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
#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);
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。