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From: Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: confusion about message passing between the tasks
Date: Sat, 25 Oct 2014 17:24:02 -0700
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Date: 2014-10-25T17:24:02-07:00
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On 10/25/2014 04:55 PM, compguy45@gmail.com wrote:
> i am trying here to increase by 1 in accept block and execute until its 75...
> why variable k doesnt keep its increased value once accept block is done?
> 
>  18 task body Counter_Task is
>  19         V : Integer := 0;
>  20     begin
>  21         loop
>  22             select
>  23                     accept Get (Check : Integer ; Value : out Integer) do
>  24                    -- put("Value of Check is "); put(Check);new_line;
>  25                     V := Check;
>  26                     V := V + 1;
>  27                     Value := V;
>  28                     put("Value V the accept block is   ");put(V);new_line;
>  29                 end Get;
>  30             or  
>  31                 terminate;
>  32             end select;
>  33         end loop;
>  34     end Counter_Task;
>  36 begin
>  37   i := 0;
>  38   k := 0;
>  39   delay 1.00;
>  40   while k /= 75 loop
>  41     p.Get(i,k);

This effectively does

K := I + 1;

and I never changes.

In another post:

>  23                 accept Get (Value : out Integer) do
>  24                     put("Value of parametar passed in is ");put(Value); 
>                         --Why am i getting zero printed???

Nothing is passed in. Value is an out parameter of a pass-by-copy type. It
begins with an undefined value, and its value at the end of the accept is copied
into the actual parameter.

-- 
Jeff Carter
"Your mother was a hamster and your father smelt of elderberries."
Monty Python & the Holy Grail
06