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Newsgroups: comp.lang.ada
Date: Fri, 27 Apr 2018 01:32:19 -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:51744
Date: 2018-04-27T01:32:19-07:00
List-Id: <comp.lang.ada>

Am Freitag, 27. April 2018 09:37:46 UTC+2 schrieb Dmitry A. Kazakov:
> You *can* finalize the class of the object containing the task with the 
> task component still running:
> 
>     type Container_Type is .. tagged ...
>        T : Task_Type;
> 
> The order of finalization must be:
> 
>     Finalize Container_Type'Class;
>     Stop T;                  -- Existing order

IIUC, you mean the task T is stopped anywhere in the middle of its work? Ada calls this abort. This means a lot of things may be left in an invalid state.

Normal task completion takes place at defined places, everything is left in a well-defined state. It's your design work to define those places.

>     Finalize Container_Type;
>     Finalize T;
> 
> Note that Ada 95 type system wisely distinguished Container_Type'Class