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diff --git a/src/corelib/kernel/qsystemsemaphore.h b/src/corelib/kernel/qsystemsemaphore.h
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+++ b/src/corelib/kernel/qsystemsemaphore.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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
+