rt-thread优先级配置失效问题

/* get highest priority inside its taken object and its init priority */
rt_inline rt_uint8_t _thread_get_mutex_priority(struct rt_thread* thread)
{
    rt_list_t *node = RT_NULL;
    struct rt_mutex *mutex = RT_NULL;
    rt_uint8_t priority = thread->init_priority;

    rt_list_for_each(node, &(thread->taken_object_list))
    {
        mutex = rt_list_entry(node, struct rt_mutex, taken_list);
        rt_uint8_t mutex_prio = mutex->priority;
        /* prio at least be priority ceiling */
        mutex_prio = mutex_prio < mutex->ceiling_priority ? mutex_prio : mutex->ceiling_priority;

        if (priority > mutex_prio)
        {
            priority = mutex_prio;
        }
    }

    return priority;
}

这里获取优先级会使用线程的初始优先级，假设对一个已经创建好的线程使用了设置优先级的线程API，那么之后在使用线程锁的时候，由于rtthread的防止优先级翻转的机制，会导致当前线程的优先级重新变成线程的初始优先级。

Start at _thread_get_mutex_priority and inspect how thread->init_priority, runtime priority changes, and mutex priority inheritance interact. Reproduce the reported case by changing a created thread's priority before it takes a mutex, then verify that locking does not restore the initial priority and add or run the relevant kernel regression coverage if available.