| <!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/hyper-0.14.26/src/common/watch.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>watch.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="../../../hyper/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="../../../hyper/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="doccomment">//! An SPSC broadcast channel. |
| //! |
| //! - The value can only be a `usize`. |
| //! - The consumer is only notified if the value is different. |
| //! - The value `0` is reserved for closed. |
| |
| </span><span class="kw">use </span>futures_util::task::AtomicWaker; |
| <span class="kw">use </span>std::sync::{ |
| atomic::{AtomicUsize, Ordering}, |
| Arc, |
| }; |
| <span class="kw">use </span>std::task; |
| |
| <span class="kw">type </span>Value = usize; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>CLOSED: usize = <span class="number">0</span>; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>channel(initial: Value) -> (Sender, Receiver) { |
| <span class="macro">debug_assert!</span>( |
| initial != CLOSED, |
| <span class="string">"watch::channel initial state of 0 is reserved" |
| </span>); |
| |
| <span class="kw">let </span>shared = Arc::new(Shared { |
| value: AtomicUsize::new(initial), |
| waker: AtomicWaker::new(), |
| }); |
| |
| ( |
| Sender { |
| shared: shared.clone(), |
| }, |
| Receiver { shared }, |
| ) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Sender { |
| shared: Arc<Shared>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Receiver { |
| shared: Arc<Shared>, |
| } |
| |
| <span class="kw">struct </span>Shared { |
| value: AtomicUsize, |
| waker: AtomicWaker, |
| } |
| |
| <span class="kw">impl </span>Sender { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>send(<span class="kw-2">&mut </span><span class="self">self</span>, value: Value) { |
| <span class="kw">if </span><span class="self">self</span>.shared.value.swap(value, Ordering::SeqCst) != value { |
| <span class="self">self</span>.shared.waker.wake(); |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Sender { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.send(CLOSED); |
| } |
| } |
| |
| <span class="kw">impl </span>Receiver { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>load(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>) -> Value { |
| <span class="self">self</span>.shared.waker.register(cx.waker()); |
| <span class="self">self</span>.shared.value.load(Ordering::SeqCst) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>peek(<span class="kw-2">&</span><span class="self">self</span>) -> Value { |
| <span class="self">self</span>.shared.value.load(Ordering::Relaxed) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="hyper" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
