linux-kernel - Re: waitpid(WNOHANG) should report SIGCHLD-notified signals [Re: [PATCH 09/11] job control: reorganize wait_task

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Message-ID: <20110516123930.GA11933@host1.jankratochvil.net>
Date:	Mon, 16 May 2011 14:39:30 +0200
From:	Jan Kratochvil <jan.kratochvil@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, vda.linux@...glemail.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu
Subject: Re: waitpid(WNOHANG) should report SIGCHLD-notified signals  [Re:
 [PATCH 09/11] job control: reorganize wait_task_stopped()]

Hi Tejun,

On Mon, 16 May 2011 14:27:56 +0200, Tejun Heo wrote:
> On Mon, May 16, 2011 at 02:11:16PM +0200, Jan Kratochvil wrote:
> > It cannot as various GDB-supported platforms do not support threads properly.
> > And you want to have a common codebase to get it will supported.
> > 
> > Besides that it is a matter of coding style, I perfer "poll() model" even on
> > threads-supporting GNU/Linux.
> 
> The above wouldn't be linux kernel's top design concerns, right?

They are - as without threads one needs reliable WNOHANG - while which you say
it is not reliable.


> It's not like new interface is gonna break that, but I think it's gonna be
> more fragile.  Well, it shouldn't be worse than now.

BTW I really do not think this WNOHANG issue is anyhow related to this whole
discussion.


Thanks,
Jan
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