linux-kernel - Re: [PATCH] rfc: threaded epoll

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Message-ID: <463FB327.4070906@haxent.com.br>
Date:	Mon, 07 May 2007 20:15:51 -0300
From:	Davi Arnaut <davi@...ent.com.br>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rfc: threaded epoll_wait thundering herd

Ulrich Drepper wrote:
> On 5/7/07, Davi Arnaut <davi@...ent.com.br> wrote:
>> See Linus's message on this same thread.
> 
> No.  I'm talking about the userlevel side, not kernel side.

So you probably knew the answer before asking the question.

> If a thread is canceled *after* it returns from the syscall but before
> it reports the event to the call (i.e., while still in the syscall
> wrapper, thread cancellation rules require a check there) the event is
> lost.

Exactly. The same happens with sigwaitinfo(), and various other.

> Linus was only talking about the kernel side and how in the exit path
> such events are not lost.

Anyway, we could extend epoll to be mmapable...

--
Davi Arnaut
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