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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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