| <!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/io/poll_evented.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>poll_evented.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="kw">use </span><span class="kw">crate</span>::io::interest::Interest; |
| <span class="kw">use </span><span class="kw">crate</span>::runtime::io::Registration; |
| <span class="kw">use </span><span class="kw">crate</span>::runtime::scheduler; |
| |
| <span class="kw">use </span>mio::event::Source; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::ops::Deref; |
| <span class="kw">use </span>std::panic::{RefUnwindSafe, UnwindSafe}; |
| |
| <span class="macro">cfg_io_driver! </span>{ |
| <span class="doccomment">/// Associates an I/O resource that implements the [`std::io::Read`] and/or |
| /// [`std::io::Write`] traits with the reactor that drives it. |
| /// |
| /// `PollEvented` uses [`Registration`] internally to take a type that |
| /// implements [`mio::event::Source`] as well as [`std::io::Read`] and/or |
| /// [`std::io::Write`] and associate it with a reactor that will drive it. |
| /// |
| /// Once the [`mio::event::Source`] type is wrapped by `PollEvented`, it can be |
| /// used from within the future's execution model. As such, the |
| /// `PollEvented` type provides [`AsyncRead`] and [`AsyncWrite`] |
| /// implementations using the underlying I/O resource as well as readiness |
| /// events provided by the reactor. |
| /// |
| /// **Note**: While `PollEvented` is `Sync` (if the underlying I/O type is |
| /// `Sync`), the caller must ensure that there are at most two tasks that |
| /// use a `PollEvented` instance concurrently. One for reading and one for |
| /// writing. While violating this requirement is "safe" from a Rust memory |
| /// model point of view, it will result in unexpected behavior in the form |
| /// of lost notifications and tasks hanging. |
| /// |
| /// ## Readiness events |
| /// |
| /// Besides just providing [`AsyncRead`] and [`AsyncWrite`] implementations, |
| /// this type also supports access to the underlying readiness event stream. |
| /// While similar in function to what [`Registration`] provides, the |
| /// semantics are a bit different. |
| /// |
| /// Two functions are provided to access the readiness events: |
| /// [`poll_read_ready`] and [`poll_write_ready`]. These functions return the |
| /// current readiness state of the `PollEvented` instance. If |
| /// [`poll_read_ready`] indicates read readiness, immediately calling |
| /// [`poll_read_ready`] again will also indicate read readiness. |
| /// |
| /// When the operation is attempted and is unable to succeed due to the I/O |
| /// resource not being ready, the caller must call [`clear_readiness`]. |
| /// This clears the readiness state until a new readiness event is received. |
| /// |
| /// This allows the caller to implement additional functions. For example, |
| /// [`TcpListener`] implements poll_accept by using [`poll_read_ready`] and |
| /// [`clear_readiness`]. |
| /// |
| /// ## Platform-specific events |
| /// |
| /// `PollEvented` 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. |
| /// |
| /// [`AsyncRead`]: crate::io::AsyncRead |
| /// [`AsyncWrite`]: crate::io::AsyncWrite |
| /// [`TcpListener`]: crate::net::TcpListener |
| /// [`clear_readiness`]: Registration::clear_readiness |
| /// [`poll_read_ready`]: Registration::poll_read_ready |
| /// [`poll_write_ready`]: Registration::poll_write_ready |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>PollEvented<E: Source> { |
| io: <span class="prelude-ty">Option</span><E>, |
| registration: Registration, |
| } |
| } |
| |
| <span class="comment">// ===== impl PollEvented ===== |
| |
| </span><span class="kw">impl</span><E: Source> PollEvented<E> { |
| <span class="doccomment">/// Creates a new `PollEvented` associated with the default reactor. |
| /// |
| /// # Panics |
| /// |
| /// This function panics if thread-local runtime is not set. |
| /// |
| /// The runtime is usually set implicitly when this function is called |
| /// from a future driven by a tokio runtime, otherwise runtime can be set |
| /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. |
| </span><span class="attribute">#[track_caller] |
| #[cfg_attr(feature = <span class="string">"signal"</span>, allow(unused))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(io: E) -> io::Result<<span class="self">Self</span>> { |
| PollEvented::new_with_interest(io, Interest::READABLE | Interest::WRITABLE) |
| } |
| |
| <span class="doccomment">/// Creates a new `PollEvented` associated with the default reactor, for |
| /// specific `Interest` state. `new_with_interest` should be used over `new` |
| /// when you need control over the readiness state, such as when a file |
| /// descriptor only allows reads. 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. |
| /// |
| /// # Panics |
| /// |
| /// This function panics if thread-local runtime is not set. |
| /// |
| /// The runtime is usually set implicitly when this function is called from |
| /// a future driven by a tokio runtime, otherwise runtime can be set |
| /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) |
| /// function. |
| </span><span class="attribute">#[track_caller] |
| #[cfg_attr(feature = <span class="string">"signal"</span>, allow(unused))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new_with_interest(io: E, interest: Interest) -> io::Result<<span class="self">Self</span>> { |
| <span class="self">Self</span>::new_with_interest_and_handle(io, interest, scheduler::Handle::current()) |
| } |
| |
| <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( |
| <span class="kw-2">mut </span>io: E, |
| interest: Interest, |
| handle: scheduler::Handle, |
| ) -> io::Result<<span class="self">Self</span>> { |
| <span class="kw">let </span>registration = Registration::new_with_interest_and_handle(<span class="kw-2">&mut </span>io, interest, handle)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">Self </span>{ |
| io: <span class="prelude-val">Some</span>(io), |
| registration, |
| }) |
| } |
| |
| <span class="doccomment">/// Returns a reference to the registration. |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"net"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>registration(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Registration { |
| <span class="kw-2">&</span><span class="self">self</span>.registration |
| } |
| |
| <span class="doccomment">/// Deregisters the inner io from the registration and returns a Result containing the inner io. |
| </span><span class="attribute">#[cfg(any(feature = <span class="string">"net"</span>, feature = <span class="string">"process"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>into_inner(<span class="kw-2">mut </span><span class="self">self</span>) -> io::Result<E> { |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.io.take().unwrap(); <span class="comment">// As io shouldn't ever be None, just unwrap here. |
| </span><span class="self">self</span>.registration.deregister(<span class="kw-2">&mut </span>inner)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(inner) |
| } |
| } |
| |
| <span class="macro">feature! </span>{ |
| <span class="attribute">#![any(feature = <span class="string">"net"</span>, all(unix, feature = <span class="string">"process"</span>))] |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::io::ReadBuf; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="kw">impl</span><E: Source> PollEvented<E> { |
| <span class="comment">// Safety: The caller must ensure that `E` can read into uninitialized memory |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>poll_read<<span class="lifetime">'a</span>>( |
| <span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<io::Result<()>> |
| <span class="kw">where |
| </span><span class="kw-2">&</span><span class="lifetime">'a </span>E: io::Read + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">use </span>std::io::Read; |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>evt = <span class="macro">ready!</span>(<span class="self">self</span>.registration.poll_read_ready(cx))<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>b = <span class="kw-2">&mut *</span>(buf.unfilled_mut() <span class="kw">as </span><span class="kw-2">*mut </span>[std::mem::MaybeUninit<u8>] <span class="kw">as </span><span class="kw-2">*mut </span>[u8]); |
| <span class="kw">let </span>len = b.len(); |
| |
| <span class="kw">match </span><span class="self">self</span>.io.as_ref().unwrap().read(b) { |
| <span class="prelude-val">Ok</span>(n) => { |
| <span class="comment">// if we read a partially full buffer, this is sufficient on unix to show |
| // that the socket buffer has been drained |
| </span><span class="kw">if </span>n > <span class="number">0 </span>&& (!<span class="macro">cfg!</span>(windows) && n < len) { |
| <span class="self">self</span>.registration.clear_readiness(evt); |
| } |
| |
| <span class="comment">// Safety: We trust `TcpStream::read` to have filled up `n` bytes in the |
| // buffer. |
| </span>buf.assume_init(n); |
| buf.advance(n); |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(())); |
| }, |
| <span class="prelude-val">Err</span>(e) <span class="kw">if </span>e.kind() == io::ErrorKind::WouldBlock => { |
| <span class="self">self</span>.registration.clear_readiness(evt); |
| } |
| <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>poll_write<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, buf: <span class="kw-2">&</span>[u8]) -> Poll<io::Result<usize>> |
| <span class="kw">where |
| </span><span class="kw-2">&</span><span class="lifetime">'a </span>E: io::Write + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">use </span>std::io::Write; |
| |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>evt = <span class="macro">ready!</span>(<span class="self">self</span>.registration.poll_write_ready(cx))<span class="question-mark">?</span>; |
| |
| <span class="kw">match </span><span class="self">self</span>.io.as_ref().unwrap().write(buf) { |
| <span class="prelude-val">Ok</span>(n) => { |
| <span class="comment">// if we write only part of our buffer, this is sufficient on unix to show |
| // that the socket buffer is full |
| </span><span class="kw">if </span>n > <span class="number">0 </span>&& (!<span class="macro">cfg!</span>(windows) && n < buf.len()) { |
| <span class="self">self</span>.registration.clear_readiness(evt); |
| } |
| |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(n)); |
| }, |
| <span class="prelude-val">Err</span>(e) <span class="kw">if </span>e.kind() == io::ErrorKind::WouldBlock => { |
| <span class="self">self</span>.registration.clear_readiness(evt); |
| } |
| <span class="prelude-val">Err</span>(e) => <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(e)), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(feature = <span class="string">"net"</span>, feature = <span class="string">"process"</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_write_vectored<<span class="lifetime">'a</span>>( |
| <span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| bufs: <span class="kw-2">&</span>[io::IoSlice<<span class="lifetime">'_</span>>], |
| ) -> Poll<io::Result<usize>> |
| <span class="kw">where |
| </span><span class="kw-2">&</span><span class="lifetime">'a </span>E: io::Write + <span class="lifetime">'a</span>, |
| { |
| <span class="kw">use </span>std::io::Write; |
| <span class="self">self</span>.registration.poll_write_io(cx, || <span class="self">self</span>.io.as_ref().unwrap().write_vectored(bufs)) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><E: Source> UnwindSafe <span class="kw">for </span>PollEvented<E> {} |
| |
| <span class="kw">impl</span><E: Source> RefUnwindSafe <span class="kw">for </span>PollEvented<E> {} |
| |
| <span class="kw">impl</span><E: Source> Deref <span class="kw">for </span>PollEvented<E> { |
| <span class="kw">type </span>Target = E; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>E { |
| <span class="self">self</span>.io.as_ref().unwrap() |
| } |
| } |
| |
| <span class="kw">impl</span><E: Source + fmt::Debug> fmt::Debug <span class="kw">for </span>PollEvented<E> { |
| <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 { |
| f.debug_struct(<span class="string">"PollEvented"</span>).field(<span class="string">"io"</span>, <span class="kw-2">&</span><span class="self">self</span>.io).finish() |
| } |
| } |
| |
| <span class="kw">impl</span><E: Source> Drop <span class="kw">for </span>PollEvented<E> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>io) = <span class="self">self</span>.io.take() { |
| <span class="comment">// Ignore errors |
| </span><span class="kw">let _ </span>= <span class="self">self</span>.registration.deregister(<span class="kw-2">&mut </span>io); |
| } |
| } |
| } |
| </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> |
