public class SequintalConsistency {
    static volatile int r1;
    static volatile int r2;
    static CountDownLatch latch = new CountDownLatch(1);

    public static void main(String[] args) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    latch.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                r1 = 0;
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    latch.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                r2 = 0;
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    latch.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("r1=" + r1 + ", r2=" + r2);
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    latch.await();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("r1=" + r1 + ", r2=" + r2);
            }
        }).start();
        latch.countDown();
    }
}