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What is the state of the buffer if it asked for data and cannot provide it?

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What is the state of the buffer if it asked for data and cannot provide it?

(a) overrun

(b) underrun

(c) remains unchanged

(d) beyond overrun

The question was posed to me in semester exam.

My question comes from Buffers in portion Buffering and other Data Structures of Embedded Systems

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Right answer is (b) underrun

To explain: The buffer is said to be overrun if the buffer cannot accept any more data and said to be underrun if it asked for data but not able to provide it.

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