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diff --git a/src/corelib/thread/qmutex_p.h b/src/corelib/thread/qmutex_p.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 QMUTEX_P_H
+#define QMUTEX_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qmutex.cpp, qmutex_unix.cpp, and qmutex_win.cpp.  This header
+// file may change from version to version without notice, or even be
+// removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qnamespace.h>
+#include <QtCore/qmutex.h>
+
+#if defined(Q_OS_MAC)
+# include <mach/semaphore.h>
+#endif
+
+#if defined(Q_OS_SYMBIAN)
+# include <e32std.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QMutexPrivate : public QMutexData {
+public:
+    QMutexPrivate(QMutex::RecursionMode mode);
+    ~QMutexPrivate();
+
+    bool wait(int timeout = -1);
+    void wakeUp();
+
+    // 1ms = 1000000ns
+    enum { MaximumSpinTimeThreshold = 1000000 };
+    volatile qint64 maximumSpinTime;
+    volatile qint64 averageWaitTime;
+    Qt::HANDLE owner;
+    uint count;
+
+#if defined(Q_OS_MAC)
+    semaphore_t mach_semaphore;
+#elif defined(Q_OS_UNIX) && !defined(Q_OS_LINUX) && !defined(Q_OS_SYMBIAN)
+    volatile bool wakeup;
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+#elif defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
+    HANDLE event;
+#elif defined(Q_OS_SYMBIAN)
+    RSemaphore lock;
+#endif
+};
+
+inline QMutexData::QMutexData(QMutex::RecursionMode mode)
+    : recursive(mode == QMutex::Recursive)
+{}
+
+inline QMutexData::~QMutexData() {}
+
+QT_END_NAMESPACE
+
+#endif // QMUTEX_P_H