RT-Thread API参考手册  3.1.1
嵌入式实时操作系统

关闭中断进行全局变量的访问 更多...

关闭中断进行全局变量的访问

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:关闭中断进行全局变量的访问 */
#include <rthw.h>
#include <rtthread.h>
#define THREAD_PRIORITY 20
#define THREAD_STACK_SIZE 512
#define THREAD_TIMESLICE 5
/* 同时访问的全局变量 */
static rt_uint32_t cnt;
void thread_entry(void *parameter)
{
rt_uint32_t level;
no = (rt_uint32_t) parameter;
while (1)
{
/* 关闭中断 */
cnt += no;
/* 恢复中断 */
rt_kprintf("protect thread[%d]'s counter is %d\n", no, cnt);
rt_thread_mdelay(no * 10);
}
}
int interrupt_sample(void)
{
rt_thread_t thread;
/* 创建thread1线程 */
thread = rt_thread_create("thread1", thread_entry, (void *)10,
THREAD_STACK_SIZE,
THREAD_PRIORITY, THREAD_TIMESLICE);
if (thread != RT_NULL)
/* 创建thread2线程 */
thread = rt_thread_create("thread2", thread_entry, (void *)20,
THREAD_STACK_SIZE,
THREAD_PRIORITY, THREAD_TIMESLICE);
if (thread != RT_NULL)
return 0;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(interrupt_sample, interrupt sample);