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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: Sun, 26 Oct 2014 16:23:32 -0700
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Date: 2014-10-26T16:23:32-07:00
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On 10/26/2014 03:27 PM, Robert A Duff wrote:
> 
> Maybe.  Here's my PO code:
> 
>     type State_Enum is (Accepting_Entry_1, Accepting_Entry_2);
> 
>     protected P is
>         entry Entry_1;
>         entry Entry_2;
>     private
>         State: State_Enum := Accepting_Entry_1;
>     end P;
> 
>     protected body P is
> 
>         entry body Entry_1 when State = Accepting_Entry_1 do
>             ...
>             if ...
>                 State := Accepting_Entry_2;
>         end Entry_1;
> 
>         entry body Entry_2 when State = Accepting_Entry_2 do
>             ...
>             if ...
>                 State := Accepting_Entry_1;
>         end Entry_2;
> 
>     end P;
> 
> Can you show equivalent code using "accept"?

I'm pretty sure entry bodies use "is", not "do".

I think so.

task T is
   pragma Passive;

   entry Entry_1;
   entry Entry_2;
end T;

task body T is
   State : State_Enum := Accepting_Entry_1;
begin -- T
   loop
      select when State = Accepting_Entry_1 =>
         accept Entry_1 do
            ...
            if ... then
               State := Accepting_Entry_2;
            end if;
         end Entry_1;
      or when State = Accepting_Entry_2 =>
         accept Entry_2 do
            ...
            if ... then
               State := Accepting_Entry_1;
            end if;
         end Entry_2;
      or
         terminate;
      end select;
   end loop;
end T;

-- 
Jeff Carter
"Why, the Mayflower was full of Fireflies, and a few
horseflies, too. The Fireflies were on the upper deck,
and the horseflies were on the Fireflies."
Duck Soup
95