osx man page for dispatch_after

dispatch_after(3)					   BSD 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 created by dispatch_time() or dispatch_walltime().

     For a more detailed description about submitting blocks to queues, see dispatch_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 undefined.

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 							    Darwin