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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 "qtconcurrentthreadengine.h"
#ifndef QT_NO_CONCURRENT
QT_BEGIN_NAMESPACE
namespace QtConcurrent {
ThreadEngineBase::ThreadEngineBase()
:futureInterface(0), threadPool(QThreadPool::globalInstance())
{
setAutoDelete(false);
}
ThreadEngineBase::~ThreadEngineBase() {}
void ThreadEngineBase::startSingleThreaded()
{
start();
while (threadFunction() != ThreadFinished)
;
finish();
}
void ThreadEngineBase::startBlocking()
{
start();
semaphore.acquire();
startThreads();
bool throttled = false;
#ifndef QT_NO_EXCEPTIONS
try {
#endif
while (threadFunction() == ThrottleThread) {
if (threadThrottleExit()) {
throttled = true;
break;
}
}
#ifndef QT_NO_EXCEPTIONS
} catch (QtConcurrent::Exception &e) {
handleException(e);
} catch (...) {
handleException(QtConcurrent::UnhandledException());
}
#endif
if (throttled == false) {
semaphore.release();
}
semaphore.wait();
finish();
exceptionStore.throwPossibleException();
}
void ThreadEngineBase::startThread()
{
startThreadInternal();
}
bool ThreadEngineBase::isCanceled()
{
if (futureInterface)
return futureInterface->isCanceled();
else
return false;
}
void ThreadEngineBase::waitForResume()
{
if (futureInterface)
futureInterface->waitForResume();
}
bool ThreadEngineBase::isProgressReportingEnabled()
{
// If we don't have a QFuture, there is no-one to report the progress to.
return (futureInterface != 0);
}
void ThreadEngineBase::setProgressValue(int progress)
{
if (futureInterface)
futureInterface->setProgressValue(progress);
}
void ThreadEngineBase::setProgressRange(int minimum, int maximum)
{
if (futureInterface)
futureInterface->setProgressRange(minimum, maximum);
}
bool ThreadEngineBase::startThreadInternal()
{
if (this->isCanceled())
return false;
semaphore.acquire();
if (!threadPool->tryStart(this)) {
semaphore.release();
return false;
}
return true;
}
void ThreadEngineBase::startThreads()
{
while (shouldStartThread() && startThreadInternal())
;
}
void ThreadEngineBase::threadExit()
{
const bool asynchronous = futureInterface != 0;
const int lastThread = (semaphore.release() == 0);
if (lastThread && asynchronous)
this->asynchronousFinish();
}
// Called by a worker thread that wants to be throttled. If the current number
// of running threads is larger than one the thread is allowed to exit and
// this function returns one.
bool ThreadEngineBase::threadThrottleExit()
{
return semaphore.releaseUnlessLast();
}
void ThreadEngineBase::run() // implements QRunnable.
{
if (this->isCanceled()) {
threadExit();
return;
}
startThreads();
#ifndef QT_NO_EXCEPTIONS
try {
#endif
while (threadFunction() == ThrottleThread) {
// threadFunction returning ThrottleThread means it that the user
// struct wants to be throttled by making a worker thread exit.
// Respect that request unless this is the only worker thread left
// running, in which case it has to keep going.
if (threadThrottleExit())
return;
}
#ifndef QT_NO_EXCEPTIONS
} catch (QtConcurrent::Exception &e) {
handleException(e);
} catch (...) {
handleException(QtConcurrent::UnhandledException());
}
#endif
threadExit();
}
#ifndef QT_NO_EXCEPTIONS
void ThreadEngineBase::handleException(const QtConcurrent::Exception &exception)
{
if (futureInterface)
futureInterface->reportException(exception);
else
exceptionStore.setException(exception);
}
#endif
} // namepsace QtConcurrent
QT_END_NAMESPACE
#endif // QT_NO_CONCURRENT
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