cocoa自动提供的多线程编程技术。

[selfperformSelectorInBackground:@selector(dowork)withObject:nil];[selfperformSelectorOnMainThread:@selector(dowork)withObject:nilwaitUntilDone:nil];

NSTread

GCD

dispatch_queue_tqueue =dispatch_queue_create("my.queue",DISPATCH_QUEUE_CONCURRENT);dispatch_async( queue, ^{

NSLog(@"nidaye");

});

//注意字符串用c语言写的，

dispatch_queue:执行处理的等待队列，FIFO

Seirial Dispatch Queue 等待现在执行写中处理结束；顺序执行。只用一个线程处理一个任务。

dispatch_queue_tserial =dispatch_queue_create("serial",NULL);

Concurrent Dispath Queue 不等待现在执行中处理结束。并行执行，使用多个线程处理多个任务。

dispatch_queue_tcurrent =dispatch_queue_create("current",DISPATCH_QUEUE_CONCURRENT);