在关中断状态，不可响应的中断是______。
- A.硬件中断
- B.软件中断
- C.不可屏蔽中断
- D.可屏蔽中断
正确答案及解析
正确答案
解析
中断是指计算机系统运行时，出现来自处理机以外的任何现行程序不知道的事件，CPU暂停现行程序，转去处理这些事件，待处理完毕，再返回原来的程序继续执行，这个过程称为中断。请求CPU中断的设备或事件称为中断源。根据中断源的不同类别，可以把中断分为内中断和外中断两种。由异步的外部事件引起的CPU改变程序执行流程的过程叫“外中断”或“硬中断”。由CPU内部原因而改变程序执行流程的过程称“内中断”、“软中断”或“异常”。为了便于控制中断请求信号的产生，也为了利用屏蔽码改变中断处理的优先级别，当产生中断请求后，用程序方式有选择地封锁部分中断，而允许其余部分中断仍得到响应，称为中断屏蔽。有些中断请求是不可屏蔽的，也就是说，不管中断系统是否开中断，这些中断源的中断请求一旦提出，CPU必须立即响应。所以，中断又分为可屏蔽中断和不可屏蔽中断。
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