CWorkerThread and IWorkerThreadClient not working in my ATL COM server code

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I am using CWorkerThread and IWorkerThreadClient in my ATL code but they do not seem to be working in conjunction with MsgWaitForMultipleObjectsEx. My code looks like:

// In the main thread:

HANDLE workerThreadHandle;
workerThread = new CWorkerThread<>;
workerThreadImpl = new ProcessThread;
ProcessingData * data = new ProcessingData;
// Code to initialize processing data ...
workerThread -> Initialize();
workerThread -> AddTimer(1,workerThreadImpl,reinterpret_cast<DWORD_PTR>(data),&workerThreadHandle);
while (true)
{

DWORD res(::MsgWaitForMultipleObjectsEx(1,&workerThreadHandle,INFINITE,QS_ALLINPUT,0));

if (res == WAIT_OBJECT_0)
{

// Thread has ended (1)

break;
}
else
{

MSG msg;

while (true)
{
if (::PeekMessage(&msg,0,0,0,PM_REMOVE))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
else
{
break;
}
}
}
}
// Further processing...

In the worker thread:

HRESULT ProcessThread::Execute(DWORD_PTR dwParam,HANDLE hObject)
{
CoInitializeEx(0,COINIT_APARTMENTTHREADED);

ProcessingData * data = reinterpret_cast<ProcessingData *>(dwParam);

// Lots of processing here ...

CoUninitialize();
return S_OK;
}

In the code above, the 'break' in the main 'while (true)' loop of my main thread, shown at (1), is occuring before the Execute of my worker thread is finished.

Am I missing something or is the worker thread not working like it should in ATL ?
.

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