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: 103376,8a3e2ce4e6d56336 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-03-08 20:28:04 PST Path: supernews.google.com!sn-xit-03!supernews.com!freenix!sunqbc.risq.qc.ca!newsfeed.mathworks.com!cyclone.swbell.net!nnrp3.sbc.net.POSTED!not-for-mail From: "Pat Rogers" Newsgroups: comp.lang.ada References: <3AA80A68.A2C8B042@worldnet.att.net> <3AA84FC7.CE523E9D@worldnet.att.net> Subject: Re: Generic Formal Parameter for a Task Type X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 Message-ID: <1YYp6.431$ea4.144930@nnrp3.sbc.net> Date: Thu, 8 Mar 2001 22:26:36 -0600 NNTP-Posting-Host: 208.191.184.67 X-Complaints-To: abuse@swbell.net X-Trace: nnrp3.sbc.net 984111997 208.191.184.67 (Thu, 08 Mar 2001 22:26:37 CST) NNTP-Posting-Date: Thu, 08 Mar 2001 22:26:37 CST Organization: SBC Internet Services Xref: supernews.google.com comp.lang.ada:5562 Date: 2001-03-08T22:26:36-06:00 List-Id: See RM C.7.1 for package Ada.Task_Identification, specifically function Is_Terminated. That may be enough... "James Rogers" wrote in message news:3AA84FC7.CE523E9D@worldnet.att.net... > The problem with using a formal limited private type is in the > need to determine if one of the tasks being monitored has terminated. > > The 'Terminated attribute only applies to Task objects, either > directly, or implicitly through an access to the task object. > > A limited private type is too general. It is not viewed within the > generic as a task type. I know. I tried this first. > > The only way to make such a system work is to creat a limited record > type containing an access to task type. You could then create a > function taking a parameter of the record type, returning the proper > response from the 'Terminated attribute. > > Although this is easily done, it is not what I wanted. I had hoped > to be able to create a generic package directly usable with most > any task type. > > This appears to be one problem not solvable in Ada, yet easily > solved in Java. > > I would like to add a generic task type formal parameter to the > list of improvements for the next version of Ada. > > Jim Rogers > Colorado Springs, Colorado USA > > Pat Rogers wrote: > > > > "James Rogers" wrote in message > > news:3AA80A68.A2C8B042@worldnet.att.net... > > > I have looked through "Ada as a Second Language" and the Ada Reference > > > manual. I cannot find any proper form to pass a task type as a > > > generic formal parameter. > > > > > > Is there a generic formal parameter form for this purpose? > > > > > > I wanted to create a generic package I call Task_Governor. This > > > package would control the number of tasks one could create at once. > > > The idea is that task resources may be limited. This package would > > > allow someone to limit the number of tasks to a maximum specified. > > > An instantiation of the package would monitor the tasks it started > > > and allow another to be started when one of the tasks terminated. > > > > > > My problem is that I cannot figure out how to specify a task type > > > as a generic formal parameter. > > > > There is no generic formal task type; you have to use a limited private > > formal. > > > > --- > > Patrick Rogers Consulting and Training in: > > http://www.classwide.com Real-Time/OO Languages > > progers@classwide.com Hard Deadline Schedulability Analysis > > (281)648-3165 Software Fault Tolerance >