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<p class='location'>Trait Notify</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.notify">notify</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.clone_id">clone_id</a><a href="#method.drop_id">drop_id</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>executor</a></p><script>window.sidebarCurrent = {name: 'Notify', ty: 'trait', 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'>Trait <a href='../index.html'>futures</a>::<wbr><a href='index.html'>executor</a>::<wbr><a class="trait" href=''>Notify</a></span><span class='out-of-band'><span id='render-detail'>
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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/mod.rs.html#390-444' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Notify: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> {
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fn <a href='#tymethod.notify' class='fnname'>notify</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>);
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fn <a href='#method.clone_id' class='fnname'>clone_id</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a> { ... }
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<div class='item-spacer'></div> fn <a href='#method.drop_id' class='fnname'>drop_id</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) { ... }
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}</pre><div class='docblock'><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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<p>This trait is provided as an argument to the <code>Spawn::*_notify</code> family of
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functions. It's transitively used as part of the <code>Task::notify</code> method to
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internally deliver notifications of readiness of a future to move forward.</p>
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<p>An instance of <code>Notify</code> has one primary method, <code>notify</code>, which is given a
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contextual argument as to what's being notified. This contextual argument is
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<em>also</em> provided to the <code>Spawn::*_notify</code> family of functions and can be used
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to reuse an instance of <code>Notify</code> across many futures.</p>
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<p>Instances of <code>Notify</code> must be safe to share across threads, and the methods
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be invoked concurrently. They must also live for the <code>'static</code> lifetime,
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not containing any stack references.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.notify' class='method'><span id='notify.v' class='invisible'><code>fn <a href='#tymethod.notify' class='fnname'>notify</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</code></span></h3><div class='docblock'><p>Indicates that an associated future and/or task are ready to make
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progress.</p>
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<p>Typically this means that the receiver of the notification should
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arrange for the future to get poll'd in a prompt fashion.</p>
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<p>This method takes an <code>id</code> as an argument which was transitively passed
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in from the original call to <code>Spawn::*_notify</code>. This id can be used to
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disambiguate which precise future became ready for polling.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>Since <code>unpark</code> may be invoked from arbitrary contexts, it should
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endeavor not to panic and to do as little work as possible. However, it
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is not guaranteed not to panic, and callers should be wary. If a panic
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occurs, that panic may or may not be propagated to the end-user of the
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future that you'd otherwise wake up.</p>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.clone_id' class='method'><span id='clone_id.v' class='invisible'><code>fn <a href='#method.clone_id' class='fnname'>clone_id</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span></h3><div class='docblock'><p>This function is called whenever a new copy of <code>id</code> is needed.</p>
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<p>This is called in one of two situations:</p>
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<ul>
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<li>A <code>Task</code> is being created through <code>task::current</code> while a future is
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being polled. In that case the instance of <code>Notify</code> passed in to one
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of the <code>poll_*</code> functions is called with the <code>id</code> passed into the same
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<code>poll_*</code> function.</li>
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<li>A <code>Task</code> is itself being cloned. Each <code>Task</code> contains its own id and a
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handle to the <code>Notify</code> behind it, and the task's <code>Notify</code> is used to
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clone the internal <code>id</code> to assign to the new task.</li>
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</ul>
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<p>The <code>id</code> returned here will be stored in the <code>Task</code>-to-be and used later
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to pass to <code>notify</code> when the <code>Task::notify</code> function is called on that
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<code>Task</code>.</p>
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<p>Note that typically this is just the identity function, passing through
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the identifier. For more unsafe situations, however, if <code>id</code> is itself a
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pointer of some kind this can be used as a hook to "clone" the pointer,
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depending on what that means for the specified pointer.</p>
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</div><h3 id='method.drop_id' class='method'><span id='drop_id.v' class='invisible'><code>fn <a href='#method.drop_id' class='fnname'>drop_id</a>(&self, id: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</code></span></h3><div class='docblock'><p>All instances of <code>Task</code> store an <code>id</code> that they're going to internally
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notify with, and this function is called when the <code>Task</code> is dropped.</p>
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<p>This function provides a hook for schemes which encode pointers in this
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<code>id</code> argument to deallocate resources associated with the pointer. It's
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guaranteed that after this function is called the <code>Task</code> containing this
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<code>id</code> will no longer use the <code>id</code>.</p>
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</div></div>
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<h2 id='implementors' class='small-section-header'>
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Implementors<a href='#implementors' class='anchor'></a>
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</h2>
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