private void signalNoAcks(){
  lock.lock();
  try {
    allAcksRcvCond.signalAll();
  }
  finally {
    lock.unlock();
  }
}

private void signalNoAcks ( ) { lock . lock ( ) ; try { allAcksRcvCond . signalAll ( ) ; } finally { lock . unlock ( ) ; } }
signal that currenlty there are no more pending acks .
