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diff --git a/src/corelib/tools/qtimestamp.h b/src/corelib/tools/qtimestamp.h
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+/****************************************************************************
+**
+** Copyright (C) 2010 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 QTIMESTAMP_H
+#define QTIMESTAMP_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+class Q_CORE_EXPORT QTimestamp
+{
+public:
+    static bool isMonotonic();
+
+    void start();
+    qint64 restart()
+    {
+        qint64 r = elapsed();
+        start();
+        return r;
+    }
+
+    qint64 elapsed() const;
+    bool hasExpired(qint64 timeout) const
+    {
+        // if timeout is -1, quint64(timeout) is LLINT_MAX, so this will be
+        // considered as never expired
+        return quint64(elapsed()) > quint64(timeout);
+    }
+
+    qint64 msecsTo(const QTimestamp &other) const;
+    void addMSecs(int ms);
+    qint64 secsTo(const QTimestamp &other) const;
+    void addSecs(int secs);
+
+    bool operator==(const QTimestamp &other) const
+    { return t1 == other.t1 && t2 == other.t2; }
+    bool operator!=(const QTimestamp &other) const
+    { return !(*this == other); }
+
+    friend bool Q_CORE_EXPORT operator<(const QTimestamp &v1, const QTimestamp &v2);
+    friend qint64 operator-(const QTimestamp &v1, const QTimestamp &v2)
+    { return v2.msecsTo(v1); }
+
+    friend QTimestamp &operator+=(QTimestamp &ts, qint64 ms)
+    { ts.addMSecs(ms); return ts; }
+    friend QTimestamp operator+(const QTimestamp &ts, qint64 ms)
+    { QTimestamp copy(ts); return copy += ms; }
+    friend QTimestamp &operator-=(QTimestamp &ts, qint64 ms)
+    { ts.addMSecs(-ms); return ts; }
+    friend QTimestamp operator-(const QTimestamp &ts, qint64 ms)
+    { QTimestamp copy(ts); return copy -= ms; }
+
+private:
+    qint64 t1;
+    qint64 t2;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QTIMESTAMP_H