Function umtxq_count

freebsd/kern/kern_umtx.c:666–676

* Check if there are multiple waiters */

 * Check if there are multiple waiters
 */
static int
umtxq_count(struct umtx_key *key)
{
	struct umtxq_queue *uh;

	UMTXQ_LOCKED_ASSERT(umtxq_getchain(key));
	uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE);
	if (uh != NULL)
		return (uh->length);
	return (0);
}

/*
 * Check if there are multiple PI waiters and returns first