code: public static void assertIOThread(Thread t, boolean flag) {
          if (flag) {
              assert t.equals(Thread.currentThread()) : "Management NOT on IO thread when expected";  // XXX testing
          } else {
              assert !(t.equals(Thread.currentThread())) : "Management on IO thread when not expected";  // XXX testing
          }
      }
docs: means we expect that we are NOT.