@Override
    public int capacity()
    {
        return (int) (mask + 1);
    }
Common functionality for array backed queues. The class is pre-padded and the array is padded on either side to help
with False Sharing prevention. It is expected that subclasses handle post padding.
jctools-core/src/main/java/org/jctools/queues/ConcurrentCircularArrayQueue.java