/****************************************************************************

**

** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** GNU Lesser General Public License Usage

** 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, Nokia gives you certain additional

** rights. These rights are described in the Nokia 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.

**

** Other Usage

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** conditions contained in a signed written agreement between you and Nokia.

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**

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**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QSYSTEMSEMAPHORE_H

#define QSYSTEMSEMAPHORE_H

#include <QtCore/qstring.h>

#include <QtCore/qscopedpointer.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_SYSTEMSEMAPHORE

class QSystemSemaphorePrivate;

class Q_CORE_EXPORT QSystemSemaphore

{

public:

    enum AccessMode

    {

        Open,

        Create

    };

    enum SystemSemaphoreError

    {

        NoError,

        PermissionDenied,

        KeyError,

        AlreadyExists,

        NotFound,

        OutOfResources,

        UnknownError

    };

    QSystemSemaphore(const QString &key, int initialValue = 0, AccessMode mode = Open);

    ~QSystemSemaphore();

    void setKey(const QString &key, int initialValue = 0, AccessMode mode = Open);

    QString key() const;

    bool acquire();

    bool release(int n = 1);

    SystemSemaphoreError error() const;

    QString errorString() const;

private:

    Q_DISABLE_COPY(QSystemSemaphore)

    QScopedPointer<QSystemSemaphorePrivate> d;

};

#endif // QT_NO_SYSTEMSEMAPHORE

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSYSTEMSEMAPHORE_H