Kernel

RT-Thread 同优先级轮询出现问题

发布于 2015-03-13 10:35:43 浏览：2674 订阅该版

版本：RT-Thread 1.2.0
各位好，我对rt_thread的同一优先级下时间片轮训调度的输出结果有点不解，请帮我分析一下。
过程如下：我创建了两个线程，优先级一样，时间片也一样。
然后循环打印出串口信息：
```static rt_thread_t Thread1;
static rt_thread_t Thread2;

static void hook(rt_thread_t from,rt_thread_t to)
{
	rt_kprintf("
<%s->%s>
",from->name,to->name);
}

static void rt_ThreadTest(void *parameter)
{
	while(1)
	{
		rt_kprintf("thread 1 put
");
		
//		rt_thread_yield();
	}
}
static void rt_ThreadTest2(void *parameter)
{
	while(1)
	{
		rt_kprintf("thread 2 put
");
//		rt_thread_yield();
	}
}

int rt_application_init()
{	
	Thread1=rt_thread_create("Thread1",
	                        rt_ThreadTest,RT_NULL,
													2048,10,5);
	if(Thread1!=RT_NULL)
	{
		rt_thread_startup(Thread1);
	}
	else
	{
		rt_kprintf("Thread1 create fail!
");
	}
	
	Thread2=rt_thread_create("Thread2",
	                         rt_ThreadTest2,RT_NULL,
														2048,10,5);
	if(Thread2!=RT_NULL)
	{
		rt_thread_startup(Thread2);
	}
	else
	{
		rt_kprintf("Thread 2 create fail
");
	}
    return 0;
}```
我打开了调度器的调试模式，于是输出如下：
![11.png](/uploads/6586_dc3c47b3e69999818a8c90d789082922.png)
![12.png](/uploads/6586_fcf2efc0e29f053881fa772cb2501d67.png)
![13.png](/uploads/6586_334d85277da920345a786b478f65a3d8.png)

可以看到在第三张图片中,线程2切换到线程1出现了问题,线程一的SP都不对了