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.
19 package gov.nasa.jpf.test.mc.basic;
21 import gov.nasa.jpf.util.test.TestJPF;
22 import gov.nasa.jpf.vm.Verify;
24 import org.junit.Test;
27 * Ensures that a recursive lock/unlock doesn't leave the lock in an acquired state.
29 public class UnlockNonSharedTest extends TestJPF
32 public void test() throws InterruptedException
37 if (verifyNoPropertyViolation())
39 Verify.setProperties("vm.por.skip_local_sync=true");
52 private final Object m_lock = new Object();
65 task.run(); // Acquire m_lock in a single-threaded state so that MONITOREXIT.isShared() will return false. (The bug would cause ei.unlock() to not be called).
67 thread = new Thread(task); // Create a thread to acquire m_lock.
69 thread.setDaemon(false);
70 thread.start(); // To reproduce the bug, this thread shouldn't start executing until after the main thread exits. This thread should then execute to the point just before acquiring m_lock.
72 thread = new Thread(nop); // Create another thread. This thread must not be able to reach m_lock.
74 thread.setDaemon(false);
75 thread.start(); // This thread should start and exit before the above thread acquires m_lock. Due to the bug, the above thread won't be able to acquire the lock and hence a "deadlock" will ensue.