File : adagio-monitor.adb
------------------------------------------------------------------------------
-- 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: adagio-monitor.adb,v 1.3 2004/01/21 21:05:48 Jano Exp $
package body Adagio.Monitor is
protected body Semaphore is
entry P when true is
begin
if Caller = P'Caller then
In_use := In_use + 1;
elsif In_use = 0 then
Caller := P'Caller;
In_use := 1;
else
requeue Safe_P with abort;
end if;
end P;
entry Safe_P when In_use = 0 is
begin
Caller := Safe_P'Caller;
In_use := 1;
end Safe_P;
entry V when true is
begin
if V'Caller /= Caller then
raise Use_error;
else
In_use := In_use - 1;
if In_use = 0 then
Caller := Null_task_id;
end if;
end if;
end V;
end Semaphore;
-- Get
procedure Initialize(this: in out Object) is
begin
this.S.P;
end Initialize;
-- Release
procedure Finalize(this: in out Object) is
begin
this.S.V;
end Finalize;
end Adagio.Monitor;