From: "Alex R. Mosteo" <devnull@mailinator.com>
Subject: Re: Robert Dewar's great article about the Strengths of Ada over other langauges in multiprocessing!
Date: Fri, 14 Mar 2008 11:16:09 +0100
Date: 2008-03-14T11:16:09+01:00 [thread overview]
Message-ID: <63v1jgF283nutU1@mid.individual.net> (raw)
In-Reply-To: frcjef$re0$1@jacob-sparre.dk
Randy Brukardt wrote:
> "Alex R. Mosteo" <devnull@mailinator.com> wrote in message
> news:63sn1tF29a5oiU1@mid.individual.net...
> ...
>> Although in Ada I don't see much (or any?) use for volatile, non-atomic
> shared
>> variables outside of protected objects.
>>
>> Some flaw in my understanding?
>
> Yes, sort of. You're not considering non-tasking uses. The canonical example
> for Volatile is reading/writing a memory-mapped hardware device. In that
> case, optimizing out the reads/writes can be fatal. It doesn't directly have
> anything to do with tasking. (I suppose one could consider the hardware
> device as a sort of task, but it would be done with unusual properties.)
Ah, of course. I was so bent on looking for strange uses that I missed the
obvious one.
> Another purpose is for debugging. You can monitor the memory location of a
> Volatile object to see what is going on, without the pragma the compiler can
> optimize the entire object away leaving nothing to monitor. (Of course, the
> pragma also changes the code, which might change the bug you are trying to
> find.)
Hehe. Happily I only need the debugger once in a trimester or so :)
> (...)
Thanks!
next prev parent reply other threads:[~2008-03-14 10:16 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-08 6:04 Robert Dewar's great article about the Strengths of Ada over other langauges in multiprocessing! ME
2008-03-08 22:11 ` Maciej Sobczak
2008-03-09 1:09 ` Christopher Henrich
2008-03-09 13:52 ` Maciej Sobczak
2008-03-09 1:51 ` Phaedrus
2008-03-09 3:17 ` Jeffrey R. Carter
2008-03-09 13:59 ` Maciej Sobczak
2008-03-09 3:15 ` Jeffrey R. Carter
2008-03-09 13:32 ` Maciej Sobczak
2008-03-09 14:02 ` Dmitry A. Kazakov
2008-03-09 18:26 ` Phaedrus
2008-03-10 0:04 ` Ray Blaak
2008-03-10 7:49 ` Georg Bauhaus
2008-03-10 16:48 ` Ray Blaak
2008-03-10 7:53 ` Phaedrus
2008-03-09 22:31 ` Jeffrey R. Carter
2008-03-10 3:53 ` gpriv
2008-03-10 3:04 ` Robert Dewar's great article about the Strengths of Ada over Larry Kilgallen
2008-03-10 9:23 ` Maciej Sobczak
2008-03-10 19:01 ` Jeffrey R. Carter
2008-03-10 22:00 ` Maciej Sobczak
2008-03-11 0:48 ` Jeffrey R. Carter
2008-03-11 7:12 ` Pascal Obry
2008-03-11 8:59 ` Maciej Sobczak
2008-03-11 9:49 ` GNAT bug, Assert_Failure at atree.adb:2893 Ludovic Brenta
2008-03-14 20:03 ` Robert Dewar's great article about the Strengths of Ada over Ivan Levashew
2008-03-22 21:12 ` Florian Weimer
2008-03-09 8:20 ` Robert Dewar's great article about the Strengths of Ada over other langauges in multiprocessing! Pascal Obry
2008-03-09 9:39 ` Georg Bauhaus
2008-03-09 12:40 ` Vadim Godunko
2008-03-09 13:37 ` Dmitry A. Kazakov
2008-03-09 14:41 ` Vadim Godunko
2008-03-10 20:51 ` Randy Brukardt
2008-03-10 22:30 ` Niklas Holsti
2008-03-10 9:56 ` Ole-Hjalmar Kristensen
2008-03-11 13:58 ` george.priv
2008-03-11 15:41 ` Vadim Godunko
2008-03-12 0:32 ` gpriv
2008-03-12 13:33 ` Maciej Sobczak
2008-03-12 14:41 ` gpriv
2008-03-12 15:22 ` Vadim Godunko
2008-03-13 0:34 ` gpriv
2008-03-12 16:28 ` Maciej Sobczak
2008-03-12 17:24 ` Samuel Tardieu
2008-03-13 8:41 ` Maciej Sobczak
2008-03-13 15:20 ` Samuel Tardieu
2008-03-12 23:54 ` gpriv
2008-03-13 9:40 ` Maciej Sobczak
2008-03-13 10:49 ` Peter C. Chapin
2008-03-13 13:03 ` Alex R. Mosteo
2008-03-13 14:02 ` gpriv
2008-03-14 1:12 ` Randy Brukardt
2008-03-14 10:16 ` Alex R. Mosteo [this message]
2008-03-13 11:42 ` gpriv
2008-03-13 16:10 ` Maciej Sobczak
2008-03-13 16:16 ` gpriv
2008-03-13 22:01 ` Simon Wright
2008-03-13 22:25 ` Maciej Sobczak
2008-03-14 2:07 ` gpriv
2008-03-14 9:29 ` Maciej Sobczak
2008-03-14 21:54 ` Simon Wright
2008-03-15 2:29 ` gpriv
2008-03-15 13:29 ` Maciej Sobczak
2008-03-15 16:09 ` gpriv
2008-03-11 22:09 ` gpriv
2008-03-09 13:50 ` Maciej Sobczak
2008-03-09 14:54 ` Pascal Obry
2008-03-10 21:24 ` Randy Brukardt
2008-03-11 10:12 ` Alex R. Mosteo
2008-03-22 22:43 ` Florian Weimer
2008-03-26 13:49 ` Ole-Hjalmar Kristensen
2008-03-26 21:27 ` Florian Weimer
2008-03-27 9:31 ` Ole-Hjalmar Kristensen
2008-03-27 23:10 ` Florian Weimer
2008-03-28 9:51 ` Ole-Hjalmar Kristensen
2008-03-28 18:12 ` Florian Weimer
2008-03-28 21:45 ` Randy Brukardt
2008-03-31 7:59 ` Ole-Hjalmar Kristensen
2008-03-31 13:03 ` (see below)
2008-03-31 14:17 ` (see below)
2008-04-01 9:02 ` Ole-Hjalmar Kristensen
2008-04-01 14:12 ` (see below)
2008-04-02 7:22 ` Ole-Hjalmar Kristensen
2008-04-02 14:59 ` (see below)
2008-04-04 6:36 ` Ole-Hjalmar Kristensen
2008-04-04 13:56 ` (see below)
2008-04-04 17:36 ` Georg Bauhaus
2008-04-04 17:40 ` (see below)
2008-04-15 12:05 ` Ole-Hjalmar Kristensen
2008-04-17 4:46 ` Randy Brukardt
2008-03-28 6:34 ` Randy Brukardt
2008-04-29 7:15 ` Ivan Levashew
2008-05-01 2:03 ` Steve Whalen
2008-03-14 19:20 ` Mike Silva
2008-03-14 20:43 ` Ed Falis
2008-03-22 22:51 ` Florian Weimer
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