Static method that creates a new IODataQueue instance with the capacity specified in the size parameter.
The size of the data queue memory region.
Returns the newly allocated IODataQueue instance. Zero is returned on failure.
The actual size of the entire data queue memory region (to be shared into a user process) is equal to the capacity plus the IODataQueueMemory overhead. This overhead value can be determined from the DATA_QUEUE_MEMORY_HEADER_SIZE macro in <IOKit/IODataQueueShared.h>. The size of the data queue memory region must include space for the overhead of each IODataQueueEntry. This entry overhead can be determined from the DATA_QUEUE_ENTRY_HEADER_SIZE macro in <IOKit/IODataQueueShared.h>.
This method allocates a new IODataQueue instance and then calls initWithCapacity() with the given size parameter. If the initWithCapacity() fails, the new instance is released and zero is returned.