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From: Bill Findlay <yaldnif.w@blueyonder.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Ada advocacy
Date: Tue, 18 Jun 2013 18:43:12 +0100
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Date: 2013-06-18T18:43:12+01:00
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On 18/06/2013 18:15, in article wccvc5b49yc.fsf@shell01.TheWorld.com,
"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote:

> Peter Brooks <peter.h.m.brooks@gmail.com> writes:
> 
>> On Jun 18, 3:28 am, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote:
>>> 
>>> 
>>>         Ada was basically the first LANGUAGE that defined multi-tasking IN
>>> THE
>>> LANGUAGE itself. Before it, one had to use OS specific system calls to
>>> create tasks -- if such a call was even available, in contrast to creating
>>> processes at the command line level.
>>> 
>> The second. Algol68 did.

Not to mention PL/I.

> Others, too.  Per Brinch-Hansen's Concurrent Pascal, for example.  It
> has something-like Ada tasks (no rendezvous; no big loss), and
> something-like Ada protected objects (without barriers -- that's
> a big loss).

Do you mean conditional critical regions?

They did have barriers, but Brinch Hansen and Hoare differed as to whether
they should be anchored at the start, e.g.:

   region V await C do
   ...
   end region;

or should be allowed anywhere inside the region construct:

   region V do
   ...
      await C;
   ...
   end region;

-- 
Bill Findlay
with blueyonder.co.uk;
use  surname & forename;