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Redesign the
Task struct to reduce lock contention (#433)
* Move a Task's `ExitValue` out of its `RunState` so that `RunState` can be separately accessed atomically. * Move immutable fields into `Task` and mutable fields into `TaskInner` (excluding atomic fields), which reduces lock contention. Most fields can now be accessed without acquiring locks. * Use properly-aligned and -sized atomic types such that native atomic instructions are actually used. For this, we switch from `atomic::Atomic` to `crossbeam_utils::atomic::AtomicCell` since it actually compiles down to native atomics. * Statically assert that all types wrapped in `AtomicCell` actually use native atomic instructions. * The `runstate` and `running_on_cpu` fields of `Task` are now atomically accessible in a lock-free manner. This is beneficial for blocking/unblocking tasks in a lock-free context, e.g., within an interrupt handler. * Remove now-unnecessary unsafe statements from `schedule()` df721e3
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| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `APIC_SPURIOUS_INTERRUPT_VECTOR` constant in crate `apic`."><meta name="keywords" content="rust, rustlang, rust-lang, APIC_SPURIOUS_INTERRUPT_VECTOR"><title>APIC_SPURIOUS_INTERRUPT_VECTOR in apic - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><script src="../crates.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg"> | ||
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| <link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc constant"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../apic/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="index.html">apic</a></p><div id="sidebar-vars" data-name="APIC_SPURIOUS_INTERRUPT_VECTOR" data-ty="constant" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button">?</button> | ||
| <a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" height="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Constant <a href="index.html">apic</a>::<wbr><a class="constant" href="">APIC_SPURIOUS_INTERRUPT_VECTOR</a><button id="copy-path" onclick="copy_path(this)"><img src="../clipboard.svg" width="19" height="18" alt="Copy item import"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/apic/lib.rs.html#180" title="goto source code">[src]</a></span></h1><pre class="rust const">pub const APIC_SPURIOUS_INTERRUPT_VECTOR: u32 = 0xFF;</pre></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="apic" data-search-index-js="../search-index.js" data-search-js="../search.js"></div> | ||
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