Ho to clear a MQ queue :

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LEARN ABOUT OSX

dispatch

dispatch(3)						   BSD Library Functions Manual 					       dispatch(3)

NAME

     dispatch -- the dispatch framework

SYNOPSIS

     #include <dispatch/dispatch.h>

DESCRIPTION

     The dispatch framework allows blocks to be scheduled for asynchronous and concurrent execution via the core functions described in
     dispatch_async(3) and dispatch_apply(3).

     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_create(3) 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_create(3) for more information.

     The dispatch framework also provides functions to monitor underlying system events and automatically submit event handler blocks to dispatch
     queues.

SEE ALSO

     dispatch_after(3), dispatch_api(3), dispatch_apply(3), dispatch_async(3), dispatch_data_create(3), dispatch_group_create(3),
     dispatch_io_create(3), dispatch_io_read(3), dispatch_object(3), dispatch_once(3), dispatch_queue_create(3), dispatch_semaphore_create(3),
     dispatch_source_create(3), dispatch_time(3)

Darwin								    May 1, 2009 							    Darwin

UNIX for Advanced & Expert Users