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=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: multiple delay alternative Date: Tue, 6 Mar 2018 16:17:11 +0100 Organization: Aioe.org NNTP Server Message-ID: References: <90838aa0-bd51-4913-b0cf-1ded5024c151@googlegroups.com> <212bf1a1-1bcc-4474-b1f6-b98c1461ff07@googlegroups.com> NNTP-Posting-Host: MyFhHs417jM9AgzRpXn7yg.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 Content-Language: en-US X-Notice: Filtered by postfilter v. 0.8.3 Xref: reader02.eternal-september.org comp.lang.ada:50846 Date: 2018-03-06T16:17:11+01:00 List-Id: On 06/03/2018 14:43, Mehdi Saada wrote: >> The difference is that execution of the body of a protected function/procedure/entry is logically instant. Therefore a protected function or > procedure logically never waits = never blocked. >> Functions are like procedures except that logically allowed to run parallel to each other. Ok, but aren't calls on protected procedures blocked when other tasks is executing them ? > And, hum, I don't understand of "logically" stuff, I would like to stick with practical cases for the moment... Logically = in the sense of program logic. A practical case is when you looping in a protected body when other tasks try to insert or read something into/from a shared container object, totally unrelated to the said body. If the implementation of exclusion is based on taking a process-wide spin lock, the body would block all container operations, while the program logic would view these container operations non-blocking. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de