Call SIGNAL_THREAD_CHECK from signal handlers.

* keyboard.c (input_available_signal) [SYNC_INPUT]:
Call SIGNAL_THREAD_CHECK (Bug#5333).

* atimer.c (alarm_signal_handler) [!SYNC_INPUT]:
Call SIGNAL_THREAD_CHECK.

src/ChangeLog

+2010-01-13  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+	* keyboard.c (input_available_signal) [SYNC_INPUT]:
+	Call SIGNAL_THREAD_CHECK (Bug#5333).
+
+	* atimer.c (alarm_signal_handler) [!SYNC_INPUT]:
+	Call SIGNAL_THREAD_CHECK.
+
 2010-01-13  Stefan Monnier  <monnier@iro.umontreal.ca>
 	Try to fix bug#5314.  This is probably not the final word, tho.

src/atimer.c

@@ -410,6 +410,10 @@ SIGTYPE
 alarm_signal_handler (signo)
      int signo;
 {
+#ifndef SYNC_INPUT
+  SIGNAL_THREAD_CHECK (signo);
+#endif
+
   pending_atimers = 1;
 #ifdef SYNC_INPUT
   pending_signals = 1;

src/keyboard.c

@@ -7513,11 +7513,11 @@ input_available_signal (signo)
   signal (signo, input_available_signal);
 #endif /* USG */
 
+  SIGNAL_THREAD_CHECK (signo);
+
 #ifdef SYNC_INPUT
   interrupt_input_pending = 1;
   pending_signals = 1;
-#else
-  SIGNAL_THREAD_CHECK (signo);
 #endif
 
   if (input_available_clear_time)