Renamed version4 to flaim and version5 to xflaim

git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@7 0109f412-320b-0410-ab79-c3e0c5ffbbe6
2006-01-27 21:06:39 +00:00
parent 4072ed64c8
commit c55dab446f
612 changed files with 0 additions and 0 deletions
--- a/flaim/src/lock.cpp
+++ b/flaim/src/lock.cpp
@@ -0,0 +1,131 @@
+//-------------------------------------------------------------------------
+// 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);
+}