--- /dev/null
+{
+ "git": {
+ "sha1": "591e44f01a1011c7a37108830402f38aac0a8e9c"
+ },
+ "path_in_vcs": ""
+}
\ No newline at end of file
--- /dev/null
+name: Rust
+
+on:
+ push:
+ branches: [main]
+ pull_request:
+ branches: [main]
+
+env:
+ CARGO_TERM_COLOR: always
+
+jobs:
+ build:
+ runs-on: ubuntu-latest
+
+ steps:
+ - uses: actions/checkout@v2
+ - name: Build
+ run: ./ci.sh
\ No newline at end of file
--- /dev/null
+target
\ No newline at end of file
--- /dev/null
+{
+ "editor.formatOnSave": true,
+ "rust-analyzer.checkOnSave.allTargets": false,
+ "rust-analyzer.cargo.target": "thumbv6m-none-eabi",
+ "rust-analyzer.procMacro.enable": true,
+ "rust-analyzer.imports.granularity.group": "module",
+ "rust-analyzer.imports.granularity.enforce": true,
+ "rust-analyzer.cargo.buildScripts.enable": true,
+}
\ No newline at end of file
--- /dev/null
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+No unreleased changes yet
+
+## 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
+
+## 0.1.10 - 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
--- /dev/null
+# 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 = "2021"
+name = "atomic-polyfill"
+version = "1.0.1"
+authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
+description = "Atomic polyfills, for targets where they're not available."
+readme = "README.md"
+categories = [
+ "embedded",
+ "no-std",
+ "concurrency",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/embassy-rs/atomic-polyfill"
+resolver = "2"
+
+[dependencies.critical-section]
+version = "1.0.0"
--- /dev/null
+[package]
+authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
+description = "Atomic polyfills, for targets where they're not available."
+edition = "2021"
+license = "MIT OR Apache-2.0"
+name = "atomic-polyfill"
+readme = "README.md"
+repository = "https://github.com/embassy-rs/atomic-polyfill"
+version = "1.0.1"
+
+categories = [
+ "embedded",
+ "no-std",
+ "concurrency",
+]
+
+[dependencies]
+critical-section = "1.0.0"
--- /dev/null
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
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+APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
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+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
--- /dev/null
+Copyright (c) 2020 Dario Nieuwenhuis
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
--- /dev/null
+# atomic-polyfill
+
+[](https://docs.rs/atomic-polyfill)
+
+This crate polyfills atomics on targets where they're not available, using critical sections. It is intended to be a drop-in replacement for `core::sync::atomic`.
+
+There are two "levels" of polyfilling:
+- Native: No polyfilling is performed, the native `core::sync::atomic::AtomicXX` is reexported.
+- Full: Both load/store and compare-and-set operations are polyfilled.
+
+Polyfilling requires a [`critical-section`](https://github.com/rust-embedded/critical-section) implementation for the current target. Check the `critical-section` README for details.
+
+## Target support
+
+The right polyfill level is automatically picked based on the target and the atomic width:
+
+| Target | Level | Level for u64/i64 |
+|--------------------|------------------|-------------------|
+| thumbv4t | Full | Full |
+| thumbv6m | Full | Full |
+| thumbv7*, thumbv8* | Native | Full |
+| riscv32imc | Full | Full |
+| riscv32imac | Native | Full |
+| xtensa-*-espidf | Native | Native |
+| xtensa-esp32-* | Native | Full |
+| xtensa-esp32s2-* | Full | Full |
+| xtensa-esp32s3-* | Native | Full |
+| xtensa-esp8266-* | Full | Full |
+| AVR | Full | Full |
+
+For targets not listed above, `atomic-polyfill` assumes nothing and reexports `core::sync::atomic::*`. No polyfilling is done. PRs for polyfilling more targets are welcome :)
+
+## License
+
+This work is licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+ http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+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.
--- /dev/null
+{
+ "arch": "avr",
+ "atomic-cas": false,
+ "cpu": "atmega328p",
+ "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+ "eh-frame-header": false,
+ "exe-suffix": ".elf",
+ "executables": true,
+ "late-link-args": {
+ "gcc": [
+ "-lgcc"
+ ]
+ },
+ "linker": "avr-gcc",
+ "linker-is-gnu": true,
+ "llvm-target": "avr-unknown-unknown",
+ "max-atomic-width": 8,
+ "no-default-libraries": false,
+ "pre-link-args": {
+ "gcc": [
+ "-mmcu=atmega328p",
+ "-Wl,--as-needed"
+ ]
+ },
+ "target-c-int-width": "16",
+ "target-pointer-width": "16"
+}
--- /dev/null
+use std::env;
+use std::fmt;
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum PolyfillLevel {
+ // Native, ie no polyfill. Just reexport from core::sync::atomic
+ Native,
+ // Full polyfill: polyfill both load/store and CAS with critical sections
+ Polyfill,
+}
+
+impl fmt::Display for PolyfillLevel {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let s = match *self {
+ Self::Native => "native",
+ Self::Polyfill => "polyfill",
+ };
+ write!(f, "{}", s)
+ }
+}
+
+fn main() {
+ let target = env::var("TARGET").unwrap();
+
+ use PolyfillLevel::*;
+
+ let patterns = [
+ ("riscv32imac-*", (Native, Polyfill)),
+ ("riscv32gc-*", (Native, Polyfill)),
+ ("riscv32imc-*-espidf", (Native, Native)),
+ ("riscv32*", (Polyfill, Polyfill)),
+ ("avr-*", (Polyfill, Polyfill)),
+ ("thumbv4t-*", (Polyfill, Polyfill)),
+ ("thumbv6m-*", (Polyfill, Polyfill)),
+ ("thumbv7m-*", (Native, Polyfill)),
+ ("thumbv7em-*", (Native, Polyfill)),
+ ("thumbv8m.base-*", (Native, Polyfill)),
+ ("thumbv8m.main-*", (Native, Polyfill)),
+ ("xtensa-*-espidf", (Native, Native)),
+ ("xtensa-esp32-*", (Native, Polyfill)),
+ ("xtensa-esp32s2-*", (Polyfill, Polyfill)),
+ ("xtensa-esp32s3-*", (Native, Polyfill)),
+ ("xtensa-esp8266-*", (Polyfill, Polyfill)),
+ ];
+
+ if let Some((_, (level, level64))) = patterns
+ .iter()
+ .find(|(pattern, _)| matches(pattern, &target))
+ {
+ if *level == PolyfillLevel::Polyfill {
+ println!("cargo:rustc-cfg=polyfill_u8");
+ println!("cargo:rustc-cfg=polyfill_u16");
+ println!("cargo:rustc-cfg=polyfill_u32");
+ println!("cargo:rustc-cfg=polyfill_usize");
+ println!("cargo:rustc-cfg=polyfill_i8");
+ println!("cargo:rustc-cfg=polyfill_i16");
+ println!("cargo:rustc-cfg=polyfill_i32");
+ println!("cargo:rustc-cfg=polyfill_isize");
+ println!("cargo:rustc-cfg=polyfill_ptr");
+ println!("cargo:rustc-cfg=polyfill_bool");
+ }
+
+ if *level64 == PolyfillLevel::Polyfill {
+ println!("cargo:rustc-cfg=polyfill_u64");
+ println!("cargo:rustc-cfg=polyfill_i64");
+ }
+ } else {
+ // If we don't know about the target, just reexport the entire `core::atomic::*`
+ // This doesn't polyfill anything, but it's guaranteed to never fail build.
+ println!("cargo:rustc-cfg=reexport_core");
+ }
+}
+
+// tiny glob replacement to avoid pulling in more crates.
+// Supports 0 or 1 wildcards `*`
+fn matches(pattern: &str, val: &str) -> bool {
+ if let Some(p) = pattern.find('*') {
+ let prefix = &pattern[..p];
+ let suffix = &pattern[p + 1..];
+ val.len() >= prefix.len() + suffix.len() && val.starts_with(prefix) && val.ends_with(suffix)
+ } else {
+ val == pattern
+ }
+}
--- /dev/null
+#!/bin/bash
+
+set -euxo pipefail
+
+cargo build
+cargo build --target thumbv6m-none-eabi
+cargo build --target thumbv7em-none-eabi
+cargo build --target riscv32imc-unknown-none-elf
+cargo build --target riscv32imac-unknown-none-elf
+cargo build --target i686-unknown-linux-gnu
+cargo build --target x86_64-unknown-linux-gnu
+cargo build --target riscv64gc-unknown-linux-gnu
+
+# without --release, it fails with "error: ran out of registers during register allocation"
+cargo build --release -Zbuild-std=core --target avr-specs/avr-atmega328p.json
--- /dev/null
+# Before upgrading check that everything is available on all tier1 targets here:
+# https://rust-lang.github.io/rustup-components-history
+[toolchain]
+channel = "nightly-2022-07-28"
+components = [ "rust-src", "rustfmt" ]
+targets = [
+ "thumbv6m-none-eabi",
+ "thumbv7em-none-eabi",
+ "riscv32imc-unknown-none-elf",
+ "riscv32imac-unknown-none-elf",
+ "i686-unknown-linux-gnu",
+ "x86_64-unknown-linux-gnu",
+ "riscv64gc-unknown-linux-gnu",
+]
--- /dev/null
+#![no_std]
+
+#[cfg(reexport_core)]
+pub use core::sync::atomic::*;
+
+#[cfg(not(reexport_core))]
+mod polyfill;
+#[cfg(not(reexport_core))]
+pub use polyfill::*;
--- /dev/null
+pub use core::sync::atomic::{compiler_fence, fence, Ordering};
+
+macro_rules! atomic_int {
+ ($int_type:ident,$atomic_type:ident, $cfg:ident) => {
+ #[cfg(not($cfg))]
+ pub use core::sync::atomic::$atomic_type;
+
+ #[cfg($cfg)]
+ #[repr(transparent)]
+ pub struct $atomic_type {
+ inner: core::cell::UnsafeCell<$int_type>,
+ }
+
+ #[cfg($cfg)]
+ unsafe impl Send for $atomic_type {}
+ #[cfg($cfg)]
+ unsafe impl Sync for $atomic_type {}
+ #[cfg($cfg)]
+ impl core::panic::RefUnwindSafe for $atomic_type {}
+
+ #[cfg($cfg)]
+ impl Default for $atomic_type {
+ #[inline]
+ fn default() -> Self {
+ Self::new(Default::default())
+ }
+ }
+
+ #[cfg($cfg)]
+ impl From<$int_type> for $atomic_type {
+ #[inline]
+ fn from(v: $int_type) -> Self {
+ Self::new(v)
+ }
+ }
+
+ #[cfg($cfg)]
+ impl core::fmt::Debug for $atomic_type {
+ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+ core::fmt::Debug::fmt(&self.load(Ordering::SeqCst), f)
+ }
+ }
+
+ #[cfg($cfg)]
+ impl $atomic_type {
+ pub const fn new(v: $int_type) -> Self {
+ Self {
+ inner: core::cell::UnsafeCell::new(v),
+ }
+ }
+
+ pub fn into_inner(self) -> $int_type {
+ self.inner.into_inner()
+ }
+
+ pub fn get_mut(&mut self) -> &mut $int_type {
+ self.inner.get_mut()
+ }
+
+ pub fn load(&self, _order: Ordering) -> $int_type {
+ return critical_section::with(|_| unsafe { *self.inner.get() });
+ }
+
+ pub fn store(&self, val: $int_type, _order: Ordering) {
+ return critical_section::with(|_| unsafe { *self.inner.get() = val });
+ }
+
+ pub fn swap(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |_| val)
+ }
+
+ pub fn compare_exchange(
+ &self,
+ current: $int_type,
+ new: $int_type,
+ success: Ordering,
+ failure: Ordering,
+ ) -> Result<$int_type, $int_type> {
+ self.compare_exchange_weak(current, new, success, failure)
+ }
+
+ pub fn compare_exchange_weak(
+ &self,
+ current: $int_type,
+ new: $int_type,
+ _success: Ordering,
+ _failure: Ordering,
+ ) -> Result<$int_type, $int_type> {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if old == current {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ pub fn fetch_add(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old.wrapping_add(val))
+ }
+
+ pub fn fetch_sub(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old.wrapping_sub(val))
+ }
+
+ pub fn fetch_and(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old & val)
+ }
+
+ pub fn fetch_nand(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| !(old & val))
+ }
+
+ pub fn fetch_or(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old | val)
+ }
+
+ pub fn fetch_xor(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old ^ val)
+ }
+
+ pub fn fetch_update<F>(
+ &self,
+ _set_order: Ordering,
+ _fetch_order: Ordering,
+ mut f: F,
+ ) -> Result<$int_type, $int_type>
+ where
+ F: FnMut($int_type) -> Option<$int_type>,
+ {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if let Some(new) = f(old) {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ pub fn fetch_max(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old.max(val))
+ }
+
+ pub fn fetch_min(&self, val: $int_type, order: Ordering) -> $int_type {
+ self.op(order, |old| old.min(val))
+ }
+
+ fn op(&self, _order: Ordering, f: impl FnOnce($int_type) -> $int_type) -> $int_type {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ *val = f(old);
+ old
+ })
+ }
+ }
+ };
+}
+
+atomic_int!(u8, AtomicU8, polyfill_u8);
+atomic_int!(u16, AtomicU16, polyfill_u16);
+atomic_int!(u32, AtomicU32, polyfill_u32);
+atomic_int!(u64, AtomicU64, polyfill_u64);
+atomic_int!(usize, AtomicUsize, polyfill_usize);
+atomic_int!(i8, AtomicI8, polyfill_i8);
+atomic_int!(i16, AtomicI16, polyfill_i16);
+atomic_int!(i32, AtomicI32, polyfill_i32);
+atomic_int!(i64, AtomicI64, polyfill_i64);
+atomic_int!(isize, AtomicIsize, polyfill_isize);
+
+#[cfg(not(polyfill_bool))]
+pub use core::sync::atomic::AtomicBool;
+
+#[cfg(polyfill_bool)]
+#[repr(transparent)]
+pub struct AtomicBool {
+ inner: core::cell::UnsafeCell<bool>,
+}
+
+#[cfg(polyfill_bool)]
+impl Default for AtomicBool {
+ /// Creates an `AtomicBool` initialized to `false`.
+ #[inline]
+ fn default() -> Self {
+ Self::new(false)
+ }
+}
+
+#[cfg(polyfill_bool)]
+impl From<bool> for AtomicBool {
+ #[inline]
+ fn from(v: bool) -> Self {
+ Self::new(v)
+ }
+}
+
+#[cfg(polyfill_bool)]
+impl core::fmt::Debug for AtomicBool {
+ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+ core::fmt::Debug::fmt(&self.load(Ordering::SeqCst), f)
+ }
+}
+
+#[cfg(polyfill_bool)]
+unsafe impl Send for AtomicBool {}
+#[cfg(polyfill_bool)]
+unsafe impl Sync for AtomicBool {}
+#[cfg(polyfill_bool)]
+impl core::panic::RefUnwindSafe for AtomicBool {}
+
+#[cfg(polyfill_bool)]
+impl AtomicBool {
+ pub const fn new(v: bool) -> AtomicBool {
+ Self {
+ inner: core::cell::UnsafeCell::new(v),
+ }
+ }
+
+ pub fn into_inner(self) -> bool {
+ self.inner.into_inner()
+ }
+
+ pub fn get_mut(&mut self) -> &mut bool {
+ self.inner.get_mut()
+ }
+
+ pub fn load(&self, _order: Ordering) -> bool {
+ return critical_section::with(|_| unsafe { *self.inner.get() });
+ }
+
+ pub fn store(&self, val: bool, _order: Ordering) {
+ return critical_section::with(|_| unsafe { *self.inner.get() = val });
+ }
+
+ pub fn swap(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |_| val)
+ }
+
+ pub fn compare_exchange(
+ &self,
+ current: bool,
+ new: bool,
+ success: Ordering,
+ failure: Ordering,
+ ) -> Result<bool, bool> {
+ self.compare_exchange_weak(current, new, success, failure)
+ }
+
+ pub fn compare_exchange_weak(
+ &self,
+ current: bool,
+ new: bool,
+ _success: Ordering,
+ _failure: Ordering,
+ ) -> Result<bool, bool> {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if old == current {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ pub fn fetch_and(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| old & val)
+ }
+
+ pub fn fetch_nand(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| !(old & val))
+ }
+
+ pub fn fetch_or(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| old | val)
+ }
+
+ pub fn fetch_xor(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| old ^ val)
+ }
+
+ pub fn fetch_update<F>(
+ &self,
+ _set_order: Ordering,
+ _fetch_order: Ordering,
+ mut f: F,
+ ) -> Result<bool, bool>
+ where
+ F: FnMut(bool) -> Option<bool>,
+ {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if let Some(new) = f(old) {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ pub fn fetch_max(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| old.max(val))
+ }
+
+ pub fn fetch_min(&self, val: bool, order: Ordering) -> bool {
+ self.op(order, |old| old.min(val))
+ }
+
+ fn op(&self, _order: Ordering, f: impl FnOnce(bool) -> bool) -> bool {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ *val = f(old);
+ old
+ })
+ }
+}
+
+#[cfg(not(polyfill_ptr))]
+pub use core::sync::atomic::AtomicPtr;
+
+#[cfg(polyfill_ptr)]
+#[repr(transparent)]
+pub struct AtomicPtr<T> {
+ inner: core::cell::UnsafeCell<*mut T>,
+}
+
+#[cfg(polyfill_ptr)]
+impl<T> Default for AtomicPtr<T> {
+ /// Creates a null `AtomicPtr<T>`.
+ #[inline]
+ fn default() -> Self {
+ Self::new(core::ptr::null_mut())
+ }
+}
+
+#[cfg(polyfill_ptr)]
+impl<T> From<*mut T> for AtomicPtr<T> {
+ #[inline]
+ fn from(v: *mut T) -> Self {
+ Self::new(v)
+ }
+}
+
+#[cfg(polyfill_ptr)]
+impl<T> core::fmt::Debug for AtomicPtr<T> {
+ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+ core::fmt::Debug::fmt(&self.load(Ordering::SeqCst), f)
+ }
+}
+
+#[cfg(polyfill_ptr)]
+impl<T> core::fmt::Pointer for AtomicPtr<T> {
+ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+ core::fmt::Pointer::fmt(&self.load(Ordering::SeqCst), f)
+ }
+}
+
+#[cfg(polyfill_ptr)]
+unsafe impl<T> Sync for AtomicPtr<T> {}
+#[cfg(polyfill_ptr)]
+unsafe impl<T> Send for AtomicPtr<T> {}
+#[cfg(polyfill_ptr)]
+impl<T> core::panic::RefUnwindSafe for AtomicPtr<T> {}
+
+#[cfg(polyfill_ptr)]
+impl<T> AtomicPtr<T> {
+ pub const fn new(v: *mut T) -> AtomicPtr<T> {
+ Self {
+ inner: core::cell::UnsafeCell::new(v),
+ }
+ }
+
+ pub fn into_inner(self) -> *mut T {
+ self.inner.into_inner()
+ }
+
+ pub fn get_mut(&mut self) -> &mut *mut T {
+ self.inner.get_mut()
+ }
+
+ pub fn load(&self, _order: Ordering) -> *mut T {
+ return critical_section::with(|_| unsafe { *self.inner.get() });
+ }
+
+ pub fn store(&self, val: *mut T, _order: Ordering) {
+ return critical_section::with(|_| unsafe { *self.inner.get() = val });
+ }
+
+ pub fn swap(&self, val: *mut T, order: Ordering) -> *mut T {
+ self.op(order, |_| val)
+ }
+
+ pub fn compare_exchange(
+ &self,
+ current: *mut T,
+ new: *mut T,
+ success: Ordering,
+ failure: Ordering,
+ ) -> Result<*mut T, *mut T> {
+ self.compare_exchange_weak(current, new, success, failure)
+ }
+
+ pub fn compare_exchange_weak(
+ &self,
+ current: *mut T,
+ new: *mut T,
+ _success: Ordering,
+ _failure: Ordering,
+ ) -> Result<*mut T, *mut T> {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if old == current {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ pub fn fetch_update<F>(
+ &self,
+ _set_order: Ordering,
+ _fetch_order: Ordering,
+ mut f: F,
+ ) -> Result<*mut T, *mut T>
+ where
+ F: FnMut(*mut T) -> Option<*mut T>,
+ {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ if let Some(new) = f(old) {
+ *val = new;
+ Ok(old)
+ } else {
+ Err(old)
+ }
+ })
+ }
+
+ fn op(&self, _order: Ordering, f: impl FnOnce(*mut T) -> *mut T) -> *mut T {
+ critical_section::with(|_| {
+ let val = unsafe { &mut *self.inner.get() };
+ let old = *val;
+ *val = f(old);
+ old
+ })
+ }
+}
projects / platform / upstream / rust-atomic-polyfill.git / commitdiff