Re: rthreads patch #7: redirect kill(getpid(), sig) to the current thread

On 5/4/08, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
> > Date: Sat, 3 May 2008 20:02:10 -0600
> > From: Philip Guenther <guenther@gmail.com>
>
> >
> > Redirect kill(getpid(), sig) to the current thread. Make
> > pthread_suspend_np(main_thread) work.
>
>
> I think this isn't quite right. POSIX says for kill(2) that:
>
> "If the value of pid causes sig to be generated for the sending
> process, and if sig is not blocked for the calling thread and if no
> other thread has sig unblocked or is waiting in a sigwait()
> function for sig, either sig or at least one pending unblocked
> signal shall be delivered to the sending thread before kill()
> returns."
>
> I think this needs changes in the kernel, and the kill function
> introduced will make it more difficult to do this properly.

afaik, this is already the current behavior. sig is only guaranteed
to be delivered to the current thread if no other thread has it
unblocked. That's what happens today. Is that correct?