--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tests/gov/nasa/jpf/test/mc/threads/HORaceTest.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed under the
+ * Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0. 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+
+package gov.nasa.jpf.test.mc.threads;
+
+import gov.nasa.jpf.util.test.TestJPF;
+
+import org.junit.Test;
+
+/**
+ * high order data race
+ */
+public class HORaceTest extends TestJPF {
+
+  static class D {
+    int a;
+    int b;
+
+    D (int x, int y){
+      a = x;
+      b = y;
+    }
+
+    D (D other){
+      setA( other.getA());
+      Thread.yield(); // give the 2nd thread a chance to interfere
+      setB( other.getB());
+    }
+
+    synchronized int getA() { return a; }
+    synchronized int getB() { return b; }
+    synchronized void setA(int x){ a = x; }
+    synchronized void setB(int x){ b = x; }
+
+    synchronized void change(int delta) {
+      a += delta;
+      b += delta;
+    }
+
+    synchronized boolean isConsistent() {
+      return a == b;
+    }
+  }
+
+  static D d1;
+  static D d2;
+
+  @Test
+  public void testHighOrderRace() {
+
+    if (verifyAssertionErrorDetails("inconsistent d2")) {
+      d1 = new D(42, 42);
+
+      Thread t1 = new Thread() {
+
+        @Override
+		public void run() {
+          d2 = new D(d1);
+        }
+      };
+      Thread t2 = new Thread() {
+
+        @Override
+		public void run() {
+          d1.change(-1);
+        }
+      };
+
+      t1.start();
+      t2.start();
+
+      try {
+        t1.join();
+        t2.join();
+      } catch (InterruptedException ix) {
+        fail("unexpected interrupt during {t1,t2}.join()");
+      }
+
+      System.out.print("d2 = ");
+      System.out.print(d2.a);
+      System.out.print(',');
+      System.out.println(d2.b);
+
+      assert d2.isConsistent() : "inconsistent d2";
+    }
+  }
+
+}