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-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,ce6f6f23c4e880ad X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-06-24 08:14:52 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed1.cidera.com!Cidera!cyclone.socal.rr.com!cyclone3.kc.rr.com!news3.kc.rr.com!twister.socal.rr.com.POSTED!not-for-mail Message-ID: <3D173788.8758A005@san.rr.com> From: Darren New X-Mailer: Mozilla 4.77 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Multitasking theory question References: <3d123f34.0@news.unibw-muenchen.de> <3D128BA9.8090707@telepath.com> <3D16B14B.2A5D8261@attbi.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Mon, 24 Jun 2002 15:14:52 GMT NNTP-Posting-Host: 66.75.151.160 X-Complaints-To: abuse@rr.com X-Trace: twister.socal.rr.com 1024931692 66.75.151.160 (Mon, 24 Jun 2002 08:14:52 PDT) NNTP-Posting-Date: Mon, 24 Jun 2002 08:14:52 PDT Organization: RoadRunner - West Xref: archiver1.google.com comp.lang.ada:26656 Date: 2002-06-24T15:14:52+00:00 List-Id: AG wrote: > However, what I was driving at is a sort of a virtual machine: > - *assuming* it runs at all, and lets you do some basic things > like Turing machine, where does an OS come into it? The places where a machine isn't a turing machine. I.e., Input/Output. > Sure, it > may take ages for anything to happen if the computer is sufficiently > slow but you still can implement whatever scheduling you like. Uh, no. If you have a 3rd party device driver that blocks, then you can't do non-blocking I/O to that device, regardless of what cleverness you set up in your part of the program. -- Darren New San Diego, CA, USA (PST). Cryptokeys on demand. ** http://home.san.rr.com/dnew/DNResume.html ** ** http://images.fbrtech.com/dnew/ ** My brain needs a "back" button so I can remember where I left my coffee mug.