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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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 are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#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
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