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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Need info about Ada tasks
Newsgroups: comp.lang.ada
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Organization: cbb software GmbH
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Date: Thu, 25 Sep 2008 15:49:28 +0200
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Date: 2008-09-25T15:49:28+02:00
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On Thu, 25 Sep 2008 13:31:27 GMT, Fionn Mac Cumhaill wrote:

> My simple solution has a minor problem; I have a select just after the
> display routine that receives the abort message, but if the message
> doesn't arrive on time I get another iteration of the loop before the
> task aborts. How can I make this thing abort immediately, even when I
> have a delay(60.0) to give a 1-minute delay between display refreshes?
> I.e., how do I bail out in the middle of a delay?

1. If the abort event is implemented as a protected object:

task body Refresh_Engine is
begin
   loop
      ... -- Refresh the display
      select -- Timed entry call
         Abort_Event.Wait;
         exit;
      or delay 60.0;
      end select;
   end loop;
end Refresh_Engine;

2. If the abort event is signaled by an entry call:

task body Refresh_Engine is
begin
   loop
      ... -- Refresh the display
      select -- Selective accept with a time out alternative
         accept Abort_Event;
         exit;
      or delay 60.0;
      end select;
   end loop;
end Refresh_Engine;

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