C语言

#include<stdio.h>
#include<cstdio>
volatile unsigned int TimeOut ;
unsigned int cnt = 0;

//使用volatile变量情景：
//1、中断
//2、多线程
//3、寄存器

void isr_handle(int a)
{
	cnt++;
	if (cnt > 100)
	{
		TimeOut = 1;
		cnt = 0;

		printf("cnt = %d\n", cnt);
	}
	printf("123 cnt = %d\n", cnt);
}



extern unsigned int TimeOut;

int main(int argc, char *argv[])
{
	while (TimeOut != 1)
	{
		printf("hello\n");
	}

	return 0;
}