2329 lines
146 KiB
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2329 lines
146 KiB
HTML
<!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="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/atomic.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>atomic.rs.html -- source</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 source"><!--[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='../../crossbeam_epoch/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></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"><pre class="line-numbers"><span id="1"> 1</span>
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|
||
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|
||
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||
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||
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|
||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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||
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|
||
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||
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|
||
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||
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||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
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|
||
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
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|
||
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|
||
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|
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|
||
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|
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|
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|
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|
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|
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|
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|
||
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|
||
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|
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|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<span id="859"> 859</span>
|
||
<span id="860"> 860</span>
|
||
<span id="861"> 861</span>
|
||
<span id="862"> 862</span>
|
||
<span id="863"> 863</span>
|
||
<span id="864"> 864</span>
|
||
<span id="865"> 865</span>
|
||
<span id="866"> 866</span>
|
||
<span id="867"> 867</span>
|
||
<span id="868"> 868</span>
|
||
<span id="869"> 869</span>
|
||
<span id="870"> 870</span>
|
||
<span id="871"> 871</span>
|
||
<span id="872"> 872</span>
|
||
<span id="873"> 873</span>
|
||
<span id="874"> 874</span>
|
||
<span id="875"> 875</span>
|
||
<span id="876"> 876</span>
|
||
<span id="877"> 877</span>
|
||
<span id="878"> 878</span>
|
||
<span id="879"> 879</span>
|
||
<span id="880"> 880</span>
|
||
<span id="881"> 881</span>
|
||
<span id="882"> 882</span>
|
||
<span id="883"> 883</span>
|
||
<span id="884"> 884</span>
|
||
<span id="885"> 885</span>
|
||
<span id="886"> 886</span>
|
||
<span id="887"> 887</span>
|
||
<span id="888"> 888</span>
|
||
<span id="889"> 889</span>
|
||
<span id="890"> 890</span>
|
||
<span id="891"> 891</span>
|
||
<span id="892"> 892</span>
|
||
<span id="893"> 893</span>
|
||
<span id="894"> 894</span>
|
||
<span id="895"> 895</span>
|
||
<span id="896"> 896</span>
|
||
<span id="897"> 897</span>
|
||
<span id="898"> 898</span>
|
||
<span id="899"> 899</span>
|
||
<span id="900"> 900</span>
|
||
<span id="901"> 901</span>
|
||
<span id="902"> 902</span>
|
||
<span id="903"> 903</span>
|
||
<span id="904"> 904</span>
|
||
<span id="905"> 905</span>
|
||
<span id="906"> 906</span>
|
||
<span id="907"> 907</span>
|
||
<span id="908"> 908</span>
|
||
<span id="909"> 909</span>
|
||
<span id="910"> 910</span>
|
||
<span id="911"> 911</span>
|
||
<span id="912"> 912</span>
|
||
<span id="913"> 913</span>
|
||
<span id="914"> 914</span>
|
||
<span id="915"> 915</span>
|
||
<span id="916"> 916</span>
|
||
<span id="917"> 917</span>
|
||
<span id="918"> 918</span>
|
||
<span id="919"> 919</span>
|
||
<span id="920"> 920</span>
|
||
<span id="921"> 921</span>
|
||
<span id="922"> 922</span>
|
||
<span id="923"> 923</span>
|
||
<span id="924"> 924</span>
|
||
<span id="925"> 925</span>
|
||
<span id="926"> 926</span>
|
||
<span id="927"> 927</span>
|
||
<span id="928"> 928</span>
|
||
<span id="929"> 929</span>
|
||
<span id="930"> 930</span>
|
||
<span id="931"> 931</span>
|
||
<span id="932"> 932</span>
|
||
<span id="933"> 933</span>
|
||
<span id="934"> 934</span>
|
||
<span id="935"> 935</span>
|
||
<span id="936"> 936</span>
|
||
<span id="937"> 937</span>
|
||
<span id="938"> 938</span>
|
||
<span id="939"> 939</span>
|
||
<span id="940"> 940</span>
|
||
<span id="941"> 941</span>
|
||
<span id="942"> 942</span>
|
||
<span id="943"> 943</span>
|
||
<span id="944"> 944</span>
|
||
<span id="945"> 945</span>
|
||
<span id="946"> 946</span>
|
||
<span id="947"> 947</span>
|
||
<span id="948"> 948</span>
|
||
<span id="949"> 949</span>
|
||
<span id="950"> 950</span>
|
||
<span id="951"> 951</span>
|
||
<span id="952"> 952</span>
|
||
<span id="953"> 953</span>
|
||
<span id="954"> 954</span>
|
||
<span id="955"> 955</span>
|
||
<span id="956"> 956</span>
|
||
<span id="957"> 957</span>
|
||
<span id="958"> 958</span>
|
||
<span id="959"> 959</span>
|
||
<span id="960"> 960</span>
|
||
<span id="961"> 961</span>
|
||
<span id="962"> 962</span>
|
||
<span id="963"> 963</span>
|
||
<span id="964"> 964</span>
|
||
<span id="965"> 965</span>
|
||
<span id="966"> 966</span>
|
||
<span id="967"> 967</span>
|
||
<span id="968"> 968</span>
|
||
<span id="969"> 969</span>
|
||
<span id="970"> 970</span>
|
||
<span id="971"> 971</span>
|
||
<span id="972"> 972</span>
|
||
<span id="973"> 973</span>
|
||
<span id="974"> 974</span>
|
||
<span id="975"> 975</span>
|
||
<span id="976"> 976</span>
|
||
<span id="977"> 977</span>
|
||
<span id="978"> 978</span>
|
||
<span id="979"> 979</span>
|
||
<span id="980"> 980</span>
|
||
<span id="981"> 981</span>
|
||
<span id="982"> 982</span>
|
||
<span id="983"> 983</span>
|
||
<span id="984"> 984</span>
|
||
<span id="985"> 985</span>
|
||
<span id="986"> 986</span>
|
||
<span id="987"> 987</span>
|
||
<span id="988"> 988</span>
|
||
<span id="989"> 989</span>
|
||
<span id="990"> 990</span>
|
||
<span id="991"> 991</span>
|
||
<span id="992"> 992</span>
|
||
<span id="993"> 993</span>
|
||
<span id="994"> 994</span>
|
||
<span id="995"> 995</span>
|
||
<span id="996"> 996</span>
|
||
<span id="997"> 997</span>
|
||
<span id="998"> 998</span>
|
||
<span id="999"> 999</span>
|
||
<span id="1000">1000</span>
|
||
<span id="1001">1001</span>
|
||
<span id="1002">1002</span>
|
||
<span id="1003">1003</span>
|
||
<span id="1004">1004</span>
|
||
<span id="1005">1005</span>
|
||
<span id="1006">1006</span>
|
||
<span id="1007">1007</span>
|
||
<span id="1008">1008</span>
|
||
<span id="1009">1009</span>
|
||
<span id="1010">1010</span>
|
||
<span id="1011">1011</span>
|
||
<span id="1012">1012</span>
|
||
<span id="1013">1013</span>
|
||
<span id="1014">1014</span>
|
||
<span id="1015">1015</span>
|
||
<span id="1016">1016</span>
|
||
<span id="1017">1017</span>
|
||
<span id="1018">1018</span>
|
||
<span id="1019">1019</span>
|
||
<span id="1020">1020</span>
|
||
<span id="1021">1021</span>
|
||
<span id="1022">1022</span>
|
||
<span id="1023">1023</span>
|
||
<span id="1024">1024</span>
|
||
<span id="1025">1025</span>
|
||
<span id="1026">1026</span>
|
||
<span id="1027">1027</span>
|
||
<span id="1028">1028</span>
|
||
<span id="1029">1029</span>
|
||
<span id="1030">1030</span>
|
||
<span id="1031">1031</span>
|
||
<span id="1032">1032</span>
|
||
<span id="1033">1033</span>
|
||
<span id="1034">1034</span>
|
||
<span id="1035">1035</span>
|
||
<span id="1036">1036</span>
|
||
<span id="1037">1037</span>
|
||
<span id="1038">1038</span>
|
||
<span id="1039">1039</span>
|
||
<span id="1040">1040</span>
|
||
<span id="1041">1041</span>
|
||
<span id="1042">1042</span>
|
||
<span id="1043">1043</span>
|
||
<span id="1044">1044</span>
|
||
<span id="1045">1045</span>
|
||
<span id="1046">1046</span>
|
||
<span id="1047">1047</span>
|
||
<span id="1048">1048</span>
|
||
<span id="1049">1049</span>
|
||
<span id="1050">1050</span>
|
||
<span id="1051">1051</span>
|
||
<span id="1052">1052</span>
|
||
<span id="1053">1053</span>
|
||
<span id="1054">1054</span>
|
||
<span id="1055">1055</span>
|
||
<span id="1056">1056</span>
|
||
<span id="1057">1057</span>
|
||
<span id="1058">1058</span>
|
||
<span id="1059">1059</span>
|
||
<span id="1060">1060</span>
|
||
<span id="1061">1061</span>
|
||
<span id="1062">1062</span>
|
||
<span id="1063">1063</span>
|
||
<span id="1064">1064</span>
|
||
<span id="1065">1065</span>
|
||
<span id="1066">1066</span>
|
||
<span id="1067">1067</span>
|
||
<span id="1068">1068</span>
|
||
<span id="1069">1069</span>
|
||
<span id="1070">1070</span>
|
||
<span id="1071">1071</span>
|
||
<span id="1072">1072</span>
|
||
<span id="1073">1073</span>
|
||
<span id="1074">1074</span>
|
||
<span id="1075">1075</span>
|
||
<span id="1076">1076</span>
|
||
<span id="1077">1077</span>
|
||
<span id="1078">1078</span>
|
||
<span id="1079">1079</span>
|
||
<span id="1080">1080</span>
|
||
<span id="1081">1081</span>
|
||
<span id="1082">1082</span>
|
||
<span id="1083">1083</span>
|
||
<span id="1084">1084</span>
|
||
<span id="1085">1085</span>
|
||
<span id="1086">1086</span>
|
||
<span id="1087">1087</span>
|
||
<span id="1088">1088</span>
|
||
<span id="1089">1089</span>
|
||
<span id="1090">1090</span>
|
||
<span id="1091">1091</span>
|
||
<span id="1092">1092</span>
|
||
<span id="1093">1093</span>
|
||
<span id="1094">1094</span>
|
||
<span id="1095">1095</span>
|
||
<span id="1096">1096</span>
|
||
<span id="1097">1097</span>
|
||
<span id="1098">1098</span>
|
||
<span id="1099">1099</span>
|
||
<span id="1100">1100</span>
|
||
<span id="1101">1101</span>
|
||
<span id="1102">1102</span>
|
||
<span id="1103">1103</span>
|
||
<span id="1104">1104</span>
|
||
<span id="1105">1105</span>
|
||
<span id="1106">1106</span>
|
||
<span id="1107">1107</span>
|
||
<span id="1108">1108</span>
|
||
<span id="1109">1109</span>
|
||
<span id="1110">1110</span>
|
||
<span id="1111">1111</span>
|
||
<span id="1112">1112</span>
|
||
<span id="1113">1113</span>
|
||
<span id="1114">1114</span>
|
||
<span id="1115">1115</span>
|
||
<span id="1116">1116</span>
|
||
<span id="1117">1117</span>
|
||
<span id="1118">1118</span>
|
||
<span id="1119">1119</span>
|
||
<span id="1120">1120</span>
|
||
<span id="1121">1121</span>
|
||
<span id="1122">1122</span>
|
||
<span id="1123">1123</span>
|
||
<span id="1124">1124</span>
|
||
<span id="1125">1125</span>
|
||
<span id="1126">1126</span>
|
||
<span id="1127">1127</span>
|
||
<span id="1128">1128</span>
|
||
<span id="1129">1129</span>
|
||
<span id="1130">1130</span>
|
||
<span id="1131">1131</span>
|
||
<span id="1132">1132</span>
|
||
<span id="1133">1133</span>
|
||
<span id="1134">1134</span>
|
||
<span id="1135">1135</span>
|
||
<span id="1136">1136</span>
|
||
<span id="1137">1137</span>
|
||
<span id="1138">1138</span>
|
||
<span id="1139">1139</span>
|
||
<span id="1140">1140</span>
|
||
<span id="1141">1141</span>
|
||
<span id="1142">1142</span>
|
||
<span id="1143">1143</span>
|
||
<span id="1144">1144</span>
|
||
<span id="1145">1145</span>
|
||
<span id="1146">1146</span>
|
||
<span id="1147">1147</span>
|
||
<span id="1148">1148</span>
|
||
<span id="1149">1149</span>
|
||
<span id="1150">1150</span>
|
||
<span id="1151">1151</span>
|
||
<span id="1152">1152</span>
|
||
<span id="1153">1153</span>
|
||
<span id="1154">1154</span>
|
||
<span id="1155">1155</span>
|
||
<span id="1156">1156</span>
|
||
<span id="1157">1157</span>
|
||
<span id="1158">1158</span>
|
||
<span id="1159">1159</span>
|
||
<span id="1160">1160</span>
|
||
<span id="1161">1161</span>
|
||
<span id="1162">1162</span>
|
||
<span id="1163">1163</span>
|
||
</pre><div class="example-wrap"><pre class="rust ">
|
||
<span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">boxed</span>::<span class="ident">Box</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">borrow</span>::{<span class="ident">Borrow</span>, <span class="ident">BorrowMut</span>};
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>};
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>;
|
||
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
|
||
|
||
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">atomic</span>::<span class="ident">AtomicConsume</span>;
|
||
<span class="kw">use</span> <span class="ident">guard</span>::<span class="ident">Guard</span>;
|
||
|
||
<span class="doccomment">/// Given ordering for the success case in a compare-exchange operation, returns the strongest</span>
|
||
<span class="doccomment">/// appropriate ordering for the failure case.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">strongest_failure_ordering</span>(<span class="ident">ord</span>: <span class="ident">Ordering</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
|
||
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">Ordering</span>::<span class="kw-2">*</span>;
|
||
<span class="kw">match</span> <span class="ident">ord</span> {
|
||
<span class="ident">Relaxed</span> <span class="op">|</span> <span class="ident">Release</span> <span class="op">=</span><span class="op">></span> <span class="ident">Relaxed</span>,
|
||
<span class="ident">Acquire</span> <span class="op">|</span> <span class="ident">AcqRel</span> <span class="op">=</span><span class="op">></span> <span class="ident">Acquire</span>,
|
||
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="ident">SeqCst</span>,
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// The error returned on failed compare-and-set operation.</span>
|
||
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="lifetime">'g</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
|
||
<span class="doccomment">/// The value in the atomic pointer at the time of the failed operation.</span>
|
||
<span class="kw">pub</span> <span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>,
|
||
|
||
<span class="doccomment">/// The new value, which the operation failed to store.</span>
|
||
<span class="kw">pub</span> <span class="ident">new</span>: <span class="ident">P</span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="lifetime">'g</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"CompareAndSetError"</span>)
|
||
.<span class="ident">field</span>(<span class="string">"current"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">current</span>)
|
||
.<span class="ident">field</span>(<span class="string">"new"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">new</span>)
|
||
.<span class="ident">finish</span>()
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Memory orderings for compare-and-set operations.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// A compare-and-set operation can have different memory orderings depending on whether it</span>
|
||
<span class="doccomment">/// succeeds or fails. This trait generalizes different ways of specifying memory orderings.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The two ways of specifying orderings for compare-and-set are:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// 1. Just one `Ordering` for the success case. In case of failure, the strongest appropriate</span>
|
||
<span class="doccomment">/// ordering is chosen.</span>
|
||
<span class="doccomment">/// 2. A pair of `Ordering`s. The first one is for the success case, while the second one is</span>
|
||
<span class="doccomment">/// for the failure case.</span>
|
||
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">CompareAndSetOrdering</span> {
|
||
<span class="doccomment">/// The ordering of the operation when it succeeds.</span>
|
||
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>;
|
||
|
||
<span class="doccomment">/// The ordering of the operation when it fails.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The failure ordering can't be `Release` or `AcqRel` and must be equivalent or weaker than</span>
|
||
<span class="doccomment">/// the success ordering.</span>
|
||
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span>;
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">CompareAndSetOrdering</span> <span class="kw">for</span> <span class="ident">Ordering</span> {
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
|
||
<span class="kw-2">*</span><span class="self">self</span>
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
|
||
<span class="ident">strongest_failure_ordering</span>(<span class="kw-2">*</span><span class="self">self</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">CompareAndSetOrdering</span> <span class="kw">for</span> (<span class="ident">Ordering</span>, <span class="ident">Ordering</span>) {
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
|
||
<span class="self">self</span>.<span class="number">0</span>
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">failure</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Ordering</span> {
|
||
<span class="self">self</span>.<span class="number">1</span>
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Panics if the pointer is not properly unaligned.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">ensure_aligned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) {
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="number">0</span>, <span class="string">"unaligned pointer"</span>);
|
||
}
|
||
|
||
<span class="doccomment">/// Returns a bitmask containing the unused least significant bits of an aligned pointer to `T`.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">low_bits</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
(<span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="ident">mem</span>::<span class="ident">align_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>().<span class="ident">trailing_zeros</span>()) <span class="op">-</span> <span class="number">1</span>
|
||
}
|
||
|
||
<span class="doccomment">/// Given a tagged pointer `data`, returns the same pointer, but tagged with `tag`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// `tag` is truncated to fit into the unused bits of the pointer to `T`.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">data_with_tag</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="ident">usize</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
(<span class="ident">data</span> <span class="op">&</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()) <span class="op">|</span> (<span class="ident">tag</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>())
|
||
}
|
||
|
||
<span class="doccomment">/// Decomposes a tagged pointer `data` into the pointer and the tag.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">decompose_data</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> (<span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">usize</span>) {
|
||
<span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> (<span class="ident">data</span> <span class="op">&</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>;
|
||
<span class="kw">let</span> <span class="ident">tag</span> <span class="op">=</span> <span class="ident">data</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>();
|
||
(<span class="ident">raw</span>, <span class="ident">tag</span>)
|
||
}
|
||
|
||
<span class="doccomment">/// An atomic pointer that can be safely shared between threads.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
|
||
<span class="doccomment">/// least significant bits of the address. More precisely, a tag should be less than `(1 <<</span>
|
||
<span class="doccomment">/// mem::align_of::<T>().trailing_zeros())`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Any method that loads the pointer must be passed a reference to a [`Guard`].</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Guard`]: struct.Guard.html</span>
|
||
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="ident">data</span>: <span class="ident">AtomicUsize</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
|
||
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new atomic pointer pointing to the tagged pointer `data`.</span>
|
||
<span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="self">Self</span> {
|
||
<span class="ident">data</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="ident">data</span>),
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Returns a new null atomic pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::null();</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"nightly"</span>))]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">null</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">Self</span> {
|
||
<span class="ident">data</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Returns a new null atomic pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::null();</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"nightly"</span>)]</span>
|
||
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">null</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">Self</span> {
|
||
<span class="ident">data</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Allocates `value` on the heap and returns a new atomic pointer pointing to it.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">Self</span>::<span class="ident">from</span>(<span class="ident">Owned</span>::<span class="ident">new</span>(<span class="ident">value</span>))
|
||
}
|
||
|
||
<span class="doccomment">/// Loads a `Shared` from the atomic pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">ord</span>)) }
|
||
}
|
||
|
||
<span class="doccomment">/// Loads a `Shared` from the atomic pointer using a "consume" memory ordering.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This is similar to the "acquire" ordering, except that an ordering is</span>
|
||
<span class="doccomment">/// only guaranteed with operations that "depend on" the result of the load.</span>
|
||
<span class="doccomment">/// However consume loads are usually much faster than acquire loads on</span>
|
||
<span class="doccomment">/// architectures with a weak memory model since they don't require memory</span>
|
||
<span class="doccomment">/// fence instructions.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The exact definition of "depend on" is a bit vague, but it works as you</span>
|
||
<span class="doccomment">/// would expect in practice since a lot of software, especially the Linux</span>
|
||
<span class="doccomment">/// kernel, rely on this behavior.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load_consume(guard);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load_consume</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load_consume</span>()) }
|
||
}
|
||
|
||
<span class="doccomment">/// Stores a `Shared` or `Owned` pointer into the atomic pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// a.store(Shared::null(), SeqCst);</span>
|
||
<span class="doccomment">/// a.store(Owned::new(1234), SeqCst);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">new</span>: <span class="ident">P</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>) {
|
||
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">store</span>(<span class="ident">new</span>.<span class="ident">into_usize</span>(), <span class="ident">ord</span>);
|
||
}
|
||
|
||
<span class="doccomment">/// Stores a `Shared` or `Owned` pointer into the atomic pointer, returning the previous</span>
|
||
<span class="doccomment">/// `Shared`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.swap(Shared::null(), SeqCst, guard);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">new</span>: <span class="ident">P</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">swap</span>(<span class="ident">new</span>.<span class="ident">into_usize</span>(), <span class="ident">ord</span>)) }
|
||
}
|
||
|
||
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
|
||
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
|
||
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The return value is a result indicating whether the new pointer was written. On success the</span>
|
||
<span class="doccomment">/// pointer that was written is returned. On failure the actual current value and `new` are</span>
|
||
<span class="doccomment">/// returned.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes a [`CompareAndSetOrdering`] argument which describes the memory</span>
|
||
<span class="doccomment">/// ordering of this operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`CompareAndSetOrdering`]: trait.CompareAndSetOrdering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let mut curr = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// let res1 = a.compare_and_set(curr, Shared::null(), SeqCst, guard);</span>
|
||
<span class="doccomment">/// let res2 = a.compare_and_set(curr, Owned::new(5678), SeqCst, guard);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_set</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">O</span>, <span class="ident">P</span><span class="op">></span>(
|
||
<span class="kw-2">&</span><span class="self">self</span>,
|
||
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
|
||
<span class="ident">new</span>: <span class="ident">P</span>,
|
||
<span class="ident">ord</span>: <span class="ident">O</span>,
|
||
<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
|
||
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
|
||
<span class="kw">where</span>
|
||
<span class="ident">O</span>: <span class="ident">CompareAndSetOrdering</span>,
|
||
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
|
||
{
|
||
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">into_usize</span>();
|
||
<span class="self">self</span>.<span class="ident">data</span>
|
||
.<span class="ident">compare_exchange</span>(<span class="ident">current</span>.<span class="ident">into_usize</span>(), <span class="ident">new</span>, <span class="ident">ord</span>.<span class="ident">success</span>(), <span class="ident">ord</span>.<span class="ident">failure</span>())
|
||
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="ident">new</span>) })
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">current</span><span class="op">|</span> <span class="kw">unsafe</span> {
|
||
<span class="ident">CompareAndSetError</span> {
|
||
<span class="ident">current</span>: <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="ident">current</span>),
|
||
<span class="ident">new</span>: <span class="ident">P</span>::<span class="ident">from_usize</span>(<span class="ident">new</span>),
|
||
}
|
||
})
|
||
}
|
||
|
||
<span class="doccomment">/// Stores the pointer `new` (either `Shared` or `Owned`) into the atomic pointer if the current</span>
|
||
<span class="doccomment">/// value is the same as `current`. The tag is also taken into account, so two pointers to the</span>
|
||
<span class="doccomment">/// same object, but with different tags, will not be considered equal.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Unlike [`compare_and_set`], this method is allowed to spuriously fail even when comparison</span>
|
||
<span class="doccomment">/// succeeds, which can result in more efficient code on some platforms. The return value is a</span>
|
||
<span class="doccomment">/// result indicating whether the new pointer was written. On success the pointer that was</span>
|
||
<span class="doccomment">/// written is returned. On failure the actual current value and `new` are returned.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes a [`CompareAndSetOrdering`] argument which describes the memory</span>
|
||
<span class="doccomment">/// ordering of this operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`compare_and_set`]: struct.Atomic.html#method.compare_and_set</span>
|
||
<span class="doccomment">/// [`CompareAndSetOrdering`]: trait.CompareAndSetOrdering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let mut new = Owned::new(5678);</span>
|
||
<span class="doccomment">/// let mut ptr = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// loop {</span>
|
||
<span class="doccomment">/// match a.compare_and_set_weak(ptr, new, SeqCst, guard) {</span>
|
||
<span class="doccomment">/// Ok(p) => {</span>
|
||
<span class="doccomment">/// ptr = p;</span>
|
||
<span class="doccomment">/// break;</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// Err(err) => {</span>
|
||
<span class="doccomment">/// ptr = err.current;</span>
|
||
<span class="doccomment">/// new = err.new;</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let mut curr = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// loop {</span>
|
||
<span class="doccomment">/// match a.compare_and_set_weak(curr, Shared::null(), SeqCst, guard) {</span>
|
||
<span class="doccomment">/// Ok(_) => break,</span>
|
||
<span class="doccomment">/// Err(err) => curr = err.current,</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare_and_set_weak</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">O</span>, <span class="ident">P</span><span class="op">></span>(
|
||
<span class="kw-2">&</span><span class="self">self</span>,
|
||
<span class="ident">current</span>: <span class="ident">Shared</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
|
||
<span class="ident">new</span>: <span class="ident">P</span>,
|
||
<span class="ident">ord</span>: <span class="ident">O</span>,
|
||
<span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>,
|
||
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">CompareAndSetError</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span><span class="op">></span>
|
||
<span class="kw">where</span>
|
||
<span class="ident">O</span>: <span class="ident">CompareAndSetOrdering</span>,
|
||
<span class="ident">P</span>: <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
|
||
{
|
||
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">new</span>.<span class="ident">into_usize</span>();
|
||
<span class="self">self</span>.<span class="ident">data</span>
|
||
.<span class="ident">compare_exchange_weak</span>(<span class="ident">current</span>.<span class="ident">into_usize</span>(), <span class="ident">new</span>, <span class="ident">ord</span>.<span class="ident">success</span>(), <span class="ident">ord</span>.<span class="ident">failure</span>())
|
||
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="ident">new</span>) })
|
||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">current</span><span class="op">|</span> <span class="kw">unsafe</span> {
|
||
<span class="ident">CompareAndSetError</span> {
|
||
<span class="ident">current</span>: <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="ident">current</span>),
|
||
<span class="ident">new</span>: <span class="ident">P</span>::<span class="ident">from_usize</span>(<span class="ident">new</span>),
|
||
}
|
||
})
|
||
}
|
||
|
||
<span class="doccomment">/// Bitwise "and" with the current tag.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Performs a bitwise "and" operation on the current tag and the argument `val`, and sets the</span>
|
||
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(3));</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// assert_eq!(a.fetch_and(2, SeqCst, guard).tag(), 3);</span>
|
||
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 2);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_and</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_and</span>(<span class="ident">val</span> <span class="op">|</span> <span class="op">!</span><span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
|
||
}
|
||
|
||
<span class="doccomment">/// Bitwise "or" with the current tag.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Performs a bitwise "or" operation on the current tag and the argument `val`, and sets the</span>
|
||
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(1));</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// assert_eq!(a.fetch_or(2, SeqCst, guard).tag(), 1);</span>
|
||
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 3);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_or</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_or</span>(<span class="ident">val</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
|
||
}
|
||
|
||
<span class="doccomment">/// Bitwise "xor" with the current tag.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Performs a bitwise "xor" operation on the current tag and the argument `val`, and sets the</span>
|
||
<span class="doccomment">/// new tag to the result. Returns the previous pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method takes an [`Ordering`] argument which describes the memory ordering of this</span>
|
||
<span class="doccomment">/// operation.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Ordering`]: https://doc.rust-lang.org/std/sync/atomic/enum.Ordering.html</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Shared};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::null().with_tag(1));</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// assert_eq!(a.fetch_xor(3, SeqCst, guard).tag(), 1);</span>
|
||
<span class="doccomment">/// assert_eq!(a.load(SeqCst, guard).tag(), 2);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fetch_xor</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">usize</span>, <span class="ident">ord</span>: <span class="ident">Ordering</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">fetch_xor</span>(<span class="ident">val</span> <span class="op">&</span> <span class="ident">low_bits</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">ord</span>)) }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>);
|
||
|
||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Atomic"</span>)
|
||
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
|
||
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
|
||
.<span class="ident">finish</span>()
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Pointer</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>);
|
||
<span class="ident">fmt</span>::<span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="ident">raw</span>, <span class="ident">f</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a copy of the atomic value.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Note that a `Relaxed` load is used here. If you need synchronization, use it with other</span>
|
||
<span class="doccomment">/// atomics or fences.</span>
|
||
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>);
|
||
<span class="ident">Atomic</span>::<span class="ident">from_usize</span>(<span class="ident">data</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Atomic</span>::<span class="ident">null</span>()
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new atomic pointer pointing to `owned`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{Atomic, Owned};</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(Owned::new(1234));</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">owned</span>: <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">owned</span>.<span class="ident">data</span>;
|
||
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">owned</span>);
|
||
<span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">data</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">b</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="self">Self</span>::<span class="ident">from</span>(<span class="ident">Owned</span>::<span class="ident">from</span>(<span class="ident">b</span>))
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="self">Self</span>::<span class="ident">new</span>(<span class="ident">t</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new atomic pointer pointing to `ptr`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{Atomic, Shared};</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(Shared::<i32>::null());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">ptr</span>: <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">ptr</span>.<span class="ident">data</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Atomic</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new atomic pointer pointing to `raw`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use std::ptr;</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Atomic;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<i32>::from(ptr::null::<i32>());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>)
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// A trait for either `Owned` or `Shared` pointers.</span>
|
||
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns the machine representation of the pointer.</span>
|
||
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span>;
|
||
|
||
<span class="doccomment">/// Returns a new pointer pointing to the tagged pointer `data`.</span>
|
||
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>;
|
||
}
|
||
|
||
<span class="doccomment">/// An owned heap-allocated object.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This type is very similar to `Box<T>`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
|
||
<span class="doccomment">/// least significant bits of the address.</span>
|
||
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="ident">data</span>: <span class="ident">usize</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">data</span>;
|
||
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>);
|
||
<span class="ident">data</span>
|
||
}
|
||
|
||
<span class="doccomment">/// Returns a new pointer pointing to the tagged pointer `data`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Panics</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Panics if the data is zero in debug mode.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">data</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>, <span class="string">"converting zero into `Owned`"</span>);
|
||
<span class="ident">Owned</span> {
|
||
<span class="ident">data</span>: <span class="ident">data</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Allocates `value` on the heap and returns a new owned pointer pointing to it.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = Owned::new(1234);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">Self</span>::<span class="ident">from</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">value</span>))
|
||
}
|
||
|
||
<span class="doccomment">/// Returns a new owned pointer pointing to `raw`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This function is unsafe because improper use may lead to memory problems. Argument `raw`</span>
|
||
<span class="doccomment">/// must be a valid pointer. Also, a double-free may occur if the function is called twice on</span>
|
||
<span class="doccomment">/// the same raw pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Panics</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Panics if `raw` is not properly aligned.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="ident">ensure_aligned</span>(<span class="ident">raw</span>);
|
||
<span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>)
|
||
}
|
||
|
||
<span class="doccomment">/// Converts the owned pointer into a [`Shared`].</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Owned};</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = Owned::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = o.into_shared(guard);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// [`Shared`]: struct.Shared.html</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_shared</span><span class="op"><</span><span class="lifetime">'g</span><span class="op">></span>(<span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">Guard</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">into_usize</span>()) }
|
||
}
|
||
|
||
<span class="doccomment">/// Converts the owned pointer into a `Box`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Owned};</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = Owned::new(1234);</span>
|
||
<span class="doccomment">/// let b: Box<i32> = o.into_box();</span>
|
||
<span class="doccomment">/// assert_eq!(*b, 1234);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_box</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>);
|
||
<span class="kw">unsafe</span> { <span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="ident">raw</span>) }
|
||
}
|
||
|
||
<span class="doccomment">/// Returns the tag stored within the pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// assert_eq!(Owned::new(1234).tag(), 0);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tag</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="ident">tag</span>
|
||
}
|
||
|
||
<span class="doccomment">/// Returns the same pointer, but tagged with `tag`. `tag` is truncated to be fit into the</span>
|
||
<span class="doccomment">/// unused bits of the pointer to `T`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = Owned::new(0u64);</span>
|
||
<span class="doccomment">/// assert_eq!(o.tag(), 0);</span>
|
||
<span class="doccomment">/// let o = o.with_tag(2);</span>
|
||
<span class="doccomment">/// assert_eq!(o.tag(), 2);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_tag</span>(<span class="self">self</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">into_usize</span>();
|
||
<span class="kw">unsafe</span> { <span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">data_with_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">data</span>, <span class="ident">tag</span>)) }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="kw">unsafe</span> {
|
||
<span class="ident">drop</span>(<span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="ident">raw</span>));
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
|
||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Owned"</span>)
|
||
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
|
||
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
|
||
.<span class="ident">finish</span>()
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Owned</span>::<span class="ident">new</span>((<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">clone</span>()).<span class="ident">with_tag</span>(<span class="self">self</span>.<span class="ident">tag</span>())
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
|
||
|
||
<span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">raw</span> }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">raw</span> }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Owned</span>::<span class="ident">new</span>(<span class="ident">t</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new owned pointer pointing to `b`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Panics</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Panics if the pointer (the `Box`) is not properly aligned.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Owned;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = unsafe { Owned::from_raw(Box::into_raw(Box::new(1234))) };</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">b</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="kw">unsafe</span> { <span class="self">Self</span>::<span class="ident">from_raw</span>(<span class="ident">Box</span>::<span class="ident">into_raw</span>(<span class="ident">b</span>)) }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Borrow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">BorrowMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">borrow_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// A pointer to an object protected by the epoch GC.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The pointer is valid for use only during the lifetime `'g`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The pointer must be properly aligned. Since it is aligned, a tag can be stored into the unused</span>
|
||
<span class="doccomment">/// least significant bits of the address.</span>
|
||
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span>: <span class="lifetime">'g</span><span class="op">></span> {
|
||
<span class="ident">data</span>: <span class="ident">usize</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span>(<span class="kw-2">&</span><span class="lifetime">'g</span> (), <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>)<span class="op">></span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Shared</span> {
|
||
<span class="ident">data</span>: <span class="self">self</span>.<span class="ident">data</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Pointer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">into_usize</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
<span class="self">self</span>.<span class="ident">data</span>
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">data</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Shared</span> {
|
||
<span class="ident">data</span>: <span class="ident">data</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new null pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Shared;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let p = Shared::<i32>::null();</span>
|
||
<span class="doccomment">/// assert!(p.is_null());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">null</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="ident">Shared</span> {
|
||
<span class="ident">data</span>: <span class="number">0</span>,
|
||
<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Returns `true` if the pointer is null.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::null();</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// assert!(a.load(SeqCst, guard).is_null());</span>
|
||
<span class="doccomment">/// a.store(Owned::new(1234), SeqCst);</span>
|
||
<span class="doccomment">/// assert!(!a.load(SeqCst, guard).is_null());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_null</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
|
||
<span class="self">self</span>.<span class="ident">as_raw</span>().<span class="ident">is_null</span>()
|
||
}
|
||
|
||
<span class="doccomment">/// Converts the pointer to a raw pointer (without the tag).</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let o = Owned::new(1234);</span>
|
||
<span class="doccomment">/// let raw = &*o as *const _;</span>
|
||
<span class="doccomment">/// let a = Atomic::from(o);</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// assert_eq!(p.as_raw(), raw);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_raw</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="ident">raw</span>
|
||
}
|
||
|
||
<span class="doccomment">/// Dereferences the pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Returns a reference to the pointee that is valid during the lifetime `'g`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Safety</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Dereferencing a pointer is unsafe because it could be pointing to invalid memory.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Another concern is the possiblity of data races due to lack of proper synchronization.</span>
|
||
<span class="doccomment">/// For example, consider the following scenario:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// 1. A thread creates a new object: `a.store(Owned::new(10), Relaxed)`</span>
|
||
<span class="doccomment">/// 2. Another thread reads it: `*a.load(Relaxed, guard).as_ref().unwrap()`</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The problem is that relaxed orderings don't synchronize initialization of the object with</span>
|
||
<span class="doccomment">/// the read from the second thread. This is a data race. A possible solution would be to use</span>
|
||
<span class="doccomment">/// `Release` and `Acquire` orderings.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// unsafe {</span>
|
||
<span class="doccomment">/// assert_eq!(p.deref(), &1234);</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">as_raw</span>()
|
||
}
|
||
|
||
<span class="doccomment">/// Dereferences the pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Returns a mutable reference to the pointee that is valid during the lifetime `'g`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Safety</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// * There is no guarantee that there are no more threads attempting to read/write from/to the</span>
|
||
<span class="doccomment">/// actual object at the same time.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The user must know that there are no concurrent accesses towards the object itself.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// * Other than the above, all safety concerns of `deref()` applies here.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(vec![1, 2, 3, 4]);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let mut p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// unsafe {</span>
|
||
<span class="doccomment">/// assert!(!p.is_null());</span>
|
||
<span class="doccomment">/// let b = p.deref_mut();</span>
|
||
<span class="doccomment">/// assert_eq!(b, &vec![1, 2, 3, 4]);</span>
|
||
<span class="doccomment">/// b.push(5);</span>
|
||
<span class="doccomment">/// assert_eq!(b, &vec![1, 2, 3, 4, 5]);</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// unsafe {</span>
|
||
<span class="doccomment">/// assert_eq!(p.deref(), &vec![1, 2, 3, 4, 5]);</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'g</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
|
||
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">as_raw</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>)
|
||
}
|
||
|
||
<span class="doccomment">/// Converts the pointer to a reference.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Returns `None` if the pointer is null, or else a reference to the object wrapped in `Some`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Safety</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Dereferencing a pointer is unsafe because it could be pointing to invalid memory.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Another concern is the possiblity of data races due to lack of proper synchronization.</span>
|
||
<span class="doccomment">/// For example, consider the following scenario:</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// 1. A thread creates a new object: `a.store(Owned::new(10), Relaxed)`</span>
|
||
<span class="doccomment">/// 2. Another thread reads it: `*a.load(Relaxed, guard).as_ref().unwrap()`</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// The problem is that relaxed orderings don't synchronize initialization of the object with</span>
|
||
<span class="doccomment">/// the read from the second thread. This is a data race. A possible solution would be to use</span>
|
||
<span class="doccomment">/// `Release` and `Acquire` orderings.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// unsafe {</span>
|
||
<span class="doccomment">/// assert_eq!(p.as_ref(), Some(&1234));</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'g</span> <span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">as_raw</span>().<span class="ident">as_ref</span>()
|
||
}
|
||
|
||
<span class="doccomment">/// Takes ownership of the pointee.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Panics</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Panics if this pointer is null, but only in debug mode.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Safety</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method may be called only if the pointer is valid and nobody else is holding a</span>
|
||
<span class="doccomment">/// reference to the same object.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(1234);</span>
|
||
<span class="doccomment">/// unsafe {</span>
|
||
<span class="doccomment">/// let guard = &epoch::unprotected();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// drop(p.into_owned());</span>
|
||
<span class="doccomment">/// }</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">into_owned</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Owned</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="macro">debug_assert</span><span class="macro">!</span>(
|
||
<span class="self">self</span>.<span class="ident">as_raw</span>() <span class="op">!</span><span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">null</span>(),
|
||
<span class="string">"converting a null `Shared` into `Owned`"</span>
|
||
);
|
||
<span class="ident">Owned</span>::<span class="ident">from_usize</span>(<span class="self">self</span>.<span class="ident">data</span>)
|
||
}
|
||
|
||
<span class="doccomment">/// Returns the tag stored within the pointer.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic, Owned};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::<u64>::from(Owned::new(0u64).with_tag(2));</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// assert_eq!(p.tag(), 2);</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tag</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
|
||
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
<span class="ident">tag</span>
|
||
}
|
||
|
||
<span class="doccomment">/// Returns the same pointer, but tagged with `tag`. `tag` is truncated to be fit into the</span>
|
||
<span class="doccomment">/// unused bits of the pointer to `T`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::{self as epoch, Atomic};</span>
|
||
<span class="doccomment">/// use std::sync::atomic::Ordering::SeqCst;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let a = Atomic::new(0u64);</span>
|
||
<span class="doccomment">/// let guard = &epoch::pin();</span>
|
||
<span class="doccomment">/// let p1 = a.load(SeqCst, guard);</span>
|
||
<span class="doccomment">/// let p2 = p1.with_tag(2);</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// assert_eq!(p1.tag(), 0);</span>
|
||
<span class="doccomment">/// assert_eq!(p2.tag(), 2);</span>
|
||
<span class="doccomment">/// assert_eq!(p1.as_raw(), p2.as_raw());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_tag</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">tag</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">unsafe</span> { <span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">data_with_tag</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>, <span class="ident">tag</span>)) }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="doccomment">/// Returns a new pointer pointing to `raw`.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Panics</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// Panics if `raw` is not properly aligned.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// # Examples</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="doccomment">/// use crossbeam_epoch::Shared;</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// let p = unsafe { Shared::from(Box::into_raw(Box::new(1234)) as *const _) };</span>
|
||
<span class="doccomment">/// assert!(!p.is_null());</span>
|
||
<span class="doccomment">/// ```</span>
|
||
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">raw</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">ensure_aligned</span>(<span class="ident">raw</span>);
|
||
<span class="kw">unsafe</span> { <span class="self">Self</span>::<span class="ident">from_usize</span>(<span class="ident">raw</span> <span class="kw">as</span> <span class="ident">usize</span>) }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
|
||
<span class="self">self</span>.<span class="ident">data</span> <span class="op">=</span><span class="op">=</span> <span class="ident">other</span>.<span class="ident">data</span>
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">data</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
|
||
<span class="self">self</span>.<span class="ident">data</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">data</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="kw">let</span> (<span class="ident">raw</span>, <span class="ident">tag</span>) <span class="op">=</span> <span class="ident">decompose_data</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">data</span>);
|
||
|
||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Shared"</span>)
|
||
.<span class="ident">field</span>(<span class="string">"raw"</span>, <span class="kw-2">&</span><span class="ident">raw</span>)
|
||
.<span class="ident">field</span>(<span class="string">"tag"</span>, <span class="kw-2">&</span><span class="ident">tag</span>)
|
||
.<span class="ident">finish</span>()
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Pointer</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="ident">fmt</span>::<span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">as_raw</span>(), <span class="ident">f</span>)
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Shared</span><span class="op"><</span><span class="lifetime">'g</span>, <span class="ident">T</span><span class="op">></span> {
|
||
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||
<span class="ident">Shared</span>::<span class="ident">null</span>()
|
||
}
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
|
||
<span class="kw">mod</span> <span class="ident">tests</span> {
|
||
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Shared</span>;
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">valid_tag_i8</span>() {
|
||
<span class="ident">Shared</span>::<span class="op"><</span><span class="ident">i8</span><span class="op">></span>::<span class="ident">null</span>().<span class="ident">with_tag</span>(<span class="number">0</span>);
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">valid_tag_i64</span>() {
|
||
<span class="ident">Shared</span>::<span class="op"><</span><span class="ident">i64</span><span class="op">></span>::<span class="ident">null</span>().<span class="ident">with_tag</span>(<span class="number">7</span>);
|
||
}
|
||
}
|
||
</pre></div>
|
||
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