Function VIO_init

src/jrd/vio.cpp:3219–3274

void VIO_init(thread_db* tdbb)
{
/**************************************
 *
 *	V I O _ i n i t
 *
 **************************************
 *
 * Functional description
 *	Activate the garbage collector thread.
 *
 **************************************/
	Database* dbb = tdbb->getDatabase();
	Jrd::Attachment* attachment = tdbb->getAttachment();

	if (dbb->readOnly() || !(dbb->dbb_flags & DBB_gc_background))
		return;

	// If there's no presence of a garbage collector running then start one up.

	if (!(dbb->dbb_flags & DBB_garbage_collector))
	{
		const ULONG old = dbb->dbb_flags.exchangeBitOr(DBB_gc_starting);
		if (!(old & DBB_gc_starting))
		{
			if (old & DBB_garbage_collector)
				dbb->dbb_flags &= ~DBB_gc_starting;
			else
			{
				try
				{
					dbb->dbb_gc_fini.run(dbb);
				}
				catch (const Exception&)
				{
					dbb->dbb_flags &= ~DBB_gc_starting;
					ERR_bugcheck_msg("cannot start garbage collector thread");
				}

				dbb->dbb_gc_init.enter();
			}
		}
	}

	// Database backups and sweeps perform their own garbage collection
	// unless passing a no garbage collect switch which means don't
	// notify the garbage collector to garbage collect. Every other
	// attachment notifies the garbage collector to do their dirty work.

	if ((dbb->dbb_flags & DBB_garbage_collector) &&
		!(attachment->att_flags & ATT_no_cleanup) &&
		!attachment->isGbak())
	{
		attachment->att_flags |= ATT_notify_gc;
	}
}

bool VIO_modify(thread_db* tdbb, record_param* org_rpb, record_param* new_rpb, jrd_tra* transaction)