From: Ted Dennison <dennison@telepath.com>
Subject: Re: Using "delay until" in real-time
Date: Wed, 13 Dec 2000 17:41:00 GMT
Date: 2000-12-13T17:41:00+00:00 [thread overview]
Message-ID: <918cba$tkm$1@nnrp1.deja.com> (raw)
In-Reply-To: 3A37A974.C85EB683@mindspring.com
In article <3A37A974.C85EB683@mindspring.com>,
Larry Hazel <lhazel@mindspring.com> wrote:
>
>
> Why don't they have the same rounding problem in FORTRAN? If 60 Hz
can't be
> done exactly in the hardware, language shouldn't matter. Are they using
> different hardware where 60 Hz is exact?
Fortran has no such problem because Fortran has no tasking. It would be
forced to use the OS facilities, which would probably involve doing a
taskDelay X (where X is an intergral number of clock ticks). I could of
course do that in Ada too. But the issue I raised here deals with the
Ada mechanism, which is "delay until", and uses units of seconds. If the
OS's "ticks" can't be represented exactly in seconds, then the problem
arises.
--
T.E.D.
http://www.telepath.com/~dennison/Ted/TED.html
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next prev parent reply other threads:[~2000-12-13 17:41 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-12 16:27 Using "delay until" in real-time Ted Dennison
2000-12-12 18:01 ` Mike Silva
2000-12-12 19:57 ` Ted Dennison
2000-12-12 23:02 ` Mike Silva
2000-12-12 23:49 ` Ted Dennison
2000-12-18 6:26 ` Ray Blaak
2000-12-12 20:00 ` Ken Garlington
2000-12-12 20:40 ` Ted Dennison
2000-12-13 4:02 ` Ken Garlington
2000-12-13 14:29 ` Ted Dennison
2000-12-13 16:53 ` Larry Hazel
2000-12-13 17:41 ` Ted Dennison [this message]
2000-12-12 20:22 ` Keith Thompson
2000-12-12 20:54 ` Ted Dennison
2000-12-13 5:35 ` tmoran
2000-12-12 20:23 ` David C. Hoos, Sr.
2000-12-12 21:58 ` Ted Dennison
2000-12-12 23:18 ` Jeff Carter
2000-12-12 21:18 ` JP Thornley
2000-12-12 22:31 ` Ted Dennison
2000-12-13 8:02 ` Brian Orpin
2000-12-13 17:32 ` JP Thornley
2000-12-12 23:09 ` Ted Dennison
2000-12-13 7:43 ` Brian Orpin
2000-12-15 0:27 ` Frank
2000-12-19 7:50 ` Martin Gangkofer
2000-12-20 3:32 ` Ted Dennison
2000-12-20 5:29 ` tmoran
2000-12-20 7:59 ` Martin Gangkofer
2000-12-20 9:15 ` java servlets JF Harrison
2000-12-20 12:50 ` Using "delay until" in real-time Marin David Condic
2000-12-21 0:08 ` Alejandro R. Mosteo
2000-12-20 3:17 ` Ted Dennison
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