update name of code to labcodes

labcodes/lab6/kern/schedule/default_sched.c

@@ -0,0 +1,58 @@
+#include <defs.h>
+#include <list.h>
+#include <proc.h>
+#include <assert.h>
+#include <default_sched.h>
+
+static void
+RR_init(struct run_queue *rq) {
+    list_init(&(rq->run_list));
+    rq->proc_num = 0;
+}
+
+static void
+RR_enqueue(struct run_queue *rq, struct proc_struct *proc) {
+    assert(list_empty(&(proc->run_link)));
+    list_add_before(&(rq->run_list), &(proc->run_link));
+    if (proc->time_slice == 0 || proc->time_slice > rq->max_time_slice) {
+        proc->time_slice = rq->max_time_slice;
+    }
+    proc->rq = rq;
+    rq->proc_num ++;
+}
+
+static void
+RR_dequeue(struct run_queue *rq, struct proc_struct *proc) {
+    assert(!list_empty(&(proc->run_link)) && proc->rq == rq);
+    list_del_init(&(proc->run_link));
+    rq->proc_num --;
+}
+
+static struct proc_struct *
+RR_pick_next(struct run_queue *rq) {
+    list_entry_t *le = list_next(&(rq->run_list));
+    if (le != &(rq->run_list)) {
+        return le2proc(le, run_link);
+    }
+    return NULL;
+}
+
+static void
+RR_proc_tick(struct run_queue *rq, struct proc_struct *proc) {
+    if (proc->time_slice > 0) {
+        proc->time_slice --;
+    }
+    if (proc->time_slice == 0) {
+        proc->need_resched = 1;
+    }
+}
+
+struct sched_class default_sched_class = {
+    .name = "RR_scheduler",
+    .init = RR_init,
+    .enqueue = RR_enqueue,
+    .dequeue = RR_dequeue,
+    .pick_next = RR_pick_next,
+    .proc_tick = RR_proc_tick,
+};
+