linux-kernel - Re: And now for something _totally

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Message-ID: <Pine.LNX.4.64.0706171436260.20841@alien.or.mcafeemobile.com>
Date:	Sun, 17 Jun 2007 16:49:40 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Nicholas Miell <nmiell@...cast.net>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: And now for something _totally_ different: Linux v2.6.22-rc5

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


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