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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QWSLOCK_P_H
#define QWSLOCK_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 <qglobal.h>
#ifndef QT_NO_QWS_MULTIPROCESS
#ifdef QT_POSIX_IPC
# include <semaphore.h>
#endif
QT_BEGIN_NAMESPACE
class QWSLock
{
public:
enum LockType { BackingStore, Communication, RegionEvent };
QWSLock(int lockId = -1);
~QWSLock();
bool lock(LockType type, int timeout = -1);
void unlock(LockType type);
bool wait(LockType type, int timeout = -1);
bool hasLock(LockType type);
int id() const { return semId; }
private:
bool up(unsigned short semNum);
bool down(unsigned short semNum, int timeout);
int getValue(unsigned short semNum) const;
int semId;
int lockCount[2];
#ifdef QT_POSIX_IPC
sem_t *sems[3];
bool owned;
#endif
};
QT_END_NAMESPACE
#endif // QT_NO_QWS_MULTIPROCESS
#endif // QWSLOCK_P_H
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