import java.util.*;
public class DataTC
{
    public static LinkedList TC;
    public DataTC()
    {
	TC=new LinkedList();
    }
  public synchronized void Produce(Object o)
    {
	TC.add(o);
	notifyAll();  
    }
    public synchronized Object Consume()
    {
	try
	    {
		if(TC.isEmpty())
		    {
			wait();
//			System.out.println("TC waiting");
		    }
		return TC.removeFirst();// else return the head of the que
	    }
	catch(Exception e)
	    {
		System.out.println("Error DataTC "+e);
		return null;
	    }
    }
    public synchronized void awake()
    {
	System.out.println("null produced");
	Produce(null);
    }
}