Re: [patch] Re: Problem with exiting threads under NPTL

[Roland McGrath]

> Or is that case impossible to trigger? Looks a bit like that. But if it
> _is_ impossible to trigger (ie exit_signal cannot be -1 for a thread
> leader), then why does the current code test for "&& leader->exit_signal
> != -1)" at all?

I think that most of the logic testing exit_signal was written when
CLONE_DETACHED could be used independent of CLONE_THREAD.  We concluded
that was unworkable due to some related races and changed clone so that the
situation of a (live) thread group leader with exit_signal == -1 is now
impossible.
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