Run the event loop once after adding a new signal event to the event library. Events are only processed at the start of an event loop (not at event add), so there was a window of time between event_add() and event_loop() for the signal event in which the event existed, but was not active. During this window, signals that should have triggered a callback could be lost.

Reviewed by Jeff and Tim.

This commit was SVN r5715.

src/event/signal.c

@@ -119,6 +119,12 @@ ompi_evsignal_add(sigset_t *evsigmask, struct ompi_event *ev)
 		errx(1, "%s: OMPI_EV_SIGNAL incompatible use", __func__);
 	evsignal = OMPI_EVENT_SIGNAL(ev);
 
+#if OMPI_ENABLE_PROGRESS_THREADS
+        if (!ompi_using_threads()) ompi_event_loop(OMPI_EVLOOP_NONBLOCK);
+#else
+        ompi_event_loop(OMPI_EVLOOP_NONBLOCK);
+#endif
+
 #ifndef WIN32
 	sigaddset(evsigmask, evsignal);
 #endif