c55dab446f
git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@7 0109f412-320b-0410-ab79-c3e0c5ffbbe6
132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
//-------------------------------------------------------------------------
|
|
// Desc: Database locking and unlocking.
|
|
// Tabs: 3
|
|
//
|
|
// Copyright (c) 1991,1994-2006 Novell, Inc. All Rights Reserved.
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of version 2 of the GNU General Public
|
|
// License as published by the Free Software Foundation.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, contact Novell, Inc.
|
|
//
|
|
// To contact Novell about this file by physical or electronic mail,
|
|
// you may find current contact information at www.novell.com
|
|
//
|
|
// $Id: lock.cpp 12315 2006-01-19 15:16:37 -0700 (Thu, 19 Jan 2006) dsanders $
|
|
//-------------------------------------------------------------------------
|
|
|
|
#include "flaimsys.h"
|
|
|
|
/****************************************************************************
|
|
Desc: This routine locks a database for exclusive access.
|
|
Ret: FERR_OK - Indicates that the database was successfully locked.
|
|
FCERR_LOCK - Error locking database file.
|
|
****************************************************************************/
|
|
RCODE dbLock(
|
|
FDB * pDb,
|
|
FLMUINT uiMaxLockWait)
|
|
{
|
|
RCODE rc = FERR_OK;
|
|
FLMBOOL bGotFileLock = FALSE;
|
|
FFILE * pFile = pDb->pFile;
|
|
|
|
// There must NOT be a shared lock on the file.
|
|
|
|
if (pDb->uiFlags & FDB_FILE_LOCK_SHARED)
|
|
{
|
|
rc = RC_SET( FERR_PERMISSION);
|
|
goto Exit;
|
|
}
|
|
|
|
// Must acquire an exclusive file lock first, if it hasn't been
|
|
// acquired.
|
|
|
|
if (!(pDb->uiFlags & FDB_HAS_FILE_LOCK))
|
|
{
|
|
if (RC_BAD( rc = pFile->pFileLockObj->Lock( TRUE, pDb, FALSE, TRUE,
|
|
uiMaxLockWait, 0, pDb->pDbStats)))
|
|
{
|
|
goto Exit;
|
|
}
|
|
bGotFileLock = TRUE;
|
|
pDb->uiFlags |= (FDB_HAS_FILE_LOCK | FDB_FILE_LOCK_IMPLICIT);
|
|
}
|
|
|
|
if( RC_OK( rc = dbWriteLock( pFile, pDb->pDbStats)))
|
|
{
|
|
pDb->uiFlags |= FDB_HAS_WRITE_LOCK;
|
|
}
|
|
|
|
Exit:
|
|
|
|
if (rc == FERR_IO_FILE_LOCK_ERR)
|
|
{
|
|
if (bGotFileLock)
|
|
{
|
|
(void)pFile->pFileLockObj->Unlock( TRUE, pDb);
|
|
pDb->uiFlags &= (~(FDB_HAS_FILE_LOCK |
|
|
FDB_FILE_LOCK_IMPLICIT | FDB_HAS_WRITE_LOCK));
|
|
}
|
|
|
|
if (pDb->uiTransType != FLM_NO_TRANS)
|
|
{
|
|
|
|
// Unlink the DB from the transaction.
|
|
|
|
(void)flmUnlinkDbFromTrans( pDb, FALSE);
|
|
}
|
|
}
|
|
else if (RC_BAD( rc))
|
|
{
|
|
if (bGotFileLock)
|
|
{
|
|
(void)pFile->pFileLockObj->Unlock( TRUE, pDb);
|
|
pDb->uiFlags &= (~(FDB_HAS_FILE_LOCK |
|
|
FDB_FILE_LOCK_IMPLICIT | FDB_HAS_WRITE_LOCK));
|
|
}
|
|
}
|
|
|
|
return( rc);
|
|
}
|
|
|
|
/****************************************************************************
|
|
Desc: This routine unlocks a database that was previously locked
|
|
using the dbLock routine.
|
|
Ret: FERR_OK - Indicates that the database was
|
|
successfully unlocked.
|
|
FERR_UNLOCK - Error unlocking file.
|
|
****************************************************************************/
|
|
RCODE dbUnlock(
|
|
FDB * pDb)
|
|
{
|
|
RCODE rc = FERR_OK;
|
|
|
|
// If we have the write lock, unlock it first.
|
|
|
|
flmAssert( pDb->uiFlags & FDB_HAS_WRITE_LOCK);
|
|
|
|
dbWriteUnlock( pDb->pFile, pDb->pDbStats);
|
|
pDb->uiFlags &= ~FDB_HAS_WRITE_LOCK;
|
|
|
|
// Give up the file lock, if it was acquired implicitly.
|
|
|
|
if (pDb->uiFlags & FDB_FILE_LOCK_IMPLICIT)
|
|
{
|
|
if (RC_OK( rc = pDb->pFile->pFileLockObj->Unlock( TRUE, pDb)))
|
|
{
|
|
pDb->uiFlags &=
|
|
(~(FDB_HAS_FILE_LOCK | FDB_FILE_LOCK_IMPLICIT));
|
|
}
|
|
}
|
|
|
|
// Exit:
|
|
return( rc);
|
|
}
|