linux-kernel - Re: [RFC][PATCH 0/5] Signal scalability series

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Date:	Tue, 4 Oct 2011 19:29:38 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC][PATCH 0/5] Signal scalability series

On 10/04, Matt Fleming wrote:
>
> Ah, I think it was these lines that confused me into thinking
> ->ctrl_lock wasn't required around PF_EXITING,
>
> void exit_signals(struct task_struct *tsk)
> {
>         int group_stop = 0;
>         sigset_t unblocked;
>
>         if (thread_group_empty(tsk) || signal_group_exit(tsk->signal)) {
>                 tsk->flags |= PF_EXITING;
>                 return;
>         }
>
> But I guess that's safe because either we're the only thread in the
> group or the group is already going to exit?

Yes. Except s/exit/exit or exec/.

And this reminds me... This is not exactly right. I do not mean
this particular function, but the whole logic. An execing process
can miss SIGSTOP. Or the coredumping signal.

Oleg.

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