Re: Are delay statements abortable?

[Ross <@gec.com>]

I don't believe they are in ada terms, but you could always pull the
plug.....
R.

davidb42@my-deja.com wrote:

> Are delay statements interruptable/abortable?
>
> I was expecting delay statements in tasks (or in the abortable part of
> an asynchronous select construct) to be brought to a premature end on
> aborting the task (or on the triggering event).
>
> However, in the Ada implementation I am using, the abortion only seems
> to take effect at the expiry of the delay.
>
> For example, in the program below, the main task completes after 25
> seconds, but the dependent task (and thus the program as a whole)
> doesn't terminate until 40 seconds (at expiry of the 2nd 20 second
> delay).
>
> Is this right?
>         David Bowerman
>         CSC Australia.
>
>    **************************************************************
> with Text_IO;
> procedure Test_Abort_of_Delay is
>
>   task Dependent_Task;
>   task body Dependent_Task is
>   begin
>     Text_IO.Put_Line ("Starting dependent task.");
>
>     delay 20.0;
>     Text_IO.Put_Line ("20 second delay has completed.");
>     delay 20.0;
>     Text_IO.Put_Line ("40 second delay has completed.");
>     delay 20.0;
>     Text_IO.Put_Line ("60 second delay has completed.");
>     delay 20.0;
>     Text_IO.Put_Line ("80 second delay has completed.");
>
>     Text_IO.Put_Line ("Completing dependent task.");
>   end Dependent_Task;
>
> begin
>   -- Main task
>   Text_IO.Put_Line ("Starting main task.");
>
>   delay 25.0;
>   abort Dependent_Task;
>
>   Text_IO.Put_Line ("Completing main task.");
> end Test_Abort_of_Delay;
>
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