diff -r 28c1f8480090 Modules/signalmodule.c
--- a/Modules/signalmodule.c	Tue May 24 14:01:39 2011 +0200
+++ b/Modules/signalmodule.c	Tue May 24 18:08:33 2011 +0200
@@ -177,17 +177,18 @@
 trip_signal(int sig_num)
 {
     unsigned char byte;
+
     Handlers[sig_num].tripped = 1;
+    if (wakeup_fd != -1) {
+        byte = (unsigned char)sig_num;
+        write(wakeup_fd, &byte, 1);
+    }
     if (is_tripped)
         return;
     /* Set is_tripped after setting .tripped, as it gets
        cleared in PyErr_CheckSignals() before .tripped. */
     is_tripped = 1;
     Py_AddPendingCall(checksignals_witharg, NULL);
-    if (wakeup_fd != -1) {
-        byte = (unsigned char)sig_num;
-        write(wakeup_fd, &byte, 1);
-    }
 }
 
 static void