Move futex wakeup model to nto1-selective

[userspace-rcu.git] / futex-wakeup / futex.spin

diff --git a/futex-wakeup/futex.spin b/futex-wakeup/futex.spin
deleted file mode 100644 (file)
index c68a77b..0000000
--- a/futex-wakeup/futex.spin
+++ /dev/null
@@ -1,159 +0,0 @@
-/*
- * futex.spin: Promela code to validate futex wakeup algorithm.
- *
- * Algorithm verified :
- *
- * queue = 0;
- * waiting = 0;
- * gp_futex = 0;
- * gp = 1;
- *
- *                          Waker
- *                          while (1) {
- *                            this.queue = gp;
- *                            if (this.waiting == 1) {
- *                              this.waiting = 0;
- *                              if (gp_futex == -1) {
- *                                gp_futex = 0;
- *                                futex_wake = 1;
- *                              }
- *                            }
- *                          }
- *
- * Waiter
- * in_registry = 1;
- * while (1) {
- *   gp_futex = -1;
- *   waiting |= (queue != gp);
- *   in_registry &= (queue != gp);
- *   if (all in_registry == 0) {
- * progress:
- *     gp_futex = 0;
- *     gp = !gp;
- *     restart;
- *   } else {
- *     futex_wake = (gp_futex == -1 ? 0 : 1);
- *     while (futex_wake == 0) { }
- *   }
- *   queue = 0;
- * }
- *
- * By testing progress, i.e. [] <> !np_, we check that an infinite sequence
- * of update_counter_and_wait (and consequently of synchronize_rcu) will
- * not block.
- *
- * 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
- */
-
-#define get_pid()       (_pid)
-
-int queue[2] = 0;
-int waiting[2] = 0;
-int futex_wake = 0;
-int gp_futex = 0;
-int gp = 1;
-int in_registry[2] = 0;
-
-active [2] proctype waker()
-{
-       assert(get_pid() < 2);
-
-       do
-       :: 1 ->
-               queue[get_pid()] = gp;
-       
-               if
-               :: (waiting[get_pid()] == 1) ->
-                       waiting[get_pid()] = 0;
-                       if
-                       :: (gp_futex == -1) ->
-                               gp_futex = 0;
-#ifndef INJ_QUEUE_NO_WAKE
-                               futex_wake = 1;
-#endif
-                       :: else ->
-                               skip;
-                       fi;
-               fi;
-       od;
-}
-
-
-active proctype waiter()
-{
-restart:
-       in_registry[0] = 1;
-       in_registry[1] = 1;
-       do
-       :: 1 ->
-#if (!defined(INJ_LATE_DEC) && !defined(INJ_INVERT_WAITING_VS_GP_FUTEX))
-               gp_futex = -1;
-#endif
-               if
-               :: (in_registry[0] == 1 && queue[0] != gp) ->
-                       waiting[0] = 1;
-                :: else ->
-                       skip;
-               fi;
-               if
-               :: (in_registry[1] == 1 && queue[1] != gp) ->
-                       waiting[1] = 1;
-                :: else ->
-                       skip;
-               fi;
-
-               if
-               :: (in_registry[0] == 1 && queue[0] == gp) ->
-                       in_registry[0] = 0;
-               :: else ->
-                       skip;
-               fi;
-               if
-               :: (in_registry[1] == 1 && queue[1] == gp) ->
-                       in_registry[1] = 0;
-               :: else ->
-                       skip;
-               fi;
-#ifdef INJ_INVERT_WAITING_VS_GP_FUTEX
-               gp_futex = -1;
-#endif
-
-               if
-               :: (in_registry[0] == 0 && in_registry[1] == 0) ->
-progress:
-#ifndef INJ_LATE_DEC
-                       gp_futex = 0;
-#endif
-                       gp = !gp;
-                       goto restart;
-               :: else ->
-#ifdef INJ_LATE_DEC
-                       gp_futex = -1;
-#endif
-                       futex_wake = gp_futex + 1;
-                       do
-                       :: 1 ->
-                               if
-                               :: (futex_wake == 0) ->
-                                       skip;
-                               :: else ->
-                                       break;
-                               fi;
-                       od;
-               fi;
-       od;
-}