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=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,7d5642dc1158588b
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news2.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!t-online.de!130.59.10.21.MISMATCH!kanaga.switch.ch!news-zh.switch.ch!switch.ch!cernne03.cern.ch!not-for-mail
From: Maciej Sobczak <no.spam@no.spam.com>
Newsgroups: comp.lang.ada
Subject: Re: Ravenscar - program termination
Date: Wed, 31 Jan 2007 10:01:55 +0100
Organization: CERN News
Message-ID: <epplu3$lk2$1@cernne03.cern.ch>
References: <epl7mp$tls$1@cernne03.cern.ch>
 <87zm81txs1.fsf@ludovic-brenta.org> <epmuf7$ihm$1@cernne03.cern.ch>
 <o4ac00dfe7.fsf@hod.lan.m-e-leypold.de>
NNTP-Posting-Host: abpc10883.cern.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: cernne03.cern.ch 1170234115 22146 137.138.37.241 (31 Jan 2007
 09:01:55 GMT)
X-Complaints-To: news@@cern.ch
NNTP-Posting-Date: Wed, 31 Jan 2007 09:01:55 +0000 (UTC)
User-Agent: Thunderbird 1.5.0.9 (X11/20061220)
In-Reply-To: <o4ac00dfe7.fsf@hod.lan.m-e-leypold.de>
Xref: g2news2.google.com comp.lang.ada:8762
Date: 2007-01-31T10:01:55+01:00
List-Id: <comp.lang.ada>

Markus E Leypold wrote:

>> Still, it looks like I cannot say:
>>
>> pragma Profile(Ravenscar);
>>
>> in my Hello World program even though this program meets the
>> objectives of the profile. That's not fair! :-)
> 
> Well, it terminates. What does termination mean in a "high integrity"
> embedded system

And who said that Ravenscar is for embedded systems *only*?
The word "embedded" does not even appear in the document, apart from the 
example in chapter 7 (which as an example is not normative).

I wrote a Hello World program and I want to impress my boss telling him 
that my program complies with Ravenscar recommendations. That sounds 
much more serious than a plain dumb Hello World program!

I've found a way:

with Ada.Text_IO;
procedure Hello is
begin
    Ada.Text_IO.Put_Line("Hello Ravenscar!");
    loop
       null;
    end loop;
end Hello;

Wow! ;-)
But the CPU is spinning like crazy.


OK, back to serious mode.
One of the Ravenscar objectives is to allow implementations to provide 
stripped-down runtime when the profile is requested. This is a nice 
feature, even for programs that are not safety-critical in nature.
How does GNAT handle this? Can I expect it to build smaller (faster?) 
executables when I say pragma Profile(Ravenscar) provided that the 
program complies to all the restrictions anyway?

-- 
Maciej Sobczak : http://www.msobczak.com/
Programming    : http://www.msobczak.com/prog/