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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Quick Protected Object question
Date: Mon, 8 Dec 2008 05:43:37 -0800 (PST)
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Date: 2008-12-08T05:43:37-08:00
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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 at http://www.adaic.com/standards/05rm/html/RM-9-5-1.html

--
Ludovic Brenta.