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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSYSTEMLOCK_H
#define QSYSTEMLOCK_H
#include <QtCore/qstring.h>
QT_BEGIN_HEADER
#ifndef QT_NO_SYSTEMLOCK
QT_FORWARD_DECLARE_CLASS(QSystemLockPrivate)
class QSystemLock
{
public:
enum SystemLockError
{
NoError,
UnknownError
};
QSystemLock(const QString &key);
~QSystemLock();
void setKey(const QString &key);
QString key() const;
enum LockMode
{
ReadOnly,
ReadWrite
};
bool lock(LockMode mode = ReadWrite);
bool unlock();
SystemLockError error() const;
QString errorString() const;
private:
Q_DISABLE_COPY(QSystemLock)
QSystemLockPrivate *d;
};
class QSystemLocker
{
public:
inline QSystemLocker(QSystemLock *systemLock,
QSystemLock::LockMode mode = QSystemLock::ReadWrite) : q_lock(systemLock)
{
autoUnLocked = relock(mode);
}
inline ~QSystemLocker()
{
if (autoUnLocked)
unlock();
}
inline QSystemLock *systemLock() const
{
return q_lock;
}
inline bool relock(QSystemLock::LockMode mode = QSystemLock::ReadWrite)
{
return (q_lock && q_lock->lock(mode));
}
inline bool unlock()
{
if (q_lock && q_lock->unlock()) {
autoUnLocked = false;
return true;
}
return false;
}
private:
Q_DISABLE_COPY(QSystemLocker)
bool autoUnLocked;
QSystemLock *q_lock;
};
#endif // QT_NO_SYSTEMLOCK
QT_END_HEADER
#endif // QSYSTEMLOCK_H
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