Dispatch methods provided by the gcd-system

The dispatch methods provided by the system are as follows:

  //dispatch methods provided by the system//Background execution:Dispatch_async (Dispatch_get_global_queue (0,0), ^{        //something    }); //main thread Execution:Dispatch_async (Dispatch_get_main_queue (), ^{        //something    }); //Disposable Execution:    Staticdispatch_once_t Oncetoken; Dispatch_once (&oncetoken, ^{        //something    }); //delay of 2 seconds execution:    DoubleDelayinseconds =2.0; dispatch_time_t Poptime= Dispatch_time (Dispatch_time_now, Delayinseconds *nsec_per_sec); Dispatch_after (Poptime, Dispatch_get_main_queue (),^(void){        //delay 2s execution in the main thread    }); //Custom Queuedispatch_queue_t Urls_queue = Dispatch_queue_create ("blog.devtang.com", NULL); Dispatch_async (Urls_queue,^{        //something    }); //let the background 2 threads execute in parallel, and wait until 2 threads are finished, then summarize the execution resultsdispatch_group_t Group =dispatch_group_create (); Dispatch_group_async (Group, Dispatch_get_global_queue (0,0), ^{        //thread one in parallel execution    }); Dispatch_group_async (Group, Dispatch_get_global_queue (0,0), ^{        //threads executed in parallel two    }); Dispatch_group_notify (Group, Dispatch_get_global_queue (0,0), ^{        //Summary Results});

Resources:

http://www.devtang.com/blog/2012/02/22/use-gcd/

Http://www.cnblogs.com/pure/archive/2013/03/31/2977420.html

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Dispatch methods provided by the gcd-system