19.同一线程加锁是没有效果的,多线程加锁才能起作用

同一线程加锁是没有效果的,多线程加锁才能起作用

 dispatch_async(dispatch_get_global_queue(0, 0), ^{
                @synchronized (kFeedBackLock) {
                    if ([bodyDict containsObjectForKey:@"conversineType"] && [bodyDict containsObjectForKey:@"ackId"]) {
                        NSInteger type = [bodyDict[@"conversineType"] integerValue];
                        // NSUserDefaults 线程安全  保存信息, 每隔30s向后台发送回执
                        if (type == NFConversineTypePrivite) {  // 私聊
                            [self saveFeedBackListWithBodyDict:bodyDict chatKey:kSingleChatKey];
                        } else if (type == NFConversineTypeGroup) { // 群聊
                            [self saveFeedBackListWithBodyDict:bodyDict chatKey:kGroupChatKey];
                        } else if (type == NFConversineTypeSystem) { // 系统消息
                            NSLog(@"信息:线程: %@", [NSThread currentThread]);
                            NSLog(@"信息:bodyDict: %@", bodyDict);
                            [self saveFeedBackListWithBodyDict:bodyDict chatKey:kSystemChatKey];
                        }
                    }
                }
            });