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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 `task` mod in crate `futures`."><meta name="keywords" content="rust, rustlang, rust-lang, task"><title>futures::task - 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></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><p class='location'>Module task</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'><a href='../index.html'>futures</a></p><script>window.sidebarCurrent = {name: 'task', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></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"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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='in-band'>Module <a href='../index.html'>futures</a>::<wbr><a class="mod" href=''>task</a></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/futures/task.rs.html#1-46' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>Tasks used to drive a future computation</p>
- <p>It's intended over time a particular operation (such as servicing an HTTP
- request) will involve many futures. This entire operation, however, can be
- thought of as one unit, as the entire result is essentially just moving
- through one large state machine.</p>
- <p>A "task" is the unit of abstraction for what is driving this state machine
- and tree of futures forward. A task is used to poll futures and schedule
- futures with, and has utilities for sharing data between tasks and handles
- for notifying when a future is ready. Each task also has its own set of
- task-local data generated by <code>task_local!</code>.</p>
- <p>Note that libraries typically should not manage tasks themselves, but rather
- leave that to event loops and other "executors" (see the <code>executor</code> module),
- or by using the <code>wait</code> method to create and execute a task directly on the
- current thread.</p>
- <p>More information about the task model can be found <a href="https://tokio.rs/docs/going-deeper-futures/futures-model/">online at tokio.rs</a>.</p>
- <h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
- <p>There is an important bare function in this module: <code>current</code>. The
- <code>current</code> function returns a handle to the currently running task, panicking
- if one isn't present. This handle is then used to later notify the task that
- it's ready to make progress through the <code>Task::notify</code> method.</p>
- </div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.AtomicTask.html"
- title='struct futures::task::AtomicTask'>AtomicTask</a></td>
- <td class='docblock-short'>
- <p>A synchronization primitive for task notification.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.LocalKey.html"
- title='struct futures::task::LocalKey'>LocalKey</a></td>
- <td class='docblock-short'>
- <p>A key for task-local data stored in a future's task.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.Task.html"
- title='struct futures::task::Task'>Task</a></td>
- <td class='docblock-short'>
- <p>A handle to a "task", which represents a single lightweight "thread" of
- execution driving a future to completion.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="struct" href="struct.UnparkEvent.html"
- title='struct futures::task::UnparkEvent'>UnparkEvent</a></td>
- <td class='docblock-short'>
- [<div class='stab deprecated'>Deprecated</div>] <p>A set insertion to trigger upon <code>unpark</code>.</p>
- </td>
- </tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="trait" href="trait.EventSet.html"
- title='trait futures::task::EventSet'>EventSet</a></td>
- <td class='docblock-short'>
- [<div class='stab deprecated'>Deprecated</div>] <p>A concurrent set which allows for the insertion of <code>usize</code> values.</p>
- </td>
- </tr></table><h2 id='functions-1' class='section-header'><a href="#functions-1">Functions</a></h2>
- <table>
- <tr class=' module-item'>
- <td><a class="fn" href="fn.current.html"
- title='fn futures::task::current'>current</a></td>
- <td class='docblock-short'>
- <p>Returns a handle to the current task to call <code>notify</code> at a later date.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="fn" href="fn.init.html"
- title='fn futures::task::init'>init</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td>
- <td class='docblock-short'>
- <p>Initialize the <code>futures</code> task system.</p>
- </td>
- </tr>
- <tr class=' module-item'>
- <td><a class="fn" href="fn.with_unpark_event.html"
- title='fn futures::task::with_unpark_event'>with_unpark_event</a></td>
- <td class='docblock-short'>
- [<div class='stab deprecated'>Deprecated</div>] <p>For the duration of the given callback, add an "unpark event" to be
- triggered when the task handle is used to unpark the task.</p>
- </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 = "futures";</script><script src="../../aliases.js"></script><script src="../../main.js"></script><script defer src="../../search-index.js"></script></body></html>
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