[Bug libc/30558] SIGEV_THREAD is badly implemented

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30558

--- Comment #23 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Stas Sergeev from comment #21)
> Ok so this means your current patch
> needs to be applied, which is fine with
> me no matter what posix says or not says.
> So when would it be applied then?

I need to correctly handle pthread_exit on callback and think better how to
handle pthread_cancel (since it requires not now mask the signal).  musl reset
the thread state in this case (run dtor, reset tls, reinit internal state), so
I am considering do the same. It avoid the caller to miss any timer due failing
in thread creation.

> Also please consider adding a check,
> either a macro or a runtime check, so
> that I can select between your impl
> and timerfd one (as old impl is completely
> broken and should never be selected)

I do not plan to provide multiple implementations nor implement on top of
timerfd (as I put on comment #7).

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