constify a couple thread_local statics #120976
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Feb 12, 2024
| @@ -42,7 42,7 @@ pub struct Registry(Arc<RegistryData>); | |||
| thread_local! { | |||
| /// The registry associated with the thread. | |||
| /// This allows the `WorkerLocal` type to clone the registry in its constructor. | |||
| static REGISTRY: OnceCell<Registry> = OnceCell::new(); | |||
| static REGISTRY: OnceCell<Registry> = const { OnceCell::new() }; | |||
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What is the benefit of doing this?
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according to the docs it can be more efficient to wrap in const
https://rust-lang.github.io/rust-clippy/master/index.html#/thread_local_initializer_can_be_made_const
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A more practical demonstration: https://godbolt.org/z/K1Yxe8193 (You can see that the first variant does lazy initialization and the second does not).
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Gotcha, I missed that this is a thread_local! particular thing.
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r? compiler |
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@bors r rollup |
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…r=lcnr constify a couple thread_local statics
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…llaumeGomez Rollup of 9 pull requests Successful merges: - rust-lang#120976 (constify a couple thread_local statics) - rust-lang#121576 (Convert the rest of the visitors to use `VisitorResult`) - rust-lang#121826 (Use root obligation on E0277 for some cases) - rust-lang#121928 (Extract an arguments struct for `Builder::then_else_break`) - rust-lang#121958 (Fix redundant import errors for preload extern crate) - rust-lang#121959 (Removing absolute path in proc-macro) - rust-lang#121968 (Don't run test_get_os_named_thread on win7) - rust-lang#121977 (Doc: Fix incorrect reference to integer in Atomic{Ptr,Bool}::as_ptr.) - rust-lang#121978 (Fix duplicated path in the "not found dylib" error) r? `@ghost` `@rustbot` modify labels: rollup
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…r=lcnr constify a couple thread_local statics
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…iaskrgr Rollup of 10 pull requests Successful merges: - rust-lang#120976 (constify a couple thread_local statics) - rust-lang#121683 (Fix LVI tests after frame pointers are enabled by default) - rust-lang#121703 (Add a way to add constructors for `rustc_type_ir` types) - rust-lang#121732 (Improve assert_matches! documentation) - rust-lang#121928 (Extract an arguments struct for `Builder::then_else_break`) - rust-lang#121939 (Small enhancement to description of From trait) - rust-lang#121968 (Don't run test_get_os_named_thread on win7) - rust-lang#121969 (`ParseSess` cleanups) - rust-lang#121977 (Doc: Fix incorrect reference to integer in Atomic{Ptr,Bool}::as_ptr.) - rust-lang#121994 (Update platform-support.md with supported musl version) r? `@ghost` `@rustbot` modify labels: rollup
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…iaskrgr Rollup of 10 pull requests Successful merges: - rust-lang#120976 (constify a couple thread_local statics) - rust-lang#121683 (Fix LVI tests after frame pointers are enabled by default) - rust-lang#121703 (Add a way to add constructors for `rustc_type_ir` types) - rust-lang#121732 (Improve assert_matches! documentation) - rust-lang#121928 (Extract an arguments struct for `Builder::then_else_break`) - rust-lang#121939 (Small enhancement to description of From trait) - rust-lang#121968 (Don't run test_get_os_named_thread on win7) - rust-lang#121969 (`ParseSess` cleanups) - rust-lang#121977 (Doc: Fix incorrect reference to integer in Atomic{Ptr,Bool}::as_ptr.) - rust-lang#121994 (Update platform-support.md with supported musl version) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#120976 - matthiaskrgr:constify_TL_statics, r=lcnr constify a couple thread_local statics
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