iOS 多线程讲解

//同步操作用途

dispatch_queue_t queue = dispatch_get_global_queue(0, 0);

dispatch_sync(queue, ^{

NSLog(@"登录");

});

dispatch_async(queue, ^{

NSLog(@"下载小说A");

});

dispatch_async(queue, ^{

NSLog(@"下载小说B");

});