rt-thread/examples/kernel/thread_yield.c

/*
 * 程序清单：
 */
#include <rtthread.h>
#include "tc_comm.h"

/* 指向线程控制块的指针 */
static rt_thread_t tid1 = RT_NULL;
static rt_thread_t tid2 = RT_NULL;
/* 线程1入口 */
static void thread1_entry(void* parameter)
{
	rt_uint32_t count = 0;

	while (1)
	{
		/* 打印线程1的输出 */
		rt_kprintf("thread1: count = %d\n", count ++);

		/* 执行yield后应该切换到thread2执行 */
		rt_thread_yield();
	}
}

/* 线程2入口 */
static void thread2_entry(void* parameter)
{
	rt_uint32_t count = 0;

	while (1)
	{
		/* 打印线程2的输出 */
		rt_kprintf("thread2: count = %d\n", count ++);

		/* 执行yield后应该切换到thread1执行 */
		rt_thread_yield();
	}
}

int thread_yield_init()
{
	/* 创建线程1 */
	tid1 = rt_thread_create("thread",
		thread1_entry, RT_NULL, /* 线程入口是thread1_entry, 入口参数是RT_NULL */
		THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
	if (tid1 != RT_NULL)
		rt_thread_startup(tid1);
	else
		tc_stat(TC_STAT_END | TC_STAT_FAILED);

	/* 创建线程2 */
	tid2 = rt_thread_create("thread",
		thread2_entry, RT_NULL, /* 线程入口是thread2_entry, 入口参数是RT_NULL */
		THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
	if (tid2 != RT_NULL)
		rt_thread_startup(tid2);
	else
		tc_stat(TC_STAT_END | TC_STAT_FAILED);

	return 0;
}

#ifdef RT_USING_TC
static void _tc_cleanup()
{
	/* 调度器上锁，上锁后，将不再切换到其他线程，仅响应中断 */
	rt_enter_critical();

	/* 删除线程 */
	if (tid1 != RT_NULL && tid1->stat != RT_THREAD_CLOSE)
		rt_thread_delete(tid1);
	if (tid2 != RT_NULL && tid2->stat != RT_THREAD_CLOSE)
		rt_thread_delete(tid2);

	/* 调度器解锁 */
	rt_exit_critical();

	/* 设置TestCase状态 */
	tc_done(TC_STAT_PASSED);
}

int _tc_thread_yield()
{
	/* 设置TestCase清理回调函数 */
	tc_cleanup(_tc_cleanup);
	thread_yield_init();

	/* 返回TestCase运行的最长时间 */
	return 30;
}
/* 输出函数命令到finsh shell中 */
FINSH_FUNCTION_EXPORT(_tc_thread_yield, a thread yield example);
#else
/* 用户应用入口 */
int rt_application_init()
{
	thread_yield_init();

	return 0;
}
#endif