From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Multitasking and containers
Date: Fri, 24 Nov 2006 11:19:23 +0100
Date: 2006-11-24T11:19:23+01:00 [thread overview]
Message-ID: <b62ajtddi0xt.5azckp3k6y3u.dlg@40tude.net> (raw)
In-Reply-To: ek6bqd$prc$1@cernne03.cern.ch
On Fri, 24 Nov 2006 09:51:24 +0100, Maciej Sobczak wrote:
> Paragraph 3 in Annex A says that it's OK to call any standard subprogram
> from concurrent tasks as long as the parameters do not overlap. John
> Barnes ("Progamming in Ada 2005") suggests that in order to (for
> example) read from the same container, the operations need to be
> protected "by using the normal techniques such as protected objects".
>
> But reading from the protected object is not mutually exclusive (many
> readers are allowed) - so where's the gain? What's the difference
> between concurrent reads of, say, a Vector via protected object vs.
> direct access?
I think he didn't mean container being a protected object. It would be
difficult to do, because protected types alas aren't tagged. So I read it
as "by using a locking/serialization technique, such as mutex, which can be
implemented as a protected object."
[ I don't know if ARM 2005 permits mutable implementations of read
operations on the containers. I suppose it does, so the need to lock upon
read. ]
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2006-11-24 10:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-24 8:51 Multitasking and containers Maciej Sobczak
2006-11-24 10:11 ` Georg Bauhaus
2006-11-24 10:19 ` Dmitry A. Kazakov [this message]
2006-11-24 10:35 ` Maciej Sobczak
2006-11-24 11:14 ` Dmitry A. Kazakov
2006-11-24 12:13 ` Matthew Heaney
2006-11-27 4:17 ` Jeffrey R. Carter
2006-11-27 10:30 ` Georg Bauhaus
2006-11-27 18:41 ` Jeffrey R. Carter
2006-11-27 18:57 ` Dmitry A. Kazakov
2006-11-27 19:45 ` Matthew Heaney
2006-11-27 21:15 ` Simon Wright
2006-11-28 1:43 ` Dr. Adrian Wrigley
2006-11-28 2:19 ` Matthew Heaney
2006-11-28 8:50 ` Dmitry A. Kazakov
2006-11-28 10:31 ` Georg Bauhaus
2006-11-28 11:24 ` Dmitry A. Kazakov
2006-11-29 8:51 ` Georg Bauhaus
2006-11-28 17:12 ` Matthew Heaney
2006-11-28 18:21 ` Dmitry A. Kazakov
2006-11-28 19:17 ` Matthew Heaney
2006-11-29 18:43 ` Dmitry A. Kazakov
2006-11-29 10:14 ` Maciej Sobczak
2006-11-29 15:50 ` Matthew Heaney
2006-11-24 12:12 ` Matthew Heaney
2006-11-24 12:05 ` Matthew Heaney
2006-11-24 12:02 ` Matthew Heaney
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