hxmutex.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
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 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
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 * ***** END LICENSE BLOCK ***** */ 

#include "hxmutex.h"

CHXMutex::CHXMutex()
 :  m_lRefCount(0)
 ,  m_pMutex(NULL)
{
#if defined(THREADS_SUPPORTED) || defined(_UNIX_THREADS_SUPPORTED)
    HXMutex::MakeMutex(m_pMutex);
#else
    HXMutex::MakeStubMutex(m_pMutex);
#endif

}

CHXMutex::~CHXMutex()
{
    HX_DELETE(m_pMutex);
}

STDMETHODIMP CHXMutex::Lock()
{
    if (m_pMutex)
        return m_pMutex->Lock();
    else
        return HXR_FAIL;
}

STDMETHODIMP CHXMutex::TryLock()
{
    if (m_pMutex)
        return m_pMutex->Trylock();
    else
        return HXR_FAIL;
}

STDMETHODIMP CHXMutex::Unlock()
{
    if (m_pMutex)
        return m_pMutex->Unlock();
    else
        return HXR_FAIL;
}

STDMETHODIMP CHXMutex::QueryInterface(REFIID riid, void** ppvObj)
{
    QInterfaceList qiList[] =
        {
            { GET_IIDHANDLE(IID_IHXMutex), (IHXMutex*)this },
            { GET_IIDHANDLE(IID_IUnknown), (IUnknown*)(IHXMutex*)this },
        };
    
    return ::QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);
}

ULONG32 CHXMutex::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

ULONG32 CHXMutex::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}