/****************************************************************************

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the QtCore module of the Qt Toolkit.

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****************************************************************************/

#ifndef QMUTEX_P_H

#define QMUTEX_P_H

#include "qglobal.h"

#if defined(_OS_UNIX_) || defined(_OS_MAC_)

#include <pthread.h>

#elif defined(_OS_WIN32_)

#include <windows.h>

#endif

class QAtomicInt

{

  public:

    QAtomicInt(int v=0) : m_value(v) {}

    bool testAndSet(int expectedValue,int newValue);

    int  fetchAndAdd(int valueToAdd);

    operator int () const { return m_value; }

    bool operator==(int value) const { return m_value == value; }

    bool operator!=(int value) const { return m_value != value; }

    bool operator!() const { return m_value == 0; }

  private:

    volatile int m_value;

};

class QMutexPrivate

{

public:

    QMutexPrivate();

    ~QMutexPrivate();

    void wait();

    void wakeUp();

    QAtomicInt contenders;

#if defined(_OS_UNIX_) || defined(_OS_MAC_)

    volatile bool wakeup;

    pthread_mutex_t mutex;

    pthread_cond_t cond;

#elif defined(_OS_WIN32_)

    HANDLE event;

#else

#error "unsupported platform"

#endif

};

#endif // QMUTEX_P_H