IODataQueueMemory
A struct mapping to the header region of a data queue.
Declaration
typealias IODataQueueMemory = _IODataQueueMemoryDiscussion
This struct is variable sized. The struct represents the data queue header information plus a pointer to the actual data queue itself. The size of the struct is the combined size of the header fields (3 * sizeof(UInt32)) plus the actual size of the queue region. This size is stored in the queueSize field.