From: Sam Varshavchik <mrsam-W1w4QoW4mIDgLSHwZvcCBg@public.gmane.org>
To: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: "Michael Kerrisk"
<mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>,
"Davide Libenzi"
<davidel-AhlLAIvw+VEjIGhXcJzhZg@public.gmane.org>,
"Chris ¥¯ Heath" <chris-FSXMH2gLahXJKwlM9GxbOw@public.gmane.org>,
"David Schwartz" <davids-Rrbileazn+l54TAoqtyWWQ@public.gmane.org>,
dada1-fPLkHRcR87vqlBn2x/YWAg@public.gmane.org,
"Linux-Kernel@Vger. Kernel. Org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: epoll design problems with common fork/exec patterns
Date: Sun, 02 Mar 2008 10:11:57 -0500 [thread overview]
Message-ID: <cone.1204470717.369031.30230.500@commodore.email-scan.com> (raw)
In-Reply-To: cfd18e0f0802291154j612b4238i66cb8323b72814ca@mail.gmail.com
[-- Attachment #1: Type: text/plain, Size: 677 bytes --]
Hijacking this epoll thread, the following related question occurs to me:
#Q8
# Does an operation on a file descriptor affect the already collected but
#not yet reported events?
#
#A8
# You can do two operations on an existing file descriptor. Remove would
#be meaningless for this case. Modify will re-read available I/O.
Why is EPOLL_CTL_DEL considered meaningless? A process is wrapping up its
business and is preparing to remove the fd from the epoll set, and then
close the file descriptor itself. In the meantime, the fd became readable,
and a POLLIN event gets collected. So, what happens to the collected event,
when the EPOLL_CTL_DEL operation is made?
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next prev parent reply other threads:[~2008-03-02 15:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <MDEHLPKNGKAHNMBLJOLKAEHCHNAC.davids@webmaster.com>
[not found] ` <Pine.LNX.4.64.0710291147180.3387@alien.or.mcafeemobile.com>
[not found] ` <Pine.LNX.4.64.0710291147180.3387-GPJ85BhbkB8RepQJljzAVbITYcZ0+W3JAL8bYrjMMd8@public.gmane.org>
2008-02-26 15:13 ` epoll design problems with common fork/exec patterns Michael Kerrisk
[not found] ` <47C42CA7.4030607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2008-02-26 18:51 ` Davide Libenzi
[not found] ` <Pine.LNX.4.64.0802261049040.27243-GPJ85BhbkB8RepQJljzAVbITYcZ0+W3JAL8bYrjMMd8@public.gmane.org>
2008-02-27 1:30 ` Chris "ク" Heath
[not found] ` <1204075804.5238.7.camel-DBi1IKlRe8YXiSwHZUBl+UgmxNRb6L7S@public.gmane.org>
2008-02-27 19:35 ` Davide Libenzi
[not found] ` <Pine.LNX.4.64.0802271131180.377-GPJ85BhbkB8RepQJljzAVbITYcZ0+W3JAL8bYrjMMd8@public.gmane.org>
2008-02-28 13:12 ` Michael Kerrisk
[not found] ` <cfd18e0f0802280512q43a457d0sc9a8dc83c51e8e1c-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-28 13:23 ` Michael Kerrisk
[not found] ` <cfd18e0f0802280523p1bdacfc5s274387f8280238c8-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-28 19:34 ` Davide Libenzi
2008-02-28 19:23 ` Davide Libenzi
[not found] ` <Pine.LNX.4.64.0802281106050.7660-GPJ85BhbkB8RepQJljzAVbITYcZ0+W3JAL8bYrjMMd8@public.gmane.org>
2008-02-29 15:46 ` Michael Kerrisk
[not found] ` <cfd18e0f0802290746p3cb7efc9j72394cd77ff37829-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-29 19:19 ` Davide Libenzi
2008-02-29 19:54 ` Michael Kerrisk
2008-03-02 15:11 ` Sam Varshavchik [this message]
[not found] ` <cone.1204470717.369031.30230.500-lO+bjgoT4TKm14v+eVDVcBDJ/jce7dRH@public.gmane.org>
2008-03-02 21:44 ` Davide Libenzi
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