TF_SEND_CWR
tp->t_flags |= TF_SEND_CWR;
tp->t_flags |= TF_SEND_CWR;
tp->t_flags |= TF_SEND_CWR;
(tp->t_flags & TF_SEND_CWR)) {
tp->t_flags &= ~TF_SEND_CWR;
tp->t_flags |= TF_SEND_CWR;