| <!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/registry/src/github.com-1ecc6299db9ec823/futures-task-0.3.28/src/waker.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>waker.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="../../futures_task/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="../../futures_task/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">super</span>::arc_wake::ArcWake; |
| <span class="kw">use </span>alloc::sync::Arc; |
| <span class="kw">use </span>core::mem; |
| <span class="kw">use </span>core::task::{RawWaker, RawWakerVTable, Waker}; |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>waker_vtable<W: ArcWake>() -> <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="doccomment">/// Creates a [`Waker`] from an `Arc<impl ArcWake>`. |
| /// |
| /// The returned [`Waker`] will call |
| /// [`ArcWake.wake()`](ArcWake::wake) if awoken. |
| </span><span class="kw">pub fn </span>waker<W>(wake: Arc<W>) -> Waker |
| <span class="kw">where |
| </span>W: ArcWake + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">let </span>ptr = Arc::into_raw(wake).cast::<()>(); |
| |
| <span class="kw">unsafe </span>{ Waker::from_raw(RawWaker::new(ptr, waker_vtable::<W>())) } |
| } |
| |
| <span class="comment">// FIXME: panics on Arc::clone / refcount changes could wreak havoc on the |
| // code here. We should guard against this by aborting. |
| |
| </span><span class="attribute">#[allow(clippy::redundant_clone)] </span><span class="comment">// The clone here isn't actually redundant. |
| </span><span class="kw">unsafe fn </span>increase_refcount<T: ArcWake>(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 = mem::ManuallyDrop::new(Arc::<T>::from_raw(data.cast::<T>())); |
| <span class="comment">// Now increase refcount, but don't drop new refcount either |
| </span><span class="kw">let </span>_arc_clone: mem::ManuallyDrop<<span class="kw">_</span>> = arc.clone(); |
| } |
| |
| <span class="comment">// used by `waker_ref` |
| </span><span class="kw">unsafe fn </span>clone_arc_raw<T: ArcWake>(data: <span class="kw-2">*const </span>()) -> RawWaker { |
| increase_refcount::<T>(data); |
| RawWaker::new(data, waker_vtable::<T>()) |
| } |
| |
| <span class="kw">unsafe fn </span>wake_arc_raw<T: ArcWake>(data: <span class="kw-2">*const </span>()) { |
| <span class="kw">let </span>arc: Arc<T> = Arc::from_raw(data.cast::<T>()); |
| ArcWake::wake(arc); |
| } |
| |
| <span class="comment">// used by `waker_ref` |
| </span><span class="kw">unsafe fn </span>wake_by_ref_arc_raw<T: ArcWake>(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 = mem::ManuallyDrop::new(Arc::<T>::from_raw(data.cast::<T>())); |
| ArcWake::wake_by_ref(<span class="kw-2">&</span>arc); |
| } |
| |
| <span class="kw">unsafe fn </span>drop_arc_raw<T: ArcWake>(data: <span class="kw-2">*const </span>()) { |
| drop(Arc::<T>::from_raw(data.cast::<T>())) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="futures_task" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |