import java.util.concurrent.atomic.AtomicReference;
import sun.misc.Unsafe;
public class TestUnsafe extends AtomicReference<Node>{
  public static void main(String[] args) {
    for (int i = 0; i < 10000; i++) {
        Node n1 = new Node(i);
        Node n2 = new Node(i+1);
        TestUnsafe t = new TestUnsafe(n1);
        Node old = t.foo(n2);
 
        if(old.next.v > 20000) {
           System.out.println("not enter here" + old.next.v);
        }
    }
  }
  TestUnsafe(Node n) {super(n);}
 
  public Node foo(Node n) {
    Node old;
    old = this.getAndSet(n); // inline sun.misc.Unsafe::getAndSetObject here
    old.next = n;
    return old;
  }
}
class Node
{
   int v;
   Node next;
   Node(int i) {v = i; next = null;}
}