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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `unpark_requeue` fn in crate `parking_lot_core`."><meta name="keywords" content="rust, rustlang, rust-lang, unpark_requeue"><title>parking_lot_core::unpark_requeue - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../parking_lot_core/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>parking_lot_core</a></p><script>window.sidebarCurrent = {name: 'unpark_requeue', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/parking_lot_core/parking_lot.rs.html#853-871' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='index.html'>parking_lot_core</a>::<wbr><a class="fn" href=''>unpark_requeue</a></span></h1><pre class='rust fn'>pub unsafe fn unpark_requeue<V, C>(<br> key_from: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> key_to: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> validate: V, <br> callback: C<br>) -> <a class="struct" href="../parking_lot_core/struct.UnparkResult.html" title="struct parking_lot_core::UnparkResult">UnparkResult</a> <span class="where fmt-newline">where<br> V: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> <a class="enum" href="../parking_lot_core/enum.RequeueOp.html" title="enum parking_lot_core::RequeueOp">RequeueOp</a>,<br> C: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="enum" href="../parking_lot_core/enum.RequeueOp.html" title="enum parking_lot_core::RequeueOp">RequeueOp</a>, <a class="struct" href="../parking_lot_core/struct.UnparkResult.html" title="struct parking_lot_core::UnparkResult">UnparkResult</a>) -> <a class="struct" href="../parking_lot_core/struct.UnparkToken.html" title="struct parking_lot_core::UnparkToken">UnparkToken</a>, </span></pre><div class='docblock'><p>Removes all threads from the queue associated with <code>key_from</code>, optionally
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unparks the first one and requeues the rest onto the queue associated with
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<code>key_to</code>.</p>
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<p>The <code>validate</code> function is called while both queues are locked. Its return
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value will determine which operation is performed, or whether the operation
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should be aborted. See <code>RequeueOp</code> for details about the different possible
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return values.</p>
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<p>The <code>callback</code> function is also called while both queues are locked. It is
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passed the <code>RequeueOp</code> returned by <code>validate</code> and an <code>UnparkResult</code>
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indicating whether a thread was unparked and whether there are threads still
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parked in the new queue. This <code>UnparkResult</code> value is also returned by
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<code>unpark_requeue</code>.</p>
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<p>The <code>callback</code> function should return an <code>UnparkToken</code> value which will be
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passed to the thread that is unparked. If no thread is unparked then the
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returned value is ignored.</p>
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<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
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<p>You should only call this function with an address that you control, since
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you could otherwise interfere with the operation of other synchronization
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primitives.</p>
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<p>The <code>validate</code> and <code>callback</code> functions are called while the queue is locked
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and must not panic or call into any function in <code>parking_lot</code>.</p>
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