.\" Copyright (c) 2008-2009 Apple Inc. All rights reserved. .Dd May 1, 2009 .Dt dispatch 3 .Os Darwin .Sh NAME .Nm dispatch .Nd the dispatch framework .Sh SYNOPSIS .Fd #include <dispatch/dispatch.h> .Sh DESCRIPTION The dispatch framework allows blocks to be scheduled for asynchronous and concurrent execution via the core functions described in .Xr dispatch_async 3 and .Xr dispatch_apply 3 . .Pp Dispatch queues are the basic units of organization of blocks. Several queues are created by default, and applications may create additional queues for their own use. See .Xr dispatch_queue_create 3 for more information. .Pp Dispatch groups allow applications to track the progress of blocks submitted to queues and take action when the blocks complete. See .Xr dispatch_group_create 3 for more information. .Pp The dispatch framework also provides functions to monitor underlying system events and automatically submit event handler blocks to dispatch queues. .Sh SEE ALSO .Xr dispatch_async 3 , .Xr dispatch_object 3 , .Xr dispatch_queue_create 3 , .Xr dispatch_group_create 3 , .Xr dispatch_source_create 3 , .Xr dispatch_benchmark 3 , .Xr dispatch_time 3 , .Xr dispatch_apply 3 , .Xr dispatch_once 3 .