From: micronian2@gmail.com
Subject: Re: Quick Protected Object question
Date: Tue, 9 Dec 2008 11:59:54 -0800 (PST)
Date: 2008-12-09T11:59:54-08:00 [thread overview]
Message-ID: <c800881b-0e32-4787-b7ed-1e014e0c6b6c@c36g2000prc.googlegroups.com> (raw)
In-Reply-To: b16380cc-7f76-4827-bb4d-544863c5555e@w1g2000prk.googlegroups.com
On Dec 8, 5:43 am, Ludovic Brenta <ludo...@ludovic-brenta.org> wrote:
> On Dec 8, 2:34 pm, markp <markwor...@yahoo.com> wrote:
>
>
>
> > I have a very quick protected object question. In a standard proected
> > object setup as follows:
>
> > protected Test is
> > procedure A;
> > procedure B;
> > private
> > Z : integer := 0;
> > end Test;
>
> > protected body Test is
> > procedure A is
> > begin
> > < set of statements>
> > end A;
>
> > procedure B is
> > begin
> > < set of statements>
> > end B;
> > end Test;
>
> > The question is this: when procedure A is called, are all threads that
> > try to call B suspended until A finishes or, do the threads that call
> > B execute as long as A is not touching the private data "Z". Is the
> > lock at the procedure level or only at the data level?
>
> At the procedure level; see ARM 9.5.1 athttp://www.adaic.com/standards/05rm/html/RM-9-5-1.html
>
> --
> Ludovic Brenta.
Hi,
In addition to the reference that Ludovic provided, here is a link
that describes the Eggshell model that is used for protected objects:
http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/node25.htm
--Micronian Coder
prev parent reply other threads:[~2008-12-09 19:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-08 13:34 Quick Protected Object question markp
2008-12-08 13:43 ` Ludovic Brenta
2008-12-09 19:59 ` micronian2 [this message]
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