code: public void unregisterRootDirectory(
              final Path pToBeUnregistered,
              final WatchedDirectory pWatchedDirectory) {
          unregisterRootDirectory(manager.getDefaultDispatcher(), pToBeUnregistered, pWatchedDirectory);
      }
docs: This method is <em>not</em> thread-safe and must be synchronized externally.
  
  @param pWatchedDirectory