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// Copyright (C) 2017 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QATOMIC_H
#define QATOMIC_H
#include <QtCore/qbasicatomic.h>
QT_BEGIN_NAMESPACE
QT_WARNING_PUSH
QT_WARNING_DISABLE_GCC("-Wextra")
// High-level atomic integer operations
template <typename T>
class QAtomicInteger : public QBasicAtomicInteger<T>
{
public:
// Non-atomic API
constexpr QAtomicInteger(T value = 0) noexcept : QBasicAtomicInteger<T>(value) {}
inline QAtomicInteger(const QAtomicInteger &other) noexcept
: QBasicAtomicInteger<T>()
{
this->storeRelease(other.loadAcquire());
}
inline QAtomicInteger &operator=(const QAtomicInteger &other) noexcept
{
this->storeRelease(other.loadAcquire());
return *this;
}
#ifdef Q_QDOC
T loadRelaxed() const;
T loadAcquire() const;
void storeRelaxed(T newValue);
void storeRelease(T newValue);
operator T() const;
QAtomicInteger &operator=(T);
static constexpr bool isReferenceCountingNative();
static constexpr bool isReferenceCountingWaitFree();
bool ref();
bool deref();
static constexpr bool isTestAndSetNative();
static 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);
bool testAndSetRelaxed(T expectedValue, T newValue, T ¤tValue);
bool testAndSetAcquire(T expectedValue, T newValue, T ¤tValue);
bool testAndSetRelease(T expectedValue, T newValue, T ¤tValue);
bool testAndSetOrdered(T expectedValue, T newValue, T ¤tValue);
static constexpr bool isFetchAndStoreNative();
static constexpr bool isFetchAndStoreWaitFree();
T fetchAndStoreRelaxed(T newValue);
T fetchAndStoreAcquire(T newValue);
T fetchAndStoreRelease(T newValue);
T fetchAndStoreOrdered(T newValue);
static constexpr bool isFetchAndAddNative();
static constexpr bool isFetchAndAddWaitFree();
T fetchAndAddRelaxed(T valueToAdd);
T fetchAndAddAcquire(T valueToAdd);
T fetchAndAddRelease(T valueToAdd);
T fetchAndAddOrdered(T valueToAdd);
T fetchAndSubRelaxed(T valueToSub);
T fetchAndSubAcquire(T valueToSub);
T fetchAndSubRelease(T valueToSub);
T fetchAndSubOrdered(T valueToSub);
T fetchAndOrRelaxed(T valueToOr);
T fetchAndOrAcquire(T valueToOr);
T fetchAndOrRelease(T valueToOr);
T fetchAndOrOrdered(T valueToOr);
T fetchAndAndRelaxed(T valueToAnd);
T fetchAndAndAcquire(T valueToAnd);
T fetchAndAndRelease(T valueToAnd);
T fetchAndAndOrdered(T valueToAnd);
T fetchAndXorRelaxed(T valueToXor);
T fetchAndXorAcquire(T valueToXor);
T fetchAndXorRelease(T valueToXor);
T fetchAndXorOrdered(T valueToXor);
T operator++();
T operator++(int);
T operator--();
T operator--(int);
T operator+=(T value);
T operator-=(T value);
T operator|=(T value);
T operator&=(T value);
T operator^=(T value);
#endif
};
class QAtomicInt : public QAtomicInteger<int>
{
public:
// Non-atomic API
// We could use QT_COMPILER_INHERITING_CONSTRUCTORS, but we need only one;
// the implicit definition for all the others is fine.
constexpr QAtomicInt(int value = 0) noexcept : QAtomicInteger<int>(value) {}
};
// High-level atomic pointer operations
template <typename T>
class QAtomicPointer : public QBasicAtomicPointer<T>
{
public:
constexpr QAtomicPointer(T *value = nullptr) noexcept : QBasicAtomicPointer<T>(value) {}
inline QAtomicPointer(const QAtomicPointer<T> &other) noexcept
: QBasicAtomicPointer<T>()
{
this->storeRelease(other.loadAcquire());
}
inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other) noexcept
{
this->storeRelease(other.loadAcquire());
return *this;
}
#ifdef Q_QDOC
T *loadAcquire() const;
T *loadRelaxed() const;
void storeRelaxed(T *newValue);
void storeRelease(T *newValue);
static constexpr bool isTestAndSetNative();
static 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 constexpr bool isFetchAndStoreNative();
static constexpr bool isFetchAndStoreWaitFree();
T *fetchAndStoreRelaxed(T *newValue);
T *fetchAndStoreAcquire(T *newValue);
T *fetchAndStoreRelease(T *newValue);
T *fetchAndStoreOrdered(T *newValue);
static constexpr bool isFetchAndAddNative();
static constexpr bool isFetchAndAddWaitFree();
T *fetchAndAddRelaxed(qptrdiff valueToAdd);
T *fetchAndAddAcquire(qptrdiff valueToAdd);
T *fetchAndAddRelease(qptrdiff valueToAdd);
T *fetchAndAddOrdered(qptrdiff valueToAdd);
#endif
};
QT_WARNING_POP
/*!
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.loadRelaxed() == 1)
return;
T *x = d;
d = new T(*d);
if (!x->ref.deref())
delete x;
}
QT_END_NAMESPACE
#endif // QATOMIC_H
|
