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Refactor sync::Once#65719

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bors merged 12 commits intorust-lang:masterrust-lang/rust:masterfrom

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Nov 10, 2019

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Commits on Oct 23, 2019

• Rename state to state_and_queue

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• Simplify loop conditions in RUNNING and add comments

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• Don't mutate waiter nodes

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Commits on Oct 24, 2019

• Turn Finish into WaiterQueue

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• Move thread parking to a seperate function

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• Reduce the amount of comments in call_inner

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• In Waiter use interior mutability for thread

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• Use more precise atomic orderings

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• Always align Waiter to 4 bytes

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Commits on Oct 25, 2019

• Mention park guarantee

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Commits on Nov 5, 2019

• Don't mutate node.next

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Commits on Nov 9, 2019

• Run rustfmt on libstd/sync/once.rs

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