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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Atomic types</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Atomic types provide primitive shared-memory communication between</span>
<span class="doccomment">//! threads, and are the building blocks of other concurrent</span>
<span class="doccomment">//! types.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module defines atomic versions of a select number of primitive</span>
<span class="doccomment">//! types, including [`AtomicBool`], [`AtomicIsize`], and [`AtomicUsize`].</span>
<span class="doccomment">//! Atomic types present operations that, when used correctly, synchronize</span>
<span class="doccomment">//! updates between threads.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`AtomicBool`]: struct.AtomicBool.html</span>
<span class="doccomment">//! [`AtomicIsize`]: struct.AtomicIsize.html</span>
<span class="doccomment">//! [`AtomicUsize`]: struct.AtomicUsize.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Each method takes an [`Ordering`] which represents the strength of</span>
<span class="doccomment">//! the memory barrier for that operation. These orderings are the</span>
<span class="doccomment">//! same as [LLVM atomic orderings][1]. For more information see the [nomicon][2].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [1]: http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations</span>
<span class="doccomment">//! [2]: ../../../nomicon/atomics.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Atomic variables are safe to share between threads (they implement [`Sync`])</span>
<span class="doccomment">//! but they do not themselves provide the mechanism for sharing and follow the</span>
<span class="doccomment">//! [threading model](../../../std/thread/index.html#the-threading-model) of rust.</span>
<span class="doccomment">//! The most common way to share an atomic variable is to put it into an [`Arc`][arc] (an</span>
<span class="doccomment">//! atomically-reference-counted shared pointer).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Sync`]: ../../marker/trait.Sync.html</span>
<span class="doccomment">//! [arc]: ../../../std/sync/struct.Arc.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Most atomic types may be stored in static variables, initialized using</span>
<span class="doccomment">//! the provided static initializers like [`ATOMIC_BOOL_INIT`]. Atomic statics</span>
<span class="doccomment">//! are often used for lazy global initialization.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`ATOMIC_BOOL_INIT`]: constant.ATOMIC_BOOL_INIT.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A simple spinlock:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::sync::Arc;</span>
<span class="doccomment">//! use std::sync::atomic::{AtomicUsize, Ordering};</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! let spinlock = Arc::new(AtomicUsize::new(1));</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let spinlock_clone = spinlock.clone();</span>
<span class="doccomment">//! let thread = thread::spawn(move|| {</span>
<span class="doccomment">//! spinlock_clone.store(0, Ordering::SeqCst);</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Wait for the other thread to release the lock</span>
<span class="doccomment">//! while spinlock.load(Ordering::SeqCst) != 0 {}</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! if let Err(panic) = thread.join() {</span>
<span class="doccomment">//! println!("Thread had an error: {:?}", panic);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Keep a global count of live threads:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! static GLOBAL_THREAD_COUNT: AtomicUsize = ATOMIC_USIZE_INIT;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let old_thread_count = GLOBAL_THREAD_COUNT.fetch_add(1, Ordering::SeqCst);</span>
<span class="doccomment">//! println!("live threads: {}", old_thread_count + 1);</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>), <span class="ident">allow</span>(<span class="ident">dead_code</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>), <span class="ident">allow</span>(<span class="ident">unused_imports</span>))]</span>
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">Ordering</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">intrinsics</span>;
<span class="kw">use</span> <span class="ident">cell</span>::<span class="ident">UnsafeCell</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="doccomment">/// Save power or switch hyperthreads in a busy-wait spin-loop.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is deliberately more primitive than</span>
<span class="doccomment">/// `std::thread::yield_now` and does not directly yield to the</span>
<span class="doccomment">/// system's scheduler. In some cases it might be useful to use a</span>
<span class="doccomment">/// combination of both functions. Careful benchmarking is advised.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// On some platforms this function may not do anything at all.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hint_core_should_pause"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41196"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hint_core_should_pause</span>()
{
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>))]</span>
<span class="kw">unsafe</span> {
<span class="macro">asm</span><span class="macro">!</span>(<span class="string">"pause"</span> ::: <span class="string">"memory"</span> : <span class="string">"volatile"</span>);
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"aarch64"</span>)]</span>
<span class="kw">unsafe</span> {
<span class="macro">asm</span><span class="macro">!</span>(<span class="string">"yield"</span> ::: <span class="string">"memory"</span> : <span class="string">"volatile"</span>);
}
}
<span class="doccomment">/// A boolean type which can be safely shared between threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type has the same in-memory representation as a `bool`.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AtomicBool</span> {
<span class="ident">v</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">AtomicBool</span> {
<span class="doccomment">/// Creates an `AtomicBool` initialized to `false`.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="self">Self</span>::<span class="ident">new</span>(<span class="bool-val">false</span>)
}
}
<span class="comment">// Send is implicitly implemented for AtomicBool.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">AtomicBool</span> {}
<span class="doccomment">/// A raw pointer type which can be safely shared between threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type has the same in-memory representation as a `*mut T`.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">p</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a null `AtomicPtr<T>`.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">AtomicPtr</span>::<span class="ident">new</span>(::<span class="ident">ptr</span>::<span class="ident">null_mut</span>())
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="doccomment">/// Atomic memory orderings</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Memory orderings limit the ways that both the compiler and CPU may reorder</span>
<span class="doccomment">/// instructions around atomic operations. At its most restrictive,</span>
<span class="doccomment">/// "sequentially consistent" atomics allow neither reads nor writes</span>
<span class="doccomment">/// to be moved either before or after the atomic operation; on the other end</span>
<span class="doccomment">/// "relaxed" atomics allow all reorderings.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Rust's memory orderings are [the same as</span>
<span class="doccomment">/// LLVM's](http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information see the [nomicon].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [nomicon]: ../../../nomicon/atomics.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Ordering</span> {
<span class="doccomment">/// No ordering constraints, only atomic operations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Corresponds to LLVM's [`Monotonic`] ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Monotonic`]: http://llvm.org/docs/Atomics.html#monotonic</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Relaxed</span>,
<span class="doccomment">/// When coupled with a store, all previous writes become visible</span>
<span class="doccomment">/// to the other threads that perform a load with [`Acquire`] ordering</span>
<span class="doccomment">/// on the same value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Acquire`]: http://llvm.org/docs/Atomics.html#acquire</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Release</span>,
<span class="doccomment">/// When coupled with a load, all subsequent loads will see data</span>
<span class="doccomment">/// written before a store with [`Release`] ordering on the same value</span>
<span class="doccomment">/// in other threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Release`]: http://llvm.org/docs/Atomics.html#release</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Acquire</span>,
<span class="doccomment">/// When coupled with a load, uses [`Acquire`] ordering, and with a store</span>
<span class="doccomment">/// [`Release`] ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Acquire`]: http://llvm.org/docs/Atomics.html#acquire</span>
<span class="doccomment">/// [`Release`]: http://llvm.org/docs/Atomics.html#release</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">AcqRel</span>,
<span class="doccomment">/// Like `AcqRel` with the additional guarantee that all threads see all</span>
<span class="doccomment">/// sequentially consistent operations in the same order.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">SeqCst</span>,
<span class="comment">// Prevent exhaustive matching to allow for future extension</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"future_atomic_orderings"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="ident">__Nonexhaustive</span>,
}
<span class="doccomment">/// An [`AtomicBool`] initialized to `false`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`AtomicBool`]: struct.AtomicBool.html</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">ATOMIC_BOOL_INIT</span>: <span class="ident">AtomicBool</span> <span class="op">=</span> <span class="ident">AtomicBool</span>::<span class="ident">new</span>(<span class="bool-val">false</span>);
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="kw">impl</span> <span class="ident">AtomicBool</span> {
<span class="doccomment">/// Creates a new `AtomicBool`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicBool;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let atomic_true = AtomicBool::new(true);</span>
<span class="doccomment">/// let atomic_false = AtomicBool::new(false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">v</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">AtomicBool</span> {
<span class="ident">AtomicBool</span> { <span class="ident">v</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">v</span> <span class="kw">as</span> <span class="ident">u8</span>) }
}
<span class="doccomment">/// Returns a mutable reference to the underlying `bool`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because the mutable reference guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut some_bool = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(*some_bool.get_mut(), true);</span>
<span class="doccomment">/// *some_bool.get_mut() = false;</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::SeqCst), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">bool</span>) }
}
<span class="doccomment">/// Consumes the atomic and returns the contained value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because passing `self` by value guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicBool;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(some_bool.into_inner(), true);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">into_inner</span>() <span class="op">!=</span> <span class="number">0</span> }
}
<span class="doccomment">/// Loads a value from the bool.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `load` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Release`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), true);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_load</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">order</span>) <span class="op">!=</span> <span class="number">0</span> }
}
<span class="doccomment">/// Stores a value into the bool.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `store` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// some_bool.store(false, Ordering::Relaxed);</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Acquire`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Acquire`]: enum.Ordering.html#variant.Acquire</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">unsafe</span> {
<span class="ident">atomic_store</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">order</span>);
}
}
<span class="doccomment">/// Stores a value into the bool, returning the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `swap` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.swap(false, Ordering::Relaxed), true);</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_swap</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">order</span>) <span class="op">!=</span> <span class="number">0</span> }
}
<span class="doccomment">/// Stores a value into the `bool` if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is always the previous value. If it is equal to `current`, then the value</span>
<span class="doccomment">/// was updated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_and_swap` also takes an [`Ordering`] argument which describes the memory</span>
<span class="doccomment">/// ordering of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.compare_and_swap(true, false, Ordering::Relaxed), true);</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.compare_and_swap(true, true, Ordering::Relaxed), false);</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">current</span>: <span class="ident">bool</span>, <span class="ident">new</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">compare_exchange</span>(<span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">order</span>, <span class="ident">strongest_failure_ordering</span>(<span class="ident">order</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
}
}
<span class="doccomment">/// Stores a value into the `bool` if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a result indicating whether the new value was written and containing</span>
<span class="doccomment">/// the previous value. On success this value is guaranteed to be equal to `current`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if the</span>
<span class="doccomment">/// operation succeeds while the second describes the required ordering when the</span>
<span class="doccomment">/// operation fails. The failure ordering can't be [`Release`] or [`AcqRel`] and must</span>
<span class="doccomment">/// be equivalent or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_bool = AtomicBool::new(true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.compare_exchange(true,</span>
<span class="doccomment">/// false,</span>
<span class="doccomment">/// Ordering::Acquire,</span>
<span class="doccomment">/// Ordering::Relaxed),</span>
<span class="doccomment">/// Ok(true));</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_bool.compare_exchange(true, true,</span>
<span class="doccomment">/// Ordering::SeqCst,</span>
<span class="doccomment">/// Ordering::Acquire),</span>
<span class="doccomment">/// Err(false));</span>
<span class="doccomment">/// assert_eq!(some_bool.load(Ordering::Relaxed), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">bool</span>,
<span class="ident">new</span>: <span class="ident">bool</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">bool</span>, <span class="ident">bool</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw">unsafe</span> {
<span class="ident">atomic_compare_exchange</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">current</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">new</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">success</span>, <span class="ident">failure</span>)
} {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">x</span> <span class="op">!=</span> <span class="number">0</span>),
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">x</span> <span class="op">!=</span> <span class="number">0</span>),
}
}
<span class="doccomment">/// Stores a value into the `bool` if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike [`compare_exchange`], this function is allowed to spuriously fail even when the</span>
<span class="doccomment">/// comparison succeeds, which can result in more efficient code on some platforms. The</span>
<span class="doccomment">/// return value is a result indicating whether the new value was written and containing the</span>
<span class="doccomment">/// previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange_weak` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if the operation</span>
<span class="doccomment">/// succeeds while the second describes the required ordering when the operation fails. The</span>
<span class="doccomment">/// failure ordering can't be [`Release`] or [`AcqRel`] and must be equivalent or</span>
<span class="doccomment">/// weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`compare_exchange`]: #method.compare_exchange</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let val = AtomicBool::new(false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let new = true;</span>
<span class="doccomment">/// let mut old = val.load(Ordering::Relaxed);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match val.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {</span>
<span class="doccomment">/// Ok(_) => break,</span>
<span class="doccomment">/// Err(x) => old = x,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange_weak</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="ident">bool</span>,
<span class="ident">new</span>: <span class="ident">bool</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">bool</span>, <span class="ident">bool</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw">unsafe</span> {
<span class="ident">atomic_compare_exchange_weak</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">current</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">new</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">success</span>, <span class="ident">failure</span>)
} {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">x</span> <span class="op">!=</span> <span class="number">0</span>),
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">x</span> <span class="op">!=</span> <span class="number">0</span>),
}
}
<span class="doccomment">/// Logical "and" with a boolean value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a logical "and" operation on the current value and the argument `val`, and sets</span>
<span class="doccomment">/// the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_and(false, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_and(true, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(false);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_and(false, Ordering::SeqCst), false);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_and</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_and</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">order</span>) <span class="op">!=</span> <span class="number">0</span> }
}
<span class="doccomment">/// Logical "nand" with a boolean value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a logical "nand" operation on the current value and the argument `val`, and sets</span>
<span class="doccomment">/// the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_nand(false, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_nand(true, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst) as usize, 0);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(false);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_nand(false, Ordering::SeqCst), false);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_nand</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="comment">// We can't use atomic_nand here because it can result in a bool with</span>
<span class="comment">// an invalid value. This happens because the atomic operation is done</span>
<span class="comment">// with an 8-bit integer internally, which would set the upper 7 bits.</span>
<span class="comment">// So we just use fetch_xor or swap instead.</span>
<span class="kw">if</span> <span class="ident">val</span> {
<span class="comment">// !(x & true) == !x</span>
<span class="comment">// We must invert the bool.</span>
<span class="self">self</span>.<span class="ident">fetch_xor</span>(<span class="bool-val">true</span>, <span class="ident">order</span>)
} <span class="kw">else</span> {
<span class="comment">// !(x & false) == true</span>
<span class="comment">// We must set the bool to true.</span>
<span class="self">self</span>.<span class="ident">swap</span>(<span class="bool-val">true</span>, <span class="ident">order</span>)
}
}
<span class="doccomment">/// Logical "or" with a boolean value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a logical "or" operation on the current value and the argument `val`, and sets the</span>
<span class="doccomment">/// new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_or(false, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_or(true, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(false);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_or(false, Ordering::SeqCst), false);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_or</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_or</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">order</span>) <span class="op">!=</span> <span class="number">0</span> }
}
<span class="doccomment">/// Logical "xor" with a boolean value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a logical "xor" operation on the current value and the argument `val`, and sets</span>
<span class="doccomment">/// the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicBool, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_xor(false, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), true);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(true);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_xor(true, Ordering::SeqCst), true);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicBool::new(false);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_xor(false, Ordering::SeqCst), false);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_xor</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">bool</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_xor</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">order</span>) <span class="op">!=</span> <span class="number">0</span> }
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `AtomicPtr`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicPtr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let atomic_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">AtomicPtr</span> { <span class="ident">p</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">p</span>) }
}
<span class="doccomment">/// Returns a mutable reference to the underlying pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because the mutable reference guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut atomic_ptr = AtomicPtr::new(&mut 10);</span>
<span class="doccomment">/// *atomic_ptr.get_mut() = &mut 5;</span>
<span class="doccomment">/// assert_eq!(unsafe { *atomic_ptr.load(Ordering::SeqCst) }, 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() }
}
<span class="doccomment">/// Consumes the atomic and returns the contained value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because passing `self` by value guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicPtr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let atomic_ptr = AtomicPtr::new(&mut 5);</span>
<span class="doccomment">/// assert_eq!(unsafe { *atomic_ptr.into_inner() }, 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">p</span>.<span class="ident">into_inner</span>() }
}
<span class="doccomment">/// Loads a value from the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `load` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Release`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let value = some_ptr.load(Ordering::Relaxed);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_load</span>(<span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">order</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> }
}
<span class="doccomment">/// Stores a value into the pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `store` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let other_ptr = &mut 10;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// some_ptr.store(other_ptr, Ordering::Relaxed);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Acquire`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Acquire`]: enum.Ordering.html#variant.Acquire</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">unsafe</span> {
<span class="ident">atomic_store</span>(<span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">order</span>);
}
}
<span class="doccomment">/// Stores a value into the pointer, returning the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `swap` takes an [`Ordering`] argument which describes the memory ordering</span>
<span class="doccomment">/// of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let other_ptr = &mut 10;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let value = some_ptr.swap(other_ptr, Ordering::Relaxed);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_swap</span>(<span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">order</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> }
}
<span class="doccomment">/// Stores a value into the pointer if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is always the previous value. If it is equal to `current`, then the value</span>
<span class="doccomment">/// was updated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_and_swap` also takes an [`Ordering`] argument which describes the memory</span>
<span class="doccomment">/// ordering of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let other_ptr = &mut 10;</span>
<span class="doccomment">/// let another_ptr = &mut 10;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">current</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">new</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">compare_exchange</span>(<span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">order</span>, <span class="ident">strongest_failure_ordering</span>(<span class="ident">order</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
}
}
<span class="doccomment">/// Stores a value into the pointer if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a result indicating whether the new value was written and containing</span>
<span class="doccomment">/// the previous value. On success this value is guaranteed to be equal to `current`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if</span>
<span class="doccomment">/// the operation succeeds while the second describes the required ordering when</span>
<span class="doccomment">/// the operation fails. The failure ordering can't be [`Release`] or [`AcqRel`]</span>
<span class="doccomment">/// and must be equivalent or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = &mut 5;</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(ptr);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let other_ptr = &mut 10;</span>
<span class="doccomment">/// let another_ptr = &mut 10;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let value = some_ptr.compare_exchange(other_ptr, another_ptr,</span>
<span class="doccomment">/// Ordering::SeqCst, Ordering::Relaxed);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">new</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">atomic_compare_exchange</span>(<span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>,
<span class="ident">current</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">new</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">success</span>,
<span class="ident">failure</span>);
<span class="kw">match</span> <span class="ident">res</span> {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>),
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>),
}
}
}
<span class="doccomment">/// Stores a value into the pointer if the current value is the same as the `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike [`compare_exchange`], this function is allowed to spuriously fail even when the</span>
<span class="doccomment">/// comparison succeeds, which can result in more efficient code on some platforms. The</span>
<span class="doccomment">/// return value is a result indicating whether the new value was written and containing the</span>
<span class="doccomment">/// previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange_weak` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if the operation</span>
<span class="doccomment">/// succeeds while the second describes the required ordering when the operation fails. The</span>
<span class="doccomment">/// failure ordering can't be [`Release`] or [`AcqRel`] and must be equivalent or</span>
<span class="doccomment">/// weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`compare_exchange`]: #method.compare_exchange</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicPtr, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_ptr = AtomicPtr::new(&mut 5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let new = &mut 10;</span>
<span class="doccomment">/// let mut old = some_ptr.load(Ordering::Relaxed);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// match some_ptr.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {</span>
<span class="doccomment">/// Ok(_) => break,</span>
<span class="doccomment">/// Err(x) => old = x,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange_weak</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">new</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">atomic_compare_exchange_weak</span>(<span class="self">self</span>.<span class="ident">p</span>.<span class="ident">get</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>,
<span class="ident">current</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">new</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="ident">success</span>,
<span class="ident">failure</span>);
<span class="kw">match</span> <span class="ident">res</span> {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>),
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>),
}
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">atomic_int</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>:<span class="ident">meta</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_cxchg</span>:<span class="ident">meta</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_debug</span>:<span class="ident">meta</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_access</span>:<span class="ident">meta</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_init</span>:<span class="ident">ident</span>) <span class="op">=></span> {
<span class="doccomment">/// An integer type which can be safely shared between threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type has the same in-memory representation as the underlying integer type.</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {
<span class="ident">v</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span><span class="op">></span>,
}
<span class="doccomment">/// An atomic integer initialized to `0`.</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_init</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span>::<span class="ident">new</span>(<span class="number">0</span>);
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">Default</span>::<span class="ident">default</span>())
}
}
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_debug</span>]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span>))
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>))
.<span class="ident">finish</span>()
}
}
<span class="comment">// Send is implicitly implemented.</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {}
<span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {
<span class="doccomment">/// Creates a new atomic integer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicIsize;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let atomic_forty_two = AtomicIsize::new(42);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">v</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">atomic_type</span> {<span class="ident">v</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">v</span>)}
}
<span class="doccomment">/// Returns a mutable reference to the underlying integer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because the mutable reference guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut some_isize = AtomicIsize::new(10);</span>
<span class="doccomment">/// assert_eq!(*some_isize.get_mut(), 10);</span>
<span class="doccomment">/// *some_isize.get_mut() = 5;</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::SeqCst), 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_access</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>() }
}
<span class="doccomment">/// Consumes the atomic and returns the contained value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is safe because passing `self` by value guarantees that no other threads are</span>
<span class="doccomment">/// concurrently accessing the atomic data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicIsize;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">/// assert_eq!(some_isize.into_inner(), 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_access</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">into_inner</span>() }
}
<span class="doccomment">/// Loads a value from the atomic integer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `load` takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Release`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_load</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">order</span>) }
}
<span class="doccomment">/// Stores a value into the atomic integer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `store` takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// some_isize.store(10, Ordering::Relaxed);</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 10);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Acquire`] or [`AcqRel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Acquire`]: enum.Ordering.html#variant.Acquire</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">unsafe</span> { <span class="ident">atomic_store</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>); }
}
<span class="doccomment">/// Stores a value into the atomic integer, returning the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `swap` takes an [`Ordering`] argument which describes the memory ordering of this</span>
<span class="doccomment">/// operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.swap(10, Ordering::Relaxed), 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_swap</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
<span class="doccomment">/// Stores a value into the atomic integer if the current value is the same as the</span>
<span class="doccomment">/// `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is always the previous value. If it is equal to `current`, then the</span>
<span class="doccomment">/// value was updated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_and_swap` also takes an [`Ordering`] argument which describes the memory</span>
<span class="doccomment">/// ordering of this operation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.compare_and_swap(5, 10, Ordering::Relaxed), 5);</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.compare_and_swap(6, 12, Ordering::Relaxed), 10);</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_swap</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">new</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">compare_exchange</span>(<span class="ident">current</span>,
<span class="ident">new</span>,
<span class="ident">order</span>,
<span class="ident">strongest_failure_ordering</span>(<span class="ident">order</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
<span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
}
}
<span class="doccomment">/// Stores a value into the atomic integer if the current value is the same as the</span>
<span class="doccomment">/// `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The return value is a result indicating whether the new value was written and</span>
<span class="doccomment">/// containing the previous value. On success this value is guaranteed to be equal to</span>
<span class="doccomment">/// `current`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if</span>
<span class="doccomment">/// the operation succeeds while the second describes the required ordering when</span>
<span class="doccomment">/// the operation fails. The failure ordering can't be [`Release`] or [`AcqRel`] and</span>
<span class="doccomment">/// must be equivalent or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let some_isize = AtomicIsize::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.compare_exchange(5, 10,</span>
<span class="doccomment">/// Ordering::Acquire,</span>
<span class="doccomment">/// Ordering::Relaxed),</span>
<span class="doccomment">/// Ok(5));</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(some_isize.compare_exchange(6, 12,</span>
<span class="doccomment">/// Ordering::SeqCst,</span>
<span class="doccomment">/// Ordering::Acquire),</span>
<span class="doccomment">/// Err(10));</span>
<span class="doccomment">/// assert_eq!(some_isize.load(Ordering::Relaxed), 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_cxchg</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">new</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span><span class="op">></span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_compare_exchange</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">success</span>, <span class="ident">failure</span>) }
}
<span class="doccomment">/// Stores a value into the atomic integer if the current value is the same as the</span>
<span class="doccomment">/// `current` value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike [`compare_exchange`], this function is allowed to spuriously fail even</span>
<span class="doccomment">/// when the comparison succeeds, which can result in more efficient code on some</span>
<span class="doccomment">/// platforms. The return value is a result indicating whether the new value was</span>
<span class="doccomment">/// written and containing the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compare_exchange_weak` takes two [`Ordering`] arguments to describe the memory</span>
<span class="doccomment">/// ordering of this operation. The first describes the required ordering if the</span>
<span class="doccomment">/// operation succeeds while the second describes the required ordering when the</span>
<span class="doccomment">/// operation fails. The failure ordering can't be [`Release`] or [`AcqRel`] and</span>
<span class="doccomment">/// must be equivalent or weaker than the success ordering.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`compare_exchange`]: #method.compare_exchange</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let val = AtomicIsize::new(4);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut old = val.load(Ordering::Relaxed);</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// let new = old * 2;</span>
<span class="doccomment">/// match val.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {</span>
<span class="doccomment">/// Ok(_) => break,</span>
<span class="doccomment">/// Err(x) => old = x,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable_cxchg</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_exchange_weak</span>(<span class="kw-2">&</span><span class="self">self</span>,
<span class="ident">current</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">new</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="ident">atomic_compare_exchange_weak</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">current</span>, <span class="ident">new</span>, <span class="ident">success</span>, <span class="ident">failure</span>)
}
}
<span class="doccomment">/// Adds to the current value, returning the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation wraps around on overflow.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicIsize::new(0);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_add(10, Ordering::SeqCst), 0);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_add</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_add</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
<span class="doccomment">/// Subtracts from the current value, returning the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation wraps around on overflow.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicIsize::new(0);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 0);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), -10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_sub</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_sub</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
<span class="doccomment">/// Bitwise "and" with the current value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "and" operation on the current value and the argument `val`, and</span>
<span class="doccomment">/// sets the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicIsize::new(0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), 0b100001);</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_and</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_and</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
<span class="doccomment">/// Bitwise "or" with the current value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "or" operation on the current value and the argument `val`, and</span>
<span class="doccomment">/// sets the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicIsize::new(0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_or(0b110011, Ordering::SeqCst), 0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), 0b111111);</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_or</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_or</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
<span class="doccomment">/// Bitwise "xor" with the current value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Performs a bitwise "xor" operation on the current value and the argument `val`, and</span>
<span class="doccomment">/// sets the new value to the result.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the previous value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::{AtomicIsize, Ordering};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let foo = AtomicIsize::new(0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101);</span>
<span class="doccomment">/// assert_eq!(foo.load(Ordering::SeqCst), 0b011110);</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">stable</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_xor</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">int_type</span> {
<span class="kw">unsafe</span> { <span class="ident">atomic_xor</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">get</span>(), <span class="ident">val</span>, <span class="ident">order</span>) }
}
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">i8</span> <span class="ident">AtomicI8</span> <span class="ident">ATOMIC_I8_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">u8</span> <span class="ident">AtomicU8</span> <span class="ident">ATOMIC_U8_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"16"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">i16</span> <span class="ident">AtomicI16</span> <span class="ident">ATOMIC_I16_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"16"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">u16</span> <span class="ident">AtomicU16</span> <span class="ident">ATOMIC_U16_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"32"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">i32</span> <span class="ident">AtomicI32</span> <span class="ident">ATOMIC_I32_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"32"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">u32</span> <span class="ident">AtomicU32</span> <span class="ident">ATOMIC_U32_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">i64</span> <span class="ident">AtomicI64</span> <span class="ident">ATOMIC_I64_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"64"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span> {
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"integer_atomics"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32976"</span>),
<span class="ident">u64</span> <span class="ident">AtomicU64</span> <span class="ident">ATOMIC_U64_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span>{
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>),
<span class="ident">isize</span> <span class="ident">AtomicIsize</span> <span class="ident">ATOMIC_ISIZE_INIT</span>
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="macro">atomic_int</span><span class="macro">!</span>{
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extended_compare_and_swap"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>),
<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_access"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>),
<span class="ident">usize</span> <span class="ident">AtomicUsize</span> <span class="ident">ATOMIC_USIZE_INIT</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">strongest_failure_ordering</span>(<span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">Ordering</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">Relaxed</span>,
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">Relaxed</span>,
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">SeqCst</span>,
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">Acquire</span>,
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">Acquire</span>,
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="ident">__Nonexhaustive</span>,
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_store</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_store_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_store_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_store</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Acquire</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as an acquire store"</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as an acquire/release store"</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_load</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_load_acq</span>(<span class="ident">dst</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_load_relaxed</span>(<span class="ident">dst</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_load</span>(<span class="ident">dst</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as a release load"</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as an acquire/release load"</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_swap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xchg_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xchg_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xchg_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xchg_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xchg</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="doccomment">/// Returns the previous value (like __sync_fetch_and_add).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_add</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xadd_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xadd_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xadd_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xadd_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xadd</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="doccomment">/// Returns the previous value (like __sync_fetch_and_sub).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_sub</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xsub_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xsub_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xsub_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xsub_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xsub</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_compare_exchange</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">old</span>: <span class="ident">T</span>,
<span class="ident">new</span>: <span class="ident">T</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> (<span class="ident">val</span>, <span class="ident">ok</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">success</span>, <span class="ident">failure</span>) {
(<span class="ident">Acquire</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_acq</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Release</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_rel</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">AcqRel</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_acqrel</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Relaxed</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_relaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">SeqCst</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Acquire</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_acq_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">AcqRel</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_acqrel_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchg_failacq</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">__Nonexhaustive</span>, _) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
(_, <span class="ident">__Nonexhaustive</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
(_, <span class="ident">AcqRel</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as an acquire/release failure ordering"</span>),
(_, <span class="ident">Release</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as a release failure ordering"</span>),
_ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"a failure ordering can't be stronger than a success ordering"</span>),
};
<span class="kw">if</span> <span class="ident">ok</span> { <span class="prelude-val">Ok</span>(<span class="ident">val</span>) } <span class="kw">else</span> { <span class="prelude-val">Err</span>(<span class="ident">val</span>) }
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_compare_exchange_weak</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">old</span>: <span class="ident">T</span>,
<span class="ident">new</span>: <span class="ident">T</span>,
<span class="ident">success</span>: <span class="ident">Ordering</span>,
<span class="ident">failure</span>: <span class="ident">Ordering</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> (<span class="ident">val</span>, <span class="ident">ok</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">success</span>, <span class="ident">failure</span>) {
(<span class="ident">Acquire</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_acq</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Release</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_rel</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">AcqRel</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_acqrel</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Relaxed</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_relaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">SeqCst</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">Acquire</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_acq_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">AcqRel</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_acqrel_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">Relaxed</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_failrelaxed</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">SeqCst</span>, <span class="ident">Acquire</span>) <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_cxchgweak_failacq</span>(<span class="ident">dst</span>, <span class="ident">old</span>, <span class="ident">new</span>),
(<span class="ident">__Nonexhaustive</span>, _) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
(_, <span class="ident">__Nonexhaustive</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
(_, <span class="ident">AcqRel</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as an acquire/release failure ordering"</span>),
(_, <span class="ident">Release</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as a release failure ordering"</span>),
_ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"a failure ordering can't be stronger than a success ordering"</span>),
};
<span class="kw">if</span> <span class="ident">ok</span> { <span class="prelude-val">Ok</span>(<span class="ident">val</span>) } <span class="kw">else</span> { <span class="prelude-val">Err</span>(<span class="ident">val</span>) }
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_and</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_and_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_and_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_and_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_and_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_and</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_or</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_or_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_or_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_or_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_or_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_or</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_xor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">dst</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">order</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xor_acq</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xor_rel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xor_acqrel</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xor_relaxed</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_xor</span>(<span class="ident">dst</span>, <span class="ident">val</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
<span class="doccomment">/// An atomic fence.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Depending on the specified order, a fence prevents the compiler and CPU from</span>
<span class="doccomment">/// reordering certain types of memory operations around it.</span>
<span class="doccomment">/// That creates synchronizes-with relationships between it and atomic operations</span>
<span class="doccomment">/// or fences in other threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A fence 'A' which has (at least) [`Release`] ordering semantics, synchronizes</span>
<span class="doccomment">/// with a fence 'B' with (at least) [`Acquire`] semantics, if and only if there</span>
<span class="doccomment">/// exist operations X and Y, both operating on some atomic object 'M' such</span>
<span class="doccomment">/// that A is sequenced before X, Y is synchronized before B and Y observes</span>
<span class="doccomment">/// the change to M. This provides a happens-before dependence between A and B.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// Thread 1 Thread 2</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fence(Release); A --------------</span>
<span class="doccomment">/// x.store(3, Relaxed); X --------- |</span>
<span class="doccomment">/// | |</span>
<span class="doccomment">/// | |</span>
<span class="doccomment">/// -------------> Y if x.load(Relaxed) == 3 {</span>
<span class="doccomment">/// |-------> B fence(Acquire);</span>
<span class="doccomment">/// ...</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Atomic operations with [`Release`] or [`Acquire`] semantics can also synchronize</span>
<span class="doccomment">/// with a fence.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A fence which has [`SeqCst`] ordering, in addition to having both [`Acquire`]</span>
<span class="doccomment">/// and [`Release`] semantics, participates in the global program order of the</span>
<span class="doccomment">/// other [`SeqCst`] operations and/or fences.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Accepts [`Acquire`], [`Release`], [`AcqRel`] and [`SeqCst`] orderings.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Relaxed`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::atomic::AtomicBool;</span>
<span class="doccomment">/// use std::sync::atomic::fence;</span>
<span class="doccomment">/// use std::sync::atomic::Ordering;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // A mutual exclusion primitive based on spinlock.</span>
<span class="doccomment">/// pub struct Mutex {</span>
<span class="doccomment">/// flag: AtomicBool,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Mutex {</span>
<span class="doccomment">/// pub fn new() -> Mutex {</span>
<span class="doccomment">/// Mutex {</span>
<span class="doccomment">/// flag: AtomicBool::new(false),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// pub fn lock(&self) {</span>
<span class="doccomment">/// while !self.flag.compare_and_swap(false, true, Ordering::Relaxed) {}</span>
<span class="doccomment">/// // This fence syncronizes-with store in `unlock`.</span>
<span class="doccomment">/// fence(Ordering::Acquire);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// pub fn unlock(&self) {</span>
<span class="doccomment">/// self.flag.store(false, Ordering::Release);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Acquire`]: enum.Ordering.html#variant.Acquire</span>
<span class="doccomment">/// [`SeqCst`]: enum.Ordering.html#variant.SeqCst</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fence</span>(<span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_fence_acq</span>(),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_fence_rel</span>(),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_fence_acqrel</span>(),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_fence</span>(),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as a relaxed fence"</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
}
<span class="doccomment">/// A compiler memory fence.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `compiler_fence` does not emit any machine code, but prevents the compiler from re-ordering</span>
<span class="doccomment">/// memory operations across this point. Which reorderings are disallowed is dictated by the given</span>
<span class="doccomment">/// [`Ordering`]. Note that `compiler_fence` does *not* introduce inter-thread memory</span>
<span class="doccomment">/// synchronization; for that, a [`fence`] is needed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The re-ordering prevented by the different ordering semantics are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - with [`SeqCst`], no re-ordering of reads and writes across this point is allowed.</span>
<span class="doccomment">/// - with [`Release`], preceding reads and writes cannot be moved past subsequent writes.</span>
<span class="doccomment">/// - with [`Acquire`], subsequent reads and writes cannot be moved ahead of preceding reads.</span>
<span class="doccomment">/// - with [`AcqRel`], both of the above rules are enforced.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `order` is [`Relaxed`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`fence`]: fn.fence.html</span>
<span class="doccomment">/// [`Ordering`]: enum.Ordering.html</span>
<span class="doccomment">/// [`Acquire`]: enum.Ordering.html#variant.Acquire</span>
<span class="doccomment">/// [`SeqCst`]: enum.Ordering.html#variant.SeqCst</span>
<span class="doccomment">/// [`Release`]: enum.Ordering.html#variant.Release</span>
<span class="doccomment">/// [`AcqRel`]: enum.Ordering.html#variant.AcqRel</span>
<span class="doccomment">/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"compiler_fences"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41091"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compiler_fence</span>(<span class="ident">order</span>: <span class="ident">Ordering</span>) {
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="ident">order</span> {
<span class="ident">Acquire</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_singlethreadfence_acq</span>(),
<span class="ident">Release</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_singlethreadfence_rel</span>(),
<span class="ident">AcqRel</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_singlethreadfence_acqrel</span>(),
<span class="ident">SeqCst</span> <span class="op">=></span> <span class="ident">intrinsics</span>::<span class="ident">atomic_singlethreadfence</span>(),
<span class="ident">Relaxed</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no such thing as a relaxed compiler fence"</span>),
<span class="ident">__Nonexhaustive</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"invalid memory ordering"</span>),
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"8"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">AtomicBool</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"AtomicBool"</span>).<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>)).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_has_atomic</span> <span class="op">=</span> <span class="string">"ptr"</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"atomic_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">AtomicPtr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"AtomicPtr"</span>).<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>)).<span class="ident">finish</span>()
}
}
</pre>
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