(x_make_frame_visible): Call signal handler directly.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/xterm.c b/src/xterm.c
index a900a6e15dd..73515ff3174 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -5673,10 +5673,15 @@ x_make_frame_visible (f)
       {
         x_sync (frame);
         /* Machines that do polling rather than SIGIO have been observed
-           to go into a busy-wait here.  Send the alarm signal to let
-           the handler know that there's something to be read.  */
+           to go into a busy-wait here.  So we'll fake an alarm signal
+           to let the handler know that there's something to be read.
+           We used to raise a real alarm, but it seems that the handler
+           isn't always enabled here.  This is probably a bug.  */
 #ifndef SIGIO
-        kill (getpid(), SIGALRM);
+        /* It could be confusing if a real alarm arrives while processing
+           the fake one.  Turn it off and let the handler reset it.  */
+        alarm (0);
+        input_poll_signal ();
 #endif
       }
     FRAME_SAMPLE_VISIBILITY (f);