import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;

public class Barrier {
    static boolean running = true;

    static class Task2 implements Runnable {

        CyclicBarrier cbStart;
        
        CyclicBarrier cbdone;
        CountDownLatch cdl;

        Task2(CyclicBarrier cb, CyclicBarrier cb2, CountDownLatch cdl) {
            this.cdl = cdl;
            this.cbStart = cb;
            this.cbdone = cb2;
        }

        @Override
        public void run() {
            while (running) {
                try {
                    cbStart.await();
                
                    int var = 0;
                    for (int i = 0; i < 250; i++) {
                        var++;
                        Thread.sleep(1);
                    }


                    cbdone.await();
                } catch (InterruptedException | BrokenBarrierException e) {
                    e.printStackTrace();
                }
                
            }
            cdl.countDown();

        }
    }

    public static void main(String[] args) throws InterruptedException, BrokenBarrierException {
        int threads = 10;
        CyclicBarrier cbStart = new CyclicBarrier(threads+1);
        CyclicBarrier cbdone = new CyclicBarrier(threads + 1);
        CountDownLatch cdl = new CountDownLatch(threads);



        Thread[] ths = new Thread[threads];

        Task2 t = new Task2(cbStart, cbdone, cdl);
        for (int i = 0; i < threads; i++) {
            ths[i] = new Thread(t);
            ths[i].start();
        }

        for (int i = 0; i < 10; i++) {
            cbStart.await();
            System.out.println("Starter: "+(i+1));

            if (i == 9) running = false;

            cbdone.await();
            System.out.println("Ferdig:  " + (i + 1));
        }

        cdl.await();

        // Denne gjør det samme som cdl
        // for (Thread thread : ths) {
        //     thread.join();
        // }



        System.out.println("Alle er ferdige");


        
    }
}