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Clarified docs on non-atomic oprations on owned/mut refs to atomics #121082

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Feb 15, 2024

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peterjoel
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I originally misinterpreted the documentation to mean that the compiler can/will automatically optimise away atomic operations whenever the data is owned or mutably referenced.

On re-reading I think it is not technically incorrect, but specifically mentioning how the atomic operations can be avoided also prevents this misunderstanding.

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rustbot commented Feb 14, 2024

r? @cuviper

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Feb 14, 2024
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cuviper commented Feb 14, 2024

Thanks!

@bors r+ rollup

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bors commented Feb 14, 2024

📌 Commit 9cccf20 has been approved by cuviper

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 14, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 15, 2024
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Rollup of 10 pull requests

Successful merges:

 - rust-lang#111106 (Add known issue of let binding to format_args doc)
 - rust-lang#118749 (Make contributing to windows bindings easier)
 - rust-lang#120982 (Add APIs for fetching foreign items )
 - rust-lang#121022 (rustdoc: cross-crate re-exports: correctly render late-bound params in source order even if early-bound params are present)
 - rust-lang#121082 (Clarified docs on non-atomic oprations on owned/mut refs to atomics)
 - rust-lang#121084 (Make sure `tcx.create_def` also depends on the forever red node, instead of just `tcx.at(span).create_def`)
 - rust-lang#121098 (Remove unnecessary else block from `thread_local!` expanded code)
 - rust-lang#121105 (Do not report overflow errors on ConstArgHasType goals)
 - rust-lang#121116 (Reinstate some delayed bugs.)
 - rust-lang#121122 (Enforce coroutine-closure layouts are identical)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit e5186aa into rust-lang:master Feb 15, 2024
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@rustbot rustbot added this to the 1.78.0 milestone Feb 15, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Feb 15, 2024
Rollup merge of rust-lang#121082 - peterjoel:atomic-docs, r=cuviper

Clarified docs on non-atomic oprations on owned/mut refs to atomics

I originally misinterpreted the documentation to mean that the compiler can/will automatically optimise away atomic operations whenever the data is owned or mutably referenced.

On re-reading I think it is not technically incorrect, but specifically mentioning _how_ the atomic operations can be avoided also prevents this misunderstanding.
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4 participants