Implement dsync for cancelable locking primitives#30

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LukeShu wants to merge 5 commits intomasterfrom

Commits on Nov 1, 2021

Keep the tools in `tools/src/*/` rather than `.circleci/*.d/`
LukeShu
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Commits on Nov 2, 2021

Commits on Nov 3, 2021

dsync: Improve mutex performance
LukeShu
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