| <!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/incubator-teaclave-crates-c8106113f74feefc/ede1f68/mio/src/io_source.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>io_source.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="../../mio/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="../../mio/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::ops::{Deref, DerefMut}; |
| <span class="attribute">#[cfg(unix)] |
| </span><span class="kw">use </span>std::os::unix::io::AsRawFd; |
| <span class="attribute">#[cfg(target_os = <span class="string">"wasi"</span>)] |
| </span><span class="kw">use </span>std::os::wasi::io::AsRawFd; |
| <span class="attribute">#[cfg(windows)] |
| </span><span class="kw">use </span>std::os::windows::io::AsRawSocket; |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">use </span>std::sync::atomic::{AtomicUsize, Ordering}; |
| <span class="kw">use </span>std::{fmt, io}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::sys::IoSourceState; |
| <span class="kw">use crate</span>::{event, Interest, Registry, Token}; |
| |
| <span class="doccomment">/// Adapter for a [`RawFd`] or [`RawSocket`] providing an [`event::Source`] |
| /// implementation. |
| /// |
| /// `IoSource` enables registering any FD or socket wrapper with [`Poll`]. |
| /// |
| /// While only implementations for TCP, UDP, and UDS (Unix only) are provided, |
| /// Mio supports registering any FD or socket that can be registered with the |
| /// underlying OS selector. `IoSource` provides the necessary bridge. |
| /// |
| /// [`RawFd`]: std::os::unix::io::RawFd |
| /// [`RawSocket`]: std::os::windows::io::RawSocket |
| /// |
| /// # Notes |
| /// |
| /// To handle the registrations and events properly **all** I/O operations (such |
| /// as `read`, `write`, etc.) must go through the [`do_io`] method to ensure the |
| /// internal state is updated accordingly. |
| /// |
| /// [`Poll`]: crate::Poll |
| /// [`do_io`]: IoSource::do_io |
| </span><span class="comment">/* |
| /// |
| /// # Examples |
| /// |
| /// Basic usage. |
| /// |
| /// ``` |
| /// # use std::error::Error; |
| /// # fn main() -> Result<(), Box<dyn Error>> { |
| /// use mio::{Interest, Poll, Token}; |
| /// use mio::IoSource; |
| /// |
| /// use std::net; |
| /// |
| /// let poll = Poll::new()?; |
| /// |
| /// // Bind a std TCP listener. |
| /// let listener = net::TcpListener::bind("127.0.0.1:0")?; |
| /// // Wrap it in the `IoSource` type. |
| /// let mut listener = IoSource::new(listener); |
| /// |
| /// // Register the listener. |
| /// poll.registry().register(&mut listener, Token(0), Interest::READABLE)?; |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| */ |
| </span><span class="kw">pub struct </span>IoSource<T> { |
| state: IoSourceState, |
| inner: T, |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>selector_id: SelectorId, |
| } |
| |
| <span class="kw">impl</span><T> IoSource<T> { |
| <span class="doccomment">/// Create a new `IoSource`. |
| </span><span class="kw">pub fn </span>new(io: T) -> IoSource<T> { |
| IoSource { |
| state: IoSourceState::new(), |
| inner: io, |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span>selector_id: SelectorId::new(), |
| } |
| } |
| |
| <span class="doccomment">/// Execute an I/O operations ensuring that the socket receives more events |
| /// if it hits a [`WouldBlock`] error. |
| /// |
| /// # Notes |
| /// |
| /// This method is required to be called for **all** I/O operations to |
| /// ensure the user will receive events once the socket is ready again after |
| /// returning a [`WouldBlock`] error. |
| /// |
| /// [`WouldBlock`]: io::ErrorKind::WouldBlock |
| </span><span class="kw">pub fn </span>do_io<F, R>(<span class="kw-2">&</span><span class="self">self</span>, f: F) -> io::Result<R> |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&</span>T) -> io::Result<R>, |
| { |
| <span class="self">self</span>.state.do_io(f, <span class="kw-2">&</span><span class="self">self</span>.inner) |
| } |
| |
| <span class="doccomment">/// Returns the I/O source, dropping the state. |
| /// |
| /// # Notes |
| /// |
| /// To ensure no more events are to be received for this I/O source first |
| /// [`deregister`] it. |
| /// |
| /// [`deregister`]: Registry::deregister |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="self">self</span>.inner |
| } |
| } |
| |
| <span class="doccomment">/// Be careful when using this method. All I/O operations that may block must go |
| /// through the [`do_io`] method. |
| /// |
| /// [`do_io`]: IoSource::do_io |
| </span><span class="kw">impl</span><T> Deref <span class="kw">for </span>IoSource<T> { |
| <span class="kw">type </span>Target = T; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Target { |
| <span class="kw-2">&</span><span class="self">self</span>.inner |
| } |
| } |
| |
| <span class="doccomment">/// Be careful when using this method. All I/O operations that may block must go |
| /// through the [`do_io`] method. |
| /// |
| /// [`do_io`]: IoSource::do_io |
| </span><span class="kw">impl</span><T> DerefMut <span class="kw">for </span>IoSource<T> { |
| <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Target { |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner |
| } |
| } |
| |
| <span class="attribute">#[cfg(unix)] |
| </span><span class="kw">impl</span><T> event::Source <span class="kw">for </span>IoSource<T> |
| <span class="kw">where |
| </span>T: AsRawFd, |
| { |
| <span class="kw">fn </span>register( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.associate(registry)<span class="question-mark">?</span>; |
| registry |
| .selector() |
| .register(<span class="self">self</span>.inner.as_raw_fd(), token, interests) |
| } |
| |
| <span class="kw">fn </span>reregister( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.check_association(registry)<span class="question-mark">?</span>; |
| registry |
| .selector() |
| .reregister(<span class="self">self</span>.inner.as_raw_fd(), token, interests) |
| } |
| |
| <span class="kw">fn </span>deregister(<span class="kw-2">&mut </span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.remove_association(registry)<span class="question-mark">?</span>; |
| registry.selector().deregister(<span class="self">self</span>.inner.as_raw_fd()) |
| } |
| } |
| |
| <span class="attribute">#[cfg(windows)] |
| </span><span class="kw">impl</span><T> event::Source <span class="kw">for </span>IoSource<T> |
| <span class="kw">where |
| </span>T: AsRawSocket, |
| { |
| <span class="kw">fn </span>register( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.associate(registry)<span class="question-mark">?</span>; |
| <span class="self">self</span>.state |
| .register(registry, token, interests, <span class="self">self</span>.inner.as_raw_socket()) |
| } |
| |
| <span class="kw">fn </span>reregister( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.check_association(registry)<span class="question-mark">?</span>; |
| <span class="self">self</span>.state.reregister(registry, token, interests) |
| } |
| |
| <span class="kw">fn </span>deregister(<span class="kw-2">&mut </span><span class="self">self</span>, _registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.remove_association(_registry)<span class="question-mark">?</span>; |
| <span class="self">self</span>.state.deregister() |
| } |
| } |
| |
| <span class="attribute">#[cfg(target_os = <span class="string">"wasi"</span>)] |
| </span><span class="kw">impl</span><T> event::Source <span class="kw">for </span>IoSource<T> |
| <span class="kw">where |
| </span>T: AsRawFd, |
| { |
| <span class="kw">fn </span>register( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.associate(registry)<span class="question-mark">?</span>; |
| registry |
| .selector() |
| .register(<span class="self">self</span>.inner.as_raw_fd() <span class="kw">as _</span>, token, interests) |
| } |
| |
| <span class="kw">fn </span>reregister( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| registry: <span class="kw-2">&</span>Registry, |
| token: Token, |
| interests: Interest, |
| ) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.check_association(registry)<span class="question-mark">?</span>; |
| registry |
| .selector() |
| .reregister(<span class="self">self</span>.inner.as_raw_fd() <span class="kw">as _</span>, token, interests) |
| } |
| |
| <span class="kw">fn </span>deregister(<span class="kw-2">&mut </span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="self">self</span>.selector_id.remove_association(registry)<span class="question-mark">?</span>; |
| registry.selector().deregister(<span class="self">self</span>.inner.as_raw_fd() <span class="kw">as _</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>IoSource<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <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="self">self</span>.inner.fmt(f) |
| } |
| } |
| |
| <span class="doccomment">/// Used to associate an `IoSource` with a `sys::Selector`. |
| </span><span class="attribute">#[cfg(debug_assertions)] |
| #[derive(Debug)] |
| </span><span class="kw">struct </span>SelectorId { |
| id: AtomicUsize, |
| } |
| |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">impl </span>SelectorId { |
| <span class="doccomment">/// Value of `id` if `SelectorId` is not associated with any |
| /// `sys::Selector`. Valid selector ids start at 1. |
| </span><span class="kw">const </span>UNASSOCIATED: usize = <span class="number">0</span>; |
| |
| <span class="doccomment">/// Create a new `SelectorId`. |
| </span><span class="kw">const fn </span>new() -> SelectorId { |
| SelectorId { |
| id: AtomicUsize::new(<span class="self">Self</span>::UNASSOCIATED), |
| } |
| } |
| |
| <span class="doccomment">/// Associate an I/O source with `registry`, returning an error if its |
| /// already registered. |
| </span><span class="kw">fn </span>associate(<span class="kw-2">&</span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="kw">let </span>registry_id = registry.selector().id(); |
| <span class="kw">let </span>previous_id = <span class="self">self</span>.id.swap(registry_id, Ordering::AcqRel); |
| |
| <span class="kw">if </span>previous_id == <span class="self">Self</span>::UNASSOCIATED { |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::AlreadyExists, |
| <span class="string">"I/O source already registered with a `Registry`"</span>, |
| )) |
| } |
| } |
| |
| <span class="doccomment">/// Check the association of an I/O source with `registry`, returning an |
| /// error if its registered with a different `Registry` or not registered at |
| /// all. |
| </span><span class="kw">fn </span>check_association(<span class="kw-2">&</span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="kw">let </span>registry_id = registry.selector().id(); |
| <span class="kw">let </span>id = <span class="self">self</span>.id.load(Ordering::Acquire); |
| |
| <span class="kw">if </span>id == registry_id { |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else if </span>id == <span class="self">Self</span>::UNASSOCIATED { |
| <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::NotFound, |
| <span class="string">"I/O source not registered with `Registry`"</span>, |
| )) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::AlreadyExists, |
| <span class="string">"I/O source already registered with a different `Registry`"</span>, |
| )) |
| } |
| } |
| |
| <span class="doccomment">/// Remove a previously made association from `registry`, returns an error |
| /// if it was not previously associated with `registry`. |
| </span><span class="kw">fn </span>remove_association(<span class="kw-2">&</span><span class="self">self</span>, registry: <span class="kw-2">&</span>Registry) -> io::Result<()> { |
| <span class="kw">let </span>registry_id = registry.selector().id(); |
| <span class="kw">let </span>previous_id = <span class="self">self</span>.id.swap(<span class="self">Self</span>::UNASSOCIATED, Ordering::AcqRel); |
| |
| <span class="kw">if </span>previous_id == registry_id { |
| <span class="prelude-val">Ok</span>(()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(io::Error::new( |
| io::ErrorKind::NotFound, |
| <span class="string">"I/O source not registered with `Registry`"</span>, |
| )) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(debug_assertions)] |
| </span><span class="kw">impl </span>Clone <span class="kw">for </span>SelectorId { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> SelectorId { |
| SelectorId { |
| id: AtomicUsize::new(<span class="self">self</span>.id.load(Ordering::Acquire)), |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="mio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
