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Diffstat (limited to 'third_party/rust/atomic/src/lib.rs')
| -rw-r--r-- | third_party/rust/atomic/src/lib.rs | 735 |
1 files changed, 735 insertions, 0 deletions
diff --git a/third_party/rust/atomic/src/lib.rs b/third_party/rust/atomic/src/lib.rs new file mode 100644 index 0000000000..d6b19a651b --- /dev/null +++ b/third_party/rust/atomic/src/lib.rs @@ -0,0 +1,735 @@ +// Copyright 2016 Amanieu d'Antras +// +// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or +// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or +// http://opensource.org/licenses/MIT>, at your option. This file may not be +// copied, modified, or distributed except according to those terms. + +//! Generic `Atomic<T>` 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<T>` 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 (only available on nightly). Atomic statics +//! are often used for lazy global initialization. + +#![warn(missing_docs)] +#![no_std] +#![cfg_attr( + feature = "nightly", feature(const_fn, cfg_target_has_atomic, atomic_min_max) +)] + +#[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; + +mod fallback; +mod ops; + +/// A generic atomic wrapper type which allows an object to be safely shared +/// between threads. +pub struct Atomic<T: Copy> { + v: UnsafeCell<T>, +} + +// Atomic<T> is only Sync if T is Send +unsafe impl<T: Copy + Send> Sync for Atomic<T> {} + +// Given that atomicity is guaranteed, Atomic<T> 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<T: Copy + RefUnwindSafe> RefUnwindSafe for Atomic<T> {} + +impl<T: Copy + Default> Default for Atomic<T> { + #[inline] + fn default() -> Self { + Self::new(Default::default()) + } +} + +impl<T: Copy + fmt::Debug> fmt::Debug for Atomic<T> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + f.debug_tuple("Atomic") + .field(&self.load(Ordering::SeqCst)) + .finish() + } +} + +impl<T: Copy> Atomic<T> { + /// Creates a new `Atomic`. + #[inline] + #[cfg(feature = "nightly")] + pub const fn new(v: T) -> Atomic<T> { + Atomic { + v: UnsafeCell::new(v), + } + } + + /// Creates a new `Atomic`. + #[inline] + #[cfg(not(feature = "nightly"))] + pub fn new(v: T) -> Atomic<T> { + 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] + #[cfg(feature = "nightly")] + pub const fn is_lock_free() -> bool { + ops::atomic_is_lock_free::<T>() + } + + /// 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] + #[cfg(not(feature = "nightly"))] + pub fn is_lock_free() -> bool { + ops::atomic_is_lock_free::<T>() + } + + /// 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 `Acquire` 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<T, T> { + 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 `Acquire` 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<T, T> { + unsafe { ops::atomic_compare_exchange_weak(self.v.get(), current, new, success, failure) } + } +} + +impl Atomic<bool> { + /// 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 core::mem; + use Atomic; + use Ordering::*; + + #[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::<bool>::is_lock_free(), cfg!(feature = "nightly")); + 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::<i8>::is_lock_free(), + cfg!(any( + target_pointer_width = "8", + all(feature = "nightly", target_has_atomic = "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); + // 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::<i16>::is_lock_free(), + cfg!(any( + target_pointer_width = "16", + all(feature = "nightly", target_has_atomic = "16") + )) + ); + 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::<i32>::is_lock_free(), + cfg!(any( + target_pointer_width = "32", + all(feature = "nightly", target_has_atomic = "32") + )) + ); + 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::<i64>::is_lock_free(), + cfg!(any( + target_pointer_width = "64", + all(feature = "nightly", target_has_atomic = "64") + )) && mem::align_of::<i64>() == 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::<i128>::is_lock_free(), + cfg!(any( + target_pointer_width = "128", + all(feature = "nightly", target_has_atomic = "128") + )) + ); + 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!(Atomic::<isize>::is_lock_free()); + 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::<u8>::is_lock_free(), + cfg!(any( + target_pointer_width = "8", + all(feature = "nightly", target_has_atomic = "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_u16() { + let a = Atomic::new(0u16); + assert_eq!( + Atomic::<u16>::is_lock_free(), + cfg!(any( + target_pointer_width = "16", + all(feature = "nightly", target_has_atomic = "16") + )) + ); + 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::<u32>::is_lock_free(), + cfg!(any( + target_pointer_width = "32", + all(feature = "nightly", target_has_atomic = "32") + )) + ); + 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::<u64>::is_lock_free(), + cfg!(any( + target_pointer_width = "64", + all(feature = "nightly", target_has_atomic = "64") + )) && mem::align_of::<u64>() == 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::<u128>::is_lock_free(), + cfg!(any( + target_pointer_width = "128", + all(feature = "nightly", target_has_atomic = "128") + )) + ); + 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!(Atomic::<usize>::is_lock_free()); + 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::<Foo>::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::<Bar>::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::<Quux>::is_lock_free(), + cfg!(any(feature = "nightly", target_pointer_width = "32")) + ); + 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)); + } +} |