Function internal_dequeue

src/jrd/lck.cpp:1266–1306

static void internal_dequeue(thread_db* tdbb, Lock* lock)
{
/**************************************
 *
 *	i n t e r n a l _ d e q u e u e
 *
 **************************************
 *
 * Functional description
 *	Dequeue a lock.  If there are identical
 *	compatible locks, check to see whether
 *	the lock needs to be downgraded.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* const dbb = tdbb->getDatabase();

	fb_assert(LCK_CHECK_LOCK(lock));
	fb_assert(lock->lck_compatible);

	// if this is the last identical lock in the hash table, release it

	Lock* match;
	if (hash_remove_lock(lock, &match))
	{
		if (!dbb->lockManager()->dequeue(lock->lck_id))
		{
			bug_lck("LOCK_deq() failed in Lock:internal_dequeue");
		}

		lock->lck_id = 0;
		lock->lck_physical = lock->lck_logical = LCK_none;
		return;
	}

	// check for a potential downgrade

	FbLocalStatus statusVector;
	internal_downgrade(tdbb, &statusVector, match);
	fb_assert(statusVector.isEmpty());
}


static USHORT internal_downgrade(thread_db* tdbb, CheckStatusWrapper* statusVector, Lock* first)