returnValue += listenerLatch.getCount();
      }
      list.execute();
      returnValue += listenerLatch.getCount();
    }
    return returnValue;
  }

  @Benchmark
  int executeThenAdd_singleThreaded(int reps) {
    int returnValue = 0;
    for (int i = 0; i < reps; i++) {
      list = impl.newExecutionList();
      list.execute();
      listenerLatch = new CountDownLatch(numListeners);