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<title>tokio - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Crate tokio</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#reexports">Re-exports</a></li><li><a href="#modules">Modules</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'tokio', ty: 'mod', relpath: '../'};</script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>tokio</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/tokio/lib.rs.html#1-235' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>A runtime for writing reliable, asynchronous, and slim applications.</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>A multi threaded, work-stealing based task [scheduler][runtime].</li>
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<li>A [reactor][reactor] backed by the operating system's event queue (epoll, kqueue,
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IOCP, etc...).</li>
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<li>Asynchronous [TCP and UDP][net] sockets.</li>
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<li>Asynchronous [filesystem][fs] operations.</li>
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<li>[Timer][timer] API for scheduling work in the future.</li>
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</ul>
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<p>Tokio is built using <a href="http://docs.rs/futures">futures</a> as the abstraction for managing the
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complexity of asynchronous programming.</p>
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<p>Guide level documentation is found on the <a href="https://tokio.rs/docs/getting-started/hello-world/">website</a>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>A simple TCP echo server:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">tokio</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">io</span>::<span class="ident">copy</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">net</span>::<span class="ident">TcpListener</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="comment">// Bind the server's socket.</span>
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<span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="string">"127.0.0.1:12345"</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">listener</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>)
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.<span class="ident">expect</span>(<span class="string">"unable to bind TCP listener"</span>);
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<span class="comment">// Pull out a stream of sockets for incoming connections</span>
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<span class="kw">let</span> <span class="ident">server</span> <span class="op">=</span> <span class="ident">listener</span>.<span class="ident">incoming</span>()
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.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="macro">eprintln</span><span class="macro">!</span>(<span class="string">"accept failed = {:?}"</span>, <span class="ident">e</span>))
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.<span class="ident">for_each</span>(<span class="op">|</span><span class="ident">sock</span><span class="op">|</span> {
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<span class="comment">// Split up the reading and writing parts of the</span>
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<span class="comment">// socket.</span>
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<span class="kw">let</span> (<span class="ident">reader</span>, <span class="ident">writer</span>) <span class="op">=</span> <span class="ident">sock</span>.<span class="ident">split</span>();
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<span class="comment">// A future that echos the data and returns how</span>
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<span class="comment">// many bytes were copied...</span>
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<span class="kw">let</span> <span class="ident">bytes_copied</span> <span class="op">=</span> <span class="ident">copy</span>(<span class="ident">reader</span>, <span class="ident">writer</span>);
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<span class="comment">// ... after which we'll print what happened.</span>
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<span class="kw">let</span> <span class="ident">handle_conn</span> <span class="op">=</span> <span class="ident">bytes_copied</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">amt</span><span class="op">|</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"wrote {:?} bytes"</span>, <span class="ident">amt</span>)
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}).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
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<span class="macro">eprintln</span><span class="macro">!</span>(<span class="string">"IO error {:?}"</span>, <span class="ident">err</span>)
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});
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<span class="comment">// Spawn the future as a concurrent task.</span>
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<span class="ident">tokio</span>::<span class="ident">spawn</span>(<span class="ident">handle_conn</span>)
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});
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<span class="comment">// Start the Tokio runtime</span>
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<span class="ident">tokio</span>::<span class="ident">run</span>(<span class="ident">server</span>);
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}</pre>
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</div><h2 id='reexports' class='section-header'><a href="#reexports">Re-exports</a></h2>
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<table><tr><td><code>pub use executor::<a class="fn" href="../tokio/executor/fn.spawn.html" title="fn tokio::executor::spawn">spawn</a>;</code></td></tr><tr><td><code>pub use runtime::<a class="fn" href="../tokio/runtime/fn.run.html" title="fn tokio::runtime::run">run</a>;</code></td></tr></table><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="mod" href="clock/index.html"
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title='mod tokio::clock'>clock</a></td>
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<td class='docblock-short'>
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<p>A configurable source of time.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="executor/index.html"
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title='mod tokio::executor'>executor</a></td>
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<td class='docblock-short'>
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<p>Task execution utilities.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="fs/index.html"
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title='mod tokio::fs'>fs</a></td>
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<td class='docblock-short'>
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<p>Asynchronous filesystem manipulation operations.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="io/index.html"
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title='mod tokio::io'>io</a></td>
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<td class='docblock-short'>
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<p>Asynchronous I/O.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="net/index.html"
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title='mod tokio::net'>net</a></td>
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<td class='docblock-short'>
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<p>TCP/UDP bindings for <code>tokio</code>.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="prelude/index.html"
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title='mod tokio::prelude'>prelude</a></td>
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<td class='docblock-short'>
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<p>A "prelude" for users of the <code>tokio</code> crate.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="reactor/index.html"
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title='mod tokio::reactor'>reactor</a></td>
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<td class='docblock-short'>
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<p>Event loop that drives Tokio I/O resources.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="runtime/index.html"
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title='mod tokio::runtime'>runtime</a></td>
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<td class='docblock-short'>
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<p>A batteries included runtime for applications using Tokio.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="timer/index.html"
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title='mod tokio::timer'>timer</a></td>
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<td class='docblock-short'>
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<p>Utilities for tracking time.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="mod" href="util/index.html"
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title='mod tokio::util'>util</a></td>
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<td class='docblock-short'>
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<p>Utilities for working with Tokio.</p>
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</td>
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