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From: susan satnford <lover72@bolt.com>
Subject: Re: Are delay statements abortable?
Date: 2000/01/10
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davidb42 wrote:
> 
> 
> Are delay statements interruptable/abortable?
> yes they are
> 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;
> 
> REMOVED INCLUDED FILE Test_Abort_of_Delay;
> 
> 
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> Before you buy.


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