Method convert

src/lock/lock.cpp:605–648

bool LockManager::convert(thread_db* tdbb,
						  CheckStatusWrapper* statusVector,
						  SRQ_PTR request_offset,
						  UCHAR type,
						  SSHORT lck_wait,
						  lock_ast_t ast_routine,
						  void* ast_argument)
{
/**************************************
 *
 *	c o n v e r t
 *
 **************************************
 *
 * Functional description
 *	Perform a lock conversion, if possible.
 *
 **************************************/
	LOCK_TRACE(("LM::convert (%d, %d)\n", type, lck_wait));

	LockTableGuard guard(this, FB_FUNCTION, DUMMY_OWNER);

	lrq* const request = get_request(request_offset);
	const SRQ_PTR owner_offset = request->lrq_owner;
	guard.setOwner(owner_offset);

	own* const owner = (own*) SRQ_ABS_PTR(owner_offset);
	if (!owner->own_count)
		return false;

	++(m_sharedMemory->getHeader()->lhb_converts);

	const lbl* lock = (lbl*) SRQ_ABS_PTR(request->lrq_lock);
	if (lock->lbl_series < LCK_MAX_SERIES)
		++(m_sharedMemory->getHeader()->lhb_operations[lock->lbl_series]);
	else
		++(m_sharedMemory->getHeader()->lhb_operations[0]);

	const bool result =
		internal_convert(tdbb, statusVector, request_offset, type, lck_wait,
						 ast_routine, ast_argument);

	return result;
}


UCHAR LockManager::downgrade(thread_db* tdbb,