Merged revisions 81158 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r81158 | mmichelson | 2007-08-27 17:40:19 -0500 (Mon, 27 Aug 2007) | 5 lines

Resolve a potential deadlock. In this case, a single queue is locked, then the queue list. In changethread(), the queue list is
locked, and then each individual queue is locked. Under the right circumstances, this could deadlock. As such, I have unlocked
the individual queue before locking the queue list, and then locked the queue back after the queue list is unlocked.


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@81159 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -1198,7 +1198,9 @@ static struct call_queue *find_queue_by_name_rt(const char *queuename, struct as
 			} else {
 				q->members = next_m;
 			}
+			ast_mutex_unlock(&q->lock);
 			remove_from_interfaces(m->interface);
+			ast_mutex_lock(&q->lock);
 			q->membercount--;
 			ast_free(m);
 		} else {
@@ -1300,7 +1302,9 @@ static void update_realtime_members(struct call_queue *q)
 			} else {
 				q->members = next_m;
 			}
+			ast_mutex_unlock(&q->lock);
 			remove_from_interfaces(m->interface);
+			ast_mutex_lock(&q->lock);
 			q->membercount--;
 			free(m);
 		} else {