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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/mio-0.7.11/src/io_source.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>io_source.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">AsRawFd</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">windows</span>::<span class="ident">io</span>::<span class="ident">AsRawSocket</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">fmt</span>, <span class="ident">io</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">unix</span>, <span class="ident">debug_assertions</span>))]</span>
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">poll</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sys</span>::<span class="ident">IoSourceState</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">event</span>, <span class="ident">Interest</span>, <span class="ident">Registry</span>, <span class="ident">Token</span>};
<span class="doccomment">/// Adapter for a [`RawFd`] or [`RawSocket`] providing an [`event::Source`]</span>
<span class="doccomment">/// implementation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `IoSource` enables registering any FD or socket wrapper with [`Poll`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// While only implementations for TCP, UDP, and UDS (Unix only) are provided,</span>
<span class="doccomment">/// Mio supports registering any FD or socket that can be registered with the</span>
<span class="doccomment">/// underlying OS selector. `IoSource` provides the necessary bridge.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`RawFd`]: std::os::unix::io::RawFd</span>
<span class="doccomment">/// [`RawSocket`]: std::os::windows::io::RawSocket</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To handle the registrations and events properly **all** I/O operations (such</span>
<span class="doccomment">/// as `read`, `write`, etc.) must go through the [`do_io`] method to ensure the</span>
<span class="doccomment">/// internal state is updated accordingly.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Poll`]: crate::Poll</span>
<span class="doccomment">/// [`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</span> <span class="kw">struct</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">state</span>: <span class="ident">IoSourceState</span>,
<span class="ident">inner</span>: <span class="ident">T</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="ident">selector_id</span>: <span class="ident">SelectorId</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Create a new `IoSource`.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">io</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">IoSource</span> {
<span class="ident">state</span>: <span class="ident">IoSourceState</span>::<span class="ident">new</span>(),
<span class="ident">inner</span>: <span class="ident">io</span>,
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="ident">selector_id</span>: <span class="ident">SelectorId</span>::<span class="ident">new</span>(),
}
}
<span class="doccomment">/// Execute an I/O operations ensuring that the socket receives more events</span>
<span class="doccomment">/// if it hits a [`WouldBlock`] error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method is required to be called for **all** I/O operations to</span>
<span class="doccomment">/// ensure the user will receive events once the socket is ready again after</span>
<span class="doccomment">/// returning a [`WouldBlock`] error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`WouldBlock`]: io::ErrorKind::WouldBlock</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">do_io</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>,
{
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">do_io</span>(<span class="ident">f</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>)
}
<span class="doccomment">/// Returns the I/O source, dropping the state.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Notes</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To ensure no more events are to be received for this I/O source first</span>
<span class="doccomment">/// [`deregister`] it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`deregister`]: Registry::deregister</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">inner</span>
}
}
<span class="doccomment">/// Be careful when using this method. All I/O operations that may block must go</span>
<span class="doccomment">/// through the [`do_io`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`do_io`]: IoSource::do_io</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">deref</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="self">Self</span>::<span class="ident">Target</span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>
}
}
<span class="doccomment">/// Be careful when using this method. All I/O operations that may block must go</span>
<span class="doccomment">/// through the [`do_io`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`do_io`]: IoSource::do_io</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Target</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span>
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">event</span>::<span class="ident">Source</span> <span class="kw">for</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">AsRawFd</span>,
{
<span class="kw">fn</span> <span class="ident">register</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>,
<span class="ident">token</span>: <span class="ident">Token</span>,
<span class="ident">interests</span>: <span class="ident">Interest</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">associate</span>(<span class="ident">registry</span>)<span class="question-mark">?</span>;
<span class="ident">poll</span>::<span class="ident">selector</span>(<span class="ident">registry</span>).<span class="ident">register</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">token</span>, <span class="ident">interests</span>)
}
<span class="kw">fn</span> <span class="ident">reregister</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>,
<span class="ident">token</span>: <span class="ident">Token</span>,
<span class="ident">interests</span>: <span class="ident">Interest</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">check_association</span>(<span class="ident">registry</span>)<span class="question-mark">?</span>;
<span class="ident">poll</span>::<span class="ident">selector</span>(<span class="ident">registry</span>).<span class="ident">reregister</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>(), <span class="ident">token</span>, <span class="ident">interests</span>)
}
<span class="kw">fn</span> <span class="ident">deregister</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">remove_association</span>(<span class="ident">registry</span>)<span class="question-mark">?</span>;
<span class="ident">poll</span>::<span class="ident">selector</span>(<span class="ident">registry</span>).<span class="ident">deregister</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_fd</span>())
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">event</span>::<span class="ident">Source</span> <span class="kw">for</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">AsRawSocket</span>,
{
<span class="kw">fn</span> <span class="ident">register</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>,
<span class="ident">token</span>: <span class="ident">Token</span>,
<span class="ident">interests</span>: <span class="ident">Interest</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">associate</span>(<span class="ident">registry</span>)<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">state</span>
.<span class="ident">register</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>, <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_raw_socket</span>())
}
<span class="kw">fn</span> <span class="ident">reregister</span>(
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>,
<span class="ident">token</span>: <span class="ident">Token</span>,
<span class="ident">interests</span>: <span class="ident">Interest</span>,
) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">check_association</span>(<span class="ident">registry</span>)<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">reregister</span>(<span class="ident">registry</span>, <span class="ident">token</span>, <span class="ident">interests</span>)
}
<span class="kw">fn</span> <span class="ident">deregister</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="self">self</span>.<span class="ident">selector_id</span>.<span class="ident">remove_association</span>(<span class="ident">_registry</span>)<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">state</span>.<span class="ident">deregister</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IoSource</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</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</span>::<span class="ident">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</span>::<span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="doccomment">/// Used to associate an `IoSource` with a `sys::Selector`.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">SelectorId</span> {
<span class="ident">id</span>: <span class="ident">AtomicUsize</span>,
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="kw">impl</span> <span class="ident">SelectorId</span> {
<span class="doccomment">/// Value of `id` if `SelectorId` is not associated with any</span>
<span class="doccomment">/// `sys::Selector`. Valid selector ids start at 1.</span>
<span class="kw">const</span> <span class="ident">UNASSOCIATED</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="doccomment">/// Create a new `SelectorId`.</span>
<span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">SelectorId</span> {
<span class="ident">SelectorId</span> {
<span class="ident">id</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="self">Self</span>::<span class="ident">UNASSOCIATED</span>),
}
}
<span class="doccomment">/// Associate an I/O source with `registry`, returning an error if its</span>
<span class="doccomment">/// already registered.</span>
<span class="kw">fn</span> <span class="ident">associate</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="ident">registry_id</span> <span class="op">=</span> <span class="ident">poll</span>::<span class="ident">selector</span>(<span class="kw-2">&</span><span class="ident">registry</span>).<span class="ident">id</span>();
<span class="kw">let</span> <span class="ident">previous_id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">swap</span>(<span class="ident">registry_id</span>, <span class="ident">Ordering</span>::<span class="ident">AcqRel</span>);
<span class="kw">if</span> <span class="ident">previous_id</span> <span class="op">=</span><span class="op">=</span> <span class="self">Self</span>::<span class="ident">UNASSOCIATED</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">AlreadyExists</span>,
<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</span>
<span class="doccomment">/// error if its registered with a different `Registry` or not registered at</span>
<span class="doccomment">/// all.</span>
<span class="kw">fn</span> <span class="ident">check_association</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="ident">registry_id</span> <span class="op">=</span> <span class="ident">poll</span>::<span class="ident">selector</span>(<span class="kw-2">&</span><span class="ident">registry</span>).<span class="ident">id</span>();
<span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Acquire</span>);
<span class="kw">if</span> <span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">registry_id</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">id</span> <span class="op">=</span><span class="op">=</span> <span class="self">Self</span>::<span class="ident">UNASSOCIATED</span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">NotFound</span>,
<span class="string">"I/O source not registered with `Registry`"</span>,
))
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">AlreadyExists</span>,
<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</span>
<span class="doccomment">/// if it was not previously associated with `registry`.</span>
<span class="kw">fn</span> <span class="ident">remove_association</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">registry</span>: <span class="kw-2">&</span><span class="ident">Registry</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="ident">registry_id</span> <span class="op">=</span> <span class="ident">poll</span>::<span class="ident">selector</span>(<span class="kw-2">&</span><span class="ident">registry</span>).<span class="ident">id</span>();
<span class="kw">let</span> <span class="ident">previous_id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>.<span class="ident">swap</span>(<span class="self">Self</span>::<span class="ident">UNASSOCIATED</span>, <span class="ident">Ordering</span>::<span class="ident">AcqRel</span>);
<span class="kw">if</span> <span class="ident">previous_id</span> <span class="op">=</span><span class="op">=</span> <span class="ident">registry_id</span> {
<span class="prelude-val">Ok</span>(())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(
<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">NotFound</span>,
<span class="string">"I/O source not registered with `Registry`"</span>,
))
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">SelectorId</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">SelectorId</span> {
<span class="ident">SelectorId</span> {
<span class="ident">id</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Acquire</span>)),
}
}
}
</pre></div>
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