SYNOPSISFd #include <dispatch/dispatch.h>
DESCRIPTIONThe dispatch framework allows blocks to be scheduled for asynchronous and concurrent execution via the core functions described in dispatch_async3and dispatch_apply3.
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 dispatch_queue_create3 for more information.
Dispatch groups allow applications to track the progress of blocks submitted to queues and take action when the blocks complete. See dispatch_group_create3 for more information.
The dispatch framework also provides functions to monitor underlying system events and automatically submit event handler blocks to dispatch queues.