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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `join_context` fn in crate `rayon_core`."><metaname="keywords"content="rust, rustlang, rust-lang, join_context"><title>rayon_core::join_context - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../rayon_core/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><divclass="sidebar-elems"><pclass='location'><ahref='index.html'>rayon_core</a></p><script>window.sidebarCurrent={name:'join_context',ty:'fn',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/rayon_core/join/mod.rs.html#111-176'title='goto source code'>[src]</a></span><spanclass='in-band'>Function <ahref='index.html'>rayon_core</a>::<wbr><aclass="fn"href=''>join_context</a></span></h1><preclass='rust fn'>pub fn join_context<A, B, RA, RB>(oper_a: A, oper_b: B) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>RA, RB<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a><spanclass="where fmt-newline">where<br> A: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html"title="trait core::ops::function::FnOnce">FnOnce</a>(<aclass="struct"href="../rayon_core/struct.FnContext.html"title="struct rayon_core::FnContext">FnContext</a>) -> RA + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>,<br> B: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html"title="trait core::ops::function::FnOnce">FnOnce</a>(<aclass="struct"href="../rayon_core/struct.FnContext.html"title="struct rayon_core::FnContext">FnContext</a>) -> RB + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>,<br> RA: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>,<br> RB: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>, </span></pre><divclass='docblock'><p>Identical to <code>join</code>, except that the closures have a parameter
that provides context for the way the closure has been called,
especially indicating whether they're executing on a different
thread than where <code>join_context</code> was called. This will occur if
the second job is stolen by a different thread, or if
<code>join_context</code> was called from outside the thread pool to begin
with.</p>
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