hxmutex.cpp

来自「symbian 下的helix player源代码」· C++ 代码 · 共 119 行

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxmutex.cpp,v 1.2.20.1 2004/07/09 02:06:33 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
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 * will apply. You may also obtain the license terms directly from
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 * This file is part of the Helix DNA Technology. RealNetworks is the
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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;
}