| <!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/crossbeam-channel-0.5.8/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="../../crossbeam_channel/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="../../crossbeam_channel/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">//! Waking mechanism for threads blocked on channel operations. |
| |
| </span><span class="kw">use </span>std::ptr; |
| <span class="kw">use </span>std::sync::atomic::{AtomicBool, Ordering}; |
| <span class="kw">use </span>std::sync::Mutex; |
| <span class="kw">use </span>std::thread::{<span class="self">self</span>, ThreadId}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::context::Context; |
| <span class="kw">use </span><span class="kw">crate</span>::select::{Operation, Selected}; |
| |
| <span class="doccomment">/// Represents a thread blocked on a specific channel operation. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Entry { |
| <span class="doccomment">/// The operation. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) oper: Operation, |
| |
| <span class="doccomment">/// Optional packet. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) packet: <span class="kw-2">*mut </span>(), |
| |
| <span class="doccomment">/// Context associated with the thread owning this operation. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) cx: Context, |
| } |
| |
| <span class="doccomment">/// A queue of threads blocked on channel operations. |
| /// |
| /// This data structure is used by threads to register blocking operations and get woken up once |
| /// an operation becomes ready. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Waker { |
| <span class="doccomment">/// A list of select operations. |
| </span>selectors: Vec<Entry>, |
| |
| <span class="doccomment">/// A list of operations waiting to be ready. |
| </span>observers: Vec<Entry>, |
| } |
| |
| <span class="kw">impl </span>Waker { |
| <span class="doccomment">/// Creates a new `Waker`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -> <span class="self">Self </span>{ |
| Waker { |
| selectors: Vec::new(), |
| observers: Vec::new(), |
| } |
| } |
| |
| <span class="doccomment">/// Registers a select operation. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>register(<span class="kw-2">&mut </span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&</span>Context) { |
| <span class="self">self</span>.register_with_packet(oper, ptr::null_mut(), cx); |
| } |
| |
| <span class="doccomment">/// Registers a select operation and a packet. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>register_with_packet(<span class="kw-2">&mut </span><span class="self">self</span>, oper: Operation, packet: <span class="kw-2">*mut </span>(), cx: <span class="kw-2">&</span>Context) { |
| <span class="self">self</span>.selectors.push(Entry { |
| oper, |
| packet, |
| cx: cx.clone(), |
| }); |
| } |
| |
| <span class="doccomment">/// Unregisters a select operation. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unregister(<span class="kw-2">&mut </span><span class="self">self</span>, oper: Operation) -> <span class="prelude-ty">Option</span><Entry> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((i, <span class="kw">_</span>)) = <span class="self">self |
| </span>.selectors |
| .iter() |
| .enumerate() |
| .find(|<span class="kw-2">&</span>(<span class="kw">_</span>, entry)| entry.oper == oper) |
| { |
| <span class="kw">let </span>entry = <span class="self">self</span>.selectors.remove(i); |
| <span class="prelude-val">Some</span>(entry) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Attempts to find another thread's entry, select the operation, and wake it up. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>try_select(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Entry> { |
| <span class="kw">if </span><span class="self">self</span>.selectors.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>thread_id = current_thread_id(); |
| |
| <span class="self">self</span>.selectors |
| .iter() |
| .position(|selector| { |
| <span class="comment">// Does the entry belong to a different thread? |
| </span>selector.cx.thread_id() != thread_id |
| && selector <span class="comment">// Try selecting this operation. |
| </span>.cx |
| .try_select(Selected::Operation(selector.oper)) |
| .is_ok() |
| && { |
| <span class="comment">// Provide the packet. |
| </span>selector.cx.store_packet(selector.packet); |
| <span class="comment">// Wake the thread up. |
| </span>selector.cx.unpark(); |
| <span class="bool-val">true |
| </span>} |
| }) |
| <span class="comment">// Remove the entry from the queue to keep it clean and improve |
| // performance. |
| </span>.map(|pos| <span class="self">self</span>.selectors.remove(pos)) |
| } |
| } |
| |
| <span class="doccomment">/// Returns `true` if there is an entry which can be selected by the current thread. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>can_select(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.selectors.is_empty() { |
| <span class="bool-val">false |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>thread_id = current_thread_id(); |
| |
| <span class="self">self</span>.selectors.iter().any(|entry| { |
| entry.cx.thread_id() != thread_id && entry.cx.selected() == Selected::Waiting |
| }) |
| } |
| } |
| |
| <span class="doccomment">/// Registers an operation waiting to be ready. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>watch(<span class="kw-2">&mut </span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&</span>Context) { |
| <span class="self">self</span>.observers.push(Entry { |
| oper, |
| packet: ptr::null_mut(), |
| cx: cx.clone(), |
| }); |
| } |
| |
| <span class="doccomment">/// Unregisters an operation waiting to be ready. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unwatch(<span class="kw-2">&mut </span><span class="self">self</span>, oper: Operation) { |
| <span class="self">self</span>.observers.retain(|e| e.oper != oper); |
| } |
| |
| <span class="doccomment">/// Notifies all operations waiting to be ready. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>notify(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">for </span>entry <span class="kw">in </span><span class="self">self</span>.observers.drain(..) { |
| <span class="kw">if </span>entry.cx.try_select(Selected::Operation(entry.oper)).is_ok() { |
| entry.cx.unpark(); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Notifies all registered operations that the channel is disconnected. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>disconnect(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">for </span>entry <span class="kw">in </span><span class="self">self</span>.selectors.iter() { |
| <span class="kw">if </span>entry.cx.try_select(Selected::Disconnected).is_ok() { |
| <span class="comment">// Wake the thread up. |
| // |
| // Here we don't remove the entry from the queue. Registered threads must |
| // unregister from the waker by themselves. They might also want to recover the |
| // packet value and destroy it, if necessary. |
| </span>entry.cx.unpark(); |
| } |
| } |
| |
| <span class="self">self</span>.notify(); |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Waker { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.selectors.len(), <span class="number">0</span>); |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.observers.len(), <span class="number">0</span>); |
| } |
| } |
| |
| <span class="doccomment">/// A waker that can be shared among threads without locking. |
| /// |
| /// This is a simple wrapper around `Waker` that internally uses a mutex for synchronization. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SyncWaker { |
| <span class="doccomment">/// The inner `Waker`. |
| </span>inner: Mutex<Waker>, |
| |
| <span class="doccomment">/// `true` if the waker is empty. |
| </span>is_empty: AtomicBool, |
| } |
| |
| <span class="kw">impl </span>SyncWaker { |
| <span class="doccomment">/// Creates a new `SyncWaker`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -> <span class="self">Self </span>{ |
| SyncWaker { |
| inner: Mutex::new(Waker::new()), |
| is_empty: AtomicBool::new(<span class="bool-val">true</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Registers the current thread with an operation. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>register(<span class="kw-2">&</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&</span>Context) { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| inner.register(oper, cx); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| } |
| |
| <span class="doccomment">/// Unregisters an operation previously registered by the current thread. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unregister(<span class="kw-2">&</span><span class="self">self</span>, oper: Operation) -> <span class="prelude-ty">Option</span><Entry> { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| <span class="kw">let </span>entry = inner.unregister(oper); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| entry |
| } |
| |
| <span class="doccomment">/// Attempts to find one thread (not the current one), select its operation, and wake it up. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>notify(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">if </span>!<span class="self">self</span>.is_empty.load(Ordering::SeqCst) { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| <span class="kw">if </span>!<span class="self">self</span>.is_empty.load(Ordering::SeqCst) { |
| inner.try_select(); |
| inner.notify(); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Registers an operation waiting to be ready. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>watch(<span class="kw-2">&</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&</span>Context) { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| inner.watch(oper, cx); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| } |
| |
| <span class="doccomment">/// Unregisters an operation waiting to be ready. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unwatch(<span class="kw-2">&</span><span class="self">self</span>, oper: Operation) { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| inner.unwatch(oper); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| } |
| |
| <span class="doccomment">/// Notifies all threads that the channel is disconnected. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>disconnect(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.lock().unwrap(); |
| inner.disconnect(); |
| <span class="self">self</span>.is_empty.store( |
| inner.selectors.is_empty() && inner.observers.is_empty(), |
| Ordering::SeqCst, |
| ); |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>SyncWaker { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.is_empty.load(Ordering::SeqCst)); |
| } |
| } |
| |
| <span class="doccomment">/// Returns the id of the current thread. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>current_thread_id() -> ThreadId { |
| <span class="macro">thread_local! </span>{ |
| <span class="doccomment">/// Cached thread-local id. |
| </span><span class="kw">static </span>THREAD_ID: ThreadId = thread::current().id(); |
| } |
| |
| THREAD_ID |
| .try_with(|id| <span class="kw-2">*</span>id) |
| .unwrap_or_else(|<span class="kw">_</span>| thread::current().id()) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="crossbeam_channel" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
