Strenghten synchronization in Arc::is_unique
#52031
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Previously, `is_unique` would not synchronize at all with a `drop` that returned early because it was not the last reference, leading to a data race. Fixes rust-lang#51780
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Strenghten synchronization in `Arc::is_unique` Previously, `is_unique` would not synchronize at all with a `drop` that returned early because it was not the last reference, leading to a data race. Fixes rust-lang#51780 Unfortunately I have no idea how to add a test for this. Cc @jhjourdan
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Rollup of 14 pull requests Successful merges: - #51619 (rust: add initial changes to support powerpc64le musl) - #51793 (Fix variant background color on hover in search results) - #52005 (Update LLVM to bring in a wasm codegen fix) - #52016 (Deduplicate error reports for statics) - #52019 ([cross-lang-lto] Allow the linker to choose the LTO-plugin (which is useful when using LLD)) - #52030 (Any docs preposition change) - #52031 (Strenghten synchronization in `Arc::is_unique`) - #52033 ([Gardening] Update outdated comments: ByVal -> Scalar) - #52052 (Make verbose --version show if parallel queries are supported.) - #52055 (Include VS 2017 in error message.) - #52063 (Add a link to the rustc docs) - #52073 (Add a punch card to weird expressions test) - #52080 (Improve dependency deduplication diagnostics) - #51953 (enable Atomic*.{load,store} for ARMv6-M / MSP430) Failed merges:
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Rollup of 14 pull requests Successful merges: - #51619 (rust: add initial changes to support powerpc64le musl) - #51793 (Fix variant background color on hover in search results) - #52005 (Update LLVM to bring in a wasm codegen fix) - #52016 (Deduplicate error reports for statics) - #52019 ([cross-lang-lto] Allow the linker to choose the LTO-plugin (which is useful when using LLD)) - #52030 (Any docs preposition change) - #52031 (Strenghten synchronization in `Arc::is_unique`) - #52033 ([Gardening] Update outdated comments: ByVal -> Scalar) - #52055 (Include VS 2017 in error message.) - #52063 (Add a link to the rustc docs) - #52073 (Add a punch card to weird expressions test) - #52080 (Improve dependency deduplication diagnostics) - #52093 (rustc: Update tracking issue for wasm_import_module) - #52096 (Fix typo in cell.rs) Failed merges:
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Previously,
is_uniquewould not synchronize at all with adropthat returnedearly because it was not the last reference, leading to a data race.
Fixes #51780
Unfortunately I have no idea how to add a test for this.
Cc @jhjourdan