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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Finalization of library level tasks
Date: Sun, 29 Apr 2018 21:36:34 +0200
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Xref: reader02.eternal-september.org comp.lang.ada:51807
Date: 2018-04-29T21:36:34+02:00
List-Id: <comp.lang.ada>

On 2018-04-29 19:41, AdaMagica wrote:
> Am Samstag, 28. April 2018 10:35:34 UTC+2 schrieb Dmitry A. Kazakov:
> 
>> All these instances *must* be finalized: X of T1 <- T2 <- T3 must be
>> finalized in the order
>>
>>      Finalize (T1'Class (X));
>>      Finalize (T2'Class (X));
>>      Finalize (T3'Class (X));
> I don't have the slightest idea what should happen there.

Anything necessary to finalize the class-wide object. E.g. informing a 
task component to complete:

    type T1;
    task type Worker_Type (Parent : not null access T1'Class) is
       entry Shutdown;
    end Worker_Type;
    type T1 is new Ada.Finalization.Limited_Controlled with record
       Worker : Worker_Type;
    end record;

    procedure Finalize (Object : in out T1'Class) is
    begin
       Object.Worker.Shutdown;
    end Finalize;

Differently to type-specific Finalize in a class-wide Finalize it is OK 
to make dispatching calls.

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