| <!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="Source of the Rust file `/root/.cargo/git/checkouts/tokio-377c595163f99a10/dfe252d/tokio/src/sync/rwlock/owned_write_guard.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>owned_write_guard.rs - source</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" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../tokio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../tokio/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><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="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::sync::rwlock::owned_read_guard::OwnedRwLockReadGuard; |
| <span class="kw">use </span><span class="kw">crate</span>::sync::rwlock::owned_write_guard_mapped::OwnedRwLockMappedWriteGuard; |
| <span class="kw">use </span><span class="kw">crate</span>::sync::rwlock::RwLock; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::mem::{<span class="self">self</span>, ManuallyDrop}; |
| <span class="kw">use </span>std::ops; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="doccomment">/// Owned RAII structure used to release the exclusive write access of a lock when |
| /// dropped. |
| /// |
| /// This structure is created by the [`write_owned`] method |
| /// on [`RwLock`]. |
| /// |
| /// [`write_owned`]: method@crate::sync::RwLock::write_owned |
| /// [`RwLock`]: struct@crate::sync::RwLock |
| </span><span class="kw">pub struct </span>OwnedRwLockWriteGuard<T: <span class="question-mark">?</span>Sized> { |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) resource_span: tracing::Span, |
| <span class="kw">pub</span>(<span class="kw">super</span>) permits_acquired: u32, |
| <span class="comment">// ManuallyDrop allows us to destructure into this field without running the destructor. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) lock: ManuallyDrop<Arc<RwLock<T>>>, |
| <span class="kw">pub</span>(<span class="kw">super</span>) data: <span class="kw-2">*mut </span>T, |
| <span class="kw">pub</span>(<span class="kw">super</span>) _p: PhantomData<T>, |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> OwnedRwLockWriteGuard<T> { |
| <span class="doccomment">/// Makes a new [`OwnedRwLockMappedWriteGuard`] for a component of the locked |
| /// data. |
| /// |
| /// This operation cannot fail as the `OwnedRwLockWriteGuard` passed in |
| /// already locked the data. |
| /// |
| /// This is an associated function that needs to be used as |
| /// `OwnedRwLockWriteGuard::map(..)`. A method would interfere with methods |
| /// of the same name on the contents of the locked data. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::sync::Arc; |
| /// use tokio::sync::{RwLock, OwnedRwLockWriteGuard}; |
| /// |
| /// #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| /// struct Foo(u32); |
| /// |
| /// # #[tokio::main] |
| /// # async fn main() { |
| /// let lock = Arc::new(RwLock::new(Foo(1))); |
| /// |
| /// { |
| /// let lock = Arc::clone(&lock); |
| /// let mut mapped = OwnedRwLockWriteGuard::map(lock.write_owned().await, |f| &mut f.0); |
| /// *mapped = 2; |
| /// } |
| /// |
| /// assert_eq!(Foo(2), *lock.read().await); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>map<F, U: <span class="question-mark">?</span>Sized>(<span class="kw-2">mut </span>this: <span class="self">Self</span>, f: F) -> OwnedRwLockMappedWriteGuard<T, U> |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span>T) -> <span class="kw-2">&mut </span>U, |
| { |
| <span class="kw">let </span>data = f(<span class="kw-2">&mut *</span>this) <span class="kw">as </span><span class="kw-2">*mut </span>U; |
| <span class="kw">let </span>lock = <span class="kw">unsafe </span>{ ManuallyDrop::take(<span class="kw-2">&mut </span>this.lock) }; |
| <span class="kw">let </span>permits_acquired = this.permits_acquired; |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="kw">let </span>resource_span = this.resource_span.clone(); |
| <span class="comment">// NB: Forget to avoid drop impl from being called. |
| </span>mem::forget(this); |
| |
| OwnedRwLockMappedWriteGuard { |
| permits_acquired, |
| lock: ManuallyDrop::new(lock), |
| data, |
| _p: PhantomData, |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span>resource_span, |
| } |
| } |
| |
| <span class="doccomment">/// Attempts to make a new [`OwnedRwLockMappedWriteGuard`] for a component |
| /// of the locked data. The original guard is returned if the closure |
| /// returns `None`. |
| /// |
| /// This operation cannot fail as the `OwnedRwLockWriteGuard` passed in |
| /// already locked the data. |
| /// |
| /// This is an associated function that needs to be |
| /// used as `OwnedRwLockWriteGuard::try_map(...)`. A method would interfere |
| /// with methods of the same name on the contents of the locked data. |
| /// |
| /// [`RwLockMappedWriteGuard`]: struct@crate::sync::RwLockMappedWriteGuard |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use std::sync::Arc; |
| /// use tokio::sync::{RwLock, OwnedRwLockWriteGuard}; |
| /// |
| /// #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| /// struct Foo(u32); |
| /// |
| /// # #[tokio::main] |
| /// # async fn main() { |
| /// let lock = Arc::new(RwLock::new(Foo(1))); |
| /// |
| /// { |
| /// let guard = Arc::clone(&lock).write_owned().await; |
| /// let mut guard = OwnedRwLockWriteGuard::try_map(guard, |f| Some(&mut f.0)).expect("should not fail"); |
| /// *guard = 2; |
| /// } |
| /// |
| /// assert_eq!(Foo(2), *lock.read().await); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>try_map<F, U: <span class="question-mark">?</span>Sized>( |
| <span class="kw-2">mut </span>this: <span class="self">Self</span>, |
| f: F, |
| ) -> <span class="prelude-ty">Result</span><OwnedRwLockMappedWriteGuard<T, U>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&mut </span>T) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>U>, |
| { |
| <span class="kw">let </span>data = <span class="kw">match </span>f(<span class="kw-2">&mut *</span>this) { |
| <span class="prelude-val">Some</span>(data) => data <span class="kw">as </span><span class="kw-2">*mut </span>U, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(this), |
| }; |
| <span class="kw">let </span>permits_acquired = this.permits_acquired; |
| <span class="kw">let </span>lock = <span class="kw">unsafe </span>{ ManuallyDrop::take(<span class="kw-2">&mut </span>this.lock) }; |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="kw">let </span>resource_span = this.resource_span.clone(); |
| |
| <span class="comment">// NB: Forget to avoid drop impl from being called. |
| </span>mem::forget(this); |
| |
| <span class="prelude-val">Ok</span>(OwnedRwLockMappedWriteGuard { |
| permits_acquired, |
| lock: ManuallyDrop::new(lock), |
| data, |
| _p: PhantomData, |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span>resource_span, |
| }) |
| } |
| |
| <span class="doccomment">/// Converts this `OwnedRwLockWriteGuard` into an |
| /// `OwnedRwLockMappedWriteGuard`. This method can be used to store a |
| /// non-mapped guard in a struct field that expects a mapped guard. |
| /// |
| /// This is equivalent to calling `OwnedRwLockWriteGuard::map(guard, |me| me)`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>into_mapped(this: <span class="self">Self</span>) -> OwnedRwLockMappedWriteGuard<T> { |
| <span class="self">Self</span>::map(this, |me| me) |
| } |
| |
| <span class="doccomment">/// Atomically downgrades a write lock into a read lock without allowing |
| /// any writers to take exclusive access of the lock in the meantime. |
| /// |
| /// **Note:** This won't *necessarily* allow any additional readers to acquire |
| /// locks, since [`RwLock`] is fair and it is possible that a writer is next |
| /// in line. |
| /// |
| /// Returns an RAII guard which will drop this read access of the `RwLock` |
| /// when dropped. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use tokio::sync::RwLock; |
| /// # use std::sync::Arc; |
| /// # |
| /// # #[tokio::main] |
| /// # async fn main() { |
| /// let lock = Arc::new(RwLock::new(1)); |
| /// |
| /// let n = lock.clone().write_owned().await; |
| /// |
| /// let cloned_lock = lock.clone(); |
| /// let handle = tokio::spawn(async move { |
| /// *cloned_lock.write_owned().await = 2; |
| /// }); |
| /// |
| /// let n = n.downgrade(); |
| /// assert_eq!(*n, 1, "downgrade is atomic"); |
| /// |
| /// drop(n); |
| /// handle.await.unwrap(); |
| /// assert_eq!(*lock.read().await, 2, "second writer obtained write lock"); |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>downgrade(<span class="kw-2">mut </span><span class="self">self</span>) -> OwnedRwLockReadGuard<T> { |
| <span class="kw">let </span>lock = <span class="kw">unsafe </span>{ ManuallyDrop::take(<span class="kw-2">&mut </span><span class="self">self</span>.lock) }; |
| <span class="kw">let </span>data = <span class="self">self</span>.data; |
| <span class="kw">let </span>to_release = (<span class="self">self</span>.permits_acquired - <span class="number">1</span>) <span class="kw">as </span>usize; |
| |
| <span class="comment">// Release all but one of the permits held by the write guard |
| </span>lock.s.release(to_release); |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="self">self</span>.resource_span.in_scope(|| { |
| <span class="macro">tracing::trace!</span>( |
| target: <span class="string">"runtime::resource::state_update"</span>, |
| write_locked = <span class="bool-val">false</span>, |
| write_locked.op = <span class="string">"override"</span>, |
| ) |
| }); |
| |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="self">self</span>.resource_span.in_scope(|| { |
| <span class="macro">tracing::trace!</span>( |
| target: <span class="string">"runtime::resource::state_update"</span>, |
| current_readers = <span class="number">1</span>, |
| current_readers.op = <span class="string">"add"</span>, |
| ) |
| }); |
| |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="kw">let </span>resource_span = <span class="self">self</span>.resource_span.clone(); |
| <span class="comment">// NB: Forget to avoid drop impl from being called. |
| </span>mem::forget(<span class="self">self</span>); |
| |
| OwnedRwLockReadGuard { |
| lock: ManuallyDrop::new(lock), |
| data, |
| _p: PhantomData, |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span>resource_span, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> ops::Deref <span class="kw">for </span>OwnedRwLockWriteGuard<T> { |
| <span class="kw">type </span>Target = T; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.data } |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> ops::DerefMut <span class="kw">for </span>OwnedRwLockWriteGuard<T> { |
| <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.data } |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> fmt::Debug <span class="kw">for </span>OwnedRwLockWriteGuard<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt::Debug::fmt(<span class="kw-2">&**</span><span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> fmt::Display <span class="kw">for </span>OwnedRwLockWriteGuard<T> |
| <span class="kw">where |
| </span>T: fmt::Display, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt::Display::fmt(<span class="kw-2">&**</span><span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> Drop <span class="kw">for </span>OwnedRwLockWriteGuard<T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.lock.s.release(<span class="self">self</span>.permits_acquired <span class="kw">as </span>usize); |
| <span class="attribute">#[cfg(all(tokio_unstable, feature = <span class="string">"tracing"</span>))] |
| </span><span class="self">self</span>.resource_span.in_scope(|| { |
| <span class="macro">tracing::trace!</span>( |
| target: <span class="string">"runtime::resource::state_update"</span>, |
| write_locked = <span class="bool-val">false</span>, |
| write_locked.op = <span class="string">"override"</span>, |
| ) |
| }); |
| <span class="kw">unsafe </span>{ ManuallyDrop::drop(<span class="kw-2">&mut </span><span class="self">self</span>.lock) }; |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tokio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
