File : agpl-event_queues.ads


------------------------------------------------------------------------------

--                         ADAGIO - ADALID - AENEA.                         --

--                                                                          --

--                            Copyright (C) 2003                            --

--                                 A. Mosteo.                               --

--                                                                          --

--  Authors: A. Mosteo. (adagio@mosteo.com)                                 --

--                                                                          --

--  If you have any questions in regard to this software, please address    --

--  them to the above email.                                                --

--                                                                          --

--  This program is free software; you can redistribute it and/or modify    --

--  it under the terms of the GNU General Public License as published by    --

--  the Free Software Foundation; either version 2 of the License, or (at   --

--  your option) any later version.                                         --

--                                                                          --

--  This program is distributed in the hope that it will be useful, but     --

--  WITHOUT ANY WARRANTY; without even the implied warranty of              --

--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       --

--  General Public License for more details.                                --

--                                                                          --

--  You should have received a copy of the GNU General Public License       --

--  along with this library; if not, write to the Free Software Foundation, --

--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --

--                                                                          --

--  You are not allowed to use any part of this code to develop a program   --

--  whose output would be used to harass or prosecute other users of the    --

--  networks Adagio connects with. All data collected with Adagio or a tool --

--  containing Adagio code about other network users must remain            --

--  confidential and cannot be made public by any mean, nor be used to      --

--  harass or legally prosecute these users.                                --

------------------------------------------------------------------------------

--  $Id: event_queue.ads,v 1.6 2004/01/29 21:47:09 Jano Exp $


-- Efficient event queue. Useful for timeouts, as an example.


-- Implemented with tagged types. That makes genericity unnecesary. A queue

--   can perform multiple kind of events.


package Agpl.Event_queues is

   -- This type can be extended to match any required context

   type Context_type is tagged null record;
   type Context_access is access all Context_type'Class;
--   for Context_access'Storage_pool use Adagio.Debug_pool;


   -- Callback function called when event triggers

   type Action_procedure is access procedure (Context : in Context_access);

private

   type Action_type is (New_event, Job_finished);

end Agpl.Event_queues;