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!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!wns14feed!worldnet.att.net!attbi_s71.POSTED!53ab2750!not-for-mail From: "Jeffrey R. Carter" User-Agent: Thunderbird 1.5.0.9 (Windows/20061207) MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ravenscar - program termination References: <87zm81txs1.fsf@ludovic-brenta.org> <1170167084.668967.110840@s48g2000cws.googlegroups.com> <45bf97d4$0$22524$39db0f71@news.song.fi> <45c0499c$0$22512$39db0f71@news.song.fi> <87fy9rty13.fsf@ludovic-brenta.org> In-Reply-To: <87fy9rty13.fsf@ludovic-brenta.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <_Q4wh.329385$FQ1.174442@attbi_s71> NNTP-Posting-Host: 12.201.97.213 X-Complaints-To: abuse@mchsi.com X-Trace: attbi_s71 1170266554 12.201.97.213 (Wed, 31 Jan 2007 18:02:34 GMT) NNTP-Posting-Date: Wed, 31 Jan 2007 18:02:34 GMT Organization: AT&T ASP.att.net Date: Wed, 31 Jan 2007 18:02:34 GMT Xref: g2news2.google.com comp.lang.ada:8778 Date: 2007-01-31T18:02:34+00:00 List-Id: Ludovic Brenta wrote: > > Indeed, one of Ravenscar's goals is to make the necessary kernel easy > to certify to the most stringent safety standards. As with all > high-integrity software, the best way to achieve this is to make > things small and simple. So, not only does Ravenscar avoid the need > to wait for task termination, but also the tasking model (priority > ceiling inheritance) avoids the need for locks completely. Imagine a > tasking kernel with no mutexes :) The assumption is a single processor. We're already moving away from that. -- Jeff Carter "Alms for an ex-leper!" Monty Python's Life of Brian 75