From: Ted Dennison<dennison@telepath.com>
Subject: Re: Ada to C++ translator?
Date: Fri, 16 Feb 2001 15:20:16 GMT
Date: 2001-02-16T15:20:16+00:00 [thread overview]
Message-ID: <Qybj6.354$a4.1745@www.newsranger.com> (raw)
In-Reply-To: 3A8C6AA3.3F90043D@lmco.com
In article <3A8C6AA3.3F90043D@lmco.com>, Robert Brantley says...
>They didn't use the Ada tasking manager when they originally developed the
>code, apparently because it was to slow.
Heh. Not likely. Ada tasking execs generally fall into one of two categories:
1) Uses the OS "threading" capabilities.
In this case, it will be pretty much *exactly* the same speed in task
switching as the OS. The main difference is that the Ada tasking exec is
debugged already, while a custom one you make you will have to debug
yourself.
2) Uses its own tasking code within a single OS process/thread.
This is usually significantly *faster* that OS threads, since it generally
doesn't incur a lot of system call overhead, as well as overhead for all
the extra fancy features an OS process/thread scheduler has to support.
More likely is that they didn't use Ada tasking becuase they needed real-time
performance, and Ada83 didn't support real-time tasking very well (it lacked the
"delay until" feature).
Its a shame you can't just rewite the Ada83 code in Ada95 instead of C++. It is
actually possible to write a *portable* real-time scheduler in Ada95 (no OS
calls whatsoever). The project I'm working on has actually done this. With C++
you are going to have to go through this same painful porting effort every time
you switch platforms. I don't envy you at all.
---
T.E.D. homepage - http://www.telepath.com/dennison/Ted/TED.html
home email - mailto:dennison@telepath.com
next prev parent reply other threads:[~2001-02-16 15:20 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-09 19:17 Ada to C++ translator? Robert Brantley
2001-02-09 20:48 ` Britt Snodgrass
2001-02-09 23:35 ` Jeffrey Carter
2001-02-09 23:47 ` Brian Rogoff
2001-02-12 15:07 ` Ted Dennison
2001-02-12 15:49 ` Brian Rogoff
2001-02-13 19:36 ` Ted Dennison
2001-02-12 20:25 ` David C. Hoos, Sr.
2001-02-11 10:36 ` Gautier
2001-02-11 11:15 ` Pascal Obry
2001-02-11 11:15 ` Jean-Pierre Rosen
2001-02-12 10:36 ` David C. Hoos, Sr.
2001-02-11 13:15 ` Larry Kilgallen
2001-02-11 14:50 ` Ken Garlington
2001-02-11 15:58 ` Florian Weimer
2001-02-11 17:05 ` Aaro Koskinen
2001-02-15 23:47 ` Robert Brantley
2001-02-16 15:20 ` Ted Dennison [this message]
[not found] ` <cyik6.1725$DE.61421700@newssvr10-int.news.prodigy.com>
[not found] ` <%Wvk6.102$aw5.380@www.newsranger.com>
2001-02-21 0:33 ` Ken Garlington
2001-02-21 10:54 ` Ole-Hjalmar Kristensen
2001-02-21 12:40 ` Ken Garlington
2001-02-21 12:56 ` Ole-Hjalmar Kristensen
2001-02-21 18:36 ` Brian Rogoff
2001-02-21 19:05 ` Marin David Condic
2001-02-21 21:26 ` Simon Wright
2001-02-23 21:05 ` Marin David Condic
2001-02-24 8:38 ` Simon Wright
2001-02-24 16:22 ` Nick Williams
2001-02-24 19:22 ` Marin David Condic
2001-02-24 19:38 ` Ken Garlington
2001-02-25 15:21 ` Marin David Condic
2001-02-12 15:33 ` Ted Dennison
2001-02-12 22:34 ` UML (Was: Ada to C++ translator?) Frode Tennebø
2001-02-14 4:48 ` Ken Garlington
2001-02-14 6:19 ` Ray Blaak
2001-02-14 20:38 ` Nick Williams
2001-02-15 7:57 ` Ray Blaak
2001-02-15 11:14 ` Pierre Dissaux
2001-02-15 23:37 ` Ada to C++ translator? Robert Brantley
2001-02-16 0:34 ` tmoran
2001-02-16 4:59 ` Lao Xiao Hai
2001-02-16 15:20 ` Marin David Condic
2001-02-16 11:02 ` Tarjei T. Jensen
2001-02-16 13:34 ` Ken Garlington
2001-02-16 14:55 ` Marin David Condic
2001-02-16 21:04 ` tmoran
2001-02-16 15:44 ` Ted Dennison
2001-02-21 13:21 ` Bob Jacobs
2001-02-21 14:14 ` Ted Dennison
2001-02-21 14:59 ` Bob Jacobs
2001-02-21 15:58 ` Martin Dowie
2001-02-21 16:15 ` Bob Jacobs
2001-02-21 16:57 ` Ted Dennison
2001-02-22 1:39 ` Andrew Berg
2001-02-22 9:47 ` STL for Ada (was: Re: Ada to C++ translator?) Stefan Nobis
2001-02-22 15:20 ` Lutz Donnerhacke
2001-02-22 15:30 ` Ted Dennison
2001-02-22 17:55 ` Brian Rogoff
2001-02-22 9:09 ` Ada to C++ translator? Martin Dowie
2001-02-22 13:32 ` Bob Jacobs
2001-02-22 14:30 ` Ted Dennison
2001-02-22 9:17 ` Martin Dowie
2001-02-15 23:09 ` Robert Brantley
-- strict thread matches above, loose matches on Subject: below --
2001-02-22 10:40 gautier
2001-02-22 9:24 gautier
2001-02-22 10:21 ` Martin Dowie
2001-02-21 15:44 gautier
1998-02-04 0:00 Ada to C translator ? Stewart French
1998-02-05 0:00 ` Gautier
1994-11-16 13:10 Eric Labbe
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