[Bug nptl/22337] pthread_join incorrectly fails for a detached running thread

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22337

Carlos O'Donell <carlos at redhat dot com> changed:

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                 CC|                            |carlos at redhat dot com

--- Comment #8 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Andreas Schwab from comment #7)
> It says that pthread_detach has the same effect as PTHREAD_CREATE_DETACHED.

I agree with Andreas, it is the principle of least surprise. 

Once you call pthread_detach() it *should* behave as if you'd started the
thread with PTHREAD_CREATE_DETACHED.

This means pthread_join returns EINVAL (thread is not joinable) as soon as
pthread_detach finishes setting joinid to itself.

The other thing to consider is this: What happens if you call pthread_detach()
*while* another thread is already waiting? (this is mentioned in the comments
in pthread_detach).

I think the only bug is that a pthread_join *before* a pthread_detach should
result in pthread_detach returning EINVAL, but right now it looks like we
return 0 (just looking at the code, would need a test case for this).

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