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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMUTEX_H
#define QMUTEX_H
#include <QtCore/qglobal.h>
#include <QtCore/qatomic.h>
#include <new>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Core)
#ifndef QT_NO_THREAD
class QAtomicInt;
class QMutexData;
class Q_CORE_EXPORT QMutex
{
friend class QWaitCondition;
friend class QWaitConditionPrivate;
public:
enum RecursionMode { NonRecursive, Recursive };
explicit QMutex(RecursionMode mode = NonRecursive);
~QMutex();
void lock(); //### Qt5: make inline;
inline void lockInline();
bool tryLock(); //### Qt5: make inline;
bool tryLock(int timeout);
inline bool tryLockInline();
void unlock(); //### Qt5: make inline;
inline void unlockInline();
#if defined(QT3_SUPPORT)
inline QT3_SUPPORT bool locked()
{
if (!tryLock())
return true;
unlock();
return false;
}
inline QT3_SUPPORT_CONSTRUCTOR QMutex(bool recursive)
{
new (this) QMutex(recursive ? Recursive : NonRecursive);
}
#endif
private:
void lockInternal();
void unlockInternal();
Q_DISABLE_COPY(QMutex)
QMutexData *d;
};
class Q_CORE_EXPORT QMutexLocker
{
public:
inline explicit QMutexLocker(QMutex *m)
{
Q_ASSERT_X((reinterpret_cast<quintptr>(m) & quintptr(1u)) == quintptr(0),
"QMutexLocker", "QMutex pointer is misaligned");
if (m) {
m->lockInline();
val = reinterpret_cast<quintptr>(m) | quintptr(1u);
} else {
val = 0;
}
}
inline ~QMutexLocker() { unlock(); }
inline void unlock()
{
if ((val & quintptr(1u)) == quintptr(1u)) {
val &= ~quintptr(1u);
mutex()->unlockInline();
}
}
inline void relock()
{
if (val) {
if ((val & quintptr(1u)) == quintptr(0u)) {
mutex()->lockInline();
val |= quintptr(1u);
}
}
}
#if defined(Q_CC_MSVC)
#pragma warning( push )
#pragma warning( disable : 4312 ) // ignoring the warning from /Wp64
#endif
inline QMutex *mutex() const
{
return reinterpret_cast<QMutex *>(val & ~quintptr(1u));
}
#if defined(Q_CC_MSVC)
#pragma warning( pop )
#endif
private:
Q_DISABLE_COPY(QMutexLocker)
quintptr val;
};
class QMutexData
{
public:
QAtomicInt contenders;
const uint recursive : 1;
uint reserved : 31;
protected:
QMutexData(QMutex::RecursionMode mode);
~QMutexData();
};
inline void QMutex::unlockInline()
{
if (d->recursive) {
unlock();
} else if (!d->contenders.testAndSetRelease(1, 0)) {
unlockInternal();
}
}
inline bool QMutex::tryLockInline()
{
if (d->recursive) {
return tryLock();
} else {
return d->contenders.testAndSetAcquire(0, 1);
}
}
inline void QMutex::lockInline()
{
if (d->recursive) {
lock();
} else if(!tryLockInline()) {
lockInternal();
}
}
#else // QT_NO_THREAD
class Q_CORE_EXPORT QMutex
{
public:
enum RecursionMode { NonRecursive, Recursive };
inline explicit QMutex(RecursionMode mode = NonRecursive) { Q_UNUSED(mode); }
inline ~QMutex() {}
static inline void lock() {}
static inline void lockInline() {}
static inline bool tryLock(int timeout = 0) { Q_UNUSED(timeout); return true; }
static inline bool tryLockInline() { return true; }
static inline void unlock() {}
static inline void unlockInline() {}
#if defined(QT3_SUPPORT)
static inline QT3_SUPPORT bool locked() { return false; }
#endif
private:
Q_DISABLE_COPY(QMutex)
};
class Q_CORE_EXPORT QMutexLocker
{
public:
inline explicit QMutexLocker(QMutex *) {}
inline ~QMutexLocker() {}
static inline void unlock() {}
static void relock() {}
static inline QMutex *mutex() { return 0; }
private:
Q_DISABLE_COPY(QMutexLocker)
};
#endif // QT_NO_THREAD
QT_END_NAMESPACE
QT_END_HEADER
#endif // QMUTEX_H
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