From: Ulrich Drepper <drepper@redhat.com>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: David Miller <davem@davemloft.net>, Andrew Morton <akpm@osdl.org>,
netdev <netdev@vger.kernel.org>,
Zach Brown <zach.brown@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
Chase Venters <chase.venters@clientec.com>,
Johann Borck <johann.borck@densedata.com>,
linux-kernel@vger.kernel.org, Jeff Garzik <jeff@garzik.org>
Subject: Re: [take25 1/6] kevent: Description.
Date: Wed, 22 Nov 2006 15:52:11 -0800 [thread overview]
Message-ID: <4564E2AB.1020202@redhat.com> (raw)
In-Reply-To: <11641265982190@2ka.mipt.ru>
Evgeniy Polyakov wrote:
> + struct kevent_ring
> + {
> + unsigned int ring_kidx, ring_uidx, ring_over;
> + struct ukevent event[0];
> + }
> + [...]
> +ring_uidx - index of the first entry userspace can start reading from
Do we need this value in the structure? Userlevel cannot and should not
be able to modify it. So, userland has in any case to track the tail
pointer itself. Why then have this value at all?
After kevent_init() the tail pointer is implicitly assumed to be 0.
Since the front pointer (well index) is also zero nothing is available
for reading.
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
next prev parent reply other threads:[~2006-11-22 23:55 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1154985aa0591036@2ka.mipt.ru>
2006-10-27 16:10 ` [take21 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-10-27 16:10 ` [take21 1/4] kevent: Core files Evgeniy Polyakov
2006-10-27 16:10 ` [take21 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-10-27 16:10 ` [take21 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-10-27 16:10 ` [take21 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-10-28 10:04 ` [take21 2/4] kevent: poll/select() notifications Eric Dumazet
2006-10-28 10:08 ` Evgeniy Polyakov
2006-10-28 10:28 ` [take21 1/4] kevent: Core files Eric Dumazet
2006-10-28 10:53 ` Evgeniy Polyakov
2006-10-28 12:36 ` Eric Dumazet
2006-10-28 13:03 ` Evgeniy Polyakov
2006-10-28 13:23 ` Eric Dumazet
2006-10-28 13:28 ` Evgeniy Polyakov
2006-10-28 13:34 ` Eric Dumazet
2006-10-28 13:47 ` Evgeniy Polyakov
2006-10-27 16:42 ` [take21 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-11-07 11:26 ` Jeff Garzik
2006-11-07 11:46 ` Jeff Garzik
2006-11-07 11:58 ` Evgeniy Polyakov
2006-11-07 11:51 ` Evgeniy Polyakov
2006-11-07 12:17 ` Jeff Garzik
2006-11-07 12:29 ` Evgeniy Polyakov
2006-11-07 12:32 ` Jeff Garzik
2006-11-07 19:34 ` Andrew Morton
2006-11-07 20:52 ` David Miller
2006-11-07 21:38 ` Andrew Morton
2006-11-01 11:36 ` [take22 " Evgeniy Polyakov
2006-11-01 11:36 ` [take22 1/4] kevent: Core files Evgeniy Polyakov
2006-11-01 11:36 ` [take22 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-11-01 11:36 ` [take22 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-11-01 11:36 ` [take22 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-11-01 13:06 ` [take22 0/4] kevent: Generic event handling mechanism Pavel Machek
2006-11-01 13:25 ` Evgeniy Polyakov
2006-11-01 16:05 ` Pavel Machek
2006-11-01 16:24 ` Evgeniy Polyakov
2006-11-01 18:13 ` Oleg Verych
2006-11-01 18:57 ` Evgeniy Polyakov
2006-11-02 2:12 ` Nate Diller
2006-11-02 6:21 ` Evgeniy Polyakov
2006-11-02 19:40 ` Nate Diller
2006-11-03 8:42 ` Evgeniy Polyakov
2006-11-03 8:57 ` Pavel Machek
2006-11-03 9:04 ` David Miller
2006-11-07 12:05 ` Jeff Garzik
2006-11-03 9:13 ` Evgeniy Polyakov
2006-11-05 11:19 ` Pavel Machek
2006-11-05 11:43 ` Evgeniy Polyakov
[not found] ` <aaf959cb0611011829k36deda6ahe61bcb9bf8e612e1@mail.gmail.com>
[not found] ` <aaf959cb0611011830j1ca3e469tc4a6af3a2a010fa@mail.gmail.com>
[not found] ` <4549A261.9010007@cosmosbay.com>
2006-11-03 2:42 ` zhou drangon
2006-11-03 9:16 ` Evgeniy Polyakov
2006-11-07 12:02 ` Jeff Garzik
2006-11-03 18:49 ` Oleg Verych
2006-11-04 10:24 ` Evgeniy Polyakov
2006-11-04 17:47 ` Evgeniy Polyakov
2006-11-01 16:07 ` James Morris
2006-11-07 16:50 ` [take23 0/5] " Evgeniy Polyakov
2006-11-07 16:50 ` [take23 1/5] kevent: Description Evgeniy Polyakov
2006-11-07 16:50 ` [take23 2/5] kevent: Core files Evgeniy Polyakov
2006-11-07 16:50 ` [take23 3/5] kevent: poll/select() notifications Evgeniy Polyakov
2006-11-07 16:50 ` [take23 4/5] kevent: Socket notifications Evgeniy Polyakov
2006-11-07 16:50 ` [take23 5/5] kevent: Timer notifications Evgeniy Polyakov
2006-11-07 22:53 ` [take23 3/5] kevent: poll/select() notifications Davide Libenzi
2006-11-08 8:45 ` Evgeniy Polyakov
2006-11-08 17:03 ` Evgeniy Polyakov
2006-11-07 22:16 ` [take23 2/5] kevent: Core files Andrew Morton
2006-11-08 8:24 ` Evgeniy Polyakov
2006-11-07 22:16 ` [take23 1/5] kevent: Description Andrew Morton
2006-11-08 8:23 ` Evgeniy Polyakov
2006-11-07 22:17 ` [take23 0/5] kevent: Generic event handling mechanism Andrew Morton
2006-11-08 8:21 ` Evgeniy Polyakov
2006-11-08 14:51 ` Eric Dumazet
2006-11-08 22:03 ` Andrew Morton
2006-11-08 22:44 ` Davide Libenzi
2006-11-08 23:07 ` Eric Dumazet
2006-11-08 23:56 ` Davide Libenzi
2006-11-09 7:24 ` Eric Dumazet
2006-11-09 7:52 ` Eric Dumazet
2006-11-09 17:12 ` Davide Libenzi
2006-11-09 8:23 ` [take24 0/6] " Evgeniy Polyakov
2006-11-09 8:23 ` [take24 1/6] kevent: Description Evgeniy Polyakov
2006-11-09 8:23 ` [take24 2/6] kevent: Core files Evgeniy Polyakov
2006-11-09 8:23 ` [take24 3/6] kevent: poll/select() notifications Evgeniy Polyakov
2006-11-09 8:23 ` [take24 4/6] kevent: Socket notifications Evgeniy Polyakov
2006-11-09 8:23 ` [take24 5/6] kevent: Timer notifications Evgeniy Polyakov
2006-11-09 8:23 ` [take24 6/6] kevent: Pipe notifications Evgeniy Polyakov
2006-11-09 9:08 ` [take24 3/6] kevent: poll/select() notifications Eric Dumazet
2006-11-09 9:29 ` Evgeniy Polyakov
2006-11-09 18:51 ` Davide Libenzi
2006-11-09 19:10 ` Evgeniy Polyakov
2006-11-09 19:42 ` Davide Libenzi
2006-11-09 20:10 ` Davide Libenzi
2006-11-11 17:36 ` [take24 7/6] kevent: signal notifications Evgeniy Polyakov
2006-11-11 22:28 ` [take24 0/6] kevent: Generic event handling mechanism Ulrich Drepper
2006-11-13 10:54 ` Evgeniy Polyakov
2006-11-13 11:16 ` Evgeniy Polyakov
2006-11-20 0:02 ` Ulrich Drepper
2006-11-20 8:25 ` Evgeniy Polyakov
2006-11-20 8:43 ` Andrew Morton
2006-11-20 8:51 ` Evgeniy Polyakov
2006-11-20 9:15 ` Andrew Morton
2006-11-20 9:19 ` Evgeniy Polyakov
2006-11-20 20:29 ` Ulrich Drepper
2006-11-20 21:46 ` Jeff Garzik
2006-11-20 21:52 ` Ulrich Drepper
2006-11-21 9:09 ` Ingo Oeser
2006-11-22 11:38 ` Michael Tokarev
2006-11-22 11:47 ` Evgeniy Polyakov
2006-11-22 12:33 ` Jeff Garzik
2006-11-21 9:53 ` Evgeniy Polyakov
2006-11-21 16:58 ` Ulrich Drepper
2006-11-21 17:43 ` Evgeniy Polyakov
2006-11-21 18:46 ` Evgeniy Polyakov
2006-11-21 20:01 ` Jeff Garzik
2006-11-22 10:41 ` Evgeniy Polyakov
2006-11-21 20:19 ` Jeff Garzik
2006-11-22 10:39 ` Evgeniy Polyakov
2006-11-22 7:38 ` Ulrich Drepper
2006-11-22 10:44 ` Evgeniy Polyakov
2006-11-22 21:02 ` Ulrich Drepper
2006-11-23 12:23 ` Evgeniy Polyakov
2006-11-23 8:52 ` Kevent POSIX timers support Evgeniy Polyakov
2006-11-23 20:26 ` Ulrich Drepper
2006-11-24 9:50 ` Evgeniy Polyakov
2006-11-27 18:20 ` Ulrich Drepper
2006-11-27 18:24 ` David Miller
2006-11-27 18:36 ` Ulrich Drepper
2006-11-27 18:49 ` David Miller
2006-11-28 9:16 ` Evgeniy Polyakov
2006-11-28 19:13 ` David Miller
2006-11-28 19:22 ` Evgeniy Polyakov
2006-12-12 1:36 ` David Miller
2006-12-12 5:31 ` Evgeniy Polyakov
2006-11-28 9:16 ` Evgeniy Polyakov
2006-11-22 7:33 ` [take24 0/6] kevent: Generic event handling mechanism Ulrich Drepper
2006-11-22 10:38 ` Evgeniy Polyakov
2006-11-22 22:22 ` Ulrich Drepper
2006-11-23 12:18 ` Evgeniy Polyakov
2006-11-23 22:23 ` Ulrich Drepper
2006-11-24 10:57 ` Evgeniy Polyakov
2006-11-27 19:12 ` Ulrich Drepper
2006-11-28 11:00 ` Evgeniy Polyakov
2006-11-22 12:09 ` Evgeniy Polyakov
2006-11-22 12:15 ` Evgeniy Polyakov
2006-11-22 13:46 ` Evgeniy Polyakov
2006-11-22 22:24 ` Ulrich Drepper
2006-11-23 12:22 ` Evgeniy Polyakov
2006-11-23 20:34 ` Ulrich Drepper
2006-11-24 10:58 ` Evgeniy Polyakov
2006-11-27 18:23 ` Ulrich Drepper
2006-11-28 10:13 ` Evgeniy Polyakov
2006-12-27 20:45 ` Ulrich Drepper
2006-12-28 9:50 ` Evgeniy Polyakov
2006-11-21 16:29 ` [take25 " Evgeniy Polyakov
2006-11-21 16:29 ` [take25 1/6] kevent: Description Evgeniy Polyakov
2006-11-21 16:29 ` [take25 2/6] kevent: Core files Evgeniy Polyakov
2006-11-21 16:29 ` [take25 3/6] kevent: poll/select() notifications Evgeniy Polyakov
2006-11-21 16:29 ` [take25 4/6] kevent: Socket notifications Evgeniy Polyakov
2006-11-21 16:29 ` [take25 5/6] kevent: Timer notifications Evgeniy Polyakov
2006-11-21 16:29 ` [take25 6/6] kevent: Pipe notifications Evgeniy Polyakov
2006-11-22 11:20 ` Eric Dumazet
2006-11-22 11:30 ` Evgeniy Polyakov
2006-11-22 23:46 ` [take25 1/6] kevent: Description Ulrich Drepper
2006-11-23 11:52 ` Evgeniy Polyakov
2006-11-23 19:45 ` Ulrich Drepper
2006-11-24 11:01 ` Evgeniy Polyakov
2006-11-24 16:06 ` Ulrich Drepper
2006-11-24 16:14 ` Evgeniy Polyakov
2006-11-24 16:31 ` Evgeniy Polyakov
2006-11-27 19:20 ` Ulrich Drepper
2006-11-22 23:52 ` Ulrich Drepper [this message]
2006-11-23 11:55 ` Evgeniy Polyakov
2006-11-23 20:00 ` Ulrich Drepper
2006-11-23 21:49 ` Hans Henrik Happe
2006-11-23 22:34 ` Ulrich Drepper
2006-11-24 11:50 ` Evgeniy Polyakov
2006-11-24 16:17 ` Ulrich Drepper
2006-11-24 11:46 ` Evgeniy Polyakov
2006-11-24 16:30 ` Ulrich Drepper
2006-11-24 16:49 ` Evgeniy Polyakov
2006-11-27 19:23 ` Ulrich Drepper
2006-11-23 22:33 ` Ulrich Drepper
2006-11-23 22:48 ` Jeff Garzik
2006-11-23 23:45 ` Ulrich Drepper
2006-11-24 0:48 ` Eric Dumazet
2006-11-24 8:14 ` Andrew Morton
2006-11-24 8:33 ` Eric Dumazet
2006-11-24 15:26 ` Ulrich Drepper
2006-11-24 0:14 ` Hans Henrik Happe
2006-11-24 12:05 ` Evgeniy Polyakov
2006-11-24 12:13 ` Evgeniy Polyakov
2006-11-27 19:43 ` Ulrich Drepper
2006-11-28 10:26 ` Evgeniy Polyakov
2006-11-30 19:14 ` [take26 0/8] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-11-30 19:14 ` [take26 1/8] kevent: Description Evgeniy Polyakov
2006-11-30 19:14 ` [take26 2/8] kevent: Core files Evgeniy Polyakov
2006-11-30 19:14 ` [take26 3/8] kevent: poll/select() notifications Evgeniy Polyakov
2006-11-30 19:14 ` [take26 4/8] kevent: Socket notifications Evgeniy Polyakov
2006-11-30 19:14 ` [take26 5/8] kevent: Timer notifications Evgeniy Polyakov
2006-11-30 19:14 ` [take26 6/8] kevent: Pipe notifications Evgeniy Polyakov
2006-11-30 19:14 ` [take26 7/8] kevent: Signal notifications Evgeniy Polyakov
2006-11-30 19:14 ` [take26 8/8] kevent: Kevent posix timer notifications Evgeniy Polyakov
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