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 <!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/rayon-core/src/registry.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>registry.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_core/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_core/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>::job::{JobFifo, JobRef, StackJob};
 <span class="kw">use </span><span class="kw">crate</span>::latch::{AsCoreLatch, CoreLatch, CountLatch, Latch, LatchRef, LockLatch, SpinLatch};
 <span class="kw">use </span><span class="kw">crate</span>::log::Event::<span class="kw-2">*</span>;
 <span class="kw">use </span><span class="kw">crate</span>::log::Logger;
 <span class="kw">use </span><span class="kw">crate</span>::sleep::Sleep;
 <span class="kw">use </span><span class="kw">crate</span>::unwind;
 <span class="kw">use crate</span>::{
     ErrorKind, ExitHandler, PanicHandler, StartHandler, ThreadPoolBuildError, ThreadPoolBuilder,
     Yield,
 };
 <span class="kw">use </span>crossbeam_deque::{Injector, Steal, Stealer, Worker};
 <span class="kw">use </span>std::cell::Cell;
 <span class="kw">use </span>std::collections::hash_map::DefaultHasher;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::hash::Hasher;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::ptr;
 <span class="kw">use </span>std::sync::atomic::{AtomicUsize, Ordering};
 <span class="kw">use </span>std::sync::{Arc, Mutex, Once};
 <span class="kw">use </span>std::thread;
 <span class="kw">use </span>std::usize;

 <span class="doccomment">/// Thread builder used for customization via
 /// [`ThreadPoolBuilder::spawn_handler`](struct.ThreadPoolBuilder.html#method.spawn_handler).
 </span><span class="kw">pub struct </span>ThreadBuilder {
     name: <span class="prelude-ty">Option</span>&lt;String&gt;,
     stack_size: <span class="prelude-ty">Option</span>&lt;usize&gt;,
     worker: Worker&lt;JobRef&gt;,
     stealer: Stealer&lt;JobRef&gt;,
     registry: Arc&lt;Registry&gt;,
     index: usize,
 }

 <span class="kw">impl </span>ThreadBuilder {
     <span class="doccomment">/// Gets the index of this thread in the pool, within `0..num_threads`.
     </span><span class="kw">pub fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.index
     }

     <span class="doccomment">/// Gets the string that was specified by `ThreadPoolBuilder::name()`.
     </span><span class="kw">pub fn </span>name(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>str&gt; {
         <span class="self">self</span>.name.as_deref()
     }

     <span class="doccomment">/// Gets the value that was specified by `ThreadPoolBuilder::stack_size()`.
     </span><span class="kw">pub fn </span>stack_size(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="self">self</span>.stack_size
     }

     <span class="doccomment">/// Executes the main loop for this thread. This will not return until the
     /// thread pool is dropped.
     </span><span class="kw">pub fn </span>run(<span class="self">self</span>) {
         <span class="kw">unsafe </span>{ main_loop(<span class="self">self</span>) }
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ThreadBuilder {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;ThreadBuilder&quot;</span>)
             .field(<span class="string">&quot;pool&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.registry.id())
             .field(<span class="string">&quot;index&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.index)
             .field(<span class="string">&quot;name&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.name)
             .field(<span class="string">&quot;stack_size&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.stack_size)
             .finish()
     }
 }

 <span class="doccomment">/// Generalized trait for spawning a thread in the `Registry`.
 ///
 /// This trait is pub-in-private -- E0445 forces us to make it public,
 /// but we don&#39;t actually want to expose these details in the API.
 </span><span class="kw">pub trait </span>ThreadSpawn {
     <span class="macro">private_decl! </span>{}

     <span class="doccomment">/// Spawn a thread with the `ThreadBuilder` parameters, and then
     /// call `ThreadBuilder::run()`.
     </span><span class="kw">fn </span>spawn(<span class="kw-2">&amp;mut </span><span class="self">self</span>, thread: ThreadBuilder) -&gt; io::Result&lt;()&gt;;
 }

 <span class="doccomment">/// Spawns a thread in the &quot;normal&quot; way with `std::thread::Builder`.
 ///
 /// This type is pub-in-private -- E0445 forces us to make it public,
 /// but we don&#39;t actually want to expose these details in the API.
 </span><span class="attribute">#[derive(Debug, Default)]
 </span><span class="kw">pub struct </span>DefaultSpawn;

 <span class="kw">impl </span>ThreadSpawn <span class="kw">for </span>DefaultSpawn {
     <span class="macro">private_impl! </span>{}

     <span class="kw">fn </span>spawn(<span class="kw-2">&amp;mut </span><span class="self">self</span>, thread: ThreadBuilder) -&gt; io::Result&lt;()&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>b = thread::Builder::new();
         <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = thread.name() {
             b = b.name(name.to_owned());
         }
         <span class="kw">if let </span><span class="prelude-val">Some</span>(stack_size) = thread.stack_size() {
             b = b.stack_size(stack_size);
         }
         b.spawn(|| thread.run())<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="doccomment">/// Spawns a thread with a user&#39;s custom callback.
 ///
 /// This type is pub-in-private -- E0445 forces us to make it public,
 /// but we don&#39;t actually want to expose these details in the API.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>CustomSpawn&lt;F&gt;(F);

 <span class="kw">impl</span>&lt;F&gt; CustomSpawn&lt;F&gt;
 <span class="kw">where
     </span>F: FnMut(ThreadBuilder) -&gt; io::Result&lt;()&gt;,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(spawn: F) -&gt; <span class="self">Self </span>{
         CustomSpawn(spawn)
     }
 }

 <span class="kw">impl</span>&lt;F&gt; ThreadSpawn <span class="kw">for </span>CustomSpawn&lt;F&gt;
 <span class="kw">where
     </span>F: FnMut(ThreadBuilder) -&gt; io::Result&lt;()&gt;,
 {
     <span class="macro">private_impl! </span>{}

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>spawn(<span class="kw-2">&amp;mut </span><span class="self">self</span>, thread: ThreadBuilder) -&gt; io::Result&lt;()&gt; {
         (<span class="self">self</span>.<span class="number">0</span>)(thread)
     }
 }

 <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Registry {
     logger: Logger,
     thread_infos: Vec&lt;ThreadInfo&gt;,
     sleep: Sleep,
     injected_jobs: Injector&lt;JobRef&gt;,
     broadcasts: Mutex&lt;Vec&lt;Worker&lt;JobRef&gt;&gt;&gt;,
     panic_handler: <span class="prelude-ty">Option</span>&lt;Box&lt;PanicHandler&gt;&gt;,
     start_handler: <span class="prelude-ty">Option</span>&lt;Box&lt;StartHandler&gt;&gt;,
     exit_handler: <span class="prelude-ty">Option</span>&lt;Box&lt;ExitHandler&gt;&gt;,

     <span class="comment">// When this latch reaches 0, it means that all work on this
     // registry must be complete. This is ensured in the following ways:
     //
     // - if this is the global registry, there is a ref-count that never
     //   gets released.
     // - if this is a user-created thread-pool, then so long as the thread-pool
     //   exists, it holds a reference.
     // - when we inject a &quot;blocking job&quot; into the registry with `ThreadPool::install()`,
     //   no adjustment is needed; the `ThreadPool` holds the reference, and since we won&#39;t
     //   return until the blocking job is complete, that ref will continue to be held.
     // - when `join()` or `scope()` is invoked, similarly, no adjustments are needed.
     //   These are always owned by some other job (e.g., one injected by `ThreadPool::install()`)
     //   and that job will keep the pool alive.
     </span>terminate_count: AtomicUsize,
 }

 <span class="doccomment">/// ////////////////////////////////////////////////////////////////////////
 /// Initialization

 </span><span class="kw">static </span><span class="kw-2">mut </span>THE_REGISTRY: <span class="prelude-ty">Option</span>&lt;Arc&lt;Registry&gt;&gt; = <span class="prelude-val">None</span>;
 <span class="kw">static </span>THE_REGISTRY_SET: Once = Once::new();

 <span class="doccomment">/// Starts the worker threads (if that has not already happened). If
 /// initialization has not already occurred, use the default
 /// configuration.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>global_registry() -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Arc&lt;Registry&gt; {
     set_global_registry(default_global_registry)
         .or_else(|err| <span class="kw">unsafe </span>{ THE_REGISTRY.as_ref().ok_or(err) })
         .expect(<span class="string">&quot;The global thread pool has not been initialized.&quot;</span>)
 }

 <span class="doccomment">/// Starts the worker threads (if that has not already happened) with
 /// the given builder.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>init_global_registry&lt;S&gt;(
     builder: ThreadPoolBuilder&lt;S&gt;,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Arc&lt;Registry&gt;, ThreadPoolBuildError&gt;
 <span class="kw">where
     </span>S: ThreadSpawn,
 {
     set_global_registry(|| Registry::new(builder))
 }

 <span class="doccomment">/// Starts the worker threads (if that has not already happened)
 /// by creating a registry with the given callback.
 </span><span class="kw">fn </span>set_global_registry&lt;F&gt;(registry: F) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>Arc&lt;Registry&gt;, ThreadPoolBuildError&gt;
 <span class="kw">where
     </span>F: FnOnce() -&gt; <span class="prelude-ty">Result</span>&lt;Arc&lt;Registry&gt;, ThreadPoolBuildError&gt;,
 {
     <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="prelude-val">Err</span>(ThreadPoolBuildError::new(
         ErrorKind::GlobalPoolAlreadyInitialized,
     ));

     THE_REGISTRY_SET.call_once(|| {
         result = registry()
             .map(|registry: Arc&lt;Registry&gt;| <span class="kw">unsafe </span>{ <span class="kw-2">&amp;*</span>THE_REGISTRY.get_or_insert(registry) })
     });

     result
 }

 <span class="kw">fn </span>default_global_registry() -&gt; <span class="prelude-ty">Result</span>&lt;Arc&lt;Registry&gt;, ThreadPoolBuildError&gt; {
     <span class="kw">let </span>result = Registry::new(ThreadPoolBuilder::new());

     <span class="comment">// If we&#39;re running in an environment that doesn&#39;t support threads at all, we can fall back to
     // using the current thread alone. This is crude, and probably won&#39;t work for non-blocking
     // calls like `spawn` or `broadcast_spawn`, but a lot of stuff does work fine.
     //
     // Notably, this allows current WebAssembly targets to work even though their threading support
     // is stubbed out, and we won&#39;t have to change anything if they do add real threading.
     </span><span class="kw">let </span>unsupported = <span class="macro">matches!</span>(<span class="kw-2">&amp;</span>result, <span class="prelude-val">Err</span>(e) <span class="kw">if </span>e.is_unsupported());
     <span class="kw">if </span>unsupported &amp;&amp; WorkerThread::current().is_null() {
         <span class="kw">let </span>builder = ThreadPoolBuilder::new()
             .num_threads(<span class="number">1</span>)
             .spawn_handler(|thread| {
                 <span class="comment">// Rather than starting a new thread, we&#39;re just taking over the current thread
                 // *without* running the main loop, so we can still return from here.
                 // The WorkerThread is leaked, but we never shutdown the global pool anyway.
                 </span><span class="kw">let </span>worker_thread = Box::leak(Box::new(WorkerThread::from(thread)));
                 <span class="kw">let </span>registry = <span class="kw-2">&amp;*</span>worker_thread.registry;
                 <span class="kw">let </span>index = worker_thread.index;

                 <span class="kw">unsafe </span>{
                     WorkerThread::set_current(worker_thread);

                     <span class="comment">// let registry know we are ready to do work
                     </span>Latch::set(<span class="kw-2">&amp;</span>registry.thread_infos[index].primed);
                 }

                 <span class="prelude-val">Ok</span>(())
             });

         <span class="kw">let </span>fallback_result = Registry::new(builder);
         <span class="kw">if </span>fallback_result.is_ok() {
             <span class="kw">return </span>fallback_result;
         }
     }

     result
 }

 <span class="kw">struct </span>Terminator&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Arc&lt;Registry&gt;);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Terminator&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.<span class="number">0</span>.terminate()
     }
 }

 <span class="kw">impl </span>Registry {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new&lt;S&gt;(
         <span class="kw-2">mut </span>builder: ThreadPoolBuilder&lt;S&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Arc&lt;<span class="self">Self</span>&gt;, ThreadPoolBuildError&gt;
     <span class="kw">where
         </span>S: ThreadSpawn,
     {
         <span class="comment">// Soft-limit the number of threads that we can actually support.
         </span><span class="kw">let </span>n_threads = Ord::min(builder.get_num_threads(), <span class="kw">crate</span>::max_num_threads());

         <span class="kw">let </span>breadth_first = builder.get_breadth_first();

         <span class="kw">let </span>(workers, stealers): (Vec&lt;<span class="kw">_</span>&gt;, Vec&lt;<span class="kw">_</span>&gt;) = (<span class="number">0</span>..n_threads)
             .map(|<span class="kw">_</span>| {
                 <span class="kw">let </span>worker = <span class="kw">if </span>breadth_first {
                     Worker::new_fifo()
                 } <span class="kw">else </span>{
                     Worker::new_lifo()
                 };

                 <span class="kw">let </span>stealer = worker.stealer();
                 (worker, stealer)
             })
             .unzip();

         <span class="kw">let </span>(broadcasts, broadcast_stealers): (Vec&lt;<span class="kw">_</span>&gt;, Vec&lt;<span class="kw">_</span>&gt;) = (<span class="number">0</span>..n_threads)
             .map(|<span class="kw">_</span>| {
                 <span class="kw">let </span>worker = Worker::new_fifo();
                 <span class="kw">let </span>stealer = worker.stealer();
                 (worker, stealer)
             })
             .unzip();

         <span class="kw">let </span>logger = Logger::new(n_threads);
         <span class="kw">let </span>registry = Arc::new(Registry {
             logger: logger.clone(),
             thread_infos: stealers.into_iter().map(ThreadInfo::new).collect(),
             sleep: Sleep::new(logger, n_threads),
             injected_jobs: Injector::new(),
             broadcasts: Mutex::new(broadcasts),
             terminate_count: AtomicUsize::new(<span class="number">1</span>),
             panic_handler: builder.take_panic_handler(),
             start_handler: builder.take_start_handler(),
             exit_handler: builder.take_exit_handler(),
         });

         <span class="comment">// If we return early or panic, make sure to terminate existing threads.
         </span><span class="kw">let </span>t1000 = Terminator(<span class="kw-2">&amp;</span>registry);

         <span class="kw">for </span>(index, (worker, stealer)) <span class="kw">in </span>workers.into_iter().zip(broadcast_stealers).enumerate() {
             <span class="kw">let </span>thread = ThreadBuilder {
                 name: builder.get_thread_name(index),
                 stack_size: builder.get_stack_size(),
                 registry: Arc::clone(<span class="kw-2">&amp;</span>registry),
                 worker,
                 stealer,
                 index,
             };
             <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = builder.get_spawn_handler().spawn(thread) {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(ThreadPoolBuildError::new(ErrorKind::IOError(e)));
             }
         }

         <span class="comment">// Returning normally now, without termination.
         </span>mem::forget(t1000);

         <span class="prelude-val">Ok</span>(registry)
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>current() -&gt; Arc&lt;Registry&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>worker_thread = WorkerThread::current();
             <span class="kw">let </span>registry = <span class="kw">if </span>worker_thread.is_null() {
                 global_registry()
             } <span class="kw">else </span>{
                 <span class="kw-2">&amp;</span>(<span class="kw-2">*</span>worker_thread).registry
             };
             Arc::clone(registry)
         }
     }

     <span class="doccomment">/// Returns the number of threads in the current registry.  This
     /// is better than `Registry::current().num_threads()` because it
     /// avoids incrementing the `Arc`.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>current_num_threads() -&gt; usize {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>worker_thread = WorkerThread::current();
             <span class="kw">if </span>worker_thread.is_null() {
                 global_registry().num_threads()
             } <span class="kw">else </span>{
                 (<span class="kw-2">*</span>worker_thread).registry.num_threads()
             }
         }
     }

     <span class="doccomment">/// Returns the current `WorkerThread` if it&#39;s part of this `Registry`.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>current_thread(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>WorkerThread&gt; {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>worker = WorkerThread::current().as_ref()<span class="question-mark">?</span>;
             <span class="kw">if </span>worker.registry().id() == <span class="self">self</span>.id() {
                 <span class="prelude-val">Some</span>(worker)
             } <span class="kw">else </span>{
                 <span class="prelude-val">None
             </span>}
         }
     }

     <span class="doccomment">/// Returns an opaque identifier for this registry.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; RegistryId {
         <span class="comment">// We can rely on `self` not to change since we only ever create
         // registries that are boxed up in an `Arc` (see `new()` above).
         </span>RegistryId {
             addr: <span class="self">self </span><span class="kw">as </span><span class="kw-2">*const </span><span class="self">Self </span><span class="kw">as </span>usize,
         }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, event: <span class="kw">impl </span>FnOnce() -&gt; <span class="kw">crate</span>::log::Event) {
         <span class="self">self</span>.logger.log(event)
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>num_threads(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.thread_infos.len()
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>catch_unwind(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce()) {
         <span class="kw">if let </span><span class="prelude-val">Err</span>(err) = unwind::halt_unwinding(f) {
             <span class="comment">// If there is no handler, or if that handler itself panics, then we abort.
             </span><span class="kw">let </span>abort_guard = unwind::AbortIfPanic;
             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>handler) = <span class="self">self</span>.panic_handler {
                 handler(err);
                 mem::forget(abort_guard);
             }
         }
     }

     <span class="doccomment">/// Waits for the worker threads to get up and running.  This is
     /// meant to be used for benchmarking purposes, primarily, so that
     /// you can get more consistent numbers by having everything
     /// &quot;ready to go&quot;.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>wait_until_primed(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">for </span>info <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.thread_infos {
             info.primed.wait();
         }
     }

     <span class="doccomment">/// Waits for the worker threads to stop. This is used for testing
     /// -- so we can check that termination actually works.
     </span><span class="attribute">#[cfg(test)]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>wait_until_stopped(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">for </span>info <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.thread_infos {
             info.stopped.wait();
         }
     }

     <span class="doccomment">/// ////////////////////////////////////////////////////////////////////////
     /// MAIN LOOP
     ///
     /// So long as all of the worker threads are hanging out in their
     /// top-level loop, there is no work to be done.

     /// Push a job into the given `registry`. If we are running on a
     /// worker thread for the registry, this will push onto the
     /// deque. Else, it will inject from the outside (which is slower).
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inject_or_push(<span class="kw-2">&amp;</span><span class="self">self</span>, job_ref: JobRef) {
         <span class="kw">let </span>worker_thread = WorkerThread::current();
         <span class="kw">unsafe </span>{
             <span class="kw">if </span>!worker_thread.is_null() &amp;&amp; (<span class="kw-2">*</span>worker_thread).registry().id() == <span class="self">self</span>.id() {
                 (<span class="kw-2">*</span>worker_thread).push(job_ref);
             } <span class="kw">else </span>{
                 <span class="self">self</span>.inject(job_ref);
             }
         }
     }

     <span class="doccomment">/// Push a job into the &quot;external jobs&quot; queue; it will be taken by
     /// whatever worker has nothing to do. Use this if you know that
     /// you are not on a worker of this registry.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inject(<span class="kw-2">&amp;</span><span class="self">self</span>, injected_job: JobRef) {
         <span class="self">self</span>.log(|| JobsInjected { count: <span class="number">1 </span>});

         <span class="comment">// It should not be possible for `state.terminate` to be true
         // here. It is only set to true when the user creates (and
         // drops) a `ThreadPool`; and, in that case, they cannot be
         // calling `inject()` later, since they dropped their
         // `ThreadPool`.
         </span><span class="macro">debug_assert_ne!</span>(
             <span class="self">self</span>.terminate_count.load(Ordering::Acquire),
             <span class="number">0</span>,
             <span class="string">&quot;inject() sees state.terminate as true&quot;
         </span>);

         <span class="kw">let </span>queue_was_empty = <span class="self">self</span>.injected_jobs.is_empty();

         <span class="self">self</span>.injected_jobs.push(injected_job);
         <span class="self">self</span>.sleep.new_injected_jobs(usize::MAX, <span class="number">1</span>, queue_was_empty);
     }

     <span class="kw">fn </span>has_injected_job(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         !<span class="self">self</span>.injected_jobs.is_empty()
     }

     <span class="kw">fn </span>pop_injected_job(<span class="kw-2">&amp;</span><span class="self">self</span>, worker_index: usize) -&gt; <span class="prelude-ty">Option</span>&lt;JobRef&gt; {
         <span class="kw">loop </span>{
             <span class="kw">match </span><span class="self">self</span>.injected_jobs.steal() {
                 Steal::Success(job) =&gt; {
                     <span class="self">self</span>.log(|| JobUninjected {
                         worker: worker_index,
                     });
                     <span class="kw">return </span><span class="prelude-val">Some</span>(job);
                 }
                 Steal::Empty =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
                 Steal::Retry =&gt; {}
             }
         }
     }

     <span class="doccomment">/// Push a job into each thread&#39;s own &quot;external jobs&quot; queue; it will be
     /// executed only on that thread, when it has nothing else to do locally,
     /// before it tries to steal other work.
     ///
     /// **Panics** if not given exactly as many jobs as there are threads.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inject_broadcast(<span class="kw-2">&amp;</span><span class="self">self</span>, injected_jobs: <span class="kw">impl </span>ExactSizeIterator&lt;Item = JobRef&gt;) {
         <span class="macro">assert_eq!</span>(<span class="self">self</span>.num_threads(), injected_jobs.len());
         <span class="self">self</span>.log(|| JobBroadcast {
             count: <span class="self">self</span>.num_threads(),
         });
         {
             <span class="kw">let </span>broadcasts = <span class="self">self</span>.broadcasts.lock().unwrap();

             <span class="comment">// It should not be possible for `state.terminate` to be true
             // here. It is only set to true when the user creates (and
             // drops) a `ThreadPool`; and, in that case, they cannot be
             // calling `inject_broadcast()` later, since they dropped their
             // `ThreadPool`.
             </span><span class="macro">debug_assert_ne!</span>(
                 <span class="self">self</span>.terminate_count.load(Ordering::Acquire),
                 <span class="number">0</span>,
                 <span class="string">&quot;inject_broadcast() sees state.terminate as true&quot;
             </span>);

             <span class="macro">assert_eq!</span>(broadcasts.len(), injected_jobs.len());
             <span class="kw">for </span>(worker, job_ref) <span class="kw">in </span>broadcasts.iter().zip(injected_jobs) {
                 worker.push(job_ref);
             }
         }
         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="self">self</span>.num_threads() {
             <span class="self">self</span>.sleep.notify_worker_latch_is_set(i);
         }
     }

     <span class="doccomment">/// If already in a worker-thread of this registry, just execute `op`.
     /// Otherwise, inject `op` in this thread-pool. Either way, block until `op`
     /// completes and return its return value. If `op` panics, that panic will
     /// be propagated as well.  The second argument indicates `true` if injection
     /// was performed, `false` if executed directly.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>in_worker&lt;OP, R&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, op: OP) -&gt; R
     <span class="kw">where
         </span>OP: FnOnce(<span class="kw-2">&amp;</span>WorkerThread, bool) -&gt; R + Send,
         R: Send,
     {
         <span class="kw">unsafe </span>{
             <span class="kw">let </span>worker_thread = WorkerThread::current();
             <span class="kw">if </span>worker_thread.is_null() {
                 <span class="self">self</span>.in_worker_cold(op)
             } <span class="kw">else if </span>(<span class="kw-2">*</span>worker_thread).registry().id() != <span class="self">self</span>.id() {
                 <span class="self">self</span>.in_worker_cross(<span class="kw-2">&amp;*</span>worker_thread, op)
             } <span class="kw">else </span>{
                 <span class="comment">// Perfectly valid to give them a `&amp;T`: this is the
                 // current thread, so we know the data structure won&#39;t be
                 // invalidated until we return.
                 </span>op(<span class="kw-2">&amp;*</span>worker_thread, <span class="bool-val">false</span>)
             }
         }
     }

     <span class="attribute">#[cold]
     </span><span class="kw">unsafe fn </span>in_worker_cold&lt;OP, R&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, op: OP) -&gt; R
     <span class="kw">where
         </span>OP: FnOnce(<span class="kw-2">&amp;</span>WorkerThread, bool) -&gt; R + Send,
         R: Send,
     {
         <span class="macro">thread_local!</span>(<span class="kw">static </span>LOCK_LATCH: LockLatch = LockLatch::new());

         LOCK_LATCH.with(|l| {
             <span class="comment">// This thread isn&#39;t a member of *any* thread pool, so just block.
             </span><span class="macro">debug_assert!</span>(WorkerThread::current().is_null());
             <span class="kw">let </span>job = StackJob::new(
                 |injected| {
                     <span class="kw">let </span>worker_thread = WorkerThread::current();
                     <span class="macro">assert!</span>(injected &amp;&amp; !worker_thread.is_null());
                     op(<span class="kw-2">&amp;*</span>worker_thread, <span class="bool-val">true</span>)
                 },
                 LatchRef::new(l),
             );
             <span class="self">self</span>.inject(job.as_job_ref());
             job.latch.wait_and_reset(); <span class="comment">// Make sure we can use the same latch again next time.

             // flush accumulated logs as we exit the thread
             </span><span class="self">self</span>.logger.log(|| Flush);

             job.into_result()
         })
     }

     <span class="attribute">#[cold]
     </span><span class="kw">unsafe fn </span>in_worker_cross&lt;OP, R&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, current_thread: <span class="kw-2">&amp;</span>WorkerThread, op: OP) -&gt; R
     <span class="kw">where
         </span>OP: FnOnce(<span class="kw-2">&amp;</span>WorkerThread, bool) -&gt; R + Send,
         R: Send,
     {
         <span class="comment">// This thread is a member of a different pool, so let it process
         // other work while waiting for this `op` to complete.
         </span><span class="macro">debug_assert!</span>(current_thread.registry().id() != <span class="self">self</span>.id());
         <span class="kw">let </span>latch = SpinLatch::cross(current_thread);
         <span class="kw">let </span>job = StackJob::new(
             |injected| {
                 <span class="kw">let </span>worker_thread = WorkerThread::current();
                 <span class="macro">assert!</span>(injected &amp;&amp; !worker_thread.is_null());
                 op(<span class="kw-2">&amp;*</span>worker_thread, <span class="bool-val">true</span>)
             },
             latch,
         );
         <span class="self">self</span>.inject(job.as_job_ref());
         current_thread.wait_until(<span class="kw-2">&amp;</span>job.latch);
         job.into_result()
     }

     <span class="doccomment">/// Increments the terminate counter. This increment should be
     /// balanced by a call to `terminate`, which will decrement. This
     /// is used when spawning asynchronous work, which needs to
     /// prevent the registry from terminating so long as it is active.
     ///
     /// Note that blocking functions such as `join` and `scope` do not
     /// need to concern themselves with this fn; their context is
     /// responsible for ensuring the current thread-pool will not
     /// terminate until they return.
     ///
     /// The global thread-pool always has an outstanding reference
     /// (the initial one). Custom thread-pools have one outstanding
     /// reference that is dropped when the `ThreadPool` is dropped:
     /// since installing the thread-pool blocks until any joins/scopes
     /// complete, this ensures that joins/scopes are covered.
     ///
     /// The exception is `::spawn()`, which can create a job outside
     /// of any blocking scope. In that case, the job itself holds a
     /// terminate count and is responsible for invoking `terminate()`
     /// when finished.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>increment_terminate_count(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">let </span>previous = <span class="self">self</span>.terminate_count.fetch_add(<span class="number">1</span>, Ordering::AcqRel);
         <span class="macro">debug_assert!</span>(previous != <span class="number">0</span>, <span class="string">&quot;registry ref count incremented from zero&quot;</span>);
         <span class="macro">assert!</span>(
             previous != std::usize::MAX,
             <span class="string">&quot;overflow in registry ref count&quot;
         </span>);
     }

     <span class="doccomment">/// Signals that the thread-pool which owns this registry has been
     /// dropped. The worker threads will gradually terminate, once any
     /// extant work is completed.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>terminate(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="kw">if </span><span class="self">self</span>.terminate_count.fetch_sub(<span class="number">1</span>, Ordering::AcqRel) == <span class="number">1 </span>{
             <span class="kw">for </span>(i, thread_info) <span class="kw">in </span><span class="self">self</span>.thread_infos.iter().enumerate() {
                 <span class="kw">unsafe </span>{ CountLatch::set_and_tickle_one(<span class="kw-2">&amp;</span>thread_info.terminate, <span class="self">self</span>, i) };
             }
         }
     }

     <span class="doccomment">/// Notify the worker that the latch they are sleeping on has been &quot;set&quot;.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>notify_worker_latch_is_set(<span class="kw-2">&amp;</span><span class="self">self</span>, target_worker_index: usize) {
         <span class="self">self</span>.sleep.notify_worker_latch_is_set(target_worker_index);
     }
 }

 <span class="attribute">#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>RegistryId {
     addr: usize,
 }

 <span class="kw">struct </span>ThreadInfo {
     <span class="doccomment">/// Latch set once thread has started and we are entering into the
     /// main loop. Used to wait for worker threads to become primed,
     /// primarily of interest for benchmarking.
     </span>primed: LockLatch,

     <span class="doccomment">/// Latch is set once worker thread has completed. Used to wait
     /// until workers have stopped; only used for tests.
     </span>stopped: LockLatch,

     <span class="doccomment">/// The latch used to signal that terminated has been requested.
     /// This latch is *set* by the `terminate` method on the
     /// `Registry`, once the registry&#39;s main &quot;terminate&quot; counter
     /// reaches zero.
     ///
     /// NB. We use a `CountLatch` here because it has no lifetimes and is
     /// meant for async use, but the count never gets higher than one.
     </span>terminate: CountLatch,

     <span class="doccomment">/// the &quot;stealer&quot; half of the worker&#39;s deque
     </span>stealer: Stealer&lt;JobRef&gt;,
 }

 <span class="kw">impl </span>ThreadInfo {
     <span class="kw">fn </span>new(stealer: Stealer&lt;JobRef&gt;) -&gt; ThreadInfo {
         ThreadInfo {
             primed: LockLatch::new(),
             stopped: LockLatch::new(),
             terminate: CountLatch::new(),
             stealer,
         }
     }
 }

 <span class="doccomment">/// ////////////////////////////////////////////////////////////////////////
 /// WorkerThread identifiers

 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>WorkerThread {
     <span class="doccomment">/// the &quot;worker&quot; half of our local deque
     </span>worker: Worker&lt;JobRef&gt;,

     <span class="doccomment">/// the &quot;stealer&quot; half of the worker&#39;s broadcast deque
     </span>stealer: Stealer&lt;JobRef&gt;,

     <span class="doccomment">/// local queue used for `spawn_fifo` indirection
     </span>fifo: JobFifo,

     index: usize,

     <span class="doccomment">/// A weak random number generator.
     </span>rng: XorShift64Star,

     registry: Arc&lt;Registry&gt;,
 }

 <span class="comment">// This is a bit sketchy, but basically: the WorkerThread is
 // allocated on the stack of the worker on entry and stored into this
 // thread local variable. So it will remain valid at least until the
 // worker is fully unwound. Using an unsafe pointer avoids the need
 // for a RefCell&lt;T&gt; etc.
 </span><span class="macro">thread_local! </span>{
     <span class="kw">static </span>WORKER_THREAD_STATE: Cell&lt;<span class="kw-2">*const </span>WorkerThread&gt; = <span class="kw">const </span>{ Cell::new(ptr::null()) };
 }

 <span class="kw">impl </span>From&lt;ThreadBuilder&gt; <span class="kw">for </span>WorkerThread {
     <span class="kw">fn </span>from(thread: ThreadBuilder) -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             worker: thread.worker,
             stealer: thread.stealer,
             fifo: JobFifo::new(),
             index: thread.index,
             rng: XorShift64Star::new(),
             registry: thread.registry,
         }
     }
 }

 <span class="kw">impl </span>Drop <span class="kw">for </span>WorkerThread {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="comment">// Undo `set_current`
         </span>WORKER_THREAD_STATE.with(|t| {
             <span class="macro">assert!</span>(t.get().eq(<span class="kw-2">&amp;</span>(<span class="self">self </span><span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_</span>)));
             t.set(ptr::null());
         });
     }
 }

 <span class="kw">impl </span>WorkerThread {
     <span class="doccomment">/// Gets the `WorkerThread` index for the current thread; returns
     /// NULL if this is not a worker thread. This pointer is valid
     /// anywhere on the current thread.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>current() -&gt; <span class="kw-2">*const </span>WorkerThread {
         WORKER_THREAD_STATE.with(Cell::get)
     }

     <span class="doccomment">/// Sets `self` as the worker thread index for the current thread.
     /// This is done during worker thread startup.
     </span><span class="kw">unsafe fn </span>set_current(thread: <span class="kw-2">*const </span>WorkerThread) {
         WORKER_THREAD_STATE.with(|t| {
             <span class="macro">assert!</span>(t.get().is_null());
             t.set(thread);
         });
     }

     <span class="doccomment">/// Returns the registry that owns this worker thread.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>registry(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Arc&lt;Registry&gt; {
         <span class="kw-2">&amp;</span><span class="self">self</span>.registry
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>log(<span class="kw-2">&amp;</span><span class="self">self</span>, event: <span class="kw">impl </span>FnOnce() -&gt; <span class="kw">crate</span>::log::Event) {
         <span class="self">self</span>.registry.logger.log(event)
     }

     <span class="doccomment">/// Our index amongst the worker threads (ranges from `0..self.num_threads()`).
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.index
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>push(<span class="kw-2">&amp;</span><span class="self">self</span>, job: JobRef) {
         <span class="self">self</span>.log(|| JobPushed { worker: <span class="self">self</span>.index });
         <span class="kw">let </span>queue_was_empty = <span class="self">self</span>.worker.is_empty();
         <span class="self">self</span>.worker.push(job);
         <span class="self">self</span>.registry
             .sleep
             .new_internal_jobs(<span class="self">self</span>.index, <span class="number">1</span>, queue_was_empty);
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>push_fifo(<span class="kw-2">&amp;</span><span class="self">self</span>, job: JobRef) {
         <span class="self">self</span>.push(<span class="self">self</span>.fifo.push(job));
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>local_deque_is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.worker.is_empty()
     }

     <span class="doccomment">/// Attempts to obtain a &quot;local&quot; job -- typically this means
     /// popping from the top of the stack, though if we are configured
     /// for breadth-first execution, it would mean dequeuing from the
     /// bottom.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>take_local_job(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;JobRef&gt; {
         <span class="kw">let </span>popped_job = <span class="self">self</span>.worker.pop();

         <span class="kw">if </span>popped_job.is_some() {
             <span class="self">self</span>.log(|| JobPopped { worker: <span class="self">self</span>.index });
             <span class="kw">return </span>popped_job;
         }

         <span class="kw">loop </span>{
             <span class="kw">match </span><span class="self">self</span>.stealer.steal() {
                 Steal::Success(job) =&gt; <span class="kw">return </span><span class="prelude-val">Some</span>(job),
                 Steal::Empty =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
                 Steal::Retry =&gt; {}
             }
         }
     }

     <span class="kw">fn </span>has_injected_job(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         !<span class="self">self</span>.stealer.is_empty() || <span class="self">self</span>.registry.has_injected_job()
     }

     <span class="doccomment">/// Wait until the latch is set. Try to keep busy by popping and
     /// stealing tasks as necessary.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>wait_until&lt;L: AsCoreLatch + <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, latch: <span class="kw-2">&amp;</span>L) {
         <span class="kw">let </span>latch = latch.as_core_latch();
         <span class="kw">if </span>!latch.probe() {
             <span class="self">self</span>.wait_until_cold(latch);
         }
     }

     <span class="attribute">#[cold]
     </span><span class="kw">unsafe fn </span>wait_until_cold(<span class="kw-2">&amp;</span><span class="self">self</span>, latch: <span class="kw-2">&amp;</span>CoreLatch) {
         <span class="comment">// the code below should swallow all panics and hence never
         // unwind; but if something does wrong, we want to abort,
         // because otherwise other code in rayon may assume that the
         // latch has been signaled, and that can lead to random memory
         // accesses, which would be *very bad*
         </span><span class="kw">let </span>abort_guard = unwind::AbortIfPanic;

         <span class="kw">let </span><span class="kw-2">mut </span>idle_state = <span class="self">self</span>.registry.sleep.start_looking(<span class="self">self</span>.index, latch);
         <span class="kw">while </span>!latch.probe() {
             <span class="kw">if let </span><span class="prelude-val">Some</span>(job) = <span class="self">self</span>.find_work() {
                 <span class="self">self</span>.registry.sleep.work_found(idle_state);
                 <span class="self">self</span>.execute(job);
                 idle_state = <span class="self">self</span>.registry.sleep.start_looking(<span class="self">self</span>.index, latch);
             } <span class="kw">else </span>{
                 <span class="self">self</span>.registry
                     .sleep
                     .no_work_found(<span class="kw-2">&amp;mut </span>idle_state, latch, || <span class="self">self</span>.has_injected_job())
             }
         }

         <span class="comment">// If we were sleepy, we are not anymore. We &quot;found work&quot; --
         // whatever the surrounding thread was doing before it had to
         // wait.
         </span><span class="self">self</span>.registry.sleep.work_found(idle_state);

         <span class="self">self</span>.log(|| ThreadSawLatchSet {
             worker: <span class="self">self</span>.index,
             latch_addr: latch.addr(),
         });
         mem::forget(abort_guard); <span class="comment">// successful execution, do not abort
     </span>}

     <span class="kw">fn </span>find_work(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;JobRef&gt; {
         <span class="comment">// Try to find some work to do. We give preference first
         // to things in our local deque, then in other workers
         // deques, and finally to injected jobs from the
         // outside. The idea is to finish what we started before
         // we take on something new.
         </span><span class="self">self</span>.take_local_job()
             .or_else(|| <span class="self">self</span>.steal())
             .or_else(|| <span class="self">self</span>.registry.pop_injected_job(<span class="self">self</span>.index))
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>yield_now(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Yield {
         <span class="kw">match </span><span class="self">self</span>.find_work() {
             <span class="prelude-val">Some</span>(job) =&gt; <span class="kw">unsafe </span>{
                 <span class="self">self</span>.execute(job);
                 Yield::Executed
             },
             <span class="prelude-val">None </span>=&gt; Yield::Idle,
         }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>yield_local(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Yield {
         <span class="kw">match </span><span class="self">self</span>.take_local_job() {
             <span class="prelude-val">Some</span>(job) =&gt; <span class="kw">unsafe </span>{
                 <span class="self">self</span>.execute(job);
                 Yield::Executed
             },
             <span class="prelude-val">None </span>=&gt; Yield::Idle,
         }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>execute(<span class="kw-2">&amp;</span><span class="self">self</span>, job: JobRef) {
         job.execute();
     }

     <span class="doccomment">/// Try to steal a single job and return it.
     ///
     /// This should only be done as a last resort, when there is no
     /// local work to do.
     </span><span class="kw">fn </span>steal(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;JobRef&gt; {
         <span class="comment">// we only steal when we don&#39;t have any work to do locally
         </span><span class="macro">debug_assert!</span>(<span class="self">self</span>.local_deque_is_empty());

         <span class="comment">// otherwise, try to steal
         </span><span class="kw">let </span>thread_infos = <span class="kw-2">&amp;</span><span class="self">self</span>.registry.thread_infos.as_slice();
         <span class="kw">let </span>num_threads = thread_infos.len();
         <span class="kw">if </span>num_threads &lt;= <span class="number">1 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }

         <span class="kw">loop </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>retry = <span class="bool-val">false</span>;
             <span class="kw">let </span>start = <span class="self">self</span>.rng.next_usize(num_threads);
             <span class="kw">let </span>job = (start..num_threads)
                 .chain(<span class="number">0</span>..start)
                 .filter(<span class="kw">move </span>|<span class="kw-2">&amp;</span>i| i != <span class="self">self</span>.index)
                 .find_map(|victim_index| {
                     <span class="kw">let </span>victim = <span class="kw-2">&amp;</span>thread_infos[victim_index];
                     <span class="kw">match </span>victim.stealer.steal() {
                         Steal::Success(job) =&gt; {
                             <span class="self">self</span>.log(|| JobStolen {
                                 worker: <span class="self">self</span>.index,
                                 victim: victim_index,
                             });
                             <span class="prelude-val">Some</span>(job)
                         }
                         Steal::Empty =&gt; <span class="prelude-val">None</span>,
                         Steal::Retry =&gt; {
                             retry = <span class="bool-val">true</span>;
                             <span class="prelude-val">None
                         </span>}
                     }
                 });
             <span class="kw">if </span>job.is_some() || !retry {
                 <span class="kw">return </span>job;
             }
         }
     }
 }

 <span class="doccomment">/// ////////////////////////////////////////////////////////////////////////

 </span><span class="kw">unsafe fn </span>main_loop(thread: ThreadBuilder) {
     <span class="kw">let </span>worker_thread = <span class="kw-2">&amp;</span>WorkerThread::from(thread);
     WorkerThread::set_current(worker_thread);
     <span class="kw">let </span>registry = <span class="kw-2">&amp;*</span>worker_thread.registry;
     <span class="kw">let </span>index = worker_thread.index;

     <span class="comment">// let registry know we are ready to do work
     </span>Latch::set(<span class="kw-2">&amp;</span>registry.thread_infos[index].primed);

     <span class="comment">// Worker threads should not panic. If they do, just abort, as the
     // internal state of the threadpool is corrupted. Note that if
     // **user code** panics, we should catch that and redirect.
     </span><span class="kw">let </span>abort_guard = unwind::AbortIfPanic;

     <span class="comment">// Inform a user callback that we started a thread.
     </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>handler) = registry.start_handler {
         registry.catch_unwind(|| handler(index));
     }

     <span class="kw">let </span>my_terminate_latch = <span class="kw-2">&amp;</span>registry.thread_infos[index].terminate;
     worker_thread.log(|| ThreadStart {
         worker: index,
         terminate_addr: my_terminate_latch.as_core_latch().addr(),
     });
     worker_thread.wait_until(my_terminate_latch);

     <span class="comment">// Should not be any work left in our queue.
     </span><span class="macro">debug_assert!</span>(worker_thread.take_local_job().is_none());

     <span class="comment">// let registry know we are done
     </span>Latch::set(<span class="kw-2">&amp;</span>registry.thread_infos[index].stopped);

     <span class="comment">// Normal termination, do not abort.
     </span>mem::forget(abort_guard);

     worker_thread.log(|| ThreadTerminate { worker: index });

     <span class="comment">// Inform a user callback that we exited a thread.
     </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>handler) = registry.exit_handler {
         registry.catch_unwind(|| handler(index));
         <span class="comment">// We&#39;re already exiting the thread, there&#39;s nothing else to do.
     </span>}
 }

 <span class="doccomment">/// If already in a worker-thread, just execute `op`.  Otherwise,
 /// execute `op` in the default thread-pool. Either way, block until
 /// `op` completes and return its return value. If `op` panics, that
 /// panic will be propagated as well.  The second argument indicates
 /// `true` if injection was performed, `false` if executed directly.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>in_worker&lt;OP, R&gt;(op: OP) -&gt; R
 <span class="kw">where
     </span>OP: FnOnce(<span class="kw-2">&amp;</span>WorkerThread, bool) -&gt; R + Send,
     R: Send,
 {
     <span class="kw">unsafe </span>{
         <span class="kw">let </span>owner_thread = WorkerThread::current();
         <span class="kw">if </span>!owner_thread.is_null() {
             <span class="comment">// Perfectly valid to give them a `&amp;T`: this is the
             // current thread, so we know the data structure won&#39;t be
             // invalidated until we return.
             </span>op(<span class="kw-2">&amp;*</span>owner_thread, <span class="bool-val">false</span>)
         } <span class="kw">else </span>{
             global_registry().in_worker(op)
         }
     }
 }

 <span class="doccomment">/// [xorshift*] is a fast pseudorandom number generator which will
 /// even tolerate weak seeding, as long as it&#39;s not zero.
 ///
 /// [xorshift*]: https://en.wikipedia.org/wiki/Xorshift#xorshift*
 </span><span class="kw">struct </span>XorShift64Star {
     state: Cell&lt;u64&gt;,
 }

 <span class="kw">impl </span>XorShift64Star {
     <span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         <span class="comment">// Any non-zero seed will do -- this uses the hash of a global counter.
         </span><span class="kw">let </span><span class="kw-2">mut </span>seed = <span class="number">0</span>;
         <span class="kw">while </span>seed == <span class="number">0 </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>hasher = DefaultHasher::new();
             <span class="kw">static </span>COUNTER: AtomicUsize = AtomicUsize::new(<span class="number">0</span>);
             hasher.write_usize(COUNTER.fetch_add(<span class="number">1</span>, Ordering::Relaxed));
             seed = hasher.finish();
         }

         XorShift64Star {
             state: Cell::new(seed),
         }
     }

     <span class="kw">fn </span>next(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u64 {
         <span class="kw">let </span><span class="kw-2">mut </span>x = <span class="self">self</span>.state.get();
         <span class="macro">debug_assert_ne!</span>(x, <span class="number">0</span>);
         x ^= x &gt;&gt; <span class="number">12</span>;
         x ^= x &lt;&lt; <span class="number">25</span>;
         x ^= x &gt;&gt; <span class="number">27</span>;
         <span class="self">self</span>.state.set(x);
         x.wrapping_mul(<span class="number">0x2545_f491_4f6c_dd1d</span>)
     }

     <span class="doccomment">/// Return a value from `0..n`.
     </span><span class="kw">fn </span>next_usize(<span class="kw-2">&amp;</span><span class="self">self</span>, n: usize) -&gt; usize {
         (<span class="self">self</span>.next() % n <span class="kw">as </span>u64) <span class="kw">as </span>usize
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rayon_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>