Re: Valid CWinThread handles

"Doug Harrison [MVP]" <>
Thu, 30 Oct 2008 12:03:43 -0500
On Thu, 30 Oct 2008 02:11:34 -0700 (PDT), Newsgroupie <>

Hello fellow newsgroupies!

Is there a way to find out whether or not a CWinThread process has
stopped or not or is still valid.

I have several CWinThread's (none of which are set to auto-delete)

Those two questions are at odds with one another. The problem is the
auto-delete, and you've described a race condition. You can't tell if the
CWinThread is alive without touching the CWinThread, which may already have
been auto-deleted or in the process of it.

which may occasionally finish their processes before I signal them to
stop. I sometimes need to reuse these CWinThread's and restart their
processes but I need to know that they are no longer running first.

I'd just create new ones or use a thread pool.

They may already have their stop CEvent set but the thread may have
already acted on it and stopped.

Their m_hThread values will not be NULL but no longer handles to valid

Yes, because the CWinThread's have auto-deleted themselves, so nothing they
contain is valid. The solution is to turn off auto-delete. It is rarely if
ever appropriate to allow auto-delete.

Any suggestions gratefully received.

Please read my FAQ page:

Doug Harrison
Visual C++ MVP

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