调度组
常规用法
- (void)group1 {
dispatch_group_t group = dispatch_group_create();
dispatch_queue_t q = dispatch_get_global_queue(0, 0);
dispatch_group_async(group, q, ^{
[NSThread sleepForTimeInterval:1.0];
NSLog(@"任务 1 %@", [NSThread currentThread]);
});
dispatch_group_async(group, q, ^{
NSLog(@"任务 2 %@", [NSThread currentThread]);
});
dispatch_group_async(group, q, ^{
NSLog(@"任务 3 %@", [NSThread currentThread]);
});
dispatch_group_notify(group, q, ^{
NSLog(@"OVER %@", [NSThread currentThread]);
});
NSLog(@"come here");
}
enter & leavel
- (void)group2 {
dispatch_group_t group = dispatch_group_create();
dispatch_queue_t q = dispatch_get_global_queue(0, 0);
dispatch_group_enter(group);
dispatch_group_async(group, q, ^{
NSLog(@"任务 1 %@", [NSThread currentThread]);
dispatch_group_leave(group);
});
dispatch_group_enter(group);
dispatch_group_async(group, q, ^{
NSLog(@"任务 2 %@", [NSThread currentThread]);
dispatch_group_leave(group);
});
dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
NSLog(@"OVER %@", [NSThread currentThread]);
}
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