101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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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 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company 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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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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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// 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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#include "QtCore/qstring.h"
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QT_BEGIN_NAMESPACE
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class QLockData;
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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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enum Type { Read, Write };
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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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private:
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Type type;
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QLockData *data;
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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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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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private:
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QLock *qlock;
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};
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QT_END_NAMESPACE
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#endif // QLOCK_P_H
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