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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Finalization of library level tasks
Date: Wed, 18 Apr 2018 17:04:56 +0200
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Xref: reader02.eternal-september.org comp.lang.ada:51597
Date: 2018-04-18T17:04:56+02:00
List-Id: <comp.lang.ada>

On 18/04/2018 16:52, J-P. Rosen wrote:
> Le 18/04/2018 à 16:12, Dmitry A. Kazakov a écrit :
>> In pseudo-code:
>>
>>     task body Worker is
>>     begin
>>        while the object lives loop
>>           do some chunk of work
>>        end loop;
>>     end Worker;
>>
>> P.S. I posted an example in a separate thread. The posted solution
>> should work except the cases when the access type is at the same level
>> as the object and both are below the library level.
>>
> OK. You were actually quite close... Use a killer task (with the same
> master as your worker) like this:
> 
> task Killer is
>     entry Never_Called;
> end Killer;
> 
> task body Killer is
> begin
>     accept Never_Called;
> exception
>     when Tasking_Error =>
>       -- Kill the other task
> end Killer;
> 
> Hint: when the master completes, Tasking_Error is raised in all tasks
> waiting on entries that depend on that master.

Does it raise for all entries? If it does no killer task is needed:

    task body Worker is
    begin
       loop
          begin
             select
                accept Never;
             else
                null;
             end select;
          exception
             when Tasking_Eror =>
                exit;
          end;
          do some chunk of work
       end loop;
    end Worker;

Should this work?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de