pbx_dundi.c: Handle thread shutdown better.

Change-Id: Id52f99bd6a948fe6dd82acc0a28b2447a224fe87

pbx/pbx_dundi.c

@@ -2198,7 +2198,6 @@ static void *network_thread(void *ignore)
 	}
 
 	ast_io_remove(io, socket_read_id);
-	netthreadid = AST_PTHREADT_NULL;
 
 	return NULL;
 }
@@ -2233,7 +2232,6 @@ static void *process_clearcache(void *ignore)
 		pthread_testcancel();
 	}
 
-	clearcachethreadid = AST_PTHREADT_NULL;
 	return NULL;
 }
 
@@ -2269,8 +2267,6 @@ static void *process_precache(void *ign)
 			sleep(1);
 	}
 
-	precachethreadid = AST_PTHREADT_NULL;
-
 	return NULL;
 }
 
@@ -4957,8 +4953,6 @@ static int set_config(char *config_file, struct sockaddr_in* sin, int reload)
 
 static int unload_module(void)
 {
-	pthread_t previous_netthreadid = netthreadid, previous_precachethreadid = precachethreadid, previous_clearcachethreadid = clearcachethreadid;
-
 	ast_cli_unregister_multiple(cli_dundi, ARRAY_LEN(cli_dundi));
 	ast_unregister_switch(&dundi_switch);
 	ast_custom_function_unregister(&dundi_function);
@@ -4967,17 +4961,20 @@ static int unload_module(void)
 
 	/* Stop all currently running threads */
 	dundi_shutdown = 1;
-	if (previous_netthreadid != AST_PTHREADT_NULL) {
-		pthread_kill(previous_netthreadid, SIGURG);
-		pthread_join(previous_netthreadid, NULL);
-	}
-	if (previous_precachethreadid != AST_PTHREADT_NULL) {
-		pthread_kill(previous_precachethreadid, SIGURG);
-		pthread_join(previous_precachethreadid, NULL);
-	}
- 	if (previous_clearcachethreadid != AST_PTHREADT_NULL) {
- 		pthread_cancel(previous_clearcachethreadid);
- 		pthread_join(previous_clearcachethreadid, NULL);
+	if (netthreadid != AST_PTHREADT_NULL) {
+		pthread_kill(netthreadid, SIGURG);
+		pthread_join(netthreadid, NULL);
+		netthreadid = AST_PTHREADT_NULL;
+	}
+	if (precachethreadid != AST_PTHREADT_NULL) {
+		pthread_kill(precachethreadid, SIGURG);
+		pthread_join(precachethreadid, NULL);
+		precachethreadid = AST_PTHREADT_NULL;
+	}
+ 	if (clearcachethreadid != AST_PTHREADT_NULL) {
+ 		pthread_cancel(clearcachethreadid);
+ 		pthread_join(clearcachethreadid, NULL);
+		clearcachethreadid = AST_PTHREADT_NULL;
  	}
 
 	close(netsocket);