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257 lines
7.5 KiB
C++
257 lines
7.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore/qglobal.h>
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#ifndef QATOMIC_H
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#define QATOMIC_H
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#include <QtCore/qbasicatomic.h>
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QT_BEGIN_NAMESPACE
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QT_WARNING_PUSH
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QT_WARNING_DISABLE_GCC("-Wextra")
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// High-level atomic integer operations
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template <typename T>
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class QAtomicInteger : public QBasicAtomicInteger<T>
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{
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public:
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// Non-atomic API
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#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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constexpr QAtomicInteger(T value = 0) Q_DECL_NOTHROW : QBasicAtomicInteger<T>(value) {}
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#else
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inline QAtomicInteger(T value = 0) Q_DECL_NOTHROW
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{
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this->_q_value = value;
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}
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#endif
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inline QAtomicInteger(const QAtomicInteger &other) Q_DECL_NOTHROW
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#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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: QBasicAtomicInteger<T>()
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#endif
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{
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this->storeRelease(other.loadAcquire());
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}
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inline QAtomicInteger &operator=(const QAtomicInteger &other) Q_DECL_NOTHROW
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{
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this->storeRelease(other.loadAcquire());
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return *this;
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}
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#ifdef Q_QDOC
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T load() const;
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T loadAcquire() const;
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void store(T newValue);
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void storeRelease(T newValue);
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operator T() const;
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QAtomicInteger &operator=(T);
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static Q_DECL_CONSTEXPR bool isReferenceCountingNative();
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static Q_DECL_CONSTEXPR bool isReferenceCountingWaitFree();
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bool ref();
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bool deref();
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static Q_DECL_CONSTEXPR bool isTestAndSetNative();
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static Q_DECL_CONSTEXPR bool isTestAndSetWaitFree();
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bool testAndSetRelaxed(T expectedValue, T newValue);
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bool testAndSetAcquire(T expectedValue, T newValue);
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bool testAndSetRelease(T expectedValue, T newValue);
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bool testAndSetOrdered(T expectedValue, T newValue);
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static Q_DECL_CONSTEXPR bool isFetchAndStoreNative();
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static Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree();
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T fetchAndStoreRelaxed(T newValue);
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T fetchAndStoreAcquire(T newValue);
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T fetchAndStoreRelease(T newValue);
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T fetchAndStoreOrdered(T newValue);
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static Q_DECL_CONSTEXPR bool isFetchAndAddNative();
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static Q_DECL_CONSTEXPR bool isFetchAndAddWaitFree();
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T fetchAndAddRelaxed(T valueToAdd);
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T fetchAndAddAcquire(T valueToAdd);
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T fetchAndAddRelease(T valueToAdd);
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T fetchAndAddOrdered(T valueToAdd);
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T fetchAndSubRelaxed(T valueToSub);
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T fetchAndSubAcquire(T valueToSub);
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T fetchAndSubRelease(T valueToSub);
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T fetchAndSubOrdered(T valueToSub);
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T fetchAndOrRelaxed(T valueToOr);
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T fetchAndOrAcquire(T valueToOr);
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T fetchAndOrRelease(T valueToOr);
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T fetchAndOrOrdered(T valueToOr);
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T fetchAndAndRelaxed(T valueToAnd);
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T fetchAndAndAcquire(T valueToAnd);
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T fetchAndAndRelease(T valueToAnd);
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T fetchAndAndOrdered(T valueToAnd);
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T fetchAndXorRelaxed(T valueToXor);
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T fetchAndXorAcquire(T valueToXor);
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T fetchAndXorRelease(T valueToXor);
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T fetchAndXorOrdered(T valueToXor);
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T operator++();
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T operator++(int);
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T operator--();
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T operator--(int);
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T operator+=(T value);
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T operator-=(T value);
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T operator|=(T value);
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T operator&=(T value);
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T operator^=(T value);
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#endif
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};
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class QAtomicInt : public QAtomicInteger<int>
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{
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public:
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// Non-atomic API
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// We could use QT_COMPILER_INHERITING_CONSTRUCTORS, but we need only one;
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// the implicit definition for all the others is fine.
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#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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constexpr
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#endif
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QAtomicInt(int value = 0) Q_DECL_NOTHROW : QAtomicInteger<int>(value) {}
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};
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// High-level atomic pointer operations
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template <typename T>
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class QAtomicPointer : public QBasicAtomicPointer<T>
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{
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public:
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#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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constexpr QAtomicPointer(T *value = 0) Q_DECL_NOTHROW : QBasicAtomicPointer<T>(value) {}
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#else
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inline QAtomicPointer(T *value = 0) Q_DECL_NOTHROW
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{
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this->store(value);
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}
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#endif
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inline QAtomicPointer(const QAtomicPointer<T> &other) Q_DECL_NOTHROW
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{
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this->storeRelease(other.loadAcquire());
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}
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inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other) Q_DECL_NOTHROW
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{
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this->storeRelease(other.loadAcquire());
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return *this;
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}
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#ifdef Q_QDOC
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T *load() const;
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T *loadAcquire() const;
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void store(T *newValue);
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void storeRelease(T *newValue);
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static Q_DECL_CONSTEXPR bool isTestAndSetNative();
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static Q_DECL_CONSTEXPR bool isTestAndSetWaitFree();
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bool testAndSetRelaxed(T *expectedValue, T *newValue);
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bool testAndSetAcquire(T *expectedValue, T *newValue);
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bool testAndSetRelease(T *expectedValue, T *newValue);
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bool testAndSetOrdered(T *expectedValue, T *newValue);
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static Q_DECL_CONSTEXPR bool isFetchAndStoreNative();
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static Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree();
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T *fetchAndStoreRelaxed(T *newValue);
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T *fetchAndStoreAcquire(T *newValue);
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T *fetchAndStoreRelease(T *newValue);
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T *fetchAndStoreOrdered(T *newValue);
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static Q_DECL_CONSTEXPR bool isFetchAndAddNative();
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static Q_DECL_CONSTEXPR bool isFetchAndAddWaitFree();
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T *fetchAndAddRelaxed(qptrdiff valueToAdd);
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T *fetchAndAddAcquire(qptrdiff valueToAdd);
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T *fetchAndAddRelease(qptrdiff valueToAdd);
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T *fetchAndAddOrdered(qptrdiff valueToAdd);
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#endif
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};
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QT_WARNING_POP
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#ifdef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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# undef QT_BASIC_ATOMIC_HAS_CONSTRUCTORS
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#endif
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/*!
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This is a helper for the assignment operators of implicitly
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shared classes. Your assignment operator should look like this:
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\snippet code/src.corelib.thread.qatomic.h 0
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*/
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template <typename T>
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inline void qAtomicAssign(T *&d, T *x)
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{
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if (d == x)
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return;
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x->ref.ref();
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if (!d->ref.deref())
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delete d;
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d = x;
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}
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/*!
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This is a helper for the detach method of implicitly shared
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classes. Your private class needs a copy constructor which copies
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the members and sets the refcount to 1. After that, your detach
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function should look like this:
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\snippet code/src.corelib.thread.qatomic.h 1
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*/
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template <typename T>
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inline void qAtomicDetach(T *&d)
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{
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if (d->ref.load() == 1)
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return;
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T *x = d;
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d = new T(*d);
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if (!x->ref.deref())
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delete x;
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}
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QT_END_NAMESPACE
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#endif // QATOMIC_H
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