时间片调度

相同优先级线程按照时间片轮番调度 更多...

相同优先级线程按照时间片轮番调度

源码

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date Author Notes
 * 2018-08-24 yangjie the first version
 */

/*
* 程序清单：相同优先级线程按照时间片轮转调度
*
* 这个例子中将创建两个线程，每一个线程都在打印信息
*
*/

#include <rtthread.h>

#define THREAD_STACK_SIZE 1024
#define THREAD_PRIORITY 20
#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 = RT_NULL;
 /* 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);