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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 <qelapsedtimer.h>
#include <qthread.h>
#include <qmutex.h>
#include <qwaitcondition.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
#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(int(totalTimeOut - timer.elapsed()), 0);
}
bool hasTimedOut() const
{
if (totalTimeOut == -1)
return false;
return timer.elapsed() >= totalTimeOut;
}
void resetIncrements()
{
nextSleep = qMin(SLEEPMIN, timeLeft());
}
private:
QElapsedTimer timer;
int totalTimeOut;
int nextSleep;
};
class Q_CORE_EXPORT QWindowsPipeWriter : public QThread
{
Q_OBJECT
Q_SIGNALS:
void canWrite();
void bytesWritten(qint64 bytes);
public:
explicit 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
#endif // QT_NO_PROCESS
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