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Broaden the consequences of recursive TLS initialization #116172
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@rfcbot merge This allows thread locals to be implemented as a OnceCell. (Right now, the behavior is a bit weird: you can initialize a thread local twice (or more) by recursively using |
Team member @m-ou-se has proposed to merge this. The next step is review by the rest of the tagged team members: No concerns currently listed. Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up! See this document for info about what commands tagged team members can give me. |
🔔 This is now entering its final comment period, as per the review above. 🔔 |
The final comment period, with a disposition to merge, as per the review above, is now complete. As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed. This will be merged soon. |
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Thank you!
@bors r+ rollup |
…n, r=dtolnay Broaden the consequences of recursive TLS initialization This PR updates the documentation of `LocalKey` to clearly disallow the behaviour described in [this comment](rust-lang#110897 (comment)). This allows using `OnceCell` for the lazy initialization of TLS variables, which panics on reentrant initialization instead of updating the value like TLS variables currently do. `@rustbot` label +T-libs-api r? `@m-ou-se`
…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#115955 (Stabilize `{IpAddr, Ipv6Addr}::to_canonical`) - rust-lang#116033 (report `unused_import` for empty reexports even it is pub) - rust-lang#116172 (Broaden the consequences of recursive TLS initialization) - rust-lang#116341 (Implement sys::args for UEFI) - rust-lang#116522 (use `PatKind::Error` when an ADT const value has violation) - rust-lang#116732 (Make x capable of resolving symlinks) - rust-lang#116755 (Remove me from libcore review rotation) - rust-lang#116760 (Remove trivial cast in `guaranteed_eq`) r? `@ghost` `@rustbot` modify labels: rollup
…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#116172 (Broaden the consequences of recursive TLS initialization) - rust-lang#116341 (Implement sys::args for UEFI) - rust-lang#116522 (use `PatKind::Error` when an ADT const value has violation) - rust-lang#116732 (Make x capable of resolving symlinks) - rust-lang#116755 (Remove me from libcore review rotation) - rust-lang#116760 (Remove trivial cast in `guaranteed_eq`) - rust-lang#116771 (Ignore let-chains formatting) r? `@ghost` `@rustbot` modify labels: rollup
Rollup merge of rust-lang#116172 - joboet:recursive_tls_initialization, r=dtolnay Broaden the consequences of recursive TLS initialization This PR updates the documentation of `LocalKey` to clearly disallow the behaviour described in [this comment](rust-lang#110897 (comment)). This allows using `OnceCell` for the lazy initialization of TLS variables, which panics on reentrant initialization instead of updating the value like TLS variables currently do. ``@rustbot`` label +T-libs-api r? ``@m-ou-se``
54: Pull upstream master 2023 10 17 r=pietroalbini a=Veykril * rust-lang/rust#116196 * rust-lang/rust#116824 * rust-lang/rust#116822 * rust-lang/rust#116477 * rust-lang/rust#116826 * rust-lang/rust#116820 * rust-lang/rust#116811 * rust-lang/rust#116808 * rust-lang/rust#116805 * rust-lang/rust#116800 * rust-lang/rust#116798 * rust-lang/rust#116754 * rust-lang/rust#114370 * rust-lang/rust#116804 * rust-lang/rust#116802 * rust-lang/rust#116790 * rust-lang/rust#116786 * rust-lang/rust#116709 * rust-lang/rust#116430 * rust-lang/rust#116257 * rust-lang/rust#114157 * rust-lang/rust#116731 * rust-lang/rust#116550 * rust-lang/rust#114330 * rust-lang/rust#116724 * rust-lang/rust#116782 * rust-lang/rust#116776 * rust-lang/rust#115955 * rust-lang/rust#115196 * rust-lang/rust#116775 * rust-lang/rust#114589 * rust-lang/rust#113747 * rust-lang/rust#116772 * rust-lang/rust#116771 * rust-lang/rust#116760 * rust-lang/rust#116755 * rust-lang/rust#116732 * rust-lang/rust#116522 * rust-lang/rust#116341 * rust-lang/rust#116172 * rust-lang/rust#110604 * rust-lang/rust#110729 * rust-lang/rust#116527 * rust-lang/rust#116688 * rust-lang/rust#116757 * rust-lang/rust#116753 * rust-lang/rust#116748 * rust-lang/rust#116741 * rust-lang/rust#116594 * rust-lang/rust#116691 * rust-lang/rust#116643 * rust-lang/rust#116683 * rust-lang/rust#116635 * rust-lang/rust#115515 * rust-lang/rust#116742 * rust-lang/rust#116661 * rust-lang/rust#116576 * rust-lang/rust#116540 * rust-lang/rust#116352 * rust-lang/rust#116737 * rust-lang/rust#116730 * rust-lang/rust#116723 * rust-lang/rust#116715 * rust-lang/rust#116603 * rust-lang/rust#116591 * rust-lang/rust#115439 * rust-lang/rust#116264 * rust-lang/rust#116727 * rust-lang/rust#116704 * rust-lang/rust#116696 * rust-lang/rust#116695 * rust-lang/rust#116644 * rust-lang/rust#116630 * rust-lang/rust#116728 * rust-lang/rust#116689 * rust-lang/rust#116679 * rust-lang/rust#116618 * rust-lang/rust#116577 * rust-lang/rust#115653 * rust-lang/rust#116702 * rust-lang/rust#116015 * rust-lang/rust#115822 * rust-lang/rust#116407 * rust-lang/rust#115719 * rust-lang/rust#115524 * rust-lang/rust#116705 * rust-lang/rust#116645 * rust-lang/rust#116233 * rust-lang/rust#115108 * rust-lang/rust#116670 * rust-lang/rust#116676 * rust-lang/rust#116666 Co-authored-by: Benoît du Garreau <bdgdlm@outlook.com> Co-authored-by: Colin Finck <colin@reactos.org> Co-authored-by: Ian Jackson <ijackson@chiark.greenend.org.uk> Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com> Co-authored-by: León Orell Valerian Liehr <me@fmease.dev> Co-authored-by: Trevor Gross <tmgross@umich.edu> Co-authored-by: Evan Merlock <evan@merlock.dev> Co-authored-by: joboet <jonasboettiger@icloud.com> Co-authored-by: Ralf Jung <post@ralfj.de> Co-authored-by: DaniPopes <57450786+DaniPopes@users.noreply.github.com> Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com> Co-authored-by: onur-ozkan <work@onurozkan.dev> Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com> Co-authored-by: The 8472 <git@infinite-source.de> Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Co-authored-by: reez12g <reez12g@gmail.com> Co-authored-by: Jakub Beránek <berykubik@gmail.com>
Pkgsrc changes: * Adjust patches and cargo checksums to new versions. * For an external LLVM, set dependency of llvm >= 16, in accordance with the upstream changes. * Mark that on NetBSD we now need >= 9.0, so 8.x is no longer supported. * On NetBSD/sparc64 10.x, we now need GCC 12 to build the embedded LLVM, which is version 17; apparently GCC 10.4 or 10.5 mis-compiles it, resulting in an illegal instruction fault during the build. Ref. rust-lang/rust#117231 Upstream changes: Version 1.75.0 (2023-12-28) ========================== - [Stabilize `async fn` and return-position `impl Trait` in traits.] (rust-lang/rust#115822) - [Allow function pointer signatures containing `&mut T` in `const` contexts.] (rust-lang/rust#116015) - [Match `usize`/`isize` exhaustively with half-open ranges.] (rust-lang/rust#116692) - [Guarantee that `char` has the same size and alignment as `u32`.] (rust-lang/rust#116894) - [Document that the null pointer has the 0 address.] (rust-lang/rust#116988) - [Allow partially moved values in `match`.] (rust-lang/rust#103208) - [Add notes about non-compliant FP behavior on 32bit x86 targets.] (rust-lang/rust#113053) - [Stabilize ratified RISC-V target features.] (rust-lang/rust#116485) Compiler -------- - [Rework negative coherence to properly consider impls that only partly overlap.] (rust-lang/rust#112875) - [Bump `COINDUCTIVE_OVERLAP_IN_COHERENCE` to deny, and warn in dependencies.] (rust-lang/rust#116493) - [Consider alias bounds when computing liveness in NLL.] (rust-lang/rust#116733) - [Add the V (vector) extension to the `riscv64-linux-android` target spec.] (rust-lang/rust#116618) - [Automatically enable cross-crate inlining for small functions] (rust-lang/rust#116505) - Add several new tier 3 targets: - [`csky-unknown-linux-gnuabiv2hf`] (rust-lang/rust#117049) - [`i586-unknown-netbsd`] (rust-lang/rust#117170) - [`mipsel-unknown-netbsd`] (rust-lang/rust#117356) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Override `Waker::clone_from` to avoid cloning `Waker`s unnecessarily.] (rust-lang/rust#96979) - [Implement `BufRead` for `VecDeque<u8>`.] (rust-lang/rust#110604) - [Implement `FusedIterator` for `DecodeUtf16` when the inner iterator does.] (rust-lang/rust#110729) - [Implement `Not, Bit{And,Or}{,Assign}` for IP addresses.] (rust-lang/rust#113747) - [Implement `Default` for `ExitCode`.] (rust-lang/rust#114589) - [Guarantee representation of None in NPO] (rust-lang/rust#115333) - [Document when atomic loads are guaranteed read-only.] (rust-lang/rust#115577) - [Broaden the consequences of recursive TLS initialization.] (rust-lang/rust#116172) - [Windows: Support sub-millisecond sleep.] (rust-lang/rust#116461) - [Fix generic bound of `str::SplitInclusive`'s `DoubleEndedIterator` impl] (rust-lang/rust#100806) - [Fix exit status / wait status on non-Unix `cfg(unix)` platforms.] (rust-lang/rust#115108) Stabilized APIs --------------- - [`Atomic*::from_ptr`] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicUsize.html#method.from_ptr) - [`FileTimes`] (https://doc.rust-lang.org/stable/std/fs/struct.FileTimes.html) - [`FileTimesExt`] (https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTimesExt.html) - [`File::set_modified`] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_modified) - [`File::set_times`] (https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.set_times) - [`IpAddr::to_canonical`] (https://doc.rust-lang.org/stable/core/net/enum.IpAddr.html#method.to_canonical) - [`Ipv6Addr::to_canonical`] (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_canonical) - [`Option::as_slice`] (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_slice) - [`Option::as_mut_slice`] (https://doc.rust-lang.org/stable/core/option/enum.Option.html#method.as_mut_slice) - [`pointer::byte_add`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_add) - [`pointer::byte_offset`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset) - [`pointer::byte_offset_from`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_offset_from) - [`pointer::byte_sub`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.byte_sub) - [`pointer::wrapping_byte_add`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_add) - [`pointer::wrapping_byte_offset`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_offset) - [`pointer::wrapping_byte_sub`] (https://doc.rust-lang.org/stable/core/primitive.pointer.html#method.wrapping_byte_sub) These APIs are now stable in const contexts: - [`Ipv6Addr::to_ipv4_mapped`] (https://doc.rust-lang.org/stable/core/net/struct.Ipv6Addr.html#method.to_ipv4_mapped) - [`MaybeUninit::assume_init_read`] (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.assume_init_read) - [`MaybeUninit::zeroed`] (https://doc.rust-lang.org/stable/core/mem/union.MaybeUninit.html#method.zeroed) - [`mem::discriminant`] (https://doc.rust-lang.org/stable/core/mem/fn.discriminant.html) - [`mem::zeroed`] (https://doc.rust-lang.org/stable/core/mem/fn.zeroed.html) Cargo ----- - [Add new packages to `[workspace.members]` automatically.] (rust-lang/cargo#12779) - [Allow version-less `Cargo.toml` manifests.] (rust-lang/cargo#12786) - [Make browser links out of HTML file paths.] (rust-lang/cargo#12889) Rustdoc ------- - [Accept less invalid Rust in rustdoc.] (rust-lang/rust#117450) - [Document lack of object safety on affected traits.] (rust-lang/rust#113241) - [Hide `#[repr(transparent)]` if it isn't part of the public ABI.] (rust-lang/rust#115439) - [Show enum discriminant if it is a C-like variant.] (rust-lang/rust#116142) Compatibility Notes ------------------- - [FreeBSD targets now require at least version 12.] (rust-lang/rust#114521) - [Formally demote tier 2 MIPS targets to tier 3.] (rust-lang/rust#115238) - [Make misalignment a hard error in `const` contexts.] (rust-lang/rust#115524) - [Fix detecting references to packed unsized fields.] (rust-lang/rust#115583) - [Remove support for compiler plugins.] (rust-lang/rust#116412)
This PR updates the documentation of
LocalKey
to clearly disallow the behaviour described in this comment. This allows usingOnceCell
for the lazy initialization of TLS variables, which panics on reentrant initialization instead of updating the value like TLS variables currently do.@rustbot label +T-libs-api
r? @m-ou-se