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What is the main disadvantage of spinlocks?

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in Operating System by (102k points)
What is the main disadvantage of spinlocks?

(a) they are not sufficient for many process

(b) they require busy waiting

(c) they are unreliable sometimes

(d) they are too complex for programmers

The question was posed to me during an online exam.

I would like to ask this question from Semaphores topic in chapter Process Synchronization of Operating System

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Right option is (b) they require busy waiting

The explanation: None.

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