From: "H . J . Lu" <hjl@lucon.org>
To: Kaz Kylheku <kaz@ashi.footprints.net>
Cc: Hiroyuki Machida <machida@sm.sony.co.jp>,
macro@ds2.pg.gda.pl, libc-alpha@sources.redhat.com,
linux-mips@oss.sgi.com
Subject: Re: [libc-alpha] Re: PATCH: Fix ll/sc for mips
Date: Thu, 31 Jan 2002 23:10:36 -0800 [thread overview]
Message-ID: <20020131231036.D32690@lucon.org> (raw)
In-Reply-To: <Pine.LNX.4.33.0201311952440.2305-100000@ashi.FootPrints.net>; from kaz@ashi.footprints.net on Thu, Jan 31, 2002 at 08:02:25PM -0800
On Thu, Jan 31, 2002 at 08:02:25PM -0800, Kaz Kylheku wrote:
> On Fri, 1 Feb 2002, Hiroyuki Machida wrote:
> > Please note that "sc" may fail even if nobody write the
> > variable. (See P.211 "8.4.2 Load-Linked/Sotre-Conditional" of "See
> > MIPS RUN" for more detail.)
> > So, after your patch applied, compare_and_swap() may fail, even if
> > *p is equal to oldval.
>
> I can't think of anything that will break because of this, as long
> as the compare_and_swap eventually succeeds on some subsequent trial.
> If the atomic operation has to abort for some reason other than *p being
> unequal to oldval, that should be cool.
Maybe we should document it in glibc, something like
compare_and_swap compares the contents of a variable with an old value.
If the values are equal and a new value is stored in the variable
atomically, 1 is returned; otherwise, 1 is returned.
H.J.
next prev parent reply other threads:[~2002-02-01 8:10 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-31 20:35 PATCH: Fix ll/sc for mips H . J . Lu
2002-01-31 22:17 ` Maciej W. Rozycki
2002-01-31 22:41 ` H . J . Lu
2002-02-01 3:35 ` Hiroyuki Machida
2002-02-01 4:02 ` [libc-alpha] " Kaz Kylheku
2002-02-01 4:02 ` Kaz Kylheku
2002-02-01 4:59 ` Hiroyuki Machida
2002-02-01 7:00 ` H . J . Lu
2002-02-01 11:12 ` Hiroyuki Machida
2002-02-01 10:49 ` Andreas Schwab
2002-02-01 11:23 ` Geoff Keating
2002-02-01 7:10 ` H . J . Lu [this message]
2002-02-01 7:17 ` H . J . Lu
2002-02-01 11:45 ` Maciej W. Rozycki
2002-02-01 18:29 ` PATCH: Fix ll/sc for mips (take 3) H . J . Lu
2002-02-01 23:01 ` Daniel Jacobowitz
2002-02-01 23:15 ` H . J . Lu
2002-02-02 2:37 ` Hiroyuki Machida
2002-02-04 9:32 ` Dominic Sweetman
2002-02-05 6:16 ` Jay Carlson
2002-02-05 8:28 ` Ralf Baechle
2002-02-05 15:10 ` Jay Carlson
2002-02-05 16:06 ` Jay Carlson
2002-02-02 3:26 ` Daniel Jacobowitz
2002-02-02 18:53 ` Justin Carlson
2002-02-02 20:03 ` H . J . Lu
2002-02-02 20:49 ` Hartvig Ekner
2002-02-02 20:49 ` Hartvig Ekner
2002-02-03 5:47 ` Justin Carlson
2002-02-04 19:17 ` Paul Koning
[not found] ` <mailpost.1012680250.7159@news-sj1-1>
2002-02-03 23:29 ` cgd
2002-02-04 6:07 ` Ralf Baechle
2002-02-04 9:46 ` Dominic Sweetman
2002-02-04 16:31 ` H . J . Lu
2002-02-04 16:46 ` Dominic Sweetman
2002-02-05 1:28 ` H . J . Lu
2002-02-05 2:58 ` Daniel Jacobowitz
2002-02-05 4:42 ` H . J . Lu
2002-02-05 4:47 ` Daniel Jacobowitz
2002-02-05 5:30 ` Justin Carlson
2002-02-05 8:39 ` Hartvig Ekner
2002-02-05 8:39 ` Hartvig Ekner
2002-02-05 11:37 ` Maciej W. Rozycki
2002-02-05 12:12 ` Ralf Baechle
2002-02-05 12:31 ` Maciej W. Rozycki
2002-02-05 12:38 ` Hartvig Ekner
2002-02-05 12:38 ` Hartvig Ekner
2002-02-05 13:28 ` Maciej W. Rozycki
2002-02-05 19:28 ` Hartvig Ekner
2002-02-05 19:28 ` Hartvig Ekner
2002-02-05 18:59 ` Ralf Baechle
2002-02-05 19:30 ` H . J . Lu
2002-02-05 21:54 ` H . J . Lu
2002-02-06 10:32 ` Ralf Baechle
2002-02-06 20:45 ` Why does -g turn off filling the delat slot? H . J . Lu
2002-02-06 21:00 ` PATCH: Modify the mips gas behavior for -g -O H . J . Lu
2002-02-06 21:16 ` Eric Christopher
2002-02-06 21:40 ` Ian Lance Taylor
2002-02-06 21:46 ` Eric Christopher
2002-02-06 22:00 ` PATCH: Define SUBTARGET_ASM_DEBUGGING_SPEC for Linux/mips H . J . Lu
2002-02-07 8:24 ` Eric Christopher
2002-02-06 11:37 ` PATCH: Fix ll/sc for mips (take 3) Maciej W. Rozycki
2002-02-04 17:44 ` cgd
2002-02-04 6:46 ` Ralf Baechle
2002-02-04 7:01 ` PATCH: Fix ll/sc for mips Ralf Baechle
2002-02-04 14:54 ` Maciej W. Rozycki
2002-02-01 11:50 ` Maciej W. Rozycki
2002-02-01 17:40 ` H . J . Lu
2002-02-01 21:41 ` Maciej W. Rozycki
2002-02-01 22:47 ` H . J . Lu
2002-02-02 11:06 ` Maciej W. Rozycki
2002-02-03 2:29 ` Ulrich Drepper
2002-02-03 2:29 ` Ulrich Drepper
2002-01-31 23:33 ` [libc-alpha] " Kaz Kylheku
2002-01-31 23:33 ` Kaz Kylheku
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