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<meta name="description" content="API documentation for the Rust `AtomicTask` struct in crate `futures`.">
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<title>futures::task::AtomicTask - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Struct AtomicTask</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.register">register</a><a href="#method.register_task">register_task</a><a href="#method.notify">notify</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Default">Default</a><a href="#impl-Debug">Debug</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a></p><script>window.sidebarCurrent = {name: 'AtomicTask', ty: 'struct', 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'>Struct <a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a>::<wbr><a class="struct" href=''>AtomicTask</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#27-30' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct AtomicTask { /* fields omitted */ }</pre><div class='docblock'><p>A synchronization primitive for task notification.</p>
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<p><code>AtomicTask</code> will coordinate concurrent notifications with the consumer
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potentially "updating" the underlying task to notify. This is useful in
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scenarios where a computation completes in another thread and wants to
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notify the consumer, but the consumer is in the process of being migrated to
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a new logical task.</p>
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<p>Consumers should call <code>register</code> before checking the result of a computation
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and producers should call <code>notify</code> after producing the computation (this
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differs from the usual <code>thread::park</code> pattern). It is also permitted for
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<code>notify</code> to be called <strong>before</strong> <code>register</code>. This results in a no-op.</p>
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<p>A single <code>AtomicTask</code> may be reused for any number of calls to <code>register</code> or
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<code>notify</code>.</p>
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<p><code>AtomicTask</code> does not provide any memory ordering guarantees, as such the
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user should use caution and use other synchronization primitives to guard
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the result of the underlying computation.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#137-279' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#139-148' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create an <code>AtomicTask</code> initialized with the given <code>Task</code></p>
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</div><h4 id='method.register' class="method"><span id='register.v' class='invisible'><code>pub fn <a href='#method.register' class='fnname'>register</a>(&self)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#153-155' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Registers the current task to be notified on calls to <code>notify</code>.</p>
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<p>This is the same as calling <code>register_task</code> with <code>task::current()</code>.</p>
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</div><h4 id='method.register_task' class="method"><span id='register_task.v' class='invisible'><code>pub fn <a href='#method.register_task' class='fnname'>register_task</a>(&self, task: <a class="struct" href="../../futures/task/struct.Task.html" title="struct futures::task::Task">Task</a>)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#172-243' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Registers the provided task to be notified on calls to <code>notify</code>.</p>
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<p>The new task will take place of any previous tasks that were registered
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by previous calls to <code>register</code>. Any calls to <code>notify</code> that happen after
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a call to <code>register</code> (as defined by the memory ordering rules), will
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notify the <code>register</code> caller's task.</p>
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<p>It is safe to call <code>register</code> with multiple other threads concurrently
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calling <code>notify</code>. This will result in the <code>register</code> caller's current
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task being notified once.</p>
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<p>This function is safe to call concurrently, but this is generally a bad
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idea. Concurrent calls to <code>register</code> will attempt to register different
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tasks to be notified. One of the callers will win and have its task set,
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but there is no guarantee as to which caller will succeed.</p>
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</div><h4 id='method.notify' class="method"><span id='notify.v' class='invisible'><code>pub fn <a href='#method.notify' class='fnname'>notify</a>(&self)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#248-278' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Notifies the task that last called <code>register</code>.</p>
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<p>If <code>register</code> has not been called yet, then this does nothing.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-Default' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code><a href='#impl-Default' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#281-285' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#282-284' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#287-291' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, fmt: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#288-290' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Send' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code><a href='#impl-Send' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#293' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../futures/task/struct.AtomicTask.html" title="struct futures::task::AtomicTask">AtomicTask</a></code><a href='#impl-Sync' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/futures/task_impl/atomic_task.rs.html#294' title='goto source code'>[src]</a></span></h3>
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