NEXT_SLAVE
q = NEXT_SLAVE(prev);
NEXT_SLAVE(prev) = NEXT_SLAVE(q);
master->slaves = NEXT_SLAVE(q);
q->next = NEXT_SLAVE(m->slaves);
NEXT_SLAVE(m->slaves) = sch;
master->slaves = NEXT_SLAVE(q);
master->slaves = NEXT_SLAVE(q);
} while ((q = NEXT_SLAVE(q)) != start);
} while ((q = NEXT_SLAVE(q)) != m->slaves);
} while ((q = NEXT_SLAVE(q)) != m->slaves);