BOOL AFXAPI AfxInternalPumpMessage()
{
    _AFX_THREAD_STATE *pState = AfxGetThreadState();

    if (!::GetMessage(&(pState->m_msgCur), NULL, NULL, NULL))  <-----
    {
#ifdef _DEBUG
        TRACE(traceAppMsg, 1, "CWinThread::PumpMessage - Received WM_QUIT.n");
            pState->m_nDisablePumpCount++; // application must die
#endif
        // Note: prevents calling message loop things in 'ExitInstance'
        // will never be decremented
        return FALSE;
    }

if (pThreadInfo->m_pActivity)
        {
            SetThreadPriority(pThreadInfo->m_hThread, THREAD_PRIORITY_NORMAL);
            pThreadInfo->m_pActivity->Execute();
            SetThreadPriority(pThreadInfo->m_hThread, THREAD_PRIORITY_BELOW_NORMAL);
            pThreadInfo->m_pActivity = NULL;
        }
        else
            Sleep(50);  <-----