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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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_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
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