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****************************************************************************/

#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