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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `AtomicPtr` struct in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, AtomicPtr"><title>core::sync::atomic::AtomicPtr - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><p class='location'>Struct AtomicPtr</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.get_mut">get_mut</a><a href="#method.into_inner">into_inner</a><a href="#method.load">load</a><a href="#method.store">store</a><a href="#method.swap">swap</a><a href="#method.compare_and_swap">compare_and_swap</a><a href="#method.compare_exchange">compare_exchange</a><a href="#method.compare_exchange_weak">compare_exchange_weak</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Default">Default</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a><a href="#impl-From%3C*mut%20T%3E">From&lt;*mut T&gt;</a><a href="#impl-Debug">Debug</a><a href="#impl-Pointer">Pointer</a></div></div><p class='location'><a href='../../index.html'>core</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>atomic</a></p><script>window.sidebarCurrent = {name: 'AtomicPtr', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>core</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>atomic</a>::<wbr><a class="struct" href=''>AtomicPtr</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../../src/core/sync/atomic.rs.html#150-152' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct AtomicPtr&lt;T&gt; { /* fields omitted */ }</pre></div><div class='docblock'><p>A raw pointer type which can be safely shared between threads.</p>
<p>This type has the same in-memory representation as a <code>*mut T</code>.</p>
</div>
                    <h2 id='methods' class='small-section-header'>
                      Methods<a href='#methods' class='anchor'></a>
                    </h2>
                <h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#649-929' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub const fn <a href='#method.new' class='fnname'>new</a>(p: *mut T) -&gt; <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#662-664' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a new <code>AtomicPtr</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::<span class="ident">AtomicPtr</span>;

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">atomic_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3AAtomicPtr%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20atomic_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.get_mut' class="method"><span id='get_mut.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&amp;mut self) -&gt; &amp;mut *mut T</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.15.0'>1.15.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#682-684' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a mutable reference to the underlying pointer.</p>
<p>This is safe because the mutable reference guarantees that no other threads are
concurrently accessing the atomic data.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">atomic_ptr</span> <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>);
<span class="kw-2">*</span><span class="ident">atomic_ptr</span>.<span class="ident">get_mut</span>() <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="ident">atomic_ptr</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) }, <span class="number">5</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20mut%20atomic_ptr%20%3D%20AtomicPtr%3A%3Anew(%26mut%2010)%3B%0A*atomic_ptr.get_mut()%20%3D%20%26mut%205%3B%0Aassert_eq!(unsafe%20%7B%20*atomic_ptr.load(Ordering%3A%3ASeqCst)%20%7D%2C%205)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.into_inner' class="method"><span id='into_inner.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -&gt; *mut T</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.15.0'>1.15.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#701-703' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Consumes the atomic and returns the contained value.</p>
<p>This is safe because passing <code>self</code> by value guarantees that no other threads are
concurrently accessing the atomic data.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::<span class="ident">AtomicPtr</span>;

<span class="kw">let</span> <span class="ident">atomic_ptr</span> <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw">unsafe</span> { <span class="kw-2">*</span><span class="ident">atomic_ptr</span>.<span class="ident">into_inner</span>() }, <span class="number">5</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3AAtomicPtr%3B%0A%0Alet%20atomic_ptr%20%3D%20AtomicPtr%3A%3Anew(%26mut%205)%3B%0Aassert_eq!(unsafe%20%7B%20*atomic_ptr.into_inner()%20%7D%2C%205)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.load' class="method"><span id='load.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.load' class='fnname'>load</a>(&amp;self, order: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a>) -&gt; *mut T</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#730-732' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Loads a value from the pointer.</p>
<p><code>load</code> takes an <a href="enum.Ordering.html"><code>Ordering</code></a> argument which describes the memory ordering
of this operation.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Panics if <code>order</code> is <a href="enum.Ordering.html#variant.Release"><code>Release</code></a> or <a href="enum.Ordering.html#variant.AcqRel"><code>AcqRel</code></a>.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">some_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);

<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">some_ptr</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20some_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%0Alet%20value%20%3D%20some_ptr.load(Ordering%3A%3ARelaxed)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.store' class="method"><span id='store.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.store' class='fnname'>store</a>(&amp;self, ptr: *mut T, order: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#762-766' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Stores a value into the pointer.</p>
<p><code>store</code> takes an <a href="enum.Ordering.html"><code>Ordering</code></a> argument which describes the memory ordering
of this operation.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">some_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);

<span class="kw">let</span> <span class="ident">other_ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;

<span class="ident">some_ptr</span>.<span class="ident">store</span>(<span class="ident">other_ptr</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20some_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%0Alet%20other_ptr%20%3D%20%26mut%2010%3B%0A%0Asome_ptr.store(other_ptr%2C%20Ordering%3A%3ARelaxed)%3B%0A%7D">Run</a></pre>
<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
<p>Panics if <code>order</code> is <a href="enum.Ordering.html#variant.Acquire"><code>Acquire</code></a> or <a href="enum.Ordering.html#variant.AcqRel"><code>AcqRel</code></a>.</p>
</div><h4 id='method.swap' class="method"><span id='swap.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.swap' class='fnname'>swap</a>(&amp;self, ptr: *mut T, order: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a>) -&gt; *mut T</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#789-791' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Stores a value into the pointer, returning the previous value.</p>
<p><code>swap</code> takes an <a href="enum.Ordering.html"><code>Ordering</code></a> argument which describes the memory ordering
of this operation.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">some_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);

<span class="kw">let</span> <span class="ident">other_ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;

<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">some_ptr</span>.<span class="ident">swap</span>(<span class="ident">other_ptr</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20some_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%0Alet%20other_ptr%20%3D%20%26mut%2010%3B%0A%0Alet%20value%20%3D%20some_ptr.swap(other_ptr%2C%20Ordering%3A%3ARelaxed)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.compare_and_swap' class="method"><span id='compare_and_swap.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.compare_and_swap' class='fnname'>compare_and_swap</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;current: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;new: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;order: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a><br>) -&gt; *mut T</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#818-823' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Stores a value into the pointer if the current value is the same as the <code>current</code> value.</p>
<p>The return value is always the previous value. If it is equal to <code>current</code>, then the value
was updated.</p>
<p><code>compare_and_swap</code> also takes an <a href="enum.Ordering.html"><code>Ordering</code></a> argument which describes the memory
ordering of this operation.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">some_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);

<span class="kw">let</span> <span class="ident">other_ptr</span>   <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;
<span class="kw">let</span> <span class="ident">another_ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;

<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">some_ptr</span>.<span class="ident">compare_and_swap</span>(<span class="ident">other_ptr</span>, <span class="ident">another_ptr</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20some_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%0Alet%20other_ptr%20%20%20%3D%20%26mut%2010%3B%0Alet%20another_ptr%20%3D%20%26mut%2010%3B%0A%0Alet%20value%20%3D%20some_ptr.compare_and_swap(other_ptr%2C%20another_ptr%2C%20Ordering%3A%3ARelaxed)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.compare_exchange' class="method"><span id='compare_exchange.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.compare_exchange' class='fnname'>compare_exchange</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;current: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;new: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;success: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;failure: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a><br>) -&gt; <a class="enum" href="../../../core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;*mut T, *mut T&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#856-873' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Stores a value into the pointer if the current value is the same as the <code>current</code> value.</p>
<p>The return value is a result indicating whether the new value was written and containing
the previous value. On success this value is guaranteed to be equal to <code>current</code>.</p>
<p><code>compare_exchange</code> takes two <a href="enum.Ordering.html"><code>Ordering</code></a> arguments to describe the memory
ordering of this operation. The first describes the required ordering if
the operation succeeds while the second describes the required ordering when
the operation fails. The failure ordering can't be <a href="enum.Ordering.html#variant.Release"><code>Release</code></a> or <a href="enum.Ordering.html#variant.AcqRel"><code>AcqRel</code></a>
and must be equivalent or weaker than the success ordering.</p>
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">some_ptr</span>  <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="ident">ptr</span>);

<span class="kw">let</span> <span class="ident">other_ptr</span>   <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;
<span class="kw">let</span> <span class="ident">another_ptr</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;

<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">some_ptr</span>.<span class="ident">compare_exchange</span>(<span class="ident">other_ptr</span>, <span class="ident">another_ptr</span>,
                                      <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20ptr%20%3D%20%26mut%205%3B%0Alet%20some_ptr%20%20%3D%20AtomicPtr%3A%3Anew(ptr)%3B%0A%0Alet%20other_ptr%20%20%20%3D%20%26mut%2010%3B%0Alet%20another_ptr%20%3D%20%26mut%2010%3B%0A%0Alet%20value%20%3D%20some_ptr.compare_exchange(other_ptr%2C%20another_ptr%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Ordering%3A%3ASeqCst%2C%20Ordering%3A%3ARelaxed)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.compare_exchange_weak' class="method"><span id='compare_exchange_weak.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.compare_exchange_weak' class='fnname'>compare_exchange_weak</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;current: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;new: *mut T, <br>&nbsp;&nbsp;&nbsp;&nbsp;success: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;failure: <a class="enum" href="../../../core/sync/atomic/enum.Ordering.html" title="enum core::sync::atomic::Ordering">Ordering</a><br>) -&gt; <a class="enum" href="../../../core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;*mut T, *mut T&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#911-928' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Stores a value into the pointer if the current value is the same as the <code>current</code> value.</p>
<p>Unlike <a href="#method.compare_exchange"><code>compare_exchange</code></a>, this function is allowed to spuriously fail even when the
comparison succeeds, which can result in more efficient code on some platforms. The
return value is a result indicating whether the new value was written and containing the
previous value.</p>
<p><code>compare_exchange_weak</code> takes two <a href="enum.Ordering.html"><code>Ordering</code></a> arguments to describe the memory
ordering of this operation. The first describes the required ordering if the operation
succeeds while the second describes the required ordering when the operation fails. The
failure ordering can't be <a href="enum.Ordering.html#variant.Release"><code>Release</code></a> or <a href="enum.Ordering.html#variant.AcqRel"><code>AcqRel</code></a> and must be equivalent or
weaker than the success ordering.</p>
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">Ordering</span>};

<span class="kw">let</span> <span class="ident">some_ptr</span> <span class="op">=</span> <span class="ident">AtomicPtr</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">5</span>);

<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="number">10</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">old</span> <span class="op">=</span> <span class="ident">some_ptr</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
<span class="kw">loop</span> {
    <span class="kw">match</span> <span class="ident">some_ptr</span>.<span class="ident">compare_exchange_weak</span>(<span class="ident">old</span>, <span class="ident">new</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>, <span class="ident">Ordering</span>::<span class="ident">Relaxed</span>) {
        <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=&gt;</span> <span class="kw">break</span>,
        <span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=&gt;</span> <span class="ident">old</span> <span class="op">=</span> <span class="ident">x</span>,
    }
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Aatomic%3A%3A%7BAtomicPtr%2C%20Ordering%7D%3B%0A%0Alet%20some_ptr%20%3D%20AtomicPtr%3A%3Anew(%26mut%205)%3B%0A%0Alet%20new%20%3D%20%26mut%2010%3B%0Alet%20mut%20old%20%3D%20some_ptr.load(Ordering%3A%3ARelaxed)%3B%0Aloop%20%7B%0A%20%20%20%20match%20some_ptr.compare_exchange_weak(old%2C%20new%2C%20Ordering%3A%3ASeqCst%2C%20Ordering%3A%3ARelaxed)%20%7B%0A%20%20%20%20%20%20%20%20Ok(_)%20%3D%3E%20break%2C%0A%20%20%20%20%20%20%20%20Err(x)%20%3D%3E%20old%20%3D%20x%2C%0A%20%20%20%20%7D%0A%7D%0A%7D">Run</a></pre>
</div></div>
                <h2 id='implementations' class='small-section-header'>
                  Trait Implementations<a href='#implementations' class='anchor'></a>
                </h2>
                <div id='implementations-list'><h3 id='impl-Default' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-Default' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#156-161' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../../core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -&gt; <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#158-160' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a null <code>AtomicPtr&lt;T&gt;</code>.</p>
</div></div><h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#165' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#168' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-From%3C*mut%20T%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;*mut T&gt; for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-From%3C*mut%20T%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.23.0'>1.23.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#940-943' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from' class="method"><span id='from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../../core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(p: *mut T) -&gt; Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#942' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#2097-2101' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#2098-2100' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="../../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Pointer' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl&lt;T&gt; <a class="trait" href="../../../core/fmt/trait.Pointer.html" title="trait core::fmt::Pointer">Pointer</a> for <a class="struct" href="../../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a>&lt;T&gt;</code><a href='#impl-Pointer' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.24.0'>1.24.0</div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#2105-2109' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../../core/fmt/trait.Pointer.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/core/sync/atomic.rs.html#2106-2108' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter.</p>
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