public static void main(String[] args) {
        Lock lock = new ReentrantLock();

        lock.lock();

        try {
            TimeUnit.SECONDS.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }

}

protected final boolean compareAndSetState(int expect, int update) {
	return unsafe.compareAndSwapInt(this, stateOffset, expect, update);
}

public final boolean release(int arg) {
        if (tryRelease(arg)) {
            Node h = head;
            if (h != null && h.waitStatus != 0)
                unparkSuccessor(h);
            return true;
        }
        return false;
    }