group函数操作
- (void)groupSync
{
dispatch_queue_t disqueue = dispatch_queue_create("com.shidaiyinuo.NetWorkStudy", DISPATCH_QUEUE_CONCURRENT);
dispatch_group_t disgroup = dispatch_group_create();
dispatch_group_async(disgroup, disqueue, ^{
NSLog(@"任务一完成");
});
dispatch_group_async(disgroup, disqueue, ^{
sleep(8);
NSLog(@"任务二完成");
});
dispatch_group_notify(disgroup, disqueue, ^{
NSLog(@"dispatch_group_notify 执行");
});
dispatch_async(dispatch_get_global_queue(0, 0), ^{
dispatch_group_wait(disgroup, dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_SEC));
NSLog(@"dispatch_group_wait 结束");
});
}
