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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qwindowspipewriter_p.h"
QT_BEGIN_NAMESPACE
#ifndef QT_NO_THREAD
QWindowsPipeWriter::QWindowsPipeWriter(HANDLE pipe, QObject * parent)
: QThread(parent),
writePipe(INVALID_HANDLE_VALUE),
quitNow(false),
hasWritten(false)
{
#if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)
DuplicateHandle(GetCurrentProcess(), pipe, GetCurrentProcess(),
&writePipe, 0, FALSE, DUPLICATE_SAME_ACCESS);
#else
Q_UNUSED(pipe);
writePipe = GetCurrentProcess();
#endif
}
QWindowsPipeWriter::~QWindowsPipeWriter()
{
lock.lock();
quitNow = true;
waitCondition.wakeOne();
lock.unlock();
if (!wait(100))
terminate();
#if !defined(Q_OS_WINCE) || (_WIN32_WCE >= 0x600)
CloseHandle(writePipe);
#endif
}
bool QWindowsPipeWriter::waitForWrite(int msecs)
{
QMutexLocker locker(&lock);
bool hadWritten = hasWritten;
hasWritten = false;
if (hadWritten)
return true;
if (!waitCondition.wait(&lock, msecs))
return false;
hadWritten = hasWritten;
hasWritten = false;
return hadWritten;
}
qint64 QWindowsPipeWriter::write(const char *ptr, qint64 maxlen)
{
if (!isRunning())
return -1;
QMutexLocker locker(&lock);
data.append(QByteArray(ptr, maxlen));
waitCondition.wakeOne();
return maxlen;
}
void QWindowsPipeWriter::run()
{
OVERLAPPED overl = {0, 0, 0, 0, NULL};
overl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
forever {
lock.lock();
while(data.isEmpty() && (!quitNow)) {
waitCondition.wakeOne();
waitCondition.wait(&lock);
}
if (quitNow) {
lock.unlock();
quitNow = false;
break;
}
QByteArray copy = data;
lock.unlock();
const char *ptrData = copy.data();
qint64 maxlen = copy.size();
qint64 totalWritten = 0;
overl.Offset = 0;
overl.OffsetHigh = 0;
while ((!quitNow) && totalWritten < maxlen) {
DWORD written = 0;
// Write 2k at a time to prevent flooding the pipe. If you
// write too much (4k-8k), the pipe can close
// unexpectedly.
if (!WriteFile(writePipe, ptrData + totalWritten,
qMin<int>(2048, maxlen - totalWritten), &written, &overl)) {
if (GetLastError() == 0xE8/*NT_STATUS_INVALID_USER_BUFFER*/) {
// give the os a rest
msleep(100);
continue;
}
#ifndef Q_OS_WINCE
if (GetLastError() == ERROR_IO_PENDING) {
if (!GetOverlappedResult(writePipe, &overl, &written, TRUE)) {
CloseHandle(overl.hEvent);
return;
}
} else {
CloseHandle(overl.hEvent);
return;
}
#else
return;
#endif
}
totalWritten += written;
#if defined QPIPEWRITER_DEBUG
qDebug("QWindowsPipeWriter::run() wrote %d %d/%d bytes",
written, int(totalWritten), int(maxlen));
#endif
lock.lock();
data.remove(0, written);
hasWritten = true;
lock.unlock();
}
emit bytesWritten(totalWritten);
emit canWrite();
}
CloseHandle(overl.hEvent);
}
#endif //QT_NO_THREAD
QT_END_NAMESPACE
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