Re: AfxBeginThread question

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 8 Jan 2008 09:46:37 -0500

Message-ID:

<udLSMVgUIHA.5980@TK2MSFTNGP04.phx.gbl>

"Zapanaz" <http://joecosby.com/code/mail.pl> wrote in message
news:qu6dnXo_YpATgR7anZ2dnUVZ_gWdnZ2d@zhonka.net...

I have an application where I use AfxBeginThread() to create a worker
thread to do some heavy work. Within the thread function, I use
PostMessage() to pass messages back to the application.

I am wondering what happens if the user closes the application while
the thread is still working. I assumed I would want to kill the
thread during program shutdown/cleanup, but off hand I don't see a way
to do that.

It is important to control the shutdown sequence yourself, to make sure the
thread does not try to access things that have been destroyed by the main
thread.

Thread shutdown is typically managed in your WM_CLOSE message handler. You
notify the thread to close there, then you make the main thread wait until
the thread has exited. This "waiting" could be done with a
WaitForSingleObject call, or it could be done by returning from WM_CLOSE
without doing anything, and continuing the close process upon receipt of a
final message from the worker thread.

--
Scott McPhillips [VC++ MVP]