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,fd0ee7c9be011576 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-03-06 22:58:08 PST Path: supernews.google.com!sn-xit-03!supernews.com!news-feed.riddles.org.uk!newsfeed.direct.ca!look.ca!newsfeed1.earthlink.net!newsfeed.earthlink.net!newsmaster1.prod.itd.earthlink.net!newsread2.prod.itd.earthlink.net.POSTED!not-for-mail Message-ID: <3AA5DB24.9270F510@acm.org> From: Jeffrey Carter X-Mailer: Mozilla 4.7 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ada Annex E (Just curious :-) References: <3AA29386.E60A686D@linuxchip.demon.co.uk> <980ekl$p4h$1@nh.pace.co.uk> <3AA43C58.105B970D@linuxchip.demon.co.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Wed, 07 Mar 2001 06:54:42 GMT NNTP-Posting-Host: 158.252.147.24 X-Complaints-To: abuse@earthlink.net X-Trace: newsread2.prod.itd.earthlink.net 983948082 158.252.147.24 (Tue, 06 Mar 2001 22:54:42 PST) NNTP-Posting-Date: Tue, 06 Mar 2001 22:54:42 PST Organization: EarthLink Inc. -- http://www.EarthLink.net Xref: supernews.google.com comp.lang.ada:5492 Date: 2001-03-07T06:54:42+00:00 List-Id: Ted Dennison wrote: > > Admittedly, I don't know all that much about Annex E. But in this situation, why > wouldn't you prefer to have direct compiler support for putting tasks on > different processors, rather than mess with Annex E? The Harris Nighthawk > (Ada83) compiler worked that way (and was quite nice for hard-realtime). Ada > 95's protected types seem tailor-made for this kind of setup. I'd think Annex E > would be more suited to a situation where you have multiple processors that > share *no* memory and must communicate through I/O. One can argue that Annex E is completely superfluous. One could have a compiler that targeted a distributed system, and converted all intertask communications (rendezvous and protected operations) into network messages. A program for a distributed system could look exactly like a program for a multiprocessor, which would make porting from one to the other much simpler. -- Jeff Carter "Son of a window-dresser." Monty Python & the Holy Grail