2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0.
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 package gov.nasa.jpf.search.heuristic;
20 import gov.nasa.jpf.Config;
21 import gov.nasa.jpf.vm.VM;
25 * Heuristic state prioriizer that maximizes number of blocked states. This
26 * is a classic heuristic for finding deadlocks, since a deadlock requires
27 * all threads to be blocked.
29 public class MostBlocked extends SimplePriorityHeuristic {
31 public MostBlocked (Config config, VM vm) {
36 protected int computeHeuristicValue () {
37 int alive = vm.getThreadList().getMatchingCount(aliveThread);
38 int runnable = vm.getThreadList().getMatchingCount(vm.getTimedoutRunnablePredicate());
40 // pcm - the (iSystemState based) condition was "!runnable && alive"
41 // the '10000' is just a potential max thread count
42 int h_value = (10000 - (alive - runnable));