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Diffstat (limited to 'src/corelib/thread/qwaitcondition_win.cpp')
-rw-r--r-- | src/corelib/thread/qwaitcondition_win.cpp | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/corelib/thread/qwaitcondition_win.cpp b/src/corelib/thread/qwaitcondition_win.cpp new file mode 100644 index 0000000000..ee1c7ba01f --- /dev/null +++ b/src/corelib/thread/qwaitcondition_win.cpp @@ -0,0 +1,233 @@ +/**************************************************************************** +** +** Copyright (C) 2011 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 "qwaitcondition.h" +#include "qnamespace.h" +#include "qmutex.h" +#include "qreadwritelock.h" +#include "qlist.h" +#include "qalgorithms.h" +#include "qt_windows.h" + +#ifndef QT_NO_THREAD + +#define Q_MUTEX_T void* +#include <private/qmutex_p.h> +#include <private/qreadwritelock_p.h> + +QT_BEGIN_NAMESPACE + +//*********************************************************************** +// QWaitConditionPrivate +// ********************************************************************** + +class QWaitConditionEvent +{ +public: + inline QWaitConditionEvent() : priority(0), wokenUp(false) + { + event = CreateEvent(NULL, TRUE, FALSE, NULL); + } + inline ~QWaitConditionEvent() { CloseHandle(event); } + int priority; + bool wokenUp; + HANDLE event; +}; + +typedef QList<QWaitConditionEvent *> EventQueue; + +class QWaitConditionPrivate +{ +public: + QMutex mtx; + EventQueue queue; + EventQueue freeQueue; + + QWaitConditionEvent *pre(); + bool wait(QWaitConditionEvent *wce, unsigned long time); + void post(QWaitConditionEvent *wce, bool ret); +}; + +QWaitConditionEvent *QWaitConditionPrivate::pre() +{ + mtx.lock(); + QWaitConditionEvent *wce = + freeQueue.isEmpty() ? new QWaitConditionEvent : freeQueue.takeFirst(); + wce->priority = GetThreadPriority(GetCurrentThread()); + wce->wokenUp = false; + + // insert 'wce' into the queue (sorted by priority) + int index = 0; + for (; index < queue.size(); ++index) { + QWaitConditionEvent *current = queue.at(index); + if (current->priority < wce->priority) + break; + } + queue.insert(index, wce); + mtx.unlock(); + + return wce; +} + +bool QWaitConditionPrivate::wait(QWaitConditionEvent *wce, unsigned long time) +{ + // wait for the event + bool ret = false; + switch (WaitForSingleObject(wce->event, time)) { + default: break; + + case WAIT_OBJECT_0: + ret = true; + break; + } + return ret; +} + +void QWaitConditionPrivate::post(QWaitConditionEvent *wce, bool ret) +{ + mtx.lock(); + + // remove 'wce' from the queue + queue.removeAll(wce); + ResetEvent(wce->event); + freeQueue.append(wce); + + // wakeups delivered after the timeout should be forwarded to the next waiter + if (!ret && wce->wokenUp && !queue.isEmpty()) { + QWaitConditionEvent *other = queue.first(); + SetEvent(other->event); + other->wokenUp = true; + } + + mtx.unlock(); +} + +//*********************************************************************** +// QWaitCondition implementation +//*********************************************************************** + +QWaitCondition::QWaitCondition() +{ + d = new QWaitConditionPrivate; +} + +QWaitCondition::~QWaitCondition() +{ + if (!d->queue.isEmpty()) { + qWarning("QWaitCondition: Destroyed while threads are still waiting"); + qDeleteAll(d->queue); + } + + qDeleteAll(d->freeQueue); + delete d; +} + +bool QWaitCondition::wait(QMutex *mutex, unsigned long time) +{ + if (!mutex) + return false; + if (mutex->d->recursive) { + qWarning("QWaitCondition::wait: Cannot wait on recursive mutexes"); + return false; + } + + QWaitConditionEvent *wce = d->pre(); + mutex->unlock(); + + bool returnValue = d->wait(wce, time); + + mutex->lock(); + d->post(wce, returnValue); + + return returnValue; +} + +bool QWaitCondition::wait(QReadWriteLock *readWriteLock, unsigned long time) +{ + if (!readWriteLock || readWriteLock->d->accessCount == 0) + return false; + if (readWriteLock->d->accessCount < -1) { + qWarning("QWaitCondition: cannot wait on QReadWriteLocks with recursive lockForWrite()"); + return false; + } + + QWaitConditionEvent *wce = d->pre(); + int previousAccessCount = readWriteLock->d->accessCount; + readWriteLock->unlock(); + + bool returnValue = d->wait(wce, time); + + if (previousAccessCount < 0) + readWriteLock->lockForWrite(); + else + readWriteLock->lockForRead(); + d->post(wce, returnValue); + + return returnValue; +} + +void QWaitCondition::wakeOne() +{ + // wake up the first waiting thread in the queue + QMutexLocker locker(&d->mtx); + for (int i = 0; i < d->queue.size(); ++i) { + QWaitConditionEvent *current = d->queue.at(i); + if (current->wokenUp) + continue; + SetEvent(current->event); + current->wokenUp = true; + break; + } +} + +void QWaitCondition::wakeAll() +{ + // wake up the all threads in the queue + QMutexLocker locker(&d->mtx); + for (int i = 0; i < d->queue.size(); ++i) { + QWaitConditionEvent *current = d->queue.at(i); + SetEvent(current->event); + current->wokenUp = true; + } +} + +QT_END_NAMESPACE +#endif // QT_NO_THREAD |