void ConnectionPool::_cleanUpStaleHosts_inlock(Date_t now) { if (now > _lastCleanUpTime + kCleanUpInterval) { for (HostLastUsedMap::iterator itr = _lastUsedHosts.begin(); itr != _lastUsedHosts.end(); itr++) { if (itr->second <= _lastCleanUpTime) { ConnectionList connList = _connections.find(itr->first)->second; _cleanUpOlderThan_inlock(now, &connList); invariant(connList.empty()); itr->second = kNeverTooStale; } } _lastCleanUpTime = now; } }