From: Kilgallen@SpamCop.net (Larry Kilgallen)
Subject: Re: ADA os talk
Date: 28 Aug 2001 10:50:45 -0500
Date: 2001-08-28T10:50:45-05:00 [thread overview]
Message-ID: <3CeB8M0VaOC6@eisner.encompasserve.org> (raw)
In-Reply-To: 9mg7fr$rm1$1@nh.pace.co.uk
In article <9mg7fr$rm1$1@nh.pace.co.uk>, "Marin David Condic" <dont.bother.mcondic.auntie.spam@[acm.org> writes:
> We used VMS on engine test stands to collect & process temperature/pressure
> sensor data in real time. I wasn't in on developing the software, but the
> requirements were that you could detect the interrupt and have a predictable
> latency to when you got to the ISR, even if other apps were running. (You
> had to record the data points at even time intervals - as you say, not
> necessarily "fast" but predictable.) We were able to run GUI apps at the
> same time an engine test was going on - albeit with the probability that
> mouse/window response was going to degrade, but it didn't stop the realtime
> app from getting serviced when it needed to.
>
> IIRC, VMS itself didn't guarantee realtime behavior, but if you took some
> smart guys and let them study it long enough, they could figure out how to
> get VMS to do what you wanted it to do. We accomplished the same sort of
> thing with MS-DOS because basically, you could get your real time app to
> move MS-DOS aside and just take over.
I don't suppose this "study" time was billed by the hour ?
Of course it is possible the documentation was worse during
the time period you are discussion.
> What would be nice is to have a workstation OS that didn't require you to
> become an expert or circumvent the OS to do realtime - just declare a
> process to be "realtime" and know that it can get certain services with
> certain predictable latencies and be sure that it has priority over anything
> else. (Dangerous, but necessary for realtime programming.)
Based on the real-time people I have met, I would say that each
shop is still going to study the situation to ensure they
are not making inwarranted assumptions.
next prev parent reply other threads:[~2001-08-28 15:50 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-26 23:00 ADA os talk Tony Gair
2001-08-27 3:28 ` Mike Silva
2001-08-27 4:58 ` Robert C. Leif, Ph.D.
2001-08-27 14:44 ` Marin David Condic
2001-08-27 18:41 ` Wes Groleau
2001-08-27 19:22 ` Marin David Condic
2001-08-27 18:44 ` Robert C. Leif, Ph.D.
2001-08-27 19:00 ` Marin David Condic
2001-08-29 17:53 ` B.Gaffney
2001-08-30 16:29 ` Serge Robyns
2001-08-27 19:24 ` David Starner
2001-08-27 21:07 ` Marin David Condic
2001-08-27 23:22 ` Larry Kilgallen
2001-08-28 13:48 ` Marin David Condic
2001-08-28 15:50 ` Larry Kilgallen [this message]
2001-08-28 16:14 ` Marin David Condic
2001-08-28 17:25 ` Larry Kilgallen
2001-08-30 14:44 ` Robert Spooner
2001-08-28 14:29 ` Gary Scott
2001-08-28 9:25 ` Tarjei T. Jensen
2001-08-29 10:33 ` Tony Gair
2001-08-29 14:15 ` Marin David Condic
2001-08-29 14:45 ` Larry Kilgallen
2001-08-29 15:27 ` Marin David Condic
2001-08-29 16:11 ` chris.danx
2001-08-29 17:20 ` Marin David Condic
2001-08-29 17:02 ` Ray Blaak
2001-08-29 17:43 ` Larry Kilgallen
2001-09-02 8:01 ` McDoobie
2001-09-02 19:58 ` Tony Gair
2001-09-02 23:02 ` Darren New
2001-09-04 12:47 ` Marin David Condic
2001-09-02 19:43 ` Tony Gair
2001-09-02 20:16 ` chris.danx
2001-09-03 10:01 ` Ian
2001-09-03 19:31 ` Ada OS talk (was: ADA os talk) M. A. Alves
2001-09-04 13:09 ` Marin David Condic
2001-09-04 14:57 ` M. A. Alves
2001-09-04 14:40 ` Marin David Condic
2001-09-04 15:12 ` Ada OS talk M. A. Alves
2001-09-06 15:42 ` Ada OS talk (was: ADA os talk)(and now is "About you guys".) McDoobie
2001-08-27 5:15 ` ADA os talk Bobby D. Bryant
2001-08-27 14:04 ` Wes Groleau
[not found] ` <YOsi7.14505$3f.3377844@news2-win.server.ntlworld.com>
2001-08-27 17:16 ` Warren W. Gay VE3WWG
2001-08-27 17:33 ` Gerhard Häring
2001-08-30 16:43 ` Serge Robyns
2001-08-27 18:02 ` Marin David Condic
2001-08-27 17:37 ` Brian Catlin
2001-09-02 7:26 ` ADA os talk (Innovate!) McDoobie
2001-09-02 10:53 ` Dmitry A. Kazakov
2001-09-04 12:33 ` Marin David Condic
2001-09-04 12:17 ` Marin David Condic
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