Make sure reload updates SLA config

Even if there are no stations or trunks defined, we need to start the sla
thread to make sure we get the reload event. Also, when doing a reload we need
to remove the existing trunks and stations or they end up hanging around.

(closes issue #16818)
Reported by: mbonin
Patches: 
      sla_reload.patch uploaded by twilson (license 396)
Tested by: twilson


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@272109 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -5675,6 +5675,19 @@ static void sla_check_reload(void)
 		return;
 	}
 
+	/* We need to actually delete the previous versions of trunks and stations now */
+	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&sla_stations, station, entry) {
+		AST_RWLIST_REMOVE_CURRENT(entry);
+		ast_free(station);
+	}
+	AST_RWLIST_TRAVERSE_SAFE_END;
+
+	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&sla_trunks, trunk, entry) {
+		AST_RWLIST_REMOVE_CURRENT(entry);
+		ast_free(trunk);
+	}
+	AST_RWLIST_TRAVERSE_SAFE_END;
+
 	/* yay */
 	sla_load_config(1);
 	sla.reload = 0;
@@ -5727,8 +5740,9 @@ static void *sla_thread(void *data)
 			ast_mutex_lock(&sla.lock);
 		}
 
-		if (sla.reload)
+		if (sla.reload) {
 			sla_check_reload();
+		}
 	}
 
 	ast_mutex_unlock(&sla.lock);
@@ -6599,8 +6613,11 @@ static int sla_load_config(int reload)
 
 	ast_config_destroy(cfg);
 
-	if (!reload && (!AST_LIST_EMPTY(&sla_stations) || !AST_LIST_EMPTY(&sla_stations)))
+	/* Even if we don't have any stations, we may after a reload and we need to
+	 * be able to process the SLA_EVENT_RELOAD event in that case */
+	if (!reload) {
 		ast_pthread_create(&sla.thread, NULL, sla_thread, NULL);
+	}
 
 	return res;
 }