/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** GNU Lesser General Public License Usage
** 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.
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** rights. These rights are described in the Nokia 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:
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** Alternatively, this file may be used in accordance with the terms and
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** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QOLDBASICATOMIC_H
#define QOLDBASICATOMIC_H

#include <QtCore/qglobal.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE


#if 0
#pragma qt_no_master_include
#pragma qt_sync_stop_processing
#endif

class Q_CORE_EXPORT QBasicAtomicInt
{
public:
#ifdef QT_ARCH_PARISC
    int _q_lock[4];
#endif
#if defined(QT_ARCH_WINDOWS) || defined(QT_ARCH_WINDOWSCE)
    union { // needed for Q_BASIC_ATOMIC_INITIALIZER
        volatile long _q_value;
    };
#else
    volatile int _q_value;
#endif

    // Atomic API, implemented in qatomic_XXX.h

    int load() const { return _q_value; }
    int loadAcquire() { return _q_value; }
    void store(int newValue) { _q_value = newValue; }
    void storeRelease(int newValue) { _q_value = newValue; }

    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);
};

template <typename T>
class QBasicAtomicPointer
{
public:
#ifdef QT_ARCH_PARISC
    int _q_lock[4];
#endif
#if defined(QT_ARCH_WINDOWS) || defined(QT_ARCH_WINDOWSCE)
    union {
        T * volatile _q_value;
#  if !defined(Q_OS_WINCE) && !defined(__i386__) && !defined(_M_IX86)
        qint64
#  else
        long
#  endif
        volatile _q_value_integral;
    };
#else
    T * volatile _q_value;
#endif

    // Atomic API, implemented in qatomic_XXX.h

    T *load() const { return _q_value; }
    T *loadAcquire() { return _q_value; }
    void store(T *newValue) { _q_value = newValue; }
    void storeRelease(T *newValue) { _q_value = newValue; }

    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);
};

#ifdef QT_ARCH_PARISC
#  define Q_BASIC_ATOMIC_INITIALIZER(a) {{-1,-1,-1,-1},(a)}
#elif defined(QT_ARCH_WINDOWS) || defined(QT_ARCH_WINDOWSCE)
#  define Q_BASIC_ATOMIC_INITIALIZER(a) { {(a)} }
#else
#  define Q_BASIC_ATOMIC_INITIALIZER(a) { (a) }
#endif

QT_END_NAMESPACE
QT_END_HEADER

#  include <QtCore/qatomic_arch.h>

#endif // QBASIC_ATOMIC