thread_init_early

最新推荐文章于 2024-02-06 10:28:31 发布

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本文介绍了一个操作系统内核中线程系统的早期初始化过程。该过程包括设置优先级队列、初始化线程列表、创建引导线程并将其设置为运行状态等关键步骤。

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lk/kernel/thread.c:

thread_init_early:

/**
 * @brief  Initialize threading system
 *
 * This function is called once, from kmain()
 */
void thread_init_early(void)
{
    int i;
    DEBUG_ASSERT(arch_curr_cpu_num() == 0);
    /* initialize the run queues */
    for (i=0; i < NUM_PRIORITIES; i++)
        list_initialize(&run_queue[i]);
    /* initialize the thread list */
    list_initialize(&thread_list);
    /* create a thread to cover the current running state */
    thread_t *t = idle_thread(0);
    init_thread_struct(t, "bootstrap");
    /* half construct this thread, since we're already running */
    t->priority = HIGHEST_PRIORITY;
    t->state = THREAD_RUNNING;
    t->flags = THREAD_FLAG_DETACHED;
    thread_set_curr_cpu(t, 0);
    thread_set_pinned_cpu(t, 0);
    wait_queue_init(&t->retcode_wait_queue);
    list_add_head(&thread_list, &t->thread_list_node);
    set_current_thread(t);
}