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From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Requeue in GNAT 3.14p (Linux)
Date: Wed, 19 Jun 2002 15:17:45 +0200
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Date: 2002-06-19T15:17:45+02:00
List-Id: <comp.lang.ada>

Hi!

The following code is the distilled problem. When a chain of external
requeues returns back to a protected object it causes a hang-up on the
last requeue. It happens in GNAT 3.14p under Linux. Interestingly is
that under Windows NT it works. I found nothing in ARM that forbids
that. Is it a GNAT bug?

------------------------------ test.adb
with Ping_Pong; use Ping_Pong;

procedure Test is
begin
   A.Service;
end Test;
------------------------------ ping_pong.ads
package Ping_Pong is
   protected A is
      entry Service;
      entry Back;
   end A;
   
   protected B is
      entry Wall;
   end B;
   
end Ping_Pong;
---------------------------- ping_pong.adb
with Text_IO;

package body Ping_Pong is
   protected body A is
      entry Service when True is
      begin
         Text_IO.Put_Line ("Service!");
         requeue B.Wall;
      end Service;
      entry Back when True is
      begin
         Text_IO.Put_Line ("Got it!");
      end Back;
   end A;
   
   protected body B is
      entry Wall when True is
      begin
         Text_IO.Put_Line ("Wall!");
         requeue A.Back;
      end Wall;
   end B;

end Ping_Pong;

---
Regards,
Dmitry Kazakov
www.dmitry-kazakov.de