CoMarshalInterThreadInterfaceInStream FinalRelease not called

=?Utf-8?B?UGhpbCBSaWVyYQ==?= <Phil>
Tue, 21 Aug 2007 11:24:04 -0700
I've created an object that marshals an interface with
CoMarshalInterThreadInterfaceInStream/CoGetInterfaceAndReleaseStream. The
interface pointer is working as intended but my FinalRelease is not being
called. Here is a sample of what I am doing.

unsigned __stdcall CEngineObj::AnalysisThreadProc( void* args )
    CEngineObj* engine = static_cast<CEngineObj*>(args);
    DWORD dwResult;
    HRESULT hr = S_OK;

    // unmarshal interface pointer
    IInternalEngineCallback* pCallback;
    hr = CoGetInterfaceAndReleaseStream (*(engine->m_ppStream),
        (void**) &pCallback);
    delete engine->m_ppStream;
    engine->m_ppStream = NULL;

        dwResult = WaitForMultipleObjects( engine->NUM_EVENTS, engine->m_hEvents,
        switch( dwResult )
        case WAIT_OBJECT_0 + EVTEXIT:
            return 0;

    return 0;

HRESULT CEngineObj::FinalConstruct()
    HRESULT hr = S_OK;

    // Marshal interface pointer
    m_ppStream = new IStream*;
    hr = ::CoMarshalInterThreadInterfaceInStream(IID_IInternalEngineCallback,
    reinterpret_cast<IInternalEngineCallback*>(this), m_ppStream);
    if (FAILED (hr)) {
        delete m_ppStream;
        m_ppStream = NULL;
        return hr;

    // Create the thread
    unsigned threadID;
    m_hAnalysisThread = (HANDLE)_beginthreadex( NULL, 0, &AnalysisThreadProc,
this, 0, &threadID );
    if( 0 == m_hAnalysisThread )
        return E_FAIL;

    return hr;

void CEngineObj::FinalRelease()
    if( m_hAnalysisThread && m_hEvents[EVTEXIT] )
        WaitForSingleObject( m_hAnalysisThread, INFINITE );

Any help would be greatly appreciated.

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