iphone - suspending dispatch timers from main_queue when it was created on another one -

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can suspend gcd timer queue besides 1 it's schedule run on?

i have timer, created on global_queue low priority , when fires, manipulate ui work via main_queue. states in ui, have suspend timer. have switch main_queue low priority queue perform suspend?

dispatch_queue_t lowpriq = dispatch_get_global_queue(dispatch_queue_priority_low, 0);    mytimer = dispatch_source_create(dispatch_source_type_timer, 0, 0, lowpriq);          dispatch_source_set_timer(mytimer,                            starttime, //                           interval, // 15 seconds                           2000ull);   // configure event handler dispatch_source_set_event_handler(mytimer, ^{                nslog(@"timer fired");      // ui work     dispatch_async(dispatch_get_main_queue(), ^ {             [self dosomebuttonenabledisable]     });                         });  dispatch_resume(mytimer); // start timer  - (void)dosomebuttonenabledisable {     if (someparticularstate) {         // turn off timer           // should suspend timer on low priority global queue         // or valid suspend on main queue?          dispatch_queue_t lowpriq = dispatch_get_global_queue(dispatch_queue_priority_low, 0);             dispatch_async(lowpriq(), ^ {              dispatch_suspend(mytimer);         });                                 } }

yes, it's valid suspend dispatch object queue. if block running when dispatch_suspend() called, block complete execution , subsequent scheduled blocks prevented executing.


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