Long live Qt 4.5!

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diff --git a/src/gui/embedded/qlock_p.h b/src/gui/embedded/qlock_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QLOCK_P_H
+#define QLOCK_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  This header file may
+// change from version to version without notice, or even be
+// removed.
+//
+// We mean it.
+//
+
+#include "QtCore/qstring.h"
+
+QT_BEGIN_NAMESPACE
+
+class QLockData;
+
+class Q_GUI_EXPORT QLock
+{
+public:
+    QLock(const QString &filename, char id, bool create = false);
+    ~QLock();
+
+    enum Type { Read, Write };
+
+    bool isValid() const;
+    void lock(Type type);
+    void unlock();
+    bool locked() const;
+
+private:
+    Type type;
+    QLockData *data;
+};
+
+
+// Nice class for ensuring the lock is released.
+// Just create one on the stack and the lock is automatically released
+// when QLockHandle is destructed.
+class Q_GUI_EXPORT QLockHandle
+{
+public:
+    QLockHandle(QLock *l, QLock::Type type) : qlock(l) { qlock->lock(type); }
+    ~QLockHandle() { if (locked()) qlock->unlock(); }
+
+    void lock(QLock::Type type) { qlock->lock(type); }
+    void unlock() { qlock->unlock(); }
+    bool locked() const { return qlock->locked(); }
+
+private:
+    QLock *qlock;
+};
+
+QT_END_NAMESPACE
+
+#endif // QLOCK_P_H