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What are the minimal blocking primitives in Linux

What are the minimal blocking primitives in linux. I know about futex_waitand futex_wake. But futexes can be used for signaling in addition to blocking. What is the minimum fixing primitive and where can I find it in the glibc library? Secondly, are condition variables also based on futexes?

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Read various docs on futex -es, including futex (2) and futex (7) man pages. You will find out that pthread lock primitives are implemented with a mixture of futexes and build code (by doing things not visible in portable C99)

(as I said in the comment)

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