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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

No unreleased changes yet

1.0.3 - 2023-07-11

  • Crate is deprecated, use portable-atomic instead.

1.0.2 - 2023-03-12

  • Add MSP430 support.

1.0.1 - 2022-08-12

  • Fix AtomicPtr accidentally not being available when not polyfilled.

1.0.0 - 2022-08-12

  • Update to critical-section v1.0

0.1.11 - 2022-11-29

  • Bump critical-section dependency from 0.2 to 1.0.

    This is a breaking change if you were relying on the default implementations available on critical-section 0.2.7 and earlier. They have been removed in critical-section 0.2.8 because they were unsound, since there's no way to guarantee they're correct for the target in use (for example for multi-core embedded targets). Since critical-section 0.2.8 just forwards to 1.0 now, we decided to change atomic-polyfill to use 1.0 directly.

    If you're seeing a linker error like undefined symbol: _critical_section_1_0_acquire, you're affected. To fix it:

    • If your target supports std: Add the critical-section dependency to Cargo.toml enabling the std feature.

      [dependencies]
      critical-section = { version = "1.1", features = ["std"]}
    • For single-core Cortex-M targets in privileged mode:

      [dependencies]
      cortex-m = { version = "0.7.6", features = ["critical-section-single-core"]}
    • For single-hart RISC-V targets in privileged mode:

      [dependencies]
      riscv = { version = "0.10", features = ["critical-section-single-hart"]}
    • For other targets: check if your HAL or architecture-support crate has a critical-section 1.0 implementation available. Otherwise, provide your own.

0.1.10 - 2022-08-12

  • Fix AtomicPtr accidentally not being available when not polyfilled.

0.1.9 - 2022-08-12

  • Switch to only two polyfill levels.

The "CAS" level which uses atomic load/store and critical-section based CAS was not sound, because critical-section guarantees only "no other critical section can run concurrently", not "no other code can run concurrently". Therefore a CS-based CAS can still race a native atomic store.

0.1.8 - 2022-04-12

  • Added AVR support.

0.1.7 - 2022-03-22

  • Added support for xtensa (ESP chips), with and without ESP-IDF.
  • Reexport core::sync::atomic::* as-is for unknown targets, to avoid build failures if they don't have full atomic support.

0.1.6 - 2022-02-08

  • Add polyfill support for thumbv4t targets. (Nintendo Game Boy Advance)
  • Added get_mut() to AtomicBool.
  • Added into_inner() to all atomics
  • Added fmt::Debug impl to AtomicBool, AtomicPtr.
  • Added fmt::Pointer impl to AtomicPtr.
  • Added From<*mut T> impl to AtomicPtr.
  • Added RefUnwindSafe impl to all atomics.

0.1.5 - 2021-11-02

  • Updated critical-section to v0.2.5. Fixes std implementation to allow reentrant (nested) critical sections. This would previously deadlock.

0.1.4 - 2021-09-20

  • Added support for RISC-V.
  • Added support for "full polyfill" level, where load/stores are polyfilled, not just CAS operations.
  • Added support for AtomicU64, AtomicI64.

0.1.3 - 2021-08-07

  • Only import cortex-m when needed (#4)
  • Fix panic on fetch_update due to incorrect ordering (#5)

0.1.2 - 2021-03-29

  • Added missing reexport of fence and compiler_fence in polyfilled mode.

0.1.1 - 2021-03-04

  • Added polyfills for AtomicU8, AtomicU16, AtomicUsize, AtomicI8, AtomicI16, AtomicI32, AtomicIsize

0.1.0 - 2021-03-04

  • First release