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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Finalization of library level tasks
Date: Wed, 25 Apr 2018 18:49:13 -0500
Organization: JSA Research & Innovation
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Xref: reader02.eternal-september.org comp.lang.ada:51713
Date: 2018-04-25T18:49:13-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:pb0bho$p1e$1@gioia.aioe.org...
> On 2018-04-15 21:32, Egil H H wrote:
>> On Sunday, April 15, 2018 at 7:40:38 PM UTC+2, Dmitry A. Kazakov wrote:
>>>
>>> Terminate alternative is almost always useless because it cannot be
>>> mixed with "else" or "delay". If there were a way to check within the
>>> task if its completion has been requested
>>
>> For library level tasks:
>>
>> loop
>>     select
>>        accept Some_Rendezvous;
>>     or
>>        delay Some_Interval;
>>     end select;
>>      exit when not Ada.Task_Identification.Is_Callable
>>        (Ada.Task_Identification.Environment_Task);
>>      end loop;
>
> Yes, that is what I was looking for. T'Callable on the task itself does 
> the trick. Apparently task being terminated is not callable.

Callable becomes False when a task is completed. That happens before 
finalization and before termination.

The environment task completes when the main subprogram exits, and you can 
test that as above.

            Randy.