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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

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

#ifndef QSHAREDMEMORY_H

#define QSHAREDMEMORY_H

#include <QtCore/qobject.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_SHAREDMEMORY

class QSharedMemoryPrivate;

class Q_CORE_EXPORT QSharedMemory : public QObject

{

    Q_OBJECT

    Q_DECLARE_PRIVATE(QSharedMemory)

public:

    enum AccessMode

    {

        ReadOnly,

        ReadWrite

    };

    enum SharedMemoryError

    {

        NoError,

        PermissionDenied,

        InvalidSize,

        KeyError,

        AlreadyExists,

        NotFound,

        LockError,

        OutOfResources,

        UnknownError

    };

    QSharedMemory(QObject *parent = 0);

    QSharedMemory(const QString &key, QObject *parent = 0);

    ~QSharedMemory();

    void setKey(const QString &key);

    QString key() const;

    bool create(int size, AccessMode mode = ReadWrite);

    int size() const;

    bool attach(AccessMode mode = ReadWrite);

    bool isAttached() const;

    bool detach();

    void *data();

    const void* constData() const;

    const void *data() const;

#ifndef QT_NO_SYSTEMSEMAPHORE

    bool lock();

    bool unlock();

#endif

    SharedMemoryError error() const;

    QString errorString() const;

private:

    Q_DISABLE_COPY(QSharedMemory)

};

#endif // QT_NO_SHAREDMEMORY

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSHAREDMEMORY_H