Question

Which of the following determines the number of entries in the buffer?

(a) low water mark

(b) high water mark

(c) low and high water mark

(d) small and big water mark

The question was posed to me during an interview.

My question is from Types of Buffers in section Buffering and other Data Structures of Embedded Systems

Answer 1

Right choice is (a) low water mark

To explain: The number of entries below the low water mark determines the number of entries the buffer has and the amount of time which is available to fill the buffer before empties and the condition is known as underrun.