qreadwritelock.h
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上传日期:2022-06-22
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- **
- ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
- ** Contact: Qt Software Information (qt-info@nokia.com)
- **
- ** This file is part of the QtCore module of the Qt Toolkit.
- **
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- ** accordance with the Qt Commercial License Agreement provided with the
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- **
- **
- ** GNU General Public License Usage
- ** Alternatively, this file may be used under the terms of the GNU
- ** General Public License versions 2.0 or 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
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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_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:
- inline explicit QReadWriteLock() { }
- 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