From: Davide Libenzi <davidel@xmailserver.org>
To: Jamie Lokier <jamie@shareable.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch] futex API cleanups, futex-api-cleanup-2.5.69-A2
Date: Tue, 20 May 2003 09:54:27 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.55.0305200947460.3636@bigblue.dev.mcafeelabs.com> (raw)
In-Reply-To: <20030520014403.GA14851@mail.jlokier.co.uk>
On Tue, 20 May 2003, Jamie Lokier wrote:
> Yes, they do and it should work (I haven't tried, though).
>
> There is a practical problem when waiting on a futex in multiple
> threads using epoll: you need a separate fd per waiter, rather than an
> fd per waited-on futex. This is because some uses of futexes depend
> on waiters being woken in the exact order that they were queued.
Not really Jamie. See a Futex event is not much different from a network
one. When the event shows up, one thread will pick it up (epoll_wait) and
will handle it. A futex event will very likely be a green light for some
sort of resource usage that whatever thread can pick up and handle.
- Davide
next prev parent reply other threads:[~2003-05-20 16:42 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-19 9:31 [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Ingo Molnar
2003-05-19 10:10 ` Christoph Hellwig
2003-05-19 10:16 ` Ingo Molnar
2003-05-19 11:49 ` Christoph Hellwig
2003-05-19 12:33 ` [patch] futex API cleanups, futex-api-cleanup-2.5.69-A2 Ingo Molnar
2003-05-19 12:51 ` Ingo Molnar
2003-05-19 14:47 ` bert hubert
2003-05-19 16:02 ` Ingo Molnar
2003-05-19 15:18 ` Linus Torvalds
2003-05-19 16:06 ` Ingo Molnar
2003-05-19 23:33 ` Jamie Lokier
2003-05-20 0:39 ` Rusty Russell
2003-05-20 1:14 ` Davide Libenzi
2003-05-20 1:44 ` Jamie Lokier
2003-05-20 16:54 ` Davide Libenzi [this message]
2003-05-20 17:59 ` Jamie Lokier
2003-05-21 23:56 ` Davide Libenzi
2003-05-20 1:50 ` Jamie Lokier
2003-05-20 0:15 ` Rusty Russell
2003-05-20 0:08 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Rusty Russell
2003-05-20 0:31 ` Valdis.Kletnieks
2003-05-19 10:23 ` Andrew Morton
2003-05-19 10:30 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D4 Ingo Molnar
2003-05-20 0:04 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Rusty Russell
2003-05-20 0:40 ` Ulrich Drepper
2003-05-20 1:46 ` Rusty Russell
2003-05-20 2:11 ` Ulrich Drepper
2003-05-20 6:27 ` Ingo Molnar
2003-05-20 6:56 ` Christoph Hellwig
2003-05-20 8:57 ` Rusty Russell
2003-05-20 9:03 ` Ingo Molnar
2003-05-20 9:51 ` Christoph Hellwig
2003-05-20 12:56 ` [patch] futex patches, futex-2.5.69-A2 Ingo Molnar
2003-05-20 14:08 ` Christoph Hellwig
2003-05-20 16:02 ` Ingo Molnar
2003-05-20 19:55 ` Christoph Hellwig
2003-05-21 5:06 ` Martin Schlemmer
2003-05-21 6:31 ` Christoph Hellwig
2003-05-20 15:46 ` [patch] futex requeueing feature, futex-requeue-2.5.69-D3 Linus Torvalds
2003-05-20 9:12 ` Ingo Oeser
2003-05-20 15:41 ` Linus Torvalds
2003-05-20 8:55 ` Rusty Russell
2003-05-20 6:19 ` Ingo Molnar
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