Function CCH_unwind

src/jrd/cch.cpp:2293–2398

}

void CCH_unwind(thread_db* tdbb, const bool punt)
{
/**************************************
 *
 *	C C H _ u n w i n d
 *
 **************************************
 *
 * Functional description
 *	Synchronously unwind cache after I/O or lock error.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();

	// CCH_unwind is called when any of the following occurs:
	// - IO error
	// - journaling error => obsolete
	// - bad page checksum => obsolete
	// - wrong page type
	// - page locking (not latching) deadlock

	BufferControl* bcb = dbb->dbb_bcb;
	if (!bcb || (tdbb->tdbb_flags & TDBB_no_cache_unwind))
	{
		if (punt)
			ERR_punt();

		return;
	}

	// A cache error has occurred. Scan the cache for buffers
	// which may be in use and release them.

	for (FB_SIZE_T n = 0; n < tdbb->tdbb_bdbs.getCount(); ++n)
	{
		BufferDesc *bdb = tdbb->tdbb_bdbs[n];
		if (bdb)
		{
			if (bdb->bdb_flags & BDB_marked)
				BUGCHECK(268);	// msg 268 buffer marked during cache unwind

			if (bdb->ourIOLock())
			{
				bdb->unLockIO(tdbb);
			}
			else
			{
				if (bdb->ourExclusiveLock())
					bdb->bdb_flags &= ~(BDB_writer | BDB_faked | BDB_must_write);

				bdb->release(tdbb, true);
			}
		}
	}

	/***
	bcb_repeat* tail = bcb->bcb_rpt;