关闭中断过程中是否会发生中断丢失

  一直有一个疑问，就是如果在关闭中断期间有新的中断到达，新中断是会被丢弃还是会在当前中断结束后立即响应？

  答案是后者。

  下面摘自http://linux.linti.unlp.edu.ar/images/0/0c/ULK3-CAPITULO4-UNNOBA.pdf （需要）

  The PIC can be told to stop issuing interrupts that refer to a given IRQ line, or to 
resume issuing them. 
  ●Disabled interrupts are not lost; the PIC sends them to the CPU as soon as they are 
enabled again. 

  ●This feature is used by most interrupt handlers, because it allows them to process 
IRQs of the same type serially.