中断

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2023-12-01

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 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); }}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) rt_thread_startup(thread); /* 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) rt_thread_startup(thread); return 0;}/* 导出到 msh 命令列表中 */MSH_CMD_EXPORT(interrupt_sample, interrupt sample);