From: Ted Dennison <dennison@telepath.com>
Subject: Re: Duration vs. Ada.Real_Time
Date: Fri, 26 Jan 2001 21:32:01 GMT
Date: 2001-01-26T21:32:01+00:00 [thread overview]
Message-ID: <94sqch$fls$1@nnrp1.deja.com> (raw)
In-Reply-To: 3A71E4F6.6D7015AD@acm.org
In article <3A71E4F6.6D7015AD@acm.org>,
Marin David Condic <mcondic.auntie.spam@acm.org> wrote:
> I would think that a reasonable implementation of Ada for realtime
> systems would want to insure that the precision had some relationship
> to the accuracy of the clock available. Obviously, for
Do you mean "accuracy" or "frequency"?
...
> be changed for the language. But stating, for example, that the
> precision of a time representation can go down to atto-seconds can
> easily mislead one to believe that the measurement of time is going to
> be something close to that precision.
This gets back around to the issue we were discussing a couple of weeks
ago. If the language requires units of seconds, but the system's clock
used some incompatable system like Hz (eg: 60 Hz, which can't be
represented exactly in terms of fixed-point seconds), then you (or at
least *I*) would actually prefer a much higher precision, so that your
error in representation isn't so great when you start to do math with it.
--
T.E.D.
http://www.telepath.com/~dennison/Ted/TED.html
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next prev parent reply other threads:[~2001-01-26 21:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <980495512.529981@edh3>
[not found] ` <8mac6.9236$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 [this message]
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
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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