/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the test suite of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** 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

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**

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****************************************************************************/

#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