GlobDeltaMacAddrsMutex.Lock();

    if(GlobNewDeltaMacAddrs) {
        for(i = 0 ; i < GlobDeltaMacAddrs.size() ; i++ ) {
            .... do stuff
        }
        GlobNewDeltaMacAddrs = false;
    }
    GlobDeltaMacAddrsMutex.Unlock();