public class Controller {
	private boolean inUse = false;
	
	public synchronized void askFor() {
		while (inUse)
			try {
				wait();
			} catch (InterruptedException e) {
				System.out.println("Exception");	
			}
		inUse=true;
	}
	
	public synchronized void relinquish() {
		inUse=false;
		notify();	
	}		
}