if (remainingNanos < SPIN_THRESHOLD_NANOS) {
                // Remove the waiter, one way or another we are done parking this thread.
                removeWaiter(node);
                break long_wait_loop; // jump down to the busy wait loop
              }
            }
          }
          oldHead = waiters; // re-read and loop.
        } while (oldHead != Waiter.TOMBSTONE);
      }

  }

  private void assertNoExpectedFailures() {
    assertWithMessage("executor was shut down")
        .that(shutdownAndAwaitTermination(executor, 10, SECONDS))
        .isTrue();
    assertWithMessage("closingExecutor was shut down")
        .that(shutdownAndAwaitTermination(closingExecutor, 10, SECONDS))
        .isTrue();
    if (!failures.isEmpty()) {

  }

  private void assertNoExpectedFailures() {
    assertWithMessage("executor was shut down")
        .that(shutdownAndAwaitTermination(executor, 10, SECONDS))
        .isTrue();
    assertWithMessage("closingExecutor was shut down")
        .that(shutdownAndAwaitTermination(closingExecutor, 10, SECONDS))
        .isTrue();
    if (!failures.isEmpty()) {