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Date: Mon, 30 Apr 2018 05:27:42 -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:51830
Date: 2018-04-30T05:27:42-07:00
List-Id: <comp.lang.ada>

Am Sonntag, 29. April 2018 21:36:37 UTC+2 schrieb Dmitry A. Kazakov:
> On 2018-04-29 19:41, AdaMagica wrote:
> > Am Samstag, 28. April 2018 10:35:34 UTC+2 schrieb Dmitry A. Kazakov:
> >=20
> >> 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.
>=20
> Anything necessary to finalize the class-wide object. E.g. informing a=20
> task component to complete:

What is this "anything"? I do not see a connection from class-wide type to =
its task components. What is the connection of class-wide type to other com=
ponents? What's the difference between task components and other (perhaps l=
imited) components? What does class-wide finalize do to those other compone=
nts?

In short: If you look inside a class-wide object, you'll find inside an obj=
ect of a specific type within this class (as Randy said in a previous post)=
. What's the property of this specific object seen as a class-wide object t=
hat's not a property of the specific object?

(I have problems expressing what I want to say.I

>     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;
>=20
>     procedure Finalize (Object : in out T1'Class) is
>     begin
>        Object.Worker.Shutdown;
>     end Finalize;
>=20
> Differently to type-specific Finalize in a class-wide Finalize it is OK=
=20
> to make dispatching calls.