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</pre><pre class="rust">
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::job</span>::{<span class="ident">JobFifo</span>, <span class="ident">JobRef</span>, <span class="ident">StackJob</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::latch</span>::{<span class="ident">AsCoreLatch</span>, <span class="ident">CoreLatch</span>, <span class="ident">CountLatch</span>, <span class="ident">Latch</span>, <span class="ident">LockLatch</span>, <span class="ident">SpinLatch</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::log::Event</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::log::Logger</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::sleep::Sleep</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::unwind</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
<span class="ident">ErrorKind</span>, <span class="ident">ExitHandler</span>, <span class="ident">PanicHandler</span>, <span class="ident">StartHandler</span>, <span class="ident">ThreadPoolBuildError</span>, <span class="ident">ThreadPoolBuilder</span>,
};
<span class="kw">use</span> <span class="ident">crossbeam_deque</span>::{<span class="ident">Injector</span>, <span class="ident">Steal</span>, <span class="ident">Stealer</span>, <span class="ident">Worker</span>};
<span class="kw">use</span> <span class="ident">std::any::Any</span>;
<span class="kw">use</span> <span class="ident">std::cell::Cell</span>;
<span class="kw">use</span> <span class="ident">std::collections::hash_map::DefaultHasher</span>;
<span class="kw">use</span> <span class="ident">std::fmt</span>;
<span class="kw">use</span> <span class="ident">std::hash::Hasher</span>;
<span class="kw">use</span> <span class="ident">std::io</span>;
<span class="kw">use</span> <span class="ident">std::mem</span>;
<span class="kw">use</span> <span class="ident">std::ptr</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">use</span> <span class="ident">std::sync::atomic::ATOMIC_USIZE_INIT</span>;
<span class="kw">use</span> <span class="ident">std::sync::atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">std::sync</span>::{<span class="ident">Arc</span>, <span class="ident">Once</span>};
<span class="kw">use</span> <span class="ident">std::thread</span>;
<span class="kw">use</span> <span class="ident">std::usize</span>;
<span class="doccomment">/// Thread builder used for customization via</span>
<span class="doccomment">/// [`ThreadPoolBuilder::spawn_handler`](struct.ThreadPoolBuilder.html#method.spawn_handler).</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ThreadBuilder</span> {
<span class="ident">name</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
<span class="ident">stack_size</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>,
<span class="ident">worker</span>: <span class="ident">Worker</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>,
<span class="ident">registry</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>,
<span class="ident">index</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span> <span class="ident">ThreadBuilder</span> {
<span class="doccomment">/// Gets the index of this thread in the pool, within `0..num_threads`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">index</span>
}
<span class="doccomment">/// Gets the string that was specified by `ThreadPoolBuilder::name()`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">name</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="ident">String::as_str</span>)
}
<span class="doccomment">/// Gets the value that was specified by `ThreadPoolBuilder::stack_size()`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stack_size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stack_size</span>
}
<span class="doccomment">/// Executes the main loop for this thread. This will not return until the</span>
<span class="doccomment">/// thread pool is dropped.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run</span>(<span class="self">self</span>) {
<span class="kw">unsafe</span> { <span class="ident">main_loop</span>(<span class="self">self</span>.<span class="ident">worker</span>, <span class="self">self</span>.<span class="ident">registry</span>, <span class="self">self</span>.<span class="ident">index</span>) }
}
}
<span class="kw">impl</span> <span class="ident">fmt::Debug</span> <span class="kw">for</span> <span class="ident">ThreadBuilder</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt::Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"ThreadBuilder"</span>)
.<span class="ident">field</span>(<span class="string">"pool"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">id</span>())
.<span class="ident">field</span>(<span class="string">"index"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">index</span>)
.<span class="ident">field</span>(<span class="string">"name"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">name</span>)
.<span class="ident">field</span>(<span class="string">"stack_size"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">stack_size</span>)
.<span class="ident">finish</span>()
}
}
<span class="doccomment">/// Generalized trait for spawning a thread in the `Registry`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait is pub-in-private -- E0445 forces us to make it public,</span>
<span class="doccomment">/// but we don't actually want to expose these details in the API.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">ThreadSpawn</span> {
<span class="macro">private_decl!</span> {}
<span class="doccomment">/// Spawn a thread with the `ThreadBuilder` parameters, and then</span>
<span class="doccomment">/// call `ThreadBuilder::run()`.</span>
<span class="kw">fn</span> <span class="ident">spawn</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">thread</span>: <span class="ident">ThreadBuilder</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span>;
}
<span class="doccomment">/// Spawns a thread in the "normal" way with `std::thread::Builder`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type is pub-in-private -- E0445 forces us to make it public,</span>
<span class="doccomment">/// but we don't actually want to expose these details in the API.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Default</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DefaultSpawn</span>;
<span class="kw">impl</span> <span class="ident">ThreadSpawn</span> <span class="kw">for</span> <span class="ident">DefaultSpawn</span> {
<span class="macro">private_impl!</span> {}
<span class="kw">fn</span> <span class="ident">spawn</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">thread</span>: <span class="ident">ThreadBuilder</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">thread::Builder::new</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">name</span>) <span class="op">=</span> <span class="ident">thread</span>.<span class="ident">name</span>() {
<span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">name</span>(<span class="ident">name</span>.<span class="ident">to_owned</span>());
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">stack_size</span>) <span class="op">=</span> <span class="ident">thread</span>.<span class="ident">stack_size</span>() {
<span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">stack_size</span>(<span class="ident">stack_size</span>);
}
<span class="ident">b</span>.<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">thread</span>.<span class="ident">run</span>())<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// Spawns a thread with a user's custom callback.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type is pub-in-private -- E0445 forces us to make it public,</span>
<span class="doccomment">/// but we don't actually want to expose these details in the API.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CustomSpawn</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="ident">F</span>);
<span class="kw">impl</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> <span class="ident">CustomSpawn</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">ThreadBuilder</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span>,
{
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">spawn</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">CustomSpawn</span>(<span class="ident">spawn</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> <span class="ident">ThreadSpawn</span> <span class="kw">for</span> <span class="ident">CustomSpawn</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">ThreadBuilder</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span>,
{
<span class="macro">private_impl!</span> {}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">spawn</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">thread</span>: <span class="ident">ThreadBuilder</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io::Result</span><span class="op"><</span>()<span class="op">></span> {
(<span class="self">self</span>.<span class="number">0</span>)(<span class="ident">thread</span>)
}
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct</span> <span class="ident">Registry</span> {
<span class="ident">logger</span>: <span class="ident">Logger</span>,
<span class="ident">thread_infos</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">ThreadInfo</span><span class="op">></span>,
<span class="ident">sleep</span>: <span class="ident">Sleep</span>,
<span class="ident">injected_jobs</span>: <span class="ident">Injector</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>,
<span class="ident">panic_handler</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">PanicHandler</span><span class="op">></span><span class="op">></span>,
<span class="ident">start_handler</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">StartHandler</span><span class="op">></span><span class="op">></span>,
<span class="ident">exit_handler</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">ExitHandler</span><span class="op">></span><span class="op">></span>,
<span class="comment">// When this latch reaches 0, it means that all work on this</span>
<span class="comment">// registry must be complete. This is ensured in the following ways:</span>
<span class="comment">//</span>
<span class="comment">// - if this is the global registry, there is a ref-count that never</span>
<span class="comment">// gets released.</span>
<span class="comment">// - if this is a user-created thread-pool, then so long as the thread-pool</span>
<span class="comment">// exists, it holds a reference.</span>
<span class="comment">// - when we inject a "blocking job" into the registry with `ThreadPool::install()`,</span>
<span class="comment">// no adjustment is needed; the `ThreadPool` holds the reference, and since we won't</span>
<span class="comment">// return until the blocking job is complete, that ref will continue to be held.</span>
<span class="comment">// - when `join()` or `scope()` is invoked, similarly, no adjustments are needed.</span>
<span class="comment">// These are always owned by some other job (e.g., one injected by `ThreadPool::install()`)</span>
<span class="comment">// and that job will keep the pool alive.</span>
<span class="ident">terminate_count</span>: <span class="ident">AtomicUsize</span>,
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////</span>
<span class="doccomment">/// Initialization</span>
<span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">THE_REGISTRY</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">static</span> <span class="ident">THE_REGISTRY_SET</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once::new</span>();
<span class="doccomment">/// Starts the worker threads (if that has not already happened). If</span>
<span class="doccomment">/// initialization has not already occurred, use the default</span>
<span class="doccomment">/// configuration.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">global_registry</span>() <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span> {
<span class="ident">set_global_registry</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">Registry::new</span>(<span class="ident">ThreadPoolBuilder::new</span>()))
.<span class="ident">or_else</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">THE_REGISTRY</span>.<span class="ident">as_ref</span>().<span class="ident">ok_or</span>(<span class="ident">err</span>) })
.<span class="ident">expect</span>(<span class="string">"The global thread pool has not been initialized."</span>)
}
<span class="doccomment">/// Starts the worker threads (if that has not already happened) with</span>
<span class="doccomment">/// the given builder.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">init_global_registry</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(
<span class="ident">builder</span>: <span class="ident">ThreadPoolBuilder</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>, <span class="ident">ThreadPoolBuildError</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">ThreadSpawn</span>,
{
<span class="ident">set_global_registry</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">Registry::new</span>(<span class="ident">builder</span>))
}
<span class="doccomment">/// Starts the worker threads (if that has not already happened)</span>
<span class="doccomment">/// by creating a registry with the given callback.</span>
<span class="kw">fn</span> <span class="ident">set_global_registry</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="ident">registry</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>, <span class="ident">ThreadPoolBuildError</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>, <span class="ident">ThreadPoolBuildError</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="prelude-val">Err</span>(<span class="ident">ThreadPoolBuildError::new</span>(
<span class="ident">ErrorKind::GlobalPoolAlreadyInitialized</span>,
));
<span class="ident">THE_REGISTRY_SET</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
<span class="ident">result</span> <span class="op">=</span> <span class="ident">registry</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">registry</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">THE_REGISTRY</span>.<span class="ident">get_or_insert</span>(<span class="ident">registry</span>) })
});
<span class="ident">result</span>
}
<span class="kw">struct</span> <span class="ident">Terminator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>);
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Terminator</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">terminate</span>()
}
}
<span class="kw">impl</span> <span class="ident">Registry</span> {
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(
<span class="kw-2">mut</span> <span class="ident">builder</span>: <span class="ident">ThreadPoolBuilder</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>,
) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Arc</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>, <span class="ident">ThreadPoolBuildError</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">ThreadSpawn</span>,
{
<span class="kw">let</span> <span class="ident">n_threads</span> <span class="op">=</span> <span class="ident">builder</span>.<span class="ident">get_num_threads</span>();
<span class="kw">let</span> <span class="ident">breadth_first</span> <span class="op">=</span> <span class="ident">builder</span>.<span class="ident">get_breadth_first</span>();
<span class="kw">let</span> (<span class="ident">workers</span>, <span class="ident">stealers</span>): (<span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span>) <span class="op">=</span> (<span class="number">0</span>..<span class="ident">n_threads</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">worker</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">breadth_first</span> {
<span class="ident">Worker::new_fifo</span>()
} <span class="kw">else</span> {
<span class="ident">Worker::new_lifo</span>()
};
<span class="kw">let</span> <span class="ident">stealer</span> <span class="op">=</span> <span class="ident">worker</span>.<span class="ident">stealer</span>();
(<span class="ident">worker</span>, <span class="ident">stealer</span>)
})
.<span class="ident">unzip</span>();
<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">Logger::new</span>(<span class="ident">n_threads</span>);
<span class="kw">let</span> <span class="ident">registry</span> <span class="op">=</span> <span class="ident">Arc::new</span>(<span class="ident">Registry</span> {
<span class="ident">logger</span>: <span class="ident">logger</span>.<span class="ident">clone</span>(),
<span class="ident">thread_infos</span>: <span class="ident">stealers</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="ident">ThreadInfo::new</span>).<span class="ident">collect</span>(),
<span class="ident">sleep</span>: <span class="ident">Sleep::new</span>(<span class="ident">logger</span>, <span class="ident">n_threads</span>),
<span class="ident">injected_jobs</span>: <span class="ident">Injector::new</span>(),
<span class="ident">terminate_count</span>: <span class="ident">AtomicUsize::new</span>(<span class="number">1</span>),
<span class="ident">panic_handler</span>: <span class="ident">builder</span>.<span class="ident">take_panic_handler</span>(),
<span class="ident">start_handler</span>: <span class="ident">builder</span>.<span class="ident">take_start_handler</span>(),
<span class="ident">exit_handler</span>: <span class="ident">builder</span>.<span class="ident">take_exit_handler</span>(),
});
<span class="comment">// If we return early or panic, make sure to terminate existing threads.</span>
<span class="kw">let</span> <span class="ident">t1000</span> <span class="op">=</span> <span class="ident">Terminator</span>(<span class="kw-2">&</span><span class="ident">registry</span>);
<span class="kw">for</span> (<span class="ident">index</span>, <span class="ident">worker</span>) <span class="kw">in</span> <span class="ident">workers</span>.<span class="ident">into_iter</span>().<span class="ident">enumerate</span>() {
<span class="kw">let</span> <span class="ident">thread</span> <span class="op">=</span> <span class="ident">ThreadBuilder</span> {
<span class="ident">name</span>: <span class="ident">builder</span>.<span class="ident">get_thread_name</span>(<span class="ident">index</span>),
<span class="ident">stack_size</span>: <span class="ident">builder</span>.<span class="ident">get_stack_size</span>(),
<span class="ident">registry</span>: <span class="ident">registry</span>.<span class="ident">clone</span>(),
<span class="ident">worker</span>,
<span class="ident">index</span>,
};
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=</span> <span class="ident">builder</span>.<span class="ident">get_spawn_handler</span>().<span class="ident">spawn</span>(<span class="ident">thread</span>) {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ThreadPoolBuildError::new</span>(<span class="ident">ErrorKind::IOError</span>(<span class="ident">e</span>)));
}
}
<span class="comment">// Returning normally now, without termination.</span>
<span class="ident">mem::forget</span>(<span class="ident">t1000</span>);
<span class="prelude-val">Ok</span>(<span class="ident">registry</span>.<span class="ident">clone</span>())
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">current</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="kw">if</span> <span class="ident">worker_thread</span>.<span class="ident">is_null</span>() {
<span class="ident">global_registry</span>().<span class="ident">clone</span>()
} <span class="kw">else</span> {
(<span class="kw-2">*</span><span class="ident">worker_thread</span>).<span class="ident">registry</span>.<span class="ident">clone</span>()
}
}
}
<span class="doccomment">/// Returns the number of threads in the current registry. This</span>
<span class="doccomment">/// is better than `Registry::current().num_threads()` because it</span>
<span class="doccomment">/// avoids incrementing the `Arc`.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">current_num_threads</span>() <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="kw">if</span> <span class="ident">worker_thread</span>.<span class="ident">is_null</span>() {
<span class="ident">global_registry</span>().<span class="ident">num_threads</span>()
} <span class="kw">else</span> {
(<span class="kw-2">*</span><span class="ident">worker_thread</span>).<span class="ident">registry</span>.<span class="ident">num_threads</span>()
}
}
}
<span class="doccomment">/// Returns the current `WorkerThread` if it's part of this `Registry`.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">current_thread</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">WorkerThread</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">worker</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>().<span class="ident">as_ref</span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">worker</span>.<span class="ident">registry</span>().<span class="ident">id</span>() <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>() {
<span class="prelude-val">Some</span>(<span class="ident">worker</span>)
} <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> <span class="ident">id</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RegistryId</span> {
<span class="comment">// We can rely on `self` not to change since we only ever create</span>
<span class="comment">// registries that are boxed up in an `Arc` (see `new()` above).</span>
<span class="ident">RegistryId</span> {
<span class="ident">addr</span>: <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="self">Self</span> <span class="kw">as</span> <span class="ident">usize</span>,
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">event</span>: <span class="kw">impl</span> <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="kw">crate</span><span class="ident">::log::Event</span>) {
<span class="self">self</span>.<span class="ident">logger</span>.<span class="ident">log</span>(<span class="ident">event</span>)
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">num_threads</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">thread_infos</span>.<span class="ident">len</span>()
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">handle_panic</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">err</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span>) {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">panic_handler</span> {
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">handler</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// If the customizable panic handler itself panics,</span>
<span class="comment">// then we abort.</span>
<span class="kw">let</span> <span class="ident">abort_guard</span> <span class="op">=</span> <span class="ident">unwind::AbortIfPanic</span>;
<span class="ident">handler</span>(<span class="ident">err</span>);
<span class="ident">mem::forget</span>(<span class="ident">abort_guard</span>);
}
<span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Default panic handler aborts.</span>
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">unwind::AbortIfPanic</span>; <span class="comment">// let this drop.</span>
}
}
}
<span class="doccomment">/// Waits for the worker threads to get up and running. This is</span>
<span class="doccomment">/// meant to be used for benchmarking purposes, primarily, so that</span>
<span class="doccomment">/// you can get more consistent numbers by having everything</span>
<span class="doccomment">/// "ready to go".</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">wait_until_primed</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">for</span> <span class="ident">info</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">thread_infos</span> {
<span class="ident">info</span>.<span class="ident">primed</span>.<span class="ident">wait</span>();
}
}
<span class="doccomment">/// Waits for the worker threads to stop. This is used for testing</span>
<span class="doccomment">/// -- so we can check that termination actually works.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">wait_until_stopped</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">for</span> <span class="ident">info</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">thread_infos</span> {
<span class="ident">info</span>.<span class="ident">stopped</span>.<span class="ident">wait</span>();
}
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////</span>
<span class="doccomment">/// MAIN LOOP</span>
<span class="doccomment">///</span>
<span class="doccomment">/// So long as all of the worker threads are hanging out in their</span>
<span class="doccomment">/// top-level loop, there is no work to be done.</span>
<span class="doccomment">/// Push a job into the given `registry`. If we are running on a</span>
<span class="doccomment">/// worker thread for the registry, this will push onto the</span>
<span class="doccomment">/// 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> <span class="ident">inject_or_push</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">job_ref</span>: <span class="ident">JobRef</span>) {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">worker_thread</span>.<span class="ident">is_null</span>() <span class="op">&&</span> (<span class="kw-2">*</span><span class="ident">worker_thread</span>).<span class="ident">registry</span>().<span class="ident">id</span>() <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>() {
(<span class="kw-2">*</span><span class="ident">worker_thread</span>).<span class="ident">push</span>(<span class="ident">job_ref</span>);
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">inject</span>(<span class="kw-2">&</span>[<span class="ident">job_ref</span>]);
}
}
}
<span class="doccomment">/// Push a job into the "external jobs" queue; it will be taken by</span>
<span class="doccomment">/// whatever worker has nothing to do. Use this is you know that</span>
<span class="doccomment">/// 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> <span class="ident">inject</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">injected_jobs</span>: <span class="kw-2">&</span>[<span class="ident">JobRef</span>]) {
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">JobsInjected</span> {
<span class="ident">count</span>: <span class="ident">injected_jobs</span>.<span class="ident">len</span>(),
});
<span class="comment">// It should not be possible for `state.terminate` to be true</span>
<span class="comment">// here. It is only set to true when the user creates (and</span>
<span class="comment">// drops) a `ThreadPool`; and, in that case, they cannot be</span>
<span class="comment">// calling `inject()` later, since they dropped their</span>
<span class="comment">// `ThreadPool`.</span>
<span class="macro">debug_assert_ne!</span>(
<span class="self">self</span>.<span class="ident">terminate_count</span>.<span class="ident">load</span>(<span class="ident">Ordering::Acquire</span>),
<span class="number">0</span>,
<span class="string">"inject() sees state.terminate as true"</span>
);
<span class="kw">let</span> <span class="ident">queue_was_empty</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">injected_jobs</span>.<span class="ident">is_empty</span>();
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">job_ref</span> <span class="kw">in</span> <span class="ident">injected_jobs</span> {
<span class="self">self</span>.<span class="ident">injected_jobs</span>.<span class="ident">push</span>(<span class="ident">job_ref</span>);
}
<span class="self">self</span>.<span class="ident">sleep</span>
.<span class="ident">new_injected_jobs</span>(<span class="ident">usize::MAX</span>, <span class="ident">injected_jobs</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">queue_was_empty</span>);
}
<span class="kw">fn</span> <span class="ident">has_injected_job</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="op">!</span><span class="self">self</span>.<span class="ident">injected_jobs</span>.<span class="ident">is_empty</span>()
}
<span class="kw">fn</span> <span class="ident">pop_injected_job</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">worker_index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">injected_jobs</span>.<span class="ident">steal</span>() {
<span class="ident">Steal::Success</span>(<span class="ident">job</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">JobUninjected</span> {
<span class="ident">worker</span>: <span class="ident">worker_index</span>,
});
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">job</span>);
}
<span class="ident">Steal::Empty</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
<span class="ident">Steal::Retry</span> <span class="op">=</span><span class="op">></span> {}
}
}
}
<span class="doccomment">/// If already in a worker-thread of this registry, just execute `op`.</span>
<span class="doccomment">/// Otherwise, inject `op` in this thread-pool. Either way, block until `op`</span>
<span class="doccomment">/// completes and return its return value. If `op` panics, that panic will</span>
<span class="doccomment">/// be propagated as well. The second argument indicates `true` if injection</span>
<span class="doccomment">/// was performed, `false` if executed directly.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">in_worker</span><span class="op"><</span><span class="ident">OP</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">op</span>: <span class="ident">OP</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>
<span class="kw">where</span>
<span class="ident">OP</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">WorkerThread</span>, <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">R</span>: <span class="ident">Send</span>,
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="kw">if</span> <span class="ident">worker_thread</span>.<span class="ident">is_null</span>() {
<span class="self">self</span>.<span class="ident">in_worker_cold</span>(<span class="ident">op</span>)
} <span class="kw">else</span> <span class="kw">if</span> (<span class="kw-2">*</span><span class="ident">worker_thread</span>).<span class="ident">registry</span>().<span class="ident">id</span>() <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>() {
<span class="self">self</span>.<span class="ident">in_worker_cross</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">worker_thread</span>, <span class="ident">op</span>)
} <span class="kw">else</span> {
<span class="comment">// Perfectly valid to give them a `&T`: this is the</span>
<span class="comment">// current thread, so we know the data structure won't be</span>
<span class="comment">// invalidated until we return.</span>
<span class="ident">op</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">worker_thread</span>, <span class="bool-val">false</span>)
}
}
}
<span class="attribute">#[<span class="ident">cold</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">in_worker_cold</span><span class="op"><</span><span class="ident">OP</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">op</span>: <span class="ident">OP</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>
<span class="kw">where</span>
<span class="ident">OP</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">WorkerThread</span>, <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">R</span>: <span class="ident">Send</span>,
{
<span class="macro">thread_local!</span>(<span class="kw">static</span> <span class="ident">LOCK_LATCH</span>: <span class="ident">LockLatch</span> <span class="op">=</span> <span class="ident">LockLatch::new</span>());
<span class="ident">LOCK_LATCH</span>.<span class="ident">with</span>(<span class="op">|</span><span class="ident">l</span><span class="op">|</span> {
<span class="comment">// This thread isn't a member of *any* thread pool, so just block.</span>
<span class="macro">debug_assert!</span>(<span class="ident">WorkerThread::current</span>().<span class="ident">is_null</span>());
<span class="kw">let</span> <span class="ident">job</span> <span class="op">=</span> <span class="ident">StackJob::new</span>(
<span class="op">|</span><span class="ident">injected</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="macro">assert!</span>(<span class="ident">injected</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">worker_thread</span>.<span class="ident">is_null</span>());
<span class="ident">op</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">worker_thread</span>, <span class="bool-val">true</span>)
},
<span class="ident">l</span>,
);
<span class="self">self</span>.<span class="ident">inject</span>(<span class="kw-2">&</span>[<span class="ident">job</span>.<span class="ident">as_job_ref</span>()]);
<span class="ident">job</span>.<span class="ident">latch</span>.<span class="ident">wait_and_reset</span>(); <span class="comment">// Make sure we can use the same latch again next time.</span>
<span class="comment">// flush accumulated logs as we exit the thread</span>
<span class="self">self</span>.<span class="ident">logger</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">Flush</span>);
<span class="ident">job</span>.<span class="ident">into_result</span>()
})
}
<span class="attribute">#[<span class="ident">cold</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">in_worker_cross</span><span class="op"><</span><span class="ident">OP</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">current_thread</span>: <span class="kw-2">&</span><span class="ident">WorkerThread</span>, <span class="ident">op</span>: <span class="ident">OP</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>
<span class="kw">where</span>
<span class="ident">OP</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">WorkerThread</span>, <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">R</span>: <span class="ident">Send</span>,
{
<span class="comment">// This thread is a member of a different pool, so let it process</span>
<span class="comment">// other work while waiting for this `op` to complete.</span>
<span class="macro">debug_assert!</span>(<span class="ident">current_thread</span>.<span class="ident">registry</span>().<span class="ident">id</span>() <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>());
<span class="kw">let</span> <span class="ident">latch</span> <span class="op">=</span> <span class="ident">SpinLatch::cross</span>(<span class="ident">current_thread</span>);
<span class="kw">let</span> <span class="ident">job</span> <span class="op">=</span> <span class="ident">StackJob::new</span>(
<span class="op">|</span><span class="ident">injected</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="macro">assert!</span>(<span class="ident">injected</span> <span class="op">&&</span> <span class="op">!</span><span class="ident">worker_thread</span>.<span class="ident">is_null</span>());
<span class="ident">op</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">worker_thread</span>, <span class="bool-val">true</span>)
},
<span class="ident">latch</span>,
);
<span class="self">self</span>.<span class="ident">inject</span>(<span class="kw-2">&</span>[<span class="ident">job</span>.<span class="ident">as_job_ref</span>()]);
<span class="ident">current_thread</span>.<span class="ident">wait_until</span>(<span class="kw-2">&</span><span class="ident">job</span>.<span class="ident">latch</span>);
<span class="ident">job</span>.<span class="ident">into_result</span>()
}
<span class="doccomment">/// Increments the terminate counter. This increment should be</span>
<span class="doccomment">/// balanced by a call to `terminate`, which will decrement. This</span>
<span class="doccomment">/// is used when spawning asynchronous work, which needs to</span>
<span class="doccomment">/// prevent the registry from terminating so long as it is active.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that blocking functions such as `join` and `scope` do not</span>
<span class="doccomment">/// need to concern themselves with this fn; their context is</span>
<span class="doccomment">/// responsible for ensuring the current thread-pool will not</span>
<span class="doccomment">/// terminate until they return.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The global thread-pool always has an outstanding reference</span>
<span class="doccomment">/// (the initial one). Custom thread-pools have one outstanding</span>
<span class="doccomment">/// reference that is dropped when the `ThreadPool` is dropped:</span>
<span class="doccomment">/// since installing the thread-pool blocks until any joins/scopes</span>
<span class="doccomment">/// complete, this ensures that joins/scopes are covered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The exception is `::spawn()`, which can create a job outside</span>
<span class="doccomment">/// of any blocking scope. In that case, the job itself holds a</span>
<span class="doccomment">/// terminate count and is responsible for invoking `terminate()`</span>
<span class="doccomment">/// when finished.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">increment_terminate_count</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">let</span> <span class="ident">previous</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">terminate_count</span>.<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Ordering::AcqRel</span>);
<span class="macro">debug_assert!</span>(<span class="ident">previous</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span>, <span class="string">"registry ref count incremented from zero"</span>);
<span class="macro">assert!</span>(
<span class="ident">previous</span> <span class="op">!</span><span class="op">=</span> <span class="ident">std::usize::MAX</span>,
<span class="string">"overflow in registry ref count"</span>
);
}
<span class="doccomment">/// Signals that the thread-pool which owns this registry has been</span>
<span class="doccomment">/// dropped. The worker threads will gradually terminate, once any</span>
<span class="doccomment">/// extant work is completed.</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">terminate</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">terminate_count</span>.<span class="ident">fetch_sub</span>(<span class="number">1</span>, <span class="ident">Ordering::AcqRel</span>) <span class="op">=</span><span class="op">=</span> <span class="number">1</span> {
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">thread_info</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">thread_infos</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
<span class="ident">thread_info</span>.<span class="ident">terminate</span>.<span class="ident">set_and_tickle_one</span>(<span class="self">self</span>, <span class="ident">i</span>);
}
}
}
<span class="doccomment">/// Notify the worker that the latch they are sleeping on has been "set".</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">notify_worker_latch_is_set</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">target_worker_index</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">sleep</span>.<span class="ident">notify_worker_latch_is_set</span>(<span class="ident">target_worker_index</span>);
}
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>)]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct</span> <span class="ident">RegistryId</span> {
<span class="ident">addr</span>: <span class="ident">usize</span>,
}
<span class="kw">struct</span> <span class="ident">ThreadInfo</span> {
<span class="doccomment">/// Latch set once thread has started and we are entering into the</span>
<span class="doccomment">/// main loop. Used to wait for worker threads to become primed,</span>
<span class="doccomment">/// primarily of interest for benchmarking.</span>
<span class="ident">primed</span>: <span class="ident">LockLatch</span>,
<span class="doccomment">/// Latch is set once worker thread has completed. Used to wait</span>
<span class="doccomment">/// until workers have stopped; only used for tests.</span>
<span class="ident">stopped</span>: <span class="ident">LockLatch</span>,
<span class="doccomment">/// The latch used to signal that terminated has been requested.</span>
<span class="doccomment">/// This latch is *set* by the `terminate` method on the</span>
<span class="doccomment">/// `Registry`, once the registry's main "terminate" counter</span>
<span class="doccomment">/// reaches zero.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// NB. We use a `CountLatch` here because it has no lifetimes and is</span>
<span class="doccomment">/// meant for async use, but the count never gets higher than one.</span>
<span class="ident">terminate</span>: <span class="ident">CountLatch</span>,
<span class="doccomment">/// the "stealer" half of the worker's deque</span>
<span class="ident">stealer</span>: <span class="ident">Stealer</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">ThreadInfo</span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">stealer</span>: <span class="ident">Stealer</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">ThreadInfo</span> {
<span class="ident">ThreadInfo</span> {
<span class="ident">primed</span>: <span class="ident">LockLatch::new</span>(),
<span class="ident">stopped</span>: <span class="ident">LockLatch::new</span>(),
<span class="ident">terminate</span>: <span class="ident">CountLatch::new</span>(),
<span class="ident">stealer</span>,
}
}
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////</span>
<span class="doccomment">/// WorkerThread identifiers</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct</span> <span class="ident">WorkerThread</span> {
<span class="doccomment">/// the "worker" half of our local deque</span>
<span class="ident">worker</span>: <span class="ident">Worker</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>,
<span class="doccomment">/// local queue used for `spawn_fifo` indirection</span>
<span class="ident">fifo</span>: <span class="ident">JobFifo</span>,
<span class="ident">index</span>: <span class="ident">usize</span>,
<span class="doccomment">/// A weak random number generator.</span>
<span class="ident">rng</span>: <span class="ident">XorShift64Star</span>,
<span class="ident">registry</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>,
}
<span class="comment">// This is a bit sketchy, but basically: the WorkerThread is</span>
<span class="comment">// allocated on the stack of the worker on entry and stored into this</span>
<span class="comment">// thread local variable. So it will remain valid at least until the</span>
<span class="comment">// worker is fully unwound. Using an unsafe pointer avoids the need</span>
<span class="comment">// for a RefCell<T> etc.</span>
<span class="macro">thread_local!</span> {
<span class="kw">static</span> <span class="ident">WORKER_THREAD_STATE</span>: <span class="ident">Cell</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">WorkerThread</span><span class="op">></span> <span class="op">=</span> <span class="ident">Cell::new</span>(<span class="ident">ptr::null</span>());
}
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">WorkerThread</span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="comment">// Undo `set_current`</span>
<span class="ident">WORKER_THREAD_STATE</span>.<span class="ident">with</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> {
<span class="macro">assert!</span>(<span class="ident">t</span>.<span class="ident">get</span>().<span class="ident">eq</span>(<span class="kw-2">&</span>(<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span>)));
<span class="ident">t</span>.<span class="ident">set</span>(<span class="ident">ptr::null</span>());
});
}
}
<span class="kw">impl</span> <span class="ident">WorkerThread</span> {
<span class="doccomment">/// Gets the `WorkerThread` index for the current thread; returns</span>
<span class="doccomment">/// NULL if this is not a worker thread. This pointer is valid</span>
<span class="doccomment">/// anywhere on the current thread.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">current</span>() <span class="op">-</span><span class="op">></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">WorkerThread</span> {
<span class="ident">WORKER_THREAD_STATE</span>.<span class="ident">with</span>(<span class="ident">Cell::get</span>)
}
<span class="doccomment">/// Sets `self` as the worker thread index for the current thread.</span>
<span class="doccomment">/// This is done during worker thread startup.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">set_current</span>(<span class="ident">thread</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">WorkerThread</span>) {
<span class="ident">WORKER_THREAD_STATE</span>.<span class="ident">with</span>(<span class="op">|</span><span class="ident">t</span><span class="op">|</span> {
<span class="macro">assert!</span>(<span class="ident">t</span>.<span class="ident">get</span>().<span class="ident">is_null</span>());
<span class="ident">t</span>.<span class="ident">set</span>(<span class="ident">thread</span>);
});
}
<span class="doccomment">/// Returns the registry that owns this worker thread.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">registry</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">registry</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">event</span>: <span class="kw">impl</span> <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="kw">crate</span><span class="ident">::log::Event</span>) {
<span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">logger</span>.<span class="ident">log</span>(<span class="ident">event</span>)
}
<span class="doccomment">/// Our index amongst the worker threads (ranges from `0..self.num_threads()`).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">index</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">push</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">job</span>: <span class="ident">JobRef</span>) {
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">JobPushed</span> { <span class="ident">worker</span>: <span class="self">self</span>.<span class="ident">index</span> });
<span class="kw">let</span> <span class="ident">queue_was_empty</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">worker</span>.<span class="ident">is_empty</span>();
<span class="self">self</span>.<span class="ident">worker</span>.<span class="ident">push</span>(<span class="ident">job</span>);
<span class="self">self</span>.<span class="ident">registry</span>
.<span class="ident">sleep</span>
.<span class="ident">new_internal_jobs</span>(<span class="self">self</span>.<span class="ident">index</span>, <span class="number">1</span>, <span class="ident">queue_was_empty</span>);
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">push_fifo</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">job</span>: <span class="ident">JobRef</span>) {
<span class="self">self</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">fifo</span>.<span class="ident">push</span>(<span class="ident">job</span>));
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn</span> <span class="ident">local_deque_is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">worker</span>.<span class="ident">is_empty</span>()
}
<span class="doccomment">/// Attempts to obtain a "local" job -- typically this means</span>
<span class="doccomment">/// popping from the top of the stack, though if we are configured</span>
<span class="doccomment">/// for breadth-first execution, it would mean dequeuing from the</span>
<span class="doccomment">/// bottom.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">take_local_job</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">popped_job</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">worker</span>.<span class="ident">pop</span>();
<span class="kw">if</span> <span class="ident">popped_job</span>.<span class="ident">is_some</span>() {
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">JobPopped</span> { <span class="ident">worker</span>: <span class="self">self</span>.<span class="ident">index</span> });
}
<span class="ident">popped_job</span>
}
<span class="doccomment">/// Wait until the latch is set. Try to keep busy by popping and</span>
<span class="doccomment">/// stealing tasks as necessary.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wait_until</span><span class="op"><</span><span class="ident">L</span>: <span class="ident">AsCoreLatch</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">latch</span>: <span class="kw-2">&</span><span class="ident">L</span>) {
<span class="kw">let</span> <span class="ident">latch</span> <span class="op">=</span> <span class="ident">latch</span>.<span class="ident">as_core_latch</span>();
<span class="kw">if</span> <span class="op">!</span><span class="ident">latch</span>.<span class="ident">probe</span>() {
<span class="self">self</span>.<span class="ident">wait_until_cold</span>(<span class="ident">latch</span>);
}
}
<span class="attribute">#[<span class="ident">cold</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wait_until_cold</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">latch</span>: <span class="kw-2">&</span><span class="ident">CoreLatch</span>) {
<span class="comment">// the code below should swallow all panics and hence never</span>
<span class="comment">// unwind; but if something does wrong, we want to abort,</span>
<span class="comment">// because otherwise other code in rayon may assume that the</span>
<span class="comment">// latch has been signaled, and that can lead to random memory</span>
<span class="comment">// accesses, which would be *very bad*</span>
<span class="kw">let</span> <span class="ident">abort_guard</span> <span class="op">=</span> <span class="ident">unwind::AbortIfPanic</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">idle_state</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">sleep</span>.<span class="ident">start_looking</span>(<span class="self">self</span>.<span class="ident">index</span>, <span class="ident">latch</span>);
<span class="kw">while</span> <span class="op">!</span><span class="ident">latch</span>.<span class="ident">probe</span>() {
<span class="comment">// Try to find some work to do. We give preference first</span>
<span class="comment">// to things in our local deque, then in other workers</span>
<span class="comment">// deques, and finally to injected jobs from the</span>
<span class="comment">// outside. The idea is to finish what we started before</span>
<span class="comment">// we take on something new.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">job</span>) <span class="op">=</span> <span class="self">self</span>
.<span class="ident">take_local_job</span>()
.<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">steal</span>())
.<span class="ident">or_else</span>(<span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">pop_injected_job</span>(<span class="self">self</span>.<span class="ident">index</span>))
{
<span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">sleep</span>.<span class="ident">work_found</span>(<span class="ident">idle_state</span>);
<span class="self">self</span>.<span class="ident">execute</span>(<span class="ident">job</span>);
<span class="ident">idle_state</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">sleep</span>.<span class="ident">start_looking</span>(<span class="self">self</span>.<span class="ident">index</span>, <span class="ident">latch</span>);
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">registry</span>
.<span class="ident">sleep</span>
.<span class="ident">no_work_found</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">idle_state</span>, <span class="ident">latch</span>, <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">has_injected_job</span>())
}
}
<span class="comment">// If we were sleepy, we are not anymore. We "found work" --</span>
<span class="comment">// whatever the surrounding thread was doing before it had to</span>
<span class="comment">// wait.</span>
<span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">sleep</span>.<span class="ident">work_found</span>(<span class="ident">idle_state</span>);
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ThreadSawLatchSet</span> {
<span class="ident">worker</span>: <span class="self">self</span>.<span class="ident">index</span>,
<span class="ident">latch_addr</span>: <span class="ident">latch</span>.<span class="ident">addr</span>(),
});
<span class="ident">mem::forget</span>(<span class="ident">abort_guard</span>); <span class="comment">// successful execution, do not abort</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">execute</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">job</span>: <span class="ident">JobRef</span>) {
<span class="ident">job</span>.<span class="ident">execute</span>();
}
<span class="doccomment">/// Try to steal a single job and return it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This should only be done as a last resort, when there is no</span>
<span class="doccomment">/// local work to do.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">steal</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span> {
<span class="comment">// we only steal when we don't have any work to do locally</span>
<span class="macro">debug_assert!</span>(<span class="self">self</span>.<span class="ident">local_deque_is_empty</span>());
<span class="comment">// otherwise, try to steal</span>
<span class="kw">let</span> <span class="ident">thread_infos</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">registry</span>.<span class="ident">thread_infos</span>.<span class="ident">as_slice</span>();
<span class="kw">let</span> <span class="ident">num_threads</span> <span class="op">=</span> <span class="ident">thread_infos</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">num_threads</span> <span class="op"><</span><span class="op">=</span> <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> <span class="ident">retry</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">rng</span>.<span class="ident">next_usize</span>(<span class="ident">num_threads</span>);
<span class="kw">let</span> <span class="ident">job</span> <span class="op">=</span> (<span class="ident">start</span>..<span class="ident">num_threads</span>)
.<span class="ident">chain</span>(<span class="number">0</span>..<span class="ident">start</span>)
.<span class="ident">filter</span>(<span class="kw">move</span> <span class="op">|</span><span class="kw-2">&</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span> <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">index</span>)
.<span class="ident">find_map</span>(<span class="op">|</span><span class="ident">victim_index</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">victim</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">thread_infos</span>[<span class="ident">victim_index</span>];
<span class="kw">match</span> <span class="ident">victim</span>.<span class="ident">stealer</span>.<span class="ident">steal</span>() {
<span class="ident">Steal::Success</span>(<span class="ident">job</span>) <span class="op">=</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">JobStolen</span> {
<span class="ident">worker</span>: <span class="self">self</span>.<span class="ident">index</span>,
<span class="ident">victim</span>: <span class="ident">victim_index</span>,
});
<span class="prelude-val">Some</span>(<span class="ident">job</span>)
}
<span class="ident">Steal::Empty</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="ident">Steal::Retry</span> <span class="op">=</span><span class="op">></span> {
<span class="ident">retry</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="prelude-val">None</span>
}
}
});
<span class="kw">if</span> <span class="ident">job</span>.<span class="ident">is_some</span>() <span class="op">|</span><span class="op">|</span> <span class="op">!</span><span class="ident">retry</span> {
<span class="kw">return</span> <span class="ident">job</span>;
}
}
}
}
<span class="doccomment">/// ////////////////////////////////////////////////////////////////////////</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">main_loop</span>(<span class="ident">worker</span>: <span class="ident">Worker</span><span class="op"><</span><span class="ident">JobRef</span><span class="op">></span>, <span class="ident">registry</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Registry</span><span class="op">></span>, <span class="ident">index</span>: <span class="ident">usize</span>) {
<span class="kw">let</span> <span class="ident">worker_thread</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">WorkerThread</span> {
<span class="ident">worker</span>,
<span class="ident">fifo</span>: <span class="ident">JobFifo::new</span>(),
<span class="ident">index</span>,
<span class="ident">rng</span>: <span class="ident">XorShift64Star::new</span>(),
<span class="ident">registry</span>: <span class="ident">registry</span>.<span class="ident">clone</span>(),
};
<span class="ident">WorkerThread::set_current</span>(<span class="ident">worker_thread</span>);
<span class="comment">// let registry know we are ready to do work</span>
<span class="ident">registry</span>.<span class="ident">thread_infos</span>[<span class="ident">index</span>].<span class="ident">primed</span>.<span class="ident">set</span>();
<span class="comment">// Worker threads should not panic. If they do, just abort, as the</span>
<span class="comment">// internal state of the threadpool is corrupted. Note that if</span>
<span class="comment">// **user code** panics, we should catch that and redirect.</span>
<span class="kw">let</span> <span class="ident">abort_guard</span> <span class="op">=</span> <span class="ident">unwind::AbortIfPanic</span>;
<span class="comment">// Inform a user callback that we started a thread.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">handler</span>) <span class="op">=</span> <span class="ident">registry</span>.<span class="ident">start_handler</span> {
<span class="kw">let</span> <span class="ident">registry</span> <span class="op">=</span> <span class="ident">registry</span>.<span class="ident">clone</span>();
<span class="kw">match</span> <span class="ident">unwind::halt_unwinding</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">handler</span>(<span class="ident">index</span>)) {
<span class="prelude-val">Ok</span>(()) <span class="op">=</span><span class="op">></span> {}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">registry</span>.<span class="ident">handle_panic</span>(<span class="ident">err</span>);
}
}
}
<span class="kw">let</span> <span class="ident">my_terminate_latch</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">registry</span>.<span class="ident">thread_infos</span>[<span class="ident">index</span>].<span class="ident">terminate</span>;
<span class="ident">worker_thread</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ThreadStart</span> {
<span class="ident">worker</span>: <span class="ident">index</span>,
<span class="ident">terminate_addr</span>: <span class="ident">my_terminate_latch</span>.<span class="ident">as_core_latch</span>().<span class="ident">addr</span>(),
});
<span class="ident">worker_thread</span>.<span class="ident">wait_until</span>(<span class="ident">my_terminate_latch</span>);
<span class="comment">// Should not be any work left in our queue.</span>
<span class="macro">debug_assert!</span>(<span class="ident">worker_thread</span>.<span class="ident">take_local_job</span>().<span class="ident">is_none</span>());
<span class="comment">// let registry know we are done</span>
<span class="ident">registry</span>.<span class="ident">thread_infos</span>[<span class="ident">index</span>].<span class="ident">stopped</span>.<span class="ident">set</span>();
<span class="comment">// Normal termination, do not abort.</span>
<span class="ident">mem::forget</span>(<span class="ident">abort_guard</span>);
<span class="ident">worker_thread</span>.<span class="ident">log</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">ThreadTerminate</span> { <span class="ident">worker</span>: <span class="ident">index</span> });
<span class="comment">// Inform a user callback that we exited a thread.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">handler</span>) <span class="op">=</span> <span class="ident">registry</span>.<span class="ident">exit_handler</span> {
<span class="kw">let</span> <span class="ident">registry</span> <span class="op">=</span> <span class="ident">registry</span>.<span class="ident">clone</span>();
<span class="kw">match</span> <span class="ident">unwind::halt_unwinding</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">handler</span>(<span class="ident">index</span>)) {
<span class="prelude-val">Ok</span>(()) <span class="op">=</span><span class="op">></span> {}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">registry</span>.<span class="ident">handle_panic</span>(<span class="ident">err</span>);
}
}
<span class="comment">// We're already exiting the thread, there's nothing else to do.</span>
}
}
<span class="doccomment">/// If already in a worker-thread, just execute `op`. Otherwise,</span>
<span class="doccomment">/// execute `op` in the default thread-pool. Either way, block until</span>
<span class="doccomment">/// `op` completes and return its return value. If `op` panics, that</span>
<span class="doccomment">/// panic will be propagated as well. The second argument indicates</span>
<span class="doccomment">/// `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> <span class="ident">in_worker</span><span class="op"><</span><span class="ident">OP</span>, <span class="ident">R</span><span class="op">></span>(<span class="ident">op</span>: <span class="ident">OP</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>
<span class="kw">where</span>
<span class="ident">OP</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">WorkerThread</span>, <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">R</span>: <span class="ident">Send</span>,
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">owner_thread</span> <span class="op">=</span> <span class="ident">WorkerThread::current</span>();
<span class="kw">if</span> <span class="op">!</span><span class="ident">owner_thread</span>.<span class="ident">is_null</span>() {
<span class="comment">// Perfectly valid to give them a `&T`: this is the</span>
<span class="comment">// current thread, so we know the data structure won't be</span>
<span class="comment">// invalidated until we return.</span>
<span class="ident">op</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">owner_thread</span>, <span class="bool-val">false</span>)
} <span class="kw">else</span> {
<span class="ident">global_registry</span>().<span class="ident">in_worker_cold</span>(<span class="ident">op</span>)
}
}
}
<span class="doccomment">/// [xorshift*] is a fast pseudorandom number generator which will</span>
<span class="doccomment">/// even tolerate weak seeding, as long as it's not zero.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [xorshift*]: https://en.wikipedia.org/wiki/Xorshift#xorshift*</span>
<span class="kw">struct</span> <span class="ident">XorShift64Star</span> {
<span class="ident">state</span>: <span class="ident">Cell</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">XorShift64Star</span> {
<span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <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> <span class="ident">seed</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">while</span> <span class="ident">seed</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">DefaultHasher::new</span>();
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">static</span> <span class="ident">COUNTER</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ATOMIC_USIZE_INIT</span>;
<span class="ident">hasher</span>.<span class="ident">write_usize</span>(<span class="ident">COUNTER</span>.<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Ordering::Relaxed</span>));
<span class="ident">seed</span> <span class="op">=</span> <span class="ident">hasher</span>.<span class="ident">finish</span>();
}
<span class="ident">XorShift64Star</span> {
<span class="ident">state</span>: <span class="ident">Cell::new</span>(<span class="ident">seed</span>),
}
}
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">state</span>.<span class="ident">get</span>();
<span class="macro">debug_assert_ne!</span>(<span class="ident">x</span>, <span class="number">0</span>);
<span class="ident">x</span> <span class="op">^</span><span class="op">=</span> <span class="ident">x</span> <span class="op">></span><span class="op">></span> <span class="number">12</span>;
<span class="ident">x</span> <span class="op">^</span><span class="op">=</span> <span class="ident">x</span> <span class="op"><</span><span class="op"><</span> <span class="number">25</span>;
<span class="ident">x</span> <span class="op">^</span><span class="op">=</span> <span class="ident">x</span> <span class="op">></span><span class="op">></span> <span class="number">27</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">set</span>(<span class="ident">x</span>);
<span class="ident">x</span>.<span class="ident">wrapping_mul</span>(<span class="number">0x2545_f491_4f6c_dd1d</span>)
}
<span class="doccomment">/// Return a value from `0..n`.</span>
<span class="kw">fn</span> <span class="ident">next_usize</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
(<span class="self">self</span>.<span class="ident">next</span>() <span class="op">%</span> <span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="kw">as</span> <span class="ident">usize</span>
}
}
</pre></div>
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