// We're hitting 255 machines in parallel :)
// Returns list of found aware machines

static bool empBlast_verbose;

static L<S> empBlast() {
  ret empBlast(f isAware);
}

static L<S> empBlast(fO checkPeer) {
  final L<S> l = synchroList();
  new L<Thread> threads;
  S ip = getMyIP();
  int i = ip.lastIndexOf('.');
  if (i < 0) ret l;
  S net = substring(ip, 0, i+1);
  L<S> myIPs = myIPs();
  print("EMP-BLASTING " + net + "*");
  for (int n = 1; n <= 255; n++) {
    fS peer = net + n;
    if (!myIPs.contains(peer)) {
      S msg = "Peer Scan " + peer;
      threads.add(startThread(msg, r {
        bool yes = false;
        try {
          yes = isTrue(callF(checkPeer, peer));
          if (yes) l.add(peer);
        } finally {
          if (empBlast_verbose) print(peer + ": " + (yes ? "Yes" : "No (or timeout)"));
        }
      }));
    }
  }
  waitForThreads(threads);
  ret l;
}