InitOnce: synchronize with completion when already complete#2641
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RalfJung
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Manishearth
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update Miri Notable PRs: - rust-lang/miri#2636 - rust-lang/miri#2641 - rust-lang/miri#2638
RalfJung
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update Miri Notable PRs: - rust-lang#2636 - rust-lang#2641 - rust-lang#2638
spikespaz
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update Miri Notable PRs: - rust-lang/miri#2636 - rust-lang/miri#2641 - rust-lang/miri#2638
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The completion of an InitOnce happens-before the threads waiting on it wake up. However, this is not the case for threads that call
InitOnceBeginInitializeafter the completion, leading to data races and outdated weak memory loads as observed in the CI for #2638. This PR fixes this.