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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QLOCK_P_H
#define QLOCK_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. This header file may
// change from version to version without notice, or even be
// removed.
//
// We mean it.
//
#include "QtCore/qstring.h"
QT_BEGIN_NAMESPACE
class QLockData;
class Q_GUI_EXPORT QLock
{
public:
QLock(const QString &filename, char id, bool create = false);
~QLock();
enum Type { Read, Write };
bool isValid() const;
void lock(Type type);
void unlock();
bool locked() const;
private:
Type type;
QLockData *data;
};
// Nice class for ensuring the lock is released.
// Just create one on the stack and the lock is automatically released
// when QLockHandle is destructed.
class Q_GUI_EXPORT QLockHandle
{
public:
QLockHandle(QLock *l, QLock::Type type) : qlock(l) { qlock->lock(type); }
~QLockHandle() { if (locked()) qlock->unlock(); }
void lock(QLock::Type type) { qlock->lock(type); }
void unlock() { qlock->unlock(); }
bool locked() const { return qlock->locked(); }
private:
QLock *qlock;
};
QT_END_NAMESPACE
#endif // QLOCK_P_H
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