1200 lines
38 KiB
Rust
1200 lines
38 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Atomic types
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//!
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//! Atomic types provide primitive shared-memory communication between
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//! threads, and are the building blocks of other concurrent
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//! types.
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//!
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//! This module defines atomic versions of a select number of primitive
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//! types, including `AtomicBool`, `AtomicIsize`, `AtomicUsize`, and `AtomicOption`.
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//! Atomic types present operations that, when used correctly, synchronize
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//! updates between threads.
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//!
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//! Each method takes an `Ordering` which represents the strength of
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//! the memory barrier for that operation. These orderings are the
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//! same as [LLVM atomic orderings][1].
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//!
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//! [1]: http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations
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//!
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//! Atomic variables are safe to share between threads (they implement `Sync`)
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//! but they do not themselves provide the mechanism for sharing. The most
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//! common way to share an atomic variable is to put it into an `Arc` (an
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//! atomically-reference-counted shared pointer).
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//!
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//! Most atomic types may be stored in static variables, initialized using
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//! the provided static initializers like `INIT_ATOMIC_BOOL`. Atomic statics
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//! are often used for lazy global initialization.
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//!
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//!
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//! # Examples
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//!
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//! A simple spinlock:
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//!
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//! ```
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//! use std::sync::Arc;
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//! use std::sync::atomic::{AtomicUsize, Ordering};
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//! use std::thread;
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//!
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//! fn main() {
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//! let spinlock = Arc::new(AtomicUsize::new(1));
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//!
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//! let spinlock_clone = spinlock.clone();
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//! thread::spawn(move|| {
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//! spinlock_clone.store(0, Ordering::SeqCst);
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//! });
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//!
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//! // Wait for the other task to release the lock
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//! while spinlock.load(Ordering::SeqCst) != 0 {}
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//! }
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//! ```
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//!
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//! Keep a global count of live tasks:
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//!
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//! ```
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//! use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
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//!
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//! static GLOBAL_TASK_COUNT: AtomicUsize = ATOMIC_USIZE_INIT;
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//!
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//! let old_task_count = GLOBAL_TASK_COUNT.fetch_add(1, Ordering::SeqCst);
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//! println!("live tasks: {}", old_task_count + 1);
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//! ```
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#![stable(feature = "rust1", since = "1.0.0")]
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use self::Ordering::*;
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use marker::Sync;
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use intrinsics;
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use cell::UnsafeCell;
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use marker::PhantomData;
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/// A boolean type which can be safely shared between threads.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct AtomicBool {
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v: UnsafeCell<usize>,
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}
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unsafe impl Sync for AtomicBool {}
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/// A signed integer type which can be safely shared between threads.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct AtomicIsize {
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v: UnsafeCell<isize>,
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}
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unsafe impl Sync for AtomicIsize {}
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/// An unsigned integer type which can be safely shared between threads.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct AtomicUsize {
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v: UnsafeCell<usize>,
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}
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unsafe impl Sync for AtomicUsize {}
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/// A raw pointer type which can be safely shared between threads.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub struct AtomicPtr<T> {
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p: UnsafeCell<usize>,
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_marker: PhantomData<*mut T>,
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}
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unsafe impl<T> Sync for AtomicPtr<T> {}
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/// Atomic memory orderings
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///
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/// Memory orderings limit the ways that both the compiler and CPU may reorder
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/// instructions around atomic operations. At its most restrictive,
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/// "sequentially consistent" atomics allow neither reads nor writes
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/// to be moved either before or after the atomic operation; on the other end
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/// "relaxed" atomics allow all reorderings.
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///
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/// Rust's memory orderings are [the same as
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/// C++'s](http://gcc.gnu.org/wiki/Atomic/GCCMM/AtomicSync).
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#[stable(feature = "rust1", since = "1.0.0")]
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#[derive(Copy)]
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pub enum Ordering {
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/// No ordering constraints, only atomic operations.
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#[stable(feature = "rust1", since = "1.0.0")]
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Relaxed,
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/// When coupled with a store, all previous writes become visible
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/// to another thread that performs a load with `Acquire` ordering
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/// on the same value.
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#[stable(feature = "rust1", since = "1.0.0")]
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Release,
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/// When coupled with a load, all subsequent loads will see data
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/// written before a store with `Release` ordering on the same value
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/// in another thread.
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#[stable(feature = "rust1", since = "1.0.0")]
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Acquire,
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/// When coupled with a load, uses `Acquire` ordering, and with a store
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/// `Release` ordering.
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#[stable(feature = "rust1", since = "1.0.0")]
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AcqRel,
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/// Like `AcqRel` with the additional guarantee that all threads see all
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/// sequentially consistent operations in the same order.
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#[stable(feature = "rust1", since = "1.0.0")]
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SeqCst,
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}
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/// An `AtomicBool` initialized to `false`.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub const ATOMIC_BOOL_INIT: AtomicBool =
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AtomicBool { v: UnsafeCell { value: 0 } };
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/// An `AtomicIsize` initialized to `0`.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub const ATOMIC_ISIZE_INIT: AtomicIsize =
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AtomicIsize { v: UnsafeCell { value: 0 } };
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/// An `AtomicUsize` initialized to `0`.
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#[stable(feature = "rust1", since = "1.0.0")]
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pub const ATOMIC_USIZE_INIT: AtomicUsize =
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AtomicUsize { v: UnsafeCell { value: 0, } };
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// NB: Needs to be -1 (0b11111111...) to make fetch_nand work correctly
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const UINT_TRUE: usize = -1;
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impl AtomicBool {
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/// Creates a new `AtomicBool`.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::AtomicBool;
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///
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/// let atomic_true = AtomicBool::new(true);
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/// let atomic_false = AtomicBool::new(false);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn new(v: bool) -> AtomicBool {
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let val = if v { UINT_TRUE } else { 0 };
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AtomicBool { v: UnsafeCell::new(val) }
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}
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/// Loads a value from the bool.
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///
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/// `load` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Panics
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///
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/// Panics if `order` is `Release` or `AcqRel`.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let some_bool = AtomicBool::new(true);
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///
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/// let value = some_bool.load(Ordering::Relaxed);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn load(&self, order: Ordering) -> bool {
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unsafe { atomic_load(self.v.get(), order) > 0 }
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}
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/// Stores a value into the bool.
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///
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/// `store` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let some_bool = AtomicBool::new(true);
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///
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/// some_bool.store(false, Ordering::Relaxed);
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/// ```
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///
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/// # Panics
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///
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/// Panics if `order` is `Acquire` or `AcqRel`.
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn store(&self, val: bool, order: Ordering) {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_store(self.v.get(), val, order); }
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}
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/// Stores a value into the bool, returning the old value.
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///
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/// `swap` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let some_bool = AtomicBool::new(true);
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///
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/// let value = some_bool.swap(false, Ordering::Relaxed);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn swap(&self, val: bool, order: Ordering) -> bool {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_swap(self.v.get(), val, order) > 0 }
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}
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/// Stores a value into the bool if the current value is the same as the expected value.
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///
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/// If the return value is equal to `old` then the value was updated.
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///
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/// `swap` also takes an `Ordering` argument which describes the memory ordering of this
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/// operation.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let some_bool = AtomicBool::new(true);
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///
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/// let value = some_bool.store(false, Ordering::Relaxed);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn compare_and_swap(&self, old: bool, new: bool, order: Ordering) -> bool {
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let old = if old { UINT_TRUE } else { 0 };
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let new = if new { UINT_TRUE } else { 0 };
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unsafe { atomic_compare_and_swap(self.v.get(), old, new, order) > 0 }
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}
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/// Logical "and" with a boolean value.
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///
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/// Performs a logical "and" operation on the current value and the argument `val`, and sets
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/// the new value to the result.
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///
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/// Returns the previous value.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_and(false, Ordering::SeqCst));
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_and(true, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(false);
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/// assert_eq!(false, foo.fetch_and(false, Ordering::SeqCst));
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn fetch_and(&self, val: bool, order: Ordering) -> bool {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_and(self.v.get(), val, order) > 0 }
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}
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/// Logical "nand" with a boolean value.
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///
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/// Performs a logical "nand" operation on the current value and the argument `val`, and sets
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/// the new value to the result.
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///
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/// Returns the previous value.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_nand(false, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_nand(true, Ordering::SeqCst));
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/// assert_eq!(0, foo.load(Ordering::SeqCst) as usize);
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(false);
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/// assert_eq!(false, foo.fetch_nand(false, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn fetch_nand(&self, val: bool, order: Ordering) -> bool {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_nand(self.v.get(), val, order) > 0 }
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}
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/// Logical "or" with a boolean value.
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///
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/// Performs a logical "or" operation on the current value and the argument `val`, and sets the
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/// new value to the result.
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///
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/// Returns the previous value.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_or(false, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_or(true, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(false);
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/// assert_eq!(false, foo.fetch_or(false, Ordering::SeqCst));
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn fetch_or(&self, val: bool, order: Ordering) -> bool {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_or(self.v.get(), val, order) > 0 }
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}
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/// Logical "xor" with a boolean value.
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///
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/// Performs a logical "xor" operation on the current value and the argument `val`, and sets
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/// the new value to the result.
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///
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/// Returns the previous value.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicBool, Ordering};
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_xor(false, Ordering::SeqCst));
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/// assert_eq!(true, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(true);
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/// assert_eq!(true, foo.fetch_xor(true, Ordering::SeqCst));
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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///
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/// let foo = AtomicBool::new(false);
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/// assert_eq!(false, foo.fetch_xor(false, Ordering::SeqCst));
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/// assert_eq!(false, foo.load(Ordering::SeqCst));
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn fetch_xor(&self, val: bool, order: Ordering) -> bool {
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let val = if val { UINT_TRUE } else { 0 };
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unsafe { atomic_xor(self.v.get(), val, order) > 0 }
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}
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}
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#[stable(feature = "rust1", since = "1.0.0")]
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impl AtomicIsize {
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/// Creates a new `AtomicIsize`.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::AtomicIsize;
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///
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/// let atomic_forty_two = AtomicIsize::new(42);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn new(v: isize) -> AtomicIsize {
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AtomicIsize {v: UnsafeCell::new(v)}
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}
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/// Loads a value from the isize.
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///
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/// `load` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Panics
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///
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/// Panics if `order` is `Release` or `AcqRel`.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicIsize, Ordering};
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///
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/// let some_isize = AtomicIsize::new(5);
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///
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/// let value = some_isize.load(Ordering::Relaxed);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn load(&self, order: Ordering) -> isize {
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unsafe { atomic_load(self.v.get(), order) }
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}
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/// Stores a value into the isize.
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///
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/// `store` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicIsize, Ordering};
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///
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/// let some_isize = AtomicIsize::new(5);
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///
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/// some_isize.store(10, Ordering::Relaxed);
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/// ```
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///
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/// # Panics
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///
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/// Panics if `order` is `Acquire` or `AcqRel`.
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn store(&self, val: isize, order: Ordering) {
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unsafe { atomic_store(self.v.get(), val, order); }
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}
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/// Stores a value into the isize, returning the old value.
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///
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/// `swap` takes an `Ordering` argument which describes the memory ordering of this operation.
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///
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/// # Examples
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///
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/// ```
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/// use std::sync::atomic::{AtomicIsize, Ordering};
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///
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/// let some_isize = AtomicIsize::new(5);
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///
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/// let value = some_isize.swap(10, Ordering::Relaxed);
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/// ```
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn swap(&self, val: isize, order: Ordering) -> isize {
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unsafe { atomic_swap(self.v.get(), val, order) }
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}
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/// Stores a value into the isize if the current value is the same as the expected value.
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|
///
|
|
/// If the return value is equal to `old` then the value was updated.
|
|
///
|
|
/// `compare_and_swap` also takes an `Ordering` argument which describes the memory ordering of
|
|
/// this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let some_isize = AtomicIsize::new(5);
|
|
///
|
|
/// let value = some_isize.compare_and_swap(5, 10, Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn compare_and_swap(&self, old: isize, new: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_compare_and_swap(self.v.get(), old, new, order) }
|
|
}
|
|
|
|
/// Add an isize to the current value, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let foo = AtomicIsize::new(0);
|
|
/// assert_eq!(0, foo.fetch_add(10, Ordering::SeqCst));
|
|
/// assert_eq!(10, foo.load(Ordering::SeqCst));
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_add(&self, val: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_add(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Subtract an isize from the current value, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let foo = AtomicIsize::new(0);
|
|
/// assert_eq!(0, foo.fetch_sub(10, Ordering::SeqCst));
|
|
/// assert_eq!(-10, foo.load(Ordering::SeqCst));
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_sub(&self, val: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_sub(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise and with the current isize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let foo = AtomicIsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_and(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b100001, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_and(&self, val: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_and(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise or with the current isize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let foo = AtomicIsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_or(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b111111, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_or(&self, val: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_or(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise xor with the current isize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicIsize, Ordering};
|
|
///
|
|
/// let foo = AtomicIsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_xor(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b011110, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_xor(&self, val: isize, order: Ordering) -> isize {
|
|
unsafe { atomic_xor(self.v.get(), val, order) }
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl AtomicUsize {
|
|
/// Creates a new `AtomicUsize`.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::AtomicUsize;
|
|
///
|
|
/// let atomic_forty_two = AtomicUsize::new(42);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn new(v: usize) -> AtomicUsize {
|
|
AtomicUsize { v: UnsafeCell::new(v) }
|
|
}
|
|
|
|
/// Loads a value from the usize.
|
|
///
|
|
/// `load` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `order` is `Release` or `AcqRel`.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let some_usize = AtomicUsize::new(5);
|
|
///
|
|
/// let value = some_usize.load(Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn load(&self, order: Ordering) -> usize {
|
|
unsafe { atomic_load(self.v.get(), order) }
|
|
}
|
|
|
|
/// Stores a value into the usize.
|
|
///
|
|
/// `store` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let some_usize = AtomicUsize::new(5);
|
|
///
|
|
/// some_usize.store(10, Ordering::Relaxed);
|
|
/// ```
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `order` is `Acquire` or `AcqRel`.
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn store(&self, val: usize, order: Ordering) {
|
|
unsafe { atomic_store(self.v.get(), val, order); }
|
|
}
|
|
|
|
/// Stores a value into the usize, returning the old value.
|
|
///
|
|
/// `swap` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let some_usize= AtomicUsize::new(5);
|
|
///
|
|
/// let value = some_usize.swap(10, Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn swap(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_swap(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Stores a value into the usize if the current value is the same as the expected value.
|
|
///
|
|
/// If the return value is equal to `old` then the value was updated.
|
|
///
|
|
/// `compare_and_swap` also takes an `Ordering` argument which describes the memory ordering of
|
|
/// this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let some_usize = AtomicUsize::new(5);
|
|
///
|
|
/// let value = some_usize.compare_and_swap(5, 10, Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn compare_and_swap(&self, old: usize, new: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_compare_and_swap(self.v.get(), old, new, order) }
|
|
}
|
|
|
|
/// Add to the current usize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let foo = AtomicUsize::new(0);
|
|
/// assert_eq!(0, foo.fetch_add(10, Ordering::SeqCst));
|
|
/// assert_eq!(10, foo.load(Ordering::SeqCst));
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_add(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_add(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Subtract from the current usize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let foo = AtomicUsize::new(10);
|
|
/// assert_eq!(10, foo.fetch_sub(10, Ordering::SeqCst));
|
|
/// assert_eq!(0, foo.load(Ordering::SeqCst));
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_sub(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_sub(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise and with the current usize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let foo = AtomicUsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_and(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b100001, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_and(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_and(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise or with the current usize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let foo = AtomicUsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_or(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b111111, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_or(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_or(self.v.get(), val, order) }
|
|
}
|
|
|
|
/// Bitwise xor with the current usize, returning the previous value.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicUsize, Ordering};
|
|
///
|
|
/// let foo = AtomicUsize::new(0b101101);
|
|
/// assert_eq!(0b101101, foo.fetch_xor(0b110011, Ordering::SeqCst));
|
|
/// assert_eq!(0b011110, foo.load(Ordering::SeqCst));
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fetch_xor(&self, val: usize, order: Ordering) -> usize {
|
|
unsafe { atomic_xor(self.v.get(), val, order) }
|
|
}
|
|
}
|
|
|
|
impl<T> AtomicPtr<T> {
|
|
/// Creates a new `AtomicPtr`.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::AtomicPtr;
|
|
///
|
|
/// let ptr = &mut 5;
|
|
/// let atomic_ptr = AtomicPtr::new(ptr);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn new(p: *mut T) -> AtomicPtr<T> {
|
|
AtomicPtr { p: UnsafeCell::new(p as usize),
|
|
_marker: PhantomData }
|
|
}
|
|
|
|
/// Loads a value from the pointer.
|
|
///
|
|
/// `load` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `order` is `Release` or `AcqRel`.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicPtr, Ordering};
|
|
///
|
|
/// let ptr = &mut 5;
|
|
/// let some_ptr = AtomicPtr::new(ptr);
|
|
///
|
|
/// let value = some_ptr.load(Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn load(&self, order: Ordering) -> *mut T {
|
|
unsafe {
|
|
atomic_load(self.p.get(), order) as *mut T
|
|
}
|
|
}
|
|
|
|
/// Stores a value into the pointer.
|
|
///
|
|
/// `store` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicPtr, Ordering};
|
|
///
|
|
/// let ptr = &mut 5;
|
|
/// let some_ptr = AtomicPtr::new(ptr);
|
|
///
|
|
/// let other_ptr = &mut 10;
|
|
///
|
|
/// some_ptr.store(other_ptr, Ordering::Relaxed);
|
|
/// ```
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `order` is `Acquire` or `AcqRel`.
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn store(&self, ptr: *mut T, order: Ordering) {
|
|
unsafe { atomic_store(self.p.get(), ptr as usize, order); }
|
|
}
|
|
|
|
/// Stores a value into the pointer, returning the old value.
|
|
///
|
|
/// `swap` takes an `Ordering` argument which describes the memory ordering of this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicPtr, Ordering};
|
|
///
|
|
/// let ptr = &mut 5;
|
|
/// let some_ptr = AtomicPtr::new(ptr);
|
|
///
|
|
/// let other_ptr = &mut 10;
|
|
///
|
|
/// let value = some_ptr.swap(other_ptr, Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn swap(&self, ptr: *mut T, order: Ordering) -> *mut T {
|
|
unsafe { atomic_swap(self.p.get(), ptr as usize, order) as *mut T }
|
|
}
|
|
|
|
/// Stores a value into the pointer if the current value is the same as the expected value.
|
|
///
|
|
/// If the return value is equal to `old` then the value was updated.
|
|
///
|
|
/// `compare_and_swap` also takes an `Ordering` argument which describes the memory ordering of
|
|
/// this operation.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::sync::atomic::{AtomicPtr, Ordering};
|
|
///
|
|
/// let ptr = &mut 5;
|
|
/// let some_ptr = AtomicPtr::new(ptr);
|
|
///
|
|
/// let other_ptr = &mut 10;
|
|
/// let another_ptr = &mut 10;
|
|
///
|
|
/// let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);
|
|
/// ```
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn compare_and_swap(&self, old: *mut T, new: *mut T, order: Ordering) -> *mut T {
|
|
unsafe {
|
|
atomic_compare_and_swap(self.p.get(), old as usize,
|
|
new as usize, order) as *mut T
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
unsafe fn atomic_store<T>(dst: *mut T, val: T, order:Ordering) {
|
|
match order {
|
|
Release => intrinsics::atomic_store_rel(dst, val),
|
|
Relaxed => intrinsics::atomic_store_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_store(dst, val),
|
|
Acquire => panic!("there is no such thing as an acquire store"),
|
|
AcqRel => panic!("there is no such thing as an acquire/release store"),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_load<T>(dst: *const T, order:Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_load_acq(dst),
|
|
Relaxed => intrinsics::atomic_load_relaxed(dst),
|
|
SeqCst => intrinsics::atomic_load(dst),
|
|
Release => panic!("there is no such thing as a release load"),
|
|
AcqRel => panic!("there is no such thing as an acquire/release load"),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_swap<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_xchg_acq(dst, val),
|
|
Release => intrinsics::atomic_xchg_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_xchg_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_xchg_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_xchg(dst, val)
|
|
}
|
|
}
|
|
|
|
/// Returns the old value (like __sync_fetch_and_add).
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_add<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_xadd_acq(dst, val),
|
|
Release => intrinsics::atomic_xadd_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_xadd_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_xadd_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_xadd(dst, val)
|
|
}
|
|
}
|
|
|
|
/// Returns the old value (like __sync_fetch_and_sub).
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_sub<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_xsub_acq(dst, val),
|
|
Release => intrinsics::atomic_xsub_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_xsub_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_xsub_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_xsub(dst, val)
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_compare_and_swap<T>(dst: *mut T, old:T, new:T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_cxchg_acq(dst, old, new),
|
|
Release => intrinsics::atomic_cxchg_rel(dst, old, new),
|
|
AcqRel => intrinsics::atomic_cxchg_acqrel(dst, old, new),
|
|
Relaxed => intrinsics::atomic_cxchg_relaxed(dst, old, new),
|
|
SeqCst => intrinsics::atomic_cxchg(dst, old, new),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_and<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_and_acq(dst, val),
|
|
Release => intrinsics::atomic_and_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_and_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_and_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_and(dst, val)
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_nand<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_nand_acq(dst, val),
|
|
Release => intrinsics::atomic_nand_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_nand_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_nand_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_nand(dst, val)
|
|
}
|
|
}
|
|
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_or<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_or_acq(dst, val),
|
|
Release => intrinsics::atomic_or_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_or_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_or_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_or(dst, val)
|
|
}
|
|
}
|
|
|
|
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
unsafe fn atomic_xor<T>(dst: *mut T, val: T, order: Ordering) -> T {
|
|
match order {
|
|
Acquire => intrinsics::atomic_xor_acq(dst, val),
|
|
Release => intrinsics::atomic_xor_rel(dst, val),
|
|
AcqRel => intrinsics::atomic_xor_acqrel(dst, val),
|
|
Relaxed => intrinsics::atomic_xor_relaxed(dst, val),
|
|
SeqCst => intrinsics::atomic_xor(dst, val)
|
|
}
|
|
}
|
|
|
|
|
|
/// An atomic fence.
|
|
///
|
|
/// A fence 'A' which has `Release` ordering semantics, synchronizes with a
|
|
/// fence 'B' with (at least) `Acquire` semantics, if and only if there exists
|
|
/// atomic operations X and Y, both operating on some atomic object 'M' such
|
|
/// that A is sequenced before X, Y is synchronized before B and Y observes
|
|
/// the change to M. This provides a happens-before dependence between A and B.
|
|
///
|
|
/// Atomic operations with `Release` or `Acquire` semantics can also synchronize
|
|
/// with a fence.
|
|
///
|
|
/// A fence which has `SeqCst` ordering, in addition to having both `Acquire`
|
|
/// and `Release` semantics, participates in the global program order of the
|
|
/// other `SeqCst` operations and/or fences.
|
|
///
|
|
/// Accepts `Acquire`, `Release`, `AcqRel` and `SeqCst` orderings.
|
|
///
|
|
/// # Panics
|
|
///
|
|
/// Panics if `order` is `Relaxed`.
|
|
#[inline]
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
pub fn fence(order: Ordering) {
|
|
unsafe {
|
|
match order {
|
|
Acquire => intrinsics::atomic_fence_acq(),
|
|
Release => intrinsics::atomic_fence_rel(),
|
|
AcqRel => intrinsics::atomic_fence_acqrel(),
|
|
SeqCst => intrinsics::atomic_fence(),
|
|
Relaxed => panic!("there is no such thing as a relaxed fence")
|
|
}
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "core")]
|
|
#[deprecated(since = "1.0.0",
|
|
reason = "renamed to AtomicIsize")]
|
|
#[allow(missing_docs)]
|
|
pub struct AtomicInt {
|
|
v: UnsafeCell<int>,
|
|
}
|
|
|
|
unsafe impl Sync for AtomicInt {}
|
|
|
|
#[unstable(feature = "core")]
|
|
#[deprecated(since = "1.0.0",
|
|
reason = "renamed to AtomicUsize")]
|
|
#[allow(missing_docs)]
|
|
pub struct AtomicUint {
|
|
v: UnsafeCell<uint>,
|
|
}
|
|
|
|
unsafe impl Sync for AtomicUint {}
|
|
|
|
#[unstable(feature = "core")]
|
|
#[deprecated(since = "1.0.0",
|
|
reason = "use ATOMIC_ISIZE_INIT instead")]
|
|
#[allow(missing_docs, deprecated)]
|
|
pub const ATOMIC_INT_INIT: AtomicInt =
|
|
AtomicInt { v: UnsafeCell { value: 0 } };
|
|
#[unstable(feature = "core")]
|
|
#[deprecated(since = "1.0.0",
|
|
reason = "use ATOMIC_USIZE_INIT instead")]
|
|
#[allow(missing_docs, deprecated)]
|
|
pub const ATOMIC_UINT_INIT: AtomicUint =
|
|
AtomicUint { v: UnsafeCell { value: 0, } };
|
|
|
|
#[allow(missing_docs, deprecated)]
|
|
impl AtomicInt {
|
|
#[inline]
|
|
pub fn new(v: int) -> AtomicInt {
|
|
AtomicInt {v: UnsafeCell::new(v)}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn load(&self, order: Ordering) -> int {
|
|
unsafe { atomic_load(self.v.get(), order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn store(&self, val: int, order: Ordering) {
|
|
unsafe { atomic_store(self.v.get(), val, order); }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn swap(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_swap(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn compare_and_swap(&self, old: int, new: int, order: Ordering) -> int {
|
|
unsafe { atomic_compare_and_swap(self.v.get(), old, new, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_add(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_add(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_sub(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_sub(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_and(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_and(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_or(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_or(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_xor(&self, val: int, order: Ordering) -> int {
|
|
unsafe { atomic_xor(self.v.get(), val, order) }
|
|
}
|
|
}
|
|
|
|
#[allow(missing_docs, deprecated)]
|
|
impl AtomicUint {
|
|
#[inline]
|
|
pub fn new(v: uint) -> AtomicUint {
|
|
AtomicUint { v: UnsafeCell::new(v) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn load(&self, order: Ordering) -> uint {
|
|
unsafe { atomic_load(self.v.get(), order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn store(&self, val: uint, order: Ordering) {
|
|
unsafe { atomic_store(self.v.get(), val, order); }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn swap(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_swap(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn compare_and_swap(&self, old: uint, new: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_compare_and_swap(self.v.get(), old, new, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_add(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_add(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_sub(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_sub(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_and(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_and(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_or(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_or(self.v.get(), val, order) }
|
|
}
|
|
|
|
#[inline]
|
|
pub fn fetch_xor(&self, val: uint, order: Ordering) -> uint {
|
|
unsafe { atomic_xor(self.v.get(), val, order) }
|
|
}
|
|
}
|