kernel-sample/interrupt_sample.c

/* 
 * 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 no;
    rt_uint32_t level;

    no = (rt_uint32_t) parameter;
    while (1)
    {
        /* 关闭中断 */
        level = rt_hw_interrupt_disable();
        cnt += no;
        /* 恢复中断 */
        rt_hw_interrupt_enable(level);

        rt_kprintf("protect thread[%d]'s counter is %d\n", no, cnt);
        rt_thread_mdelay(no * 10);
    }
}

/* 用户应用程序入口 */
int interrupt_sample(void)
{
    rt_thread_t thread;

    /* 创建t1线程 */
    thread = rt_thread_create("thread1", thread_entry, (void *)10,
                              THREAD_STACK_SIZE,
                              THREAD_PRIORITY, THREAD_TIMESLICE);
    if (thread != RT_NULL)
        rt_thread_startup(thread);


    /* 创建t2线程 */
    thread = rt_thread_create("thread2", thread_entry, (void *)20,
                              THREAD_STACK_SIZE,
                              THREAD_PRIORITY, THREAD_TIMESLICE);
    if (thread != RT_NULL)
        rt_thread_startup(thread);

    return 0;
}

/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(interrupt_sample, interrupt sample);