| <!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 of the Rust file `/root/.cargo/git/checkouts/tokio-377c595163f99a10/dfe252d/tokio/src/util/wake.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>wake.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tokio/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tokio/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::loom::sync::Arc; |
| |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::mem::ManuallyDrop; |
| <span class="kw">use </span>std::ops::Deref; |
| <span class="kw">use </span>std::task::{RawWaker, RawWakerVTable, Waker}; |
| |
| <span class="doccomment">/// Simplified waking interface based on Arcs. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Wake: Send + Sync + Sized + <span class="lifetime">'static </span>{ |
| <span class="doccomment">/// Wake by value. |
| </span><span class="kw">fn </span>wake(arc_self: Arc<<span class="self">Self</span>>); |
| |
| <span class="doccomment">/// Wake by reference. |
| </span><span class="kw">fn </span>wake_by_ref(arc_self: <span class="kw-2">&</span>Arc<<span class="self">Self</span>>); |
| } |
| |
| <span class="doccomment">/// A `Waker` that is only valid for a given lifetime. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>WakerRef<<span class="lifetime">'a</span>> { |
| waker: ManuallyDrop<Waker>, |
| _p: PhantomData<<span class="kw-2">&</span><span class="lifetime">'a </span>()>, |
| } |
| |
| <span class="kw">impl </span>Deref <span class="kw">for </span>WakerRef<<span class="lifetime">'_</span>> { |
| <span class="kw">type </span>Target = Waker; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Waker { |
| <span class="kw-2">&</span><span class="self">self</span>.waker |
| } |
| } |
| |
| <span class="doccomment">/// Creates a reference to a `Waker` from a reference to `Arc<impl Wake>`. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>waker_ref<W: Wake>(wake: <span class="kw-2">&</span>Arc<W>) -> WakerRef<<span class="lifetime">'_</span>> { |
| <span class="kw">let </span>ptr = Arc::as_ptr(wake) <span class="kw">as </span><span class="kw-2">*const </span>(); |
| |
| <span class="kw">let </span>waker = <span class="kw">unsafe </span>{ Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) }; |
| |
| WakerRef { |
| waker: ManuallyDrop::new(waker), |
| _p: PhantomData, |
| } |
| } |
| |
| <span class="kw">fn </span>waker_vtable<W: Wake>() -> <span class="kw-2">&</span><span class="lifetime">'static </span>RawWakerVTable { |
| <span class="kw-2">&</span>RawWakerVTable::new( |
| clone_arc_raw::<W>, |
| wake_arc_raw::<W>, |
| wake_by_ref_arc_raw::<W>, |
| drop_arc_raw::<W>, |
| ) |
| } |
| |
| <span class="kw">unsafe fn </span>inc_ref_count<T: Wake>(data: <span class="kw-2">*const </span>()) { |
| <span class="comment">// Retain Arc, but don't touch refcount by wrapping in ManuallyDrop |
| </span><span class="kw">let </span>arc = ManuallyDrop::new(Arc::<T>::from_raw(data <span class="kw">as </span><span class="kw-2">*const </span>T)); |
| |
| <span class="comment">// Now increase refcount, but don't drop new refcount either |
| </span><span class="kw">let </span>_arc_clone: ManuallyDrop<<span class="kw">_</span>> = arc.clone(); |
| } |
| |
| <span class="kw">unsafe fn </span>clone_arc_raw<T: Wake>(data: <span class="kw-2">*const </span>()) -> RawWaker { |
| inc_ref_count::<T>(data); |
| RawWaker::new(data, waker_vtable::<T>()) |
| } |
| |
| <span class="kw">unsafe fn </span>wake_arc_raw<T: Wake>(data: <span class="kw-2">*const </span>()) { |
| <span class="kw">let </span>arc: Arc<T> = Arc::from_raw(data <span class="kw">as </span><span class="kw-2">*const </span>T); |
| Wake::wake(arc); |
| } |
| |
| <span class="comment">// used by `waker_ref` |
| </span><span class="kw">unsafe fn </span>wake_by_ref_arc_raw<T: Wake>(data: <span class="kw-2">*const </span>()) { |
| <span class="comment">// Retain Arc, but don't touch refcount by wrapping in ManuallyDrop |
| </span><span class="kw">let </span>arc = ManuallyDrop::new(Arc::<T>::from_raw(data <span class="kw">as </span><span class="kw-2">*const </span>T)); |
| Wake::wake_by_ref(<span class="kw-2">&</span>arc); |
| } |
| |
| <span class="kw">unsafe fn </span>drop_arc_raw<T: Wake>(data: <span class="kw-2">*const </span>()) { |
| drop(Arc::<T>::from_raw(data <span class="kw">as </span><span class="kw-2">*const </span>T)) |
| } |
| </code></pre></div> |
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