content: /*
   * Copyright (C) 2009 The Android Open Source Project
   *
   * 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.
   */
  
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicLong;
  
  /**
   * Test for Jit regressions.
   */
  public class Main {
      public static void main(String args[]) throws Exception {
          b17689750TestVolatile();
          b17689750TestMonitor();
      }
  
      static void b17689750TestVolatile() {
          final B17689750TestVolatile test = new B17689750TestVolatile();
          new Thread() {
              public void run() {
                  test.thread1();
              }
          }.start();
          try {
              test.thread2();
          } catch (NullPointerException expected) {
              System.out.println("b17689750TestVolatile passed.");
          }
      }
  
      static void b17689750TestMonitor() {
        final B17689750TestMonitor test = new B17689750TestMonitor();
        new Thread() {
          public void run() {
            test.thread1();
          }
        }.start();
        try {
          test.thread2();
        } catch (NullPointerException expected) {
          System.out.println("b17689750TestMonitor passed.");
        }
      }
  }
  
  class B17689750TestVolatile {
    private volatile int state = 0;
    private int[] values = { 42 };
  
    void thread1() {
      while (state != 1) { }  // Busy loop.
      values = null;
      state = 2;
    }
  
    void thread2() {
      int[] vs1 = values;
      state = 1;
      while (state != 2) { }  // Busy loop.
      int[] vs2 = values;
      int v1 = vs1[0];
      int v2 = vs2[0];
      System.out.println("b17689750TestVolatile failed: " + v1 + ", " + v2);
    }
  }
  
  class B17689750TestMonitor {
    private int state = 0;
    private Object lock = new Object();
    private int[] values = { 42 };
  
    void thread1() {
      int s;
      do {
        synchronized (lock) {
          s = state;
        }
      } while (s != 1);  // Busy loop.
  
      synchronized (lock) {
        values = null;
        state = 2;
      }
    }
  
    void thread2() {
      int[] vs1;
      synchronized (lock) {
        vs1 = values;
        state = 1;
      }
  
      int s;
      do {
        synchronized (lock) {
          s = state;
        }
      } while (s != 2);  // Busy loop.
  
      int[] vs2 = values;
      int v1 = vs1[0];
      int v2 = vs2[0];
      System.out.println("b17689750TestMonitor failed: " + v1 + ", " + v2);
    }
  }
  