import java.util.*;

public class BusyWait implements Runnable {

  protected MySignal signal;
  
  BusyWait(MySignal s) {
    signal = s;
  }
  
  public static void main(String args[]) {
    MySignal sharedSignal = new MySignal();
    new Thread(new BusyWait(sharedSignal)).start();
    new Thread(new BusyWait(sharedSignal)).start();
  }
  
  public void run() {
    try {
      while(signal.hasDataToProcess() == false) {
      }
      signal.setHasDataToProcess(false);   
      int i;
      for(i=0; i<10; i++) {
        Thread.sleep(100);
        System.out.println(Thread.currentThread().getName()+" iteration: "+i);
      }
      signal.setHasDataToProcess(true);
      System.out.println("Exiting!");
    }
    catch(InterruptedException ex) {
      ex.printStackTrace();
    }
  }

}