143 lines
6 KiB
HTML
143 lines
6 KiB
HTML
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<div class="sidebar-elems"><p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a></p><script>window.sidebarCurrent = {name: 'current', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><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=''>current</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#89-100' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn current() -> <a class="struct" href="../../futures/task/struct.Task.html" title="struct futures::task::Task">Task</a></pre><div class='docblock'><p>Returns a handle to the current task to call <code>notify</code> at a later date.</p>
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<p>The returned handle implements the <code>Send</code> and <code>'static</code> bounds and may also
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be cheaply cloned. This is useful for squirreling away the handle into a
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location which is then later signaled that a future can make progress.</p>
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<p>Implementations of the <code>Future</code> trait typically use this function if they
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would otherwise perform a blocking operation. When something isn't ready
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yet, this <code>current</code> function is called to acquire a handle to the current
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task, and then the future arranges it such that when the blocking operation
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otherwise finishes (perhaps in the background) it will <code>notify</code> the
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returned handle.</p>
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<p>It's sometimes necessary to pass extra information to the task when
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unparking it, so that the task knows something about <em>why</em> it was woken.
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See the <code>FutureQueue</code> documentation for details on how to do this.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>This function will panic if a task is not currently being executed. That
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is, this method can be dangerous to call outside of an implementation of
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<code>poll</code>.</p>
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