"Martin v. Löwis" martin at v.loewis.de
Fri Mar 24 08:47:18 CET 2006

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Neal Norwitz wrote:
> I played with this some last night and found the same ordering.  I
> have a different patch that also fixes the problem.  It also fixes 2-3
> bugs I think.  Basically the child could be waited on from outside
> popen (or from 2 threads).  The question is what should we do if that
> happens?

As discussed in the patch: If the application calls wait() at some 
point, or poll() (in the same thread or a different thread), then it
is correct if .wait() will raise an os.error (ECHILD) - the pid was
already waited on.

OTOH, _cleanup shouldn't mess with pids that the application still might 
want to wait on; _cleanup should also clean out objects that already
have been waited on. So my proposal is that Popen3 objects should be
added to _active only in __del__.

Regards,
Martin

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