| <!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="A reader-writer lock"><meta name="keywords" content="rust, rustlang, rust-lang, RwLock"><title>RwLock 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" href="../normalize.css"><link rel="stylesheet" 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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="#">RwLock</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.force_read_decrement">force_read_decrement</a></li><li><a href="#method.force_write_unlock">force_write_unlock</a></li><li><a href="#method.into_inner">into_inner</a></li><li><a href="#method.new">new</a></li><li><a href="#method.read">read</a></li><li><a href="#method.try_read">try_read</a></li><li><a href="#method.try_upgradeable_read">try_upgradeable_read</a></li><li><a href="#method.try_write">try_write</a></li><li><a href="#method.upgradeable_read">upgradeable_read</a></li><li><a href="#method.write">write</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-Debug-for-RwLock%3CT%3E">Debug</a></li><li><a href="#impl-Default-for-RwLock%3CT%3E">Default</a></li><li><a href="#impl-Send-for-RwLock%3CT%3E">Send</a></li><li><a href="#impl-Sync-for-RwLock%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-RwLock%3CT%3E">!RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-RwLock%3CT%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-RwLock%3CT%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-RwLock%3CT%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-RwLock%3CT%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-RwLock%3CT%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-RwLock%3CT%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-RwLock%3CT%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-RwLock%3CT%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-RwLock%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="#">RwLock</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/rw_lock.rs.html#59-62">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 RwLock<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>A reader-writer lock</p> |
| <p>This type of lock allows a number of readers or at most one writer at any |
| point in time. The write portion of this lock typically allows modification |
| of the underlying data (exclusive access) and the read portion of this lock |
| typically allows for read-only access (shared access).</p> |
| <p>The type parameter <code>T</code> represents the data that this lock protects. It is |
| required that <code>T</code> satisfies <code>Send</code> to be shared across tasks and <code>Sync</code> to |
| allow concurrent access through readers. The RAII guards returned from the |
| locking methods implement <code>Deref</code> (and <code>DerefMut</code> for the <code>write</code> methods) |
| to allow access to the contained of the lock.</p> |
| <p>An <a href="struct.RwLockUpgradeableGuard.html"><code>RwLockUpgradeableGuard</code></a> can be upgraded to a |
| writable guard through the <a href="struct.RwLockUpgradeableGuard.html#method.upgrade"><code>RwLockUpgradeableGuard::upgrade</code></a> |
| <a href="struct.RwLockUpgradeableGuard.html#method.try_upgrade"><code>RwLockUpgradeableGuard::try_upgrade</code></a> functions. |
| Writable or upgradeable guards can be downgraded through their respective <code>downgrade</code> |
| functions.</p> |
| <p>Based on Facebook’s |
| <a href="https://github.com/facebook/folly/blob/a0394d84f2d5c3e50ebfd0566f9d3acb52cfab5a/folly/synchronization/RWSpinLock.h"><code>folly/RWSpinLock.h</code></a>. |
| This implementation is unfair to writers - if the lock always has readers, then no writers will |
| ever get a chance. Using an upgradeable lock guard can <em>somewhat</em> alleviate this issue as no |
| new readers are allowed when an upgradeable guard is held, but upgradeable guards can be taken |
| when there are existing readers. However if the lock is that highly contended and writes are |
| crucial then this implementation may be a poor choice.</p> |
| <h2 id="examples"><a href="#examples">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>lock = spin::RwLock::new(<span class="number">5</span>); |
| |
| <span class="comment">// many reader locks can be held at once |
| </span>{ |
| <span class="kw">let </span>r1 = lock.read(); |
| <span class="kw">let </span>r2 = lock.read(); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>r1, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>r2, <span class="number">5</span>); |
| } <span class="comment">// read locks are dropped at this point |
| |
| // only one write lock may be held, however |
| </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>w = lock.write(); |
| <span class="kw-2">*</span>w += <span class="number">1</span>; |
| <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>w, <span class="number">6</span>); |
| } <span class="comment">// write lock is dropped here</span></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-RwLock%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#109-141">source</a><a href="#impl-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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/rw_lock.rs.html#126-131">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.RwLock.html" title="struct spin::RwLock">RwLock</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>RW_LOCK: spin::RwLock<()> = spin::RwLock::new(()); |
| |
| <span class="kw">fn </span>demo() { |
| <span class="kw">let </span>lock = RW_LOCK.read(); |
| <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/rw_lock.rs.html#135-140">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 <code>RwLock</code>, returning the underlying data.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-RwLock%3CT%3E-1" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#143-340">source</a><a href="#impl-RwLock%3CT%3E-1" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.read" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#166-173">source</a><h4 class="code-header">pub fn <a href="#method.read" class="fnname">read</a>(&self) -> <a class="struct" href="struct.RwLockReadGuard.html" title="struct spin::RwLockReadGuard">RwLockReadGuard</a><'_, T></h4></section></summary><div class="docblock"><p>Locks this rwlock with shared read access, blocking the current thread |
| until it can be acquired.</p> |
| <p>The calling thread will be blocked until there are no more writers which |
| hold the lock. There may be other readers currently inside the lock when |
| this method returns. This method does not provide any guarantees with |
| respect to the ordering of whether contentious readers or writers will |
| acquire the lock first.</p> |
| <p>Returns an RAII guard which will release this thread’s shared access |
| once it is dropped.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>mylock = spin::RwLock::new(<span class="number">0</span>); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>data = mylock.read(); |
| <span class="comment">// The lock is now locked and the data can be read |
| </span><span class="macro">println!</span>(<span class="string">"{}"</span>, <span class="kw-2">*</span>data); |
| <span class="comment">// The lock is dropped |
| </span>}</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_read" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#198-213">source</a><h4 class="code-header">pub fn <a href="#method.try_read" class="fnname">try_read</a>(&self) -> Option<<a class="struct" href="struct.RwLockReadGuard.html" title="struct spin::RwLockReadGuard">RwLockReadGuard</a><'_, T>></h4></section></summary><div class="docblock"><p>Attempt to acquire this lock with shared read access.</p> |
| <p>This function will never block and will return immediately if <code>read</code> |
| would otherwise succeed. Returns <code>Some</code> of an RAII guard which will |
| release the shared access of this thread when dropped, or <code>None</code> if the |
| access could not be granted. This method does not provide any |
| guarantees with respect to the ordering of whether contentious readers |
| or writers will acquire the lock first.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>mylock = spin::RwLock::new(<span class="number">0</span>); |
| { |
| <span class="kw">match </span>mylock.try_read() { |
| <span class="prelude-val">Some</span>(data) => { |
| <span class="comment">// The lock is now locked and the data can be read |
| </span><span class="macro">println!</span>(<span class="string">"{}"</span>, <span class="kw-2">*</span>data); |
| <span class="comment">// The lock is dropped |
| </span>}, |
| <span class="prelude-val">None </span>=> (), <span class="comment">// no cigar |
| </span>}; |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force_read_decrement" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#222-225">source</a><h4 class="code-header">pub unsafe fn <a href="#method.force_read_decrement" class="fnname">force_read_decrement</a>(&self)</h4></section></summary><div class="docblock"><p>Force decrement the reader count.</p> |
| <p>This is <em>extremely</em> unsafe if there are outstanding <code>RwLockReadGuard</code>s |
| live, or if called more times than <code>read</code> has been called, but can be |
| useful in FFI contexts where the caller doesn’t know how to deal with |
| RAII. The underlying atomic operation uses <code>Ordering::Release</code>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force_write_unlock" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#234-237">source</a><h4 class="code-header">pub unsafe fn <a href="#method.force_write_unlock" class="fnname">force_write_unlock</a>(&self)</h4></section></summary><div class="docblock"><p>Force unlock exclusive write access.</p> |
| <p>This is <em>extremely</em> unsafe if there are outstanding <code>RwLockWriteGuard</code>s |
| live, or if called when there are current readers, but can be useful in |
| FFI contexts where the caller doesn’t know how to deal with RAII. The |
| underlying atomic operation uses <code>Ordering::Release</code>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.write" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#280-287">source</a><h4 class="code-header">pub fn <a href="#method.write" class="fnname">write</a>(&self) -> <a class="struct" href="struct.RwLockWriteGuard.html" title="struct spin::RwLockWriteGuard">RwLockWriteGuard</a><'_, T></h4></section></summary><div class="docblock"><p>Lock this rwlock with exclusive write access, blocking the current |
| thread until it can be acquired.</p> |
| <p>This function will not return while other writers or other readers |
| currently have access to the lock.</p> |
| <p>Returns an RAII guard which will drop the write access of this rwlock |
| when dropped.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>mylock = spin::RwLock::new(<span class="number">0</span>); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>data = mylock.write(); |
| <span class="comment">// The lock is now locked and the data can be written |
| </span><span class="kw-2">*</span>data += <span class="number">1</span>; |
| <span class="comment">// The lock is dropped |
| </span>}</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_write" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#309-311">source</a><h4 class="code-header">pub fn <a href="#method.try_write" class="fnname">try_write</a>(&self) -> Option<<a class="struct" href="struct.RwLockWriteGuard.html" title="struct spin::RwLockWriteGuard">RwLockWriteGuard</a><'_, T>></h4></section></summary><div class="docblock"><p>Attempt to lock this rwlock with exclusive write access.</p> |
| <p>This function does not ever block, and it will return <code>None</code> if a call |
| to <code>write</code> would otherwise block. If successful, an RAII guard is |
| returned.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>mylock = spin::RwLock::new(<span class="number">0</span>); |
| { |
| <span class="kw">match </span>mylock.try_write() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">mut </span>data) => { |
| <span class="comment">// The lock is now locked and the data can be written |
| </span><span class="kw-2">*</span>data += <span class="number">1</span>; |
| <span class="comment">// The lock is implicitly dropped |
| </span>}, |
| <span class="prelude-val">None </span>=> (), <span class="comment">// no cigar |
| </span>}; |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.upgradeable_read" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#316-323">source</a><h4 class="code-header">pub fn <a href="#method.upgradeable_read" class="fnname">upgradeable_read</a>(&self) -> <a class="struct" href="struct.RwLockUpgradeableGuard.html" title="struct spin::RwLockUpgradeableGuard">RwLockUpgradeableGuard</a><'_, T></h4></section></summary><div class="docblock"><p>Obtain a readable lock guard that can later be upgraded to a writable lock guard. |
| Upgrades can be done through the <a href="struct.RwLockUpgradeableGuard.html#method.upgrade"><code>RwLockUpgradeableGuard::upgrade</code></a> method.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_upgradeable_read" class="method has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#327-339">source</a><h4 class="code-header">pub fn <a href="#method.try_upgradeable_read" class="fnname">try_upgradeable_read</a>(&self) -> Option<<a class="struct" href="struct.RwLockUpgradeableGuard.html" title="struct spin::RwLockUpgradeableGuard">RwLockUpgradeableGuard</a><'_, T>></h4></section></summary><div class="docblock"><p>Tries to obtain an upgradeable lock guard.</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-RwLock%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#342-351">source</a><a href="#impl-Debug-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Debug> Debug for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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/rw_lock.rs.html#343-350">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-RwLock%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#353-357">source</a><a href="#impl-Default-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Default> Default for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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/rw_lock.rs.html#354-356">source</a><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a class="fnname">default</a>() -> <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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-RwLock%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#106">source</a><a href="#impl-Send-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Send> Send for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</a><T></h3></section><section id="impl-Sync-for-RwLock%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/spin/rw_lock.rs.html#107">source</a><a href="#impl-Sync-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized + Send + Sync> Sync for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T> !RefUnwindSafe for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</a><T></h3></section><section id="impl-Unpin-for-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-Unpin-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> Unpin for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</a><T><span class="where fmt-newline">where<br> T: Unpin,</span></h3></section><section id="impl-UnwindSafe-for-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-RwLock%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: ?Sized> UnwindSafe for <a class="struct" href="struct.RwLock.html" title="struct spin::RwLock">RwLock</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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-Any-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-RwLock%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-RwLock%3CT%3E" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-RwLock%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> |
