/****************************************************************************
**
** Copyright (C) 2011 Thiago Macieira <thiago@kde.org>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** following information to ensure the GNU Lesser General Public License
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****************************************************************************/

#ifndef QATOMIC_CXX11_H
#define QATOMIC_CXX11_H

#include <QtCore/qgenericatomic.h>
#include <atomic>

QT_BEGIN_NAMESPACE

#if 0
// silence syncqt warnings
QT_END_NAMESPACE
#pragma qt_sync_skip_header_check
#pragma qt_sync_stop_processing
#endif

#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT_TEST_AND_SET_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_SOMETIMES_NATIVE

#define Q_ATOMIC_INT32_IS_SUPPORTED
#define Q_ATOMIC_INT32_REFERENCE_COUNTING_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT32_TEST_AND_SET_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT32_FETCH_AND_STORE_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_INT32_FETCH_AND_ADD_IS_SOMETIMES_NATIVE

#define Q_ATOMIC_POINTER_REFERENCE_COUNTING_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_SOMETIMES_NATIVE
#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_SOMETIMES_NATIVE

template<> struct QAtomicOpsSupport<1> { enum { IsSupported = 1 }; };
template<> struct QAtomicOpsSupport<2> { enum { IsSupported = 1 }; };
template<> struct QAtomicOpsSupport<8> { enum { IsSupported = 1 }; };

#define Q_ATOMIC_INT8_IS_SUPPORTED
#define Q_ATOMIC_INT8_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT8_TEST_AND_SET_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT8_FETCH_AND_STORE_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT8_FETCH_AND_ADD_IS_ALWAYS_NATIVE

#define Q_ATOMIC_INT16_IS_SUPPORTED
#define Q_ATOMIC_INT16_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT16_TEST_AND_SET_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT16_FETCH_AND_STORE_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT16_FETCH_AND_ADD_IS_ALWAYS_NATIVE

#define Q_ATOMIC_INT64_IS_SUPPORTED
#define Q_ATOMIC_INT64_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT64_TEST_AND_SET_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT64_FETCH_AND_STORE_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT64_FETCH_AND_ADD_IS_ALWAYS_NATIVE

template <typename X> struct QAtomicOps
{
    typedef std::atomic<X> Type;

    template <typename T> static inline
    T load(const std::atomic<T> &_q_value) Q_DECL_NOTHROW
    {
        return _q_value.load(std::memory_order_relaxed);
    }

    template <typename T> static inline
    T load(const volatile std::atomic<T> &_q_value) Q_DECL_NOTHROW
    {
        return _q_value.load(std::memory_order_relaxed);
    }

    template <typename T> static inline
    T loadAcquire(const std::atomic<T> &_q_value) Q_DECL_NOTHROW
    {
        return _q_value.load(std::memory_order_acquire);
    }

    template <typename T> static inline
    T loadAcquire(const volatile std::atomic<T> &_q_value) Q_DECL_NOTHROW
    {
        return _q_value.load(std::memory_order_acquire);
    }

    template <typename T> static inline
    void store(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        _q_value.store(newValue, std::memory_order_relaxed);
    }

    template <typename T> static inline
    void storeRelease(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        _q_value.store(newValue, std::memory_order_release);
    }

    static inline Q_DECL_CONSTEXPR bool isReferenceCountingNative() Q_DECL_NOTHROW { return true; }
    static inline Q_DECL_CONSTEXPR bool isReferenceCountingWaitFree() Q_DECL_NOTHROW { return false; }
    template <typename T>
    static inline bool ref(std::atomic<T> &_q_value)
    {
        return ++_q_value != 0;
    }

    template <typename T>
    static inline bool deref(std::atomic<T> &_q_value) Q_DECL_NOTHROW
    {
        return --_q_value != 0;
    }

    static inline Q_DECL_CONSTEXPR bool isTestAndSetNative() Q_DECL_NOTHROW { return false; }
    static inline Q_DECL_CONSTEXPR bool isTestAndSetWaitFree() Q_DECL_NOTHROW { return false; }

    template <typename T>
    static bool testAndSetRelaxed(std::atomic<T> &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW
    {
        bool tmp = _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_relaxed);
        if (currentValue)
            *currentValue = expectedValue;
        return tmp;
    }

    template <typename T>
    static bool testAndSetAcquire(std::atomic<T> &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW
    {
        bool tmp = _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_acquire);
        if (currentValue)
            *currentValue = expectedValue;
        return tmp;
    }

    template <typename T>
    static bool testAndSetRelease(std::atomic<T> &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW
    {
        bool tmp = _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_release);
        if (currentValue)
            *currentValue = expectedValue;
        return tmp;
    }

    template <typename T>
    static bool testAndSetOrdered(std::atomic<T> &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW
    {
        bool tmp = _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_acq_rel);
        if (currentValue)
            *currentValue = expectedValue;
        return tmp;
    }

    static inline Q_DECL_CONSTEXPR bool isFetchAndStoreNative() Q_DECL_NOTHROW { return false; }
    static inline Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree() Q_DECL_NOTHROW { return false; }

    template <typename T>
    static T fetchAndStoreRelaxed(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        return _q_value.exchange(newValue, std::memory_order_relaxed);
    }

    template <typename T>
    static T fetchAndStoreAcquire(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        return _q_value.exchange(newValue, std::memory_order_acquire);
    }

    template <typename T>
    static T fetchAndStoreRelease(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        return _q_value.exchange(newValue, std::memory_order_release);
    }

    template <typename T>
    static T fetchAndStoreOrdered(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
    {
        return _q_value.exchange(newValue, std::memory_order_acq_rel);
    }

    static inline Q_DECL_CONSTEXPR bool isFetchAndAddNative() Q_DECL_NOTHROW { return false; }
    static inline Q_DECL_CONSTEXPR bool isFetchAndAddWaitFree() Q_DECL_NOTHROW { return false; }

    template <typename T> static inline
    T fetchAndAddRelaxed(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
    {
        return _q_value.fetch_add(valueToAdd, std::memory_order_relaxed);
    }

    template <typename T> static inline
    T fetchAndAddAcquire(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
    {
        return _q_value.fetch_add(valueToAdd, std::memory_order_acquire);
    }

    template <typename T> static inline
    T fetchAndAddRelease(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
    {
        return _q_value.fetch_add(valueToAdd, std::memory_order_release);
    }

    template <typename T> static inline
    T fetchAndAddOrdered(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
    {
        return _q_value.fetch_add(valueToAdd, std::memory_order_acq_rel);
    }
};

#ifdef ATOMIC_VAR_INIT
# define Q_BASIC_ATOMIC_INITIALIZER(a)   { ATOMIC_VAR_INIT(a) }
#else
# define Q_BASIC_ATOMIC_INITIALIZER(a)   { {a} }
#endif

QT_END_NAMESPACE

#endif // QATOMIC_CXX0X_H