!7

p {
  cleanUp_interruptThreads = true;
  
  O o = hotwire(#1008275);
  callMainInNewThread(o);
  sleep(500);
  print(l(registeredThreads(o)));
  while (l(registeredThreads(o)) < 3) sleep(10);
  assertEquals(3, l(registeredThreads(o)));
  cleanUp(o);
  sleep(500);
  print(l(registeredThreads(o)));
  while (l(registeredThreads(o)) > 0) sleep(10);
  print("OK!");
}