Function SHMQueueDelete

src/backend/storage/ipc/shmqueue.c:67–81

* SHMQueueDelete -- remove an element from the queue and * close the links */

 *		close the links
 */
void
SHMQueueDelete(SHM_QUEUE *queue)
{
	SHM_QUEUE  *nextElem = queue->next;
	SHM_QUEUE  *prevElem = queue->prev;

	Assert(ShmemAddrIsValid(queue));
	Assert(ShmemAddrIsValid(nextElem));
	Assert(ShmemAddrIsValid(prevElem));

	prevElem->next = queue->next;
	nextElem->prev = queue->prev;

	queue->prev = queue->next = NULL;
}

/*
 * SHMQueueInsertBefore -- put elem in queue before the given queue