} finally {
        monitor.leave();
      }
    }

    void awaitHealthy(long timeout, TimeUnit unit) throws TimeoutException {
      monitor.enter();
      try {
        if (!monitor.waitForUninterruptibly(awaitHealthGuard, timeout, unit)) {
          throw new TimeoutException(
              "Timeout waiting for the services to become healthy. The "
                  + "following services have not started: "

   *
   * @return whether the guard is now satisfied
   * @since 28.0 (but only since 33.4.0 in the Android flavor)
   */
  public boolean waitForUninterruptibly(Guard guard, Duration time) {
    return waitForUninterruptibly(guard, toNanosSaturated(time), TimeUnit.NANOSECONDS);
  }

  /**
   * Waits for the guard to be satisfied. Waits at most the given time. May be called only by a