From: bobduff@world.std.com (Robert A Duff)
Subject: Re: Waiver question
Date: 1997/05/03
Date: 1997-05-03T00:00:00+00:00 [thread overview]
Message-ID: <E9KxAK.IyC@world.std.com> (raw)
In-Reply-To: 1997May2.164921.1@eisner
In article <1997May2.164921.1@eisner>,
Larry Kilgallen <kilgallen@eisner.decus.org> wrote:
>A casual programmer would presume that if variable A is only modified
>by task AA and variable B is only modified by task BB then they are
>task-safe. This is not true if the variables share a longword on
>Alpha. Having variables default to not sharing a longword goes a
>long way toward eliminating this exposure.
OK, but remember that we're only talking about subcomponents of the same
record or array, here. Two different object declarations always produce
independently addressable objects -- it's just a question of whether X.A
and X.B are independently addressable (which currently depends on
whether the type of X is packed).
>Regarding Robert Dewar's comment about DEC changing their mind
>with regard to byte instructions, I believe that was driven by
>the need to emulate code compiled for Intel machines which had
>never gotten recompiled specifically for Alpha. Market realities,
>rather than machine efficiency are at play.
Maybe DEC wanted to be Ada-friendly. ;-)
- Bob
next prev parent reply other threads:[~1997-05-03 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 ` Laurent Guerby
1997-04-30 0:00 ` Corey Minyard
1997-04-29 0:00 ` Robert Dewar
1997-04-29 0:00 ` Kaz Kylheku
1997-04-29 0:00 ` Robert Dewar
1997-04-29 0:00 ` Richard Kenner
1997-04-30 0:00 ` Robert A Duff
1997-05-01 0:00 ` Kaz Kylheku
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 [this message]
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
1997-04-23 0:00 ` Waiver question 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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