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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="API documentation for the Rust `mio` crate."><meta name="keywords" content="rust, rustlang, rust-lang, mio"><title>mio - Rust</title><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="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../mio/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Crate mio</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all mio's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'mio', ty: 'mod', relpath: '../'};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><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><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><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/mio/lib.rs.html#1-311' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>mio</a></span></h1><div class='docblock'><p>A fast, low-level IO library for Rust focusing on non-blocking APIs, event
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notification, and other useful utilities for building high performance IO
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apps.</p>
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<h1 id="features" class="section-header"><a href="#features">Features</a></h1>
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<ul>
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<li>Non-blocking TCP, UDP</li>
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<li>I/O event notification queue backed by epoll, kqueue, and IOCP</li>
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<li>Zero allocations at runtime</li>
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<li>Platform specific extensions</li>
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</ul>
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<h1 id="non-goals" class="section-header"><a href="#non-goals">Non-goals</a></h1>
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<p>The following are specifically omitted from Mio and are left to the user or higher-level libraries.</p>
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<ul>
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<li>File operations</li>
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<li>Thread pools / multi-threaded event loop</li>
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<li>Timers</li>
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</ul>
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<h1 id="platforms" class="section-header"><a href="#platforms">Platforms</a></h1>
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<p>Currently supported platforms:</p>
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<ul>
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<li>Linux</li>
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<li>OS X</li>
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<li>Windows</li>
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<li>FreeBSD</li>
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<li>NetBSD</li>
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<li>Android</li>
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<li>iOS</li>
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</ul>
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<p>mio can handle interfacing with each of the event notification systems of the aforementioned platforms. The details of
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their implementation are further discussed in <a href="struct.Poll.html"><code>Poll</code></a>.</p>
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<h1 id="usage" class="section-header"><a href="#usage">Usage</a></h1>
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<p>Using mio starts by creating a <a href="struct.Poll.html"><code>Poll</code></a>, which reads events from the OS and
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put them into <a href="struct.Events.html"><code>Events</code></a>. You can handle IO events from the OS with it.</p>
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<p>For more detail, see <a href="struct.Poll.html"><code>Poll</code></a>.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">mio</span>::<span class="kw-2">*</span>;
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<span class="kw">use</span> <span class="ident">mio</span>::<span class="ident">net</span>::{<span class="ident">TcpListener</span>, <span class="ident">TcpStream</span>};
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<span class="comment">// Setup some tokens to allow us to identify which event is</span>
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<span class="comment">// for which socket.</span>
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<span class="kw">const</span> <span class="ident">SERVER</span>: <span class="ident">Token</span> <span class="op">=</span> <span class="ident">Token</span>(<span class="number">0</span>);
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<span class="kw">const</span> <span class="ident">CLIENT</span>: <span class="ident">Token</span> <span class="op">=</span> <span class="ident">Token</span>(<span class="number">1</span>);
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<span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="string">"127.0.0.1:13265"</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>();
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<span class="comment">// Setup the server socket</span>
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<span class="kw">let</span> <span class="ident">server</span> <span class="op">=</span> <span class="ident">TcpListener</span>::<span class="ident">bind</span>(<span class="kw-2">&</span><span class="ident">addr</span>).<span class="ident">unwrap</span>();
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<span class="comment">// Create a poll instance</span>
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<span class="kw">let</span> <span class="ident">poll</span> <span class="op">=</span> <span class="ident">Poll</span>::<span class="ident">new</span>().<span class="ident">unwrap</span>();
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<span class="comment">// Start listening for incoming connections</span>
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<span class="ident">poll</span>.<span class="ident">register</span>(<span class="kw-2">&</span><span class="ident">server</span>, <span class="ident">SERVER</span>, <span class="ident">Ready</span>::<span class="ident">readable</span>(),
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<span class="ident">PollOpt</span>::<span class="ident">edge</span>()).<span class="ident">unwrap</span>();
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<span class="comment">// Setup the client socket</span>
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<span class="kw">let</span> <span class="ident">sock</span> <span class="op">=</span> <span class="ident">TcpStream</span>::<span class="ident">connect</span>(<span class="kw-2">&</span><span class="ident">addr</span>).<span class="ident">unwrap</span>();
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<span class="comment">// Register the socket</span>
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<span class="ident">poll</span>.<span class="ident">register</span>(<span class="kw-2">&</span><span class="ident">sock</span>, <span class="ident">CLIENT</span>, <span class="ident">Ready</span>::<span class="ident">readable</span>(),
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<span class="ident">PollOpt</span>::<span class="ident">edge</span>()).<span class="ident">unwrap</span>();
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<span class="comment">// Create storage for events</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">events</span> <span class="op">=</span> <span class="ident">Events</span>::<span class="ident">with_capacity</span>(<span class="number">1024</span>);
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<span class="kw">loop</span> {
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<span class="ident">poll</span>.<span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">events</span>, <span class="prelude-val">None</span>).<span class="ident">unwrap</span>();
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<span class="kw">for</span> <span class="ident">event</span> <span class="kw">in</span> <span class="ident">events</span>.<span class="ident">iter</span>() {
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<span class="kw">match</span> <span class="ident">event</span>.<span class="ident">token</span>() {
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<span class="ident">SERVER</span> <span class="op">=</span><span class="op">></span> {
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<span class="comment">// Accept and drop the socket immediately, this will close</span>
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<span class="comment">// the socket and notify the client of the EOF.</span>
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<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">server</span>.<span class="ident">accept</span>();
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}
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<span class="ident">CLIENT</span> <span class="op">=</span><span class="op">></span> {
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<span class="comment">// The server just shuts down the socket, let's just exit</span>
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<span class="comment">// from our event loop.</span>
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<span class="kw">return</span>;
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}
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<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
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}
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}
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}
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</pre></div>
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</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table><tr class='module-item'><td><a class="mod" href="event/index.html" title='mio::event mod'>event</a></td><td class='docblock-short'><p>Readiness event types and utilities.</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="net/index.html" title='mio::net mod'>net</a></td><td class='docblock-short'><p>Networking primitives</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="unix/index.html" title='mio::unix mod'>unix</a></td><td class='docblock-short'><p>Unix only extensions</p>
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</td></tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.Events.html" title='mio::Events struct'>Events</a></td><td class='docblock-short'><p>A collection of readiness events.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Poll.html" title='mio::Poll struct'>Poll</a></td><td class='docblock-short'><p>Polls for readiness events on all registered values.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.PollOpt.html" title='mio::PollOpt struct'>PollOpt</a></td><td class='docblock-short'><p>Options supplied when registering an <code>Evented</code> handle with <code>Poll</code></p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Ready.html" title='mio::Ready struct'>Ready</a></td><td class='docblock-short'><p>A set of readiness event kinds</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Registration.html" title='mio::Registration struct'>Registration</a></td><td class='docblock-short'><p>Handle to a user space <code>Poll</code> registration.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.SetReadiness.html" title='mio::SetReadiness struct'>SetReadiness</a></td><td class='docblock-short'><p>Updates the readiness state of the associated <code>Registration</code>.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Token.html" title='mio::Token struct'>Token</a></td><td class='docblock-short'><p>Associates readiness notifications with <a href="event/trait.Evented.html"><code>Evented</code></a> handles.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "mio";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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