apply Pierre's fix of using pthread_kill instead of raise in the signal handler

Author: dgrove-oss

src/event/event_epoll.c

@@ -117,6 +117,8 @@ _dispatch_muxnote_dispose(dispatch_muxnote_t dmn)
 	free(dmn);
 }
 
+static pthread_t manager_thread;
+
 static void
 _dispatch_muxnote_signal_block_and_raise(int signo)
 {
@@ -125,7 +127,7 @@ _dispatch_muxnote_signal_block_and_raise(int signo)
 	// receive them.  Fix that by lazily noticing, blocking said signal,
 	// and raising the signal again when it happens
 	_dispatch_sigmask();
-	raise(signo);
+	pthread_kill(manager_thread, signo);
 }
 
 static dispatch_muxnote_t
@@ -147,6 +149,7 @@ _dispatch_muxnote_create(dispatch_unote_t du, uint32_t events)
 	switch (filter) {
 	case EVFILT_SIGNAL:
 		if (!sigismember(&signals_with_unotes, du._du->du_ident)) {
+			manager_thread = pthread_self();
 			sigaddset(&signals_with_unotes, du._du->du_ident);
 			sigaction(du._du->du_ident, &sa, NULL);
 		}