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175 líneas
4.3 KiB
175 líneas
4.3 KiB
#include <list.h>
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#include <sync.h>
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#include <proc.h>
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#include <sched.h>
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#include <stdio.h>
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#include <assert.h>
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#include <default_sched.h>
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// the list of timer
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static list_entry_t timer_list;
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static struct sched_class *sched_class;
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static struct run_queue *rq;
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static inline void
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sched_class_enqueue(struct proc_struct *proc) {
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if (proc != idleproc) {
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sched_class->enqueue(rq, proc);
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}
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}
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static inline void
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sched_class_dequeue(struct proc_struct *proc) {
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sched_class->dequeue(rq, proc);
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}
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static inline struct proc_struct *
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sched_class_pick_next(void) {
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return sched_class->pick_next(rq);
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}
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static void
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sched_class_proc_tick(struct proc_struct *proc) {
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if (proc != idleproc) {
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sched_class->proc_tick(rq, proc);
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}
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else {
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proc->need_resched = 1;
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}
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}
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static struct run_queue __rq;
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void
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sched_init(void) {
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list_init(&timer_list);
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sched_class = &default_sched_class;
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rq = &__rq;
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rq->max_time_slice = MAX_TIME_SLICE;
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sched_class->init(rq);
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cprintf("sched class: %s\n", sched_class->name);
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}
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void
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wakeup_proc(struct proc_struct *proc) {
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assert(proc->state != PROC_ZOMBIE);
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bool intr_flag;
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local_intr_save(intr_flag);
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{
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if (proc->state != PROC_RUNNABLE) {
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proc->state = PROC_RUNNABLE;
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proc->wait_state = 0;
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if (proc != current) {
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sched_class_enqueue(proc);
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}
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}
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else {
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warn("wakeup runnable process.\n");
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}
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}
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local_intr_restore(intr_flag);
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}
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void
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schedule(void) {
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bool intr_flag;
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struct proc_struct *next;
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local_intr_save(intr_flag);
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{
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current->need_resched = 0;
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if (current->state == PROC_RUNNABLE) {
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sched_class_enqueue(current);
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}
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if ((next = sched_class_pick_next()) != NULL) {
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sched_class_dequeue(next);
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}
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if (next == NULL) {
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next = idleproc;
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}
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next->runs ++;
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if (next != current) {
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proc_run(next);
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}
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}
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local_intr_restore(intr_flag);
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}
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void
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add_timer(timer_t *timer) {
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bool intr_flag;
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local_intr_save(intr_flag);
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{
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assert(timer->expires > 0 && timer->proc != NULL);
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assert(list_empty(&(timer->timer_link)));
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list_entry_t *le = list_next(&timer_list);
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while (le != &timer_list) {
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timer_t *next = le2timer(le, timer_link);
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if (timer->expires < next->expires) {
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next->expires -= timer->expires;
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break;
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}
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timer->expires -= next->expires;
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le = list_next(le);
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}
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list_add_before(le, &(timer->timer_link));
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}
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local_intr_restore(intr_flag);
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}
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// del timer from timer_list
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void
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del_timer(timer_t *timer) {
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bool intr_flag;
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local_intr_save(intr_flag);
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{
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if (!list_empty(&(timer->timer_link))) {
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if (timer->expires != 0) {
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list_entry_t *le = list_next(&(timer->timer_link));
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if (le != &timer_list) {
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timer_t *next = le2timer(le, timer_link);
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next->expires += timer->expires;
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}
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}
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list_del_init(&(timer->timer_link));
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}
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}
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local_intr_restore(intr_flag);
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}
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// call scheduler to update tick related info, and check the timer is expired? If expired, then wakup proc
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void
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run_timer_list(void) {
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bool intr_flag;
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local_intr_save(intr_flag);
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{
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list_entry_t *le = list_next(&timer_list);
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if (le != &timer_list) {
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timer_t *timer = le2timer(le, timer_link);
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assert(timer->expires != 0);
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timer->expires --;
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while (timer->expires == 0) {
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le = list_next(le);
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struct proc_struct *proc = timer->proc;
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if (proc->wait_state != 0) {
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assert(proc->wait_state & WT_INTERRUPTED);
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}
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else {
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warn("process %d's wait_state == 0.\n", proc->pid);
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}
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wakeup_proc(proc);
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del_timer(timer);
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if (le == &timer_list) {
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break;
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}
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timer = le2timer(le, timer_link);
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}
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}
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sched_class_proc_tick(current);
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}
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local_intr_restore(intr_flag);
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}
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