Fix bug #9087 with crashes on MS-Windows under throw-on-input.

 src/w32fns.c (signal_user_input): Don't do a QUIT, to avoid
 thrashing the stack of the thread.

2 files changed, 10 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 28910c5a556..eb03ef1357f 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2012-01-14  Eli Zaretskii  <eliz@gnu.org>
+
+        * w32fns.c (signal_user_input): Don't do a QUIT, to avoid
+        thrashing the stack of the thread.  (Bug#9087)
+
 2012-01-12  Paul Eggert  <eggert@cs.ucla.edu>
 
         * xdisp.c (rows_from_pos_range): Add parens as per gcc -Wparentheses.
diff --git a/src/w32fns.c b/src/w32fns.c
index 1fcf29fbcfd..510d1e94f16 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -2479,6 +2479,10 @@ signal_user_input (void)
   if (!NILP (Vthrow_on_input))
     {
       Vquit_flag = Vthrow_on_input;
+      /* Doing a QUIT from this thread is a bad idea, since this
+         unwinds the stack of the Lisp thread, and the Windows runtime
+         rightfully barfs.  Disabled.  */
+#if 0
       /* If we're inside a function that wants immediate quits,
          do it now.  */
       if (immediate_quit && NILP (Vinhibit_quit))
@@ -2486,6 +2490,7 @@ signal_user_input (void)
           immediate_quit = 0;
           QUIT;
         }
+#endif
     }
 }