Function EXE_start

src/jrd/exe.cpp:834–913

void EXE_start(thread_db* tdbb, Request* request, jrd_tra* transaction)
{
/**************************************
 *
 *	E X E _ s t a r t
 *
 **************************************
 *
 * Functional description
 *	Start an execution running.
 *
 **************************************/
	SET_TDBB(tdbb);

	BLKCHK(request, type_req);
	BLKCHK(transaction, type_tra);

	if (request->req_flags & req_active)
		ERR_post(Arg::Gds(isc_req_sync) << Arg::Gds(isc_reqinuse));

	if (transaction->tra_flags & TRA_prepared)
		ERR_post(Arg::Gds(isc_req_no_trans));

	const auto dbb = tdbb->getDatabase();
	const auto statement = request->getStatement();

	// Generate request id.
	request->setRequestId(
		request->isRequestIdUnassigned() && request->isRoot() ?
			statement->getStatementId() :
			dbb->generateStatementId());

	/* Post resources to transaction block.  In particular, the interest locks
	on relations/indices are copied to the transaction, which is very
	important for (short-lived) dynamically compiled requests.  This will
	provide transaction stability by preventing a relation from being
	dropped after it has been referenced from an active transaction. */

	TRA_post_resources(tdbb, transaction, statement->resources);

	TRA_attach_request(transaction, request);
	request->req_flags &= req_in_use | req_restart_ready;
	request->req_flags |= req_active;
	request->req_flags &= ~req_reserved;

	// set up to count records affected by request

	request->req_records_selected = 0;
	request->req_records_updated = 0;
	request->req_records_inserted = 0;
	request->req_records_deleted = 0;

	request->req_records_affected.clear();

	for (auto& rpb : request->req_rpb)
		rpb.rpb_runtime_flags = 0;

	request->req_profiler_ticks = 0;