qatomic.h

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2014 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 QATOMIC_H
#define QATOMIC_H

#include <QtCore/qglobal.h>
#include <QtCore/qbasicatomic.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

// High-level atomic integer operations
class Q_CORE_EXPORT QAtomicInt : public QBasicAtomicInt
{
public:
    inline QAtomicInt(int value = 0)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        _q_value = value;
    }
    inline QAtomicInt(const QAtomicInt &other)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        _q_value = other._q_value;
    }

    inline QAtomicInt &operator=(int value)
    {
        (void) QBasicAtomicInt::operator=(value);
        return *this;
    }

    inline QAtomicInt &operator=(const QAtomicInt &other)
    {
        (void) QBasicAtomicInt::operator=(other);
        return *this;
    }

#ifdef qdoc
    bool operator==(int value) const;
    bool operator!=(int value) const;
    bool operator!() const;
    operator int() const;

    static bool isReferenceCountingNative();
    static bool isReferenceCountingWaitFree();

    bool ref();
    bool deref();

    static bool isTestAndSetNative();
    static bool isTestAndSetWaitFree();

    bool testAndSetRelaxed(int expectedValue, int newValue);
    bool testAndSetAcquire(int expectedValue, int newValue);
    bool testAndSetRelease(int expectedValue, int newValue);
    bool testAndSetOrdered(int expectedValue, int newValue);

    static bool isFetchAndStoreNative();
    static bool isFetchAndStoreWaitFree();

    int fetchAndStoreRelaxed(int newValue);
    int fetchAndStoreAcquire(int newValue);
    int fetchAndStoreRelease(int newValue);
    int fetchAndStoreOrdered(int newValue);

    static bool isFetchAndAddNative();
    static bool isFetchAndAddWaitFree();

    int fetchAndAddRelaxed(int valueToAdd);
    int fetchAndAddAcquire(int valueToAdd);
    int fetchAndAddRelease(int valueToAdd);
    int fetchAndAddOrdered(int valueToAdd);
#endif
};

// High-level atomic pointer operations
template <typename T>
class QAtomicPointer : public QBasicAtomicPointer<T>
{
public:
    inline QAtomicPointer(T *value = 0)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        QBasicAtomicPointer<T>::_q_value = value;
    }
    inline QAtomicPointer(const QAtomicPointer<T> &other)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        QBasicAtomicPointer<T>::_q_value = other._q_value;
    }

    inline QAtomicPointer<T> &operator=(T *value)
    {
        (void) QBasicAtomicPointer<T>::operator=(value);
        return *this;
    }

    inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other)
    {
        (void) QBasicAtomicPointer<T>::operator=(other);
        return *this;
    }

#ifdef qdoc
    bool operator==(T *value) const;
    bool operator!=(T *value) const;
    bool operator!() const;
    operator T *() const;
    T *operator->() const;

    static bool isTestAndSetNative();
    static bool isTestAndSetWaitFree();

    bool testAndSetRelaxed(T *expectedValue, T *newValue);
    bool testAndSetAcquire(T *expectedValue, T *newValue);
    bool testAndSetRelease(T *expectedValue, T *newValue);
    bool testAndSetOrdered(T *expectedValue, T *newValue);

    static bool isFetchAndStoreNative();
    static bool isFetchAndStoreWaitFree();

    T *fetchAndStoreRelaxed(T *newValue);
    T *fetchAndStoreAcquire(T *newValue);
    T *fetchAndStoreRelease(T *newValue);
    T *fetchAndStoreOrdered(T *newValue);

    static bool isFetchAndAddNative();
    static bool isFetchAndAddWaitFree();

    T *fetchAndAddRelaxed(qptrdiff valueToAdd);
    T *fetchAndAddAcquire(qptrdiff valueToAdd);
    T *fetchAndAddRelease(qptrdiff valueToAdd);
    T *fetchAndAddOrdered(qptrdiff valueToAdd);
#endif
};

template <typename T>
inline void qAtomicAssign(T *&d, T *x)
{
    if (d == x)
        return;
    x->ref.ref();
    if (!d->ref.deref())
        delete d;
    d = x;
}

template <typename T>
inline void qAtomicDetach(T *&d)
{
    if (d->ref == 1)
        return;
    T *x = d;
    d = new T(*d);
    if (!x->ref.deref())
        delete x;
}

QT_END_NAMESPACE
QT_END_HEADER

#endif // QATOMIC_H