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CXXL, task_package, Global Declarations, Queue Mode Values
 *Conan The Librarian 

  The following values are used by the qhead and qtail classes for
  managing queues:

 EMODE		Generates a run-time error if full on enqueue or empty
 		on dequeue

 WMODE		Suspends task execution if full on enqueue or empty on
 		dequeue

  ZMODE		Returns NULL if full on enqueue or empty on dequeue
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