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268 lines
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<meta name="description" content="API documentation for the Rust `task` mod in crate `tokio`.">
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<title>tokio::prelude::task - Rust</title>
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<div class="sidebar-menu">☰</div>
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<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'>tokio</a>::<wbr><a href='../index.html'>prelude</a></p><script>window.sidebarCurrent = {name: 'task', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Module <a href='../../index.html'>tokio</a>::<wbr><a href='../index.html'>prelude</a>::<wbr><a class="mod" href=''>task</a></span><span class='out-of-band'><span id='render-detail'>
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</a>
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</span><a class='srclink' href='../../../src/futures/lib.rs.html#206' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>Tasks used to drive a future computation</p>
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<p>It's intended over time a particular operation (such as servicing an HTTP
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request) will involve many futures. This entire operation, however, can be
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thought of as one unit, as the entire result is essentially just moving
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through one large state machine.</p>
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<p>A "task" is the unit of abstraction for what is driving this state machine
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and tree of futures forward. A task is used to poll futures and schedule
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futures with, and has utilities for sharing data between tasks and handles
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for notifying when a future is ready. Each task also has its own set of
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task-local data generated by <code>task_local!</code>.</p>
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<p>Note that libraries typically should not manage tasks themselves, but rather
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leave that to event loops and other "executors" (see the <code>executor</code> module),
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or by using the <code>wait</code> method to create and execute a task directly on the
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current thread.</p>
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<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>
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<h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
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<p>There is an important bare function in this module: <code>current</code>. The
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<code>current</code> function returns a handle to the currently running task, panicking
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if one isn't present. This handle is then used to later notify the task that
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it's ready to make progress through the <code>Task::notify</code> method.</p>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.AtomicTask.html"
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title='struct tokio::prelude::task::AtomicTask'>AtomicTask</a></td>
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<td class='docblock-short'>
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<p>A synchronization primitive for task notification.</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="struct" href="struct.LocalKey.html"
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title='struct tokio::prelude::task::LocalKey'>LocalKey</a></td>
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<td class='docblock-short'>
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<p>A key for task-local data stored in a future's task.</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="struct" href="struct.Run.html"
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title='struct tokio::prelude::task::Run'>Run</a></td>
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<td class='docblock-short'>
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<p>Units of work submitted to an <code>Executor</code>, currently only created
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internally.</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="struct" href="struct.Spawn.html"
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title='struct tokio::prelude::task::Spawn'>Spawn</a></td>
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<td class='docblock-short'>
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<p>Representation of a spawned future/stream.</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="struct" href="struct.Task.html"
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title='struct tokio::prelude::task::Task'>Task</a></td>
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<td class='docblock-short'>
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<p>A handle to a "task", which represents a single lightweight "thread" of
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execution driving a future to completion.</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="struct" href="struct.TaskRc.html"
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title='struct tokio::prelude::task::TaskRc'>TaskRc</a></td>
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<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>A reference to a piece of data that's accessible only within a specific
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<code>Task</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="struct" href="struct.UnparkEvent.html"
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title='struct tokio::prelude::task::UnparkEvent'>UnparkEvent</a></td>
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<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>A set insertion to trigger upon <code>unpark</code>.</p>
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</td>
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</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="trait" href="trait.EventSet.html"
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title='trait tokio::prelude::task::EventSet'>EventSet</a></td>
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<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>A concurrent set which allows for the insertion of <code>usize</code> values.</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="trait" href="trait.Executor.html"
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title='trait tokio::prelude::task::Executor'>Executor</a></td>
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<td class='docblock-short'>
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<p>A trait representing requests to poll futures.</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="trait" href="trait.Unpark.html"
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title='trait tokio::prelude::task::Unpark'>Unpark</a></td>
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<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>A trait which represents a sink of notifications that a future is ready to
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make progress.</p>
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</td>
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</tr></table><h2 id='functions-1' class='section-header'><a href="#functions-1">Functions</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.current.html"
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title='fn tokio::prelude::task::current'>current</a></td>
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<td class='docblock-short'>
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<p>Returns a handle to the current task to call <code>notify</code> at a later date.</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="fn" href="fn.init.html"
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title='fn tokio::prelude::task::init'>init</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td>
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<td class='docblock-short'>
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<p>Initialize the <code>futures</code> task system.</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="fn" href="fn.spawn.html"
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title='fn tokio::prelude::task::spawn'>spawn</a></td>
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<td class='docblock-short'>
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<p>Spawns a future or stream, returning it and the new task responsible for
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running it to completion.</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="fn" href="fn.with_unpark_event.html"
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title='fn tokio::prelude::task::with_unpark_event'>with_unpark_event</a></td>
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<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>For the duration of the given callback, add an "unpark event" to be
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triggered when the task handle is used to unpark the task.</p>
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</td>
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</tr></table></section>
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