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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>
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<pre class='rust fn'>pub fn with_unpark_event<F, R>(event: <a class="struct" href="../../futures/task/struct.UnparkEvent.html" title="struct futures::task::UnparkEvent">UnparkEvent</a>, f: F) -> R <span class="where fmt-newline">where<br> 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>() -> R, </span></pre><div class='stability'><div class='stab deprecated'>Deprecated<p>: recommended to use <code>FuturesUnordered</code> instead</p>
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</div></div><div class='docblock'><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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<p>Unpark events are used to pass information about what event caused a task to
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be unparked. In some cases, tasks are waiting on a large number of possible
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events, and need precise information about the wakeup to avoid extraneous
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polling.</p>
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<p>Every <code>Task</code> handle comes with a set of unpark events which will fire when
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<code>unpark</code> is called. When fired, these events insert an identifier into a
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concurrent set, which the task can read from to determine what events
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occurred.</p>
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<p>This function immediately invokes the closure, <code>f</code>, but arranges things so
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that <code>task::park</code> will produce a <code>Task</code> handle that includes the given
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unpark event.</p>
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