異步隊(duì)列同步的幾種方式
#pragma mark ---- dispatch_barrier_async
dispatch_queue_t queue = dispatch_queue_create("yohans.queue", DISPATCH_QUEUE_CONCURRENT);
dispatch_async(queue, ^{
sleep(1);
NSLog(@"get City");
});
dispatch_async(queue, ^{
sleep(2);
NSLog(@"get Category");
});
dispatch_barrier_async(queue, ^{
NSLog(@"get Goods by City and Category");
});
#pragma mark ---- dispatch_group_notify
dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(1);
NSLog(@"get City");
});
dispatch_group_async(group,dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(2);
NSLog(@"get Category");
});
dispatch_group_notify(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSLog(@"get Goods by City and Category");
});
#pragma mark ---- dispatch_group_notify 手工管理
dispatch_group_t group = dispatch_group_create();
dispatch_group_enter(group);
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(1);
NSLog(@"get City");
dispatch_group_leave(group);
});
dispatch_group_enter(group);
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(2);
NSLog(@"get Category");
dispatch_group_leave(group);
});
dispatch_group_notify(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSLog(@"get Goods by City and Category");
});