• Implement serde serialization and deserialization for Arc, gated behind "serde" feature. (#2, thanks @tommasoclini)

portable-atomic-util has been extracted from the portable-atomic repository into its own repository: https://github.com/taiki-e/portable-atomic-util

• Add Arc::{new_zeroed,new_zeroed_slice} at Rust 1.36+. (align to the std Arc change in Rust 1.92) (f8affb6, ae5aba7)

• Implement Default for Pin<Arc<T>: Default>. (align to the std Arc change in Rust 1.91) (2d8d33c)

• Implement From<&mut {[T],str}> for Arc<{[T],str}> at Rust 1.36+. (align to the std Arc change in Rust 1.84) (99640d6, ae5aba7)

• Implement {AsFd, AsRawFd} for Arc<T> on Trusty. (1b09ffb)

• Support slice-related methods that previously required Rust 1.44+ at Rust 1.36+. (ae5aba7)

• Support AsRawFd for Arc<T> implementation on Unix in all Rust versions. Previously, it was only for Rust 1.63+. (1b09ffb)

• Fix build error when building for HermitOS with std feature in Rust 1.63-1.68. (1b09ffb)

• Documentation improvements.

• Enable release immutability.

• Add unstable portable_atomic_unstable_coerce_unsized cfg (requires Rust nightly). (#195, thanks @brodycj)

• Respect RUSTC_BOOTSTRAP=-1 recently added in nightly in rustc version detection. (5b2847a)

• Add Arc::{new_uninit,assume_init} at Rust 1.36+ and Arc::new_uninit_slice at Rust 1.44+. (align to the std Arc change in Rust 1.82) (362dc9a)

• Support make_mut on Arc<[T]> and Arc<str> at Rust 1.36+. (align to the std Arc change in Rust 1.81) (362dc9a)

• Fix build issue with esp toolchain. (f8ea85e)

• Support impl Error for Arc<T: Error> in no-std at Rust 1.81+. (30b9f90)

• Implement Default for Arc<[T]> and Arc<str> at Rust 1.51+. (align to the std Arc change in Rust 1.80) (c6ee296)

• Implement {AsFd, AsRawFd} for Arc<T> on HermitOS. (b778244)

• Rewrite Arc based on std::sync::Arc's implementation. (#142)

  This fixes accidental API differences with std (#139, #140) and adds many missing APIs compared to std:

  • Add Arc::{downcast, into_inner, make_mut, new_cyclic} (#142)
  • Implement {fmt::Display, fmt::Pointer, Error, From<T>, From<Box<T>>, From<Cow<'a,T>>, AsFd, AsRawFd, AsHandle, AsSocket} for Arc<T> (#142, 78690d7, aba0930)
  • Implement {From<&[T]>, From<Vec<T>>, From<[T; N]>, FromIterator<T>} for Arc<[T]> (#142, 5e9f693)
  • Implement TryFrom<Arc<[T]>> for Arc<[T; N]> (#142)
  • Implement From<Arc<str>> for Arc<[u8]> (#142)
  • Implement {From<&str>, From<String>} for Arc<str> (#142)
  • Implement {Read, Write, Seek} for Arc<File> (591ece5)
  • Remove T: UnwindSafe bound from impl UnwindSafe for Arc<T> (#142)

• Add task::Wake. (#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.

• Improve offset calculation in Arc::{into_raw,as_ptr,from_ptr}. (#141, thanks @gtsiam)

• Fix a bug where Arc::{into_raw,as_ptr} returned invalid pointers for larger alignment types. (#138, thanks @notgull)