TWS_BUSY_Q
tws_q_remove_request(sc, req, TWS_BUSY_Q);
tws_q_remove_request(sc, req, TWS_BUSY_Q);
req = tws_q_remove_tail(sc, TWS_BUSY_Q);
req = tws_q_remove_tail(sc, TWS_BUSY_Q);
tws_q_insert_tail(sc, req, TWS_BUSY_Q);