Add option to use futex APIs for `spinlock`#149

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BurningEnlightenment wants to merge 1 commit intoefficient:masterfrom BurningEnlightenment:dev/cxx20_spinlocks

+44-5

Commits on Jul 7, 2022

Add option to use futex APIs for spinlock

BurningEnlightenment
and
milianw
committed