sbool areWeOnline() {
  bool b = areWeOnline_impl();
  vmGeneralMap_set('areWeOnline, pair(sysNow(), b));
  ret b;
}

sbool areWeOnline_impl() {
  for (Pair<S, Int> p : returnCodesOfMultipleServers_parallel_iterator(defaultTimeoutForOnlineCheck(), defaultServersForOnlineCheck()))
    if (second(p) >= 0) true;
  false;
}