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Date: Wed, 18 Apr 2018 01:06:19 -0700 (PDT)
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Subject: Re: Finalization of library level tasks
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader02.eternal-september.org comp.lang.ada:51576
Date: 2018-04-18T01:06:19-07:00
List-Id: <comp.lang.ada>

Am Dienstag, 17. April 2018 14:31:24 UTC+2 schrieb Dmitry A. Kazakov:
> On 17/04/2018 11:51, AdaMagica wrote:
>>>>      task body T is
>>>>      begin
>>>>         loop
>>>>            exit when not T'Callable;
>>>>            ... -- Do something
>>>>         end loop;
>>>>      end T;
> > As I understand RM 9.3, when this task T is going out of scope, i.e. if=
 it is declared inside for instance in a block, the block can only be left =
when the task is completed (the block is the master, see 7.6.1), and I cann=
ot see that the conditions on T to be completed can ever be fulfilled for T=
.
>=20
> Quite naturally, when the master is being finalized it marks the task as=
=20
> terminating and waits for its completion. The task marked for=20
> termination has T'Callable false and so terminates.

Dmitry, please quote the RM where you can find this rule - I'm certain you =
will not find it.

Your model of tasking in Ada is not completely in line with the RM.
T'Callable is true as long as the T has not finished its body, and there is=
 an infinite loop, so it cannot stop.

> The meaning of
>
>    select
>       terminate;
>    else
>       null;
>    end select;
>
> is crystal clear: continue if no master did request termination else
> continue. Again, I thought that T'Callable were there to determine if a
> master wants the task to terminate. RM is silent about that. Even for
> the environment task it is in a side note.

May be in your mind, but not in the RM. Your model is wrong.