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/****************************************************************************
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**
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** Copyright (C) 2009 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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#ifndef QMUTEX_H
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#define QMUTEX_H
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#include <QtCore/qglobal.h>
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#include <new>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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QT_MODULE(Core)
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#ifndef QT_NO_THREAD
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class QMutexPrivate;
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class Q_CORE_EXPORT QMutex
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{
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friend class QWaitCondition;
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friend class QWaitConditionPrivate;
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public:
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enum RecursionMode { NonRecursive, Recursive };
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explicit QMutex(RecursionMode mode = NonRecursive);
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~QMutex();
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void lock();
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bool tryLock();
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bool tryLock(int timeout);
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void unlock();
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#if defined(QT3_SUPPORT)
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inline QT3_SUPPORT bool locked()
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{
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if (!tryLock())
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return true;
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unlock();
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return false;
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}
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inline QT3_SUPPORT_CONSTRUCTOR QMutex(bool recursive)
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{
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new (this) QMutex(recursive ? Recursive : NonRecursive);
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}
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#endif
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private:
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Q_DISABLE_COPY(QMutex)
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QMutexPrivate *d;
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};
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class Q_CORE_EXPORT QMutexLocker
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{
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public:
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inline explicit QMutexLocker(QMutex *m)
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: mtx(m)
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{
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Q_ASSERT_X((val & quintptr(1u)) == quintptr(0),
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"QMutexLocker", "QMutex pointer is misaligned");
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relock();
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}
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inline ~QMutexLocker() { unlock(); }
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inline void unlock()
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{
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if (mtx) {
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if ((val & quintptr(1u)) == quintptr(1u)) {
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val &= ~quintptr(1u);
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mtx->unlock();
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}
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}
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}
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inline void relock()
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{
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if (mtx) {
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if ((val & quintptr(1u)) == quintptr(0u)) {
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mtx->lock();
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val |= quintptr(1u);
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}
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}
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}
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#if defined(Q_CC_MSVC)
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#pragma warning( push )
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#pragma warning( disable : 4312 ) // ignoring the warning from /Wp64
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#endif
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inline QMutex *mutex() const
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{
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return reinterpret_cast<QMutex *>(val & ~quintptr(1u));
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}
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#if defined(Q_CC_MSVC)
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#pragma warning( pop )
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#endif
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private:
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Q_DISABLE_COPY(QMutexLocker)
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union {
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QMutex *mtx;
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quintptr val;
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};
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};
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#else // QT_NO_THREAD
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class Q_CORE_EXPORT QMutex
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{
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public:
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enum RecursionMode { NonRecursive, Recursive };
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inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }
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inline ~QMutex() {}
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static inline void lock() {}
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static inline bool tryLock() { return true; }
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static inline bool tryLock(int timeout) { Q_UNUSED(timeout); return true; }
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static void unlock() {}
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#if defined(QT3_SUPPORT)
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static inline QT3_SUPPORT bool locked() { return false; }
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#endif
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private:
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Q_DISABLE_COPY(QMutex)
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};
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class Q_CORE_EXPORT QMutexLocker
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{
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public:
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inline explicit QMutexLocker(QMutex *) {}
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inline ~QMutexLocker() {}
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static inline void unlock() {}
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static void relock() {}
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static inline QMutex *mutex() { return 0; }
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private:
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Q_DISABLE_COPY(QMutexLocker)
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};
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#endif // QT_NO_THREAD
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif // QMUTEX_H
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