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A comment on Mutexes are faster than Spinlocks. Parent comment

Re:Mutexes are faster than Spinlocks by the8472 on Saturday January 04, 2020 @12:55PM (#21956264)
Right, there's UMWAIT[0] for that, but that's quite new.

[0] https://www.felixcloutier.com/x86/umwait

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