From: kaz@vision.crest.nt.com (Kaz Kylheku)
Subject: Re: Waiver question
Date: 1997/05/01
Date: 1997-05-01T00:00:00+00:00 [thread overview]
Message-ID: <5kb8ol$18o@bcrkh13.bnr.ca> (raw)
In-Reply-To: E9G869.CqB@world.std.com
In article <E9G869.CqB@world.std.com>,
Robert A Duff <bobduff@world.std.com> wrote:
>In article <5k52k2$7v0$1@news.nyu.edu>,
>Richard Kenner <kenner@lab.ultra.nyu.edu> wrote:
>>The problem with these sequences is that they are not atomic. That
>>is that problem that will be remedied on Alpha processors starting
>>with EV56.
>
>Why is that a problem?
Because you may wish to code an interrupt service routine for an embedded
system without dropping down to the assembly language level. In that case
it becomes important to know that you can modify some variable atomically;
you suddenly care how the access is compiled into machine code. It's not
practical or desirable to write interrupt service routines in assembly
language.
If access to that object is not atomic, the process that was interrupted could
have been in the middle of trying to read that variable.
next prev parent reply other threads:[~1997-05-01 0:00 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-04-18 0:00 Waiver question Ken Garlington
1997-04-19 0:00 ` Tom Moran
1997-04-20 0:00 ` Steve Doiel
1997-04-20 0:00 ` Dean Runzel
1997-04-22 0:00 ` Ken Garlington
1997-04-20 0:00 ` Robert Dewar
1997-04-21 0:00 ` Ken Garlington
1997-04-22 0:00 ` Ken Garlington
1997-04-23 0:00 ` Corey Minyard
1997-04-24 0:00 ` Richard Kenner
1997-04-28 0:00 ` Larry Kilgallen
1997-04-28 0:00 ` Corey Minyard
1997-04-29 0:00 ` Robert Dewar
1997-04-29 0:00 ` Kaz Kylheku
1997-04-29 0:00 ` Laurent Guerby
1997-04-30 0:00 ` Corey Minyard
1997-04-29 0:00 ` Richard Kenner
1997-04-30 0:00 ` Robert A Duff
1997-05-01 0:00 ` Kaz Kylheku [this message]
1997-05-02 0:00 ` Robert A Duff
1997-05-02 0:00 ` Larry Kilgallen
1997-05-02 0:00 ` Robert Dewar
1997-05-02 0:00 ` Robert A Duff
1997-05-02 0:00 ` Larry Kilgallen
1997-05-03 0:00 ` Robert A Duff
1997-05-03 0:00 ` Larry Kilgallen
1997-05-04 0:00 ` Robert Dewar
1997-05-04 0:00 ` Robert Dewar
1997-05-06 0:00 ` John M. Mills
1997-04-30 0:00 ` Robert Dewar
1997-05-01 0:00 ` Larry Kilgallen
1997-05-07 0:00 ` Bad .diff files in gnat-3.09 in Linux Benoit Jauvin-Girard
1997-05-09 0:00 ` Albert K. Lee
1997-04-29 0:00 ` Waiver question Robert Dewar
1997-04-23 0:00 ` Tarjei Jensen
1997-04-21 0:00 ` Robert I. Eachus
1997-04-21 0:00 ` Robert Dewar
1997-04-22 0:00 ` Robert I. Eachus
1997-04-23 0:00 ` Robert Dewar
1997-04-22 0:00 ` Ken Garlington
1997-04-23 0:00 ` Robert S. White
1997-04-24 0:00 ` Robert Dewar
1997-04-24 0:00 ` Steve Vestal
1997-04-25 0:00 ` Ken Garlington
1997-04-25 0:00 ` Robert I. Eachus
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