| /**************************************************************************** |
| ** |
| ** 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. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** 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. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU General |
| ** Public License version 3.0 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 the GNU General |
| ** Public License version 3.0 requirements will be met: |
| ** http://www.gnu.org/copyleft/gpl.html. |
| ** |
| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
| ** |
| ** |
| ** |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #ifndef QMUTEX_H |
| #define QMUTEX_H |
| |
| #include <QtCore/qglobal.h> |
| #include <new> |
| |
| QT_BEGIN_HEADER |
| |
| QT_BEGIN_NAMESPACE |
| |
| QT_MODULE(Core) |
| |
| #ifndef QT_NO_THREAD |
| |
| class 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(); |
| bool tryLock(int timeout); |
| 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); |
| } |
| #endif |
| |
| private: |
| Q_DISABLE_COPY(QMutex) |
| |
| QMutexPrivate *d; |
| }; |
| |
| class Q_CORE_EXPORT QMutexLocker |
| { |
| public: |
| inline explicit QMutexLocker(QMutex *m) |
| { |
| Q_ASSERT_X((reinterpret_cast<quintptr>(m) & quintptr(1u)) == quintptr(0), |
| "QMutexLocker", "QMutex pointer is misaligned"); |
| if (m) { |
| m->lock(); |
| val = reinterpret_cast<quintptr>(m) | quintptr(1u); |
| } else { |
| val = 0; |
| } |
| } |
| inline ~QMutexLocker() { unlock(); } |
| |
| inline void unlock() |
| { |
| if ((val & quintptr(1u)) == quintptr(1u)) { |
| val &= ~quintptr(1u); |
| mutex()->unlock(); |
| } |
| } |
| |
| inline void relock() |
| { |
| if (val) { |
| if ((val & quintptr(1u)) == quintptr(0u)) { |
| mutex()->lock(); |
| val |= quintptr(1u); |
| } |
| } |
| } |
| |
| #if defined(Q_CC_MSVC) |
| #pragma warning( push ) |
| #pragma warning( disable : 4312 ) // ignoring the warning from /Wp64 |
| #endif |
| |
| inline QMutex *mutex() const |
| { |
| return reinterpret_cast<QMutex *>(val & ~quintptr(1u)); |
| } |
| |
| #if defined(Q_CC_MSVC) |
| #pragma warning( pop ) |
| #endif |
| |
| private: |
| Q_DISABLE_COPY(QMutexLocker) |
| |
| quintptr val; |
| }; |
| |
| #else // QT_NO_THREAD |
| |
| |
| class 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 inline bool tryLock(int timeout) { Q_UNUSED(timeout); return true; } |
| static void unlock() {} |
| |
| #if defined(QT3_SUPPORT) |
| static inline QT3_SUPPORT bool locked() { return false; } |
| #endif |
| |
| private: |
| 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_THREAD |
| |
| QT_END_NAMESPACE |
| |
| QT_END_HEADER |
| |
| #endif // QMUTEX_H |