global {
    object event;
    number value;
}

class Producer extends Thread {
    function run() {
        while( true ) {            
            value = 10;
            event.signal();
        }
    }
}
class Consumer extends Thread {
    function run() {
        while( true ) {
            event.wait();
            Console.println( "value: $value" );
        }
    }
}

object producer = new Producer();
object consumer = new Consumer();
event = new Event();

producer.start();
consumer.start();