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Diffstat (limited to 'src/corelib/io/qwindowspipewriter_p.h')
-rw-r--r-- | src/corelib/io/qwindowspipewriter_p.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/corelib/io/qwindowspipewriter_p.h b/src/corelib/io/qwindowspipewriter_p.h new file mode 100644 index 0000000000..ce0c7f97db --- /dev/null +++ b/src/corelib/io/qwindowspipewriter_p.h @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** 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 |