| <!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 single-threaded task pool for polling futures to completion."><meta name="keywords" content="rust, rustlang, rust-lang, LocalPool"><title>LocalPool in futures::executor - 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 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class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../futures/index.html"><div 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="../../futures/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">LocalPool</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.new">new</a></li><li><a href="#method.run">run</a></li><li><a href="#method.run_until">run_until</a></li><li><a href="#method.run_until_stalled">run_until_stalled</a></li><li><a href="#method.spawner">spawner</a></li><li><a href="#method.try_run_one">try_run_one</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-Debug-for-LocalPool">Debug</a></li><li><a href="#impl-Default-for-LocalPool">Default</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-LocalPool">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-LocalPool">!Send</a></li><li><a href="#impl-Sync-for-LocalPool">!Sync</a></li><li><a href="#impl-Unpin-for-LocalPool">Unpin</a></li><li><a href="#impl-UnwindSafe-for-LocalPool">!UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-LocalPool">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-LocalPool">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-LocalPool">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-LocalPool">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-LocalPool">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-LocalPool">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-LocalPool">TryInto<U></a></li></ul></section><h2><a href="index.html">In futures::executor</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">futures</a>::<wbr><a href="index.html">executor</a>::<wbr><a class="struct" href="#">LocalPool</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/futures_executor/local_pool.rs.html#31">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 LocalPool { /* 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 single-threaded task pool for polling futures to completion.</p> |
| <p>This executor allows you to multiplex any number of tasks onto a single |
| thread. It’s appropriate to poll strictly I/O-bound futures that do very |
| little work in between I/O actions.</p> |
| <p>To get a handle to the pool that implements |
| <a href="../task/trait.Spawn.html"><code>Spawn</code></a>, use the |
| <a href="struct.LocalPool.html#method.spawner"><code>spawner()</code></a> method. Because the executor is |
| single-threaded, it supports a special form of task spawning for non-<code>Send</code> |
| futures, via <a href="../task/trait.LocalSpawn.html#tymethod.spawn_local_obj"><code>spawn_local_obj</code></a>.</p> |
| </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-LocalPool" class="impl has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#110">source</a><a href="#impl-LocalPool" class="anchor"></a><h3 class="code-header">impl <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></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/futures_executor/local_pool.rs.html#112">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a>() -> <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h4></section></summary><div class="docblock"><p>Create a new, empty pool of tasks.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.spawner" class="method has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#117">source</a><h4 class="code-header">pub fn <a href="#method.spawner" class="fnname">spawner</a>(&self) -> <a class="struct" href="struct.LocalSpawner.html" title="struct futures::executor::LocalSpawner">LocalSpawner</a></h4></section></summary><div class="docblock"><p>Get a clonable handle to the pool as a <a href="../task/trait.Spawn.html" title="Spawn"><code>Spawn</code></a>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.run" class="method has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#136">source</a><h4 class="code-header">pub fn <a href="#method.run" class="fnname">run</a>(&mut self)</h4></section></summary><div class="docblock"><p>Run all tasks in the pool to completion.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::LocalPool; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pool = LocalPool::new(); |
| |
| <span class="comment">// ... spawn some initial tasks using `spawn.spawn()` or `spawn.spawn_local()` |
| |
| // run *all* tasks in the pool to completion, including any newly-spawned ones. |
| </span>pool.run();</code></pre></div> |
| <p>The function will block the calling thread until <em>all</em> tasks in the pool |
| are complete, including any spawned while running existing tasks.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.run_until" class="method has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#157">source</a><h4 class="code-header">pub fn <a href="#method.run_until" class="fnname">run_until</a><F>(&mut self, future: F) -> <F as <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="associatedtype" href="../future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a><span class="where fmt-newline">where<br> F: <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>,</span></h4></section></summary><div class="docblock"><p>Runs all the tasks in the pool until the given future completes.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::LocalPool; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pool = LocalPool::new(); |
| |
| <span class="comment">// run tasks in the pool until `my_app` completes |
| </span>pool.run_until(my_app);</code></pre></div> |
| <p>The function will block the calling thread <em>only</em> until the future <code>f</code> |
| completes; there may still be incomplete tasks in the pool, which will |
| be inert after the call completes, but can continue with further use of |
| one of the pool’s run or poll methods. While the function is running, |
| however, all tasks in the pool will try to make progress.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_run_one" class="method has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#202">source</a><h4 class="code-header">pub fn <a href="#method.try_run_one" class="fnname">try_run_one</a>(&mut self) -> bool</h4></section></summary><div class="docblock"><p>Runs all tasks and returns after completing one future or until no more progress |
| can be made. Returns <code>true</code> if one future was completed, <code>false</code> otherwise.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::LocalPool; |
| <span class="kw">use </span>futures::task::LocalSpawnExt; |
| <span class="kw">use </span>futures::future::{ready, pending}; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pool = LocalPool::new(); |
| <span class="kw">let </span>spawner = pool.spawner(); |
| |
| spawner.spawn_local(ready(())).unwrap(); |
| spawner.spawn_local(ready(())).unwrap(); |
| spawner.spawn_local(pending()).unwrap(); |
| |
| <span class="comment">// Run the two ready tasks and return true for them. |
| </span>pool.try_run_one(); <span class="comment">// returns true after completing one of the ready futures |
| </span>pool.try_run_one(); <span class="comment">// returns true after completing the other ready future |
| |
| // the remaining task can not be completed |
| </span><span class="macro">assert!</span>(!pool.try_run_one()); <span class="comment">// returns false</span></code></pre></div> |
| <p>This function will not block the calling thread and will return the moment |
| that there are no tasks left for which progress can be made or after exactly one |
| task was completed; Remaining incomplete tasks in the pool can continue with |
| further use of one of the pool’s run or poll methods. |
| Though only one task will be completed, progress may be made on multiple tasks.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.run_until_stalled" class="method has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#253">source</a><h4 class="code-header">pub fn <a href="#method.run_until_stalled" class="fnname">run_until_stalled</a>(&mut self)</h4></section></summary><div class="docblock"><p>Runs all tasks in the pool and returns if no more progress can be made |
| on any task.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::LocalPool; |
| <span class="kw">use </span>futures::task::LocalSpawnExt; |
| <span class="kw">use </span>futures::future::{ready, pending}; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>pool = LocalPool::new(); |
| <span class="kw">let </span>spawner = pool.spawner(); |
| |
| spawner.spawn_local(ready(())).unwrap(); |
| spawner.spawn_local(ready(())).unwrap(); |
| spawner.spawn_local(pending()).unwrap(); |
| |
| <span class="comment">// Runs the two ready task and returns. |
| // The empty task remains in the pool. |
| </span>pool.run_until_stalled();</code></pre></div> |
| <p>This function will not block the calling thread and will return the moment |
| that there are no tasks left for which progress can be made; |
| remaining incomplete tasks in the pool can continue with further use of one |
| of the pool’s run or poll methods. While the function is running, all tasks |
| in the pool will try to make progress.</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-LocalPool" class="impl has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#30">source</a><a href="#impl-Debug-for-LocalPool" class="anchor"></a><h3 class="code-header">impl Debug for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></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/futures_executor/local_pool.rs.html#30">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a class="fnname">fmt</a>(&self, f: &mut Formatter<'_>) -> Result<(), Error></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-LocalPool" class="impl has-srclink"><a class="srclink rightside" href="../../src/futures_executor/local_pool.rs.html#303">source</a><a href="#impl-Default-for-LocalPool" class="anchor"></a><h3 class="code-header">impl Default for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></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/futures_executor/local_pool.rs.html#304">source</a><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a class="fnname">default</a>() -> <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a>Read more</a></div></details></div></details></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-LocalPool" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-LocalPool" class="anchor"></a><h3 class="code-header">impl !RefUnwindSafe for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h3></section><section id="impl-Send-for-LocalPool" class="impl has-srclink"><a href="#impl-Send-for-LocalPool" class="anchor"></a><h3 class="code-header">impl !Send for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h3></section><section id="impl-Sync-for-LocalPool" class="impl has-srclink"><a href="#impl-Sync-for-LocalPool" class="anchor"></a><h3 class="code-header">impl !Sync for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h3></section><section id="impl-Unpin-for-LocalPool" class="impl has-srclink"><a href="#impl-Unpin-for-LocalPool" class="anchor"></a><h3 class="code-header">impl Unpin for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></h3></section><section id="impl-UnwindSafe-for-LocalPool" class="impl has-srclink"><a href="#impl-UnwindSafe-for-LocalPool" class="anchor"></a><h3 class="code-header">impl !UnwindSafe for <a class="struct" href="struct.LocalPool.html" title="struct futures::executor::LocalPool">LocalPool</a></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-LocalPool" class="impl has-srclink"><a href="#impl-Any-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-LocalPool" 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-LocalPool" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-LocalPool" 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="futures" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
