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

#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