3 files changed, 26 insertions, 10 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 41f2467664b..ed2059ebd37 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,13 @@
+2008-05-14  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+        * emacs.c (main_thread): Conditionalize on
+        FORWARD_SIGNAL_TO_MAIN_THREAD instead of HAVE_GTK_AND_PTHREAD.
+        (main) [FORWARD_SIGNAL_TO_MAIN_THREAD]: Initialize it.
+
+        * syssignal.h (FORWARD_SIGNAL_TO_MAIN_THREAD): New define.
+        (main_thread, SIGNAL_THREAD_CHECK): Conditionalize on
+        FORWARD_SIGNAL_TO_MAIN_THREAD instead of HAVE_GTK_AND_PTHREAD.
+
 2008-05-14  Kenichi Handa  <handa@m17n.org>
 
         * coding.c (detect_coding_iso_2022): Ignore a coding category that
diff --git a/src/emacs.c b/src/emacs.c
index 7074076cf66..c401afafbd7 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -355,10 +355,10 @@ int fatal_error_in_progress;
 
 void (*fatal_error_signal_hook) P_ ((void));
 
-#ifdef HAVE_GTK_AND_PTHREAD
-/* When compiled with GTK and running under Gnome, multiple threads may be
-   created.  Keep track of our main thread to make sure signals are delivered
-   to it (see syssignal.h).  */
+#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
+/* When compiled with GTK and running under Gnome, or Carbon under Mac
+   OS X, multiple threads may be created.  Keep track of our main
+   thread to make sure signals are delivered to it (see syssignal.h).  */
 
 pthread_t main_thread;
 #endif
@@ -1035,9 +1035,9 @@ main (argc, argv
 # endif /* not SYNC_INPUT */
 #endif  /* not SYSTEM_MALLOC */
 
-#ifdef HAVE_GTK_AND_PTHREAD
+#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
   main_thread = pthread_self ();
-#endif /* HAVE_GTK_AND_PTHREAD */
+#endif /* FORWARD_SIGNAL_TO_MAIN_THREAD */
 
 #if defined (MSDOS) || defined (WINDOWSNT)
   /* We do all file input/output as binary files.  When we need to translate
diff --git a/src/syssignal.h b/src/syssignal.h
index 53877ca107d..0ab4598b507 100644
--- a/src/syssignal.h
+++ b/src/syssignal.h
@@ -21,8 +21,14 @@ Boston, MA 02110-1301, USA.  */
 
 extern void init_signals P_ ((void));
 
-#ifdef HAVE_GTK_AND_PTHREAD
+#if defined (HAVE_GTK_AND_PTHREAD) || (defined (HAVE_CARBON) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1020)
 #include <pthread.h>
+/* If defined, asynchronous signals delivered to a non-main thread are
+   forwarded to the main thread.  */
+#define FORWARD_SIGNAL_TO_MAIN_THREAD
+#endif
+
+#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
 extern pthread_t main_thread;
 #endif
 
@@ -208,7 +214,7 @@ extern SIGMASKTYPE sigprocmask_set;
 char *strsignal ();
 #endif
 
-#ifdef HAVE_GTK_AND_PTHREAD
+#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
 #define SIGNAL_THREAD_CHECK(signo)                                      \
   do {                                                                  \
     if (!pthread_equal (pthread_self (), main_thread))                  \
@@ -227,8 +233,8 @@ char *strsignal ();
       }                                                                 \
    } while (0)
 
-#else /* not HAVE_GTK_AND_PTHREAD */
+#else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */
 #define SIGNAL_THREAD_CHECK(signo)
-#endif /* not HAVE_GTK_AND_PTHREAD */
+#endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */
 /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152
    (do not change this comment) */