Re: And now for something _totally_ different: Linux v2.6.22-rc5

Davide Libenzi
2007-06-17T23:49:56Z

On Sun, 17 Jun 2007, Nicholas Miell wrote:

> On Sun, 2007-06-17 at 10:01 -0700, Davide Libenzi wrote:
> > On Sun, 17 Jun 2007, Nicholas Miell wrote:
> >
> > > On Sat, 2007-06-16 at 20:33 -0700, Linus Torvalds wrote:
> > > > In a stunning turn of events, I've actually been able to make another -rc
> > > > release despite all the discussion (*cough*flaming*cough*) about other
> > > > issues, and we now have a brand-spanking-new Linux 2.6.22-rc5 release
> > > > out there!
> > > >
> > >
> > > signalfd still has the broken behavior w.r.t. signal delivery to
> > > threads.
> > >
> > > Is this going to get fixed before 2.6.22 proper is released, or should
> > > it just be disabled entirely so no userspace apps grow to depend on
> > > current wrong behavior?
> >
> > At the moment, with Ben's patch applied, signalfd can see all group-sent
> > signals, and locally-directed thread signals.
>
> But there's still no way for multiple threads to read from a single
> signalfd and get their own thread-specific signals in addition to
> process-wide signals, right? I think this was agreed to be the least
> surprising behavior.

Multiple threads can wait on the signalfd. Each one will dequeue either
its own private signals (tsk->pending) or the process shared ones
(tsk->signal->shared_pending). This will be the behaviour once Ben's patch
is applied.

- Davide