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100 lines
2.7 KiB
100 lines
2.7 KiB
/****************************************************************************
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**
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** Definition of TQLock class. This manages interprocess locking
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**
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** Created : 20000406
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**
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** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the TQt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free TQt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** Licensees holding valid TQt Commercial licenses may use this file in
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** accordance with the TQt Commercial License Agreement provided with
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** the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#ifndef TQLOCK_P_H
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#define TQLOCK_P_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the TQt API. This header file may
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// change from version to version without notice, or even be
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// removed.
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//
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// We mean it.
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//
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//
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#ifndef QT_H
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#include "ntqstring.h"
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#endif // QT_H
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class TQLockData;
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class TQLock
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{
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public:
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TQLock( const TQString &filename, char id, bool create = FALSE );
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~TQLock();
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enum Type { Read, Write };
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bool isValid() const;
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void lock( Type type );
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void unlock();
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bool locked() const;
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private:
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Type type;
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TQLockData *data;
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};
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// Nice class for ensuring the lock is released.
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// Just create one on the stack and the lock is automatically released
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// when TQLockHolder is destructed.
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class TQLockHolder
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{
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public:
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TQLockHolder( TQLock *l, TQLock::Type type ) : qlock(l) {
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qlock->lock( type );
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}
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~TQLockHolder() { if ( locked() ) qlock->unlock(); }
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void lock( TQLock::Type type ) { qlock->lock( type ); }
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void unlock() { qlock->unlock(); }
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bool locked() const { return qlock->locked(); }
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private:
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TQLock *qlock;
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};
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#endif
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