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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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qglobal.h>
#ifndef QATOMIC_H
#define QATOMIC_H
#include <QtCore/qbasicatomic.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && !defined(Q_CC_INTEL)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wextra"
#endif
// High-level atomic integer operations
class QAtomicInt : public QBasicAtomicInt
{
public:
// Non-atomic API
#ifdef Q_BASIC_ATOMIC_HAS_CONSTRUCTORS
constexpr QAtomicInt(int value = 0) Q_DECL_NOTHROW : QBasicAtomicInt(value) {}
#else
inline QAtomicInt(int value = 0) Q_DECL_NOTHROW
{
_q_value = value;
}
#endif
inline QAtomicInt(const QAtomicInt &other) Q_DECL_NOTHROW
{
store(other.load());
}
inline QAtomicInt &operator=(const QAtomicInt &other) Q_DECL_NOTHROW
{
this->store(other.load());
return *this;
}
#ifdef Q_QDOC
int load() const;
int loadAcquire() const;
void store(int newValue);
void storeRelease(int newValue);
static Q_DECL_CONSTEXPR bool isReferenceCountingNative();
static Q_DECL_CONSTEXPR bool isReferenceCountingWaitFree();
bool ref();
bool deref();
static Q_DECL_CONSTEXPR bool isTestAndSetNative();
static Q_DECL_CONSTEXPR 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 Q_DECL_CONSTEXPR bool isFetchAndStoreNative();
static Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree();
int fetchAndStoreRelaxed(int newValue);
int fetchAndStoreAcquire(int newValue);
int fetchAndStoreRelease(int newValue);
int fetchAndStoreOrdered(int newValue);
static Q_DECL_CONSTEXPR bool isFetchAndAddNative();
static Q_DECL_CONSTEXPR 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:
#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
constexpr QAtomicPointer(T *value = 0) Q_DECL_NOTHROW : QBasicAtomicPointer<T>(value) {}
#else
inline QAtomicPointer(T *value = 0) Q_DECL_NOTHROW
{
this->store(value);
}
#endif
inline QAtomicPointer(const QAtomicPointer<T> &other) Q_DECL_NOTHROW
{
this->store(other.load());
}
inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other) Q_DECL_NOTHROW
{
this->store(other.load());
return *this;
}
#ifdef Q_QDOC
T *load() const;
T *loadAcquire() const;
void store(T *newValue);
void storeRelease(T *newValue);
static Q_DECL_CONSTEXPR bool isTestAndSetNative();
static Q_DECL_CONSTEXPR 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 Q_DECL_CONSTEXPR bool isFetchAndStoreNative();
static Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree();
T *fetchAndStoreRelaxed(T *newValue);
T *fetchAndStoreAcquire(T *newValue);
T *fetchAndStoreRelease(T *newValue);
T *fetchAndStoreOrdered(T *newValue);
static Q_DECL_CONSTEXPR bool isFetchAndAddNative();
static Q_DECL_CONSTEXPR bool isFetchAndAddWaitFree();
T *fetchAndAddRelaxed(qptrdiff valueToAdd);
T *fetchAndAddAcquire(qptrdiff valueToAdd);
T *fetchAndAddRelease(qptrdiff valueToAdd);
T *fetchAndAddOrdered(qptrdiff valueToAdd);
#endif
};
#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && !defined(Q_CC_INTEL)
# pragma GCC diagnostic pop
#endif
#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
# undef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
#endif
/*!
This is a helper for the assignment operators of implicitly
shared classes. Your assignment operator should look like this:
\snippet code/src.corelib.thread.qatomic.h 0
*/
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;
}
/*!
This is a helper for the detach method of implicitly shared
classes. Your private class needs a copy constructor which copies
the members and sets the refcount to 1. After that, your detach
function should look like this:
\snippet code/src.corelib.thread.qatomic.h 1
*/
template <typename T>
inline void qAtomicDetach(T *&d)
{
if (d->ref.load() == 1)
return;
T *x = d;
d = new T(*d);
if (!x->ref.deref())
delete x;
}
QT_END_NAMESPACE
QT_END_HEADER
#endif // QATOMIC_H
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