+++ /dev/null
-/*
- * 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 program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (c) 2009 Mathieu Desnoyers
- */
-
-byte lock = 0;
-byte refcount = 0;
-
-inline spin_lock(lock)
-{
- do
- :: 1 -> atomic {
- if
- :: (lock) ->
- skip;
- :: else ->
- lock = 1;
- break;
- fi;
- }
- od;
-}
-
-inline spin_unlock(lock)
-{
- lock = 0;
-}
-
-proctype proc_A()
-{
- do
- :: 1->
-progress_A:
- spin_lock(lock);
- refcount = refcount + 1;
- refcount = refcount - 1;
- spin_unlock(lock);
- od;
-}
-
-proctype proc_B()
-{
- do
- :: 1->
- spin_lock(lock);
- refcount = refcount + 1;
- refcount = refcount - 1;
- spin_unlock(lock);
- od;
-}
-
-init
-{
- run proc_A();
- run proc_B();
-}