TS_IFBLOCK
!(tp->t_state & TS_IFBLOCK) && q->q_count <= TTXOLO) {
!(tp->t_state & TS_IFBLOCK) && q->q_count <= TTXOLO) {
!(tp->t_state & TS_IFBLOCK) && q->q_count <= TTXOLO) {
if (tp->t_state & (TS_TBLOCK|TS_IFBLOCK)) {
tp->t_state &= ~(TS_TBLOCK|TS_IFBLOCK);
tp->t_state |= (TS_TBLOCK|TS_IFBLOCK);
tp->t_state &= ~(TS_TBLOCK|TS_IFBLOCK);