linux-kernel - Re: [RFC + PATCH] signalfd simplification

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Date:	Sun, 2 Sep 2007 17:02:34 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk-manpages@....net>
Subject: Re: [RFC + PATCH] signalfd simplification

On 09/02, Oleg Nesterov wrote:
>
> Small problem: unless I missed something, signalfd_deliver() and sys_signalfd()
> should use wake_up_all(), not wake_up() which implies nr_exclusive == 1.
> 
> It is possible that we have multiple threads waiting on ->signalfd_wqh with
> the the different ->sigmask. In this case, the first woken thread can ignore
> the signal, we should wake up all of them.

Oops, sorry for noise. I forgot about WQ_FLAG_EXCLUSIVE, we don't set it by
default.

Oleg.

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