From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: SPARK 2014 and protected objects
Date: Wed, 31 Aug 2016 08:42:49 +0100
Organization: A noiseless patient Spider
Message-ID: <ly8tvdidty.fsf@pushface.org>
References: <ly1t16k0kk.fsf@pushface.org>
	<2a104643-59b9-4a46-b543-5c124984bf43@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx02.eternal-september.org;
 posting-host="90a7515de723fda2443060f3e878f4b0";
	logging-data="8253"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX186lpsBG8yl/CfxLLT/Hco1z8ALkobTy+U="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin)
Cancel-Lock: sha1:JcjgrPKsbXleYN1Qlq/ZN2cKp7U=
	sha1:/ySjVGRXkEAjDOMhnOsxombrScc=
Xref: news.eternal-september.org comp.lang.ada:31653
Date: 2016-08-31T08:42:49+01:00
List-Id: <comp.lang.ada>

Shark8 <onewingedshark@gmail.com> writes:

>    protected Impl
>      with Part_Of => State
>    is
>       procedure Set (Value : Integer)
>         with Depends => ((Impl =>+ Value));
>       procedure Get (Value : out Integer)
>         with Depends => (Impl => Impl, Value => Impl);
>
>    private
> 	Protected_Value : Integer := 0;
>    end Impl;
>     
>     -- GNAT doesn't allow Volatile on the protected object's with.
>     Pragma Volatile(Impl);

We seem to have come up with (almost) the same solution, which gives me
confidence it's the right one. Thanks.

I had Protected_Value outside the PO because it's standing in for a
number of I/O registers communicating with devices on a shared SPI bus
via their /Chip Select lines. Not sure how to deal with the concept of
"a number of machine registers"!