关于rt_thread_self()函数的理解

发布于 2019-01-04 16:05:29 浏览：3094 订阅该版

* 本帖最后由 indoorsg 于 2019-1-4 16:05 编辑 *

```
``````rt_thread_t rt_thread_self(void)
{
#ifdef RT_USING_SMP
    rt_base_t lock;
    rt_thread_t self;

lock = rt_hw_local_irq_disable();
    self = rt_cpu_self()->current_thread;
    rt_hw_local_irq_enable(lock);
    return self;
#else
    extern rt_thread_t rt_current_thread;

return rt_current_thread;
#endif
}```
函数rt_thread_self()在内核中大量使用，其作用是获取当前运行线程的句柄。不过，其命名不够直接，无法做到顾名思义。参考FreeRTOS的做法，我认为可以使用rt_thread_find(NULL)的函数的形式来实现，修改后的rt_thread_find()代码如下：```rt_thread_t rt_thread_find(char *name)
{
    struct rt_object_information *information;
    struct rt_object *object;
    struct rt_list_node *node;

/* enter critical */
    if (rt_thread_self() != RT_NULL)
        rt_enter_critical();

/* get current thread */
    if (name == RT_NULL)
    {
        if (rt_thread_self() != RT_NULL)
            rt_exit_critical();

return rt_thread_self();
    }

/* try to find device object */
    information = rt_object_get_information(RT_Object_Class_Thread);
    RT_ASSERT(information != RT_NULL);
    for (node  = information->object_list.next;
         node != &(information->object_list);
         node  = node->next)
    {
        object = rt_list_entry(node, struct rt_object, list);
        if (rt_strncmp(object->name, name, RT_NAME_MAX) == 0)
        {
            /* leave critical */
            if (rt_thread_self() != RT_NULL)
                rt_exit_critical();

return (rt_thread_t)object;
        }
    }

/* leave critical */
    if (rt_thread_self() != RT_NULL)
        rt_exit_critical();

/* not found */
    return RT_NULL;
}```

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