code: private void destroyConnLinks() {
          synchronized (inUse) {
              int numlinks = inUse.size();
              for (int i = 0; i < numlinks; i++) {
                  inUse.removeFirst().destroy(null);
              }
          }
      }
docs: call the destroy on all the UDPConnLink objects related to this
  UDPChannel which are currently "in use".