65 lines
1.1 KiB
C
65 lines
1.1 KiB
C
#include <tianole/sched.h>
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#include "sched.h"
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void wait_queue_init(struct wait_queue *queue)
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{
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if (queue == 0) {
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return;
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}
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queue->head = 0;
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queue->tail = 0;
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}
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static void wait_queue_enqueue(struct wait_queue *queue, struct thread *thread)
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{
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thread->wait_next = 0;
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if (queue->tail != 0) {
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queue->tail->wait_next = thread;
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} else {
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queue->head = thread;
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}
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queue->tail = thread;
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}
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void wait_queue_sleep(struct wait_queue *queue)
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{
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if (queue == 0 || current_thread == 0) {
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return;
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}
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wait_queue_enqueue(queue, current_thread);
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current_thread->state = THREAD_WAITING;
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sched_yield();
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}
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void wait_queue_wake_one(struct wait_queue *queue)
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{
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struct thread *thread;
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if (queue == 0 || queue->head == 0) {
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return;
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}
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thread = queue->head;
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queue->head = thread->wait_next;
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if (queue->head == 0) {
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queue->tail = 0;
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}
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thread->wait_next = 0;
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if (thread->state == THREAD_WAITING) {
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thread->state = THREAD_READY;
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}
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}
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void wait_queue_wake_all(struct wait_queue *queue)
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{
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while (queue != 0 && queue->head != 0) {
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wait_queue_wake_one(queue);
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}
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}
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