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 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Musings on RxAda Date: Wed, 21 Oct 2015 18:47:35 +0200 Organization: cbb software GmbH Message-ID: <18xpt5oxiz5nw$.klh515586pjp.dlg@40tude.net> References: <75f38e30-42ba-4e98-8f36-2218b5167209@googlegroups.com> <1wvo1b25eaa4o$.1y03vu1to6vux$.dlg@40tude.net> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: j6IQVb9uobzjXrpQLDU2rQ.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:28014 Date: 2015-10-21T18:47:35+02:00 List-Id: On Wed, 21 Oct 2015 09:18:12 -0700 (PDT), Hadrien Grasland wrote: > I do believe, however, that a task which blocks or performs CPU work after > the rendezvous is acceptable, But it is still blocking. For a publisher/subscriber service no mediator task is needed. Such a task would not solve any of the problems of such service anyway. > and could be used to achieve some > parallelism in the context of a true data pipeline (i.e. more than 1 > input). Pipeline is just a method of buffered exchange. As such it is blocking (publisher) when the subscriber is unable to process all published data. Moreover it is unsuitable for 1-n communications. If you are OK with blocking the publisher, then no buffering is ever needed. Buffering (marshaling) is required by non-blocking but not ensures it. And no mediator task is needed anyway, not even a protected object. 1-1 FIFO requires none of Ada's synchronization primitives. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de