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dispatch_after(3) Library Functions Manual dispatch_after(3) NAME dispatch_after -- schedule blocks for deferred execution SYNOPSIS #include <dispatch/dispatch.h> void dispatch_after(dispatch_time_t when, dispatch_queue_t queue, void (^block)(void)); void dispatch_after_f(dispatch_time_t when, dispatch_queue_t queue, void *context, void (*function)(void *)); DESCRIPTION The dispatch_after() function submits the block to the given queue at the time specified by the when parameter. The when parameter is a value cre- ated by dispatch_time() or dispatch_walltime(). Submission of the block may be delayed by the system in order to improve power consumption and sys- tem performance. The system applies a leeway (see dis- patch_source_set_timer(3)) that is equal to one tenth of the interval be- tween when and the time at which the function is called, with the leeway capped to at least one millisecond and at most one minute. For a more detailed description about submitting blocks to queues, see dis- patch_async(3). CAVEATS dispatch_after() retains the passed queue. Specifying DISPATCH_TIME_NOW as the when parameter is supported, but is not as efficient as calling dispatch_async(). The result of passing DISPATCH_TIME_FOREVER as the when parameter is unde- fined. FUNDAMENTALS The dispatch_after() function is a wrapper around dispatch_after_f(). SEE ALSO dispatch(3), dispatch_async(3), dispatch_time(3) Darwin May 1, 2009 dispatch_after(3)
NAME | SYNOPSIS | DESCRIPTION | CAVEATS | FUNDAMENTALS | SEE ALSO
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