RT-Thread-RT-Thread 入门学习笔记 - 创建无法删除的线程RT-Thread问答社区

RT-Thread 入门学习笔记 - 创建无法删除的线程

发布于 2021-03-12 09:07:08 浏览：738 订阅该版

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[RT-Thread 入门学习笔记 - 目录](https://club.rt-thread.org/ask/article/3420.html)

## 前言

- 学习了RT-Thread的内核组件与线程管理，我忽然发现，线程创建时，名字可以使用RT_NULL。

- 创建无名线程，工作正常，只是，无法删除

## 相关代码

```c
#include <rtthread.h>

#define DBG_SECTION_NAME    "noname"
#define DBG_LEVEL           DBG_LOG
#include <rtdbg.h>

/* led test */
extern void led_red_on(void);
extern void led_red_off(void);
extern void led_grn_on(void);
extern void led_grn_off(void);
extern void led_blu_on(void);
extern void led_blu_off(void);

/* no name thread1 */
static void no_name_task1(void* param)
{
    LOG_D("no name thread1 start!\n");

while (1)
    {
        led_red_on();
        rt_thread_mdelay(2000);
        led_red_off();
        rt_thread_mdelay(2000);
    }
}

/* no name thread2 */
static void no_name_task2(void* param)
{
    LOG_D("no name thread2 start!\n");

while (1)
    {
        led_blu_on();
        rt_thread_mdelay(3000);
        led_blu_off();
        rt_thread_mdelay(3000);
    }
}

/* no name thread3 */
static void no_name_task3(void* param)
{
    LOG_D("no name thread3 start!\n");

while (1)
    {
        led_grn_on();
        rt_thread_mdelay(4000);
        led_grn_off();
        rt_thread_mdelay(4000);
    }
}

void no_name_init(void)
{
    rt_thread_t tid;

tid = rt_thread_create(RT_NULL, no_name_task1, RT_NULL, 2048, 28, 50);
    rt_thread_startup(tid);

tid = rt_thread_create(RT_NULL, no_name_task2, RT_NULL, 2048, 28, 50);
    rt_thread_startup(tid);

tid = rt_thread_create(RT_NULL, no_name_task3, RT_NULL, 2048, 28, 50);
    rt_thread_startup(tid);
}

void no_name_del(void)
{
    rt_thread_t tid;

tid = rt_thread_find(RT_NULL);
    if (tid != RT_NULL)
    {
        rt_thread_delete (tid);
    }
    else
    {
        LOG_D("Not find thread!");
    }
}

MSH_CMD_EXPORT(no_name_init, no_name_init);
MSH_CMD_EXPORT(no_name_del, no_name_del);
```

```c
msh >no_name_init
msh >[D/noname] no name thread1 start!

[D/noname] no name thread2 start!

[D/noname] no name thread3 start!

msh >list_thread
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---                                                                               "        28  suspend 0x0000007c 0x00000800    07%   0x0000002e 000                                                                                 "        28  suspend 0x0000007c 0x00000800    07%   0x0000002e 000                                                                                 "        28  suspend 0x0000007c 0x00000800    07%   0x0000002e 000
pms       28  suspend 0x0000009c 0x00000800    07%   0x0000002f 000
tshell    20  running 0x00000084 0x00001000    12%   0x00000005 000
serial    25  suspend 0x00000088 0x00000400    13%   0x0000000a 000
tidle0    31  ready   0x00000080 0x00000800    06%   0x00000016 000
timer      4  suspend 0x00000060 0x00000200    18%   0x00000009 000
msh >

msh >no_name_del
[D/noname] Not find thread!

```

## 解读

- 之所能创建无名的线程，因为内核对象初始化时，并不判断name的长度

- 之所无法删除没有名字的线程，是因为内核对象的查找，是用名字来查找的。

## 总结

- 需要继续研究RT-Thread内核代码、线程管理代码，正确使用RT-Thread

- 加深基础理论知识的积累。