From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Subject: Re: Duration vs. Ada.Real_Time
Date: 30 Jan 2001 09:33:38 -0500
Date: 2001-01-30T14:46:43+00:00 [thread overview]
Message-ID: <uk87d9kjh.fsf@gsfc.nasa.gov> (raw)
In-Reply-To: 94vo82$kst$1@nnrp1.deja.com
Robert Dewar <robert_dewar@my-deja.com> writes:
> In article <3A71E4F6.6D7015AD@acm.org>,
> Marin David Condic <mcondic.auntie.spam@acm.org> wrote:
>
> > I would think that a reasonable implementation of Ada for
> > realtime systems would want to insure that the precision had
> > some relationship to the accuracy of the clock available.
>
> Why do you think that?
>
> The RM contains no encouragement for this thought!
>
> Duration is used for other things besides the delay statement.
Perhaps it would be more appropriate for Marin to request that type
Ada.Real_Time.Time_Span (LRM appendix D) match the hardware clock;
that is more clearly intended to be a "hard real-time" clock type.
> And also, programs do various calculations with Duration, if there
> is more precision, these calculations are more accurate.
I agree with Marin here; convert to a type that you know or control
the precision of to do computations.
--
-- Stephe
next prev parent reply other threads:[~2001-01-30 14:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <980495512.529981@edh3>
[not found] ` <8mac6.9236$R5.473526@news1.frmt1.sfba.home.com>
2001-01-26 15:30 ` Duration vs. Ada.Real_Time Robert Dewar
[not found] ` <3A71814B.7E8CCF60@acm.org>
2001-01-26 15:33 ` Robert Dewar
2001-01-26 20:58 ` Marin David Condic
2001-01-26 21:32 ` Ted Dennison
2001-01-27 5:01 ` Keith Thompson
2001-01-27 14:40 ` Marin David Condic
2001-01-27 14:34 ` Marin David Condic
2001-01-28 0:18 ` Robert Dewar
2001-01-29 14:54 ` Ted Dennison
2001-01-29 18:40 ` Marin David Condic
2001-02-08 3:32 ` Buz Cory
2001-02-08 15:34 ` Marin David Condic
2001-02-10 3:08 ` Steve Whalen
2001-01-28 0:13 ` Robert Dewar
2001-01-29 14:02 ` Marin David Condic
2001-01-30 14:33 ` Stephen Leake [this message]
2001-01-31 14:55 ` Marin David Condic
2001-01-31 16:03 ` Ted Dennison
2001-01-31 19:16 ` Marin David Condic
2001-01-31 20:53 ` Ted Dennison
2001-01-31 21:30 ` tmoran
2001-01-31 21:47 ` Marin David Condic
2001-02-01 14:18 ` Ted Dennison
2001-01-28 19:32 ` Simon Wright
2001-01-31 6:13 ` Robert Dewar
2001-01-31 15:07 ` Marin David Condic
2001-02-01 5:43 ` Robert Dewar
2001-01-31 5:51 Christoph Grein
2001-02-01 6:27 ` Simon Wright
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