From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on ip-172-31-74-118.ec2.internal X-Spam-Level: X-Spam-Status: No, score=-0.5 required=3.0 tests=BAYES_05 autolearn=ham autolearn_force=no version=3.4.5-pre1 Path: eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail From: Paul Rubin Newsgroups: comp.lang.ada Subject: Re: is there a version of unix written in Ada Date: Tue, 29 Sep 2020 16:54:16 -0700 Organization: A noiseless patient Spider Message-ID: <87sgb02l7b.fsf@nightsong.com> References: <00cd3aaa-d518-43a2-b321-58d6fae70aebo@googlegroups.com> <57eb7a65-51ea-4624-b9dc-9c4dda0fee59n@googlegroups.com> <5f70fd3b$0$13541$426a74cc@news.free.fr> <87wo0d3iac.fsf@nightsong.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: reader02.eternal-september.org; posting-host="b17e81130bee1119d242b7f010dedd5c"; logging-data="13211"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX199c1DnhdNKtnipaw1tUFQe" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) Cancel-Lock: sha1:gFSSCF+gX8JPbiP5Ea4AKMvT42s= sha1:bll1ujAd6TYGRcxtAhl94aSzG2E= Xref: reader02.eternal-september.org comp.lang.ada:60329 List-Id: "Dmitry A. Kazakov" writes: >> Do you remember the Microsoft Singularity research OS? Does it count? > What is novel in there? The idea to reduce OS down to nothing is > neither new nor productive, IMO. One interesting thing was that it got rid of the need for address translation hardware by implementing interprocess memory protection with compile-time static analysis. That made IPC a lot faster and changed the trade-offs for different concurrency approaches.