dispatch_semaphore_t sem = dispatch_semaphore_create(1);
dispatch_queue_t queue = dispatch_queue_create("testBlock", NULL);
dispatch_async(queue, ^{
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"1");
dispatch_semaphore_signal(sem);
});
});
dispatch_async(queue, ^{
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
NSLog(@"2");
dispatch_semaphore_signal(sem);
});
dispatch_async(queue, ^{
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"3");
dispatch_semaphore_signal(sem);
});
});
dispatch_async(queue, ^{
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
NSLog(@"4");
dispatch_semaphore_signal(sem);
});
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