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=-0.3 required=5.0 tests=BAYES_00, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,abd508cccb4803ea X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-06-22 06:36:56 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.uchicago.edu!yellow.newsread.com!netaxs.com!newsread.com!netnews.com!xfer02.netnews.com!newsfeed1.cidera.com!Cidera!cyclone2.gnilink.net!cyclone1.gnilink.net!wn3feed!worldnet.att.net!bgtnsc04-news.ops.worldnet.att.net.POSTED!not-for-mail Reply-To: "Jack Flynn" From: "Jack Flynn" Newsgroups: comp.lang.ada References: <3D0E09BA.A492AA3D@despammed.com> <5ee5b646.0206210355.3533be8f@posting.google.com> <3D1390D0.7040709@attbi.com> <5ee5b646.0206220514.55f8cf9a@posting.google.com> Subject: Re: C.A.R. Hoare on liability X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Message-ID: Date: Sat, 22 Jun 2002 13:36:56 GMT NNTP-Posting-Host: 12.80.1.57 X-Complaints-To: abuse@worldnet.att.net X-Trace: bgtnsc04-news.ops.worldnet.att.net 1024753016 12.80.1.57 (Sat, 22 Jun 2002 13:36:56 GMT) NNTP-Posting-Date: Sat, 22 Jun 2002 13:36:56 GMT Organization: AT&T Worldnet Xref: archiver1.google.com comp.lang.ada:26599 Date: 2002-06-22T13:36:56+00:00 List-Id: "Robert Dewar" wrote in message news:5ee5b646.0206220514.55f8cf9a@posting.google.com... > > My understanding of the Ariane case is that this check was casually put in, > in other words it was put in WITHOUT any analysis that said this check was > needed. Deployed code should not have such checks. > In the Ariane IV case, analysis was done to convince themselves that they did not have a "generic software fault". The checks were to trap faulty hardware and get a failed channel offline to prevent actuator force fights or other interference with the unfailed channel.