/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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** This file is part of the QtCore module of the Qt Toolkit.
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** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/
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** review the following information:
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** or contact the sales department at sales@trolltech.com.
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** additional rights. These rights are described in the Trolltech GPL
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** Trolltech ASA (c) 2007
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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****************************************************************************/

#ifndef QSEMAPHORE_H
#define QSEMAPHORE_H

#include <QtCore/qglobal.h>

QT_BEGIN_HEADER

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_HEADER

#endif // QSEMAPHORE_H
