linux-kernel - Re: And now for something _totally

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Date:	Sun, 17 Jun 2007 17:08:23 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Davide Libenzi <davidel@...ilserver.org>
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, 2007-06-17 at 16:49 -0700, Davide Libenzi wrote:
> 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.
> 

Ah, ok, that's great.

I didn't see anything like that in linux.git, missed Ben's patch to the
list, and mixed up your description with the original TIF_SIGPENDING
work.

Sorry for the confusion.

-- 
Nicholas Miell <nmiell@...cast.net>

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