umc_automatic_mutex.h

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/*
//
//              INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license  agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in  accordance  with the terms of that agreement.
//    Copyright (c) 2003-2005 Intel Corporation. All Rights Reserved.
//
//
*/

#ifndef __UMC_AUTOMATIC_MUTEX_H
#define __UMC_AUTOMATIC_MUTEX_H

#include "vm_mutex.h"

namespace UMC
{

class AutomaticMutex
{
public:
    // Constructor
    AutomaticMutex(vm_mutex &mutex);
    // Destructor
    ~AutomaticMutex(void);

    // lock mutex again
    void Lock(void);
    // Unlock mutex
    void Unlock(void);

protected:
    vm_mutex *m_lpMutex;                                        // (vm_mutex *) pointer to using mutex
    bool m_bLocked;                                             // (bool) mutex is own locked
};

inline
AutomaticMutex::AutomaticMutex(vm_mutex &mutex)
{
    if (vm_mutex_is_valid(&mutex))
    {
        m_lpMutex = &mutex;

        // lock mutex
        vm_mutex_lock(m_lpMutex);
        m_bLocked = true;
    }
    else
    {
        m_lpMutex = NULL;
        m_bLocked = false;
    }

} // AutomaticMutex::AutomaticMutex(vm_mutex &mutex)

inline
AutomaticMutex::~AutomaticMutex(void)
{
    Unlock();

} // AutomaticMutex::~AutomaticMutex(void)

inline
void AutomaticMutex::Lock(void)
{
    if (m_lpMutex)
    {
        if ((vm_mutex_is_valid(m_lpMutex)) && (false == m_bLocked))
        {
            vm_mutex_lock(m_lpMutex);
            m_bLocked = true;
        }

    }

} // void AutomaticMutex::Unlock(void)

inline
void AutomaticMutex::Unlock(void)
{
    if (m_lpMutex)
    {
        if ((vm_mutex_is_valid(m_lpMutex)) && (m_bLocked))
        {
            vm_mutex_unlock(m_lpMutex);
            m_bLocked = false;
        }

    }

} // void AutomaticMutex::Unlock(void)

} // end namespace UMC

#endif // __UMC_AUTOMATIC_MUTEX_H