本程序实现小写字符转换为大写字符的功能 希望对有需要的同学有所帮助-This procedure to achieve lower-case characters converted to uppercase characters in the function want to help needy students
函数对时钟中断请求进行真正的服务,而不是只是让CPU“空跑”一趟。此时,Linux内核可以说是真正的“跳动”起来了。-Function provide real service for the timer inturrupt instead of letting CPU nop, thereby the Linux kernel "jump" in a sense.