| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.28.2/src/runtime/io/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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="../../../../tokio/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="../../../../tokio/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="attribute">#![cfg_attr(not(all(feature = <span class="string">"rt"</span>, feature = <span class="string">"net"</span>)), allow(dead_code))] |
| |
| </span><span class="kw">mod </span>registration; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>registration::Registration; |
| |
| <span class="kw">mod </span>scheduled_io; |
| <span class="kw">use </span>scheduled_io::ScheduledIo; |
| |
| <span class="kw">mod </span>metrics; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::io::interest::Interest; |
| <span class="kw">use </span><span class="kw">crate</span>::io::ready::Ready; |
| <span class="kw">use </span><span class="kw">crate</span>::runtime::driver; |
| <span class="kw">use </span><span class="kw">crate</span>::util::slab::{<span class="self">self</span>, Slab}; |
| <span class="kw">use crate</span>::{loom::sync::RwLock, util::bit}; |
| |
| <span class="kw">use </span>metrics::IoDriverMetrics; |
| |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="doccomment">/// I/O driver, backed by Mio. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Driver { |
| <span class="doccomment">/// Tracks the number of times `turn` is called. It is safe for this to wrap |
| /// as it is mostly used to determine when to call `compact()`. |
| </span>tick: u8, |
| |
| <span class="doccomment">/// True when an event with the signal token is received |
| </span>signal_ready: bool, |
| |
| <span class="doccomment">/// Reuse the `mio::Events` value across calls to poll. |
| </span>events: mio::Events, |
| |
| <span class="doccomment">/// Primary slab handle containing the state for each resource registered |
| /// with this driver. |
| </span>resources: Slab<ScheduledIo>, |
| |
| <span class="doccomment">/// The system event queue. |
| </span>poll: mio::Poll, |
| } |
| |
| <span class="doccomment">/// A reference to an I/O driver. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Handle { |
| <span class="doccomment">/// Registers I/O resources. |
| </span>registry: mio::Registry, |
| |
| <span class="doccomment">/// Allocates `ScheduledIo` handles when creating new resources. |
| </span>io_dispatch: RwLock<IoDispatcher>, |
| |
| <span class="doccomment">/// Used to wake up the reactor from a call to `turn`. |
| /// Not supported on Wasi due to lack of threading support. |
| </span><span class="attribute">#[cfg(not(tokio_wasi))] |
| </span>waker: mio::Waker, |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) metrics: IoDriverMetrics, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>ReadyEvent { |
| tick: u8, |
| <span class="kw">pub</span>(<span class="kw">crate</span>) ready: Ready, |
| is_shutdown: bool, |
| } |
| |
| <span class="kw">struct </span>IoDispatcher { |
| allocator: slab::Allocator<ScheduledIo>, |
| is_shutdown: bool, |
| } |
| |
| <span class="attribute">#[derive(Debug, Eq, PartialEq, Clone, Copy)] |
| </span><span class="kw">enum </span>Direction { |
| Read, |
| Write, |
| } |
| |
| <span class="kw">enum </span>Tick { |
| Set(u8), |
| Clear(u8), |
| } |
| |
| <span class="comment">// TODO: Don't use a fake token. Instead, reserve a slot entry for the wakeup |
| // token. |
| </span><span class="kw">const </span>TOKEN_WAKEUP: mio::Token = mio::Token(<span class="number">1 </span><< <span class="number">31</span>); |
| <span class="kw">const </span>TOKEN_SIGNAL: mio::Token = mio::Token(<span class="number">1 </span>+ (<span class="number">1 </span><< <span class="number">31</span>)); |
| |
| <span class="kw">const </span>ADDRESS: bit::Pack = bit::Pack::least_significant(<span class="number">24</span>); |
| |
| <span class="comment">// Packs the generation value in the `readiness` field. |
| // |
| // The generation prevents a race condition where a slab slot is reused for a |
| // new socket while the I/O driver is about to apply a readiness event. The |
| // generation value is checked when setting new readiness. If the generation do |
| // not match, then the readiness event is discarded. |
| </span><span class="kw">const </span>GENERATION: bit::Pack = ADDRESS.then(<span class="number">7</span>); |
| |
| <span class="kw">fn </span>_assert_kinds() { |
| <span class="kw">fn </span>_assert<T: Send + Sync>() {} |
| |
| _assert::<Handle>(); |
| } |
| |
| <span class="comment">// ===== impl Driver ===== |
| |
| </span><span class="kw">impl </span>Driver { |
| <span class="doccomment">/// Creates a new event loop, returning any error that happened during the |
| /// creation. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(nevents: usize) -> io::Result<(Driver, Handle)> { |
| <span class="kw">let </span>poll = mio::Poll::new()<span class="question-mark">?</span>; |
| <span class="attribute">#[cfg(not(tokio_wasi))] |
| </span><span class="kw">let </span>waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)<span class="question-mark">?</span>; |
| <span class="kw">let </span>registry = poll.registry().try_clone()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>slab = Slab::new(); |
| <span class="kw">let </span>allocator = slab.allocator(); |
| |
| <span class="kw">let </span>driver = Driver { |
| tick: <span class="number">0</span>, |
| signal_ready: <span class="bool-val">false</span>, |
| events: mio::Events::with_capacity(nevents), |
| poll, |
| resources: slab, |
| }; |
| |
| <span class="kw">let </span>handle = Handle { |
| registry, |
| io_dispatch: RwLock::new(IoDispatcher::new(allocator)), |
| <span class="attribute">#[cfg(not(tokio_wasi))] |
| </span>waker, |
| metrics: IoDriverMetrics::default(), |
| }; |
| |
| <span class="prelude-val">Ok</span>((driver, handle)) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>park(<span class="kw-2">&mut </span><span class="self">self</span>, rt_handle: <span class="kw-2">&</span>driver::Handle) { |
| <span class="kw">let </span>handle = rt_handle.io(); |
| <span class="self">self</span>.turn(handle, <span class="prelude-val">None</span>); |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>park_timeout(<span class="kw-2">&mut </span><span class="self">self</span>, rt_handle: <span class="kw-2">&</span>driver::Handle, duration: Duration) { |
| <span class="kw">let </span>handle = rt_handle.io(); |
| <span class="self">self</span>.turn(handle, <span class="prelude-val">Some</span>(duration)); |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>shutdown(<span class="kw-2">&mut </span><span class="self">self</span>, rt_handle: <span class="kw-2">&</span>driver::Handle) { |
| <span class="kw">let </span>handle = rt_handle.io(); |
| |
| <span class="kw">if </span>handle.shutdown() { |
| <span class="self">self</span>.resources.for_each(|io| { |
| <span class="comment">// If a task is waiting on the I/O resource, notify it that the |
| // runtime is being shutdown. And shutdown will clear all wakers. |
| </span>io.shutdown(); |
| }); |
| } |
| } |
| |
| <span class="kw">fn </span>turn(<span class="kw-2">&mut </span><span class="self">self</span>, handle: <span class="kw-2">&</span>Handle, max_wait: <span class="prelude-ty">Option</span><Duration>) { |
| <span class="comment">// How often to call `compact()` on the resource slab |
| </span><span class="kw">const </span>COMPACT_INTERVAL: u8 = <span class="number">255</span>; |
| |
| <span class="self">self</span>.tick = <span class="self">self</span>.tick.wrapping_add(<span class="number">1</span>); |
| |
| <span class="kw">if </span><span class="self">self</span>.tick == COMPACT_INTERVAL { |
| <span class="self">self</span>.resources.compact() |
| } |
| |
| <span class="kw">let </span>events = <span class="kw-2">&mut </span><span class="self">self</span>.events; |
| |
| <span class="comment">// Block waiting for an event to happen, peeling out how many events |
| // happened. |
| </span><span class="kw">match </span><span class="self">self</span>.poll.poll(events, max_wait) { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) => {} |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) <span class="kw">if </span>e.kind() == io::ErrorKind::Interrupted => {} |
| <span class="attribute">#[cfg(tokio_wasi)] |
| </span><span class="prelude-val">Err</span>(e) <span class="kw">if </span>e.kind() == io::ErrorKind::InvalidInput => { |
| <span class="comment">// In case of wasm32_wasi this error happens, when trying to poll without subscriptions |
| // just return from the park, as there would be nothing, which wakes us up. |
| </span>} |
| <span class="prelude-val">Err</span>(e) => <span class="macro">panic!</span>(<span class="string">"unexpected error when polling the I/O driver: {:?}"</span>, e), |
| } |
| |
| <span class="comment">// Process all the events that came in, dispatching appropriately |
| </span><span class="kw">let </span><span class="kw-2">mut </span>ready_count = <span class="number">0</span>; |
| <span class="kw">for </span>event <span class="kw">in </span>events.iter() { |
| <span class="kw">let </span>token = event.token(); |
| |
| <span class="kw">if </span>token == TOKEN_WAKEUP { |
| <span class="comment">// Nothing to do, the event is used to unblock the I/O driver |
| </span>} <span class="kw">else if </span>token == TOKEN_SIGNAL { |
| <span class="self">self</span>.signal_ready = <span class="bool-val">true</span>; |
| } <span class="kw">else </span>{ |
| <span class="self">Self</span>::dispatch( |
| <span class="kw-2">&mut </span><span class="self">self</span>.resources, |
| <span class="self">self</span>.tick, |
| token, |
| Ready::from_mio(event), |
| ); |
| ready_count += <span class="number">1</span>; |
| } |
| } |
| |
| handle.metrics.incr_ready_count_by(ready_count); |
| } |
| |
| <span class="kw">fn </span>dispatch(resources: <span class="kw-2">&mut </span>Slab<ScheduledIo>, tick: u8, token: mio::Token, ready: Ready) { |
| <span class="kw">let </span>addr = slab::Address::from_usize(ADDRESS.unpack(token.<span class="number">0</span>)); |
| |
| <span class="kw">let </span>io = <span class="kw">match </span>resources.get(addr) { |
| <span class="prelude-val">Some</span>(io) => io, |
| <span class="prelude-val">None </span>=> <span class="kw">return</span>, |
| }; |
| |
| <span class="kw">let </span>res = io.set_readiness(<span class="prelude-val">Some</span>(token.<span class="number">0</span>), Tick::Set(tick), |curr| curr | ready); |
| |
| <span class="kw">if </span>res.is_err() { |
| <span class="comment">// token no longer valid! |
| </span><span class="kw">return</span>; |
| } |
| |
| io.wake(ready); |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Driver { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"Driver"</span>) |
| } |
| } |
| |
| <span class="kw">impl </span>Handle { |
| <span class="doccomment">/// Forces a reactor blocked in a call to `turn` to wakeup, or otherwise |
| /// makes the next call to `turn` return immediately. |
| /// |
| /// This method is intended to be used in situations where a notification |
| /// needs to otherwise be sent to the main reactor. If the reactor is |
| /// currently blocked inside of `turn` then it will wake up and soon return |
| /// after this method has been called. If the reactor is not currently |
| /// blocked in `turn`, then the next call to `turn` will not block and |
| /// return immediately. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unpark(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="attribute">#[cfg(not(tokio_wasi))] |
| </span><span class="self">self</span>.waker.wake().expect(<span class="string">"failed to wake I/O driver"</span>); |
| } |
| |
| <span class="doccomment">/// Registers an I/O resource with the reactor for a given `mio::Ready` state. |
| /// |
| /// The registration token is returned. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>add_source( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| source: <span class="kw-2">&mut </span><span class="kw">impl </span>mio::event::Source, |
| interest: Interest, |
| ) -> io::Result<slab::Ref<ScheduledIo>> { |
| <span class="kw">let </span>(address, shared) = <span class="self">self</span>.allocate()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>token = GENERATION.pack(shared.generation(), ADDRESS.pack(address.as_usize(), <span class="number">0</span>)); |
| |
| <span class="self">self</span>.registry |
| .register(source, mio::Token(token), interest.to_mio())<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.metrics.incr_fd_count(); |
| |
| <span class="prelude-val">Ok</span>(shared) |
| } |
| |
| <span class="doccomment">/// Deregisters an I/O resource from the reactor. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>deregister_source(<span class="kw-2">&</span><span class="self">self</span>, source: <span class="kw-2">&mut </span><span class="kw">impl </span>mio::event::Source) -> io::Result<()> { |
| <span class="self">self</span>.registry.deregister(source)<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.metrics.dec_fd_count(); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// shutdown the dispatcher. |
| </span><span class="kw">fn </span>shutdown(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">let </span><span class="kw-2">mut </span>io = <span class="self">self</span>.io_dispatch.write().unwrap(); |
| <span class="kw">if </span>io.is_shutdown { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| io.is_shutdown = <span class="bool-val">true</span>; |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="kw">fn </span>allocate(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<(slab::Address, slab::Ref<ScheduledIo>)> { |
| <span class="kw">let </span>io = <span class="self">self</span>.io_dispatch.read().unwrap(); |
| <span class="kw">if </span>io.is_shutdown { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::Other, |
| <span class="kw">crate</span>::util::error::RUNTIME_SHUTTING_DOWN_ERROR, |
| )); |
| } |
| io.allocator.allocate().ok_or_else(|| { |
| io::Error::new( |
| io::ErrorKind::Other, |
| <span class="string">"reactor at max registered I/O resources"</span>, |
| ) |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Handle { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="macro">write!</span>(f, <span class="string">"Handle"</span>) |
| } |
| } |
| |
| <span class="comment">// ===== impl IoDispatcher ===== |
| |
| </span><span class="kw">impl </span>IoDispatcher { |
| <span class="kw">fn </span>new(allocator: slab::Allocator<ScheduledIo>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| allocator, |
| is_shutdown: <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Direction { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>mask(<span class="self">self</span>) -> Ready { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Direction::Read => Ready::READABLE | Ready::READ_CLOSED, |
| Direction::Write => Ready::WRITABLE | Ready::WRITE_CLOSED, |
| } |
| } |
| } |
| |
| <span class="comment">// Signal handling |
| </span><span class="macro">cfg_signal_internal_and_unix! </span>{ |
| <span class="kw">impl </span>Handle { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>register_signal_receiver(<span class="kw-2">&</span><span class="self">self</span>, receiver: <span class="kw-2">&mut </span>mio::net::UnixStream) -> io::Result<()> { |
| <span class="self">self</span>.registry.register(receiver, TOKEN_SIGNAL, mio::Interest::READABLE)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Driver { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>consume_signal_ready(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">let </span>ret = <span class="self">self</span>.signal_ready; |
| <span class="self">self</span>.signal_ready = <span class="bool-val">false</span>; |
| ret |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tokio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
