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

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Message-ID: <a36005b50705071519k40449ed2p7b9ece22cc19219a@mail.gmail.com>
Date:	Mon, 7 May 2007 15:19:22 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Davi Arnaut" <davi@...ent.com.br>
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

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.

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.

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