九、中断1、中断的概念计算机是高速工作的电子机器,它不但可以处理若干内存中的数据,还可以与外部世界通过输入/输出设备交换信息。当CPU正在运行一段程序时,可能会收到外部世界的请求,要求它暂时中断正在运行的程序而去处理外部事务。这时只要CPU乐于助人,就会马上停止自己手上的工作而去帮助别人——处理外部事务。一旦处理完外部事务之后,CPU就立即返 Interrupts 1, the concept of interruption Computer is a high-speed electronic work machines, it can not only deal with a number of in-memory data, but also with the outside world through the input / output devices to exchange information. When the CPU is running a program, it may receive a request from the outside world asking it to temporarily interrupt the running program to handle external transactions. At this moment, as long as the CPU is helpful, it will immediately stop the work in your hands to help others - to deal with external affairs. Once processed external affairs, the CPU will immediately return