2. 计算机
  3. An operating system also has to be able to service peripheral(1)，such as timers，motors，sensors，communication devices，disks，etc．A

An operating system also has to be able to service peripheral(1)，such as timers，motors，sensors，communication devices，disks，etc．A

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问题 An operating system also has to be able to service peripheral(1)，such as timers，motors，sensors，communication devices，disks，etc．All of those can request the attention of the OS(2)，i．e．at the time that they want to use the 0S，the OS has to make sure it’s ready to service the requests．Such a request for attention is called an interrupt．There are two kinds of interrupts：Hardware interrupts and Software interrupts．The result of an interrupt is also a triggering of the processor,SO that it jumps to a  (3) address．Examples of cases where software interrupts appear are perhaps a divide by zero，a memory segmentation fault，etc．So this kind of interrupt is not caused by a hardware event but by a specific machine language operation code．Many systems have more than one hardware interrupt line，and the hardware manufacturer typically assembles all these interrupt lines in an interrupt(4)．An Interrupt(5) is a piece of hardware that shields the OS from the electronic details of the interrupt lines，SO that interrupts can be queued and none of them gets lost．
(2)应填_________
选项 A、synchronously
B、asynchronously
C、simultaneously
D、directly
答案B
解析
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