atomic-0.5.1/.cargo_vcs_info.json0000644000000001120000000000100123050ustar { "git": { "sha1": "4902333f255c3b0292da40f8a9ea6cb17e8fcd14" } } atomic-0.5.1/.gitignore000064400000000000000000000000220072674642500131150ustar 00000000000000target Cargo.lock atomic-0.5.1/.travis.yml000064400000000000000000000005730072674642500132510ustar 00000000000000language: rust sudo: false rust: - nightly - beta - stable - 1.45.0 script: - cargo build - cargo test - cargo doc - if [ $TRAVIS_RUST_VERSION = nightly ]; then rustup target add aarch64-unknown-none; fi - if [ $TRAVIS_RUST_VERSION = nightly ]; then RUSTFLAGS="-Zcrate-attr=feature(integer_atomics)" cargo check --target=aarch64-unknown-none; fi notifications: email: false atomic-0.5.1/Cargo.toml0000644000000016430000000000100103150ustar # 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" name = "atomic" version = "0.5.1" authors = ["Amanieu d'Antras "] description = "Generic Atomic wrapper type" documentation = "https://amanieu.github.io/atomic-rs/atomic/index.html" readme = "README.md" keywords = ["atomic", "no_std"] license = "Apache-2.0/MIT" repository = "https://github.com/Amanieu/atomic-rs" [build-dependencies.autocfg] version = "1" [features] default = ["fallback"] fallback = [] std = [] atomic-0.5.1/Cargo.toml.orig000064400000000000000000000007110072674642500140210ustar 00000000000000[package] name = "atomic" version = "0.5.1" edition = "2018" authors = ["Amanieu d'Antras "] description = "Generic Atomic wrapper type" documentation = "https://amanieu.github.io/atomic-rs/atomic/index.html" license = "Apache-2.0/MIT" repository = "https://github.com/Amanieu/atomic-rs" readme = "README.md" keywords = ["atomic", "no_std"] [features] default = ["fallback"] std = [] fallback = [] [build-dependencies] autocfg = "1" atomic-0.5.1/LICENSE-APACHE000064400000000000000000000251370072674642500130670ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. atomic-0.5.1/LICENSE-MIT000064400000000000000000000020570072674642500125730ustar 00000000000000Copyright (c) 2016 The Rust Project Developers 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. 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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. atomic-0.5.1/README.md000064400000000000000000000031250072674642500124130ustar 00000000000000Generic `Atomic` for Rust ============================ [![Build Status](https://travis-ci.org/Amanieu/atomic-rs.svg?branch=master)](https://travis-ci.org/Amanieu/atomic-rs) [![Crates.io](https://img.shields.io/crates/v/atomic.svg)](https://crates.io/crates/atomic) A Rust library which provides a generic `Atomic` type for all `T: Copy` types, unlike the standard library which only provides a few fixed atomic types (`AtomicBool`, `AtomicIsize`, `AtomicUsize`, `AtomicPtr`). This library will use native atomic instructions if possible, and will otherwise fall back to a lock-based mechanism. You can use the `Atomic::::is_lock_free()` function to check whether native atomic operations are supported for a given type. Note that a type must have a power-of-2 size and alignment in order to be used by native atomic instructions. This crate uses `#![no_std]` and only depends on libcore. [Documentation](https://amanieu.github.io/atomic-rs/atomic/index.html) ## Usage Add this to your `Cargo.toml`: ```toml [dependencies] atomic = "0.5" ``` and this to your crate root: ```rust extern crate atomic; ``` ## License 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. atomic-0.5.1/build.rs000064400000000000000000000010030072674642500125720ustar 00000000000000fn main() { let ac = autocfg::new(); for root in &["core", "std"] { for size in &[8, 16, 32, 64, 128] { ac.emit_expression_cfg( &format!("{}::sync::atomic::AtomicU{}::compare_exchange", root, size), &format!("has_atomic_u{}", size), ); ac.emit_expression_cfg( &format!("{}::sync::atomic::AtomicI{}::compare_exchange", root, size), &format!("has_atomic_i{}", size), ); } } } atomic-0.5.1/src/fallback.rs000064400000000000000000000134240072674642500140330ustar 00000000000000// Copyright 2016 Amanieu d'Antras // // Licensed under the Apache License, Version 2.0, or the MIT license , at your option. This file may not be // copied, modified, or distributed except according to those terms. use core::cmp; use core::mem; use core::num::Wrapping; use core::ops; use core::ptr; use core::slice; use core::sync::atomic::{self, AtomicUsize, Ordering}; // We use an AtomicUsize instead of an AtomicBool because it performs better // on architectures that don't have byte-sized atomics. // // We give each spinlock its own cache line to avoid false sharing. #[repr(align(64))] struct SpinLock(AtomicUsize); impl SpinLock { fn lock(&self) { while self .0 .compare_exchange_weak(0, 1, Ordering::Acquire, Ordering::Relaxed) .is_err() { while self.0.load(Ordering::Relaxed) != 0 { atomic::spin_loop_hint(); } } } fn unlock(&self) { self.0.store(0, Ordering::Release); } } // A big array of spinlocks which we use to guard atomic accesses. A spinlock is // chosen based on a hash of the address of the atomic object, which helps to // reduce contention compared to a single global lock. macro_rules! array { (@accum (0, $($_es:expr),*) -> ($($body:tt)*)) => {array!(@as_expr [$($body)*])}; (@accum (1, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (0, $($es),*) -> ($($body)* $($es,)*))}; (@accum (2, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (0, $($es),*) -> ($($body)* $($es,)* $($es,)*))}; (@accum (4, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (2, $($es,)* $($es),*) -> ($($body)*))}; (@accum (8, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (4, $($es,)* $($es),*) -> ($($body)*))}; (@accum (16, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (8, $($es,)* $($es),*) -> ($($body)*))}; (@accum (32, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (16, $($es,)* $($es),*) -> ($($body)*))}; (@accum (64, $($es:expr),*) -> ($($body:tt)*)) => {array!(@accum (32, $($es,)* $($es),*) -> ($($body)*))}; (@as_expr $e:expr) => {$e}; [$e:expr; $n:tt] => { array!(@accum ($n, $e) -> ()) }; } static SPINLOCKS: [SpinLock; 64] = array![SpinLock(AtomicUsize::new(0)); 64]; // Spinlock pointer hashing function from compiler-rt #[inline] fn lock_for_addr(addr: usize) -> &'static SpinLock { // Disregard the lowest 4 bits. We want all values that may be part of the // same memory operation to hash to the same value and therefore use the same // lock. let mut hash = addr >> 4; // Use the next bits as the basis for the hash let low = hash & (SPINLOCKS.len() - 1); // Now use the high(er) set of bits to perturb the hash, so that we don't // get collisions from atomic fields in a single object hash >>= 16; hash ^= low; // Return a pointer to the lock to use &SPINLOCKS[hash & (SPINLOCKS.len() - 1)] } #[inline] fn lock(addr: usize) -> LockGuard { let lock = lock_for_addr(addr); lock.lock(); LockGuard(lock) } struct LockGuard(&'static SpinLock); impl Drop for LockGuard { #[inline] fn drop(&mut self) { self.0.unlock(); } } #[inline] pub unsafe fn atomic_load(dst: *mut T) -> T { let _l = lock(dst as usize); ptr::read(dst) } #[inline] pub unsafe fn atomic_store(dst: *mut T, val: T) { let _l = lock(dst as usize); ptr::write(dst, val); } #[inline] pub unsafe fn atomic_swap(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); ptr::replace(dst, val) } #[inline] pub unsafe fn atomic_compare_exchange(dst: *mut T, current: T, new: T) -> Result { let _l = lock(dst as usize); let result = ptr::read(dst); // compare_exchange compares with memcmp instead of Eq let a = slice::from_raw_parts(&result as *const _ as *const u8, mem::size_of_val(&result)); let b = slice::from_raw_parts( ¤t as *const _ as *const u8, mem::size_of_val(¤t), ); if a == b { ptr::write(dst, new); Ok(result) } else { Err(result) } } #[inline] pub unsafe fn atomic_add(dst: *mut T, val: T) -> T where Wrapping: ops::Add>, { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, (Wrapping(result) + Wrapping(val)).0); result } #[inline] pub unsafe fn atomic_sub(dst: *mut T, val: T) -> T where Wrapping: ops::Sub>, { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, (Wrapping(result) - Wrapping(val)).0); result } #[inline] pub unsafe fn atomic_and>(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, result & val); result } #[inline] pub unsafe fn atomic_or>(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, result | val); result } #[inline] pub unsafe fn atomic_xor>(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, result ^ val); result } #[inline] pub unsafe fn atomic_min(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, cmp::min(result, val)); result } #[inline] pub unsafe fn atomic_max(dst: *mut T, val: T) -> T { let _l = lock(dst as usize); let result = ptr::read(dst); ptr::write(dst, cmp::max(result, val)); result } atomic-0.5.1/src/lib.rs000064400000000000000000000640470072674642500130510ustar 00000000000000// Copyright 2016 Amanieu d'Antras // // Licensed under the Apache License, Version 2.0, or the MIT license , at your option. This file may not be // copied, modified, or distributed except according to those terms. //! Generic `Atomic` wrapper type //! //! Atomic types provide primitive shared-memory communication between //! threads, and are the building blocks of other concurrent types. //! //! This library defines a generic atomic wrapper type `Atomic` for all //! `T: Copy` types. //! Atomic types present operations that, when used correctly, synchronize //! updates between threads. //! //! Each method takes an `Ordering` which represents the strength of //! the memory barrier for that operation. These orderings are the //! same as [LLVM atomic orderings][1]. //! //! [1]: http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations //! //! Atomic variables are safe to share between threads (they implement `Sync`) //! but they do not themselves provide the mechanism for sharing. The most //! common way to share an atomic variable is to put it into an `Arc` (an //! atomically-reference-counted shared pointer). //! //! Most atomic types may be stored in static variables, initialized using //! the `const fn` constructors. Atomic statics are often used for lazy global //! initialization. #![warn(missing_docs)] #![warn(rust_2018_idioms)] #![no_std] #[cfg(any(test, feature = "std"))] #[macro_use] extern crate std; // Re-export some useful definitions from libcore pub use core::sync::atomic::{fence, Ordering}; use core::cell::UnsafeCell; use core::fmt; #[cfg(feature = "std")] use std::panic::RefUnwindSafe; #[cfg(feature = "fallback")] mod fallback; mod ops; /// A generic atomic wrapper type which allows an object to be safely shared /// between threads. #[repr(transparent)] pub struct Atomic { v: UnsafeCell, } // Atomic is only Sync if T is Send unsafe impl Sync for Atomic {} // Given that atomicity is guaranteed, Atomic is RefUnwindSafe if T is // // This is trivially correct for native lock-free atomic types. For those whose // atomicity is emulated using a spinlock, it is still correct because the // `Atomic` API does not allow doing any panic-inducing operation after writing // to the target object. #[cfg(feature = "std")] impl RefUnwindSafe for Atomic {} impl Default for Atomic { #[inline] fn default() -> Self { Self::new(Default::default()) } } impl fmt::Debug for Atomic { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_tuple("Atomic") .field(&self.load(Ordering::SeqCst)) .finish() } } impl Atomic { /// Creates a new `Atomic`. #[inline] pub const fn new(v: T) -> Atomic { Atomic { v: UnsafeCell::new(v), } } /// Checks if `Atomic` objects of this type are lock-free. /// /// If an `Atomic` is not lock-free then it may be implemented using locks /// internally, which makes it unsuitable for some situations (such as /// communicating with a signal handler). #[inline] pub const fn is_lock_free() -> bool { ops::atomic_is_lock_free::() } } impl Atomic { /// Returns a mutable reference to the underlying type. /// /// This is safe because the mutable reference guarantees that no other threads are /// concurrently accessing the atomic data. #[inline] pub fn get_mut(&mut self) -> &mut T { unsafe { &mut *self.v.get() } } /// Consumes the atomic and returns the contained value. /// /// This is safe because passing `self` by value guarantees that no other threads are /// concurrently accessing the atomic data. #[inline] pub fn into_inner(self) -> T { self.v.into_inner() } /// Loads a value from the `Atomic`. /// /// `load` takes an `Ordering` argument which describes the memory ordering /// of this operation. /// /// # Panics /// /// Panics if `order` is `Release` or `AcqRel`. #[inline] pub fn load(&self, order: Ordering) -> T { unsafe { ops::atomic_load(self.v.get(), order) } } /// Stores a value into the `Atomic`. /// /// `store` takes an `Ordering` argument which describes the memory ordering /// of this operation. /// /// # Panics /// /// Panics if `order` is `Acquire` or `AcqRel`. #[inline] pub fn store(&self, val: T, order: Ordering) { unsafe { ops::atomic_store(self.v.get(), val, order); } } /// Stores a value into the `Atomic`, returning the old value. /// /// `swap` takes an `Ordering` argument which describes the memory ordering /// of this operation. #[inline] pub fn swap(&self, val: T, order: Ordering) -> T { unsafe { ops::atomic_swap(self.v.get(), val, order) } } /// Stores a value into the `Atomic` if the current value is the same as the /// `current` value. /// /// The return value is a result indicating whether the new value was /// written and containing the previous value. On success this value is /// guaranteed to be equal to `new`. /// /// `compare_exchange` takes two `Ordering` arguments to describe the memory /// ordering of this operation. The first describes the required ordering if /// the operation succeeds while the second describes the required ordering /// when the operation fails. The failure ordering can't be `Release` or /// `AcqRel` and must be equivalent or weaker than the success ordering. #[inline] pub fn compare_exchange( &self, current: T, new: T, success: Ordering, failure: Ordering, ) -> Result { unsafe { ops::atomic_compare_exchange(self.v.get(), current, new, success, failure) } } /// Stores a value into the `Atomic` if the current value is the same as the /// `current` value. /// /// Unlike `compare_exchange`, this function is allowed to spuriously fail /// even when the comparison succeeds, which can result in more efficient /// code on some platforms. The return value is a result indicating whether /// the new value was written and containing the previous value. /// /// `compare_exchange` takes two `Ordering` arguments to describe the memory /// ordering of this operation. The first describes the required ordering if /// the operation succeeds while the second describes the required ordering /// when the operation fails. The failure ordering can't be `Release` or /// `AcqRel` and must be equivalent or weaker than the success ordering. /// success ordering. #[inline] pub fn compare_exchange_weak( &self, current: T, new: T, success: Ordering, failure: Ordering, ) -> Result { unsafe { ops::atomic_compare_exchange_weak(self.v.get(), current, new, success, failure) } } /// Fetches the value, and applies a function to it that returns an optional /// new value. Returns a `Result` of `Ok(previous_value)` if the function returned `Some(_)`, else /// `Err(previous_value)`. /// /// Note: This may call the function multiple times if the value has been changed from other threads in /// the meantime, as long as the function returns `Some(_)`, but the function will have been applied /// only once to the stored value. /// /// `fetch_update` takes two [`Ordering`] arguments to describe the memory ordering of this operation. /// The first describes the required ordering for when the operation finally succeeds while the second /// describes the required ordering for loads. These correspond to the success and failure orderings of /// [`compare_exchange`] respectively. /// /// Using [`Acquire`] as success ordering makes the store part /// of this operation [`Relaxed`], and using [`Release`] makes the final successful load /// [`Relaxed`]. The (failed) load ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`] /// and must be equivalent to or weaker than the success ordering. /// /// [`compare_exchange`]: #method.compare_exchange /// [`Ordering`]: enum.Ordering.html /// [`Relaxed`]: enum.Ordering.html#variant.Relaxed /// [`Release`]: enum.Ordering.html#variant.Release /// [`Acquire`]: enum.Ordering.html#variant.Acquire /// [`SeqCst`]: enum.Ordering.html#variant.SeqCst /// /// # Examples /// /// ```rust /// use atomic::{Atomic, Ordering}; /// /// let x = Atomic::new(7); /// assert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |_| None), Err(7)); /// assert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |x| Some(x + 1)), Ok(7)); /// assert_eq!(x.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |x| Some(x + 1)), Ok(8)); /// assert_eq!(x.load(Ordering::SeqCst), 9); /// ``` #[inline] pub fn fetch_update( &self, set_order: Ordering, fetch_order: Ordering, mut f: F, ) -> Result where F: FnMut(T) -> Option, { let mut prev = self.load(fetch_order); while let Some(next) = f(prev) { match self.compare_exchange_weak(prev, next, set_order, fetch_order) { x @ Ok(_) => return x, Err(next_prev) => prev = next_prev, } } Err(prev) } } impl Atomic { /// Logical "and" with a boolean value. /// /// Performs a logical "and" operation on the current value and the argument /// `val`, and sets the new value to the result. /// /// Returns the previous value. #[inline] pub fn fetch_and(&self, val: bool, order: Ordering) -> bool { unsafe { ops::atomic_and(self.v.get(), val, order) } } /// Logical "or" with a boolean value. /// /// Performs a logical "or" operation on the current value and the argument /// `val`, and sets the new value to the result. /// /// Returns the previous value. #[inline] pub fn fetch_or(&self, val: bool, order: Ordering) -> bool { unsafe { ops::atomic_or(self.v.get(), val, order) } } /// Logical "xor" with a boolean value. /// /// Performs a logical "xor" operation on the current value and the argument /// `val`, and sets the new value to the result. /// /// Returns the previous value. #[inline] pub fn fetch_xor(&self, val: bool, order: Ordering) -> bool { unsafe { ops::atomic_xor(self.v.get(), val, order) } } } macro_rules! atomic_ops_common { ($($t:ty)*) => ($( impl Atomic<$t> { /// Add to the current value, returning the previous value. #[inline] pub fn fetch_add(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_add(self.v.get(), val, order) } } /// Subtract from the current value, returning the previous value. #[inline] pub fn fetch_sub(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_sub(self.v.get(), val, order) } } /// Bitwise and with the current value, returning the previous value. #[inline] pub fn fetch_and(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_and(self.v.get(), val, order) } } /// Bitwise or with the current value, returning the previous value. #[inline] pub fn fetch_or(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_or(self.v.get(), val, order) } } /// Bitwise xor with the current value, returning the previous value. #[inline] pub fn fetch_xor(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_xor(self.v.get(), val, order) } } } )*); } macro_rules! atomic_ops_signed { ($($t:ty)*) => ( atomic_ops_common!{ $($t)* } $( impl Atomic<$t> { /// Minimum with the current value. #[inline] pub fn fetch_min(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_min(self.v.get(), val, order) } } /// Maximum with the current value. #[inline] pub fn fetch_max(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_max(self.v.get(), val, order) } } } )* ); } macro_rules! atomic_ops_unsigned { ($($t:ty)*) => ( atomic_ops_common!{ $($t)* } $( impl Atomic<$t> { /// Minimum with the current value. #[inline] pub fn fetch_min(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_umin(self.v.get(), val, order) } } /// Maximum with the current value. #[inline] pub fn fetch_max(&self, val: $t, order: Ordering) -> $t { unsafe { ops::atomic_umax(self.v.get(), val, order) } } } )* ); } atomic_ops_signed! { i8 i16 i32 i64 isize i128 } atomic_ops_unsigned! { u8 u16 u32 u64 usize u128 } #[cfg(test)] mod tests { use super::{Atomic, Ordering::*}; use core::mem; #[derive(Copy, Clone, Eq, PartialEq, Debug, Default)] struct Foo(u8, u8); #[derive(Copy, Clone, Eq, PartialEq, Debug, Default)] struct Bar(u64, u64); #[derive(Copy, Clone, Eq, PartialEq, Debug, Default)] struct Quux(u32); #[test] fn atomic_bool() { let a = Atomic::new(false); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u8),); assert_eq!(format!("{:?}", a), "Atomic(false)"); assert_eq!(a.load(SeqCst), false); a.store(true, SeqCst); assert_eq!(a.swap(false, SeqCst), true); assert_eq!(a.compare_exchange(true, false, SeqCst, SeqCst), Err(false)); assert_eq!(a.compare_exchange(false, true, SeqCst, SeqCst), Ok(false)); assert_eq!(a.fetch_and(false, SeqCst), true); assert_eq!(a.fetch_or(true, SeqCst), false); assert_eq!(a.fetch_xor(false, SeqCst), true); assert_eq!(a.load(SeqCst), true); } #[test] fn atomic_i8() { let a = Atomic::new(0i8); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u8)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); // Make sure overflows are handled correctly assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), -74); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_i16() { let a = Atomic::new(0i16); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u16)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 182); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_i32() { let a = Atomic::new(0i32); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u32)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 182); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_i64() { let a = Atomic::new(0i64); assert_eq!( Atomic::::is_lock_free(), cfg!(has_atomic_u64) && mem::align_of::() == 8 ); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 182); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_i128() { let a = Atomic::new(0i128); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u128)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 182); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_isize() { let a = Atomic::new(0isize); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(-56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 182); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(-25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_u8() { let a = Atomic::new(0u8); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u8)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_u16() { let a = Atomic::new(0u16); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u16)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_u32() { let a = Atomic::new(0u32); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u32)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_u64() { let a = Atomic::new(0u64); assert_eq!( Atomic::::is_lock_free(), cfg!(has_atomic_u64) && mem::align_of::() == 8 ); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_u128() { let a = Atomic::new(0u128); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u128)); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_usize() { let a = Atomic::new(0usize); assert_eq!(format!("{:?}", a), "Atomic(0)"); assert_eq!(a.load(SeqCst), 0); a.store(1, SeqCst); assert_eq!(a.swap(2, SeqCst), 1); assert_eq!(a.compare_exchange(5, 45, SeqCst, SeqCst), Err(2)); assert_eq!(a.compare_exchange(2, 3, SeqCst, SeqCst), Ok(2)); assert_eq!(a.fetch_add(123, SeqCst), 3); assert_eq!(a.fetch_sub(56, SeqCst), 126); assert_eq!(a.fetch_and(7, SeqCst), 70); assert_eq!(a.fetch_or(64, SeqCst), 6); assert_eq!(a.fetch_xor(1, SeqCst), 70); assert_eq!(a.fetch_min(30, SeqCst), 71); assert_eq!(a.fetch_max(25, SeqCst), 30); assert_eq!(a.load(SeqCst), 30); } #[test] fn atomic_foo() { let a = Atomic::default(); assert_eq!(Atomic::::is_lock_free(), false); assert_eq!(format!("{:?}", a), "Atomic(Foo(0, 0))"); assert_eq!(a.load(SeqCst), Foo(0, 0)); a.store(Foo(1, 1), SeqCst); assert_eq!(a.swap(Foo(2, 2), SeqCst), Foo(1, 1)); assert_eq!( a.compare_exchange(Foo(5, 5), Foo(45, 45), SeqCst, SeqCst), Err(Foo(2, 2)) ); assert_eq!( a.compare_exchange(Foo(2, 2), Foo(3, 3), SeqCst, SeqCst), Ok(Foo(2, 2)) ); assert_eq!(a.load(SeqCst), Foo(3, 3)); } #[test] fn atomic_bar() { let a = Atomic::default(); assert_eq!(Atomic::::is_lock_free(), false); assert_eq!(format!("{:?}", a), "Atomic(Bar(0, 0))"); assert_eq!(a.load(SeqCst), Bar(0, 0)); a.store(Bar(1, 1), SeqCst); assert_eq!(a.swap(Bar(2, 2), SeqCst), Bar(1, 1)); assert_eq!( a.compare_exchange(Bar(5, 5), Bar(45, 45), SeqCst, SeqCst), Err(Bar(2, 2)) ); assert_eq!( a.compare_exchange(Bar(2, 2), Bar(3, 3), SeqCst, SeqCst), Ok(Bar(2, 2)) ); assert_eq!(a.load(SeqCst), Bar(3, 3)); } #[test] fn atomic_quxx() { let a = Atomic::default(); assert_eq!(Atomic::::is_lock_free(), cfg!(has_atomic_u32)); assert_eq!(format!("{:?}", a), "Atomic(Quux(0))"); assert_eq!(a.load(SeqCst), Quux(0)); a.store(Quux(1), SeqCst); assert_eq!(a.swap(Quux(2), SeqCst), Quux(1)); assert_eq!( a.compare_exchange(Quux(5), Quux(45), SeqCst, SeqCst), Err(Quux(2)) ); assert_eq!( a.compare_exchange(Quux(2), Quux(3), SeqCst, SeqCst), Ok(Quux(2)) ); assert_eq!(a.load(SeqCst), Quux(3)); } } atomic-0.5.1/src/ops.rs000064400000000000000000000202140072674642500130700ustar 00000000000000// Copyright 2016 Amanieu d'Antras // // Licensed under the Apache License, Version 2.0, or the MIT license , at your option. This file may not be // copied, modified, or distributed except according to those terms. #[cfg(feature = "fallback")] use crate::fallback; use core::cmp; use core::mem; use core::num::Wrapping; use core::ops; use core::sync::atomic::Ordering; macro_rules! match_atomic { ($type:ident, $atomic:ident, $impl:expr, $fallback_impl:expr) => { match mem::size_of::<$type>() { #[cfg(has_atomic_u8)] 1 if mem::align_of::<$type>() >= 1 => { type $atomic = core::sync::atomic::AtomicU8; $impl } #[cfg(has_atomic_u16)] 2 if mem::align_of::<$type>() >= 2 => { type $atomic = core::sync::atomic::AtomicU16; $impl } #[cfg(has_atomic_u32)] 4 if mem::align_of::<$type>() >= 4 => { type $atomic = core::sync::atomic::AtomicU32; $impl } #[cfg(has_atomic_u64)] 8 if mem::align_of::<$type>() >= 8 => { type $atomic = core::sync::atomic::AtomicU64; $impl } #[cfg(has_atomic_u128)] 16 if mem::align_of::<$type>() >= 16 => { type $atomic = core::sync::atomic::AtomicU128; $impl } #[cfg(feature = "fallback")] _ => $fallback_impl, #[cfg(not(feature = "fallback"))] _ => panic!("Atomic operations for type `{}` are not available as the `fallback` feature of the `atomic` crate is disabled.", core::any::type_name::<$type>()), } }; } macro_rules! match_signed_atomic { ($type:ident, $atomic:ident, $impl:expr, $fallback_impl:expr) => { match mem::size_of::<$type>() { #[cfg(has_atomic_i8)] 1 if mem::align_of::<$type>() >= 1 => { type $atomic = core::sync::atomic::AtomicI8; $impl } #[cfg(has_atomic_i16)] 2 if mem::align_of::<$type>() >= 2 => { type $atomic = core::sync::atomic::AtomicI16; $impl } #[cfg(has_atomic_i32)] 4 if mem::align_of::<$type>() >= 4 => { type $atomic = core::sync::atomic::AtomicI32; $impl } #[cfg(has_atomic_i64)] 8 if mem::align_of::<$type>() >= 8 => { type $atomic = core::sync::atomic::AtomicI64; $impl } #[cfg(has_atomic_u128)] 16 if mem::align_of::<$type>() >= 16 => { type $atomic = core::sync::atomic::AtomicI128; $impl } #[cfg(feature = "fallback")] _ => $fallback_impl, #[cfg(not(feature = "fallback"))] _ => panic!("Atomic operations for type `{}` are not available as the `fallback` feature of the `atomic` crate is disabled.", core::any::type_name::<$type>()), } }; } #[inline] pub const fn atomic_is_lock_free() -> bool { let size = mem::size_of::(); let align = mem::align_of::(); (cfg!(has_atomic_u8) & (size == 1) & (align >= 1)) | (cfg!(has_atomic_u16) & (size == 2) & (align >= 2)) | (cfg!(has_atomic_u32) & (size == 4) & (align >= 4)) | (cfg!(has_atomic_u64) & (size == 8) & (align >= 8)) | (cfg!(has_atomic_u128) & (size == 16) & (align >= 16)) } #[inline] pub unsafe fn atomic_load(dst: *mut T, order: Ordering) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).load(order)), fallback::atomic_load(dst) ) } #[inline] pub unsafe fn atomic_store(dst: *mut T, val: T, order: Ordering) { match_atomic!( T, A, (*(dst as *const A)).store(mem::transmute_copy(&val), order), fallback::atomic_store(dst, val) ) } #[inline] pub unsafe fn atomic_swap(dst: *mut T, val: T, order: Ordering) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).swap(mem::transmute_copy(&val), order)), fallback::atomic_swap(dst, val) ) } #[inline] unsafe fn map_result(r: Result) -> Result { match r { Ok(x) => Ok(mem::transmute_copy(&x)), Err(x) => Err(mem::transmute_copy(&x)), } } #[inline] pub unsafe fn atomic_compare_exchange( dst: *mut T, current: T, new: T, success: Ordering, failure: Ordering, ) -> Result { match_atomic!( T, A, map_result((*(dst as *const A)).compare_exchange( mem::transmute_copy(¤t), mem::transmute_copy(&new), success, failure, )), fallback::atomic_compare_exchange(dst, current, new) ) } #[inline] pub unsafe fn atomic_compare_exchange_weak( dst: *mut T, current: T, new: T, success: Ordering, failure: Ordering, ) -> Result { match_atomic!( T, A, map_result((*(dst as *const A)).compare_exchange_weak( mem::transmute_copy(¤t), mem::transmute_copy(&new), success, failure, )), fallback::atomic_compare_exchange(dst, current, new) ) } #[inline] pub unsafe fn atomic_add(dst: *mut T, val: T, order: Ordering) -> T where Wrapping: ops::Add>, { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_add(mem::transmute_copy(&val), order),), fallback::atomic_add(dst, val) ) } #[inline] pub unsafe fn atomic_sub(dst: *mut T, val: T, order: Ordering) -> T where Wrapping: ops::Sub>, { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_sub(mem::transmute_copy(&val), order),), fallback::atomic_sub(dst, val) ) } #[inline] pub unsafe fn atomic_and>( dst: *mut T, val: T, order: Ordering, ) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_and(mem::transmute_copy(&val), order),), fallback::atomic_and(dst, val) ) } #[inline] pub unsafe fn atomic_or>( dst: *mut T, val: T, order: Ordering, ) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_or(mem::transmute_copy(&val), order),), fallback::atomic_or(dst, val) ) } #[inline] pub unsafe fn atomic_xor>( dst: *mut T, val: T, order: Ordering, ) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_xor(mem::transmute_copy(&val), order),), fallback::atomic_xor(dst, val) ) } #[inline] pub unsafe fn atomic_min(dst: *mut T, val: T, order: Ordering) -> T { match_signed_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_min(mem::transmute_copy(&val), order),), fallback::atomic_min(dst, val) ) } #[inline] pub unsafe fn atomic_max(dst: *mut T, val: T, order: Ordering) -> T { match_signed_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_max(mem::transmute_copy(&val), order),), fallback::atomic_max(dst, val) ) } #[inline] pub unsafe fn atomic_umin(dst: *mut T, val: T, order: Ordering) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_min(mem::transmute_copy(&val), order),), fallback::atomic_min(dst, val) ) } #[inline] pub unsafe fn atomic_umax(dst: *mut T, val: T, order: Ordering) -> T { match_atomic!( T, A, mem::transmute_copy(&(*(dst as *const A)).fetch_max(mem::transmute_copy(&val), order),), fallback::atomic_max(dst, val) ) }