[issue19021] AttributeError in Popen.__del__
Richard Oudkerk
report at bugs.python.org
Thu Oct 3 16:15:20 CEST 2013
Richard Oudkerk added the comment:
> Well, perhaps we can special-case builtins not to be "wiped" at shutdown.
> However, there is another problem here in that the Popen object survives
> until the builtins module is wiped. This should be investigated too.
Maybe it is because it uses the evil resuscitate-in-__del__ trick. I
presume that if the child process survives during shutdown, then the popen
object is guaranteed to survive too.
We could get rid of the trick:
* On Windows __del__ is unneeded since we don't need to reap zombie
processes.
* On Unix __del__ could just add self._pid (rather than self) to the list
_active. _cleanup() would then use os.waitpid() to check the pids in
_active.
The hardest thing about making such a change is that test_subprocess
currently uses _active.
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