Question

Which interrupt establishes a priority over the various sources to determine which request should be entertained first ?
A. Polling
B. Daisy chaining
C. Priority interrupt
D. All of above

Answer 1

The answer is the option (c). Priority interrupt.

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Answer 2

Option c) Priority Interrupt

Explanation:

• In every operating system, to increase the efficiency and the utilization of the CPU, the CPU's participation is minimized to the maximum extent with regard to I/O instructions so as to oversee the functioning when signalled.
• When an I/O device is ready for its transfer, it sends a signal to the CPU which must suspend the currently executing instruction and must move forward the control to execute the service request.
• The problem arises when multiple devices request control at the same time.
• This is the situation when the requests must be prioritized. In order to do so, we use the concept of priority interrupt.
• This can be done in two methods: Software (Polling) and Hardware (Daisy Chaining).