gistfile1.java

import java.util.concurrent.atomic.AtomicBoolean;

public class Test {
  public static void main(String args[]) {
    final AtomicBoolean takenLock = new AtomicBoolean();
    final Object foo = new Object();

    Thread t = new Thread() {
        public void run() {
          synchronized (foo) {
            while (true) {
              takenLock.set(true);
              try {
                foo.wait();
              } catch (InterruptedException ie) {
                Thread.currentThread().interrupt();
              }
            }
          }
        }
      };

    t.start();
    t.interrupt();

    System.err.println("Waiting for thread to take lock");
    while (!takenLock.get()) { Thread.yield(); }
    System.err.println("Trying to take lock myself");

    synchronized (foo) {
      System.err.println("got lock");
    }
  }
}