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Vendor dependencies for 0.3.0 release

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Robert Garrett
2025-09-27 10:29:08 -05:00
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# Changelog
All notable changes to this project will be documented in this file.
This project adheres to [Semantic Versioning](https://semver.org).
Releases may yanked if there is a security bug, a soundness bug, or a regression.
<!--
Note: In this file, do not use the hard wrap in the middle of a sentence for compatibility with GitHub comment style markdown rendering.
-->
## [Unreleased]
## [0.2.4] - 2024-11-23
- Add unstable `portable_atomic_unstable_coerce_unsized` cfg (requires Rust nightly). ([#195](https://github.com/taiki-e/portable-atomic/pull/195), thanks @brodycj)
- Respect [`RUSTC_BOOTSTRAP=-1` recently added in nightly](https://github.com/rust-lang/rust/pull/132993) in rustc version detection. ([5b2847a](https://github.com/taiki-e/portable-atomic/commit/5b2847a8b99aa2a57a6c80f5a47327b2764f08cc))
## [0.2.3] - 2024-10-17
- Add `new_uninit`/`new_uninit_slice`/`assume_init` to `Arc` at Rust 1.36+. (align to the [std `Arc` change in Rust 1.82](https://github.com/rust-lang/rust/pull/129401)) ([362dc9a](https://github.com/taiki-e/portable-atomic/commit/362dc9af2779c81aa346e89c4d3f3eef71cf29ed))
- Support `make_mut` on `Arc<[T]>` and `Arc<str>` at Rust 1.36+. (align to the [std `Arc` change in Rust 1.81](https://github.com/rust-lang/rust/pull/116113)) ([362dc9a](https://github.com/taiki-e/portable-atomic/commit/362dc9af2779c81aa346e89c4d3f3eef71cf29ed))
## [0.2.2] - 2024-07-11
- Fix [build issue with `esp` toolchain](https://github.com/taiki-e/semihosting/issues/11). ([f8ea85e](https://github.com/taiki-e/portable-atomic/commit/f8ea85e1aa46fa00bc865633fb40b05f8a0c823b))
## [0.2.1] - 2024-06-22
**Note:** This release has been yanked due to an issue fixed in 0.2.2.
- Support `impl Error for Arc<T: Error>` in no-std at Rust 1.81+. ([30b9f90](https://github.com/taiki-e/portable-atomic/commit/30b9f90346dfad14ab00f1c7e1f988f941330bcf))
- Implement `Default` for `Arc<[T]>` and `Arc<str>` at Rust 1.51+. (align to the [std `Arc` change in Rust 1.80](https://github.com/rust-lang/rust/pull/124640)) ([c6ee296](https://github.com/taiki-e/portable-atomic/commit/c6ee29606984863d008c2cf2209751ed0fa43b14))
- Implement `{AsFd, AsRawFd}` for `Arc<T>` on HermitOS. ([b778244](https://github.com/taiki-e/portable-atomic/commit/b778244917e17bfc431c9add4d028ff26d00e3b7))
## [0.2.0] - 2024-05-07
- Rewrite `Arc` based on `std::sync::Arc`'s implementation. ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
This fixes accidental API differences with std ([#139](https://github.com/taiki-e/portable-atomic/issues/139), [#140](https://github.com/taiki-e/portable-atomic/issues/140)) and adds many missing APIs compared to std:
- Add `Arc::{downcast, into_inner, make_mut, new_cyclic}` ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
- Implement `{fmt::Display, fmt::Pointer, Error, From<T>, From<Box<T>>, From<Cow<'a,T>>, AsFd, AsRawFd, AsHandle, AsSocket}` for `Arc<T>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142), [78690d7](https://github.com/taiki-e/portable-atomic/commit/78690d7cad3b394119ea147c5773f67806a6ac09), [aba0930](https://github.com/taiki-e/portable-atomic/commit/aba0930269d7075b81810b49bbbbb6c5edc85ea0))
- Implement `{From<&[T]>, From<Vec<T>>, From<[T; N]>, FromIterator<T>}` for `Arc<[T]>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142), [5e9f693](https://github.com/taiki-e/portable-atomic/commit/5e9f693dcb43c35187ca95ce1c824e0cb1d3c4f8))
- Implement `TryFrom<Arc<[T]>>` for `Arc<[T; N]>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
- Implement `From<Arc<str>>` for `Arc<[u8]>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
- Implement `{From<&str>, From<String>}` for `Arc<str>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
- Implement `{Read, Write, Seek}` for `Arc<File>` ([591ece5](https://github.com/taiki-e/portable-atomic/commit/591ece5bde0f19f1895853791924ee55c51ee61e))
- Remove `T: UnwindSafe` bound from `impl UnwindSafe for Arc<T>` ([#142](https://github.com/taiki-e/portable-atomic/pull/142))
- Add `task::Wake`. ([#145](https://github.com/taiki-e/portable-atomic/pull/145))
This is equivalent to `std::task::Wake`, but using `portable_atomic_util::Arc` as a reference-counted pointer.
- Respect `RUSTC_WRAPPER` in rustc version detection.
## [0.1.5] - 2023-12-17
- Improve offset calculation in `Arc::{into_raw,as_ptr,from_ptr}`. ([#141](https://github.com/taiki-e/portable-atomic/pull/141), thanks @gtsiam)
## [0.1.4] - 2023-12-16
- Fix a bug where `Arc::{into_raw,as_ptr}` returned invalid pointers for larger alignment types. ([#138](https://github.com/taiki-e/portable-atomic/pull/138), thanks @notgull)
## [0.1.3] - 2023-05-06
**Note:** This release has been yanked due to a bug fixed in 0.1.4.
- Enable `portable-atomic`'s `require-cas` feature to display helpful error messages to users on targets requiring additional action on the user side to provide atomic CAS. ([#100](https://github.com/taiki-e/portable-atomic/pull/100))
## [0.1.2] - 2023-04-04
**Note:** This release has been yanked due to a bug fixed in 0.1.4.
- Implement `AsRef`, `Borrow`, and `Unpin` on `Arc`. ([#92](https://github.com/taiki-e/portable-atomic/pull/92) [#93](https://github.com/taiki-e/portable-atomic/pull/93), thanks @notgull)
## [0.1.1] - 2023-03-24
**Note:** This release has been yanked due to a bug fixed in 0.1.4.
- Prevent weak counter overflow in `Arc::downgrade`. ([#83](https://github.com/taiki-e/portable-atomic/pull/83))
This fixes [a potential unsoundness recently found in the standard library's `Arc`](https://github.com/rust-lang/rust/issues/108706).
## [0.1.0] - 2023-01-15
**Note:** This release has been yanked due to a bug fixed in 0.1.4.
Initial release
[Unreleased]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.2.4...HEAD
[0.2.4]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.2.3...portable-atomic-util-0.2.4
[0.2.3]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.2.2...portable-atomic-util-0.2.3
[0.2.2]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.2.1...portable-atomic-util-0.2.2
[0.2.1]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.2.0...portable-atomic-util-0.2.1
[0.2.0]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.5...portable-atomic-util-0.2.0
[0.1.5]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.4...portable-atomic-util-0.1.5
[0.1.4]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.3...portable-atomic-util-0.1.4
[0.1.3]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.2...portable-atomic-util-0.1.3
[0.1.2]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.1...portable-atomic-util-0.1.2
[0.1.1]: https://github.com/taiki-e/portable-atomic/compare/portable-atomic-util-0.1.0...portable-atomic-util-0.1.1
[0.1.0]: https://github.com/taiki-e/portable-atomic/releases/tag/portable-atomic-util-0.1.0

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
rust-version = "1.34"
name = "portable-atomic-util"
version = "0.2.4"
build = "build.rs"
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = """
Synchronization primitives built with portable-atomic.
"""
readme = "README.md"
keywords = ["atomic"]
categories = [
"concurrency",
"data-structures",
"embedded",
"no-std",
]
license = "Apache-2.0 OR MIT"
repository = "https://github.com/taiki-e/portable-atomic"
[package.metadata.cargo_check_external_types]
allowed_external_types = []
[package.metadata.docs.rs]
all-features = true
targets = ["x86_64-unknown-linux-gnu"]
[lib]
name = "portable_atomic_util"
path = "src/lib.rs"
doc-scrape-examples = false
[[test]]
name = "arc"
path = "tests/arc.rs"
[dependencies.portable-atomic]
version = "1.5.1"
features = ["require-cas"]
default-features = false
[dev-dependencies.build-context]
version = "0.1"
[features]
alloc = []
default = []
std = ["alloc"]
[lints.clippy]
all = "warn"
as_ptr_cast_mut = "warn"
as_underscore = "warn"
default_union_representation = "warn"
inline_asm_x86_att_syntax = "warn"
pedantic = "warn"
trailing_empty_array = "warn"
transmute_undefined_repr = "warn"
undocumented_unsafe_blocks = "warn"
[lints.clippy.bool_assert_comparison]
level = "allow"
priority = 1
[lints.clippy.borrow_as_ptr]
level = "allow"
priority = 1
[lints.clippy.cast_lossless]
level = "allow"
priority = 1
[lints.clippy.declare_interior_mutable_const]
level = "allow"
priority = 1
[lints.clippy.doc_markdown]
level = "allow"
priority = 1
[lints.clippy.float_cmp]
level = "allow"
priority = 1
[lints.clippy.incompatible_msrv]
level = "allow"
priority = 1
[lints.clippy.lint_groups_priority]
level = "allow"
priority = 1
[lints.clippy.manual_assert]
level = "allow"
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[lints.clippy.struct_excessive_bools]
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deprecated_safe = "warn"
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unreachable_pub = "warn"
[lints.rust.unexpected_cfgs]
level = "warn"
priority = 0
check-cfg = [
'cfg(target_arch,values("xtensa"))',
'cfg(target_os,values("psx"))',
'cfg(target_env,values("psx"))',
'cfg(target_feature,values("lse2","lse128","rcpc3"))',
'cfg(target_feature,values("quadword-atomics"))',
'cfg(target_feature,values("zaamo","zabha"))',
'cfg(target_pointer_width,values("128"))',
"cfg(portable_atomic_test_outline_atomics_detect_false,qemu,valgrind)",
"cfg(portable_atomic_no_outline_atomics,portable_atomic_outline_atomics)",
"cfg(portable_atomic_unstable_coerce_unsized)",
]

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Permission is hereby granted, free of charge, to any
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# portable-atomic-util
[![crates.io](https://img.shields.io/crates/v/portable-atomic-util?style=flat-square&logo=rust)](https://crates.io/crates/portable-atomic-util)
[![docs.rs](https://img.shields.io/badge/docs.rs-portable--atomic--util-blue?style=flat-square&logo=docs.rs)](https://docs.rs/portable-atomic-util)
[![license](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue?style=flat-square)](#license)
[![msrv](https://img.shields.io/badge/msrv-1.34-blue?style=flat-square&logo=rust)](https://www.rust-lang.org)
[![github actions](https://img.shields.io/github/actions/workflow/status/taiki-e/portable-atomic/ci.yml?branch=main&style=flat-square&logo=github)](https://github.com/taiki-e/portable-atomic/actions)
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<!-- tidy:crate-doc:start -->
Synchronization primitives built with [portable-atomic].
- Provide `Arc`. (optional, requires the `std` or `alloc` feature)
- Provide `task::Wake`. (optional, requires the `std` or `alloc` feature)
<!-- - Provide generic `Atomic<T>` type. (optional, requires the `generic` feature) -->
See [#1] for other primitives being considered for addition to this crate.
## Optional features
- **`std`**<br>
Use `std`.
Note:
- This implicitly enables the `alloc` feature.
- **`alloc`**<br>
Use `alloc`.
Note:
- The MSRV when this feature is enabled and the `std` feature is *not* enabled is Rust 1.36 that `alloc` crate stabilized.
<!-- TODO: https://github.com/taiki-e/portable-atomic/issues/1
- **`generic`**<br>
Provides generic `Atomic<T>` type.
-->
[portable-atomic]: https://github.com/taiki-e/portable-atomic
[#1]: https://github.com/taiki-e/portable-atomic/issues/1
## Optional cfg
One of the ways to enable cfg is to set [rustflags in the cargo config](https://doc.rust-lang.org/cargo/reference/config.html#targettriplerustflags):
```toml
# .cargo/config.toml
[target.<target>]
rustflags = ["--cfg", "portable_atomic_unstable_coerce_unsized"]
```
Or set environment variable:
```sh
RUSTFLAGS="--cfg portable_atomic_unstable_coerce_unsized" cargo ...
```
- <a name="optional-cfg-unstable-coerce-unsized"></a>**`--cfg portable_atomic_unstable_coerce_unsized`**<br>
Support coercing of `Arc<T>` to `Arc<U>` as in `std::sync::Arc`.
<!-- TODO: add coercing of `Weak<T>` to `Weak<U>` as well, with testing & documentation updates -->
This cfg requires Rust nightly because this coercing requires [unstable `CoerceUnsized` trait](https://doc.rust-lang.org/nightly/core/ops/trait.CoerceUnsized.html).
See [this issue comment](https://github.com/taiki-e/portable-atomic/issues/143#issuecomment-1866488569) for another known workaround.
**Note:** This cfg is unstable and outside of the normal semver guarantees and minor or patch versions of portable-atomic-util may make breaking changes to them at any time.
<!-- tidy:crate-doc:end -->
## License
Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
[MIT license](LICENSE-MIT) at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.

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// SPDX-License-Identifier: Apache-2.0 OR MIT
// The rustc-cfg emitted by the build script are *not* public API.
// version.rs is shared with portable-atomic's build script, and portable-atomic-util only uses a part of it.
#[allow(dead_code)]
#[path = "version.rs"]
mod version;
use self::version::{rustc_version, Version};
use std::env;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=version.rs");
let version = match rustc_version() {
Some(version) => version,
None => {
if env::var_os("PORTABLE_ATOMIC_DENY_WARNINGS").is_some() {
panic!("unable to determine rustc version")
}
println!(
"cargo:warning={}: unable to determine rustc version; assuming latest stable rustc (1.{})",
env!("CARGO_PKG_NAME"),
Version::LATEST.minor
);
Version::LATEST
}
};
if version.minor >= 80 {
// Custom cfgs set by build script. Not public API.
// grep -F 'cargo:rustc-cfg=' build.rs | grep -Ev '^ *//' | sed -E 's/^.*cargo:rustc-cfg=//; s/(=\\)?".*$//' | LC_ALL=C sort -u | tr '\n' ',' | sed -E 's/,$/\n/'
println!(
"cargo:rustc-check-cfg=cfg(portable_atomic_no_alloc,portable_atomic_no_alloc_layout_extras,portable_atomic_no_core_unwind_safe,portable_atomic_no_error_in_core,portable_atomic_no_futures_api,portable_atomic_no_io_safety,portable_atomic_no_io_vec,portable_atomic_no_maybe_uninit,portable_atomic_no_min_const_generics,portable_atomic_no_track_caller,portable_atomic_no_unsafe_op_in_unsafe_fn,portable_atomic_sanitize_thread)"
);
}
// Note that cfgs are `no_`*, not `has_*`. This allows treating as the latest
// stable rustc is used when the build script doesn't run. This is useful
// for non-cargo build systems that don't run the build script.
// alloc stabilized in Rust 1.36 (nightly-2019-04-15) https://github.com/rust-lang/rust/pull/59675
if !version.probe(36, 2019, 4, 14) {
println!("cargo:rustc-cfg=portable_atomic_no_alloc");
}
// std::{future,task} stabilized in Rust 1.36 (nightly-2019-04-25) https://github.com/rust-lang/rust/pull/59739
if !version.probe(36, 2019, 4, 24) {
println!("cargo:rustc-cfg=portable_atomic_no_futures_api");
}
// {read,write}_vectored stabilized in Rust 1.36 (nightly-2019-04-30) https://github.com/rust-lang/rust/pull/60334
if !version.probe(36, 2019, 4, 29) {
println!("cargo:rustc-cfg=portable_atomic_no_io_vec");
}
// MaybeUninit stabilized in Rust 1.36 (nightly-2019-05-21) https://github.com/rust-lang/rust/pull/60445
if !version.probe(36, 2019, 5, 20) {
println!("cargo:rustc-cfg=portable_atomic_no_maybe_uninit");
}
// Layout::{align_to,pad_to_align,extend,array} stabilized in Rust 1.44 (nightly-2020-04-22) https://github.com/rust-lang/rust/pull/69362
if !version.probe(44, 2020, 4, 21) {
println!("cargo:rustc-cfg=portable_atomic_no_alloc_layout_extras");
}
// track_caller stabilized in Rust 1.46 (nightly-2020-07-02): https://github.com/rust-lang/rust/pull/72445
if !version.probe(46, 2020, 7, 1) {
println!("cargo:rustc-cfg=portable_atomic_no_track_caller");
}
// min_const_generics stabilized in Rust 1.51 (nightly-2020-12-28): https://github.com/rust-lang/rust/pull/79135
if !version.probe(51, 2020, 12, 27) {
println!("cargo:rustc-cfg=portable_atomic_no_min_const_generics");
}
// unsafe_op_in_unsafe_fn stabilized in Rust 1.52 (nightly-2021-03-11): https://github.com/rust-lang/rust/pull/79208
if !version.probe(52, 2021, 3, 10) {
println!("cargo:rustc-cfg=portable_atomic_no_unsafe_op_in_unsafe_fn");
}
// https://github.com/rust-lang/rust/pull/84662 merged in Rust 1.56 (nightly-2021-08-02).
if !version.probe(56, 2021, 8, 1) {
println!("cargo:rustc-cfg=portable_atomic_no_core_unwind_safe");
}
// io_safety stabilized in Rust 1.63 (nightly-2022-06-16): https://github.com/rust-lang/rust/pull/95118
if !version.probe(63, 2022, 6, 15) {
println!("cargo:rustc-cfg=portable_atomic_no_io_safety");
}
// error_in_core stabilized in Rust 1.81 (nightly-2024-06-09): https://github.com/rust-lang/rust/pull/125951
if !version.probe(81, 2024, 6, 8) {
println!("cargo:rustc-cfg=portable_atomic_no_error_in_core");
}
if version.nightly {
// `cfg(sanitize = "..")` is not stabilized.
let sanitize = env::var("CARGO_CFG_SANITIZE").unwrap_or_default();
if sanitize.contains("thread") {
println!("cargo:rustc-cfg=portable_atomic_sanitize_thread");
}
}
}

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// SPDX-License-Identifier: Apache-2.0 OR MIT
/*!
<!-- tidy:crate-doc:start -->
Synchronization primitives built with [portable-atomic].
- Provide `Arc`. (optional, requires the `std` or `alloc` feature)
- Provide `task::Wake`. (optional, requires the `std` or `alloc` feature)
<!-- - Provide generic `Atomic<T>` type. (optional, requires the `generic` feature) -->
See [#1] for other primitives being considered for addition to this crate.
## Optional features
- **`std`**<br>
Use `std`.
Note:
- This implicitly enables the `alloc` feature.
- **`alloc`**<br>
Use `alloc`.
Note:
- The MSRV when this feature is enabled and the `std` feature is *not* enabled is Rust 1.36 that `alloc` crate stabilized.
<!-- TODO: https://github.com/taiki-e/portable-atomic/issues/1
- **`generic`**<br>
Provides generic `Atomic<T>` type.
-->
[portable-atomic]: https://github.com/taiki-e/portable-atomic
[#1]: https://github.com/taiki-e/portable-atomic/issues/1
## Optional cfg
One of the ways to enable cfg is to set [rustflags in the cargo config](https://doc.rust-lang.org/cargo/reference/config.html#targettriplerustflags):
```toml
# .cargo/config.toml
[target.<target>]
rustflags = ["--cfg", "portable_atomic_unstable_coerce_unsized"]
```
Or set environment variable:
```sh
RUSTFLAGS="--cfg portable_atomic_unstable_coerce_unsized" cargo ...
```
- <a name="optional-cfg-unstable-coerce-unsized"></a>**`--cfg portable_atomic_unstable_coerce_unsized`**<br>
Support coercing of `Arc<T>` to `Arc<U>` as in `std::sync::Arc`.
<!-- TODO: add coercing of `Weak<T>` to `Weak<U>` as well, with testing & documentation updates -->
This cfg requires Rust nightly because this coercing requires [unstable `CoerceUnsized` trait](https://doc.rust-lang.org/nightly/core/ops/trait.CoerceUnsized.html).
See [this issue comment](https://github.com/taiki-e/portable-atomic/issues/143#issuecomment-1866488569) for another known workaround.
**Note:** This cfg is unstable and outside of the normal semver guarantees and minor or patch versions of portable-atomic-util may make breaking changes to them at any time.
<!-- tidy:crate-doc:end -->
*/
#![no_std]
#![doc(test(
no_crate_inject,
attr(
deny(warnings, rust_2018_idioms, single_use_lifetimes),
allow(dead_code, unused_variables)
)
))]
#![cfg_attr(not(portable_atomic_no_unsafe_op_in_unsafe_fn), warn(unsafe_op_in_unsafe_fn))] // unsafe_op_in_unsafe_fn requires Rust 1.52
#![cfg_attr(portable_atomic_no_unsafe_op_in_unsafe_fn, allow(unused_unsafe))]
#![warn(
// Lints that may help when writing public library.
missing_debug_implementations,
missing_docs,
clippy::alloc_instead_of_core,
clippy::exhaustive_enums,
clippy::exhaustive_structs,
clippy::impl_trait_in_params,
// clippy::missing_inline_in_public_items,
clippy::std_instead_of_alloc,
clippy::std_instead_of_core,
)]
#![allow(clippy::inline_always)]
// docs.rs only (cfg is enabled by docs.rs, not build script)
#![cfg_attr(docsrs, feature(doc_cfg))]
// Enable custom unsized coercions if the user explicitly opts-in to unstable cfg
#![cfg_attr(portable_atomic_unstable_coerce_unsized, feature(coerce_unsized, unsize))]
#[cfg(all(feature = "alloc", not(portable_atomic_no_alloc)))]
extern crate alloc;
#[cfg(feature = "std")]
extern crate std;
#[cfg(all(feature = "std", portable_atomic_no_alloc))]
extern crate std as alloc;
#[cfg(any(all(feature = "alloc", not(portable_atomic_no_alloc)), feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
mod arc;
#[cfg(any(all(feature = "alloc", not(portable_atomic_no_alloc)), feature = "std"))]
pub use self::arc::{Arc, Weak};
#[cfg(not(portable_atomic_no_futures_api))]
#[cfg(any(all(feature = "alloc", not(portable_atomic_no_alloc)), feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
pub mod task;

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// SPDX-License-Identifier: Apache-2.0 OR MIT
//! Types and Traits for working with asynchronous tasks.
// This module is based on alloc::task::Wake.
//
// The code has been adjusted to work with stable Rust.
//
// Source: https://github.com/rust-lang/rust/blob/1.80.0/library/alloc/src/task.rs.
//
// Copyright & License of the original code:
// - https://github.com/rust-lang/rust/blob/1.80.0/COPYRIGHT
// - https://github.com/rust-lang/rust/blob/1.80.0/LICENSE-APACHE
// - https://github.com/rust-lang/rust/blob/1.80.0/LICENSE-MIT
use core::{
mem::ManuallyDrop,
task::{RawWaker, RawWakerVTable, Waker},
};
use crate::Arc;
/// The implementation of waking a task on an executor.
///
/// This is an equivalent to [`std::task::Wake`], but using [`portable_atomic_util::Arc`](crate::Arc)
/// as a reference-counted pointer. See the documentation for [`std::task::Wake`] for more details.
///
/// **Note:** Unlike `std::task::Wake`, all methods take `this:` instead of `self:`.
/// This is because using `portable_atomic_util::Arc` as a receiver requires the
/// [unstable `arbitrary_self_types` feature](https://github.com/rust-lang/rust/issues/44874).
///
/// # Examples
///
/// A basic `block_on` function that takes a future and runs it to completion on
/// the current thread.
///
/// **Note:** This example trades correctness for simplicity. In order to prevent
/// deadlocks, production-grade implementations will also need to handle
/// intermediate calls to `thread::unpark` as well as nested invocations.
///
/// ```
/// use portable_atomic_util::{task::Wake, Arc};
/// use std::{
/// future::Future,
/// task::{Context, Poll},
/// thread::{self, Thread},
/// };
///
/// /// A waker that wakes up the current thread when called.
/// struct ThreadWaker(Thread);
///
/// impl Wake for ThreadWaker {
/// fn wake(this: Arc<Self>) {
/// this.0.unpark();
/// }
/// }
///
/// /// Run a future to completion on the current thread.
/// fn block_on<T>(fut: impl Future<Output = T>) -> T {
/// // Pin the future so it can be polled.
/// let mut fut = Box::pin(fut);
///
/// // Create a new context to be passed to the future.
/// let t = thread::current();
/// let waker = Arc::new(ThreadWaker(t)).into();
/// let mut cx = Context::from_waker(&waker);
///
/// // Run the future to completion.
/// loop {
/// match fut.as_mut().poll(&mut cx) {
/// Poll::Ready(res) => return res,
/// Poll::Pending => thread::park(),
/// }
/// }
/// }
///
/// block_on(async {
/// println!("Hi from inside a future!");
/// });
/// ```
pub trait Wake {
/// Wake this task.
fn wake(this: Arc<Self>);
/// Wake this task without consuming the waker.
///
/// If an executor supports a cheaper way to wake without consuming the
/// waker, it should override this method. By default, it clones the
/// [`Arc`] and calls [`wake`] on the clone.
///
/// [`wake`]: Wake::wake
fn wake_by_ref(this: &Arc<Self>) {
Self::wake(this.clone());
}
}
impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for Waker {
/// Use a `Wake`-able type as a `Waker`.
///
/// No heap allocations or atomic operations are used for this conversion.
fn from(waker: Arc<W>) -> Self {
// SAFETY: This is safe because raw_waker safely constructs
// a RawWaker from Arc<W>.
unsafe { Self::from_raw(raw_waker(waker)) }
}
}
impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for RawWaker {
/// Use a `Wake`-able type as a `RawWaker`.
///
/// No heap allocations or atomic operations are used for this conversion.
fn from(waker: Arc<W>) -> Self {
raw_waker(waker)
}
}
// NB: This private function for constructing a RawWaker is used, rather than
// inlining this into the `From<Arc<W>> for RawWaker` impl, to ensure that
// the safety of `From<Arc<W>> for Waker` does not depend on the correct
// trait dispatch - instead both impls call this function directly and
// explicitly.
#[inline(always)]
fn raw_waker<W: Wake + Send + Sync + 'static>(waker: Arc<W>) -> RawWaker {
// Increment the reference count of the arc to clone it.
//
// The #[inline(always)] is to ensure that raw_waker and clone_waker are
// always generated in the same code generation unit as one another, and
// therefore that the structurally identical const-promoted RawWakerVTable
// within both functions is deduplicated at LLVM IR code generation time.
// This allows optimizing Waker::will_wake to a single pointer comparison of
// the vtable pointers, rather than comparing all four function pointers
// within the vtables.
#[inline(always)]
unsafe fn clone_waker<W: Wake + Send + Sync + 'static>(waker: *const ()) -> RawWaker {
// SAFETY: the caller must uphold the safety contract.
unsafe { Arc::increment_strong_count(waker as *const W) };
RawWaker::new(
waker,
&RawWakerVTable::new(clone_waker::<W>, wake::<W>, wake_by_ref::<W>, drop_waker::<W>),
)
}
// Wake by value, moving the Arc into the Wake::wake function
unsafe fn wake<W: Wake + Send + Sync + 'static>(waker: *const ()) {
// SAFETY: the caller must uphold the safety contract.
let waker = unsafe { Arc::from_raw(waker as *const W) };
<W as Wake>::wake(waker);
}
// Wake by reference, wrap the waker in ManuallyDrop to avoid dropping it
unsafe fn wake_by_ref<W: Wake + Send + Sync + 'static>(waker: *const ()) {
// SAFETY: the caller must uphold the safety contract.
let waker = unsafe { ManuallyDrop::new(Arc::from_raw(waker as *const W)) };
<W as Wake>::wake_by_ref(&waker);
}
// Decrement the reference count of the Arc on drop
unsafe fn drop_waker<W: Wake + Send + Sync + 'static>(waker: *const ()) {
// SAFETY: the caller must uphold the safety contract.
unsafe { Arc::decrement_strong_count(waker as *const W) };
}
RawWaker::new(
Arc::into_raw(waker) as *const (),
&RawWakerVTable::new(clone_waker::<W>, wake::<W>, wake_by_ref::<W>, drop_waker::<W>),
)
}

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// SPDX-License-Identifier: Apache-2.0 OR MIT
#![cfg(any(feature = "std", feature = "alloc"))]
#![allow(clippy::undocumented_unsafe_blocks)]
use std::{borrow::Cow, panic};
use portable_atomic_util::{Arc, Weak};
#[derive(Debug, PartialEq)]
#[repr(align(128))]
struct Aligned(u32);
// https://github.com/taiki-e/portable-atomic/issues/37
#[test]
fn over_aligned() {
let value = Arc::new(Aligned(128));
let ptr = Arc::into_raw(value);
// SAFETY: `ptr` should always be a valid `Aligned`.
assert_eq!(unsafe { (*ptr).0 }, 128);
// SAFETY: `ptr` is a valid reference to an `Arc<Aligned>`.
let value = unsafe { Arc::from_raw(ptr) };
assert_eq!(value.0, 128);
}
#[test]
fn default() {
let v = Arc::<[Aligned]>::default();
assert_eq!(v[..], []);
let v = Arc::<[()]>::default();
assert_eq!(v[..], []);
let v = Arc::<str>::default();
assert_eq!(&v[..], "");
}
#[test]
fn cow_from() {
let o = Cow::Owned("abc".to_owned());
let b = Cow::Borrowed("def");
let o: Arc<str> = Arc::from(o);
let b: Arc<str> = Arc::from(b);
assert_eq!(&*o, "abc");
assert_eq!(&*b, "def");
}
#[test]
fn make_mut_unsized() {
let mut v: Arc<[i32]> = Arc::from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
Arc::make_mut(&mut v)[0] += 10;
assert_eq!(&*v, [11, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
let v1 = Arc::clone(&v);
let v2 = Arc::make_mut(&mut v);
v2[1] += 10;
assert_eq!(&*v1, [11, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
assert_eq!(&*v2, [11, 12, 3, 4, 5, 6, 7, 8, 9, 10]);
assert_eq!(&*v, [11, 12, 3, 4, 5, 6, 7, 8, 9, 10]);
drop(v1);
let w = Arc::downgrade(&v);
Arc::make_mut(&mut v)[2] += 10;
assert_eq!(&*v, [11, 12, 13, 4, 5, 6, 7, 8, 9, 10]);
assert!(w.upgrade().is_none());
}
#[test]
fn make_mut_clone_panic() {
struct C(#[allow(dead_code)] Box<u8>);
impl Clone for C {
fn clone(&self) -> Self {
panic!()
}
}
let mut v: Arc<[C]> = Arc::from([C(Box::new(1)), C(Box::new(2))]);
let _v = Arc::make_mut(&mut v);
let v1 = Arc::clone(&v);
if !is_panic_abort() {
panic::catch_unwind(panic::AssertUnwindSafe(|| {
let _v = Arc::make_mut(&mut v);
}))
.unwrap_err();
}
drop(v1);
}
#[test]
fn weak_dangling() {
let w = Weak::<Aligned>::new();
let p = Weak::into_raw(w);
let w = unsafe { Weak::from_raw(p) };
let w2 = Weak::clone(&w);
assert!(w.upgrade().is_none());
assert!(w2.upgrade().is_none());
}
// For -C panic=abort -Z panic_abort_tests: https://github.com/rust-lang/rust/issues/67650
fn is_panic_abort() -> bool {
build_context::PANIC.contains("abort")
}
// https://github.com/rust-lang/rust/blob/1.80.0/library/alloc/src/sync/tests.rs
#[allow(clippy::many_single_char_names)]
mod alloc_tests {
use std::{
convert::TryInto,
sync::{mpsc::channel, Mutex},
thread,
};
use portable_atomic::{
AtomicBool, AtomicUsize,
Ordering::{Acquire, SeqCst},
};
use portable_atomic_util::{Arc, Weak};
struct Canary(*mut AtomicUsize);
impl Drop for Canary {
fn drop(&mut self) {
unsafe {
match *self {
Canary(c) => {
(*c).fetch_add(1, SeqCst);
}
}
}
}
}
#[test]
#[cfg_attr(target_os = "emscripten", ignore)]
fn manually_share_arc() {
let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let arc_v = Arc::new(v);
let (tx, rx) = channel();
let _t = thread::spawn(move || {
let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
assert_eq!((*arc_v)[3], 4);
});
tx.send(arc_v.clone()).unwrap();
assert_eq!((*arc_v)[2], 3);
assert_eq!((*arc_v)[4], 5);
}
#[test]
fn test_arc_get_mut() {
let mut x = Arc::new(3);
*Arc::get_mut(&mut x).unwrap() = 4;
assert_eq!(*x, 4);
let y = x.clone();
assert!(Arc::get_mut(&mut x).is_none());
drop(y);
assert!(Arc::get_mut(&mut x).is_some());
let _w = Arc::downgrade(&x);
assert!(Arc::get_mut(&mut x).is_none());
}
#[test]
fn weak_counts() {
assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
let a = Arc::new(0);
let w = Arc::downgrade(&a);
assert_eq!(Weak::strong_count(&w), 1);
assert_eq!(Weak::weak_count(&w), 1);
let w2 = w.clone();
assert_eq!(Weak::strong_count(&w), 1);
assert_eq!(Weak::weak_count(&w), 2);
assert_eq!(Weak::strong_count(&w2), 1);
assert_eq!(Weak::weak_count(&w2), 2);
drop(w);
assert_eq!(Weak::strong_count(&w2), 1);
assert_eq!(Weak::weak_count(&w2), 1);
let a2 = a.clone();
assert_eq!(Weak::strong_count(&w2), 2);
assert_eq!(Weak::weak_count(&w2), 1);
drop(a2);
drop(a);
assert_eq!(Weak::strong_count(&w2), 0);
assert_eq!(Weak::weak_count(&w2), 0);
drop(w2);
}
#[test]
fn try_unwrap() {
let x = Arc::new(3);
assert_eq!(Arc::try_unwrap(x), Ok(3));
let x = Arc::new(4);
let _y = x.clone();
assert_eq!(Arc::try_unwrap(x), Err(Arc::new(4)));
let x = Arc::new(5);
let _w = Arc::downgrade(&x);
assert_eq!(Arc::try_unwrap(x), Ok(5));
}
#[test]
fn into_inner() {
for _ in 0..100
// ^ Increase chances of hitting potential race conditions
{
let x = Arc::new(3);
let y = Arc::clone(&x);
let r_thread = std::thread::spawn(|| Arc::into_inner(x));
let s_thread = std::thread::spawn(|| Arc::into_inner(y));
let r = r_thread.join().expect("r_thread panicked");
let s = s_thread.join().expect("s_thread panicked");
assert!(
matches!((r, s), (None, Some(3)) | (Some(3), None)),
"assertion failed: unexpected result `{:?}`\
\n expected `(None, Some(3))` or `(Some(3), None)`",
(r, s),
);
}
let x = Arc::new(3);
assert_eq!(Arc::into_inner(x), Some(3));
let x = Arc::new(4);
let y = Arc::clone(&x);
assert_eq!(Arc::into_inner(x), None);
assert_eq!(Arc::into_inner(y), Some(4));
let x = Arc::new(5);
let _w = Arc::downgrade(&x);
assert_eq!(Arc::into_inner(x), Some(5));
}
#[test]
fn into_from_raw() {
let x = Arc::new(Box::new("hello"));
let y = x.clone();
let x_ptr = Arc::into_raw(x);
drop(y);
unsafe {
assert_eq!(**x_ptr, "hello");
let x = Arc::from_raw(x_ptr);
assert_eq!(**x, "hello");
assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
}
}
#[test]
fn test_into_from_raw_unsized() {
use std::fmt::Display;
let arc: Arc<str> = Arc::from("foo");
let ptr = Arc::into_raw(arc.clone());
let arc2 = unsafe { Arc::from_raw(ptr) };
assert_eq!(unsafe { &*ptr }, "foo");
assert_eq!(arc, arc2);
#[cfg(portable_atomic_unstable_coerce_unsized)]
let arc: Arc<dyn Display> = Arc::new(123);
// TODO: This is a workaround in case CoerceUnsized is not available - remove this once it is no longer needed
#[cfg(not(portable_atomic_unstable_coerce_unsized))]
let arc: Arc<dyn Display> = Arc::from(Box::new(123) as Box<dyn Display>);
let ptr = Arc::into_raw(arc.clone());
let arc2 = unsafe { Arc::from_raw(ptr) };
assert_eq!(unsafe { &*ptr }.to_string(), "123");
assert_eq!(arc2.to_string(), "123");
}
#[test]
fn into_from_weak_raw() {
let x = Arc::new(Box::new("hello"));
let y = Arc::downgrade(&x);
let y_ptr = Weak::into_raw(y);
unsafe {
assert_eq!(**y_ptr, "hello");
let y = Weak::from_raw(y_ptr);
let y_up = Weak::upgrade(&y).unwrap();
assert_eq!(**y_up, "hello");
drop(y_up);
assert_eq!(Arc::try_unwrap(x).map(|x| *x), Ok("hello"));
}
}
// TODO: See Weak::from_raw
// #[test]
// fn test_into_from_weak_raw_unsized() {
// use std::fmt::Display;
// let arc: Arc<str> = Arc::from("foo");
// let weak: Weak<str> = Arc::downgrade(&arc);
// let ptr = Weak::into_raw(weak.clone());
// let weak2 = unsafe { Weak::from_raw(ptr) };
// assert_eq!(unsafe { &*ptr }, "foo");
// assert!(weak.ptr_eq(&weak2));
// // TODO: CoerceUnsized is needed to cast to Arc<dyn ..>
// // (may be possible to support this with portable_atomic_unstable_coerce_unsized cfg option)
// // let arc: Arc<dyn Display> = Arc::new(123);
// let arc: Arc<dyn Display> = Arc::from(Box::new(123) as Box<dyn Display>);
// let weak: Weak<dyn Display> = Arc::downgrade(&arc);
// let ptr = Weak::into_raw(weak.clone());
// let weak2 = unsafe { Weak::from_raw(ptr) };
// assert_eq!(unsafe { &*ptr }.to_string(), "123");
// assert!(weak.ptr_eq(&weak2));
// }
#[test]
fn test_cow_arc_clone_make_mut() {
let mut cow0 = Arc::new(75);
let mut cow1 = cow0.clone();
let mut cow2 = cow1.clone();
assert!(75 == *Arc::make_mut(&mut cow0));
assert!(75 == *Arc::make_mut(&mut cow1));
assert!(75 == *Arc::make_mut(&mut cow2));
*Arc::make_mut(&mut cow0) += 1;
*Arc::make_mut(&mut cow1) += 2;
*Arc::make_mut(&mut cow2) += 3;
assert!(76 == *cow0);
assert!(77 == *cow1);
assert!(78 == *cow2);
// none should point to the same backing memory
assert!(*cow0 != *cow1);
assert!(*cow0 != *cow2);
assert!(*cow1 != *cow2);
}
#[test]
fn test_cow_arc_clone_unique2() {
let mut cow0 = Arc::new(75);
let cow1 = cow0.clone();
let cow2 = cow1.clone();
assert!(75 == *cow0);
assert!(75 == *cow1);
assert!(75 == *cow2);
*Arc::make_mut(&mut cow0) += 1;
assert!(76 == *cow0);
assert!(75 == *cow1);
assert!(75 == *cow2);
// cow1 and cow2 should share the same contents
// cow0 should have a unique reference
assert!(*cow0 != *cow1);
assert!(*cow0 != *cow2);
assert!(*cow1 == *cow2);
}
#[test]
fn test_cow_arc_clone_weak() {
let mut cow0 = Arc::new(75);
let cow1_weak = Arc::downgrade(&cow0);
assert!(75 == *cow0);
assert!(75 == *cow1_weak.upgrade().unwrap());
*Arc::make_mut(&mut cow0) += 1;
assert!(76 == *cow0);
assert!(cow1_weak.upgrade().is_none());
}
#[test]
fn test_live() {
let x = Arc::new(5);
let y = Arc::downgrade(&x);
assert!(y.upgrade().is_some());
}
#[test]
fn test_dead() {
let x = Arc::new(5);
let y = Arc::downgrade(&x);
drop(x);
assert!(y.upgrade().is_none());
}
#[test]
fn weak_self_cyclic() {
struct Cycle {
x: Mutex<Option<Weak<Cycle>>>,
}
let a = Arc::new(Cycle { x: Mutex::new(None) });
let b = Arc::downgrade(&a.clone());
*a.x.lock().unwrap() = Some(b);
// hopefully we don't double-free (or leak)...
}
#[test]
fn drop_arc() {
let mut canary = AtomicUsize::new(0);
let x = Arc::new(Canary(&mut canary as *mut AtomicUsize));
drop(x);
assert!(canary.load(Acquire) == 1);
}
#[test]
fn drop_arc_weak() {
let mut canary = AtomicUsize::new(0);
let arc = Arc::new(Canary(&mut canary as *mut AtomicUsize));
let arc_weak = Arc::downgrade(&arc);
assert!(canary.load(Acquire) == 0);
drop(arc);
assert!(canary.load(Acquire) == 1);
drop(arc_weak);
}
#[test]
fn test_strong_count() {
let a = Arc::new(0);
assert!(Arc::strong_count(&a) == 1);
let w = Arc::downgrade(&a);
assert!(Arc::strong_count(&a) == 1);
let b = w.upgrade().expect("");
assert!(Arc::strong_count(&b) == 2);
assert!(Arc::strong_count(&a) == 2);
drop(w);
drop(a);
assert!(Arc::strong_count(&b) == 1);
let c = b.clone();
assert!(Arc::strong_count(&b) == 2);
assert!(Arc::strong_count(&c) == 2);
}
#[test]
fn test_weak_count() {
let a = Arc::new(0);
assert!(Arc::strong_count(&a) == 1);
assert!(Arc::weak_count(&a) == 0);
let w = Arc::downgrade(&a);
assert!(Arc::strong_count(&a) == 1);
assert!(Arc::weak_count(&a) == 1);
let x = w.clone();
assert!(Arc::weak_count(&a) == 2);
drop(w);
drop(x);
assert!(Arc::strong_count(&a) == 1);
assert!(Arc::weak_count(&a) == 0);
let c = a.clone();
assert!(Arc::strong_count(&a) == 2);
assert!(Arc::weak_count(&a) == 0);
let d = Arc::downgrade(&c);
assert!(Arc::weak_count(&c) == 1);
assert!(Arc::strong_count(&c) == 2);
drop(a);
drop(c);
drop(d);
}
#[test]
fn show_arc() {
let a = Arc::new(5);
assert_eq!(format!("{:?}", a), "5");
}
// Make sure deriving works with Arc<T>
#[allow(dead_code)]
#[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
struct Foo {
inner: Arc<i32>,
}
#[test]
fn test_unsized() {
#[cfg(portable_atomic_unstable_coerce_unsized)]
let x: Arc<[i32]> = Arc::new([1, 2, 3]);
// TODO: This is a workaround in case CoerceUnsized is not available - remove this once it is no longer needed
#[cfg(not(portable_atomic_unstable_coerce_unsized))]
let x: Arc<[i32]> = Arc::from(Box::new([1, 2, 3]) as Box<[i32]>);
assert_eq!(format!("{:?}", x), "[1, 2, 3]");
let y = Arc::downgrade(&x.clone());
drop(x);
assert!(y.upgrade().is_none());
}
#[test]
fn test_maybe_thin_unsized() {
// If/when custom thin DSTs exist, this test should be updated to use one
use std::ffi::{CStr, CString};
let x: Arc<CStr> = Arc::from(CString::new("swordfish").unwrap().into_boxed_c_str());
assert_eq!(format!("{:?}", x), "\"swordfish\"");
let y: Weak<CStr> = Arc::downgrade(&x);
drop(x);
// At this point, the weak points to a dropped DST
assert!(y.upgrade().is_none());
// But we still need to be able to get the alloc layout to drop.
// CStr has no drop glue, but custom DSTs might, and need to work.
drop(y);
}
#[test]
fn test_from_owned() {
let foo = 123;
let foo_arc = Arc::from(foo);
assert!(123 == *foo_arc);
}
#[test]
fn test_new_weak() {
let foo: Weak<usize> = Weak::new();
assert!(foo.upgrade().is_none());
}
#[test]
fn test_ptr_eq() {
let five = Arc::new(5);
let same_five = five.clone();
let other_five = Arc::new(5);
assert!(Arc::ptr_eq(&five, &same_five));
assert!(!Arc::ptr_eq(&five, &other_five));
}
#[test]
#[cfg_attr(target_os = "emscripten", ignore)]
fn test_weak_count_locked() {
let mut a = Arc::new(AtomicBool::new(false));
let a2 = a.clone();
let t = thread::spawn(move || {
// Miri is too slow
let count = if cfg!(miri) { 1_000 } else { 1_000_000 };
for _i in 0..count {
Arc::get_mut(&mut a);
}
a.store(true, SeqCst);
});
while !a2.load(SeqCst) {
let n = Arc::weak_count(&a2);
assert!(n < 2, "bad weak count: {}", n);
#[cfg(miri)] // Miri's scheduler does not guarantee liveness, and thus needs this hint.
std::hint::spin_loop();
}
t.join().unwrap();
}
#[test]
fn test_from_str() {
let r: Arc<str> = Arc::from("foo");
assert_eq!(&r[..], "foo");
}
#[test]
fn test_copy_from_slice() {
let s: &[u32] = &[1, 2, 3];
let r: Arc<[u32]> = Arc::from(s);
assert_eq!(&r[..], [1, 2, 3]);
}
#[test]
fn test_clone_from_slice() {
#[derive(Clone, Debug, Eq, PartialEq)]
struct X(u32);
let s: &[X] = &[X(1), X(2), X(3)];
let r: Arc<[X]> = Arc::from(s);
assert_eq!(&r[..], s);
}
#[test]
#[should_panic = "test_clone_from_slice_panic"]
fn test_clone_from_slice_panic() {
struct Fail(u32, String);
impl Clone for Fail {
fn clone(&self) -> Fail {
if self.0 == 2 {
panic!("test_clone_from_slice_panic");
}
Fail(self.0, self.1.clone())
}
}
let s: &[Fail] =
&[Fail(0, "foo".to_owned()), Fail(1, "bar".to_owned()), Fail(2, "baz".to_owned())];
// Should panic, but not cause memory corruption
let _r: Arc<[Fail]> = Arc::from(s);
}
#[test]
fn test_from_box() {
let b: Box<u32> = Box::new(123);
let r: Arc<u32> = Arc::from(b);
assert_eq!(*r, 123);
}
#[test]
fn test_from_box_str() {
let s = String::from("foo").into_boxed_str();
let r: Arc<str> = Arc::from(s);
assert_eq!(&r[..], "foo");
}
#[test]
fn test_from_box_slice() {
let s = vec![1, 2, 3].into_boxed_slice();
let r: Arc<[u32]> = Arc::from(s);
assert_eq!(&r[..], [1, 2, 3]);
}
#[test]
fn test_from_box_trait() {
use std::fmt::Display;
let b: Box<dyn Display> = Box::new(123);
let r: Arc<dyn Display> = Arc::from(b);
assert_eq!(r.to_string(), "123");
}
#[test]
fn test_from_box_trait_zero_sized() {
use std::fmt::Debug;
let b: Box<dyn Debug> = Box::new(());
let r: Arc<dyn Debug> = Arc::from(b);
assert_eq!(format!("{:?}", r), "()");
}
#[test]
fn test_from_vec() {
let v = vec![1, 2, 3];
let r: Arc<[u32]> = Arc::from(v);
assert_eq!(&r[..], [1, 2, 3]);
}
#[test]
fn test_downcast() {
use std::any::Any;
#[cfg(portable_atomic_unstable_coerce_unsized)]
let r1: Arc<dyn Any + Send + Sync> = Arc::new(i32::MAX);
// TODO: This is a workaround in case CoerceUnsized is not available - remove this once it is no longer needed
#[cfg(not(portable_atomic_unstable_coerce_unsized))]
let r1: Arc<dyn Any + Send + Sync> =
Arc::from(Box::new(i32::MAX) as Box<dyn Any + Send + Sync>);
#[cfg(portable_atomic_unstable_coerce_unsized)]
let r2: Arc<dyn Any + Send + Sync> = Arc::new("abc");
// TODO: This is a workaround in case CoerceUnsized is not available - remove this once it is no longer needed
#[cfg(not(portable_atomic_unstable_coerce_unsized))]
let r2: Arc<dyn Any + Send + Sync> =
Arc::from(Box::new("abc") as Box<dyn Any + Send + Sync>);
assert!(r1.clone().downcast::<u32>().is_err());
let r1i32 = r1.downcast::<i32>();
assert!(r1i32.is_ok());
assert_eq!(r1i32.unwrap(), Arc::new(i32::MAX));
assert!(r2.clone().downcast::<i32>().is_err());
let r2str = r2.downcast::<&'static str>();
assert!(r2str.is_ok());
assert_eq!(r2str.unwrap(), Arc::new("abc"));
}
#[test]
fn test_array_from_slice() {
let v = vec![1, 2, 3];
let r: Arc<[u32]> = Arc::from(v);
let a: Result<Arc<[u32; 3]>, _> = r.clone().try_into();
assert!(a.is_ok());
let a: Result<Arc<[u32; 2]>, _> = r.clone().try_into();
assert!(a.is_err());
}
#[test]
fn test_arc_cyclic_with_zero_refs() {
struct ZeroRefs {
inner: Weak<ZeroRefs>,
}
let zero_refs = Arc::new_cyclic(|inner| {
assert_eq!(inner.strong_count(), 0);
assert!(inner.upgrade().is_none());
ZeroRefs { inner: Weak::new() }
});
assert_eq!(Arc::strong_count(&zero_refs), 1);
assert_eq!(Arc::weak_count(&zero_refs), 0);
assert_eq!(zero_refs.inner.strong_count(), 0);
assert_eq!(zero_refs.inner.weak_count(), 0);
}
#[test]
fn test_arc_new_cyclic_one_ref() {
struct OneRef {
inner: Weak<OneRef>,
}
let one_ref = Arc::new_cyclic(|inner| {
assert_eq!(inner.strong_count(), 0);
assert!(inner.upgrade().is_none());
OneRef { inner: inner.clone() }
});
assert_eq!(Arc::strong_count(&one_ref), 1);
assert_eq!(Arc::weak_count(&one_ref), 1);
let one_ref2 = Weak::upgrade(&one_ref.inner).unwrap();
assert!(Arc::ptr_eq(&one_ref, &one_ref2));
assert_eq!(Arc::strong_count(&one_ref), 2);
assert_eq!(Arc::weak_count(&one_ref), 1);
}
#[test]
fn test_arc_cyclic_two_refs() {
struct TwoRefs {
inner1: Weak<TwoRefs>,
inner2: Weak<TwoRefs>,
}
let two_refs = Arc::new_cyclic(|inner| {
assert_eq!(inner.strong_count(), 0);
assert!(inner.upgrade().is_none());
let inner1 = inner.clone();
let inner2 = inner1.clone();
TwoRefs { inner1, inner2 }
});
assert_eq!(Arc::strong_count(&two_refs), 1);
assert_eq!(Arc::weak_count(&two_refs), 2);
let two_refs1 = Weak::upgrade(&two_refs.inner1).unwrap();
assert!(Arc::ptr_eq(&two_refs, &two_refs1));
let two_refs2 = Weak::upgrade(&two_refs.inner2).unwrap();
assert!(Arc::ptr_eq(&two_refs, &two_refs2));
assert_eq!(Arc::strong_count(&two_refs), 3);
assert_eq!(Arc::weak_count(&two_refs), 2);
}
/// Test for Arc::drop bug (https://github.com/rust-lang/rust/issues/55005)
#[test]
#[cfg(miri)] // relies on Stacked Borrows in Miri
fn arc_drop_dereferenceable_race() {
// The bug seems to take up to 700 iterations to reproduce with most seeds (tested 0-9).
for _ in 0..750 {
let arc_1 = Arc::new(());
let arc_2 = arc_1.clone();
let thread = thread::spawn(|| drop(arc_2));
// Spin a bit; makes the race more likely to appear
let mut i = 0;
while i < 256 {
i += 1;
}
drop(arc_1);
thread.join().unwrap();
}
}
}

136
vendor/portable-atomic-util/version.rs vendored Normal file
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@@ -0,0 +1,136 @@
// SPDX-License-Identifier: Apache-2.0 OR MIT
use std::{env, iter, process::Command, str};
pub(crate) fn rustc_version() -> Option<Version> {
let rustc = env::var_os("RUSTC")?;
let rustc_wrapper = if env::var_os("CARGO_ENCODED_RUSTFLAGS").is_some() {
env::var_os("RUSTC_WRAPPER").filter(|v| !v.is_empty())
} else {
// Cargo sets environment variables for wrappers correctly only since https://github.com/rust-lang/cargo/pull/9601.
None
};
// Do not apply RUSTC_WORKSPACE_WRAPPER: https://github.com/cuviper/autocfg/issues/58#issuecomment-2067625980
let mut rustc = rustc_wrapper.into_iter().chain(iter::once(rustc));
let mut cmd = Command::new(rustc.next().unwrap());
cmd.args(rustc);
// Use verbose version output because the packagers add extra strings to the normal version output.
// Do not use long flags (--version --verbose) because clippy-deriver doesn't handle them properly.
// -vV is also matched with that cargo internally uses: https://github.com/rust-lang/cargo/blob/0.80.0/src/cargo/util/rustc.rs#L65
let output = cmd.arg("-vV").output().ok()?;
let verbose_version = str::from_utf8(&output.stdout).ok()?;
Version::parse(verbose_version)
}
#[cfg_attr(test, derive(Debug, PartialEq))]
pub(crate) struct Version {
pub(crate) minor: u32,
pub(crate) nightly: bool,
commit_date: Date,
pub(crate) llvm: u32,
}
impl Version {
// The known latest stable version. If we unable to determine
// the rustc version, we assume this is the current version.
// It is no problem if this is older than the actual latest stable.
// LLVM version is assumed to be the minimum external LLVM version:
// https://github.com/rust-lang/rust/blob/1.82.0/src/bootstrap/src/core/build_steps/llvm.rs#L586
pub(crate) const LATEST: Self = Self::stable(82, 17);
pub(crate) const fn stable(rustc_minor: u32, llvm_major: u32) -> Self {
Self { minor: rustc_minor, nightly: false, commit_date: Date::UNKNOWN, llvm: llvm_major }
}
pub(crate) fn probe(&self, minor: u32, year: u16, month: u8, day: u8) -> bool {
if self.nightly {
self.minor > minor
|| self.minor == minor && self.commit_date >= Date::new(year, month, day)
} else {
self.minor >= minor
}
}
#[cfg(test)]
pub(crate) fn commit_date(&self) -> &Date {
&self.commit_date
}
pub(crate) fn parse(verbose_version: &str) -> Option<Self> {
let mut release = verbose_version
.lines()
.find(|line| line.starts_with("release: "))
.map(|line| &line["release: ".len()..])?
.splitn(2, '-');
let version = release.next().unwrap();
let channel = release.next().unwrap_or_default();
let mut digits = version.splitn(3, '.');
let major = digits.next()?;
if major != "1" {
return None;
}
let minor = digits.next()?.parse::<u32>().ok()?;
let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
let nightly = match env::var_os("RUSTC_BOOTSTRAP") {
// When -1 is passed rustc works like stable, e.g., cfg(target_feature = "unstable_target_feature") will never be set. https://github.com/rust-lang/rust/pull/132993
Some(ref v) if v == "-1" => false,
_ => channel == "nightly" || channel == "dev",
};
// Note that rustc 1.49-1.50 (and 1.13 or older) don't print LLVM version.
let llvm_major = (|| {
let version = verbose_version
.lines()
.find(|line| line.starts_with("LLVM version: "))
.map(|line| &line["LLVM version: ".len()..])?;
let mut digits = version.splitn(3, '.');
let major = digits.next()?.parse::<u32>().ok()?;
let _minor = digits.next()?.parse::<u32>().ok()?;
let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
Some(major)
})()
.unwrap_or(0);
// we don't refer commit date on stable/beta.
if nightly {
let commit_date = (|| {
let mut commit_date = verbose_version
.lines()
.find(|line| line.starts_with("commit-date: "))
.map(|line| &line["commit-date: ".len()..])?
.splitn(3, '-');
let year = commit_date.next()?.parse::<u16>().ok()?;
let month = commit_date.next()?.parse::<u8>().ok()?;
let day = commit_date.next()?.parse::<u8>().ok()?;
if month > 12 || day > 31 {
return None;
}
Some(Date::new(year, month, day))
})();
Some(Self {
minor,
nightly,
commit_date: commit_date.unwrap_or(Date::UNKNOWN),
llvm: llvm_major,
})
} else {
Some(Self::stable(minor, llvm_major))
}
}
}
#[derive(PartialEq, PartialOrd)]
#[cfg_attr(test, derive(Debug))]
pub(crate) struct Date {
pub(crate) year: u16,
pub(crate) month: u8,
pub(crate) day: u8,
}
impl Date {
const UNKNOWN: Self = Self::new(0, 0, 0);
const fn new(year: u16, month: u8, day: u8) -> Self {
Self { year, month, day }
}
}