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: 103376,98dd0f70b14ccb75 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-07-31 12:27:36 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news.uchicago.edu!newsfeed.cs.wisc.edu!newsfeed.mathworks.com!kibo.news.demon.net!news.demon.co.uk!demon!not-for-mail From: Simon Wright Newsgroups: comp.lang.ada Subject: Re: Linux Calls Date: 31 Jul 2003 20:26:17 +0100 Organization: Pushface Sender: simon@smaug.pushface.org Message-ID: References: NNTP-Posting-Host: pogner.demon.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: news.demon.co.uk 1059679655 28218 62.49.19.209 (31 Jul 2003 19:27:35 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Thu, 31 Jul 2003 19:27:35 +0000 (UTC) User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 Xref: archiver1.google.com comp.lang.ada:41101 Date: 2003-07-31T20:26:17+01:00 List-Id: "Jeremy Smith" writes: > I have two tasks, built using gnat 3.13p, running under Linux, Red Hat 8. > The idea was to have one task processing and performing cyclic tasks > continuously while the other task waits for commands and responds to them > right away. To accomplish this I am want to run the command receipt task at > a higher priority than the continuous processing task. My problem is that > the commands are coming over an IPC message queue, so when the command > receipt task calls msgget (visible via pragma Import) it blocks but does it > outside the Ada RTS. The continuous processing task never gains context > because the Ada RTS doesn't know the command receipt task has blocked > pending receipt of the next command. > > Anybody know a way to wrap a blocking OS call so that the other lower > priority Ada tasks can play until it returns? It sounds as though you're using the "fsu" version of the runtime system - you need the version that uses native threads. On recent editions of GNAT, & I'm pretty sure on 3.13p, you get a choice between fsu & native; check out the installation instructions. (as far as I can remember, it involves switching the symlinks for adainclude, adalib in ...lib/gcc-lib/i686-pc-linux-gnu/2.8.1/ . The binary I have is called gnat-3.13p-i686-pc-linux-gnu-bin.tar.gz