/**************************************************************************** | |
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** Contact: Nokia Corporation (qt-info@nokia.com) | |
** | |
** This file is part of the QtCore module of the Qt Toolkit. | |
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** $QT_BEGIN_LICENSE:LGPL$ | |
** GNU Lesser General Public License Usage | |
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** file. Please review the following information to ensure the GNU Lesser | |
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** 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: | |
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** $QT_END_LICENSE$ | |
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****************************************************************************/ | |
#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_val) { | |
if ((q_val & quintptr(1u)) == quintptr(1u)) { | |
q_val &= ~quintptr(1u); | |
readWriteLock()->unlock(); | |
} | |
} | |
} | |
inline void relock() | |
{ | |
if (q_val) { | |
if ((q_val & quintptr(1u)) == quintptr(0u)) { | |
readWriteLock()->lockForRead(); | |
q_val |= quintptr(1u); | |
} | |
} | |
} | |
inline QReadWriteLock *readWriteLock() const | |
{ return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); } | |
private: | |
Q_DISABLE_COPY(QReadLocker) | |
quintptr q_val; | |
}; | |
inline QReadLocker::QReadLocker(QReadWriteLock *areadWriteLock) | |
: q_val(reinterpret_cast<quintptr>(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_val) { | |
if ((q_val & quintptr(1u)) == quintptr(1u)) { | |
q_val &= ~quintptr(1u); | |
readWriteLock()->unlock(); | |
} | |
} | |
} | |
inline void relock() | |
{ | |
if (q_val) { | |
if ((q_val & quintptr(1u)) == quintptr(0u)) { | |
readWriteLock()->lockForWrite(); | |
q_val |= quintptr(1u); | |
} | |
} | |
} | |
inline QReadWriteLock *readWriteLock() const | |
{ return reinterpret_cast<QReadWriteLock *>(q_val & ~quintptr(1u)); } | |
private: | |
Q_DISABLE_COPY(QWriteLocker) | |
quintptr q_val; | |
}; | |
inline QWriteLocker::QWriteLocker(QReadWriteLock *areadWriteLock) | |
: q_val(reinterpret_cast<quintptr>(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 |