man/dispatch_after.3

   1 .\" Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   2 .Dd May 1, 2009
   3 .Dt dispatch_after 3
   4 .Os Darwin
   5 .Sh NAME
   6 .Nm dispatch_after
   7 .Nd schedule blocks for deferred execution
   8 .Sh SYNOPSIS
   9 .Fd #include <dispatch/dispatch.h>
  10 .Ft void
  11 .Fo dispatch_after
  12 .Fa "dispatch_time_t when" "dispatch_queue_t queue" "void (^block)(void)"
  13 .Fc
  14 .Ft void
  15 .Fo dispatch_after_f
  16 .Fa "dispatch_time_t when" "dispatch_queue_t queue" "void *context" "void (^function)(void *)"
  17 .Fc
  18 .Sh DESCRIPTION
  19 The
  20 .Fn dispatch_after
  21 function submits the
  22 .Fa block
  23 to the given
  24 .Fa queue
  25 at the time specified by the
  26 .Fa when
  27 parameter.
  28 The
  29 .Fa when
  30 parameter is a value created by
  31 .Fn dispatch_time
  32 or
  33 .Fn dispatch_walltime .
  34 .Pp
  35 For a more detailed description about submitting blocks to queues, see
  36 .Xr dispatch_async 3 .
  37 .Sh CAVEATS
  38 Specifying
  39 .Vt DISPATCH_TIME_NOW
  40 as the
  41 .Fa when
  42 parameter
  43 is supported, but is not as efficient as calling
  44 .Fn dispatch_async .
  45 The result of passing
  46 .Vt DISPATCH_TIME_FOREVER
  47 as the
  48 .Fa when
  49 parameter is undefined.
  50 .Sh FUNDAMENTALS
  51 The
  52 .Fn dispatch_after
  53 function is a wrapper around
  54 .Fn dispatch_after_f .
  55 .Sh SEE ALSO
  56 .Xr dispatch_async 3 ,
  57 .Xr dispatch_time 3