| <!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/rayon-3b3b152053499ede/a07ce2e/src/iter/panic_fuse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>panic_fuse.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="../../../rayon/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="../../../rayon/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>::plumbing::<span class="kw-2">*</span>; |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::sync::atomic::{AtomicBool, Ordering}; |
| <span class="kw">use </span>std::thread; |
| |
| <span class="doccomment">/// `PanicFuse` is an adaptor that wraps an iterator with a fuse in case |
| /// of panics, to halt all threads as soon as possible. |
| /// |
| /// This struct is created by the [`panic_fuse()`] method on [`ParallelIterator`] |
| /// |
| /// [`panic_fuse()`]: trait.ParallelIterator.html#method.panic_fuse |
| /// [`ParallelIterator`]: trait.ParallelIterator.html |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>PanicFuse<I: ParallelIterator> { |
| base: I, |
| } |
| |
| <span class="doccomment">/// Helper that sets a bool to `true` if dropped while unwinding. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">struct </span>Fuse<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span>AtomicBool); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Drop <span class="kw">for </span>Fuse<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span>thread::panicking() { |
| <span class="self">self</span>.<span class="number">0</span>.store(<span class="bool-val">true</span>, Ordering::Relaxed); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Fuse<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>panicked(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.load(Ordering::Relaxed) |
| } |
| } |
| |
| <span class="kw">impl</span><I> PanicFuse<I> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| { |
| <span class="doccomment">/// Creates a new `PanicFuse` iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I) -> PanicFuse<I> { |
| PanicFuse { base } |
| } |
| } |
| |
| <span class="kw">impl</span><I> ParallelIterator <span class="kw">for </span>PanicFuse<I> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">let </span>panicked = AtomicBool::new(<span class="bool-val">false</span>); |
| <span class="kw">let </span>consumer1 = PanicFuseConsumer { |
| base: consumer, |
| fuse: Fuse(<span class="kw-2">&</span>panicked), |
| }; |
| <span class="self">self</span>.base.drive_unindexed(consumer1) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.base.opt_len() |
| } |
| } |
| |
| <span class="kw">impl</span><I> IndexedParallelIterator <span class="kw">for </span>PanicFuse<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">let </span>panicked = AtomicBool::new(<span class="bool-val">false</span>); |
| <span class="kw">let </span>consumer1 = PanicFuseConsumer { |
| base: consumer, |
| fuse: Fuse(<span class="kw-2">&</span>panicked), |
| }; |
| <span class="self">self</span>.base.drive(consumer1) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">return </span><span class="self">self</span>.base.with_producer(Callback { callback }); |
| |
| <span class="kw">struct </span>Callback<CB> { |
| callback: CB, |
| } |
| |
| <span class="kw">impl</span><T, CB> ProducerCallback<T> <span class="kw">for </span>Callback<CB> |
| <span class="kw">where |
| </span>CB: ProducerCallback<T>, |
| { |
| <span class="kw">type </span>Output = CB::Output; |
| |
| <span class="kw">fn </span>callback<P>(<span class="self">self</span>, base: P) -> CB::Output |
| <span class="kw">where |
| </span>P: Producer<Item = T>, |
| { |
| <span class="kw">let </span>panicked = AtomicBool::new(<span class="bool-val">false</span>); |
| <span class="kw">let </span>producer = PanicFuseProducer { |
| base, |
| fuse: Fuse(<span class="kw-2">&</span>panicked), |
| }; |
| <span class="self">self</span>.callback.callback(producer) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// Producer implementation |
| |
| </span><span class="kw">struct </span>PanicFuseProducer<<span class="lifetime">'a</span>, P> { |
| base: P, |
| fuse: Fuse<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, P> Producer <span class="kw">for </span>PanicFuseProducer<<span class="lifetime">'a</span>, P> |
| <span class="kw">where |
| </span>P: Producer, |
| { |
| <span class="kw">type </span>Item = P::Item; |
| <span class="kw">type </span>IntoIter = PanicFuseIter<<span class="lifetime">'a</span>, P::IntoIter>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| PanicFuseIter { |
| base: <span class="self">self</span>.base.into_iter(), |
| fuse: <span class="self">self</span>.fuse, |
| } |
| } |
| |
| <span class="kw">fn </span>min_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.min_len() |
| } |
| <span class="kw">fn </span>max_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.max_len() |
| } |
| |
| <span class="kw">fn </span>split_at(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>) { |
| <span class="kw">let </span>(left, right) = <span class="self">self</span>.base.split_at(index); |
| ( |
| PanicFuseProducer { |
| base: left, |
| fuse: <span class="self">self</span>.fuse.clone(), |
| }, |
| PanicFuseProducer { |
| base: right, |
| fuse: <span class="self">self</span>.fuse, |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>fold_with<G>(<span class="self">self</span>, folder: G) -> G |
| <span class="kw">where |
| </span>G: Folder<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">let </span>folder1 = PanicFuseFolder { |
| base: folder, |
| fuse: <span class="self">self</span>.fuse, |
| }; |
| <span class="self">self</span>.base.fold_with(folder1).base |
| } |
| } |
| |
| <span class="kw">struct </span>PanicFuseIter<<span class="lifetime">'a</span>, I> { |
| base: I, |
| fuse: Fuse<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> Iterator <span class="kw">for </span>PanicFuseIter<<span class="lifetime">'a</span>, I> |
| <span class="kw">where |
| </span>I: Iterator, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">if </span><span class="self">self</span>.fuse.panicked() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.base.next() |
| } |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="self">self</span>.base.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> DoubleEndedIterator <span class="kw">for </span>PanicFuseIter<<span class="lifetime">'a</span>, I> |
| <span class="kw">where |
| </span>I: DoubleEndedIterator, |
| { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">if </span><span class="self">self</span>.fuse.panicked() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.base.next_back() |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> ExactSizeIterator <span class="kw">for </span>PanicFuseIter<<span class="lifetime">'a</span>, I> |
| <span class="kw">where |
| </span>I: ExactSizeIterator, |
| { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.len() |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// Consumer implementation |
| |
| </span><span class="kw">struct </span>PanicFuseConsumer<<span class="lifetime">'a</span>, C> { |
| base: C, |
| fuse: Fuse<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, C> Consumer<T> <span class="kw">for </span>PanicFuseConsumer<<span class="lifetime">'a</span>, C> |
| <span class="kw">where |
| </span>C: Consumer<T>, |
| { |
| <span class="kw">type </span>Folder = PanicFuseFolder<<span class="lifetime">'a</span>, C::Folder>; |
| <span class="kw">type </span>Reducer = PanicFuseReducer<<span class="lifetime">'a</span>, C::Reducer>; |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result; |
| |
| <span class="kw">fn </span>split_at(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) { |
| <span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index); |
| ( |
| PanicFuseConsumer { |
| base: left, |
| fuse: <span class="self">self</span>.fuse.clone(), |
| }, |
| PanicFuseConsumer { |
| base: right, |
| fuse: <span class="self">self</span>.fuse.clone(), |
| }, |
| PanicFuseReducer { |
| base: reducer, |
| _fuse: <span class="self">self</span>.fuse, |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| PanicFuseFolder { |
| base: <span class="self">self</span>.base.into_folder(), |
| fuse: <span class="self">self</span>.fuse, |
| } |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.fuse.panicked() || <span class="self">self</span>.base.full() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, C> UnindexedConsumer<T> <span class="kw">for </span>PanicFuseConsumer<<span class="lifetime">'a</span>, C> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<T>, |
| { |
| <span class="kw">fn </span>split_off_left(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| PanicFuseConsumer { |
| base: <span class="self">self</span>.base.split_off_left(), |
| fuse: <span class="self">self</span>.fuse.clone(), |
| } |
| } |
| |
| <span class="kw">fn </span>to_reducer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Reducer { |
| PanicFuseReducer { |
| base: <span class="self">self</span>.base.to_reducer(), |
| _fuse: <span class="self">self</span>.fuse.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>PanicFuseFolder<<span class="lifetime">'a</span>, C> { |
| base: C, |
| fuse: Fuse<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, C> Folder<T> <span class="kw">for </span>PanicFuseFolder<<span class="lifetime">'a</span>, C> |
| <span class="kw">where |
| </span>C: Folder<T>, |
| { |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result; |
| |
| <span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: T) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.base = <span class="self">self</span>.base.consume(item); |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>consume_iter<I>(<span class="kw-2">mut </span><span class="self">self</span>, iter: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoIterator<Item = T>, |
| { |
| <span class="kw">fn </span>cool<<span class="lifetime">'a</span>, T>(fuse: <span class="kw-2">&</span><span class="lifetime">'a </span>Fuse<<span class="lifetime">'_</span>>) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span>T) -> bool + <span class="lifetime">'a </span>{ |
| <span class="kw">move </span>|<span class="kw">_</span>| !fuse.panicked() |
| } |
| |
| <span class="self">self</span>.base = { |
| <span class="kw">let </span>fuse = <span class="kw-2">&</span><span class="self">self</span>.fuse; |
| <span class="kw">let </span>iter = iter.into_iter().take_while(cool(fuse)); |
| <span class="self">self</span>.base.consume_iter(iter) |
| }; |
| <span class="self">self |
| </span>} |
| |
| <span class="kw">fn </span>complete(<span class="self">self</span>) -> C::Result { |
| <span class="self">self</span>.base.complete() |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.fuse.panicked() || <span class="self">self</span>.base.full() |
| } |
| } |
| |
| <span class="kw">struct </span>PanicFuseReducer<<span class="lifetime">'a</span>, C> { |
| base: C, |
| _fuse: Fuse<<span class="lifetime">'a</span>>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, C> Reducer<T> <span class="kw">for </span>PanicFuseReducer<<span class="lifetime">'a</span>, C> |
| <span class="kw">where |
| </span>C: Reducer<T>, |
| { |
| <span class="kw">fn </span>reduce(<span class="self">self</span>, left: T, right: T) -> T { |
| <span class="self">self</span>.base.reduce(left, right) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rayon" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
