linux-kernel - Re: [patch 1/4] signalfd v1

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Message-ID: <Pine.LNX.4.64.0703071419160.4893@alien.or.mcafeemobile.com>
Date:	Wed, 7 Mar 2007 14:21:56 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/4] signalfd v1 - signalfd core ...

On Wed, 7 Mar 2007, Jeremy Fitzhardinge wrote:

> Davide Libenzi wrote:
> > You have the *choice* to do that:
> >
> > 1) You want standard delivery only:
> >
> >    - Just dont use signalfd
> >
> > 2) you want signalfd only:
> >
> >    - Do a sigprocmask(SIG_BLOCK) of the same mask you pass to signalfd
> >
> > If you want both, you can have it. Race free.
> >   
> 
> It's only usefully race-free if you are guarantee that each signal gets
> delivered once, by one path or the other.  Otherwise you get a
> non-deterministic number of each signal actually delivered - what
> earthly use is that to an application?

As I mentioned above, you do have the option to do that. With basically 
the same kernel-side code. I mean, I could add a flag to signalfd and do 
the blocking inside there, but that's just pushing stuff into the call.



- Davide


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