sched: add support for scheduling functions to be executed later

sched/runqueue.c

@@ -61,3 +61,22 @@ struct runqueue *cpu_rq(unsigned int cpu)
 
 	return rq;
 }
+
+void rq_remove_thread(struct runqueue *rq, struct thread *thr)
+{
+	int prio = thread_priority(thr);
+	if (prio < 0 || prio > PRIO_MAX) {
+		return;
+	}
+
+	struct queue *q = &rq->rq_queues[prio];
+	queue_delete(q, &thr->tr_rqentry);
+
+	if (rq->rq_nthreads > 0) {
+		rq->rq_nthreads--;
+	}
+
+	if (queue_empty(q)) {
+		rq->rq_readybits &= ~PRIO_MASK(prio);
+	}
+}