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A computer handles several interrupt sources of which of the following are relevant for this question.

  • Interrupt from CPU temperature sensor (raises interrupt if CPU temperature is too high)
  • Interrupt from Mouse (raises Interrupt if the mouse is moved or a button is pressed)
  • Interrupt from Keyboard (raises Interrupt if a key is pressed or released)
  • Interrupt from Hard Disk (raises Interrupt when a disk read is completed)
Which one of these will be handled at the HIGHEST priority?
  1. Interrupt from Hard Disk
  2. Interrupt from Mouse
  3. Interrupt from Keyboard
  4. Interrupt from CPU temperature sensor
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Answer should be (D) Higher priority interrupt levels are assigned to requests which, if delayed or interrupted,could have serious consequences. Devices with high speed transfer such as magnetic disks are given high priority, and slow devices such as keyboard receive low priority. We know that mouse pointer movements are more frequent than keyboard ticks. So its obvious that its data transfer rate is higher than keyboard. Delaying a CPU temperature sensor could have serious consequences, overheat can damage CPU circuitry. From the above information we can conclude that priorities are-

CPU temperature sensor > Hard Disk > Mouse > Keyboard

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