Index: res/res_musiconhold.c
===================================================================
--- res/res_musiconhold.c	(revision 19395)
+++ res/res_musiconhold.c	(working copy)
@@ -166,6 +166,10 @@
 		members = members->next;
 		free(mtmp);
 	}
+	if ((*class)->thread) {
+		pthread_cancel((*class)->thread);
+		(*class)->thread = 0;
+	}
 	free(*class);
 	*class = NULL;
 }
@@ -482,17 +486,20 @@
 	tv.tv_sec = 0;
 	tv.tv_usec = 0;
 	for(;/* ever */;) {
+		pthread_testcancel();
 		/* Spawn mp3 player if it's not there */
 		if (class->srcfd < 0) {
 			if ((class->srcfd = spawn_mp3(class)) < 0) {
 				ast_log(LOG_WARNING, "Unable to spawn mp3player\n");
 				/* Try again later */
 				sleep(500);
+				pthread_testcancel();
 			}
 		}
 		if (class->pseudofd > -1) {
 			/* Pause some amount of time */
 			res = read(class->pseudofd, buf, sizeof(buf));
+			pthread_testcancel();
 		} else {
 			long delta;
 			/* Reliable sleep */
@@ -503,6 +510,7 @@
 			if (delta < MOH_MS_INTERVAL) {	/* too early */
 				tv = ast_tvadd(tv, ast_samp2tv(MOH_MS_INTERVAL, 1000));	/* next deadline */
 				usleep(1000 * (MOH_MS_INTERVAL - delta));
+				pthread_testcancel();
 			} else {
 				ast_log(LOG_NOTICE, "Request to schedule in the past?!?!\n");
 				tv = tv_tmp;
@@ -518,7 +526,12 @@
 			if (!res2) {
 				close(class->srcfd);
 				class->srcfd = -1;
+				pthread_testcancel();
 				if (class->pid) {
+					kill(class->pid, SIGHUP);
+					usleep(100000);
+					kill(class->pid, SIGTERM);
+					usleep(100000);
 					kill(class->pid, SIGKILL);
 					class->pid = 0;
 				}
@@ -526,6 +539,7 @@
 				ast_log(LOG_DEBUG, "Read %d bytes of audio while expecting %d\n", res2, len);
 			continue;
 		}
+		pthread_testcancel();
 		ast_mutex_lock(&moh_lock);
 		moh = class->members;
 		while (moh) {
@@ -1078,6 +1092,13 @@
 			stime = time(NULL) + 2;
 			pid = moh->pid;
 			moh->pid = 0;
+			/* Back when this was just mpg123, SIGKILL was fine.  Now we need
+			 * to give the process a reason and time enough to kill off its
+			 * children. */
+			kill(pid, SIGHUP);
+			usleep(100000);
+			kill(pid, SIGTERM);
+			usleep(100000);
 			kill(pid, SIGKILL);
 			while ((ast_wait_for_input(moh->srcfd, 100) > 0) && (bytes = read(moh->srcfd, buff, 8192)) && time(NULL) < stime) {
 				tbytes = tbytes + bytes;