From: mips!murphy@decwrl.dec.com (Mike Murphy)
Subject: Re: Ada and Unix--Blocked Tasks
Date: 6 Aug 91 18:48:53 GMT [thread overview]
Message-ID: <6629@spim.mips.COM> (raw)
In article <1991Aug6.040550.785@beaver.cs.washington.edu> mfeldman@june.cs.wash
ington.edu (Mike Feldman) writes:
>What Paul might be getting at is the notion that an Ada compiler could
>(should) map each Ada task onto an OS-level process. I see no reason in
>principle why this could not be done; indeed, I think there may be vendors
>who are doing it in Unix (can anyone confirm this?). I believe I heard
>that one of the MVS (IBM mainframe) Ada systems can map Ada tasks to MVS
>tasks (can anyone confirm?). In practice, I imagine that vendors are
>keeping an ada program - tasks and all - in one OS-level process for
>efficiency, reasoning that mapping tasks onto processes is overkill.
Sequent, Encore, and Alliant have Ada runtimes (based on the Verdix
compiler) that can map tasking into multiple processes on Unix; but in
each case the Unix is an extended Unix that provides some support for
doing so. Also, it is interesting to note that these systems do not
simply spawn one process per task but instead spawn N processes, and
then switch T tasks between those processes, where T can be > N.
Intermetrics MVS compiler can map Ada tasks to MVS tasks.
Another problem to deal with that has not been mentioned, is that
LRM 9.8(4) suggests that you may have to poll the other processes
in order to determine what tasks to run.
--mike murphy
next reply other threads:[~1991-08-06 18:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
1991-08-06 18:48 Mike Murphy [this message]
-- strict thread matches above, loose matches on Subject: below --
1991-08-16 15:43 Ada and Unix--Blocked Tasks bu.edu!inmet!offer
1991-08-14 15:24 torolab4.vnet.ibm.com!jrussell
1991-08-10 4:59 Robert I. Eachus
1991-08-07 1:35 Bob Kitzberger @midnight
1991-08-06 20:12 mcsun!corton!chorus!nocturne.chorus.fr!jloup
1991-08-06 17:23 David Emery
1991-08-06 14:57 Drew Johnson
1991-08-06 14:32 Dan L. Pierson
1991-08-06 14:17 mcsun!corton!chorus!nocturne.chorus.fr!jloup
1991-08-06 12:32 Arthur Evans
1991-08-06 9:17 Jim Showalter
1991-08-06 4:05 Mike Feldman
1991-08-05 19:56 Howard E. Turner, Jr.
1991-08-05 19:04 EDWARD CRAGG
1991-08-05 16:06 David Emery
1991-08-05 15:25 Fred Stluka
1991-08-05 14:14 Paul Stachour
1991-08-05 5:08 cis.ohio-state.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!news.cs.indiana.e
1991-08-02 18:17 cis.ohio-state.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!cs.u
1991-08-02 13:28 Dennis Doubleday
1991-07-30 19:35 Dave Lewicki
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