Re: Worker thread ending

"Alexander Grigoriev" <>
Sun, 20 Jan 2008 09:49:25 -0800
If you use MFC, the only proper way to create a thread is to call
AfxBeginThread and create is SUSPENDED, set bAutoDelete to FALSE, and then
call ResumeThread(). This way, the CThread object (and the thread handle in
it) will stay valid after the thread is gone. You'll need to delete it by
yourself. Setting bAutoDelete to TRUE by default was a braindead decision in
the CTread class design.

Another braindead function is _beginthread(). It closes the handle
automatically upon exit. You should use _beginthreadex, if you write plain
C/C++ code (not using MFC).

"Newsgroupie" <> wrote in message


I create a worker thread(s) which will usually run until I tell it to
stop, which I do by signalling a CEvent object which the thread will
see and drop out of the thread function.

However, sometimes the thread my drop out early because it has
completed its tasks or an error has occurred.

When I create this thread I retain a copy of its handle so that after
I have set the stop event I can pass the handle to
WaitForMultipleObject (along with several other thread handles) and
wait for the thread to complete (as it may spend some time tidying a
few things up between it being told to stop and it actually

But when the thread finishes prematurely the handle is no longer valid
and so WaitForMultipleObject fails with a GetLastError of 6 (invalid

I always have the thread set to auto delete. The stop CEvent is not
deleted with the thread.

Can someone please suggest a better way for me to do this sort of
thing so that I can cleanly and safely detect that a running thread
has stopped and that previously running threads have also stopped.

I suppose what I really need to find out is if a thread handle is
still valid?

Many thanks in advance,


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