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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Consumes a unit of budget and returns the execution back to the Tokio runtime if the task’s coop budget was exhausted."><title>consume_budget in tokio::task - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../tokio/index.html">tokio</a><span class="version">1.42.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">consume_<wbr>budget</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In tokio::<wbr>task</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">tokio</a>::<wbr><a href="index.html">task</a></span><h1>Function <span class="fn">consume_budget</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/tokio/task/consume_budget.rs.html#27-41">Source</a> </span></div><pre class="rust item-decl"><code>pub async fn consume_budget()</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Consumes a unit of budget and returns the execution back to the Tokio
runtime <em>if</em> the task’s coop budget was exhausted.</p>
<p>The task will only yield if its entire coop budget has been exhausted.
This function can be used in order to insert optional yield points into long
computations that do not use Tokio resources like sockets or semaphores,
without redundantly yielding to the runtime each time.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<p>Make sure that a function which returns a sum of (potentially lots of)
iterated values is cooperative.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">async fn </span>sum_iterator(input: <span class="kw-2">&amp;mut </span><span class="kw">impl </span>std::iter::Iterator&lt;Item=i64&gt;) -&gt; i64 {
<span class="kw">let </span><span class="kw-2">mut </span>sum: i64 = <span class="number">0</span>;
<span class="kw">while let </span><span class="prelude-val">Some</span>(i) = input.next() {
sum += i;
tokio::task::consume_budget().<span class="kw">await
</span>}
sum
}</code></pre></div>
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