docs: public int fillAll(RingByteBuffer ring) throws IOException, InterruptedException
      {
          if (ring.marked() > capacity)
          {
              throw new IllegalArgumentException("marked > capacity");
          }
          fillLock.lock();
          try
          {
              fillSync.waitUntil(()->ring.marked()<=free());
              return fill(ring);
          }
          finally
          {
              fillLock.unlock();
          }
      }