From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Re: futex and timeouts
Date: 14 Mar 2002 22:56:09 -0800 [thread overview]
Message-ID: <a6s5u9$9o0$1@cesium.transmeta.com> (raw)
In-Reply-To: <20020314151846.EDCBF3FE07@smtp.linux.ibm.com> <E16lkRS-0001HN-00@wagner.rustcorp.com.au> <20020315060829.L4836@parcelfarce.linux.theplanet.co.uk>
Followup to: <20020315060829.L4836@parcelfarce.linux.theplanet.co.uk>
By author: Joel Becker <jlbec@evilplan.org>
In newsgroup: linux.dev.kernel
>
> On Fri, Mar 15, 2002 at 04:39:50PM +1100, Rusty Russell wrote:
> > Yep, sorry, my mistake. I suggest make it a relative "struct timespec
> > *" (more futureproof that timeval). It would make sense to split the
> > interface into futex_down and futex_up syuscalls, since futex_up
> > doesn't need a timeout arg, but I haven't for the moment.
>
> Why waste a syscall? The user is going to be using a library
> wrapper. They don't have to know that futex_up() calls sys_futex(futex,
> FUTEX_UP, NULL);
>
Syscalls are (by and large) cheap. Extra dispatches, however, hurt.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com>
next prev parent reply other threads:[~2002-03-15 6:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-13 18:26 futex and timeouts Hubertus Franke
2002-03-13 18:54 ` Ulrich Drepper
2002-03-14 4:15 ` Rusty Russell
2002-03-14 15:19 ` Hubertus Franke
2002-03-15 5:39 ` [PATCH] " Rusty Russell
2002-03-15 6:08 ` Joel Becker
2002-03-15 6:56 ` H. Peter Anvin [this message]
2002-03-15 8:49 ` Rusty Russell
2002-03-15 15:16 ` Hubertus Franke
2002-03-15 16:04 ` Joel Becker
2002-03-15 18:59 ` Hubertus Franke
2002-03-15 19:28 ` Joel Becker
2002-03-16 1:12 ` [Lse-tech] " george anzinger
2002-03-18 21:35 ` Hubertus Franke
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