RT-Thread 时间片示例问题

发布于 2020-07-29 16:41:05 浏览：1553 订阅该版

硬件：stm32
软件：hal库

用的官方的demo，发现把源码的优先级调整到10以下后，时间片就不起作用了，只会先做完线程1再做线程2.代码如下：

```c
#include <rtthread.h>

#define THREAD_STACK_SIZE	1024
#define THREAD_PRIORITY	    5
#define THREAD_TIMESLICE    10

/* 线程入口 */
static void thread_entry(void* parameter)
{
    rt_uint32_t value;
    rt_uint32_t count = 0;

value = (rt_uint32_t)parameter;
    while (1)
    {
        if(0 == (count % 5))
        {           
            rt_kprintf("thread %d is running ,thread %d count = %d\n", value , value , count);

if(count > 200)
                return;            
        }
         count++;
     }  
}

int timeslice_sample(void)
{
    rt_thread_t tid;
    /* 创建线程1 */
    tid = rt_thread_create("thread1", 
                            thread_entry, (void*)1, 
                            THREAD_STACK_SIZE, 
                            THREAD_PRIORITY, THREAD_TIMESLICE); 
    if (tid != RT_NULL) 
        rt_thread_startup(tid);

/* 创建线程2 */
    tid = rt_thread_create("thread2", 
                            thread_entry, (void*)2,
                            THREAD_STACK_SIZE, 
                            THREAD_PRIORITY, THREAD_TIMESLICE-5);
    if (tid != RT_NULL) 
        rt_thread_startup(tid);
    return 0;
}

/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(timeslice_sample, timeslice sample);
```
![image.png](/uploads/20200729/4a5a3f18003102d00546e58152e56213.png)