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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="Removes all threads from the queue associated with `key_from`, optionally unparks the first one and requeues the rest onto the queue associated with `key_to`."><meta name="keywords" content="rust, rustlang, rust-lang, unpark_requeue"><title>unpark_requeue in parking_lot_core - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><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="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">parking_lot_core</a></h2><div id="sidebar-vars" data-name="unpark_requeue" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../parking_lot_core/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><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><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">parking_lot_core</a>::<wbr><a class="fn" href="#">unpark_requeue</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><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#880-983" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub unsafe fn unpark_requeue(<br> key_from: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a>, <br> key_to: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.usize.html">usize</a>, <br> validate: impl <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> <a class="enum" href="enum.RequeueOp.html" title="enum parking_lot_core::RequeueOp">RequeueOp</a>, <br> callback: impl <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="enum" href="enum.RequeueOp.html" title="enum parking_lot_core::RequeueOp">RequeueOp</a>, <a class="struct" href="struct.UnparkResult.html" title="struct parking_lot_core::UnparkResult">UnparkResult</a>) -> <a class="struct" href="struct.UnparkToken.html" title="struct parking_lot_core::UnparkToken">UnparkToken</a><br>) -> <a class="struct" href="struct.UnparkResult.html" title="struct parking_lot_core::UnparkResult">UnparkResult</a></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><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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<h2 id="safety" class="section-header"><a href="#safety">Safety</a></h2>
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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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