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Date: Mon, 09 May 2005 09:29:39 -0500
From: "Marc A. Criley" <mcNOSPAM@mckae.com>
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Subject: Re: Dynamic task activation
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Date: 2005-05-09T09:29:39-05:00
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Jean-Pierre Rosen wrote:
> evangeli@cnam.fr a �crit :
> 
>> hello
>> let's take this piece of code :
>>
>> ====================================
>> ...
>> task type T_Task;
>> type T is access T_Task;
>> ...
>> V : T := new T_Task;
>> --  1
>> ...
>> ====================================
>>
>> Is the task pointed by V necessarily activated at point 1, or can it be
>> activated later?
>>
>>> From RM 9.2.4, I guess the answer is yes but i wanted to be sure.
>>
>>
> The task is activated *before* the return from "new". The goal is that 
> when you can access the task, it is guaranteed to have been activated.

And if for some reason you don't want the task to actually begin its 
application-specific processing until later, you can declare some kind 
of "Start" entry in the task, which is then called at the appropriate time.

task body T_Task_That_Waits is
begin
    select
       accept Start;
    or
       terminate;
    end select;

    -- Application-oriented processing now begins...

end T_Task_That_Waits;


Marc A. Criley
www.mckae.com