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<h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a>::<wbr><a class="fn" href=''>with_unpark_event</a></span><span class='out-of-band'><span id='render-detail'>
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               </span><a class='srclink' href='../../src/futures/task_impl/std/mod.rs.html#596-609' title='goto source code'>[src]</a></span></h1>
<pre class='rust fn'>pub fn with_unpark_event&lt;F, R&gt;(event: <a class="struct" href="../../futures/task/struct.UnparkEvent.html" title="struct futures::task::UnparkEvent">UnparkEvent</a>, f: F) -&gt; R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -&gt; R,&nbsp;</span></pre><div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>FuturesUnordered</code> instead</p>
</div></div><div class='docblock'><p>For the duration of the given callback, add an &quot;unpark event&quot; to be
triggered when the task handle is used to unpark the task.</p>
<p>Unpark events are used to pass information about what event caused a task to
be unparked. In some cases, tasks are waiting on a large number of possible
events, and need precise information about the wakeup to avoid extraneous
polling.</p>
<p>Every <code>Task</code> handle comes with a set of unpark events which will fire when
<code>unpark</code> is called. When fired, these events insert an identifier into a
concurrent set, which the task can read from to determine what events
occurred.</p>
<p>This function immediately invokes the closure, <code>f</code>, but arranges things so
that <code>task::park</code> will produce a <code>Task</code> handle that includes the given
unpark event.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>This function will panic if a task is not currently being executed. That
is, this method can be dangerous to call outside of an implementation of
<code>poll</code>.</p>
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