I have multithreaded application with several UI thread and several worker threads. The application fails to exit when Windows NT session is exiting. I check WM_QUERYENDSESSION and WM_ENDSESSION are sent to all top-level windows and return values are correct. NT waits for the application to exit and then displays dialog box "application is not responding". Everything works fine and the application successfully exits when running on Windows 9x. Also normally it exits well on either platform. Unfortunately, I cannot set breakpoint in WM_QUERYENDSESSION and WM_ENDSESSION messages handlers when Windows is exiting.
Does anyone have any idea?