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BOOL ifYouBack = false; - (void)waitForYou{ dispatch_queue_t ourLifeQueue = dispatch_get_main_queue(); // dispatch_queue_t waitForYouQueue = dispatch_queue_create("I.AM.ALWAYS.HERE", DISPATCH_QUEUE_CONCURRENT); dispatch_queue_t waitForYouQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0); dispatch_async(waitForYouQueue, ^{ while (![self ifYouback]) { dispatch_sync(ourLifeQueue, ^{ NSLog(@"let's begin a happy life, 115-110-111-119"); }); } }); while (![self ifYouback]) { sleep(1); dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ while (![self ifYouback]) { NSLog(@"do some thing for life"); } }); } } - (BOOL)ifYouback{ return ifYouBack; }

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