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/****************************************************************************
**
** Copyright (C) 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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: http://www.gnu.org/copyleft/gpl.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.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();
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
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