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Diffstat (limited to 'qtinterface/qt4/Qt/qreadwritelock.h')
| -rw-r--r-- | qtinterface/qt4/Qt/qreadwritelock.h | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/qtinterface/qt4/Qt/qreadwritelock.h b/qtinterface/qt4/Qt/qreadwritelock.h new file mode 100644 index 0000000..bc01ad5 --- /dev/null +++ b/qtinterface/qt4/Qt/qreadwritelock.h @@ -0,0 +1,245 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation ([email protected]) +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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. +** +** 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at [email protected]. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QREADWRITELOCK_H +#define QREADWRITELOCK_H + +#include <QtCore/qglobal.h> +#include <limits.h> // ### Qt 5: remove + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +QT_MODULE(Core) + +#ifndef QT_NO_THREAD + +struct QReadWriteLockPrivate; + +class Q_CORE_EXPORT QReadWriteLock +{ +public: + enum RecursionMode { NonRecursive, Recursive }; + + QReadWriteLock(); // ### Qt 5: merge with below + QReadWriteLock(RecursionMode recursionMode); + ~QReadWriteLock(); + + void lockForRead(); + bool tryLockForRead(); + bool tryLockForRead(int timeout); + + void lockForWrite(); + bool tryLockForWrite(); + bool tryLockForWrite(int timeout); + + void unlock(); + +private: + Q_DISABLE_COPY(QReadWriteLock) + QReadWriteLockPrivate *d; + + friend class QWaitCondition; +}; + +#if defined(Q_CC_MSVC) +#pragma warning( push ) +#pragma warning( disable : 4312 ) // ignoring the warning from /Wp64 +#endif + +class Q_CORE_EXPORT QReadLocker +{ +public: + inline QReadLocker(QReadWriteLock *readWriteLock); + + inline ~QReadLocker() + { unlock(); } + + inline void unlock() + { + if (q_lock) { + if ((q_val & quintptr(1u)) == quintptr(1u)) { + q_val &= ~quintptr(1u); + q_lock->unlock(); + } + } + } + + inline void relock() + { + if (q_lock) { + if ((q_val & quintptr(1u)) == quintptr(0u)) { + q_lock->lockForRead(); + q_val |= quintptr(1u); + } + } + } + + inline QReadWriteLock *readWriteLock() const + { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); } + +private: + Q_DISABLE_COPY(QReadLocker) + union { + QReadWriteLock *q_lock; + quintptr q_val; + }; +}; + +inline QReadLocker::QReadLocker(QReadWriteLock *areadWriteLock) + : q_lock(areadWriteLock) +{ + Q_ASSERT_X((q_val & quintptr(1u)) == quintptr(0), + "QReadLocker", "QReadWriteLock pointer is misaligned"); + relock(); +} + +class Q_CORE_EXPORT QWriteLocker +{ +public: + inline QWriteLocker(QReadWriteLock *readWriteLock); + + inline ~QWriteLocker() + { unlock(); } + + inline void unlock() + { + if (q_lock) { + if ((q_val & quintptr(1u)) == quintptr(1u)) { + q_val &= ~quintptr(1u); + q_lock->unlock(); + } + } + } + + inline void relock() + { + if (q_lock) { + if ((q_val & quintptr(1u)) == quintptr(0u)) { + q_lock->lockForWrite(); + q_val |= quintptr(1u); + } + } + } + + inline QReadWriteLock *readWriteLock() const + { return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); } + + +private: + Q_DISABLE_COPY(QWriteLocker) + union{ + QReadWriteLock *q_lock; + quintptr q_val; + }; +}; + +inline QWriteLocker::QWriteLocker(QReadWriteLock *areadWriteLock) + : q_lock(areadWriteLock) +{ + Q_ASSERT_X((q_val & quintptr(1u)) == quintptr(0), + "QWriteLocker", "QReadWriteLock pointer is misaligned"); + relock(); +} + +#if defined(Q_CC_MSVC) +#pragma warning( pop ) +#endif + +#else // QT_NO_THREAD + +class Q_CORE_EXPORT QReadWriteLock +{ +public: + enum RecursionMode { NonRecursive, Recursive }; + inline explicit QReadWriteLock(RecursionMode = NonRecursive) { } + inline ~QReadWriteLock() { } + + static inline void lockForRead() { } + static inline bool tryLockForRead() { return true; } + static inline bool tryLockForRead(int timeout) { Q_UNUSED(timeout); return true; } + + static inline void lockForWrite() { } + static inline bool tryLockForWrite() { return true; } + static inline bool tryLockForWrite(int timeout) { Q_UNUSED(timeout); return true; } + + static inline void unlock() { } + +private: + Q_DISABLE_COPY(QReadWriteLock) +}; + +class Q_CORE_EXPORT QReadLocker +{ +public: + inline QReadLocker(QReadWriteLock *) { } + inline ~QReadLocker() { } + + static inline void unlock() { } + static inline void relock() { } + static inline QReadWriteLock *readWriteLock() { return 0; } + +private: + Q_DISABLE_COPY(QReadLocker) +}; + +class Q_CORE_EXPORT QWriteLocker +{ +public: + inline explicit QWriteLocker(QReadWriteLock *) { } + inline ~QWriteLocker() { } + + static inline void unlock() { } + static inline void relock() { } + static inline QReadWriteLock *readWriteLock() { return 0; } + +private: + Q_DISABLE_COPY(QWriteLocker) +}; + +#endif // QT_NO_THREAD + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif // QREADWRITELOCK_H |