Function TRA_cleanup

src/jrd/tra.cpp:293–429

}

bool TRA_cleanup(thread_db* tdbb)
{
/**************************************
 *
 *	T R A _ c l e a n u p
 *
 **************************************
 *
 * Functional description
 *	TRA_cleanup is called at startup while an exclusive lock is
 *	held on the database.  Because we haven't started a transaction,
 *	and we have an exclusive lock on the db, any transactions marked
 *	as active on the transaction inventory pages are indeed dead.
 *	Mark them so.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	CHECK_DBB(dbb);

	// Return without cleaning up the TIP's for a ReadOnly database
	if (dbb->readOnly())
		return false;

	// First, make damn sure there are no outstanding transactions

	for (Jrd::Attachment* attachment = dbb->dbb_attachments; attachment;
		 attachment = attachment->att_next)
	{
		if (attachment->att_transactions)
			return false;
	}

	const ULONG trans_per_tip = dbb->dbb_page_manager.transPerTIP;

	// Read header page and allocate transaction number.  Since
	// the transaction inventory page was initialized to zero, it
	// transaction is automatically marked active.

	WIN window(HEADER_PAGE_NUMBER);
	const header_page* header = (header_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_header);
	const TraNumber ceiling = Ods::getNT(header);
	const TraNumber active = Ods::getOAT(header);
	CCH_RELEASE(tdbb, &window);

	if (ceiling == 0)
		return false;

	// Zip thru transactions from the "oldest active" to the next looking for
	// active transactions.  When one is found, declare it dead.

	const ULONG last = ceiling / trans_per_tip;
	ULONG number = active % trans_per_tip;
	TraNumber limbo = 0;
	bool found = false;

	for (ULONG sequence = active / trans_per_tip; sequence <= last; sequence++, number = 0)
	{