* @discussion The IOMemoryDescriptor instance returned by this method is intended to be mapped into a user process. This is the memory region that the IODataQueueClient code operates on.
* @result Returns a newly allocated IOMemoryDescriptor for the IODataQueueMemory region. Returns zero on failure.
*/
* @discussion The IOMemoryDescriptor instance returned by this method is intended to be mapped into a user process. This is the memory region that the IODataQueueClient code operates on.
* @result Returns a newly allocated IOMemoryDescriptor for the IODataQueueMemory region. Returns zero on failure.
*/