Function execute_looper

src/jrd/exe.cpp:1004–1098

static void execute_looper(thread_db* tdbb,
						   Request* request,
						   jrd_tra* transaction,
						   const StmtNode* node,
						   Request::req_s next_state)
{
/**************************************
 *
 *	e x e c u t e _ l o o p e r
 *
 **************************************
 *
 * Functional description
 *	Wrapper around looper. This will execute
 *	looper with the save point mechanism.
 *
 **************************************/
	DEV_BLKCHK(request, type_req);

	SET_TDBB(tdbb);
	Jrd::Attachment* const attachment = tdbb->getAttachment();

	// Ensure the cancellation lock can be triggered

	Lock* const lock = attachment->att_cancel_lock;
	if (lock && lock->lck_logical == LCK_none)
		LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT);

	// Start a save point

	SavNumber savNumber = 0;

	if (!(request->req_flags & req_proc_fetch) && request->req_transaction)
	{
		if (transaction && !(transaction->tra_flags & TRA_system))
		{
			if (request->req_savepoints)
			{
				request->req_savepoints =
					request->req_savepoints->moveToStack(transaction->tra_save_point);
			}
			else
				transaction->startSavepoint();

			savNumber = transaction->tra_save_point->getNumber();
		}
	}

	request->req_flags &= ~req_stall;
	request->req_operation = next_state;

	try
	{
		looper_seh(tdbb, request, node);
	}
	catch (const Exception&)
	{
		// In the case of error, undo changes performed under our savepoint