long nowMicros = stopwatch.readMicros();
      if (!canAcquire(nowMicros, timeoutMicros)) {
        return false;
      } else {
        microsToWait = reserveAndGetWaitLength(permits, nowMicros);
      }
    }
    stopwatch.sleepMicrosUninterruptibly(microsToWait);
    return true;
  }

  private boolean canAcquire(long nowMicros, long timeoutMicros) {