| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/tokio-377c595163f99a10/dfe252d/tokio/src/runtime/io/registration.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>registration.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(feature = <span class="string">"net"</span>), allow(dead_code))] |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::io::interest::Interest; |
| <span class="kw">use </span><span class="kw">crate</span>::runtime::io::{Direction, Handle, ReadyEvent, ScheduledIo}; |
| <span class="kw">use </span><span class="kw">crate</span>::runtime::scheduler; |
| <span class="kw">use </span><span class="kw">crate</span>::util::slab; |
| |
| <span class="kw">use </span>mio::event::Source; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="macro">cfg_io_driver! </span>{ |
| <span class="doccomment">/// Associates an I/O resource with the reactor instance that drives it. |
| /// |
| /// A registration represents an I/O resource registered with a Reactor such |
| /// that it will receive task notifications on readiness. This is the lowest |
| /// level API for integrating with a reactor. |
| /// |
| /// The association between an I/O resource is made by calling |
| /// [`new_with_interest_and_handle`]. |
| /// Once the association is established, it remains established until the |
| /// registration instance is dropped. |
| /// |
| /// A registration instance represents two separate readiness streams. One |
| /// for the read readiness and one for write readiness. These streams are |
| /// independent and can be consumed from separate tasks. |
| /// |
| /// **Note**: while `Registration` is `Sync`, the caller must ensure that |
| /// there are at most two tasks that use a registration instance |
| /// concurrently. One task for [`poll_read_ready`] and one task for |
| /// [`poll_write_ready`]. While violating this requirement is "safe" from a |
| /// Rust memory safety point of view, it will result in unexpected behavior |
| /// in the form of lost notifications and tasks hanging. |
| /// |
| /// ## Platform-specific events |
| /// |
| /// `Registration` also allows receiving platform-specific `mio::Ready` |
| /// events. These events are included as part of the read readiness event |
| /// stream. The write readiness event stream is only for `Ready::writable()` |
| /// events. |
| /// |
| /// [`new_with_interest_and_handle`]: method@Self::new_with_interest_and_handle |
| /// [`poll_read_ready`]: method@Self::poll_read_ready` |
| /// [`poll_write_ready`]: method@Self::poll_write_ready` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Registration { |
| <span class="doccomment">/// Handle to the associated runtime. |
| </span>handle: scheduler::Handle, |
| |
| <span class="doccomment">/// Reference to state stored by the driver. |
| </span>shared: slab::Ref<ScheduledIo>, |
| } |
| } |
| |
| <span class="kw">unsafe impl </span>Send <span class="kw">for </span>Registration {} |
| <span class="kw">unsafe impl </span>Sync <span class="kw">for </span>Registration {} |
| |
| <span class="comment">// ===== impl Registration ===== |
| |
| </span><span class="kw">impl </span>Registration { |
| <span class="doccomment">/// Registers the I/O resource with the reactor for the provided handle, for |
| /// a specific `Interest`. This does not add `hup` or `error` so if you are |
| /// interested in those states, you will need to add them to the readiness |
| /// state passed to this function. |
| /// |
| /// # Return |
| /// |
| /// - `Ok` if the registration happened successfully |
| /// - `Err` if an error was encountered during registration |
| </span><span class="attribute">#[track_caller] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new_with_interest_and_handle( |
| io: <span class="kw-2">&mut </span><span class="kw">impl </span>Source, |
| interest: Interest, |
| handle: scheduler::Handle, |
| ) -> io::Result<Registration> { |
| <span class="kw">let </span>shared = handle.driver().io().add_source(io, interest)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(Registration { handle, shared }) |
| } |
| |
| <span class="doccomment">/// Deregisters the I/O resource from the reactor it is associated with. |
| /// |
| /// This function must be called before the I/O resource associated with the |
| /// registration is dropped. |
| /// |
| /// Note that deregistering does not guarantee that the I/O resource can be |
| /// registered with a different reactor. Some I/O resource types can only be |
| /// associated with a single reactor instance for their lifetime. |
| /// |
| /// # Return |
| /// |
| /// If the deregistration was successful, `Ok` is returned. Any calls to |
| /// `Reactor::turn` that happen after a successful call to `deregister` will |
| /// no longer result in notifications getting sent for this registration. |
| /// |
| /// `Err` is returned if an error is encountered. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>deregister(<span class="kw-2">&mut </span><span class="self">self</span>, io: <span class="kw-2">&mut </span><span class="kw">impl </span>Source) -> io::Result<()> { |
| <span class="self">self</span>.handle().deregister_source(io) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>clear_readiness(<span class="kw-2">&</span><span class="self">self</span>, event: ReadyEvent) { |
| <span class="self">self</span>.shared.clear_readiness(event); |
| } |
| |
| <span class="comment">// Uses the poll path, requiring the caller to ensure mutual exclusion for |
| // correctness. Only the last task to call this function is notified. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_read_ready(<span class="kw-2">&</span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<ReadyEvent>> { |
| <span class="self">self</span>.poll_ready(cx, Direction::Read) |
| } |
| |
| <span class="comment">// Uses the poll path, requiring the caller to ensure mutual exclusion for |
| // correctness. Only the last task to call this function is notified. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_write_ready(<span class="kw-2">&</span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<ReadyEvent>> { |
| <span class="self">self</span>.poll_ready(cx, Direction::Write) |
| } |
| |
| <span class="comment">// Uses the poll path, requiring the caller to ensure mutual exclusion for |
| // correctness. Only the last task to call this function is notified. |
| </span><span class="attribute">#[cfg(not(tokio_wasi))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_read_io<R>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| f: <span class="kw">impl </span>FnMut() -> io::Result<R>, |
| ) -> Poll<io::Result<R>> { |
| <span class="self">self</span>.poll_io(cx, Direction::Read, f) |
| } |
| |
| <span class="comment">// Uses the poll path, requiring the caller to ensure mutual exclusion for |
| // correctness. Only the last task to call this function is notified. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_write_io<R>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| f: <span class="kw">impl </span>FnMut() -> io::Result<R>, |
| ) -> Poll<io::Result<R>> { |
| <span class="self">self</span>.poll_io(cx, Direction::Write, f) |
| } |
| |
| <span class="doccomment">/// Polls for events on the I/O resource's `direction` readiness stream. |
| /// |
| /// If called with a task context, notify the task when a new event is |
| /// received. |
| </span><span class="kw">fn </span>poll_ready( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| direction: Direction, |
| ) -> Poll<io::Result<ReadyEvent>> { |
| <span class="comment">// Keep track of task budget |
| </span><span class="kw">let </span>coop = <span class="macro">ready!</span>(<span class="kw">crate</span>::runtime::coop::poll_proceed(cx)); |
| <span class="kw">let </span>ev = <span class="macro">ready!</span>(<span class="self">self</span>.shared.poll_readiness(cx, direction)); |
| |
| <span class="kw">if </span>ev.is_shutdown { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(gone())); |
| } |
| |
| coop.made_progress(); |
| Poll::Ready(<span class="prelude-val">Ok</span>(ev)) |
| } |
| |
| <span class="kw">fn </span>poll_io<R>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| direction: Direction, |
| <span class="kw-2">mut </span>f: <span class="kw">impl </span>FnMut() -> io::Result<R>, |
| ) -> Poll<io::Result<R>> { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>ev = <span class="macro">ready!</span>(<span class="self">self</span>.poll_ready(cx, direction))<span class="question-mark">?</span>; |
| |
| <span class="kw">match </span>f() { |
| <span class="prelude-val">Ok</span>(ret) => { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(ret)); |
| } |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) <span class="kw">if </span>e.kind() == io::ErrorKind::WouldBlock => { |
| <span class="self">self</span>.clear_readiness(ev); |
| } |
| <span class="prelude-val">Err</span>(e) => <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(e)), |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>try_io<R>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| interest: Interest, |
| f: <span class="kw">impl </span>FnOnce() -> io::Result<R>, |
| ) -> io::Result<R> { |
| <span class="kw">let </span>ev = <span class="self">self</span>.shared.ready_event(interest); |
| |
| <span class="comment">// Don't attempt the operation if the resource is not ready. |
| </span><span class="kw">if </span>ev.ready.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(io::ErrorKind::WouldBlock.into()); |
| } |
| |
| <span class="kw">match </span>f() { |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) <span class="kw">if </span>e.kind() == io::ErrorKind::WouldBlock => { |
| <span class="self">self</span>.clear_readiness(ev); |
| <span class="prelude-val">Err</span>(io::ErrorKind::WouldBlock.into()) |
| } |
| res => res, |
| } |
| } |
| |
| <span class="kw">fn </span>handle(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Handle { |
| <span class="self">self</span>.handle.driver().io() |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Registration { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// It is possible for a cycle to be created between wakers stored in |
| // `ScheduledIo` instances and `Arc<driver::Inner>`. To break this |
| // cycle, wakers are cleared. This is an imperfect solution as it is |
| // possible to store a `Registration` in a waker. In this case, the |
| // cycle would remain. |
| // |
| // See tokio-rs/tokio#3481 for more details. |
| </span><span class="self">self</span>.shared.clear_wakers(); |
| } |
| } |
| |
| <span class="kw">fn </span>gone() -> io::Error { |
| io::Error::new( |
| io::ErrorKind::Other, |
| <span class="kw">crate</span>::util::error::RUNTIME_SHUTTING_DOWN_ERROR, |
| ) |
| } |
| |
| <span class="macro">cfg_io_readiness! </span>{ |
| <span class="kw">impl </span>Registration { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">async fn </span>readiness(<span class="kw-2">&</span><span class="self">self</span>, interest: Interest) -> io::Result<ReadyEvent> { |
| <span class="kw">let </span>ev = <span class="self">self</span>.shared.readiness(interest).<span class="kw">await</span>; |
| |
| <span class="kw">if </span>ev.is_shutdown { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(gone()) |
| } |
| |
| <span class="prelude-val">Ok</span>(ev) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">async fn </span>async_io<R>(<span class="kw-2">&</span><span class="self">self</span>, interest: Interest, <span class="kw-2">mut </span>f: <span class="kw">impl </span>FnMut() -> io::Result<R>) -> io::Result<R> { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>event = <span class="self">self</span>.readiness(interest).<span class="kw">await</span><span class="question-mark">?</span>; |
| |
| <span class="kw">match </span>f() { |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) <span class="kw">if </span>e.kind() == io::ErrorKind::WouldBlock => { |
| <span class="self">self</span>.clear_readiness(event); |
| } |
| x => <span class="kw">return </span>x, |
| } |
| } |
| } |
| } |
| } |
| </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> |