/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtCore module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#ifndef QMUTEX_H#define QMUTEX_H#include <QtCore/qglobal.h>#include <new>QT_BEGIN_HEADERQT_MODULE(Core)#ifndef QT_NO_THREADclass QMutexPrivate;class Q_CORE_EXPORT QMutex{    friend class QWaitCondition;    friend class QWaitConditionPrivate;public:    enum RecursionMode { NonRecursive, Recursive };    explicit QMutex(RecursionMode mode = NonRecursive);    ~QMutex();    void lock();    bool tryLock();    void unlock();#if defined(QT3_SUPPORT)    inline QT3_SUPPORT bool locked()    {        if (!tryLock())            return true;        unlock();        return false;    }    inline QT3_SUPPORT_CONSTRUCTOR QMutex(bool recursive)    {        new (this) QMutex(recursive ? Recursive : NonRecursive);    }#endifprivate:    Q_DISABLE_COPY(QMutex)    QMutexPrivate *d;};class Q_CORE_EXPORT QMutexLocker{public:    inline explicit QMutexLocker(QMutex *m) : mtx(m) { relock(); }    inline ~QMutexLocker() { unlock(); }    inline void unlock()    {        if (mtx) {            if ((val & quintptr(1u)) == quintptr(1u)) {                val &= ~quintptr(1u);                mtx->unlock();            }        }    }    inline void relock()    {        if (mtx) {            if ((val & quintptr(1u)) == quintptr(0u)) {                mtx->lock();                val |= quintptr(1u);            }        }    }    inline QMutex *mutex() const    {        return reinterpret_cast<QMutex *>(val & ~quintptr(1u));    }private:    Q_DISABLE_COPY(QMutexLocker)    union {        QMutex *mtx;        quintptr val;    };};#else // QT_NO_THREADclass Q_CORE_EXPORT QMutex{public:    enum RecursionMode { NonRecursive, Recursive };    inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }    inline ~QMutex() {}    static inline void lock() {}    static inline bool tryLock() { return true; }    static void unlock() {}#if defined(QT3_SUPPORT)    static inline QT3_SUPPORT bool locked() { return false; }#endifprivate:    Q_DISABLE_COPY(QMutex)};class Q_CORE_EXPORT QMutexLocker{public:    inline explicit QMutexLocker(QMutex *) {}    inline ~QMutexLocker() {}    static inline void unlock() {}    static void relock() {}    static inline QMutex *mutex() { return 0; }private:    Q_DISABLE_COPY(QMutexLocker)};#endif // QT_NO_THREADQT_END_HEADER#endif // QMUTEX_H