linux-kernel - Re: [RESEND][RFC PATCH v2] waitfd

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Message-Id: <1231613164.11642.108.camel@quest>
Date:	Sat, 10 Jan 2009 18:46:04 +0000
From:	Scott James Remnant <scott@...onical.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Casey Dahlin <cdahlin@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Ulrich Drepper <drepper@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RESEND][RFC PATCH v2] waitfd

On Sat, 2009-01-10 at 19:21 +0100, Oleg Nesterov wrote:

> On 01/10, Scott James Remnant wrote:
> >
> > On Sat, 2009-01-10 at 17:19 +0100, Oleg Nesterov wrote:
> >
> > > I am not sure we are talking about the same thing, but afaics poll() +
> > > signalfd can work to (say) reap the childs. Actually, ppoll() alone is
> > > enough.
> > >
> > Last time I checked, ppoll() was not actually implemented across all
> > architectures in a manner that solved the race it was intended to solve.
> >
> 
> As I said, this is imho unfair. But I mentioned ppol() "just in case".
> 
> My questiong was why do you think that "signalfd() can't currently be
> made to work in the way you describe". You have dropped this part to
> change the topic?
> 
Sorry, I may not be following LKML etiquette correctly.  These couple of
recent threads (other than some bugs I found in wait last year) are my
first real attempt to participate here.

I wasn't intending to "change the topic" or dropping the parts about
changing signalfd() to somehow sweet it under the carpet.

Rather than posting repeatedly across the thread, I tried to consolidate
my responses into the other post you've replied to.


You made an interesting point about ppoll here, so I only responded to
that to find out whether the situation of that syscall had been
improved.

Not so much changing the topic, but asking a side-bar question ;)

Scott
-- 
Scott James Remnant
scott@...onical.com

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