Lines Matching defs:head
86 dataQueue->head = 0;
110 const UInt32 head = dataQueue->head; // volatile
115 if ( tail >= head )
131 else if ( head > entrySize ) // Is there enough room at the beginning?
134 // up to the head.
157 // Do not allow the tail to catch up to the head when the queue is full.
160 if ( (head - tail) > entrySize )
176 if ( ( head == tail ) /* queue was empty prior to enqueue() */
177 || ( dataQueue->head == tail ) ) /* queue was emptied during enqueue() */