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

**

** 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

** Alternatively, this file may be used in accordance with the terms and

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

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#ifndef QSHAREDMEMORY_P_H

#define QSHAREDMEMORY_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "qsharedmemory.h"

#ifdef QT_NO_SHAREDMEMORY

# ifndef QT_NO_SYSTEMSEMAPHORE

namespace QSharedMemoryPrivate

{

    int createUnixKeyFile(const QString &fileName);

    QString makePlatformSafeKey(const QString &key,

            const QString &prefix = QLatin1String("qipc_sharedmemory_"));

}

#endif

#else

#include "qsystemsemaphore.h"

#include "private/qobject_p.h"

#ifdef Q_OS_WIN

#  include <qt_windows.h>

#elif defined(Q_OS_SYMBIAN)

#  include <e32std.h>

#  include <sys/types.h>

#else

#  include <sys/types.h>

#endif

QT_BEGIN_NAMESPACE

#ifndef QT_NO_SYSTEMSEMAPHORE

/*!

  Helper class

  */

class QSharedMemoryLocker

{

public:

    inline QSharedMemoryLocker(QSharedMemory *sharedMemory) : q_sm(sharedMemory)

    {

        Q_ASSERT(q_sm);

    }

    inline ~QSharedMemoryLocker()

    {

        if (q_sm)

            q_sm->unlock();

    }

    inline bool lock()

    {

        if (q_sm && q_sm->lock())

            return true;

        q_sm = 0;

        return false;

    }

private:

    QSharedMemory *q_sm;

};

#endif // QT_NO_SYSTEMSEMAPHORE

class Q_AUTOTEST_EXPORT QSharedMemoryPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QSharedMemory)

public:

    QSharedMemoryPrivate();

    void *memory;

    int size;

    QString key;

    QString nativeKey;

    QSharedMemory::SharedMemoryError error;

    QString errorString;

#ifndef QT_NO_SYSTEMSEMAPHORE

    QSystemSemaphore systemSemaphore;

    bool lockedByMe;

#endif

    static int createUnixKeyFile(const QString &fileName);

    static QString makePlatformSafeKey(const QString &key,

            const QString &prefix = QLatin1String("qipc_sharedmemory_"));

#ifdef Q_OS_WIN

    HANDLE handle();

#elif defined(QT_POSIX_IPC)

    int handle();

#else

    key_t handle();

#endif

    bool initKey();

    void cleanHandle();

    bool create(int size);

    bool attach(QSharedMemory::AccessMode mode);

    bool detach();

#ifdef Q_OS_SYMBIAN

    void setErrorString(const QString &function, TInt errorCode);

#else

    void setErrorString(const QString &function);

#endif

#ifndef QT_NO_SYSTEMSEMAPHORE

    inline bool tryLocker(QSharedMemoryLocker *locker, const QString &function) {

        if (!locker->lock()) {

            errorString = QSharedMemory::tr("%1: unable to lock").arg(function);

            error = QSharedMemory::LockError;

            return false;

        }

        return true;

    }

#endif // QT_NO_SYSTEMSEMAPHORE

private:

#ifdef Q_OS_WIN

    HANDLE hand;

#elif defined(Q_OS_SYMBIAN)

    RChunk chunk;

#elif defined(QT_POSIX_IPC)

    int hand;

#else

    key_t unix_key;

#endif

};

QT_END_NAMESPACE

#endif // QT_NO_SHAREDMEMORY

#endif // QSHAREDMEMORY_P_H