author | eckhart.koppen@nokia.com |
Wed, 31 Mar 2010 11:06:36 +0300 | |
changeset 7 | f7bc934e204c |
parent 0 | 1918ee327afb |
permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
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changeset
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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** |
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** This file is part of the QtCore module of the Qt Toolkit. |
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** |
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** $QT_BEGIN_LICENSE:LGPL$ |
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** No Commercial Usage |
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** This file contains pre-release code and may not be distributed. |
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** You may use this file in accordance with the terms and conditions |
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** contained in the Technology Preview License Agreement accompanying |
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** this package. |
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** |
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** GNU Lesser General Public License Usage |
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** Alternatively, this file may be used under the terms of the GNU Lesser |
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** General Public License version 2.1 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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#include "qwaitcondition.h" |
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#include "qnamespace.h" |
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#include "qmutex.h" |
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#include "qreadwritelock.h" |
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#include "qlist.h" |
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#include "qalgorithms.h" |
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#include "qt_windows.h" |
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#ifndef QT_NO_THREAD |
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#define Q_MUTEX_T void* |
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#include <private/qmutex_p.h> |
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#include <private/qreadwritelock_p.h> |
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QT_BEGIN_NAMESPACE |
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//*********************************************************************** |
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// QWaitConditionPrivate |
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// ********************************************************************** |
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class QWaitConditionEvent |
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{ |
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public: |
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inline QWaitConditionEvent() : priority(0), wokenUp(false) |
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{ |
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event = CreateEvent(NULL, TRUE, FALSE, NULL); |
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} |
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inline ~QWaitConditionEvent() { CloseHandle(event); } |
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int priority; |
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bool wokenUp; |
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HANDLE event; |
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}; |
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typedef QList<QWaitConditionEvent *> EventQueue; |
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class QWaitConditionPrivate |
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{ |
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public: |
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QMutex mtx; |
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EventQueue queue; |
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EventQueue freeQueue; |
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QWaitConditionEvent *pre(); |
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bool wait(QWaitConditionEvent *wce, unsigned long time); |
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void post(QWaitConditionEvent *wce, bool ret); |
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}; |
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QWaitConditionEvent *QWaitConditionPrivate::pre() |
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{ |
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mtx.lock(); |
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QWaitConditionEvent *wce = |
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freeQueue.isEmpty() ? new QWaitConditionEvent : freeQueue.takeFirst(); |
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wce->priority = GetThreadPriority(GetCurrentThread()); |
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wce->wokenUp = false; |
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// insert 'wce' into the queue (sorted by priority) |
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int index = 0; |
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for (; index < queue.size(); ++index) { |
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QWaitConditionEvent *current = queue.at(index); |
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if (current->priority < wce->priority) |
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break; |
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} |
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queue.insert(index, wce); |
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mtx.unlock(); |
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return wce; |
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} |
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bool QWaitConditionPrivate::wait(QWaitConditionEvent *wce, unsigned long time) |
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{ |
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// wait for the event |
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bool ret = false; |
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switch (WaitForSingleObject(wce->event, time)) { |
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default: break; |
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case WAIT_OBJECT_0: |
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ret = true; |
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break; |
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} |
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return ret; |
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} |
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void QWaitConditionPrivate::post(QWaitConditionEvent *wce, bool ret) |
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{ |
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mtx.lock(); |
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// remove 'wce' from the queue |
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queue.removeAll(wce); |
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ResetEvent(wce->event); |
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freeQueue.append(wce); |
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// wakeups delivered after the timeout should be forwarded to the next waiter |
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if (!ret && wce->wokenUp && !queue.isEmpty()) { |
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QWaitConditionEvent *other = queue.first(); |
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SetEvent(other->event); |
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other->wokenUp = true; |
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} |
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mtx.unlock(); |
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} |
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//*********************************************************************** |
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// QWaitCondition implementation |
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//*********************************************************************** |
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QWaitCondition::QWaitCondition() |
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{ |
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d = new QWaitConditionPrivate; |
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} |
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QWaitCondition::~QWaitCondition() |
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{ |
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if (!d->queue.isEmpty()) { |
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qWarning("QWaitCondition: Destroyed while threads are still waiting"); |
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qDeleteAll(d->queue); |
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} |
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qDeleteAll(d->freeQueue); |
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delete d; |
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} |
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bool QWaitCondition::wait(QMutex *mutex, unsigned long time) |
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{ |
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if (!mutex) |
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return false; |
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if (mutex->d->recursive) { |
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qWarning("QWaitCondition::wait: Cannot wait on recursive mutexes"); |
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return false; |
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} |
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QWaitConditionEvent *wce = d->pre(); |
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mutex->unlock(); |
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bool returnValue = d->wait(wce, time); |
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mutex->lock(); |
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d->post(wce, returnValue); |
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return returnValue; |
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} |
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bool QWaitCondition::wait(QReadWriteLock *readWriteLock, unsigned long time) |
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{ |
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if (!readWriteLock || readWriteLock->d->accessCount == 0) |
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return false; |
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if (readWriteLock->d->accessCount < -1) { |
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qWarning("QWaitCondition: cannot wait on QReadWriteLocks with recursive lockForWrite()"); |
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return false; |
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} |
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QWaitConditionEvent *wce = d->pre(); |
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int previousAccessCount = readWriteLock->d->accessCount; |
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readWriteLock->unlock(); |
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bool returnValue = d->wait(wce, time); |
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if (previousAccessCount < 0) |
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readWriteLock->lockForWrite(); |
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else |
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readWriteLock->lockForRead(); |
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d->post(wce, returnValue); |
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return returnValue; |
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} |
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void QWaitCondition::wakeOne() |
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{ |
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// wake up the first waiting thread in the queue |
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QMutexLocker locker(&d->mtx); |
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for (int i = 0; i < d->queue.size(); ++i) { |
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QWaitConditionEvent *current = d->queue.at(i); |
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if (current->wokenUp) |
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continue; |
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SetEvent(current->event); |
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current->wokenUp = true; |
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break; |
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} |
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} |
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void QWaitCondition::wakeAll() |
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{ |
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// wake up the all threads in the queue |
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QMutexLocker locker(&d->mtx); |
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for (int i = 0; i < d->queue.size(); ++i) { |
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QWaitConditionEvent *current = d->queue.at(i); |
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SetEvent(current->event); |
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current->wokenUp = true; |
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} |
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} |
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QT_END_NAMESPACE |
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#endif // QT_NO_THREAD |