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- (void)test
{
    dispatch_group_t group = dispatch_group_create();
    
    dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
        // block1
        NSLog(@"Block1");
        [NSThread sleepForTimeInterval:5.0];
        NSLog(@"Block1 End");
    });
    
    
    dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
        // block2
        NSLog(@"Block2");
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            NSLog(@"123");
        });
        [NSThread sleepForTimeInterval:8.0];
        NSLog(@"Block2 End");
    });
    
    dispatch_group_notify(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
        // block3
        NSLog(@"Block3");
    });
    
    dispatch_release(group);
}