| <!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="This type provides MUTual EXclusion based on spinning."><meta name="keywords" content="rust, rustlang, rust-lang, Mutex"><title>Mutex in spin - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" 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class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../spin/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Mutex</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.force_unlock">force_unlock</a></li><li><a href="#method.into_inner">into_inner</a></li><li><a href="#method.lock">lock</a></li><li><a href="#method.new">new</a></li><li><a href="#method.try_lock">try_lock</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-Debug-for-Mutex%3CT%3E">Debug</a></li><li><a href="#impl-Default-for-Mutex%3CT%3E">Default</a></li><li><a href="#impl-Send-for-Mutex%3CT%3E">Send</a></li><li><a href="#impl-Sync-for-Mutex%3CT%3E">Sync</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-Mutex%3CT%3E">!RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-Mutex%3CT%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Mutex%3CT%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-Mutex%3CT%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-Mutex%3CT%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-Mutex%3CT%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-Mutex%3CT%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-Mutex%3CT%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-Mutex%3CT%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-Mutex%3CT%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In spin</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="index.html">spin</a>::<wbr><a class="struct" href="#">Mutex</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../src/spin/mutex.rs.html#72-76">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct Mutex<T: ?Sized> { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This type provides MUTual EXclusion based on spinning.</p> |
| <h2 id="description"><a href="#description">Description</a></h2> |
| <p>The behaviour of these lock is similar to their namesakes in <code>std::sync</code>. they |
| differ on the following:</p> |
| <ul> |
| <li>The lock will not be poisoned in case of failure;</li> |
| </ul> |
| <h2 id="simple-examples"><a href="#simple-examples">Simple examples</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>spin; |
| <span class="kw">let </span>spin_mutex = spin::Mutex::new(<span class="number">0</span>); |
| |
| <span class="comment">// Modify the data |
| </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>data = spin_mutex.lock(); |
| <span class="kw-2">*</span>data = <span class="number">2</span>; |
| } |
| |
| <span class="comment">// Read the data |
| </span><span class="kw">let </span>answer = |
| { |
| <span class="kw">let </span>data = spin_mutex.lock(); |
| <span class="kw-2">*</span>data |
| }; |
| |
| <span class="macro">assert_eq!</span>(answer, <span class="number">2</span>);</code></pre></div> |
| <h2 id="thread-safety-example"><a href="#thread-safety-example">Thread-safety example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>spin; |
| <span class="kw">use </span>std::sync::{Arc, Barrier}; |
| |
| <span class="kw">let </span>numthreads = <span class="number">1000</span>; |
| <span class="kw">let </span>spin_mutex = Arc::new(spin::Mutex::new(<span class="number">0</span>)); |
| |
| <span class="comment">// We use a barrier to ensure the readout happens after all writing |
| </span><span class="kw">let </span>barrier = Arc::new(Barrier::new(numthreads + <span class="number">1</span>)); |
| |
| <span class="kw">for _ in </span>(<span class="number">0</span>..numthreads) |
| { |
| <span class="kw">let </span>my_barrier = barrier.clone(); |
| <span class="kw">let </span>my_lock = spin_mutex.clone(); |
| std::thread::spawn(<span class="kw">move</span>|| |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>guard = my_lock.lock(); |
| <span class="kw-2">*</span>guard += <span class="number">1</span>; |
| |
| <span class="comment">// Release the lock to prevent a deadlock |
| </span>drop(guard); |
| my_barrier.wait(); |
| }); |
| } |
| |
| barrier.wait(); |
| |
| <span class="kw">let </span>answer = { <span class="kw-2">*</span>spin_mutex.lock() }; |
| <span class="macro">assert_eq!</span>(answer, numthreads);</code></pre></div> |
| </div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Mutex%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#92-125">source</a><a href="#impl-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.new" class="method has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#109-116">source</a><h4 class="code-header">pub const fn <a href="#method.new" class="fnname">new</a>(user_data: T) -> <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h4></section></summary><div class="docblock"><p>Creates a new spinlock wrapping the supplied data.</p> |
| <p>May be used statically:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>spin; |
| |
| <span class="kw">static </span>MUTEX: spin::Mutex<()> = spin::Mutex::new(()); |
| |
| <span class="kw">fn </span>demo() { |
| <span class="kw">let </span>lock = MUTEX.lock(); |
| <span class="comment">// do something with lock |
| </span>drop(lock); |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_inner" class="method has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#119-124">source</a><h4 class="code-header">pub fn <a href="#method.into_inner" class="fnname">into_inner</a>(self) -> T</h4></section></summary><div class="docblock"><p>Consumes this mutex, returning the underlying data.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Mutex%3CT%3E-1" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#127-195">source</a><a href="#impl-Mutex%3CT%3E-1" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.lock" class="method has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#156-164">source</a><h4 class="code-header">pub fn <a href="#method.lock" class="fnname">lock</a>(&self) -> <a class="struct" href="struct.MutexGuard.html" title="struct spin::MutexGuard">MutexGuard</a><'_, T></h4></section></summary><div class="docblock"><p>Locks the spinlock and returns a guard.</p> |
| <p>The returned value may be dereferenced for data access |
| and the lock will be dropped when the guard falls out of scope.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>mylock = spin::Mutex::new(<span class="number">0</span>); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>data = mylock.lock(); |
| <span class="comment">// The lock is now locked and the data can be accessed |
| </span><span class="kw-2">*</span>data += <span class="number">1</span>; |
| <span class="comment">// The lock is implicitly dropped |
| </span>} |
| </code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force_unlock" class="method has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#173-175">source</a><h4 class="code-header">pub unsafe fn <a href="#method.force_unlock" class="fnname">force_unlock</a>(&self)</h4></section></summary><div class="docblock"><p>Force unlock the spinlock.</p> |
| <p>This is <em>extremely</em> unsafe if the lock is not held by the current |
| thread. However, this can be useful in some instances for exposing the |
| lock to FFI that doesn’t know how to deal with RAII.</p> |
| <p>If the lock isn’t held, this is a no-op.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_lock" class="method has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#179-194">source</a><h4 class="code-header">pub fn <a href="#method.try_lock" class="fnname">try_lock</a>(&self) -> Option<<a class="struct" href="struct.MutexGuard.html" title="struct spin::MutexGuard">MutexGuard</a><'_, T>></h4></section></summary><div class="docblock"><p>Tries to lock the mutex. If it is already locked, it will return None. Otherwise it returns |
| a guard within Some.</p> |
| </div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Debug-for-Mutex%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#197-209">source</a><a href="#impl-Debug-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Debug> Debug for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#199-208">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a class="fnname">fmt</a>(&self, f: &mut Formatter<'_>) -> Result</h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Default-for-Mutex%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#211-215">source</a><a href="#impl-Default-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Default> Default for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.default" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#212-214">source</a><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a class="fnname">default</a>() -> <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a>Read more</a></div></details></div></details><section id="impl-Send-for-Mutex%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#90">source</a><a href="#impl-Send-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Send> Send for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section><section id="impl-Sync-for-Mutex%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/mutex.rs.html#89">source</a><a href="#impl-Sync-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Send> Sync for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> !RefUnwindSafe for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T></h3></section><section id="impl-Unpin-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-Unpin-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> Unpin for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T><span class="where fmt-newline">where<br> T: Unpin,</span></h3></section><section id="impl-UnwindSafe-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> UnwindSafe for <a class="struct" href="struct.Mutex.html" title="struct spin::Mutex">Mutex</a><T><span class="where fmt-newline">where<br> T: UnwindSafe,</span></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-Any-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where<br> T: 'static + ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a class="fnname">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> From<T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where<br> U: From<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code>[From]<T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where<br> U: Into<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-Mutex%3CT%3E" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-Mutex%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where<br> U: TryFrom<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="spin" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
