/****************************************************************************
**
** Copyright (C) 2011 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the 
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
** 
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
****************************************************************************/

#ifndef QSEMAPHORE_H
#define QSEMAPHORE_H

#include <QtCore/qglobal.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_THREAD

class QSemaphorePrivate;

class Q_CORE_EXPORT QSemaphore
{
public:
    explicit QSemaphore(int n = 0);
    ~QSemaphore();

    void acquire(int n = 1);
    bool tryAcquire(int n = 1);
    bool tryAcquire(int n, int timeout);

    void release(int n = 1);

    int available() const;

private:
    Q_DISABLE_COPY(QSemaphore)

    QSemaphorePrivate *d;
};

#endif // QT_NO_THREAD

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSEMAPHORE_H
