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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="A runtime for writing reliable network applications without compromising speed."><meta name="keywords" content="rust, rustlang, rust-lang, tokio"><title>tokio - 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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><h2 class="location">Crate tokio</h2><div class="block version"><div class="narrow-helper"></div><p>Version 1.17.0</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all tokio's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#macros">Macros</a></li><li><a href="#functions">Functions</a></li></ul></div><div id="sidebar-vars" data-name="tokio" data-ty="mod" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../tokio/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="#">tokio</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></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/tokio/lib.rs.html#1-537" title="goto source code">[src]</a></span></h1><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A runtime for writing reliable network applications without compromising speed.</p>
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<p>Tokio is an event-driven, non-blocking I/O platform for writing asynchronous
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applications with the Rust programming language. At a high level, it
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provides a few major components:</p>
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<ul>
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<li>Tools for <a href="#working-with-tasks">working with asynchronous tasks</a>, including
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<a href="crate::sync">synchronization primitives and channels</a> and <a href="crate::time">timeouts, sleeps, and
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intervals</a>.</li>
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<li>APIs for <a href="#asynchronous-io">performing asynchronous I/O</a>, including <a href="net/index.html">TCP and UDP</a> sockets,
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<a href="crate::fs">filesystem</a> operations, and <a href="crate::process">process</a> and <a href="crate::signal">signal</a> management.</li>
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<li>A <a href="runtime/index.html">runtime</a> for executing asynchronous code, including a task scheduler,
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an I/O driver backed by the operating system’s event queue (epoll, kqueue,
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IOCP, etc…), and a high performance timer.</li>
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</ul>
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<p>Guide level documentation is found on the <a href="https://tokio.rs/tokio/tutorial">website</a>.</p>
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<h2 id="a-tour-of-tokio" class="section-header"><a href="#a-tour-of-tokio">A Tour of Tokio</a></h2>
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<p>Tokio consists of a number of modules that provide a range of functionality
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essential for implementing asynchronous applications in Rust. In this
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section, we will take a brief tour of Tokio, summarizing the major APIs and
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their uses.</p>
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<p>The easiest way to get started is to enable all features. Do this by
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enabling the <code>full</code> feature flag:</p>
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<div class="example-wrap"><pre class="language-toml"><code>tokio = { version = "1", features = ["full"] }</code></pre></div><h4 id="authoring-applications" class="section-header"><a href="#authoring-applications">Authoring applications</a></h4>
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<p>Tokio is great for writing applications and most users in this case shouldn’t
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worry too much about what features they should pick. If you’re unsure, we suggest
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going with <code>full</code> to ensure that you don’t run into any road blocks while you’re
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building your application.</p>
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<h5 id="example" class="section-header"><a href="#example">Example</a></h5>
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<p>This example shows the quickest way to get started with Tokio.</p>
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<div class="example-wrap"><pre class="language-toml"><code>tokio = { version = "1", features = ["full"] }</code></pre></div><h4 id="authoring-libraries" class="section-header"><a href="#authoring-libraries">Authoring libraries</a></h4>
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<p>As a library author your goal should be to provide the lightest weight crate
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that is based on Tokio. To achieve this you should ensure that you only enable
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the features you need. This allows users to pick up your crate without having
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to enable unnecessary features.</p>
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<h5 id="example-1" class="section-header"><a href="#example-1">Example</a></h5>
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<p>This example shows how you may want to import features for a library that just
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needs to <code>tokio::spawn</code> and use a <code>TcpStream</code>.</p>
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<div class="example-wrap"><pre class="language-toml"><code>tokio = { version = "1", features = ["rt", "net"] }</code></pre></div><h3 id="working-with-tasks" class="section-header"><a href="#working-with-tasks">Working With Tasks</a></h3>
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<p>Asynchronous programs in Rust are based around lightweight, non-blocking
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units of execution called <a href="#working-with-tasks"><em>tasks</em></a>. The <a href="task/index.html"><code>tokio::task</code></a> module provides
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important tools for working with tasks:</p>
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<ul>
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<li>The <a href="task/fn.spawn.html"><code>spawn</code></a> function and <a href="task/struct.JoinHandle.html"><code>JoinHandle</code></a> type, for scheduling a new task
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on the Tokio runtime and awaiting the output of a spawned task, respectively,</li>
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<li>Functions for <a href="task/index.html#blocking-and-yielding">running blocking operations</a> in an asynchronous
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task context.</li>
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</ul>
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<p>The <a href="task/index.html"><code>tokio::task</code></a> module is present only when the “rt” feature flag
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is enabled.</p>
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<p>The <a href="crate::sync"><code>tokio::sync</code></a> module contains synchronization primitives to use when
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needing to communicate or share data. These include:</p>
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<ul>
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<li>channels (<a href="crate::sync::oneshot"><code>oneshot</code></a>, <a href="crate::sync::mpsc"><code>mpsc</code></a>, and <a href="crate::sync::watch"><code>watch</code></a>), for sending values
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between tasks,</li>
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<li>a non-blocking <a href="crate::sync::Mutex"><code>Mutex</code></a>, for controlling access to a shared, mutable
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value,</li>
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<li>an asynchronous <a href="crate::sync::Barrier"><code>Barrier</code></a> type, for multiple tasks to synchronize before
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beginning a computation.</li>
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</ul>
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<p>The <code>tokio::sync</code> module is present only when the “sync” feature flag is
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enabled.</p>
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<p>The <a href="crate::time"><code>tokio::time</code></a> module provides utilities for tracking time and
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scheduling work. This includes functions for setting <a href="crate::time::timeout()">timeouts</a> for
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tasks, <a href="crate::time::sleep()">sleeping</a> work to run in the future, or <a href="crate::time::interval()">repeating an operation at an
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interval</a>.</p>
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<p>In order to use <code>tokio::time</code>, the “time” feature flag must be enabled.</p>
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<p>Finally, Tokio provides a <em>runtime</em> for executing asynchronous tasks. Most
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applications can use the <a href="attr.main.html"><code>#[tokio::main]</code></a> macro to run their code on the
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Tokio runtime. However, this macro provides only basic configuration options. As
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an alternative, the <a href="runtime/index.html"><code>tokio::runtime</code></a> module provides more powerful APIs for configuring
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and managing runtimes. You should use that module if the <code>#[tokio::main]</code> macro doesn’t
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provide the functionality you need.</p>
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<p>Using the runtime requires the “rt” or “rt-multi-thread” feature flags, to
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enable the basic <a href="runtime/index.html#current-thread-scheduler">single-threaded scheduler</a> and the <a href="runtime/index.html#multi-thread-scheduler">thread-pool
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scheduler</a>, respectively. See the <a href="runtime/index.html#runtime-scheduler"><code>runtime</code> module
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documentation</a> for details. In addition, the “macros” feature
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flag enables the <code>#[tokio::main]</code> and <code>#[tokio::test]</code> attributes.</p>
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<h3 id="cpu-bound-tasks-and-blocking-code" class="section-header"><a href="#cpu-bound-tasks-and-blocking-code">CPU-bound tasks and blocking code</a></h3>
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<p>Tokio is able to concurrently run many tasks on a few threads by repeatedly
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swapping the currently running task on each thread. However, this kind of
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swapping can only happen at <code>.await</code> points, so code that spends a long time
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without reaching an <code>.await</code> will prevent other tasks from running. To
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combat this, Tokio provides two kinds of threads: Core threads and blocking
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threads. The core threads are where all asynchronous code runs, and Tokio
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will by default spawn one for each CPU core. The blocking threads are
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spawned on demand, can be used to run blocking code that would otherwise
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block other tasks from running and are kept alive when not used for a certain
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amount of time which can be configured with <a href="runtime/struct.Builder.html#method.thread_keep_alive"><code>thread_keep_alive</code></a>.
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Since it is not possible for Tokio to swap out blocking tasks, like it
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can do with asynchronous code, the upper limit on the number of blocking
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threads is very large. These limits can be configured on the <a href="runtime/struct.Builder.html"><code>Builder</code></a>.</p>
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<p>To spawn a blocking task, you should use the <a href="task/fn.spawn_blocking.html"><code>spawn_blocking</code></a> function.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attribute">#[<span class="ident">tokio::main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="comment">// This is running on a core thread.</span>
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<span class="kw">let</span> <span class="ident">blocking_task</span> <span class="op">=</span> <span class="ident">tokio::task::spawn_blocking</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="comment">// This is running on a blocking thread.</span>
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<span class="comment">// Blocking here is ok.</span>
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});
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<span class="comment">// We can wait for the blocking task like this:</span>
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<span class="comment">// If the blocking task panics, the unwrap below will propagate the</span>
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<span class="comment">// panic.</span>
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<span class="ident">blocking_task</span>.<span class="kw">await</span>.<span class="ident">unwrap</span>();
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}</code></pre></div>
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<p>If your code is CPU-bound and you wish to limit the number of threads used
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to run it, you should use a separate thread pool dedicated to CPU bound tasks.
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For example, you could consider using the <a href="https://docs.rs/rayon">rayon</a> library for CPU-bound
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tasks. It is also possible to create an extra Tokio runtime dedicated to
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CPU-bound tasks, but if you do this, you should be careful that the extra
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runtime runs <em>only</em> CPU-bound tasks, as IO-bound tasks on that runtime
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will behave poorly.</p>
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<p>Hint: If using rayon, you can use a <a href="crate::sync::oneshot"><code>oneshot</code></a> channel to send the result back
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to Tokio when the rayon task finishes.</p>
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<h3 id="asynchronous-io" class="section-header"><a href="#asynchronous-io">Asynchronous IO</a></h3>
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<p>As well as scheduling and running tasks, Tokio provides everything you need
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to perform input and output asynchronously.</p>
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<p>The <a href="io/index.html"><code>tokio::io</code></a> module provides Tokio’s asynchronous core I/O primitives,
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the <a href="io/trait.AsyncRead.html"><code>AsyncRead</code></a>, <a href="io/trait.AsyncWrite.html"><code>AsyncWrite</code></a>, and <a href="io/trait.AsyncBufRead.html"><code>AsyncBufRead</code></a> traits. In addition,
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when the “io-util” feature flag is enabled, it also provides combinators and
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functions for working with these traits, forming as an asynchronous
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counterpart to <a href="https://doc.rust-lang.org/1.59.0/std/io/index.html"><code>std::io</code></a>.</p>
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<p>Tokio also includes APIs for performing various kinds of I/O and interacting
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with the operating system asynchronously. These include:</p>
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<ul>
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<li><a href="net/index.html"><code>tokio::net</code></a>, which contains non-blocking versions of <a href="crate::net::tcp">TCP</a>, <a href="crate::net::UdpSocket">UDP</a>, and
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<a href="crate::net::unix">Unix Domain Sockets</a> (enabled by the “net” feature flag),</li>
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<li><a href="crate::fs"><code>tokio::fs</code></a>, similar to <a href="https://doc.rust-lang.org/1.59.0/std/fs/index.html"><code>std::fs</code></a> but for performing filesystem I/O
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asynchronously (enabled by the “fs” feature flag),</li>
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<li><a href="crate::signal"><code>tokio::signal</code></a>, for asynchronously handling Unix and Windows OS signals
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(enabled by the “signal” feature flag),</li>
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<li><a href="crate::process"><code>tokio::process</code></a>, for spawning and managing child processes (enabled by
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the “process” feature flag).</li>
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</ul>
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<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
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<p>A simple TCP echo server:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">tokio::net::TcpListener</span>;
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<span class="kw">use</span> <span class="ident">tokio::io</span>::{<span class="ident">AsyncReadExt</span>, <span class="ident">AsyncWriteExt</span>};
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<span class="attribute">#[<span class="ident">tokio::main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">std::error::Error</span><span class="op">></span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">listener</span> <span class="op">=</span> <span class="ident">TcpListener::bind</span>(<span class="string">"127.0.0.1:8080"</span>).<span class="kw">await</span><span class="question-mark">?</span>;
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<span class="kw">loop</span> {
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<span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">socket</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">listener</span>.<span class="ident">accept</span>().<span class="kw">await</span><span class="question-mark">?</span>;
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<span class="ident">tokio::spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">1024</span>];
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<span class="comment">// In a loop, read data from the socket and write the data back.</span>
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<span class="kw">loop</span> {
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<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">socket</span>.<span class="ident">read</span>(<span class="kw-2">&mut</span> <span class="ident">buf</span>).<span class="kw">await</span> {
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<span class="comment">// socket closed</span>
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<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> => <span class="kw">return</span>,
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<span class="prelude-val">Ok</span>(<span class="ident">n</span>) => <span class="ident">n</span>,
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<span class="prelude-val">Err</span>(<span class="ident">e</span>) => {
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<span class="macro">eprintln!</span>(<span class="string">"failed to read from socket; err = {:?}"</span>, <span class="ident">e</span>);
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<span class="kw">return</span>;
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}
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};
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<span class="comment">// Write the data back</span>
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=</span> <span class="ident">socket</span>.<span class="ident">write_all</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="number">0</span>..<span class="ident">n</span>]).<span class="kw">await</span> {
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<span class="macro">eprintln!</span>(<span class="string">"failed to write to socket; err = {:?}"</span>, <span class="ident">e</span>);
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<span class="kw">return</span>;
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}
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}
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});
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}
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}</code></pre></div>
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<h3 id="feature-flags" class="section-header"><a href="#feature-flags">Feature flags</a></h3>
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<p>Tokio uses a set of <a href="https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section">feature flags</a> to reduce the amount of compiled code. It
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is possible to just enable certain features over others. By default, Tokio
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does not enable any features but allows one to enable a subset for their use
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case. Below is a list of the available feature flags. You may also notice
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above each function, struct and trait there is listed one or more feature flags
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that are required for that item to be used. If you are new to Tokio it is
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recommended that you use the <code>full</code> feature flag which will enable all public APIs.
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Beware though that this will pull in many extra dependencies that you may not
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need.</p>
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<ul>
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<li><code>full</code>: Enables all features listed below except <code>test-util</code> and <code>tracing</code>.</li>
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<li><code>rt</code>: Enables <code>tokio::spawn</code>, the basic (current thread) scheduler,
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and non-scheduler utilities.</li>
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<li><code>rt-multi-thread</code>: Enables the heavier, multi-threaded, work-stealing scheduler.</li>
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<li><code>io-util</code>: Enables the IO based <code>Ext</code> traits.</li>
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<li><code>io-std</code>: Enable <code>Stdout</code>, <code>Stdin</code> and <code>Stderr</code> types.</li>
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<li><code>net</code>: Enables <code>tokio::net</code> types such as <code>TcpStream</code>, <code>UnixStream</code> and
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<code>UdpSocket</code>, as well as (on Unix-like systems) <code>AsyncFd</code> and (on
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FreeBSD) <code>PollAio</code>.</li>
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<li><code>time</code>: Enables <code>tokio::time</code> types and allows the schedulers to enable
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the built in timer.</li>
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<li><code>process</code>: Enables <code>tokio::process</code> types.</li>
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<li><code>macros</code>: Enables <code>#[tokio::main]</code> and <code>#[tokio::test]</code> macros.</li>
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<li><code>sync</code>: Enables all <code>tokio::sync</code> types.</li>
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<li><code>signal</code>: Enables all <code>tokio::signal</code> types.</li>
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<li><code>fs</code>: Enables <code>tokio::fs</code> types.</li>
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<li><code>test-util</code>: Enables testing based infrastructure for the Tokio runtime.</li>
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</ul>
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<p><em>Note: <code>AsyncRead</code> and <code>AsyncWrite</code> traits do not require any features and are
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always available.</em></p>
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<h4 id="internal-features" class="section-header"><a href="#internal-features">Internal features</a></h4>
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<p>These features do not expose any new API, but influence internal
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implementation aspects of Tokio, and can pull in additional
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dependencies.</p>
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<ul>
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<li><code>parking_lot</code>: As a potential optimization, use the <em>parking_lot</em> crate’s
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synchronization primitives internally. MSRV may increase according to the
|
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<em>parking_lot</em> release in use.</li>
|
||
</ul>
|
||
<h4 id="unstable-features" class="section-header"><a href="#unstable-features">Unstable features</a></h4>
|
||
<p>These feature flags enable <strong>unstable</strong> features. The public API may break in 1.x
|
||
releases. To enable these features, the <code>--cfg tokio_unstable</code> must be passed to
|
||
<code>rustc</code> when compiling. This is easiest done using the <code>RUSTFLAGS</code> env variable:
|
||
<code>RUSTFLAGS="--cfg tokio_unstable"</code>.</p>
|
||
<ul>
|
||
<li><code>tracing</code>: Enables tracing events.</li>
|
||
</ul>
|
||
</div></details><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2>
|
||
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="mod" href="io/index.html" title="tokio::io mod">io</a></div><div class="item-right docblock-short"><p>Traits, helpers, and type definitions for asynchronous I/O functionality.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="net/index.html" title="tokio::net mod">net</a></div><div class="item-right docblock-short"><p>TCP/UDP/Unix bindings for <code>tokio</code>.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="runtime/index.html" title="tokio::runtime mod">runtime</a></div><div class="item-right docblock-short"><p>The Tokio runtime.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="stream/index.html" title="tokio::stream mod">stream</a></div><div class="item-right docblock-short"><p>Due to the <code>Stream</code> trait’s inclusion in <code>std</code> landing later than Tokio’s 1.0
|
||
release, most of the Tokio stream utilities have been moved into the <a href="https://docs.rs/tokio-stream"><code>tokio-stream</code></a>
|
||
crate.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="mod" href="task/index.html" title="tokio::task mod">task</a></div><div class="item-right docblock-short"><p>Asynchronous green-threads.</p>
|
||
</div></div></div><h2 id="macros" class="small-section-header"><a href="#macros">Macros</a></h2>
|
||
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.join.html" title="tokio::join macro">join</a></div><div class="item-right docblock-short"><p>Waits on multiple concurrent branches, returning when <strong>all</strong> branches
|
||
complete.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.pin.html" title="tokio::pin macro">pin</a></div><div class="item-right docblock-short"><p>Pins a value on the stack.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.select.html" title="tokio::select macro">select</a></div><div class="item-right docblock-short"><p>Waits on multiple concurrent branches, returning when the <strong>first</strong> branch
|
||
completes, cancelling the remaining branches.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.task_local.html" title="tokio::task_local macro">task_local</a></div><div class="item-right docblock-short"><p>Declares a new task-local key of type <a href="task/struct.LocalKey.html"><code>tokio::task::LocalKey</code></a>.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="macro" href="macro.try_join.html" title="tokio::try_join macro">try_join</a></div><div class="item-right docblock-short"><p>Waits on multiple concurrent branches, returning when <strong>all</strong> branches
|
||
complete with <code>Ok(_)</code> or on the first <code>Err(_)</code>.</p>
|
||
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2>
|
||
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.spawn.html" title="tokio::spawn fn">spawn</a></div><div class="item-right docblock-short"><p>Spawns a new asynchronous task, returning a
|
||
<a href="task/struct.JoinHandle.html"><code>JoinHandle</code></a> for it.</p>
|
||
</div></div></div><h2 id="attributes" class="small-section-header"><a href="#attributes">Attribute Macros</a></h2>
|
||
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="attr" href="attr.main.html" title="tokio::main attr">main</a></div><div class="item-right docblock-short"><p>Marks async function to be executed by the selected runtime. This macro
|
||
helps set up a <code>Runtime</code> without requiring the user to use
|
||
<a href="../tokio/runtime/struct.Runtime.html">Runtime</a> or
|
||
<a href="../tokio/runtime/struct.Builder.html">Builder</a> directly.</p>
|
||
</div></div><div class="item-row"><div class="item-left module-item"><a class="attr" href="attr.test.html" title="tokio::test attr">test</a></div><div class="item-right docblock-short"><p>Marks async function to be executed by runtime, suitable to test environment</p>
|
||
</div></div></div></section><section id="search" class="content hidden"></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="1.59.0 (9d1b2106e 2022-02-23)" ></div>
|
||
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