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!mx02.eternal-september.org!.POSTED!not-for-mail From: "J-P. Rosen" Newsgroups: comp.lang.ada Subject: Re: confusion about message passing between the tasks Date: Mon, 27 Oct 2014 08:51:30 +0100 Organization: A noiseless patient Spider Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Injection-Date: Mon, 27 Oct 2014 07:51:56 +0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="214e2226c9a2cb4f71713357be0d6925"; logging-data="31035"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18QfO/Ii7fVCidz2Y/Y3s3y" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 In-Reply-To: Cancel-Lock: sha1:+0gM8sKw/vrQaHsdw0dol8HPS+s= Xref: news.eternal-september.org comp.lang.ada:22807 Date: 2014-10-27T08:51:30+01:00 List-Id: Le 27/10/2014 01:46, Robert A Duff a écrit : > That might seem like a nitpick, but imagine the thing (PO or task) > alternates between the two states, and clients depend on that fact. > In the passive-task case, we have this weird in-between state in > which neither entry is open. And that's unlikely to be caught > by testing, because it's rare. In the PO case, we know for sure that > if the above conditional entry call finds Entry_1 closed, then Entry_2 > must be open (at that time). However, Entry_2 can close any time between the test of Entry_1 and whatever you want to do with that information. So it seems to me that it's a red herring... -- J-P. Rosen Adalog 2 rue du Docteur Lombard, 92441 Issy-les-Moulineaux CEDEX Tel: +33 1 45 29 21 52, Fax: +33 1 45 29 25 00 http://www.adalog.fr