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Apple Software Engineer Interview Question (student candidate)

I interviewed in Cupertino, CA and was asked:
"Create a synchronization primitive for the operating system/kernel from scratch. I created a spinlock with test-and-set. Next, create a primitive that doesn't waste CPU cycles. (Essentially, how would you create a mutex inside the kernel?)"
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Part of a Software Engineer Interview Review - one of 2,289 Apple Interview Reviews

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