.\" Copyright (c) 2008-2010 Apple Inc. All rights reserved.
.Dd May 1, 2009
.Dt dispatch_after 3
.Os Darwin
.Sh NAME
.Nm dispatch_after
.Nd schedule blocks for deferred execution
.Sh SYNOPSIS
.Fd #include <dispatch/dispatch.h>
.Ft void
.Fo dispatch_after
.Fa "dispatch_time_t when" "dispatch_queue_t queue" "void (^block)(void)"
.Fc
.Ft void
.Fo dispatch_after_f
.Fa "dispatch_time_t when" "dispatch_queue_t queue" "void *context" "void (*function)(void *)"
.Fc
.Sh DESCRIPTION
The
.Fn dispatch_after
function submits the
.Fa block
to the given
.Fa queue
at the time specified by the
.Fa when
parameter.
The
.Fa when
parameter is a value created by
.Fn dispatch_time
or
.Fn dispatch_walltime .
.Pp
For a more detailed description about submitting blocks to queues, see
.Xr dispatch_async 3 .
.Sh CAVEATS
.Fn dispatch_after
retains the passed queue.
.Pp
Specifying
.Vt DISPATCH_TIME_NOW
as the
.Fa when
parameter
is supported, but is not as efficient as calling
.Fn dispatch_async .
.Pp
The result of passing
.Vt DISPATCH_TIME_FOREVER
as the
.Fa when
parameter is undefined.
.Pp
.Sh FUNDAMENTALS
The
.Fn dispatch_after
function is a wrapper around
.Fn dispatch_after_f .
.Sh SEE ALSO
.Xr dispatch 3 ,
.Xr dispatch_async 3 ,
.Xr dispatch_time 3