在Java内存模型中测试并发程序代码

import java.util.BitSet;
import java.util.concurrent.CountDownLatch;
 
public class AnExample {
 
  public static void main(String[] args) throws Exception {
    BitSet bs = new BitSet();
    CountDownLatch latch = new CountDownLatch(1);
    Thread t1 = new Thread(new Runnable() {
      public void run() {
        try {
          latch.await();
          Thread.sleep(1000);
        } catch (Exception ex) {
        }
        bs.set(1);
      }
    });
    Thread t2 = new Thread(new Runnable() {
      public void run() {
        try {
          latch.await();
          Thread.sleep(1000);
        } catch (Exception e) {
        }
        bs.set(2);
      }
    });
 
    t1.start();
    t2.start();
    latch.countDown();
    t1.join();
    t2.join();
   // crucial part here:
    System.out.println(bs.get(1));
    System.out.println(bs.get(2));
  }
}

public class AnExampleTest implements 
      Actor2_Arbiter1_Test {
 
 @Override
 public void actor1(BitSet s, BooleanResult2 r) {
  s.set(1);
 }
 
 @Override
 public void actor2(BitSet s, BooleanResult2 r) {
  s.set(2);
 }
 
 @Override
 public void arbiter1(BitSet s, BooleanResult2 r) {
  r.r1 = s.get(1);
  r.r2 = s.get(2);
 }
 
 @Override
 public BitSet newState() {
  return new BitSet();
 }
 
 @Override
 public BooleanResult2 newResult() {
  return new BooleanResult2();
 }
}

 
  Oleg Shelajev
  
   Tests if BitSet works well without synchronization.
  
  
   [true, true]
   ACCEPTABLE
   
    Seeing all updates intact.
   
  
  
   [true, false]
   ACCEPTABLE_INTERESTING
   
    T2 overwrites T1 result.
   
  
  
   [false, true]
   ACCEPTABLE_INTERESTING
   
    T1 overwrites T2 result.
   
  
  
   FORBIDDEN
   
    All other cases are unexpected.
   
  
 

java -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-RestrictContended -jar tests-custom/target/jcstress.jar -t=".*AnExampleTest"

synchronized (bs) {
 bs.set(1);
}