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 /*
     SPDX-FileCopyrightText: 2009 Nokia Corporation and /or its subsidiary(-ies).
     Contact: Qt Software Information (qt-info@nokia.com)
 
     This file is part of the QtCore module of the Qt Toolkit.
 
     $QT_BEGIN_LICENSE:LGPL$
     Commercial Usage
     Licensees holding valid Qt Commercial licenses may use this file in
     accordance with the Qt Commercial License Agreement provided with the
     Software or, alternatively, in accordance with the terms contained in
     a written agreement between you and Nokia.
 
     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: https://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: https://www.gnu.org/licenses/gpl-3.0.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 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>
 #include <QThread>
 #include <QMutex>
 #include <QWaitCondition>
 #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();
 
 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