.cbSize = sizeof (si);
   si.fMask = SIF_PAGE | SIF_POS;
@@ -3523,7 +3523,7 @@ w32_set_scroll_bar_thumb (struct scroll_bar *bar,
 
   SetScrollInfo (w, SB_CTL, &si, TRUE);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3614,7 +3614,7 @@ x_scroll_bar_create (struct window *w, int top, int left, int width, int height)
     = XSCROLL_BAR (Fmake_vector (make_number (SCROLL_BAR_VEC_SIZE), Qnil));
   Lisp_Object barobj;
 
-  BLOCK_INPUT;
+  block_input ();
 
   XSETWINDOW (bar->window, w);
   XSETINT (bar->top, top);
@@ -3650,7 +3650,7 @@ x_scroll_bar_create (struct window *w, int top, int left, int width, int height)
   if (! NILP (bar->next))
     XSETVECTOR (XSCROLL_BAR (bar->next)->prev, bar);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return bar;
 }
@@ -3664,7 +3664,7 @@ x_scroll_bar_remove (struct scroll_bar *bar)
 {
   FRAME_PTR f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Destroy the window.  */
   my_destroy_window (f, SCROLL_BAR_W32_WINDOW (bar));
@@ -3672,7 +3672,7 @@ x_scroll_bar_remove (struct scroll_bar *bar)
   /* Dissociate this scroll bar from its window.  */
   wset_vertical_scroll_bar (XWINDOW (bar->window), Qnil);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Set the handle of the vertical scroll bar for WINDOW to indicate
@@ -3727,7 +3727,7 @@ w32_set_vertical_scroll_bar (struct window *w,
   if (NILP (w->vertical_scroll_bar))
     {
       HDC hdc;
-      BLOCK_INPUT;
+      block_input ();
       if (width > 0 && height > 0)
         {
           hdc = get_frame_dc (f);
@@ -3737,7 +3737,7 @@ w32_set_vertical_scroll_bar (struct window *w,
             w32_clear_area (f, hdc, left, top, width, height);
           release_frame_dc (f, hdc);
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       bar = x_scroll_bar_create (w, top, sb_left, sb_width, height);
     }
@@ -3765,7 +3765,7 @@ w32_set_vertical_scroll_bar (struct window *w,
           HDC hdc;
           SCROLLINFO si;
 
-          BLOCK_INPUT;
+          block_input ();
           if (width && height)
             {
               hdc = get_frame_dc (f);
@@ -3801,7 +3801,7 @@ w32_set_vertical_scroll_bar (struct window *w,
           XSETINT (bar->width, sb_width);
           XSETINT (bar->height, height);
 
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
   bar->fringe_extended_p = fringe_extended_p ? Qt : Qnil;
@@ -4043,7 +4043,7 @@ x_scroll_bar_report_motion (FRAME_PTR *fp, Lisp_Object *bar_window,
   int top_range = VERTICAL_SCROLL_BAR_TOP_RANGE (f, XINT (bar->height));
   SCROLLINFO si;
 
-  BLOCK_INPUT;
+  block_input ();
 
   *fp = f;
   *bar_window = bar->window;
@@ -4080,7 +4080,7 @@ x_scroll_bar_report_motion (FRAME_PTR *fp, Lisp_Object *bar_window,
 
   *time = last_mouse_movement_time;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -4157,15 +4157,7 @@ w32_read_socket (struct terminal *terminal,
   struct w32_display_info *dpyinfo = &one_w32_display_info;
   Mouse_HLInfo *hlinfo = &dpyinfo->mouse_highlight;
 
-  if (interrupt_input_blocked)
-    {
-      interrupt_input_pending = 1;
-      pending_signals = 1;
-      return -1;
-    }
-
-  interrupt_input_pending = 0;
-  BLOCK_INPUT;
+  block_input ();
 
   /* So people can tell when we have read the available input.  */
   input_signal_count++;
@@ -4961,7 +4953,7 @@ w32_read_socket (struct terminal *terminal,
       }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return count;
 }
 
@@ -5476,7 +5468,7 @@ x_set_offset (struct frame *f, register int xoff, register int yoff,
     }
   x_calc_absolute_position (f);
 
-  BLOCK_INPUT;
+  block_input ();
   x_wm_set_size_hint (f, (long) 0, 0);
 
   modified_left = f->left_pos;
@@ -5487,7 +5479,7 @@ x_set_offset (struct frame *f, register int xoff, register int yoff,
                      modified_left, modified_top,
                      0, 0,
                      SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5528,7 +5520,7 @@ x_set_window_size (struct frame *f, int change_gravity, int cols, int rows)
 {
   int pixelwidth, pixelheight;
 
-  BLOCK_INPUT;
+  block_input ();
 
   check_frame_size (f, &rows, &cols);
   f->scroll_bar_actual_width
@@ -5608,7 +5600,7 @@ x_set_window_size (struct frame *f, int change_gravity, int cols, int rows)
   cancel_mouse_face (f);
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Mouse warping.  */
@@ -5638,7 +5630,7 @@ x_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
   RECT rect;
   POINT pt;
 
-  BLOCK_INPUT;
+  block_input ();
 
   GetClientRect (FRAME_W32_WINDOW (f), &rect);
   pt.x = rect.left + pix_x;
@@ -5647,7 +5639,7 @@ x_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
 
   SetCursorPos (pt.x, pt.y);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5659,7 +5651,7 @@ x_focus_on_frame (struct frame *f)
   struct w32_display_info *dpyinfo = &one_w32_display_info;
 
   /* Give input focus to frame.  */
-  BLOCK_INPUT;
+  block_input ();
 #if 0
   /* Try not to change its Z-order if possible.  */
   if (x_window_to_frame (dpyinfo, GetForegroundWindow ()))
@@ -5667,7 +5659,7 @@ x_focus_on_frame (struct frame *f)
   else
 #endif
     my_set_foreground_window (FRAME_W32_WINDOW (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 void
@@ -5679,7 +5671,7 @@ x_unfocus_frame (struct frame *f)
 void
 x_raise_frame (struct frame *f)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   /* Strictly speaking, raise-frame should only change the frame's Z
      order, leaving input focus unchanged.  This is reasonable behavior
@@ -5734,19 +5726,19 @@ x_raise_frame (struct frame *f)
       my_bring_window_to_top (FRAME_W32_WINDOW (f));
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Lower frame F.  */
 void
 x_lower_frame (struct frame *f)
 {
-  BLOCK_INPUT;
+  block_input ();
   my_set_window_pos (FRAME_W32_WINDOW (f),
                      HWND_BOTTOM,
                      0, 0, 0, 0,
                      SWP_NOSIZE | SWP_NOMOVE | SWP_NOACTIVATE);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static void
@@ -5775,7 +5767,7 @@ x_make_frame_visible (struct frame *f)
 {
   Lisp_Object type;
 
-  BLOCK_INPUT;
+  block_input ();
 
   type = x_icon_type (f);
   if (!NILP (type))
@@ -5827,7 +5819,7 @@ x_make_frame_visible (struct frame *f)
     int count;
 
     /* This must come after we set COUNT.  */
-    UNBLOCK_INPUT;
+    unblock_input ();
 
     XSETFRAME (frame, f);
 
@@ -5870,7 +5862,7 @@ x_make_frame_invisible (struct frame *f)
   if (FRAME_W32_DISPLAY_INFO (f)->x_highlight_frame == f)
     FRAME_W32_DISPLAY_INFO (f)->x_highlight_frame = 0;
 
-  BLOCK_INPUT;
+  block_input ();
 
   my_show_window (f, FRAME_W32_WINDOW (f), SW_HIDE);
 
@@ -5884,7 +5876,7 @@ x_make_frame_invisible (struct frame *f)
   f->async_visible = 0;
   f->async_iconified = 0;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Change window state from mapped to iconified. */
@@ -5901,7 +5893,7 @@ x_iconify_frame (struct frame *f)
   if (f->async_iconified)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   type = x_icon_type (f);
   if (!NILP (type))
@@ -5910,7 +5902,7 @@ x_iconify_frame (struct frame *f)
   /* Simulate the user minimizing the frame.  */
   SendMessage (FRAME_W32_WINDOW (f), WM_SYSCOMMAND, SC_MINIMIZE, 0);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5922,7 +5914,7 @@ x_free_frame_resources (struct frame *f)
   struct w32_display_info *dpyinfo = FRAME_W32_DISPLAY_INFO (f);
   Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* We must free faces before destroying windows because some
      font-driver (e.g. xft) access a window while finishing a
@@ -5970,7 +5962,7 @@ x_free_frame_resources (struct frame *f)
       hlinfo->mouse_face_mouse_frame = 0;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5990,10 +5982,10 @@ x_destroy_window (struct frame *f)
 /* Set the normal size hints for the window manager, for frame F.
    FLAGS is the flags word to use--or 0 meaning preserve the flags
    that the window now has.
-   If USER_POSITION is nonzero, we set the USPosition
+   If USER_POSITION, set the USPosition
    flag (this is useful when FLAGS is 0).  */
 void
-x_wm_set_size_hint (struct frame *f, long flags, int user_position)
+x_wm_set_size_hint (struct frame *f, long flags, bool user_position)
 {
   Window window = FRAME_W32_WINDOW (f);
 
@@ -6254,10 +6246,10 @@ x_delete_terminal (struct terminal *terminal)
   if (!terminal->name)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x_delete_display (dpyinfo);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 struct w32_display_info *
@@ -6267,7 +6259,7 @@ w32_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
   struct terminal *terminal;
   HDC hdc;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!w32_initialized)
     {
@@ -6329,7 +6321,7 @@ w32_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
     init_sigio (connection);
 #endif /* ! defined (SIGIO) */
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return dpyinfo;
 }
diff --git a/src/widget.c b/src/widget.c
index fd5ad167125..1f472c6231c 100644
--- a/src/widget.c
+++ b/src/widget.c
@@ -677,13 +677,13 @@ EmacsFrameDestroy (Widget widget)
   if (! s) emacs_abort ();
   if (! s->output_data.x) emacs_abort ();
 
-  BLOCK_INPUT;
+  block_input ();
   x_free_gcs (s);
   if (s->output_data.x->white_relief.gc)
     XFreeGC (XtDisplay (widget), s->output_data.x->white_relief.gc);
   if (s->output_data.x->black_relief.gc)
     XFreeGC (XtDisplay (widget), s->output_data.x->black_relief.gc);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static void
diff --git a/src/window.c b/src/window.c
index 6798be8231c..bb3b73f9acd 100644
--- a/src/window.c
+++ b/src/window.c
@@ -60,7 +60,7 @@ static Lisp_Object Qwindow_deletable_p, Qdelete_window, Qdisplay_buffer;
 static Lisp_Object Qreplace_buffer_in_windows, Qget_mru_window;
 static Lisp_Object Qwindow_resize_root_window, Qwindow_resize_root_window_vertically;
 static Lisp_Object Qscroll_up, Qscroll_down, Qscroll_command;
-static Lisp_Object Qsafe, Qabove, Qbelow, Qtemp_buffer_resize, Qclone_of;
+static Lisp_Object Qsafe, Qabove, Qbelow, Qwindow_size, Qclone_of;
 
 static int displayed_window_lines (struct window *);
 static int count_windows (struct window *);
@@ -2819,7 +2819,7 @@ window-start value is reasonable when this function is called.  */)
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
   if (!FRAME_INITIAL_P (f))
     {
         Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
@@ -2961,7 +2961,7 @@ window-start value is reasonable when this function is called.  */)
     }
 
   adjust_glyphs (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   run_window_configuration_change_hook (f);
 
@@ -3696,14 +3696,14 @@ be applied on the Elisp level.  */)
                (horflag ? r->total_cols : r->total_lines)))
     return Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
   window_resize_apply (r, horflag);
 
   windows_or_buffers_changed++;
   FRAME_WINDOW_SIZES_CHANGED (f) = 1;
 
   adjust_glyphs (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   run_window_configuration_change_hook (f);
 
@@ -3973,13 +3973,13 @@ set correctly.  See the code of `split-window' for how this is done.  */)
   wset_new_total (n, total_size);
   wset_new_normal (n, normal_size);
 
-  BLOCK_INPUT;
+  block_input ();
   window_resize_apply (p, horflag);
   adjust_glyphs (f);
   /* Set buffer of NEW to buffer of reference window.  Don't run
      any hooks.  */
   set_window_buffer (new, r->buffer, 0, 1);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Maybe we should run the scroll functions in Elisp (which already
      runs the configuration change hook).  */
@@ -4060,7 +4060,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
     {
 
       /* Block input.  */
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (p, horflag);
 
       /* If this window is referred to by the dpyinfo's mouse
@@ -4132,7 +4132,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
           else
             fset_selected_window (f, new_selected_window);
 
-          UNBLOCK_INPUT;
+          unblock_input ();
 
           /* Now look whether `get-mru-window' gets us something.  */
           mru_window = call1 (Qget_mru_window, frame);
@@ -4147,7 +4147,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
             fset_selected_window (f, new_selected_window);
         }
       else
-        UNBLOCK_INPUT;
+        unblock_input ();
 
       /* Must be run by the caller:
          run_window_configuration_change_hook (f);  */
@@ -4197,7 +4197,7 @@ grow_mini_window (struct window *w, int delta)
                  root, make_number (- delta));
   if (INTEGERP (value) && window_resize_check (r, 0))
     {
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (r, 0);
 
       /* Grow the mini-window.  */
@@ -4209,7 +4209,7 @@ grow_mini_window (struct window *w, int delta)
       w->last_overlay_modified = 0;
 
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -4234,7 +4234,7 @@ shrink_mini_window (struct window *w)
                      root, make_number (size - 1));
       if (INTEGERP (value) && window_resize_check (r, 0))
         {
-          BLOCK_INPUT;
+          block_input ();
           window_resize_apply (r, 0);
 
           /* Shrink the mini-window.  */
@@ -4246,7 +4246,7 @@ shrink_mini_window (struct window *w)
           w->last_overlay_modified = 0;
 
           adjust_glyphs (f);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
       /* If the above failed for whatever strange reason we must make a
          one window frame here.  The same routine will be needed when
@@ -4278,7 +4278,7 @@ DEFUN ("resize-mini-window-internal", Fresize_mini_window_internal, Sresize_mini
       && XINT (w->new_total) > 0
       && height == XINT (r->new_total) + XINT (w->new_total))
     {
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (r, 0);
 
       wset_total_lines (w, w->new_total);
@@ -4288,7 +4288,7 @@ DEFUN ("resize-mini-window-internal", Fresize_mini_window_internal, Sresize_mini
       windows_or_buffers_changed++;
       FRAME_WINDOW_SIZES_CHANGED (f) = 1;
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       run_window_configuration_change_hook (f);
       return Qt;
@@ -5624,7 +5624,7 @@ the return value is nil.  Otherwise the value is t.  */)
 
       /* The mouse highlighting code could get screwed up
          if it runs during this.  */
-      BLOCK_INPUT;
+      block_input ();
 
       if (data->frame_lines != previous_frame_lines
           || data->frame_cols != previous_frame_cols)
@@ -5875,7 +5875,7 @@ the return value is nil.  Otherwise the value is t.  */)
         }
 
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       /* Scan dead buffer windows.  */
       for (; CONSP (dead_windows); dead_windows = XCDR (dead_windows))
@@ -6704,7 +6704,7 @@ syms_of_window (void)
   DEFSYM (Qreplace_buffer_in_windows, "replace-buffer-in-windows");
   DEFSYM (Qrecord_window_buffer, "record-window-buffer");
   DEFSYM (Qget_mru_window, "get-mru-window");
-  DEFSYM (Qtemp_buffer_resize, "temp-buffer-resize");
+  DEFSYM (Qwindow_size, "window-size");
   DEFSYM (Qtemp_buffer_show_hook, "temp-buffer-show-hook");
   DEFSYM (Qabove, "above");
   DEFSYM (Qbelow, "below");
@@ -6804,19 +6804,19 @@ This variable takes no effect if `window-combination-limit' is non-nil.  */);
 The following values are recognized:
 
 nil means splitting a window will create a new parent window only if the
-    window has no parent window or the window shall become a combination
-    orthogonal to the one it is part of.
+    window has no parent window or the window shall become part of a
+    combination orthogonal to the one it is part of.
 
-`temp-buffer-resize' means that splitting a window for displaying a
-    temporary buffer makes a new parent window provided
-    `temp-buffer-resize-mode' is enabled.  Otherwise, this value is
-    handled like nil.
+`window-size' means that splitting a window for displaying a buffer
+    makes a new parent window provided `display-buffer' is supposed to
+    explicitly set the window's size due to the presence of a
+    `window-height' or `window-width' entry in the alist used by
+    `display-buffer'.  Otherwise, this value is handled like nil.
 
 `temp-buffer' means that splitting a window for displaying a temporary
     buffer always makes a new parent window.  Otherwise, this value is
     handled like nil.
 
-
 `display-buffer' means that splitting a window for displaying a buffer
     always makes a new parent window.  Since temporary buffers are
     displayed by the function `display-buffer', this value is stronger
@@ -6829,7 +6829,7 @@ t means that splitting a window always creates a new parent window.  If
     sibling.
 
 Other values are reserved for future use.  */);
-  Vwindow_combination_limit = Qtemp_buffer_resize;
+  Vwindow_combination_limit = Qwindow_size;
 
   DEFVAR_LISP ("window-persistent-parameters", Vwindow_persistent_parameters,
                doc: /* Alist of persistent window parameters.
diff --git a/src/xdisp.c b/src/xdisp.c
index c2032696a1c..b23a06ff3d1 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -275,6 +275,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <limits.h>
 
 #include "lisp.h"
+#include "atimer.h"
 #include "keyboard.h"
 #include "frame.h"
 #include "window.h"
@@ -332,10 +333,10 @@ static Lisp_Object Qinhibit_eval_during_redisplay;
 static Lisp_Object Qbuffer_position, Qposition, Qobject;
 static Lisp_Object Qright_to_left, Qleft_to_right;
 
-/* Cursor shapes */
+/* Cursor shapes.  */
 Lisp_Object Qbar, Qhbar, Qbox, Qhollow;
 
-/* Pointer shapes */
+/* Pointer shapes.  */
 static Lisp_Object Qarrow, Qhand;
 Lisp_Object Qtext;
 
@@ -346,6 +347,7 @@ static Lisp_Object Qfontification_functions;
 
 static Lisp_Object Qwrap_prefix;
 static Lisp_Object Qline_prefix;
+static Lisp_Object Qredisplay_internal;
 
 /* Non-nil means don't actually do any redisplay.  */
 
@@ -11402,11 +11404,11 @@ x_cursor_to (int vpos, int hpos, int y, int x)
      This will also set the cursor position of W.  */
   if (updated_window == NULL)
     {
-      BLOCK_INPUT;
+      block_input ();
       display_and_set_cursor (w, 1, hpos, vpos, x, y);
       if (FRAME_RIF (SELECTED_FRAME ())->flush_display_optional)
         FRAME_RIF (SELECTED_FRAME ())->flush_display_optional (SELECTED_FRAME ());
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -11520,11 +11522,11 @@ update_tool_bar (struct frame *f, int save_match_data)
               /* Redisplay that happens asynchronously due to an expose event
                  may access f->tool_bar_items.  Make sure we update both
                  variables within BLOCK_INPUT so no such event interrupts.  */
-              BLOCK_INPUT;
+              block_input ();
               fset_tool_bar_items (f, new_tool_bar);
               f->n_tool_bar_items = new_n_tool_bar;
               w->update_mode_line = 1;
-              UNBLOCK_INPUT;
+              unblock_input ();
             }
 
           UNGCPRO;
@@ -12928,12 +12930,13 @@ redisplay_internal (void)
   struct frame *sf;
   int polling_stopped_here = 0;
   Lisp_Object old_frame = selected_frame;
+  struct backtrace backtrace;
 
   /* Non-zero means redisplay has to consider all windows on all
      frames.  Zero means, only selected_window is considered.  */
   int consider_all_windows_p;
 
-  /* Non-zero means redisplay has to redisplay the miniwindow */
+  /* Non-zero means redisplay has to redisplay the miniwindow.  */
   int update_miniwindow_p = 0;
 
   TRACE ((stderr, "redisplay_internal %d\n", redisplaying_p));
@@ -12970,6 +12973,14 @@ redisplay_internal (void)
   redisplaying_p = 1;
   specbind (Qinhibit_free_realized_faces, Qnil);
 
+  /* Record this function, so it appears on the profiler's backtraces.  */
+  backtrace.next = backtrace_list;
+  backtrace.function = Qredisplay_internal;
+  backtrace.args = &Qnil;
+  backtrace.nargs = 0;
+  backtrace.debug_on_exit = 0;
+  backtrace_list = &backtrace;
+
   {
     Lisp_Object tail, frame;
 
@@ -13667,6 +13678,7 @@ redisplay_internal (void)
 #endif /* HAVE_WINDOW_SYSTEM */
 
  end_of_redisplay:
+  backtrace_list = backtrace.next;
   unbind_to (count, Qnil);
   RESUME_POLLING;
 }
@@ -16205,10 +16217,10 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
                                     || w->pseudo_window_p)))
     {
       update_begin (f);
-      BLOCK_INPUT;
+      block_input ();
       if (draw_window_fringes (w, 1))
         x_draw_vertical_border (w);
-      UNBLOCK_INPUT;
+      unblock_input ();
       update_end (f);
     }
 #endif /* HAVE_WINDOW_SYSTEM */
@@ -20161,10 +20173,6 @@ display_menu_bar (struct window *w)
      this.  */
   it.paragraph_embedding = L2R;
 
-  if (! mode_line_inverse_video)
-    /* Force the menu-bar to be displayed in the default face.  */
-    it.base_face_id = it.face_id = DEFAULT_FACE_ID;
-
   /* Clear all rows of the menu bar.  */
   for (i = 0; i < FRAME_MENU_BAR_LINES (f); ++i)
     {
@@ -20334,10 +20342,6 @@ display_mode_line (struct window *w, enum face_id face_id, Lisp_Object format)
 
   it.glyph_row->mode_line_p = 1;
 
-  if (! mode_line_inverse_video)
-    /* Force the mode-line to be displayed in the default face.  */
-    it.base_face_id = it.face_id = DEFAULT_FACE_ID;
-
   /* FIXME: This should be controlled by a user option.  But
      supporting such an option is not trivial, since the mode line is
      made up of many separate strings.  */
@@ -25327,7 +25331,7 @@ x_write_glyphs (struct glyph *start, int len)
   if (updated_row->reversed_p && chpos >= updated_row->used[TEXT_AREA])
     chpos = updated_row->used[TEXT_AREA] - 1;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Write glyphs.  */
 
@@ -25345,7 +25349,7 @@ x_write_glyphs (struct glyph *start, int len)
       && chpos < hpos + len)
     updated_window->phys_cursor_on_p = 0;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Advance the output cursor.  */
   output_cursor.hpos += len;
@@ -25368,7 +25372,7 @@ x_insert_glyphs (struct glyph *start, int len)
   ptrdiff_t hpos;
 
   eassert (updated_window && updated_row);
-  BLOCK_INPUT;
+  block_input ();
   w = updated_window;
   f = XFRAME (WINDOW_FRAME (w));
 
@@ -25402,7 +25406,7 @@ x_insert_glyphs (struct glyph *start, int len)
   /* Advance the output cursor.  */
   output_cursor.hpos += len;
   output_cursor.x += shift_by_width;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -25471,10 +25475,10 @@ x_clear_end_of_line (int to_x)
   /* Prevent inadvertently clearing to end of the X window.  */
   if (to_x > from_x && to_y > from_y)
     {
-      BLOCK_INPUT;
+      block_input ();
       FRAME_RIF (f)->clear_frame_area (f, from_x, from_y,
                                        to_x - from_x, to_y - from_y);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -25801,7 +25805,7 @@ x_fix_overlapping_area (struct window *w, struct glyph_row *row,
 {
   int i, x;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x = 0;
   for (i = 0; i < row->used[area];)
@@ -25829,7 +25833,7 @@ x_fix_overlapping_area (struct window *w, struct glyph_row *row,
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -26047,7 +26051,7 @@ display_and_set_cursor (struct window *w, int on,
       || (0 <= hpos && hpos < glyph_row->used[TEXT_AREA]))
     glyph = glyph_row->glyphs[TEXT_AREA] + hpos;
 
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
 
   /* Set new_cursor_type to the cursor we want to be displayed.  */
   new_cursor_type = get_window_cursor_type (w, glyph,
@@ -26117,10 +26121,10 @@ update_window_cursor (struct window *w, int on)
       if (row->reversed_p && hpos >= row->used[TEXT_AREA])
         hpos = row->used[TEXT_AREA] - 1;
 
-      BLOCK_INPUT;
+      block_input ();
       display_and_set_cursor (w, on, hpos, vpos,
                               w->phys_cursor.x, w->phys_cursor.y);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -26298,10 +26302,10 @@ show_mouse_face (Mouse_HLInfo *hlinfo, enum draw_glyphs_face draw)
           if (row->reversed_p && hpos >= row->used[TEXT_AREA])
             hpos = row->used[TEXT_AREA] - 1;
 
-          BLOCK_INPUT;
+          block_input ();
           display_and_set_cursor (w, 1, hpos, w->phys_cursor.vpos,
                                   w->phys_cursor.x, w->phys_cursor.y);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 #endif  /* HAVE_WINDOW_SYSTEM */
     }
@@ -28116,11 +28120,11 @@ x_clear_window_mouse_face (struct window *w)
   Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (XFRAME (w->frame));
   Lisp_Object window;
 
-  BLOCK_INPUT;
+  block_input ();
   XSETWINDOW (window, w);
   if (EQ (window, hlinfo->mouse_face_window))
     clear_mouse_face (hlinfo);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -28690,6 +28694,7 @@ syms_of_xdisp (void)
   staticpro (&Vmessage_stack);
 
   DEFSYM (Qinhibit_redisplay, "inhibit-redisplay");
+  DEFSYM (Qredisplay_internal, "redisplay_internal (C function)");
 
   message_dolog_marker1 = Fmake_marker ();
   staticpro (&message_dolog_marker1);
@@ -28929,12 +28934,6 @@ A value of nil means to respect the value of `truncate-lines'.
 If `word-wrap' is enabled, you might want to reduce this.  */);
   Vtruncate_partial_width_windows = make_number (50);
 
-  DEFVAR_BOOL ("mode-line-inverse-video", mode_line_inverse_video,
-    doc: /* When nil, display the mode-line/header-line/menu-bar in the default face.
-Any other value means to use the appropriate face, `mode-line',
-`header-line', or `menu' respectively.  */);
-  mode_line_inverse_video = 1;
-
   DEFVAR_LISP ("line-number-display-limit", Vline_number_display_limit,
     doc: /* Maximum buffer size for which line number should be displayed.
 If the buffer is bigger than this, the line number does not appear
@@ -29362,7 +29361,7 @@ init_xdisp (void)
    the following three functions in w32fns.c.  */
 #ifndef WINDOWSNT
 
-/* Platform-independent portion of hourglass implementation. */
+/* Platform-independent portion of hourglass implementation.  */
 
 /* Cancel a currently active hourglass timer, and start a new one.  */
 void
diff --git a/src/xfaces.c b/src/xfaces.c
index c240a05c6c0..28be6aaf082 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -605,9 +605,9 @@ static inline GC
 x_create_gc (struct frame *f, long unsigned int mask, XGCValues *xgcv)
 {
   GC gc;
-  BLOCK_INPUT;
+  block_input ();
   gc = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), mask, xgcv);
-  UNBLOCK_INPUT;
+  unblock_input ();
   IF_DEBUG (++ngcs);
   return gc;
 }
@@ -618,7 +618,7 @@ x_create_gc (struct frame *f, long unsigned int mask, XGCValues *xgcv)
 static inline void
 x_free_gc (struct frame *f, GC gc)
 {
-  eassert (interrupt_input_blocked);
+  eassert (input_blocked_p ());
   IF_DEBUG (eassert (--ngcs >= 0));
   XFreeGC (FRAME_X_DISPLAY (f), gc);
 }
@@ -632,9 +632,9 @@ static inline GC
 x_create_gc (struct frame *f, unsigned long mask, XGCValues *xgcv)
 {
   GC gc;
-  BLOCK_INPUT;
+  block_input ();
   gc = XCreateGC (NULL, FRAME_W32_WINDOW (f), mask, xgcv);
-  UNBLOCK_INPUT;
+  unblock_input ();
   IF_DEBUG (++ngcs);
   return gc;
 }
@@ -907,7 +907,7 @@ load_pixmap (FRAME_PTR f, Lisp_Object name, unsigned int *w_ptr,
 
   CHECK_TYPE (!NILP (Fbitmap_spec_p (name)), Qbitmap_spec_p, name);
 
-  BLOCK_INPUT;
+  block_input ();
   if (CONSP (name))
     {
       /* Decode a bitmap spec into a bitmap.  */
@@ -927,7 +927,7 @@ load_pixmap (FRAME_PTR f, Lisp_Object name, unsigned int *w_ptr,
       /* It must be a string -- a file name.  */
       bitmap_id = x_create_bitmap_from_file (f, name);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (bitmap_id < 0)
     {
@@ -991,7 +991,7 @@ parse_rgb_list (Lisp_Object rgb_list, XColor *color)
    non-zero, then the `standard' definition of the same color is
    returned in it.  */
 
-static int
+static bool
 tty_lookup_color (struct frame *f, Lisp_Object color, XColor *tty_color,
                   XColor *std_color)
 {
@@ -1052,11 +1052,11 @@ tty_lookup_color (struct frame *f, Lisp_Object color, XColor *tty_color,
 
 /* A version of defined_color for non-X frames.  */
 
-static int
+static bool
 tty_defined_color (struct frame *f, const char *color_name,
-                   XColor *color_def, int alloc)
+                   XColor *color_def, bool alloc)
 {
-  int status = 1;
+  bool status = 1;
 
   /* Defaults.  */
   color_def->pixel = FACE_TTY_DEFAULT_COLOR;
@@ -1084,13 +1084,13 @@ tty_defined_color (struct frame *f, const char *color_name,
 
 /* Decide if color named COLOR_NAME is valid for the display
    associated with the frame F; if so, return the rgb values in
-   COLOR_DEF.  If ALLOC is nonzero, allocate a new colormap cell.
+   COLOR_DEF.  If ALLOC, allocate a new colormap cell.
 
    This does the right thing for any type of frame.  */
 
-static int
+static bool
 defined_color (struct frame *f, const char *color_name, XColor *color_def,
-               int alloc)
+               bool alloc)
 {
   if (!FRAME_WINDOW_P (f))
     return tty_defined_color (f, color_name, color_def, alloc);
@@ -1364,9 +1364,9 @@ unload_color (struct frame *f, long unsigned int pixel)
 #ifdef HAVE_X_WINDOWS
   if (pixel != -1)
     {
-      BLOCK_INPUT;
+      block_input ();
       x_free_colors (f, &pixel, 1);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif
 }
@@ -1382,7 +1382,7 @@ free_face_colors (struct frame *f, struct face *face)
   if (face->colors_copied_bitwise_p)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!face->foreground_defaulted_p)
     {
@@ -1424,7 +1424,7 @@ free_face_colors (struct frame *f, struct face *face)
       IF_DEBUG (--ncolors_allocated);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif /* HAVE_X_WINDOWS */
 }
 
@@ -3438,10 +3438,10 @@ DEFUN ("internal-face-x-get-resource", Finternal_face_x_get_resource,
   CHECK_STRING (resource);
   CHECK_STRING (class);
   CHECK_LIVE_FRAME (frame);
-  BLOCK_INPUT;
+  block_input ();
   value = display_x_get_resource (FRAME_X_DISPLAY_INFO (XFRAME (frame)),
                                   resource, class, Qnil, Qnil);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return value;
 }
 
@@ -4114,12 +4114,12 @@ free_realized_face (struct frame *f, struct face *face)
             free_face_fontset (f, face);
           if (face->gc)
             {
-              BLOCK_INPUT;
+              block_input ();
               if (face->font)
                 font_done_for_face (f, face);
               x_free_gc (f, face->gc);
               face->gc = 0;
-              UNBLOCK_INPUT;
+              unblock_input ();
             }
 
           free_face_colors (f, face);
@@ -4153,7 +4153,7 @@ prepare_face_for_display (struct frame *f, struct face *face)
       xgcv.graphics_exposures = False;
 #endif
 
-      BLOCK_INPUT;
+      block_input ();
 #ifdef HAVE_X_WINDOWS
       if (face->stipple)
         {
@@ -4165,7 +4165,7 @@ prepare_face_for_display (struct frame *f, struct face *face)
       face->gc = x_create_gc (f, mask, &xgcv);
       if (face->font)
         font_prepare_for_face (f, face);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif /* HAVE_WINDOW_SYSTEM */
 }
@@ -4263,12 +4263,12 @@ clear_face_gcs (struct face_cache *c)
           struct face *face = c->faces_by_id[i];
           if (face && face->gc)
             {
-              BLOCK_INPUT;
+              block_input ();
               if (face->font)
                 font_done_for_face (c->f, face);
               x_free_gc (c->f, face->gc);
               face->gc = 0;
-              UNBLOCK_INPUT;
+              unblock_input ();
             }
         }
 #endif /* HAVE_WINDOW_SYSTEM */
@@ -4292,7 +4292,7 @@ free_realized_faces (struct face_cache *c)
       /* We must block input here because we can't process X events
          safely while only some faces are freed, or when the frame's
          current matrix still references freed faces.  */
-      BLOCK_INPUT;
+      block_input ();
 
       for (i = 0; i < c->used; ++i)
         {
@@ -4314,7 +4314,7 @@ free_realized_faces (struct face_cache *c)
           ++windows_or_buffers_changed;
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -5275,7 +5275,7 @@ realize_basic_faces (struct frame *f)
 
   /* Block input here so that we won't be surprised by an X expose
      event, for instance, without having the faces set up.  */
-  BLOCK_INPUT;
+  block_input ();
   specbind (Qscalable_fonts_allowed, Qt);
 
   if (realize_default_face (f))
@@ -5306,7 +5306,7 @@ realize_basic_faces (struct frame *f)
     }
 
   unbind_to (count, Qnil);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return success_p;
 }
 
@@ -6352,7 +6352,7 @@ where R,G,B are numbers between 0 and 255 and name is an arbitrary string.  */)
       int red, green, blue;
       int num;
 
-      BLOCK_INPUT;
+      block_input ();
 
       while (fgets (buf, sizeof (buf), fp) != NULL) {
         if (sscanf (buf, "%u %u %u %n", &red, &green, &blue, &num) == 3)
@@ -6372,7 +6372,7 @@ where R,G,B are numbers between 0 and 255 and name is an arbitrary string.  */)
       }
       fclose (fp);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   return cmap;
diff --git a/src/xfns.c b/src/xfns.c
index 8304a3df04f..928e6367743 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -425,7 +425,7 @@ x_real_positions (FRAME_PTR f, int *xptr, int *yptr)
   unsigned char *tmp_data = NULL;
   Atom target_type = XA_CARDINAL;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x_catch_errors (dpy);
 
@@ -543,7 +543,7 @@ x_real_positions (FRAME_PTR f, int *xptr, int *yptr)
 
   x_uncatch_errors ();
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (had_errors) return;
 
@@ -575,27 +575,27 @@ gamma_correct (struct frame *f, XColor *color)
 
 
 /* Decide if color named COLOR_NAME is valid for use on frame F.  If
-   so, return the RGB values in COLOR.  If ALLOC_P is non-zero,
-   allocate the color.  Value is zero if COLOR_NAME is invalid, or
+   so, return the RGB values in COLOR.  If ALLOC_P,
+   allocate the color.  Value is false if COLOR_NAME is invalid, or
    no color could be allocated.  */
 
-int
+bool
 x_defined_color (struct frame *f, const char *color_name,
-                 XColor *color, int alloc_p)
+                 XColor *color, bool alloc_p)
 {
-  int success_p = 0;
+  bool success_p = 0;
   Display *dpy = FRAME_X_DISPLAY (f);
   Colormap cmap = FRAME_X_COLORMAP (f);
 
-  BLOCK_INPUT;
+  block_input ();
 #ifdef USE_GTK
   success_p = xg_check_special_colors (f, color_name, color);
 #endif
   if (!success_p)
-    success_p = XParseColor (dpy, cmap, color_name, color);
+    success_p = XParseColor (dpy, cmap, color_name, color) != 0;
   if (success_p && alloc_p)
     success_p = x_alloc_nearest_color (f, cmap, color);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return success_p;
 }
@@ -656,8 +656,8 @@ x_set_tool_bar_position (struct frame *f,
   if (EQ (new_value, old_value)) return;
 
 #ifdef USE_GTK
-  if (xg_change_toolbar_position (f, new_value))
-    fset_tool_bar_position (f, new_value);
+  xg_change_toolbar_position (f, new_value);
+  fset_tool_bar_position (f, new_value);
 #endif
 }
 
@@ -679,7 +679,7 @@ xg_set_icon (FRAME_PTR f, Lisp_Object file)
       GdkPixbuf *pixbuf;
       GError *err = NULL;
       char *filename = SSDATA (found);
-      BLOCK_INPUT;
+      block_input ();
 
       pixbuf = gdk_pixbuf_new_from_file (filename, &err);
 
@@ -694,7 +694,7 @@ xg_set_icon (FRAME_PTR f, Lisp_Object file)
       else
         g_error_free (err);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   return result;
@@ -737,7 +737,7 @@ x_set_foreground_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     {
       Display *dpy = FRAME_X_DISPLAY (f);
 
-      BLOCK_INPUT;
+      block_input ();
       XSetForeground (dpy, x->normal_gc, fg);
       XSetBackground (dpy, x->reverse_gc, fg);
 
@@ -748,7 +748,7 @@ x_set_foreground_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
           XSetBackground (dpy, x->cursor_gc, x->cursor_pixel);
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       update_face_from_frame_parameter (f, Qforeground_color, arg);
 
@@ -773,7 +773,7 @@ x_set_background_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
     {
       Display *dpy = FRAME_X_DISPLAY (f);
 
-      BLOCK_INPUT;
+      block_input ();
       XSetBackground (dpy, x->normal_gc, bg);
       XSetForeground (dpy, x->reverse_gc, bg);
       XSetWindowBackground (dpy, FRAME_X_WINDOW (f), bg);
@@ -797,7 +797,7 @@ x_set_background_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
       }
 #endif /* USE_TOOLKIT_SCROLL_BARS */
 
-      UNBLOCK_INPUT;
+      unblock_input ();
       update_face_from_frame_parameter (f, Qbackground_color, arg);
 
       if (FRAME_VISIBLE_P (f))
@@ -854,7 +854,7 @@ x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   unload_color (f, x->mouse_pixel);
   x->mouse_pixel = pixel;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* It's not okay to crash if the user selects a screwy cursor.  */
   x_catch_errors (dpy);
@@ -974,7 +974,7 @@ x_set_mouse_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   x->horizontal_drag_cursor = horizontal_drag_cursor;
 
   XFlush (dpy);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   update_face_from_frame_parameter (f, Qmouse_color, arg);
 }
@@ -1031,10 +1031,10 @@ x_set_cursor_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 
   if (FRAME_X_WINDOW (f) != 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       XSetBackground (FRAME_X_DISPLAY (f), x->cursor_gc, x->cursor_pixel);
       XSetForeground (FRAME_X_DISPLAY (f), x->cursor_gc, fore_pixel);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       if (FRAME_VISIBLE_P (f))
         {
@@ -1058,9 +1058,9 @@ x_set_border_pixel (struct frame *f, int pix)
 
   if (FRAME_X_WINDOW (f) != 0 && f->border_width > 0)
     {
-      BLOCK_INPUT;
+      block_input ();
       XSetWindowBorder (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), pix);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       if (FRAME_VISIBLE_P (f))
         redraw_frame (f);
@@ -1112,7 +1112,7 @@ x_set_icon_type (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   else if (!STRINGP (oldval) && EQ (oldval, Qnil) == EQ (arg, Qnil))
     return;
 
-  BLOCK_INPUT;
+  block_input ();
   if (NILP (arg))
     result = x_text_icon (f,
                           SSDATA ((!NILP (f->icon_name)
@@ -1123,12 +1123,12 @@ x_set_icon_type (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 
   if (result)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       error ("No icon window available");
     }
 
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static void
@@ -1149,7 +1149,7 @@ x_set_icon_name (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
   if (f->output_data.x->icon_bitmap != 0)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   result = x_text_icon (f,
                         SSDATA ((!NILP (f->icon_name)
@@ -1160,12 +1160,12 @@ x_set_icon_name (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 
   if (result)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       error ("No icon window available");
     }
 
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -1228,10 +1228,10 @@ x_set_menu_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
         {
           y = FRAME_TOP_MARGIN_HEIGHT (f);
 
-          BLOCK_INPUT;
+          block_input ();
           x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                         0, y, width, height, False);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 
       if (nlines > 1 && nlines > olines)
@@ -1239,10 +1239,10 @@ x_set_menu_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
           y = (olines == 0 ? 1 : olines) * FRAME_LINE_HEIGHT (f);
           height = nlines * FRAME_LINE_HEIGHT (f) - y;
 
-          BLOCK_INPUT;
+          block_input ();
           x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                         0, y, width, height, False);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 
       if (nlines == 0 && WINDOWP (f->menu_bar_window))
@@ -1338,10 +1338,10 @@ x_set_tool_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
       /* height can be zero here. */
       if (height > 0 && width > 0)
         {
-          BLOCK_INPUT;
+          block_input ();
           x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                         0, y, width, height, False);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 
       if (WINDOWP (f->tool_bar_window))
@@ -1494,7 +1494,7 @@ x_set_name_internal (FRAME_PTR f, Lisp_Object name)
 {
   if (FRAME_X_WINDOW (f))
     {
-      BLOCK_INPUT;
+      block_input ();
       {
         XTextProperty text, icon;
         ptrdiff_t bytes;
@@ -1586,7 +1586,7 @@ x_set_name_internal (FRAME_PTR f, Lisp_Object name)
         if (do_free_text_value)
           xfree (text.value);
       }
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -1779,7 +1779,7 @@ hack_wm_protocols (FRAME_PTR f, Widget widget)
   int need_focus = 1;
   int need_save = 1;
 
-  BLOCK_INPUT;
+  block_input ();
   {
     Atom type;
     unsigned char *catoms;
@@ -1827,7 +1827,7 @@ hack_wm_protocols (FRAME_PTR f, Widget widget)
                        XA_ATOM, 32, PropModeAppend,
                        (unsigned char *) props, count);
   }
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 #endif
 
@@ -2350,7 +2350,7 @@ x_window (struct frame *f, long window_prompting, int minibuffer_only)
   Arg al [25];
   int ac;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Use the resource name as the top-level widget name
      for looking up resources.  Make a non-Lisp copy
@@ -2572,7 +2572,7 @@ x_window (struct frame *f, long window_prompting, int minibuffer_only)
                  f->output_data.x->current_cursor
                  = f->output_data.x->text_cursor);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* This is a no-op, except under Motif.  Make sure main areas are
      set to something reasonable, in case we get an error later.  */
@@ -2591,7 +2591,7 @@ x_window (FRAME_PTR f)
   FRAME_XIC (f) = NULL;
   if (use_xim)
   {
-    BLOCK_INPUT;
+    block_input ();
     create_frame_xic (f);
     if (FRAME_XIC (f))
       {
@@ -2613,7 +2613,7 @@ x_window (FRAME_PTR f)
                                      attribute_mask, &attributes);
           }
       }
-    UNBLOCK_INPUT;
+    unblock_input ();
   }
 #endif
 }
@@ -2638,7 +2638,7 @@ x_window (struct frame *f)
   attribute_mask = (CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
                     | CWColormap);
 
-  BLOCK_INPUT;
+  block_input ();
   FRAME_X_WINDOW (f)
     = XCreateWindow (FRAME_X_DISPLAY (f),
                      f->output_data.x->parent_desc,
@@ -2715,7 +2715,7 @@ x_window (struct frame *f)
                  f->output_data.x->current_cursor
                  = f->output_data.x->text_cursor);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (FRAME_X_WINDOW (f) == 0)
     error ("Unable to create window");
@@ -2768,7 +2768,7 @@ x_icon (struct frame *f, Lisp_Object parms)
   else if (!EQ (icon_x, Qunbound) || !EQ (icon_y, Qunbound))
     error ("Both left and top icon corners of icon must be specified");
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (! EQ (icon_x, Qunbound))
     x_wm_set_icon_position (f, XINT (icon_x), XINT (icon_y));
@@ -2787,7 +2787,7 @@ x_icon (struct frame *f, Lisp_Object parms)
                            ? f->icon_name
                            : f->name)));
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Make the GCs needed for this window, setting the
@@ -2799,7 +2799,7 @@ x_make_gc (struct frame *f)
 {
   XGCValues gc_values;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Create the GCs of this frame.
      Note that many default values are used.  */
@@ -2847,7 +2847,7 @@ x_make_gc (struct frame *f)
         FRAME_BACKGROUND_PIXEL (f),
         DefaultDepth (FRAME_X_DISPLAY (f), FRAME_X_SCREEN_NUMBER (f))));
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -2858,7 +2858,7 @@ x_free_gcs (struct frame *f)
 {
   Display *dpy = FRAME_X_DISPLAY (f);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (f->output_data.x->normal_gc)
     {
@@ -2884,7 +2884,7 @@ x_free_gcs (struct frame *f)
       f->output_data.x->border_tile = 0;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3007,10 +3007,10 @@ If FRAME is nil, use the selected frame.  */)
   if (NILP (frame))
     frame = selected_frame;
   f = XFRAME (frame);
-  BLOCK_INPUT;
+  block_input ();
   if (FRAME_X_P (f))
     x_wm_set_size_hint (f, 0, 0);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Qnil;
 }
 
@@ -3405,9 +3405,9 @@ This function is an internal primitive--use `make-frame' instead.  */)
   /* Tell the server what size and position, etc, we want, and how
      badly we want them.  This should be done after we have the menu
      bar so that its size can be taken into account.  */
-  BLOCK_INPUT;
+  block_input ();
   x_wm_set_size_hint (f, window_prompting, 0);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Make the window appear on the frame and enable display, unless
      the caller says not to.  However, with explicit parent, Emacs
@@ -3431,7 +3431,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Set machine name and pid for the purpose of window managers.  */
   set_machine_and_pid_properties (f);
@@ -3447,7 +3447,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
                        (unsigned char *) &dpyinfo->client_leader_window, 1);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Initialize `default-minibuffer-frame' in case this is the first
      frame on this terminal.  */
@@ -3506,7 +3506,7 @@ FRAME nil means use the selected frame.  */)
   struct frame *f = check_x_frame (frame);
   Display *dpy = FRAME_X_DISPLAY (f);
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (dpy);
 
   if (FRAME_X_EMBEDDED_P (f))
@@ -3524,7 +3524,7 @@ FRAME nil means use the selected frame.  */)
     }
 
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -4152,9 +4152,9 @@ If TERMINAL is omitted or nil, that stands for the selected frame's display.  */
 void
 x_sync (FRAME_PTR f)
 {
-  BLOCK_INPUT;
+  block_input ();
   XSync (FRAME_X_DISPLAY (f), False);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -4229,7 +4229,7 @@ FRAME.  Default is to change on the edit X window.  */)
       nelements = SBYTES (value);
     }
 
-  BLOCK_INPUT;
+  block_input ();
   prop_atom = XInternAtom (FRAME_X_DISPLAY (f), SSDATA (prop), False);
   if (! NILP (type))
     {
@@ -4248,7 +4248,7 @@ FRAME.  Default is to change on the edit X window.  */)
 
   /* Make sure the property is set when we return.  */
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return value;
 }
@@ -4264,13 +4264,13 @@ FRAME nil or omitted means use the selected frame.  Value is PROP.  */)
   Atom prop_atom;
 
   CHECK_STRING (prop);
-  BLOCK_INPUT;
+  block_input ();
   prop_atom = XInternAtom (FRAME_X_DISPLAY (f), SSDATA (prop), False);
   XDeleteProperty (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), prop_atom);
 
   /* Make sure the property is removed when we return.  */
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return prop;
 }
@@ -4318,7 +4318,7 @@ no value of TYPE (always string in the MS Windows case).  */)
         target_window = FRAME_X_DISPLAY_INFO (f)->root_window;
     }
 
-  BLOCK_INPUT;
+  block_input ();
   if (STRINGP (type))
     {
       if (strcmp ("AnyPropertyType", SSDATA (type)) == 0)
@@ -4384,7 +4384,7 @@ no value of TYPE (always string in the MS Windows case).  */)
       if (tmp_data) XFree (tmp_data);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   UNGCPRO;
   return prop_value;
 }
@@ -4415,7 +4415,7 @@ show_hourglass (struct atimer *timer)
     {
       Lisp_Object rest, frame;
 
-      BLOCK_INPUT;
+      block_input ();
 
       FOR_EACH_FRAME (rest, frame)
         {
@@ -4459,7 +4459,7 @@ show_hourglass (struct atimer *timer)
         }
 
       hourglass_shown_p = 1;
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -4474,7 +4474,7 @@ hide_hourglass (void)
     {
       Lisp_Object rest, frame;
 
-      BLOCK_INPUT;
+      block_input ();
       FOR_EACH_FRAME (rest, frame)
         {
           struct frame *f = XFRAME (frame);
@@ -4493,7 +4493,7 @@ hide_hourglass (void)
         }
 
       hourglass_shown_p = 0;
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -4743,7 +4743,7 @@ x_create_tip_frame (struct x_display_info *dpyinfo,
     unsigned long mask;
     Atom type = FRAME_X_DISPLAY_INFO (f)->Xatom_net_window_type_tooltip;
 
-    BLOCK_INPUT;
+    block_input ();
     mask = CWBackPixel | CWOverrideRedirect | CWEventMask;
     if (DoesSaveUnders (dpyinfo->screen))
       mask |= CWSaveUnder;
@@ -4770,7 +4770,7 @@ x_create_tip_frame (struct x_display_info *dpyinfo,
                      FRAME_X_DISPLAY_INFO (f)->Xatom_net_window_type,
                      XA_ATOM, 32, PropModeReplace,
                      (unsigned char *)&type, 1);
-    UNBLOCK_INPUT;
+    unblock_input ();
   }
 
   x_make_gc (f);
@@ -4884,10 +4884,10 @@ compute_tip_xy (struct frame *f, Lisp_Object parms, Lisp_Object dx, Lisp_Object
      show it.  */
   if (!INTEGERP (left) || !INTEGERP (top))
     {
-      BLOCK_INPUT;
+      block_input ();
       XQueryPointer (FRAME_X_DISPLAY (f), FRAME_X_DISPLAY_INFO (f)->root_window,
                      &root, &child, root_x, root_y, &win_x, &win_y, &pmask);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   if (INTEGERP (top))
@@ -4985,20 +4985,21 @@ Text larger than the specified size is clipped.  */)
 #ifdef USE_GTK
   if (x_gtk_use_system_tooltips)
     {
-      int ok;
+      bool ok;
 
       /* Hide a previous tip, if any.  */
       Fx_hide_tip ();
 
-      BLOCK_INPUT;
-      if ((ok = xg_prepare_tooltip (f, string, &width, &height)) != 0)
+      block_input ();
+      ok = xg_prepare_tooltip (f, string, &width, &height);
+      if (ok)
         {
           compute_tip_xy (f, parms, dx, dy, width, height, &root_x, &root_y);
           xg_show_tooltip (f, root_x, root_y);
           /* This is used in Fx_hide_tip.  */
           XSETFRAME (tip_frame, f);
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (ok) goto start_timer;
     }
 #endif /* USE_GTK */
@@ -5026,12 +5027,12 @@ Text larger than the specified size is clipped.  */)
               call1 (Qcancel_timer, timer);
             }
 
-          BLOCK_INPUT;
+          block_input ();
           compute_tip_xy (tip_f, parms, dx, dy, FRAME_PIXEL_WIDTH (tip_f),
                           FRAME_PIXEL_HEIGHT (tip_f), &root_x, &root_y);
           XMoveWindow (FRAME_X_DISPLAY (tip_f), FRAME_X_WINDOW (tip_f),
                        root_x, root_y);
-          UNBLOCK_INPUT;
+          unblock_input ();
           goto start_timer;
         }
     }
@@ -5185,11 +5186,11 @@ Text larger than the specified size is clipped.  */)
      show it.  */
   compute_tip_xy (f, parms, dx, dy, width, height, &root_x, &root_y);
 
-  BLOCK_INPUT;
+  block_input ();
   XMoveResizeWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                      root_x, root_y, width, height);
   XMapRaised (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Draw into the window.  */
   w->must_be_updated_p = 1;
@@ -5261,9 +5262,9 @@ Value is t if tooltip was open, nil otherwise.  */)
         if (!DoesSaveUnders (FRAME_X_DISPLAY_INFO (f)->screen)
             && w != NULL)
           {
-            BLOCK_INPUT;
+            block_input ();
             xlwmenu_redisplay (w);
-            UNBLOCK_INPUT;
+            unblock_input ();
           }
       }
 #endif /* USE_LUCID */
@@ -5327,11 +5328,11 @@ clean_up_file_dialog (Lisp_Object arg)
   Widget dialog = (Widget) p->pointer;
 
   /* Clean up.  */
-  BLOCK_INPUT;
+  block_input ();
   XtUnmanageChild (dialog);
   XtDestroyWidget (dialog);
   x_menu_set_in_use (0);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -5372,7 +5373,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
   /* Prevent redisplay.  */
   specbind (Qinhibit_redisplay, Qt);
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Create the dialog with PROMPT as title, using DIR as initial
      directory and using "*" as pattern.  */
@@ -5486,7 +5487,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
   else
     file = Qnil;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   UNGCPRO;
 
   /* Make "Cancel" equivalent to C-g.  */
@@ -5543,7 +5544,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
   specbind (Qinhibit_redisplay, Qt);
   record_unwind_protect (clean_up_dialog, Qnil);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (STRINGP (default_filename))
     cdef_file = SSDATA (default_filename);
@@ -5560,7 +5561,7 @@ Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.  */)
       xfree (fn);
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   UNGCPRO;
 
   /* Make "Cancel" equivalent to C-g.  */
@@ -5600,7 +5601,7 @@ nil, it defaults to the selected frame. */)
   specbind (Qinhibit_redisplay, Qt);
   record_unwind_protect (clean_up_dialog, Qnil);
 
-  BLOCK_INPUT;
+  block_input ();
 
   GCPRO2 (font_param, font);
 
@@ -5618,7 +5619,7 @@ nil, it defaults to the selected frame. */)
   font = xg_get_font (f, default_name);
   xfree (default_name);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (NILP (font))
     Fsignal (Qquit, Qnil);
@@ -5655,14 +5656,14 @@ present and mapped to the usual X keysyms.  */)
   Lisp_Object have_keys;
   int major, minor, op, event, error_code;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Check library version in case we're dynamically linked.  */
   major = XkbMajorVersion;
   minor = XkbMinorVersion;
   if (!XkbLibraryVersion (&major, &minor))
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return Qlambda;
     }
 
@@ -5671,7 +5672,7 @@ present and mapped to the usual X keysyms.  */)
   minor = XkbMinorVersion;
   if (!XkbQueryExtension (dpy, &op, &event, &error_code, &major, &minor))
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return Qlambda;
     }
 
@@ -5724,7 +5725,7 @@ present and mapped to the usual X keysyms.  */)
           && XKeysymToKeycode (dpy, XK_BackSpace) == backspace_keycode)
         have_keys = Qt;
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
   return have_keys;
 #else /* not HAVE_XKBGETKEYBOARD */
   return Qlambda;
diff --git a/src/xfont.c b/src/xfont.c
index 1f2fd13f1b7..2d493088b0b 100644
--- a/src/xfont.c
+++ b/src/xfont.c
@@ -362,7 +362,7 @@ xfont_list_pattern (Display *display, const char *pattern,
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (display);
 
   for (limit = 512; ; limit *= 2)
@@ -479,7 +479,7 @@ xfont_list_pattern (Display *display, const char *pattern,
     }
 
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   FONT_ADD_LOG ("xfont-list", build_string (pattern), list);
   return list;
@@ -588,7 +588,7 @@ xfont_match (Lisp_Object frame, Lisp_Object spec)
   if (xfont_encode_coding_xlfd (name) < 0)
     return Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
   entity = Qnil;
   xfont = XLoadQueryFont (display, name);
   if (xfont)
@@ -615,7 +615,7 @@ xfont_match (Lisp_Object frame, Lisp_Object spec)
         }
       XFreeFont (display, xfont);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   FONT_ADD_LOG ("xfont-match", spec, entity);
   return entity;
@@ -632,7 +632,7 @@ xfont_list_family (Lisp_Object frame)
   char *last_family IF_LINT (= 0);
   int last_len;
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (dpyinfo->display);
   names = XListFonts (dpyinfo->display, "-*-*-*-*-*-*-*-*-*-*-*-*-*-*",
                       0x8000, &num_fonts);
@@ -673,7 +673,7 @@ xfont_list_family (Lisp_Object frame)
 
   XFreeFontNames (names);
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return list;
 }
@@ -717,7 +717,7 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
       return Qnil;
     }
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (display);
   xfont = XLoadQueryFont (display, name);
   if (x_had_errors_p (display))
@@ -784,7 +784,7 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
       XFree (p0);
     }
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (! xfont)
     {
@@ -866,7 +866,7 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
   font->underline_thickness
     = (XGetFontProperty (xfont, XA_UNDERLINE_THICKNESS, &value)
        ? (long) value : 0);
@@ -882,7 +882,7 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
   font->default_ascent
     = (XGetFontProperty (xfont, dpyinfo->Xatom_MULE_DEFAULT_ASCENT, &value)
        ? (long) value : 0);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (NILP (fullname))
     fullname = AREF (font_object, FONT_NAME_INDEX);
@@ -897,18 +897,18 @@ xfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
 static void
 xfont_close (FRAME_PTR f, struct font *font)
 {
-  BLOCK_INPUT;
+  block_input ();
   XFreeFont (FRAME_X_DISPLAY (f), ((struct xfont_info *) font)->xfont);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static int
 xfont_prepare_face (FRAME_PTR f, struct face *face)
 {
-  BLOCK_INPUT;
+  block_input ();
   XSetFont (FRAME_X_DISPLAY (f), face->gc,
             ((struct xfont_info *) face->font)->xfont->fid);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return 0;
 }
@@ -1028,9 +1028,9 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
 
   if (s->gc != s->face->gc)
     {
-      BLOCK_INPUT;
+      block_input ();
       XSetFont (s->display, gc, xfont->fid);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   if (xfont->min_byte1 == 0 && xfont->max_byte1 == 0)
@@ -1039,7 +1039,7 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
       char *str = SAFE_ALLOCA (len);
       for (i = 0; i < len ; i++)
         str[i] = XCHAR2B_BYTE2 (s->char2b + from + i);
-      BLOCK_INPUT;
+      block_input ();
       if (with_background)
         {
           if (s->padding_p)
@@ -1060,12 +1060,12 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
             XDrawString (FRAME_X_DISPLAY (s->f), FRAME_X_WINDOW (s->f),
                          gc, x, y, str, len);
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
       SAFE_FREE ();
       return s->nchars;
     }
 
-  BLOCK_INPUT;
+  block_input ();
   if (with_background)
     {
       if (s->padding_p)
@@ -1086,7 +1086,7 @@ xfont_draw (struct glyph_string *s, int from, int to, int x, int y,
         XDrawString16 (FRAME_X_DISPLAY (s->f), FRAME_X_WINDOW (s->f),
                        gc, x, y, s->char2b + from, len);
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return len;
 }
diff --git a/src/xftfont.c b/src/xftfont.c
index 9f52eb8b233..372ed87705f 100644
--- a/src/xftfont.c
+++ b/src/xftfont.c
@@ -93,7 +93,7 @@ xftfont_get_colors (FRAME_PTR f, struct face *face, GC gc, struct xftface_info *
       XGCValues xgcv;
       bool fg_done = 0, bg_done = 0;
 
-      BLOCK_INPUT;
+      block_input ();
       XGetGCValues (FRAME_X_DISPLAY (f), gc,
                     GCForeground | GCBackground, &xgcv);
       if (xftface_info)
@@ -131,7 +131,7 @@ xftfont_get_colors (FRAME_PTR f, struct face *face, GC gc, struct xftface_info *
               bg->color.blue = colors[1].blue;
             }
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -324,7 +324,7 @@ xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
   FcPatternAddInteger (pat, FC_INDEX, XINT (idx));
 
 
-  BLOCK_INPUT;
+  block_input ();
   /* Make sure that the Xrender extension is added before the Xft one.
      Otherwise, the close-display hook set by Xft is called after the
      one for Xrender, and the former tries to re-add the latter.  This
@@ -345,12 +345,12 @@ xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
   xftfont = XftFontOpenPattern (display, match);
   if (!xftfont)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       XftPatternDestroy (match);
       return Qnil;
     }
   ft_face = XftLockFace (xftfont);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* We should not destroy PAT here because it is kept in XFTFONT and
      destroyed automatically when XFTFONT is closed.  */
@@ -399,7 +399,7 @@ xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
       for (ch = 0; ch < 95; ch++)
         ascii_printable[ch] = ' ' + ch;
     }
-  BLOCK_INPUT;
+  block_input ();
 
   /* Unfortunately Xft doesn't provide a way to get minimum char
      width.  So, we set min_width to space_width.  */
@@ -425,7 +425,7 @@ xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
       font->average_width = (font->space_width + extents.xOff) / 95;
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   font->ascent = xftfont->ascent;
   font->descent = xftfont->descent;
@@ -494,10 +494,10 @@ xftfont_close (FRAME_PTR f, struct font *font)
   if (xftfont_info->otf)
     OTF_close (xftfont_info->otf);
 #endif
-  BLOCK_INPUT;
+  block_input ();
   XftUnlockFace (xftfont_info->xftfont);
   XftFontClose (xftfont_info->display, xftfont_info->xftfont);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 static int
@@ -581,10 +581,10 @@ xftfont_text_extents (struct font *font, unsigned int *code, int nglyphs, struct
   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
   XGlyphInfo extents;
 
-  BLOCK_INPUT;
+  block_input ();
   XftGlyphExtents (xftfont_info->display, xftfont_info->xftfont, code, nglyphs,
                    &extents);
-  UNBLOCK_INPUT;
+  unblock_input ();
   if (metrics)
     {
       metrics->lbearing = - extents.x;
@@ -603,12 +603,12 @@ xftfont_get_xft_draw (FRAME_PTR f)
 
   if (! xft_draw)
     {
-      BLOCK_INPUT;
+      block_input ();
       xft_draw= XftDrawCreate (FRAME_X_DISPLAY (f),
                                FRAME_X_WINDOW (f),
                                FRAME_X_VISUAL (f),
                                FRAME_X_COLORMAP (f));
-      UNBLOCK_INPUT;
+      unblock_input ();
       eassert (xft_draw != NULL);
       font_put_frame_data (f, &xftfont_driver, xft_draw);
     }
@@ -633,7 +633,7 @@ xftfont_draw (struct glyph_string *s, int from, int to, int x, int y,
     xftface_info = (struct xftface_info *) face->extra;
   xftfont_get_colors (f, face, s->gc, xftface_info,
                       &fg, with_background ? &bg : NULL);
-  BLOCK_INPUT;
+  block_input ();
   if (s->num_clips > 0)
     XftDrawSetClipRectangles (xft_draw, 0, 0, s->clip, s->num_clips);
   else
@@ -654,7 +654,7 @@ xftfont_draw (struct glyph_string *s, int from, int to, int x, int y,
   else
     XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
                    x, y, code, len);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return len;
 }
@@ -690,9 +690,9 @@ xftfont_end_for_frame (FRAME_PTR f)
 
   if (xft_draw)
     {
-      BLOCK_INPUT;
+      block_input ();
       XftDrawDestroy (xft_draw);
-      UNBLOCK_INPUT;
+      unblock_input ();
       font_put_frame_data (f, &xftfont_driver, NULL);
     }
   return 0;
diff --git a/src/xmenu.c b/src/xmenu.c
index d03a4bc974b..96a1ae87fdc 100644
--- a/src/xmenu.c
+++ b/src/xmenu.c
@@ -165,7 +165,7 @@ mouse_position_for_popup (FRAME_PTR f, int *x, int *y)
   if (! FRAME_X_P (f))
     emacs_abort ();
 
-  BLOCK_INPUT;
+  block_input ();
 
   XQueryPointer (FRAME_X_DISPLAY (f),
                  DefaultRootWindow (FRAME_X_DISPLAY (f)),
@@ -186,7 +186,7 @@ mouse_position_for_popup (FRAME_PTR f, int *x, int *y)
                     we don't care.  */
                  (unsigned int *) &dummy);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* xmenu_show expects window coordinates, not root window
      coordinates.  Translate.  */
@@ -328,9 +328,9 @@ for instance using the window manager, then this produces a quit and
     list_of_panes (Fcons (contents, Qnil));
 
     /* Display them in a dialog box.  */
-    BLOCK_INPUT;
+    block_input ();
     selection = xdialog_show (f, 0, title, header, &error_name);
-    UNBLOCK_INPUT;
+    unblock_input ();
 
     unbind_to (specpdl_count, Qnil);
     discard_menu_items ();
@@ -490,7 +490,7 @@ If FRAME is nil or not given, use the selected frame.  */)
   XEvent ev;
   FRAME_PTR f = check_x_frame (frame);
   Widget menubar;
-  BLOCK_INPUT;
+  block_input ();
 
   if (FRAME_EXTERNAL_MENU_BAR (f))
     set_frame_menubar (f, 0, 1);
@@ -548,7 +548,7 @@ If FRAME is nil or not given, use the selected frame.  */)
         }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -569,9 +569,9 @@ If FRAME is nil or not given, use the selected frame.  */)
   FRAME_PTR f;
 
   /* gcc 2.95 doesn't accept the FRAME_PTR declaration after
-     BLOCK_INPUT.  */
+     block_input ().  */
 
-  BLOCK_INPUT;
+  block_input ();
   f = check_x_frame (frame);
 
   if (FRAME_EXTERNAL_MENU_BAR (f))
@@ -590,7 +590,7 @@ If FRAME is nil or not given, use the selected frame.  */)
           g_list_free (children);
         }
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
@@ -642,7 +642,7 @@ x_activate_menubar (FRAME_PTR f)
 #endif
 
   set_frame_menubar (f, 0, 1);
-  BLOCK_INPUT;
+  block_input ();
   popup_activated_flag = 1;
 #ifdef USE_GTK
   XPutBackEvent (f->output_data.x->display_info->display,
@@ -650,7 +650,7 @@ x_activate_menubar (FRAME_PTR f)
 #else
   XtDispatchEvent (f->output_data.x->saved_menu_event);
 #endif
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Ignore this if we get it a second time.  */
   f->output_data.x->saved_menu_event->type = 0;
@@ -803,10 +803,10 @@ menubar_selection_callback (GtkWidget *widget, gpointer client_data)
      sit-for will exit at once if the focus event follows the menu selection
      event.  */
 
-  BLOCK_INPUT;
+  block_input ();
   while (gtk_events_pending ())
     gtk_main_iteration ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   find_and_call_menu_selection (cb_data->cl_data->f,
                                 cb_data->cl_data->menu_bar_items_used,
@@ -834,13 +834,13 @@ menubar_selection_callback (Widget widget, LWLIB_ID id, XtPointer client_data)
 #endif /* not USE_GTK */
 
 /* Recompute all the widgets of frame F, when the menu bar has been
-   changed.  Value is non-zero if widgets were updated.  */
+   changed.  */
 
-static int
+static void
 update_frame_menubar (FRAME_PTR f)
 {
 #ifdef USE_GTK
-  return xg_update_frame_menubar (f);
+  xg_update_frame_menubar (f);
 #else
   struct x_output *x;
   int columns, rows;
@@ -851,9 +851,9 @@ update_frame_menubar (FRAME_PTR f)
   x = f->output_data.x;
 
   if (!x->menubar_widget || XtIsManaged (x->menubar_widget))
-    return 0;
+    return;
 
-  BLOCK_INPUT;
+  block_input ();
   /* Save the size of the frame because the pane widget doesn't accept
      to resize itself. So force it.  */
   columns = FRAME_COLS (f);
@@ -880,9 +880,8 @@ update_frame_menubar (FRAME_PTR f)
 
   /* Force the pane widget to resize itself with the right values.  */
   EmacsFrameSetCharSize (x->edit_widget, columns, rows);
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif
-  return 1;
 }
 
 #ifdef USE_LUCID
@@ -921,7 +920,7 @@ apply_systemfont_to_menu (struct frame *f, Widget w)
    it is set the first time this is called, from initialize_frame_menubar.  */
 
 void
-set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
+set_frame_menubar (FRAME_PTR f, bool first_time, bool deep_p)
 {
   xt_or_gtk_widget menubar_widget;
 #ifdef USE_X_TOOLKIT
@@ -1164,7 +1163,7 @@ set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
 
   /* Create or update the menu bar widget.  */
 
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef USE_GTK
   xg_crazy_callback_abort = 1;
@@ -1264,7 +1263,7 @@ set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
   xg_crazy_callback_abort = 0;
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Called from Fx_create_frame to create the initial menubar of a frame
@@ -1313,7 +1312,7 @@ free_frame_menubar (FRAME_PTR f)
       Position x0, y0, x1, y1;
 #endif
 
-      BLOCK_INPUT;
+      block_input ();
 
 #ifdef USE_MOTIF
       if (f->output_data.x->widget)
@@ -1332,7 +1331,7 @@ free_frame_menubar (FRAME_PTR f)
 #endif
           x_set_window_size (f, 0, FRAME_COLS (f), FRAME_LINES (f));
         }
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 #endif /* not USE_GTK */
@@ -1417,9 +1416,9 @@ pop_down_menu (Lisp_Object arg)
   struct Lisp_Save_Value *p = XSAVE_VALUE (arg);
 
   popup_activated_flag = 0;
-  BLOCK_INPUT;
+  block_input ();
   gtk_widget_destroy (GTK_WIDGET (p->pointer));
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Qnil;
 }
 
@@ -1527,9 +1526,9 @@ pop_down_menu (Lisp_Object arg)
   LWLIB_ID id = (XINT (XCAR (arg)) << 4 * sizeof (LWLIB_ID)
                  | XINT (XCDR (arg)));
 
-  BLOCK_INPUT;
+  block_input ();
   lw_destroy_all_widgets (id);
-  UNBLOCK_INPUT;
+  unblock_input ();
   popup_activated_flag = 0;
 
   return Qnil;
@@ -1955,9 +1954,9 @@ dialog_selection_callback (Widget widget, LWLIB_ID id, XtPointer client_data)
   if ((intptr_t) client_data != -1)
     menu_item_selection = (Lisp_Object *) client_data;
 
-  BLOCK_INPUT;
+  block_input ();
   lw_destroy_all_widgets (id);
-  UNBLOCK_INPUT;
+  unblock_input ();
   popup_activated_flag = 0;
 }
 
@@ -2251,7 +2250,7 @@ pop_down_menu (Lisp_Object arg)
   FRAME_PTR f = p1->pointer;
   XMenu *menu = p2->pointer;
 
-  BLOCK_INPUT;
+  block_input ();
 #ifndef MSDOS
   XUngrabPointer (FRAME_X_DISPLAY (f), CurrentTime);
   XUngrabKeyboard (FRAME_X_DISPLAY (f), CurrentTime);
@@ -2271,7 +2270,7 @@ pop_down_menu (Lisp_Object arg)
 
 #endif /* HAVE_X_WINDOWS */
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return Qnil;
 }
diff --git a/src/xml.c b/src/xml.c
index b668525cf26..a22ca208743 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -82,7 +82,7 @@ libxml2_loaded_p (void)
 #endif  /* !WINDOWSNT */
 
 static int
-init_libxml2_functions (Lisp_Object libraries)
+init_libxml2_functions (void)
 {
 #ifdef WINDOWSNT
   if (libxml2_loaded_p ())
@@ -91,7 +91,7 @@ init_libxml2_functions (Lisp_Object libraries)
     {
       HMODULE library;
 
-      if (!(library = w32_delayed_load (libraries, Qlibxml2_dll)))
+      if (!(library = w32_delayed_load (Qlibxml2_dll)))
         {
           message ("%s", "libxml2 library not found");
           return 0;
@@ -257,7 +257,7 @@ DEFUN ("libxml-parse-html-region", Flibxml_parse_html_region,
 If BASE-URL is non-nil, it is used to expand relative URLs.  */)
   (Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
 {
-  if (init_libxml2_functions (Vdynamic_library_alist))
+  if (init_libxml2_functions ())
     return parse_region (start, end, base_url, 1);
   return Qnil;
 }
@@ -269,7 +269,7 @@ DEFUN ("libxml-parse-xml-region", Flibxml_parse_xml_region,
 If BASE-URL is non-nil, it is used to expand relative URLs.  */)
   (Lisp_Object start, Lisp_Object end, Lisp_Object base_url)
 {
-  if (init_libxml2_functions (Vdynamic_library_alist))
+  if (init_libxml2_functions ())
     return parse_region (start, end, base_url, 0);
   return Qnil;
 }
diff --git a/src/xselect.c b/src/xselect.c
index ab199e0b9b9..de9386bd7d9 100644
--- a/src/xselect.c
+++ b/src/xselect.c
@@ -247,9 +247,9 @@ symbol_to_x_atom (struct x_display_info *dpyinfo, Lisp_Object sym)
   if (!SYMBOLP (sym)) emacs_abort ();
 
   TRACE1 (" XInternAtom %s", SSDATA (SYMBOL_NAME (sym)));
-  BLOCK_INPUT;
+  block_input ();
   val = XInternAtom (dpyinfo->display, SSDATA (SYMBOL_NAME (sym)), False);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return val;
 }
 
@@ -307,16 +307,16 @@ x_atom_to_symbol (Display *dpy, Atom atom)
   if (atom == dpyinfo->Xatom_NULL)
     return QNULL;
 
-  BLOCK_INPUT;
+  block_input ();
   str = XGetAtomName (dpy, atom);
-  UNBLOCK_INPUT;
+  unblock_input ();
   TRACE1 ("XGetAtomName --> %s", str);
   if (! str) return Qnil;
   val = intern (str);
-  BLOCK_INPUT;
+  block_input ();
   /* This was allocated by Xlib, so use XFree.  */
   XFree (str);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return val;
 }
 
@@ -336,12 +336,12 @@ x_own_selection (Lisp_Object selection_name, Lisp_Object selection_value,
   Time timestamp = last_event_timestamp;
   Atom selection_atom = symbol_to_x_atom (dpyinfo, selection_name);
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (display);
   XSetSelectionOwner (display, selection_atom, selecting_window, timestamp);
   x_check_errors (display, "Can't set selection: %s");
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Now update the local cache */
   {
@@ -469,12 +469,12 @@ x_decline_selection_request (struct input_event *event)
 
   /* The reason for the error may be that the receiver has
      died in the meantime.  Handle that case.  */
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (reply->display);
   XSendEvent (reply->display, reply->requestor, False, 0L, &reply_base);
   XFlush (reply->display);
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* This is the selection request currently being processed.
@@ -536,9 +536,9 @@ x_selection_request_lisp_error (Lisp_Object ignore)
 static Lisp_Object
 x_catch_errors_unwind (Lisp_Object dummy)
 {
-  BLOCK_INPUT;
+  block_input ();
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
   return Qnil;
 }
 
@@ -610,7 +610,7 @@ x_reply_selection_request (struct input_event *event,
   if (reply->property == None)
     reply->property = reply->target;
 
-  BLOCK_INPUT;
+  block_input ();
   /* The protected block contains wait_for_property_change, which can
      run random lisp code (process handlers) or signal.  Therefore, we
      put the x_uncatch_errors call in an unwind.  */
@@ -682,7 +682,7 @@ x_reply_selection_request (struct input_event *event,
       {
         int format_bytes = cs->format / 8;
         int had_errors = x_had_errors_p (display);
-        UNBLOCK_INPUT;
+        unblock_input ();
 
         bytes_remaining = cs->size;
         bytes_remaining *= format_bytes;
@@ -703,7 +703,7 @@ x_reply_selection_request (struct input_event *event,
             int i = ((bytes_remaining < max_bytes)
                      ? bytes_remaining
                      : max_bytes) / format_bytes;
-            BLOCK_INPUT;
+            block_input ();
 
             cs->wait_object
               = expect_property_change (display, window, cs->property,
@@ -722,7 +722,7 @@ x_reply_selection_request (struct input_event *event,
                              : format_bytes);
             XFlush (display);
             had_errors = x_had_errors_p (display);
-            UNBLOCK_INPUT;
+            unblock_input ();
 
             if (had_errors) break;
 
@@ -735,7 +735,7 @@ x_reply_selection_request (struct input_event *event,
 
         /* Now write a zero-length chunk to the property to tell the
            requestor that we're done.  */
-        BLOCK_INPUT;
+        block_input ();
         if (! waiting_for_other_props_on_window (display, window))
           XSelectInput (display, window, 0L);
 
@@ -757,15 +757,15 @@ x_reply_selection_request (struct input_event *event,
   /* 2004-09-10: XSync and UNBLOCK so that possible protocol errors are
      delivered before uncatch errors.  */
   XSync (display, False);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* GTK queues events in addition to the queue in Xlib.  So we
      UNBLOCK to enter the event loop and get possible errors delivered,
      and then BLOCK again because x_uncatch_errors requires it.  */
-  BLOCK_INPUT;
+  block_input ();
   /* This calls x_uncatch_errors.  */
   unbind_to (count, Qnil);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Handle a SelectionRequest event EVENT.
@@ -1232,7 +1232,7 @@ x_get_foreign_selection (Lisp_Object selection_symbol, Lisp_Object target_type,
   if (! NILP (time_stamp))
     CONS_TO_INTEGER (time_stamp, Time, requestor_time);
 
-  BLOCK_INPUT;
+  block_input ();
   TRACE2 ("Get selection %s, type %s",
           XGetAtomName (display, type_atom),
           XGetAtomName (display, target_property));
@@ -1257,7 +1257,7 @@ x_get_foreign_selection (Lisp_Object selection_symbol, Lisp_Object target_type,
   record_unwind_protect (queue_selection_requests_unwind, Qnil);
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* This allows quits.  Also, don't wait forever.  */
   timeout = max (0, x_selection_timeout);
@@ -1309,7 +1309,7 @@ x_get_window_property (Display *display, Window window, Atom property,
      ? min (PTRDIFF_MAX, SIZE_MAX) - 1
      : LONG_MAX * x_long_size);
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* First probe the thing to find out how big it is.  */
   result = XGetWindowProperty (display, window, property,
@@ -1410,19 +1410,19 @@ x_get_window_property (Display *display, Window window, Atom property,
   data[offset] = '\0';
 
  done:
-  UNBLOCK_INPUT;
+  unblock_input ();
   *data_ret = data;
   *bytes_ret = offset;
   return;
 
  size_overflow:
   free (data);
-  UNBLOCK_INPUT;
+  unblock_input ();
   memory_full (SIZE_MAX);
 
  memory_exhausted:
   free (data);
-  UNBLOCK_INPUT;
+  unblock_input ();
   memory_full (total_size + 1);
 }
 
@@ -1454,7 +1454,7 @@ receive_incremental_selection (Display *display, Window window, Atom property,
      that property, then reading the property, then deleting it to ack.
      We are done when the sender places a property of length 0.
    */
-  BLOCK_INPUT;
+  block_input ();
   XSelectInput (display, window, STANDARD_EVENT_SET | PropertyChangeMask);
   TRACE1 ("  Delete property %s",
           SDATA (SYMBOL_NAME (x_atom_to_symbol (display, property))));
@@ -1464,7 +1464,7 @@ receive_incremental_selection (Display *display, Window window, Atom property,
   wait_object = expect_property_change (display, window, property,
                                         PropertyNewValue);
   XFlush (display);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   while (1)
     {
@@ -1496,14 +1496,14 @@ receive_incremental_selection (Display *display, Window window, Atom property,
           break;
         }
 
-      BLOCK_INPUT;
+      block_input ();
       TRACE1 ("  ACK by deleting property %s",
               XGetAtomName (display, property));
       XDeleteProperty (display, window, property);
       wait_object = expect_property_change (display, window, property,
                                             PropertyNewValue);
       XFlush (display);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       if (*size_bytes_ret - offset < tmp_size_bytes)
         *data_ret = xpalloc (*data_ret, size_bytes_ret,
@@ -1545,10 +1545,10 @@ x_get_window_property_as_lisp_data (Display *display, Window window,
   if (! data)
     {
       int there_is_a_selection_owner;
-      BLOCK_INPUT;
+      block_input ();
       there_is_a_selection_owner
         = XGetSelectionOwner (display, selection_atom);
-      UNBLOCK_INPUT;
+      unblock_input ();
       if (there_is_a_selection_owner)
         signal_error ("Selection owner couldn't convert",
                       actual_type
@@ -1565,22 +1565,22 @@ x_get_window_property_as_lisp_data (Display *display, Window window,
       /* That wasn't really the data, just the beginning.  */
 
       unsigned int min_size_bytes = * ((unsigned int *) data);
-      BLOCK_INPUT;
+      block_input ();
       /* Use xfree, not XFree, because x_get_window_property
          calls xmalloc itself.  */
       xfree (data);
-      UNBLOCK_INPUT;
+      unblock_input ();
       receive_incremental_selection (display, window, property, target_type,
                                      min_size_bytes, &data, &bytes,
                                      &actual_type, &actual_format,
                                      &actual_size);
     }
 
-  BLOCK_INPUT;
+  block_input ();
   TRACE1 ("  Delete property %s", XGetAtomName (display, property));
   XDeleteProperty (display, window, property);
   XFlush (display);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* It's been read.  Now convert it to a lisp object in some semi-rational
      manner.  */
@@ -2096,13 +2096,13 @@ On MS-DOS, all this does is return non-nil if we own the selection.  */)
 
   selection_atom = symbol_to_x_atom (dpyinfo, selection);
 
-  BLOCK_INPUT;
+  block_input ();
   if (NILP (time_object))
     timestamp = last_event_timestamp;
   else
     CONS_TO_INTEGER (time_object, Time, timestamp);
   XSetSelectionOwner (dpyinfo->display, selection_atom, None, timestamp);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* It doesn't seem to be guaranteed that a SelectionClear event will be
      generated for a window which owns the selection when that window sets
@@ -2179,9 +2179,9 @@ On Nextstep, TERMINAL is unused.  */)
 
   atom = symbol_to_x_atom (dpyinfo, selection);
   if (atom == 0) return Qnil;
-  BLOCK_INPUT;
+  block_input ();
   owner = XGetSelectionOwner (dpyinfo->display, atom);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return (owner ? Qt : Qnil);
 }
 
@@ -2353,9 +2353,9 @@ x_fill_property_data (Display *dpy, Lisp_Object data, void *ret, int format)
         val = cons_to_signed (o, LONG_MIN, LONG_MAX);
       else if (STRINGP (o))
         {
-          BLOCK_INPUT;
+          block_input ();
           val = (long) XInternAtom (dpy, SSDATA (o), False);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
       else
         error ("Wrong type, must be string, number or cons");
@@ -2413,7 +2413,7 @@ mouse_position_for_drop (FRAME_PTR f, int *x, int *y)
   Window root, dummy_window;
   int dummy;
 
-  BLOCK_INPUT;
+  block_input ();
 
   XQueryPointer (FRAME_X_DISPLAY (f),
                  DefaultRootWindow (FRAME_X_DISPLAY (f)),
@@ -2439,7 +2439,7 @@ mouse_position_for_drop (FRAME_PTR f, int *x, int *y)
   *x -= f->left_pos + FRAME_OUTER_TO_INNER_DIFF_X (f);
   *y -= f->top_pos + FRAME_OUTER_TO_INNER_DIFF_Y (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 DEFUN ("x-get-atom-name", Fx_get_atom_name,
@@ -2462,7 +2462,7 @@ If the value is 0 or the atom is not known, return the empty string.  */)
 
   CONS_TO_INTEGER (value, Atom, atom);
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (dpy);
   name = atom ? XGetAtomName (dpy, atom) : empty;
   had_errors = x_had_errors_p (dpy);
@@ -2474,7 +2474,7 @@ If the value is 0 or the atom is not known, return the empty string.  */)
   if (atom && name) XFree (name);
   if (NILP (ret)) ret = empty_unibyte_string;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return ret;
 }
@@ -2496,9 +2496,9 @@ FRAME is on.  If FRAME is nil, the selected frame is used.  */)
     x_atom = symbol_to_x_atom (dpyinfo, atom);
   else if (STRINGP (atom))
     {
-      BLOCK_INPUT;
+      block_input ();
       x_atom = XInternAtom (FRAME_X_DISPLAY (f), SSDATA (atom), False);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
   else
     error ("ATOM must be a symbol or a string");
@@ -2657,7 +2657,7 @@ x_send_client_event (Lisp_Object display, Lisp_Object dest, Lisp_Object from,
   if (wdest == 0) wdest = dpyinfo->root_window;
   to_root = wdest == dpyinfo->root_window;
 
-  BLOCK_INPUT;
+  block_input ();
 
   event.xclient.message_type = message_type;
   event.xclient.display = dpyinfo->display;
@@ -2683,7 +2683,7 @@ x_send_client_event (Lisp_Object display, Lisp_Object dest, Lisp_Object from,
     XFlush (dpyinfo->display);
   }
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
diff --git a/src/xsettings.c b/src/xsettings.c
index 58c84495489..7c68ff295cf 100644
--- a/src/xsettings.c
+++ b/src/xsettings.c
@@ -929,7 +929,7 @@ init_xsettings (struct x_display_info *dpyinfo)
 {
   Display *dpy = dpyinfo->display;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Select events so we can detect client messages sent when selection
      owner changes.  */
@@ -939,7 +939,7 @@ init_xsettings (struct x_display_info *dpyinfo)
   if (dpyinfo->xsettings_window != None)
     read_and_apply_settings (dpyinfo, False);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 void
diff --git a/src/xterm.c b/src/xterm.c
index 8c955d0e576..6cd1d583870 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -287,7 +287,7 @@ enum xembed_message
 
 /* Used in x_flush.  */
 
-static int x_alloc_nearest_color_1 (Display *, Colormap, XColor *);
+static bool x_alloc_nearest_color_1 (Display *, Colormap, XColor *);
 static void x_set_window_size_1 (struct frame *, int, int, int);
 static void x_raise_frame (struct frame *);
 static void x_lower_frame (struct frame *);
@@ -353,7 +353,7 @@ x_flush (struct frame *f)
   if (!NILP (Vinhibit_redisplay))
     return;
 
-  BLOCK_INPUT;
+  block_input ();
   if (f == NULL)
     {
       Lisp_Object rest, frame;
@@ -363,7 +363,7 @@ x_flush (struct frame *f)
     }
   else if (FRAME_X_P (f))
     XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -564,7 +564,7 @@ x_update_window_begin (struct window *w)
   updated_window = w;
   set_output_cursor (&w->cursor);
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (f == hlinfo->mouse_face_mouse_frame)
     {
@@ -577,7 +577,7 @@ x_update_window_begin (struct window *w)
         hlinfo->mouse_face_window = Qnil;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -618,7 +618,7 @@ x_update_window_end (struct window *w, int cursor_on_p, int mouse_face_overwritt
 
   if (!w->pseudo_window_p)
     {
-      BLOCK_INPUT;
+      block_input ();
 
       if (cursor_on_p)
         display_and_set_cursor (w, 1, output_cursor.hpos,
@@ -628,7 +628,7 @@ x_update_window_end (struct window *w, int cursor_on_p, int mouse_face_overwritt
       if (draw_window_fringes (w, 1))
         x_draw_vertical_border (w);
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
   /* If a row with mouse-face was overwritten, arrange for
@@ -654,9 +654,9 @@ x_update_end (struct frame *f)
   MOUSE_HL_INFO (f)->mouse_face_defer = 0;
 
 #ifndef XFlush
-  BLOCK_INPUT;
+  block_input ();
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif
 }
 
@@ -675,13 +675,13 @@ XTframe_up_to_date (struct frame *f)
       if (hlinfo->mouse_face_deferred_gc
           || f == hlinfo->mouse_face_mouse_frame)
         {
-          BLOCK_INPUT;
+          block_input ();
           if (hlinfo->mouse_face_mouse_frame)
             note_mouse_highlight (hlinfo->mouse_face_mouse_frame,
                                   hlinfo->mouse_face_mouse_x,
                                   hlinfo->mouse_face_mouse_y);
           hlinfo->mouse_face_deferred_gc = 0;
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
 }
@@ -722,13 +722,13 @@ x_after_update_window_line (struct glyph_row *desired_row)
     {
       int y = WINDOW_TO_FRAME_PIXEL_Y (w, max (0, desired_row->y));
 
-      BLOCK_INPUT;
+      block_input ();
       x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                     0, y, width, height, False);
       x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                     FRAME_PIXEL_WIDTH (f) - width,
                     y, width, height, False);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -899,8 +899,8 @@ static void x_compute_glyph_string_overhangs (struct glyph_string *);
 static void x_set_cursor_gc (struct glyph_string *);
 static void x_set_mode_line_face_gc (struct glyph_string *);
 static void x_set_mouse_face_gc (struct glyph_string *);
-static int x_alloc_lighter_color (struct frame *, Display *, Colormap,
-                                  unsigned long *, double, int);
+static bool x_alloc_lighter_color (struct frame *, Display *, Colormap,
+                                   unsigned long *, double, int);
 static void x_setup_relief_color (struct frame *, struct relief *,
                                   double, int, unsigned long);
 static void x_setup_relief_colors (struct glyph_string *);
@@ -1469,9 +1469,9 @@ x_frame_of_widget (Widget widget)
    If this produces the same color as PIXEL, try a color where all RGB
    values have DELTA added.  Return the allocated color in *PIXEL.
    DISPLAY is the X display, CMAP is the colormap to operate on.
-   Value is non-zero if successful.  */
+   Value is true if successful.  */
 
-int
+bool
 x_alloc_lighter_color_for_widget (Widget widget, Display *display, Colormap cmap,
                                   unsigned long *pixel, double factor, int delta)
 {
@@ -1696,15 +1696,15 @@ x_query_color (struct frame *f, XColor *color)
 
 /* Allocate the color COLOR->pixel on DISPLAY, colormap CMAP.  If an
    exact match can't be allocated, try the nearest color available.
-   Value is non-zero if successful.  Set *COLOR to the color
+   Value is true if successful.  Set *COLOR to the color
    allocated.  */
 
-static int
+static bool
 x_alloc_nearest_color_1 (Display *dpy, Colormap cmap, XColor *color)
 {
-  int rc;
+  bool rc;
 
-  rc = XAllocColor (dpy, cmap, color);
+  rc = XAllocColor (dpy, cmap, color) != 0;
   if (rc == 0)
     {
       /* If we got to this point, the colormap is full, so we're going
@@ -1735,7 +1735,7 @@ x_alloc_nearest_color_1 (Display *dpy, Colormap cmap, XColor *color)
       color->red   = cells[nearest].red;
       color->green = cells[nearest].green;
       color->blue  = cells[nearest].blue;
-      rc = XAllocColor (dpy, cmap, color);
+      rc = XAllocColor (dpy, cmap, color) != 0;
     }
   else
     {
@@ -1768,10 +1768,10 @@ x_alloc_nearest_color_1 (Display *dpy, Colormap cmap, XColor *color)
 
 /* Allocate the color COLOR->pixel on frame F, colormap CMAP.  If an
    exact match can't be allocated, try the nearest color available.
-   Value is non-zero if successful.  Set *COLOR to the color
+   Value is true if successful.  Set *COLOR to the color
    allocated.  */
 
-int
+bool
 x_alloc_nearest_color (struct frame *f, Colormap cmap, XColor *color)
 {
   gamma_correct (f, color);
@@ -1789,10 +1789,10 @@ x_copy_color (struct frame *f, long unsigned int pixel)
   XColor color;
 
   color.pixel = pixel;
-  BLOCK_INPUT;
+  block_input ();
   x_query_color (f, &color);
   XAllocColor (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), &color);
-  UNBLOCK_INPUT;
+  unblock_input ();
 #ifdef DEBUG_X_COLORS
   register_color (pixel);
 #endif
@@ -1821,12 +1821,12 @@ x_copy_color (struct frame *f, long unsigned int pixel)
    DISPLAY is the X display, CMAP is the colormap to operate on.
    Value is non-zero if successful.  */
 
-static int
+static bool
 x_alloc_lighter_color (struct frame *f, Display *display, Colormap cmap, long unsigned int *pixel, double factor, int delta)
 {
   XColor color, new;
   long bright;
-  int success_p;
+  bool success_p;
 
   /* Get RGB color values.  */
   color.pixel = *pixel;
@@ -3028,7 +3028,7 @@ x_clear_frame (struct frame *f)
 
   /* We don't set the output cursor here because there will always
      follow an explicit cursor_to.  */
-  BLOCK_INPUT;
+  block_input ();
 
   XClearWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f));
 
@@ -3045,7 +3045,7 @@ x_clear_frame (struct frame *f)
 
   XFlush (FRAME_X_DISPLAY (f));
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3055,7 +3055,7 @@ x_clear_frame (struct frame *f)
 static void
 XTflash (struct frame *f)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   {
 #ifdef USE_GTK
@@ -3208,14 +3208,14 @@ XTflash (struct frame *f)
     }
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
 static void
 XTtoggle_invisible_pointer (FRAME_PTR f, int invisible)
 {
-  BLOCK_INPUT;
+  block_input ();
   if (invisible)
     {
       if (FRAME_X_DISPLAY_INFO (f)->invisible_cursor != 0)
@@ -3226,7 +3226,7 @@ XTtoggle_invisible_pointer (FRAME_PTR f, int invisible)
     XDefineCursor (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                    f->output_data.x->current_cursor);
   f->pointer_invisible = invisible;
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3241,10 +3241,10 @@ XTring_bell (struct frame *f)
         XTflash (f);
       else
         {
-          BLOCK_INPUT;
+          block_input ();
           XBell (FRAME_X_DISPLAY (f), 0);
           XFlush (FRAME_X_DISPLAY (f));
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
     }
 }
@@ -3341,7 +3341,7 @@ x_scroll_run (struct window *w, struct run *run)
         height = run->height;
     }
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Cursor off.  Will be switched on again in x_update_window_end.  */
   updated_window = w;
@@ -3354,7 +3354,7 @@ x_scroll_run (struct window *w, struct run *run)
              width, height,
              x, to_y);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -3371,7 +3371,7 @@ frame_highlight (struct frame *f)
      the ICCCM (section 4.1.6) says that the window's border pixmap
      and border pixel are window attributes which are "private to the
      client", so we can always change it to whatever we want.  */
-  BLOCK_INPUT;
+  block_input ();
   /* I recently started to get errors in this XSetWindowBorder, depending on
      the window-manager in use, tho something more is at play since I've been
      using that same window-manager binary for ever.  Let's not crash just
@@ -3380,7 +3380,7 @@ frame_highlight (struct frame *f)
   XSetWindowBorder (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                     f->output_data.x->border_pixel);
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
   x_update_cursor (f, 1);
   x_set_frame_alpha (f);
 }
@@ -3392,13 +3392,13 @@ frame_unhighlight (struct frame *f)
      the ICCCM (section 4.1.6) says that the window's border pixmap
      and border pixel are window attributes which are "private to the
      client", so we can always change it to whatever we want.  */
-  BLOCK_INPUT;
+  block_input ();
   /* Same as above for XSetWindowBorder (bug#9310).  */
   x_catch_errors (FRAME_X_DISPLAY (f));
   XSetWindowBorderPixmap (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                           f->output_data.x->border_tile);
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
   x_update_cursor (f, 1);
   x_set_frame_alpha (f);
 }
@@ -3765,9 +3765,9 @@ x_get_keysym_name (int keysym)
 {
   char *value;
 
-  BLOCK_INPUT;
+  block_input ();
   value = XKeysymToString (keysym);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return value;
 }
@@ -3897,7 +3897,7 @@ XTmouse_position (FRAME_PTR *fp, int insist, Lisp_Object *bar_window,
 {
   FRAME_PTR f1;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (! NILP (last_mouse_scroll_bar) && insist == 0)
     x_scroll_bar_report_motion (fp, bar_window, part, x, y, timestamp);
@@ -4078,7 +4078,7 @@ XTmouse_position (FRAME_PTR *fp, int insist, Lisp_Object *bar_window,
       }
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -4267,7 +4267,7 @@ x_send_scroll_bar_event (Lisp_Object window, int part, int portion, int whole)
   struct frame *f = XFRAME (w->frame);
   ptrdiff_t i;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Construct a ClientMessage event to send to the frame.  */
   ev->type = ClientMessage;
@@ -4314,7 +4314,7 @@ x_send_scroll_bar_event (Lisp_Object window, int part, int portion, int whole)
      be sent to the client that created the window, and if that
      window no longer exists, no event will be sent.  */
   XSendEvent (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f), False, 0, &event);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -4405,9 +4405,9 @@ xm_scroll_callback (Widget widget, XtPointer client_data, XtPointer call_data)
         int slider_size;
 
         /* Get the slider size.  */
-        BLOCK_INPUT;
+        block_input ();
         XtVaGetValues (widget, XmNsliderSize, &slider_size, NULL);
-        UNBLOCK_INPUT;
+        unblock_input ();
 
         whole = XM_SB_MAX - slider_size;
         portion = min (cs->value, whole);
@@ -4528,9 +4528,9 @@ xaw_jump_callback (Widget widget, XtPointer client_data, XtPointer call_data)
   int part;
 
   /* Get the size of the thumb, a value between 0 and 1.  */
-  BLOCK_INPUT;
+  block_input ();
   XtVaGetValues (widget, XtNshown, &shown, XtNheight, &height, NULL);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   whole = 10000000;
   portion = shown < 1 ? top * whole : 0;
@@ -4570,9 +4570,9 @@ xaw_scroll_callback (Widget widget, XtPointer client_data, XtPointer call_data)
   int part;
 
   /* Get the height of the scroll bar.  */
-  BLOCK_INPUT;
+  block_input ();
   XtVaGetValues (widget, XtNheight, &height, NULL);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (eabs (position) >= height)
     part = (position < 0) ? scroll_bar_above_handle : scroll_bar_below_handle;
@@ -4603,11 +4603,11 @@ x_create_toolkit_scroll_bar (struct frame *f, struct scroll_bar *bar)
 {
   const char *scroll_bar_name = SCROLL_BAR_NAME;
 
-  BLOCK_INPUT;
+  block_input ();
   xg_create_scroll_bar (f, bar, G_CALLBACK (xg_scroll_callback),
                         G_CALLBACK (xg_end_scroll_callback),
                         scroll_bar_name);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 #else /* not USE_GTK */
@@ -4622,7 +4622,7 @@ x_create_toolkit_scroll_bar (struct frame *f, struct scroll_bar *bar)
   const char *scroll_bar_name = SCROLL_BAR_NAME;
   unsigned long pixel;
 
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef USE_MOTIF
   /* Set resources.  Create the widget.  */
@@ -4806,7 +4806,7 @@ x_create_toolkit_scroll_bar (struct frame *f, struct scroll_bar *bar)
   xwindow = XtWindow (widget);
   bar->x_window = xwindow;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 #endif /* not USE_GTK */
 
@@ -4830,7 +4830,7 @@ x_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar, int portion, int positio
   Widget widget = SCROLL_BAR_X_WIDGET (FRAME_X_DISPLAY (f), bar);
   float top, shown;
 
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef USE_MOTIF
 
@@ -4921,7 +4921,7 @@ x_set_toolkit_scroll_bar_thumb (struct scroll_bar *bar, int portion, int positio
   }
 #endif /* !USE_MOTIF */
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 #endif /* not USE_GTK */
 
@@ -4946,7 +4946,7 @@ x_scroll_bar_create (struct window *w, int top, int left, int width, int height)
     = ALLOCATE_PSEUDOVECTOR (struct scroll_bar, x_window, PVEC_OTHER);
   Lisp_Object barobj;
 
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef USE_TOOLKIT_SCROLL_BARS
   x_create_toolkit_scroll_bar (f, bar);
@@ -5034,7 +5034,7 @@ x_scroll_bar_create (struct window *w, int top, int left, int width, int height)
   XMapRaised (FRAME_X_DISPLAY (f), bar->x_window);
 #endif /* not USE_TOOLKIT_SCROLL_BARS */
 
-  UNBLOCK_INPUT;
+  unblock_input ();
   return bar;
 }
 
@@ -5068,7 +5068,7 @@ x_scroll_bar_set_handle (struct scroll_bar *bar, int start, int end, int rebuild
       && end == bar->end)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   {
     int inside_width = VERTICAL_SCROLL_BAR_INSIDE_WIDTH (f, bar->width);
@@ -5144,7 +5144,7 @@ x_scroll_bar_set_handle (struct scroll_bar *bar, int start, int end, int rebuild
 
   }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 #endif /* !USE_TOOLKIT_SCROLL_BARS */
@@ -5156,7 +5156,7 @@ static void
 x_scroll_bar_remove (struct scroll_bar *bar)
 {
   struct frame *f = XFRAME (WINDOW_FRAME (XWINDOW (bar->window)));
-  BLOCK_INPUT;
+  block_input ();
 
 #ifdef USE_TOOLKIT_SCROLL_BARS
 #ifdef USE_GTK
@@ -5171,7 +5171,7 @@ x_scroll_bar_remove (struct scroll_bar *bar)
   /* Dissociate this scroll bar from its window.  */
   wset_vertical_scroll_bar (XWINDOW (bar->window), Qnil);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5239,7 +5239,7 @@ XTset_vertical_scroll_bar (struct window *w, int portion, int whole, int positio
     {
       if (width > 0 && height > 0)
         {
-          BLOCK_INPUT;
+          block_input ();
 #ifdef USE_TOOLKIT_SCROLL_BARS
           if (fringe_extended_p)
             x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
@@ -5248,7 +5248,7 @@ XTset_vertical_scroll_bar (struct window *w, int portion, int whole, int positio
 #endif
             x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                           left, top, width, height, False);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
 
       bar = x_scroll_bar_create (w, top, sb_left, sb_width, height);
@@ -5260,7 +5260,7 @@ XTset_vertical_scroll_bar (struct window *w, int portion, int whole, int positio
 
       bar = XSCROLL_BAR (w->vertical_scroll_bar);
 
-      BLOCK_INPUT;
+      block_input ();
 
       if (sb_left != bar->left)
         mask |= CWX;
@@ -5357,7 +5357,7 @@ XTset_vertical_scroll_bar (struct window *w, int portion, int whole, int positio
       bar->width = sb_width;
       bar->height = height;
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 
 #ifdef USE_TOOLKIT_SCROLL_BARS
@@ -5508,7 +5508,7 @@ x_scroll_bar_expose (struct scroll_bar *bar, XEvent *event)
   GC gc = f->output_data.x->normal_gc;
   int width_trim = VERTICAL_SCROLL_BAR_WIDTH_TRIM;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x_scroll_bar_set_handle (bar, bar->start, bar->end, 1);
 
@@ -5530,7 +5530,7 @@ x_scroll_bar_expose (struct scroll_bar *bar, XEvent *event)
      XSetForeground (FRAME_X_DISPLAY (f), gc,
                      FRAME_FOREGROUND_PIXEL (f));
 
-   UNBLOCK_INPUT;
+   unblock_input ();
 
 }
 #endif /* not USE_TOOLKIT_SCROLL_BARS */
@@ -5643,7 +5643,7 @@ x_scroll_bar_report_motion (FRAME_PTR *fp, Lisp_Object *bar_window,
   int dummy_coord;
   unsigned int dummy_mask;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Get the mouse's position relative to the scroll bar window, and
      report that.  */
@@ -5695,7 +5695,7 @@ x_scroll_bar_report_motion (FRAME_PTR *fp, Lisp_Object *bar_window,
 
   *timestamp = last_mouse_movement_time;
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -5816,7 +5816,7 @@ event_handler_gdk (GdkXEvent *gxev, GdkEvent *ev, gpointer data)
 {
   XEvent *xev = (XEvent *) gxev;
 
-  BLOCK_INPUT;
+  block_input ();
   if (current_count >= 0)
     {
       struct x_display_info *dpyinfo;
@@ -5831,7 +5831,7 @@ event_handler_gdk (GdkXEvent *gxev, GdkEvent *ev, gpointer data)
           && dpyinfo
           && x_filter_event (dpyinfo, xev))
         {
-          UNBLOCK_INPUT;
+          unblock_input ();
           return GDK_FILTER_REMOVE;
         }
 #endif
@@ -5846,7 +5846,7 @@ event_handler_gdk (GdkXEvent *gxev, GdkEvent *ev, gpointer data)
   else
     current_finish = x_dispatch_event (xev, xev->xany.display);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (current_finish == X_EVENT_GOTO_OUT || current_finish == X_EVENT_DROP)
     return GDK_FILTER_REMOVE;
@@ -7041,10 +7041,10 @@ handle_one_xevent (struct x_display_info *dpyinfo, XEvent *eventptr,
     default:
     OTHER:
 #ifdef USE_X_TOOLKIT
-    BLOCK_INPUT;
+      block_input ();
     if (*finish != X_EVENT_DROP)
       XtDispatchEvent (&event);
-    UNBLOCK_INPUT;
+    unblock_input ();
 #endif /* USE_X_TOOLKIT */
     break;
     }
@@ -7122,16 +7122,7 @@ XTread_socket (struct terminal *terminal, struct input_event *hold_quit)
   int count = 0;
   int event_found = 0;
 
-  if (interrupt_input_blocked)
-    {
-      interrupt_input_pending = 1;
-      pending_signals = 1;
-      return -1;
-    }
-
-  interrupt_input_pending = 0;
-  pending_signals = pending_atimers;
-  BLOCK_INPUT;
+  block_input ();
 
   /* So people can tell when we have read the available input.  */
   input_signal_count++;
@@ -7224,7 +7215,7 @@ XTread_socket (struct terminal *terminal, struct input_event *hold_quit)
       pending_autoraise_frame = 0;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return count;
 }
@@ -7660,7 +7651,7 @@ x_uncatch_errors (void)
 {
   struct x_error_message_stack *tmp;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* The display may have been closed before this function is called.
      Check if it is still open before calling XSync.  */
@@ -7670,7 +7661,7 @@ x_uncatch_errors (void)
   tmp = x_error_message;
   x_error_message = x_error_message->prev;
   xfree (tmp);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* If any X protocol errors have arrived since the last call to
@@ -7733,26 +7724,6 @@ x_trace_wire (void)
 #endif /* ! 0 */
 
 
-/* Handle SIGPIPE, which can happen when the connection to a server
-   simply goes away.  SIGPIPE is handled by x_connection_signal.
-   Don't need to do anything, because the write which caused the
-   SIGPIPE will fail, causing Xlib to invoke the X IO error handler,
-   which will do the appropriate cleanup for us.  */
-
-static void
-x_connection_signal (int signalnum)     /* If we don't have an argument, */
-                                /* some compilers complain in signal calls.  */
-{
-#ifdef USG
-  /* USG systems forget handlers when they are used;
-     must reestablish each time */
-  struct sigaction action;
-  emacs_sigaction_init (&action, x_connection_signal);
-  sigaction (signalnum, &action, 0);
-#endif /* USG */
-}
-
-
 /************************************************************************
                           Handling X errors
  ************************************************************************/
@@ -7856,17 +7827,7 @@ For details, see etc/PROBLEMS.\n",
       /* NOTREACHED */
     }
 
-  /* Ordinary stack unwind doesn't deal with these.  */
-  {
-    sigset_t unblocked;
-    sigemptyset (&unblocked);
-#ifdef USABLE_SIGIO
-    sigaddset (&unblocked, SIGIO);
-#endif
-    sigaddset (&unblocked, SIGALRM);
-    pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
-  }
-  TOTALLY_UNBLOCK_INPUT;
+  totally_unblock_input ();
 
   unbind_to (idx, Qnil);
   clear_waiting_for_input ();
@@ -8005,9 +7966,9 @@ x_new_font (struct frame *f, Lisp_Object font_object, int fontset)
   if (FRAME_XIC (f)
       && (FRAME_XIC_STYLE (f) & (XIMPreeditPosition | XIMStatusArea)))
     {
-      BLOCK_INPUT;
+      block_input ();
       xic_set_xfontset (f, SSDATA (fontset_ascii (fontset)));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 #endif
 
@@ -8033,7 +7994,7 @@ xim_destroy_callback (XIM xim, XPointer client_data, XPointer call_data)
   struct x_display_info *dpyinfo = (struct x_display_info *) client_data;
   Lisp_Object frame, tail;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* No need to call XDestroyIC.. */
   FOR_EACH_FRAME (tail, frame)
@@ -8049,7 +8010,7 @@ xim_destroy_callback (XIM xim, XPointer client_data, XPointer call_data)
   /* No need to call XCloseIM.  */
   dpyinfo->xim = NULL;
   XFree (dpyinfo->xim_styles);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 #endif /* HAVE_X11R6 */
@@ -8124,7 +8085,7 @@ xim_instantiate_callback (Display *display, XPointer client_data, XPointer call_
     {
       Lisp_Object tail, frame;
 
-      BLOCK_INPUT;
+      block_input ();
       FOR_EACH_FRAME (tail, frame)
         {
           struct frame *f = XFRAME (frame);
@@ -8144,7 +8105,7 @@ xim_instantiate_callback (Display *display, XPointer client_data, XPointer call_
               }
         }
 
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -8291,7 +8252,7 @@ x_set_offset (struct frame *f, register int xoff, register int yoff, int change_
     }
   x_calc_absolute_position (f);
 
-  BLOCK_INPUT;
+  block_input ();
   x_wm_set_size_hint (f, (long) 0, 0);
 
   modified_left = f->left_pos;
@@ -8330,7 +8291,7 @@ x_set_offset (struct frame *f, register int xoff, register int yoff, int change_
                && FRAME_X_OUTPUT (f)->move_offset_top == 0))))
     x_check_expected_move (f, modified_left, modified_top);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Return non-zero if _NET_SUPPORTING_WM_CHECK window exists and _NET_SUPPORTED
@@ -8353,7 +8314,7 @@ wm_supports (struct frame *f, Atom want_atom)
   unsigned char *tmp_data = NULL;
   Atom target_type = XA_WINDOW;
 
-  BLOCK_INPUT;
+  block_input ();
 
   x_catch_errors (dpy);
   rc = XGetWindowProperty (dpy, target_window,
@@ -8366,7 +8327,7 @@ wm_supports (struct frame *f, Atom want_atom)
     {
       if (tmp_data) XFree (tmp_data);
       x_uncatch_errors ();
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
@@ -8379,7 +8340,7 @@ wm_supports (struct frame *f, Atom want_atom)
   if (x_had_errors_p (dpy))
     {
       x_uncatch_errors ();
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
@@ -8404,7 +8365,7 @@ wm_supports (struct frame *f, Atom want_atom)
         {
           if (tmp_data) XFree (tmp_data);
           x_uncatch_errors ();
-          UNBLOCK_INPUT;
+          unblock_input ();
           return 0;
         }
 
@@ -8419,7 +8380,7 @@ wm_supports (struct frame *f, Atom want_atom)
     rc = dpyinfo->net_supported_atoms[i] == want_atom;
 
   x_uncatch_errors ();
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return rc;
 }
@@ -8478,7 +8439,7 @@ get_current_wm_state (struct frame *f,
   *sticky = 0;
   *size_state = FULLSCREEN_NONE;
 
-  BLOCK_INPUT;
+  block_input ();
   x_catch_errors (dpy);
   rc = XGetWindowProperty (dpy, window, dpyinfo->Xatom_net_wm_state,
                            0, max_len, False, target_type,
@@ -8489,7 +8450,7 @@ get_current_wm_state (struct frame *f,
     {
       if (tmp_data) XFree (tmp_data);
       x_uncatch_errors ();
-      UNBLOCK_INPUT;
+      unblock_input ();
       return ! f->iconified;
     }
 
@@ -8524,7 +8485,7 @@ get_current_wm_state (struct frame *f,
     }
 
   if (tmp_data) XFree (tmp_data);
-  UNBLOCK_INPUT;
+  unblock_input ();
   return ! is_hidden;
 }
 
@@ -8604,10 +8565,10 @@ XTfullscreen_hook (FRAME_PTR f)
 {
   if (f->async_visible)
     {
-      BLOCK_INPUT;
+      block_input ();
       x_check_fullscreen (f);
       x_sync (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -8792,10 +8753,10 @@ x_wait_for_event (struct frame *f, int eventtype)
 
   while (pending_event_wait.eventtype)
     {
-      interrupt_input_pending = 1;
-      TOTALLY_UNBLOCK_INPUT;
+      pending_signals = 1;
+      totally_unblock_input ();
       /* XTread_socket is called after unblock.  */
-      BLOCK_INPUT;
+      block_input ();
       interrupt_input_blocked = level;
 
       FD_ZERO (&fds);
@@ -8886,7 +8847,7 @@ x_set_window_size_1 (struct frame *f, int change_gravity, int cols, int rows)
 void
 x_set_window_size (struct frame *f, int change_gravity, int cols, int rows)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   if (NILP (tip_frame) || XFRAME (tip_frame) != f)
     {
@@ -8934,7 +8895,7 @@ x_set_window_size (struct frame *f, int change_gravity, int cols, int rows)
      so don't try--just let the highlighting be done afresh with new size.  */
   cancel_mouse_face (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Mouse warping.  */
@@ -8953,11 +8914,11 @@ x_set_mouse_position (struct frame *f, int x, int y)
   if (pix_y < 0) pix_y = 0;
   if (pix_y > FRAME_PIXEL_HEIGHT (f)) pix_y = FRAME_PIXEL_HEIGHT (f);
 
-  BLOCK_INPUT;
+  block_input ();
 
   XWarpPointer (FRAME_X_DISPLAY (f), None, FRAME_X_WINDOW (f),
                 0, 0, 0, 0, pix_x, pix_y);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Move the mouse to position pixel PIX_X, PIX_Y relative to frame F.  */
@@ -8965,11 +8926,11 @@ x_set_mouse_position (struct frame *f, int x, int y)
 void
 x_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
 {
-  BLOCK_INPUT;
+  block_input ();
 
   XWarpPointer (FRAME_X_DISPLAY (f), None, FRAME_X_WINDOW (f),
                 0, 0, 0, 0, pix_x, pix_y);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Raise frame F.  */
@@ -8977,12 +8938,12 @@ x_set_mouse_pixel_position (struct frame *f, int pix_x, int pix_y)
 void
 x_raise_frame (struct frame *f)
 {
-  BLOCK_INPUT;
+  block_input ();
   if (f->async_visible)
     XRaiseWindow (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f));
 
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Lower frame F.  */
@@ -8992,10 +8953,10 @@ x_lower_frame (struct frame *f)
 {
   if (f->async_visible)
     {
-      BLOCK_INPUT;
+      block_input ();
       XLowerWindow (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f));
       XFlush (FRAME_X_DISPLAY (f));
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -9104,7 +9065,7 @@ x_make_frame_visible (struct frame *f)
 
  retry:
 
-  BLOCK_INPUT;
+  block_input ();
 
   type = x_icon_type (f);
   if (!NILP (type))
@@ -9163,7 +9124,7 @@ x_make_frame_visible (struct frame *f)
     original_top = f->top_pos;
 
     /* This must come after we set COUNT.  */
-    UNBLOCK_INPUT;
+    unblock_input ();
 
     /* We unblock here so that arriving X events are processed.  */
 
@@ -9186,7 +9147,7 @@ x_make_frame_visible (struct frame *f)
         int x, y;
         unsigned int width, height, border, depth;
 
-        BLOCK_INPUT;
+        block_input ();
 
         /* On some window managers (such as FVWM) moving an existing
            window, even to the same place, causes the window manager
@@ -9202,7 +9163,7 @@ x_make_frame_visible (struct frame *f)
           XMoveWindow (FRAME_X_DISPLAY (f), FRAME_OUTER_WINDOW (f),
                        original_left, original_top);
 
-        UNBLOCK_INPUT;
+        unblock_input ();
       }
 
     XSETFRAME (frame, f);
@@ -9269,7 +9230,7 @@ x_make_frame_invisible (struct frame *f)
   if (FRAME_X_DISPLAY_INFO (f)->x_highlight_frame == f)
     FRAME_X_DISPLAY_INFO (f)->x_highlight_frame = 0;
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* Before unmapping the window, update the WM_SIZE_HINTS property to claim
      that the current position of the window is user-specified, rather than
@@ -9292,7 +9253,7 @@ x_make_frame_invisible (struct frame *f)
   if (! XWithdrawWindow (FRAME_X_DISPLAY (f), window,
                          DefaultScreen (FRAME_X_DISPLAY (f))))
     {
-      UNBLOCK_INPUT_RESIGNAL;
+      unblock_input ();
       error ("Can't notify window manager of window withdrawal");
     }
   }
@@ -9309,7 +9270,7 @@ x_make_frame_invisible (struct frame *f)
 
   x_sync (f);
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Change window state from mapped to iconified.  */
@@ -9329,7 +9290,7 @@ x_iconify_frame (struct frame *f)
   if (f->async_iconified)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 
   FRAME_SAMPLE_VISIBILITY (f);
 
@@ -9348,7 +9309,7 @@ x_iconify_frame (struct frame *f)
       f->visible = 1;
       f->async_iconified = 1;
       f->async_visible = 0;
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 #endif
@@ -9368,14 +9329,14 @@ x_iconify_frame (struct frame *f)
       f->visible = 1;
       f->async_iconified = 1;
       f->async_visible = 0;
-      UNBLOCK_INPUT;
+      unblock_input ();
       return;
     }
 
   result = XIconifyWindow (FRAME_X_DISPLAY (f),
                            XtWindow (f->output_data.x->widget),
                            DefaultScreen (FRAME_X_DISPLAY (f)));
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   if (!result)
     error ("Can't notify window manager of iconification");
@@ -9384,9 +9345,9 @@ x_iconify_frame (struct frame *f)
   f->async_visible = 0;
 
 
-  BLOCK_INPUT;
+  block_input ();
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 #else /* not USE_X_TOOLKIT */
 
   /* Make sure the X server knows where the window should be positioned,
@@ -9416,7 +9377,7 @@ x_iconify_frame (struct frame *f)
                       SubstructureRedirectMask | SubstructureNotifyMask,
                       &msg))
       {
-        UNBLOCK_INPUT_RESIGNAL;
+        unblock_input ();
         error ("Can't notify window manager of iconification");
       }
   }
@@ -9435,7 +9396,7 @@ x_iconify_frame (struct frame *f)
   f->async_visible = 0;
 
   XFlush (FRAME_X_DISPLAY (f));
-  UNBLOCK_INPUT;
+  unblock_input ();
 #endif /* not USE_X_TOOLKIT */
 }
 
@@ -9452,7 +9413,7 @@ x_free_frame_resources (struct frame *f)
   struct scroll_bar *b;
 #endif
 
-  BLOCK_INPUT;
+  block_input ();
 
   /* If a display connection is dead, don't try sending more
      commands to the X server.  */
@@ -9555,7 +9516,7 @@ x_free_frame_resources (struct frame *f)
       hlinfo->mouse_face_mouse_frame = 0;
     }
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 
@@ -9580,13 +9541,13 @@ x_destroy_window (struct frame *f)
 /* Set the normal size hints for the window manager, for frame F.
    FLAGS is the flags word to use--or 0 meaning preserve the flags
    that the window now has.
-   If USER_POSITION is nonzero, we set the USPosition
+   If USER_POSITION, set the USPosition
    flag (this is useful when FLAGS is 0).
-   The GTK version is in gtkutils.c  */
+   The GTK version is in gtkutils.c.  */
 
 #ifndef USE_GTK
 void
-x_wm_set_size_hint (struct frame *f, long flags, int user_position)
+x_wm_set_size_hint (struct frame *f, long flags, bool user_position)
 {
   XSizeHints size_hints;
   Window window = FRAME_OUTER_WINDOW (f);
@@ -9935,7 +9896,7 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
   Mouse_HLInfo *hlinfo;
   ptrdiff_t lim;
 
-  BLOCK_INPUT;
+  block_input ();
 
   if (!x_initialized)
     {
@@ -9996,11 +9957,13 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
            Call before gtk_init so Gtk+ event filters comes after our.  */
         gdk_window_add_filter (NULL, event_handler_gdk, NULL);
 
+        /* gtk_init does set_locale.  Fix locale before and after.  */
+        fixup_locale ();
         gtk_init (&argc, &argv2);
+        fixup_locale ();
+
         g_log_remove_handler ("GLib", id);
 
-        /* gtk_init does set_locale.  We must fix locale after calling it.  */
-        fixup_locale ();
         xg_initialize ();
 
         dpy = DEFAULT_GDK_DISPLAY ();
@@ -10067,7 +10030,7 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
   /* Detect failure.  */
   if (dpy == 0)
     {
-      UNBLOCK_INPUT;
+      unblock_input ();
       return 0;
     }
 
@@ -10114,12 +10077,12 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
 
             /* Temporarily hide the partially initialized terminal.  */
             terminal_list = terminal->next_terminal;
-            UNBLOCK_INPUT;
+            unblock_input ();
             kset_system_key_alist
               (terminal->kboard,
                call1 (Qvendor_specific_keysyms,
                       vendor ? build_string (vendor) : empty_unibyte_string));
-            BLOCK_INPUT;
+            block_input ();
             terminal->next_terminal = terminal_list;
             terminal_list = terminal;
             UNGCPRO;
@@ -10468,7 +10431,7 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
     x_session_initialize (dpyinfo);
 #endif
 
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   return dpyinfo;
 }
@@ -10548,7 +10511,7 @@ x_delete_display (struct x_display_info *dpyinfo)
 static void
 x_process_timeouts (struct atimer *timer)
 {
-  BLOCK_INPUT;
+  block_input ();
   x_timeout_atimer_activated_flag = 0;
   if (toolkit_scroll_bar_interaction || popup_activated ())
     {
@@ -10557,7 +10520,7 @@ x_process_timeouts (struct atimer *timer)
       /* Reactivate the atimer for next time.  */
       x_activate_timeout_atimer ();
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Install an asynchronous timer that processes Xt timeout events
@@ -10571,14 +10534,14 @@ x_process_timeouts (struct atimer *timer)
 void
 x_activate_timeout_atimer (void)
 {
-  BLOCK_INPUT;
+  block_input ();
   if (!x_timeout_atimer_activated_flag)
     {
       EMACS_TIME interval = make_emacs_time (0, 100 * 1000 * 1000);
       start_atimer (ATIMER_RELATIVE, interval, x_process_timeouts, 0);
       x_timeout_atimer_activated_flag = 1;
     }
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 #endif /* USE_X_TOOLKIT */
@@ -10631,7 +10594,7 @@ x_delete_terminal (struct terminal *terminal)
   if (!terminal->name)
     return;
 
-  BLOCK_INPUT;
+  block_input ();
 #ifdef HAVE_X_I18N
   /* We must close our connection to the XIM server before closing the
      X display.  */
@@ -10686,7 +10649,7 @@ x_delete_terminal (struct terminal *terminal)
   /* Mark as dead. */
   dpyinfo->display = NULL;
   x_delete_display (dpyinfo);
-  UNBLOCK_INPUT;
+  unblock_input ();
 }
 
 /* Create a struct terminal, initialize it with the X11 specific
@@ -10743,8 +10706,6 @@ x_create_terminal (struct x_display_info *dpyinfo)
 void
 x_initialize (void)
 {
-  struct sigaction action;
-
   baud_rate = 19200;
 
   x_noop_count = 0;
@@ -10790,9 +10751,6 @@ x_initialize (void)
      original error handler.  */
   XSetErrorHandler (x_error_handler);
   XSetIOErrorHandler (x_io_error_quitter);
-
-  emacs_sigaction_init (&action, x_connection_signal);
-  sigaction (SIGPIPE, &action, 0);
 }
 
 
diff --git a/src/xterm.h b/src/xterm.h
index 2d718f49118..4bc8f9813ed 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -962,11 +962,11 @@ extern XtAppContext Xt_app_con;
 extern void x_activate_timeout_atimer (void);
 #endif
 #ifdef USE_LUCID
-extern int x_alloc_lighter_color_for_widget (Widget, Display *, Colormap,
-                                             unsigned long *,
-                                             double, int);
+extern bool x_alloc_lighter_color_for_widget (Widget, Display *, Colormap,
+                                              unsigned long *,
+                                              double, int);
 #endif
-extern int x_alloc_nearest_color (struct frame *, Colormap, XColor *);
+extern bool x_alloc_nearest_color (struct frame *, Colormap, XColor *);
 extern void x_query_color (struct frame *f, XColor *);
 extern void x_clear_area (Display *, Window, int, int, int, int, int);
 #if defined HAVE_MENUS && !defined USE_X_TOOLKIT && !defined USE_GTK
@@ -1034,7 +1034,7 @@ extern void xic_set_statusarea (struct frame *);
 extern void xic_set_xfontset (struct frame *, const char *);
 extern int x_pixel_width (struct frame *);
 extern int x_pixel_height (struct frame *);
-extern int x_defined_color (struct frame *, const char *, XColor *, int);
+extern bool x_defined_color (struct frame *, const char *, XColor *, bool);
 #ifdef HAVE_X_I18N
 extern void free_frame_xic (struct frame *);
 # if defined HAVE_X_WINDOWS && defined USE_X_TOOLKIT