code: public void removeFromInUse(Object buffer) {
          if (inUseTable != null) {
              if (null == buffer) {
                  throw new NullPointerException();
              }
              inUseTable.remove(buffer);
          }
      }
docs: Remove a buffer from the InUse pool. To be used when the buffer
  should be removed without waiting for the release logic to remove it.
  
  @param buffer to be released.