/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#ifndef QLOCK_P_H+
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#define QLOCK_P_H+
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+
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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 Qt 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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#include "QtCore/qstring.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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class QLockData;+
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+
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class Q_GUI_EXPORT QLock+
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{+
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public:+
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    QLock(const QString &filename, char id, bool create = false);+
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    ~QLock();+
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+
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    enum Type { Read, Write };+
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+
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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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+
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private:+
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    Type type;+
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    QLockData *data;+
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};+
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+
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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 QLockHandle is destructed.+
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class Q_GUI_EXPORT QLockHandle+
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{+
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public:+
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    QLockHandle(QLock *l, QLock::Type type) : qlock(l) { qlock->lock(type); }+
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    ~QLockHandle() { if (locked()) qlock->unlock(); }+
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+
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    void lock(QLock::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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+
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private:+
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    QLock *qlock;+
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};+
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+
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QT_END_NAMESPACE+
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+
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#endif // QLOCK_P_H+
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