thread pause

class Data {
    private static int value = 0;
    public static synchronized int getValue() {
        return value;
    }

    public static synchronized void setValue(int value) {
        this.value = value;
    }
}

class Simulator extends Thread {
    private void waitIfNotAllowed() {
                if (Data.getValue() == 1) {
                    Data.setValue(2);
                    while (Data.getValue() != 0) {
                        sleep(3000);
                    }
                }
    }

    public void run() {
        try {
            while (true) {
                waitIfNotAllowed();
                doSomething();
            }
        } catch(Exception ex) {
            LOG.error(null, ex);
        }
    }
}

class Scheduler extends Thread {
    private void pauseThread() {
        Data.setValue(1);

        while (Data.getValue() != 2) {
            sleep(3000);
        }
    }

    private void continueThread() {
        Data.setValue(0);
    }

    public void run() {
        try {
            while (true) {
                doSomething();
                if (...) {
                    pauseThread();
                    doSpecialThing();
                    continueThread();
                }
                doSomething();
            }
        } catch(Exception ex) {
            LOG.error(null, ex);
        }
    }
}