Ensure manager hooks are executed when there are no manager sessions.

Conditional expanded to check for hooks before aborting manager event
processing. The other two changes are just optimizations.

(closes issue #16455)
Reported by: atis
Patches:
     manager_hooks_16.patch uploaded by atis (license 242)
Tested by: atis


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@243988 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/manager.c

@@ -3283,8 +3283,8 @@ int __manager_event(int category, const char *event,
 	struct timeval now;
 	struct ast_str *buf;
 
-	/* Abort if there aren't any manager sessions */
-	if (!num_sessions)
+	/* Abort if there are neither any manager sessions nor hooks */
+	if (!num_sessions && AST_RWLIST_EMPTY(&manager_hooks))
 		return 0;
 
 	if (!(buf = ast_str_thread_get(&manager_event_buf, MANAGER_EVENT_BUF_INITSIZE)))
@@ -3319,27 +3319,31 @@ int __manager_event(int category, const char *event,
 	append_event(buf->str, category);
 
 	/* Wake up any sleeping sessions */
-	AST_LIST_LOCK(&sessions);
-	AST_LIST_TRAVERSE(&sessions, session, list) {
-		ast_mutex_lock(&session->__lock);
-		if (session->waiting_thread != AST_PTHREADT_NULL)
-			pthread_kill(session->waiting_thread, SIGURG);
-		else
-			/* We have an event to process, but the mansession is
-			 * not waiting for it. We still need to indicate that there
-			 * is an event waiting so that get_input processes the pending
-			 * event instead of polling.
-			 */
-			session->pending_event = 1;
-		ast_mutex_unlock(&session->__lock);
+	if (num_sessions) {
+		AST_LIST_LOCK(&sessions);
+		AST_LIST_TRAVERSE(&sessions, session, list) {
+			ast_mutex_lock(&session->__lock);
+			if (session->waiting_thread != AST_PTHREADT_NULL)
+				pthread_kill(session->waiting_thread, SIGURG);
+			else
+				/* We have an event to process, but the mansession is
+				 * not waiting for it. We still need to indicate that there
+				 * is an event waiting so that get_input processes the pending
+				 * event instead of polling.
+				 */
+				session->pending_event = 1;
+			ast_mutex_unlock(&session->__lock);
+		}
+		AST_LIST_UNLOCK(&sessions);
 	}
-	AST_LIST_UNLOCK(&sessions);
 
-	AST_RWLIST_RDLOCK(&manager_hooks);
-	AST_RWLIST_TRAVERSE(&manager_hooks, hook, list) {
-		hook->helper(category, event, buf->str);
+	if (!AST_RWLIST_EMPTY(&manager_hooks)) {
+		AST_RWLIST_RDLOCK(&manager_hooks);
+		AST_RWLIST_TRAVERSE(&manager_hooks, hook, list) {
+			hook->helper(category, event, buf->str);
+		}
+		AST_RWLIST_UNLOCK(&manager_hooks);
 	}
-	AST_RWLIST_UNLOCK(&manager_hooks);
 
 	return 0;
 }