rt_thread_suspend应该允许挂起当前线程和其他线程

发布于 2023-12-25 18:46:13 浏览：480 订阅该版

目前在使用的是lts-v4.1.x分支的V4.1.1版本。
有2个任务A、B，B在特殊情况下需要将A任务挂起，于是便在B线程中年调用rt_thread_suspend(A_thread_id)，竟发现断言错误，查看源码发现这里的断言只允许挂起自己，这么做的限制是什么呢？
```c
/**
 * @brief   This function will suspend the specified thread and change it to suspend state.
 *
 * @note    This function ONLY can suspend current thread itself.
 *              rt_thread_suspend(rt_thread_self());
 *
 *          Do not use the rt_thread_suspend to suspend other threads. You have no way of knowing what code a
 *          thread is executing when you suspend it. If you suspend a thread while sharing a resouce with
 *          other threads and occupying this resouce, starvation can occur very easily.
 *
 * @param   thread is the thread to be suspended.
 *
 * @return  Return the operation status. If the return value is RT_EOK, the function is successfully executed.
 *          If the return value is any other values, it means this operation failed.
 */
rt_err_t rt_thread_suspend(rt_thread_t thread)
{
    rt_base_t stat;
    rt_base_t level;

/* parameter check */
    RT_ASSERT(thread != RT_NULL);
    RT_ASSERT(rt_object_get_type((rt_object_t)thread) == RT_Object_Class_Thread);
    RT_ASSERT(thread == rt_thread_self());
```
从论坛中查看到的资料，早期的rt-thread是只允许挂起其他线程，不允许挂起自己。
![suspend.png](https://oss-club.rt-thread.org/uploads/20231225/178df2e108c1c363cd4d2956e4173b6d.png.webp)