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diff --git a/src/corelib/io/qwindowspipewriter_p.h b/src/corelib/io/qwindowspipewriter_p.h
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+++ b/src/corelib/io/qwindowspipewriter_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 QWINDOWSPIPEWRITER_P_H
+#define QWINDOWSPIPEWRITER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qdatetime.h>
+#include <qthread.h>
+#include <qmutex.h>
+#include <qwaitcondition.h>
+#include <qt_windows.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+#ifndef QT_NO_THREAD
+
+#define SLEEPMIN 10
+#define SLEEPMAX 500
+
+class QIncrementalSleepTimer
+{
+
+public:
+    QIncrementalSleepTimer(int msecs)
+        : totalTimeOut(msecs)
+        , nextSleep(qMin(SLEEPMIN, totalTimeOut))
+    {
+        if (totalTimeOut == -1)
+            nextSleep = SLEEPMIN;
+        timer.start();
+    }
+
+    int nextSleepTime()
+    {
+        int tmp = nextSleep;
+        nextSleep = qMin(nextSleep * 2, qMin(SLEEPMAX, timeLeft()));
+        return tmp;
+    }
+
+    int timeLeft() const
+    {
+        if (totalTimeOut == -1)
+            return SLEEPMAX;
+        return qMax(totalTimeOut - timer.elapsed(), 0);
+    }
+
+    bool hasTimedOut() const
+    {
+        if (totalTimeOut == -1)
+            return false;
+        return timer.elapsed() >= totalTimeOut;
+    }
+
+    void resetIncrements()
+    {
+        nextSleep = qMin(SLEEPMIN, timeLeft());
+    }
+
+private:
+    QTime timer;
+    int totalTimeOut;
+    int nextSleep;
+};
+
+class Q_CORE_EXPORT QWindowsPipeWriter : public QThread
+{
+    Q_OBJECT
+
+Q_SIGNALS:
+    void canWrite();
+    void bytesWritten(qint64 bytes);
+
+public:
+    QWindowsPipeWriter(HANDLE writePipe, QObject * parent = 0);
+    ~QWindowsPipeWriter();
+
+    bool waitForWrite(int msecs);
+    qint64 write(const char *data, qint64 maxlen);
+
+    qint64 bytesToWrite() const
+    {
+        QMutexLocker locker(&lock);
+        return data.size();
+    }
+
+    bool hadWritten() const
+    {
+        return hasWritten;
+    }
+
+protected:
+   void run();
+
+private:
+    QByteArray data;
+    QWaitCondition waitCondition;
+    mutable QMutex lock;
+    HANDLE writePipe;
+    volatile bool quitNow;
+    bool hasWritten;
+};
+
+#endif //QT_NO_THREAD
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QT_NO_PROCESS