/*
 * @(#)Lecture9.java 1.0 04/03/31
 *
 * You can modify the template of this file in the
 * directory ..\JCreator\Templates\Template_1\Project_Name.java
 *
 * You can also create your own project template by making a new
 * folder in the directory ..\JCreator\Template\. Use the other
 * templates as examples.
 *
 */
package myprojects.lecture9;


class Lecture9 {
	static boolean goOn = true;

	public static void main(String args[]) {
		Buffer b = new Buffer();
		Thread w1 = new Thread( new Writer(b, 0,2) );
		Thread w2 = new Thread( new Writer(b, 1,2) );
		Thread r =  new Thread( new Reader(b) );
		w1.start();
		w2.start();
		r.start();
		try{Thread.sleep(2000);}catch(Exception o){};
		goOn = false;

		System.out.println("done");
		System.exit(1);
	}
}

class Buffer {
	int buf;

	boolean empty = true;

	synchronized void insert(int i){
		while (! empty){ try{this.wait();}catch(InterruptedException ie){} };
		buf = i;
		empty = false;
		this.notifyAll();
	}

	synchronized int get(){
		while (empty){ try{this.wait();}catch(InterruptedException ie){} }
		empty = true;
		int res = buf;
		this.notifyAll();
		return res;
	}

}

class Reader implements Runnable {
	Buffer b;
	Reader(Buffer b){
		this.b=b;
	}

	public void run(){
		while(Lecture9.goOn){
			System.out.print(b.get() + ", ");
		}
	}
}

class Writer implements Runnable {
	int counter, step;
	Buffer b;
	Writer(Buffer b, int init, int st){
		this.b = b;
		counter = init;
		step = st;
	}

	public void run(){
		while(Lecture9.goOn){
			b.insert(counter);
			counter += step;
		}
	}
}