Method yield

src/main/java/field/app/ThreadSync.java:114–147

(Object o)

    }

    static public Object yield(Object o) throws InterruptedException, Stop {
        if (fiber.get() == null)
            throw new IllegalArgumentException(" yield called from non-fiber thread");

        fiber.get().debugStatus = "yield from " + Arrays.asList(new Exception().getStackTrace());

        if (fiber.get().stopped) throw new Stop();
        if (o == null) o = NULL;

        try {
            fiber.get().output.put(o);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        if (fiber.get().stopped) throw new Stop();

        Object t = null;
        try {
            t = fiber.get().input.take();
        } catch (InterruptedException e) {
            e.printStackTrace();
            try {
                t = fiber.get().input.take();
                System.out.println(" recovered with :" + t);
            } catch (InterruptedException e1) {
                e1.printStackTrace();
                System.err.println(" -- giving up --");
            }
        }

        if (fiber.get().stopped) throw new Stop();
        return t == NULL ? null : t;
    }

    static public void leave(Object o) throws InterruptedException, Stop {
        if (fiber.get() == null)