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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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