Remove EMACS_OUTQSIZE+sleep hack.

* dispnew.c (update_frame_1): Remove hack for terminals slower
than 2400 bps, which throttled Emacs by having it sleep.  This
code hasn't worked since at least 2007, when the multi-tty stuff
was added, and anyway those old terminals are long dead.
* systty.h (EMACS_OUTQSIZE): Remove; unused.  The macro isn't used even
without the dispnew.c change, as dispnew.c doesn't include systty.h.

3 files changed, 9 insertions, 26 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 3356c9874cc..75b70ee4752 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,13 @@
 2012-11-04  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Remove EMACS_OUTQSIZE+sleep hack.
+        * dispnew.c (update_frame_1): Remove hack for terminals slower
+        than 2400 bps, which throttled Emacs by having it sleep.  This
+        code hasn't worked since at least 2007, when the multi-tty stuff
+        was added, and anyway those old terminals are long dead.
+        * systty.h (EMACS_OUTQSIZE): Remove; unused.  The macro isn't used even
+        without the dispnew.c change, as dispnew.c doesn't include systty.h.
+
         Fix data-loss with --version (Bug#9574).
         * emacs.c (close_output_streams): Use strerror, not emacs_strerror,
         as we can't assume that emacs_strerror is initialized, and strerror
diff --git a/src/dispnew.c b/src/dispnew.c
index e99387d2f6e..2ddd29139af 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -4650,21 +4650,7 @@ update_frame_1 (struct frame *f, bool force_p, bool inhibit_id_p)
                   int outq = PENDING_OUTPUT_COUNT (display_output);
                   if (outq > 900
                       || (outq > 20 && ((i - 1) % preempt_count == 0)))
-                    {
-                      fflush (display_output);
-                      if (preempt_count == 1)
-                        {
-#ifdef EMACS_OUTQSIZE
-                          if (EMACS_OUTQSIZE (0, &outq) < 0)
-                            /* Probably not a tty.  Ignore the error and reset
-                               the outq count.  */
-                            outq = PENDING_OUTPUT_COUNT (FRAME_TTY (f->output));
-#endif
-                          outq *= 10;
-                          if (baud_rate <= outq && baud_rate > 0)
-                            sleep (outq / baud_rate);
-                        }
-                    }
+                    fflush (display_output);
                 }
             }
 
diff --git a/src/systty.h b/src/systty.h
index b7f36c6c259..0611511d901 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -52,17 +52,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif /* not CDEL */
 #endif /* not _POSIX_VDISABLE */
 
-/* Get the number of characters queued for output.  */
-
-/* EMACS_OUTQSIZE(FD, int *SIZE) stores the number of characters
-   queued for output to the terminal FD in *SIZE, if FD is a tty.
-   Returns -1 if there was an error (i.e. FD is not a tty), 0
-   otherwise.  */
-#ifdef TIOCOUTQ
-#define EMACS_OUTQSIZE(fd, size) (ioctl ((fd), TIOCOUTQ, (size)))
-#endif
-
-
 /* Manipulate a terminal's current process group.  */
 
 /* EMACS_GETPGRP (arg) returns the process group of the process.  */