thread_defs2.cpp

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

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) 2012-2014 Intel Corporation. All Rights Reserved.

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

#include <new> // std::bad_alloc

#include "thread_defs.h"

AutomaticMutex::AutomaticMutex(MSDKMutex& mutex):
    m_rMutex(mutex),
    m_bLocked(false)
{
    if (MFX_ERR_NONE != Lock()) throw std::bad_alloc();
};
AutomaticMutex::~AutomaticMutex(void)
{
    Unlock();
}

mfxStatus AutomaticMutex::Lock(void)
{
    mfxStatus sts = MFX_ERR_NONE;
    if (!m_bLocked)
    {
        if (!m_rMutex.Try())
        {
            // add time measurement here to estimate how long you sleep on mutex...
            sts = m_rMutex.Lock();
        }
        m_bLocked = true;
    }
    return sts;
}

mfxStatus AutomaticMutex::Unlock(void)
{
    mfxStatus sts = MFX_ERR_NONE;
    if (m_bLocked)
    {
        sts = m_rMutex.Unlock();
        m_bLocked = false;
    }
    return sts;
}