From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
akpm@osdl.org, torvalds@osdl.org, drepper@redhat.com
Subject: Re: Add pselect, ppoll system calls.
Date: Sun, 12 Jun 2005 23:48:22 +0100 [thread overview]
Message-ID: <1118616499.9949.103.camel@localhost.localdomain> (raw)
In-Reply-To: <1118444314.4823.81.camel@localhost.localdomain>
On Gwe, 2005-06-10 at 23:58, David Woodhouse wrote:
> The idea of pselect is that if one wants to wait for an event, either a
> signal or something on a file descriptor, an atomic test is needed to
> prevent race conditions. (Suppose the signal handler sets a global flag
> and returns. Then a test of this global flag followed by a call of
> select() could hang indefinitely if the signal arrived just after the
> test but just before the call. On the other hand, pselect allows one to
See sleep(), going back to oh V7 unix. It has this avoided nicely in
user space using setjmp (nowdays using sigsetjmp).
If glibc has a race why not just fix glibc ?
next prev parent reply other threads:[~2005-06-12 22:51 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-10 22:58 Add pselect, ppoll system calls David Woodhouse
2005-06-12 22:48 ` Alan Cox [this message]
2005-06-13 0:26 ` Linus Torvalds
2005-06-13 1:16 ` jnf
2005-06-13 3:26 ` Linus Torvalds
2005-06-13 6:22 ` Ulrich Drepper
2005-06-13 9:16 ` bert hubert
2005-06-13 9:41 ` David Woodhouse
2005-06-13 11:05 ` Christoph Hellwig
2005-06-13 11:14 ` Jakub Jelinek
2005-06-13 11:24 ` David Woodhouse
2005-06-13 15:38 ` Ulrich Drepper
2005-06-13 16:02 ` David Woodhouse
2005-06-13 16:10 ` Ulrich Drepper
2005-06-13 16:29 ` David Woodhouse
2005-06-13 16:31 ` Ulrich Drepper
2005-06-13 21:58 ` David Woodhouse
2005-06-13 22:01 ` Ulrich Drepper
2005-06-13 16:36 ` Jakub Jelinek
2005-06-15 11:36 ` David Woodhouse
2005-08-05 10:42 ` pselect() modifying timeout Michael Kerrisk
2005-08-05 14:50 ` Ulrich Drepper
2005-08-05 20:08 ` Michael Kerrisk
2005-08-08 11:10 ` Alan Cox
2005-08-05 11:58 ` Add pselect, ppoll system calls Michael Kerrisk
2005-08-05 12:49 ` Michael Kerrisk
2005-08-25 0:04 ` David Woodhouse
2005-08-25 0:34 ` Ulrich Drepper
2005-08-26 6:46 ` Michael Kerrisk
2005-06-13 15:35 ` Ulrich Drepper
2005-06-13 7:23 ` Benjamin Herrenschmidt
2005-06-13 7:29 ` David Woodhouse
2005-06-13 22:56 ` Benjamin Herrenschmidt
2005-06-13 11:15 ` Alan Cox
2005-06-13 11:27 ` David Woodhouse
2005-06-13 15:40 ` Ulrich Drepper
-- strict thread matches above, loose matches on Subject: below --
2005-06-13 19:38 Mattias Engdegård
2005-06-13 19:57 ` Chris Friesen
2005-06-13 20:08 ` Mattias Engdegård
2005-06-13 20:23 ` Valdis.Kletnieks
2005-06-14 14:07 ` Mattias Engdegård
2005-06-14 14:16 ` Bernd Petrovitsch
2005-06-14 14:42 ` Mattias Engdegård
2005-06-14 14:54 ` Bernd Petrovitsch
2005-06-14 15:27 ` Valdis.Kletnieks
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