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 X-Google-Thread: 103376,703c4f68db81387d X-Google-Thread: 109fba,703c4f68db81387d X-Google-Thread: 115aec,703c4f68db81387d X-Google-Attributes: gid103376,gid109fba,gid115aec,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news3.google.com!newshub.sdsu.edu!npeer.de.kpn-eurorings.net!noris.net!newsfeed.arcor.de!news.arcor.de!not-for-mail From: "Dmitry A. Kazakov" Subject: Re: Rendezvous based mutithreading. Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime User-Agent: 40tude_Dialog/2.0.14.1 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Reply-To: mailbox@dmitry-kazakov.de Organization: cbb software GmbH References: <4229bad9$0$1019$afc38c87@news.optusnet.com.au> <1110032222.447846.167060@g14g2000cwa.googlegroups.com> <871xau9nlh.fsf@insalien.org> <3SjWd.103128$Vf.3969241@news000.worldonline.dk> <87r7iu85lf.fsf@insalien.org> <1110052142.832650@athnrd02> <1110284070.410136.205090@o13g2000cwo.googlegroups.com> <395uqaF5rhu2mU1@individual.net> <1111607633.301232.62490@z14g2000cwz.googlegroups.com> <4241e04c$0$11471$9b4e6d93@newsread2.arcor-online.net> <1111614619.83944@athnrd02> <3895971.bl8ACDBTNI@linux1.krischik.com> <1111721265.519102@athnrd02> <1776861.Inq2IMonX4@linux1.krischik.com> <1v77bmpharzqc.xdxzsi8p3kwi$.dlg@40tude.net> <2919578.tRXogVExfE@linux1.krischik.com> Date: Sat, 26 Mar 2005 08:14:18 +0100 Message-ID: NNTP-Posting-Date: 26 Mar 2005 08:14:12 MET NNTP-Posting-Host: 1a2521ec.newsread2.arcor-online.net X-Trace: DXC=h9Ci60GN=_0MXCiXZcgNO?Q5U85hF6f;4jW\KbG]kaM8]kI_X=5Kea64kXhVRfXV37[6LHn;2LCV>VVa[ZlQni_1h6[cbfe=ME4 X-Complaints-To: abuse@arcor.de Xref: g2news1.google.com comp.lang.ada:10015 comp.lang.c++:47318 comp.realtime:1736 Date: 2005-03-26T08:14:12+01:00 List-Id: On Fri, 25 Mar 2005 19:21:18 +0100, Martin Krischik wrote: > Dmitry A. Kazakov wrote: > >> On Fri, 25 Mar 2005 13:42:31 +0100, Martin Krischik wrote: >> >>> But I think it would be quite a challenge to create rendezvous based >>> multithreading on top of C++ templates - and yet keep it easy to use for >>> the programmer. >> >> We did it in our proprietary C++ library, and without any templates, BTW. >> The pattern is: >> >> 1. A rendezvous queue type either to derive task objects from or to >> mix-in. A task periodically polls the queue, it can also wait for a >> queuing event. >> >> 2. An abstract rendezvous object type to queue. User-defined rendezvous >> objects were derived from there. When rendezvous happened a virtual method >> was called. >> >> We supported timed calls, and even a kind of re-queuing to mimic this >> extremely useful feature of Ada 95. >> >> Of course it is not as easy to use it as Ada's rendezvous, but it is >> usable and works fine. The advantages rendezvous have over queues are that >> as in Ada there is no need to marshal parameters here and there, no need >> in any locks, no problem to have results. >> >> The most difficult problem is exception handling. In Ada, rendezvous >> exceptions are propagated in both caller and callee. This is impossible to >> mimic in C++, because there seems no way to throw same-as-this exception >> in C++. So we had to fuse all exceptions on the caller's side ... > > Cool. Sad that it is not open source. There is Ada for that! -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de