rt_thread_resume()函数分析

发布于 2023-10-17 09:25:09 浏览：395 订阅该版

```c
/**
* This function will resume a thread and put it to system ready queue.
*
* @param thread the thread to be resumed
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*/
rt_err_t rt_thread_resume(rt_thread_t thread)
{
    register rt_base_t temp;
  /* 检查状态 */
    /* thread check */
    RT_ASSERT(thread != RT_NULL);
    RT_DEBUG_LOG(RT_DEBUG_THREAD, ("thread resume:  %s", thread->name));
    if ((thread->stat & RT_THREAD_STAT_MASK) != RT_THREAD_SUSPEND)
    {
        RT_DEBUG_LOG(RT_DEBUG_THREAD, ("thread resume: thread disorder, %d",
                                       thread->stat));
        return -RT_ERROR;
    }
  /* 关闭中断 */
    /* disable interrupt */
    temp = rt_hw_interrupt_disable();
  /* 将线程从挂起队列移除 */
    /* remove from suspend list */
    rt_list_remove(&(thread->tlist));
    rt_timer_stop(&thread->thread_timer);
  /* 打开中断 */
    /* enable interrupt */
    rt_hw_interrupt_enable(temp);
  /* 将线程插入到就绪队列 */
    /* insert to schedule ready list */
    rt_schedule_insert_thread(thread);
    RT_OBJECT_HOOK_CALL(rt_thread_resume_hook, (thread));
    return RT_EOK;
}
```
这个函数内部为什么要有从挂起队列里删除呀？没理解到，目前在看内核源码，也没看见介绍挂起队列是啥，还望大佬指点指点