//import be.ac.vub.ir.util.Chrono;

public class ObjectAsMonitor {

	public synchronized void f1(){
		try {
			Thread.sleep(100);
		} catch (InterruptedException e) {}
	}
	public synchronized void f2(){
		try {
			Thread.sleep(100);
		} catch (InterruptedException e) {}
	}
	/**
	 * @param args
	 * @throws InterruptedException 
	 */
	public static void main(String[] args) throws InterruptedException {
//		Chrono chrono = new Chrono();
		long t1 = System.nanoTime();
		final ObjectAsMonitor monitor = new ObjectAsMonitor();
		
		final int NBR_THREADS=4, NBR_ITERATIONS=10;
		
		Thread[] threads = new Thread[NBR_THREADS];
		for(int i=0;i<NBR_THREADS;i++){
			threads[i] = new Thread(){
				public void run(){
					for(int i=0;i<10;i++){
						monitor.f1();
						monitor.f2();
					}
				}
			};
			threads[i].start();
		}
		for(int i=0;i<NBR_THREADS;i++){
			threads[i].join();
		}
		long t2 = System.nanoTime();
//		chrono.stop();
		System.out.println("Time for "+NBR_THREADS+" threads and "+NBR_ITERATIONS+" iterations: "+ ((t2 - t1)/1000));
	}

}