| <!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/io/blocking.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>blocking.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::sys; |
| <span class="kw">use </span><span class="kw">crate</span>::io::{AsyncRead, AsyncWrite, ReadBuf}; |
| |
| <span class="kw">use </span>std::cmp; |
| <span class="kw">use </span>std::future::Future; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::io::prelude::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::task::Poll::<span class="kw-2">*</span>; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="kw">use </span><span class="self">self</span>::State::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// `T` should not implement _both_ Read and Write. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Blocking<T> { |
| inner: <span class="prelude-ty">Option</span><T>, |
| state: State<T>, |
| <span class="doccomment">/// `true` if the lower IO layer needs flushing. |
| </span>need_flush: bool, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Buf { |
| buf: Vec<u8>, |
| pos: usize, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>MAX_BUF: usize = <span class="number">16 </span>* <span class="number">1024</span>; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>State<T> { |
| Idle(<span class="prelude-ty">Option</span><Buf>), |
| Busy(sys::Blocking<(io::Result<usize>, Buf, T)>), |
| } |
| |
| <span class="macro">cfg_io_blocking! </span>{ |
| <span class="kw">impl</span><T> Blocking<T> { |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"fs"</span>, allow(dead_code))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(inner: T) -> Blocking<T> { |
| Blocking { |
| inner: <span class="prelude-val">Some</span>(inner), |
| state: State::Idle(<span class="prelude-val">Some</span>(Buf::with_capacity(<span class="number">0</span>))), |
| need_flush: <span class="bool-val">false</span>, |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> AsyncRead <span class="kw">for </span>Blocking<T> |
| <span class="kw">where |
| </span>T: Read + Unpin + Send + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">fn </span>poll_read( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| dst: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<io::Result<()>> { |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span><span class="self">self</span>.state { |
| Idle(<span class="kw-2">ref mut </span>buf_cell) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = buf_cell.take().unwrap(); |
| |
| <span class="kw">if </span>!buf.is_empty() { |
| buf.copy_to(dst); |
| <span class="kw-2">*</span>buf_cell = <span class="prelude-val">Some</span>(buf); |
| <span class="kw">return </span>Ready(<span class="prelude-val">Ok</span>(())); |
| } |
| |
| buf.ensure_capacity_for(dst); |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.take().unwrap(); |
| |
| <span class="self">self</span>.state = Busy(sys::run(<span class="kw">move </span>|| { |
| <span class="kw">let </span>res = buf.read_from(<span class="kw-2">&mut </span>inner); |
| (res, buf, inner) |
| })); |
| } |
| Busy(<span class="kw-2">ref mut </span>rx) => { |
| <span class="kw">let </span>(res, <span class="kw-2">mut </span>buf, inner) = <span class="macro">ready!</span>(Pin::new(rx).poll(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.inner = <span class="prelude-val">Some</span>(inner); |
| |
| <span class="kw">match </span>res { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) => { |
| buf.copy_to(dst); |
| <span class="self">self</span>.state = Idle(<span class="prelude-val">Some</span>(buf)); |
| <span class="kw">return </span>Ready(<span class="prelude-val">Ok</span>(())); |
| } |
| <span class="prelude-val">Err</span>(e) => { |
| <span class="macro">assert!</span>(buf.is_empty()); |
| |
| <span class="self">self</span>.state = Idle(<span class="prelude-val">Some</span>(buf)); |
| <span class="kw">return </span>Ready(<span class="prelude-val">Err</span>(e)); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> AsyncWrite <span class="kw">for </span>Blocking<T> |
| <span class="kw">where |
| </span>T: Write + Unpin + Send + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">fn </span>poll_write( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| src: <span class="kw-2">&</span>[u8], |
| ) -> Poll<io::Result<usize>> { |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span><span class="self">self</span>.state { |
| Idle(<span class="kw-2">ref mut </span>buf_cell) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = buf_cell.take().unwrap(); |
| |
| <span class="macro">assert!</span>(buf.is_empty()); |
| |
| <span class="kw">let </span>n = buf.copy_from(src); |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.take().unwrap(); |
| |
| <span class="self">self</span>.state = Busy(sys::run(<span class="kw">move </span>|| { |
| <span class="kw">let </span>n = buf.len(); |
| <span class="kw">let </span>res = buf.write_to(<span class="kw-2">&mut </span>inner).map(|<span class="kw">_</span>| n); |
| |
| (res, buf, inner) |
| })); |
| <span class="self">self</span>.need_flush = <span class="bool-val">true</span>; |
| |
| <span class="kw">return </span>Ready(<span class="prelude-val">Ok</span>(n)); |
| } |
| Busy(<span class="kw-2">ref mut </span>rx) => { |
| <span class="kw">let </span>(res, buf, inner) = <span class="macro">ready!</span>(Pin::new(rx).poll(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.state = Idle(<span class="prelude-val">Some</span>(buf)); |
| <span class="self">self</span>.inner = <span class="prelude-val">Some</span>(inner); |
| |
| <span class="comment">// If error, return |
| </span>res<span class="question-mark">?</span>; |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), io::Error>> { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>need_flush = <span class="self">self</span>.need_flush; |
| <span class="kw">match </span><span class="self">self</span>.state { |
| <span class="comment">// The buffer is not used here |
| </span>Idle(<span class="kw-2">ref mut </span>buf_cell) => { |
| <span class="kw">if </span>need_flush { |
| <span class="kw">let </span>buf = buf_cell.take().unwrap(); |
| <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.inner.take().unwrap(); |
| |
| <span class="self">self</span>.state = Busy(sys::run(<span class="kw">move </span>|| { |
| <span class="kw">let </span>res = inner.flush().map(|<span class="kw">_</span>| <span class="number">0</span>); |
| (res, buf, inner) |
| })); |
| |
| <span class="self">self</span>.need_flush = <span class="bool-val">false</span>; |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>Ready(<span class="prelude-val">Ok</span>(())); |
| } |
| } |
| Busy(<span class="kw-2">ref mut </span>rx) => { |
| <span class="kw">let </span>(res, buf, inner) = <span class="macro">ready!</span>(Pin::new(rx).poll(cx))<span class="question-mark">?</span>; |
| <span class="self">self</span>.state = Idle(<span class="prelude-val">Some</span>(buf)); |
| <span class="self">self</span>.inner = <span class="prelude-val">Some</span>(inner); |
| |
| <span class="comment">// If error, return |
| </span>res<span class="question-mark">?</span>; |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>poll_shutdown(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, _cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), io::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| } |
| |
| <span class="doccomment">/// Repeats operations that are interrupted. |
| </span><span class="macro">macro_rules! </span>uninterruptibly { |
| (<span class="macro-nonterminal">$e</span>:expr) => {{ |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span><span class="macro-nonterminal">$e </span>{ |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref </span>e) <span class="kw">if </span>e.kind() == io::ErrorKind::Interrupted => {} |
| res => <span class="kw">break </span>res, |
| } |
| } |
| }}; |
| } |
| |
| <span class="kw">impl </span>Buf { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>with_capacity(n: usize) -> Buf { |
| Buf { |
| buf: Vec::with_capacity(n), |
| pos: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len() == <span class="number">0 |
| </span>} |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.buf.len() - <span class="self">self</span>.pos |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>copy_to(<span class="kw-2">&mut </span><span class="self">self</span>, dst: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>) -> usize { |
| <span class="kw">let </span>n = cmp::min(<span class="self">self</span>.len(), dst.remaining()); |
| dst.put_slice(<span class="kw-2">&</span><span class="self">self</span>.bytes()[..n]); |
| <span class="self">self</span>.pos += n; |
| |
| <span class="kw">if </span><span class="self">self</span>.pos == <span class="self">self</span>.buf.len() { |
| <span class="self">self</span>.buf.truncate(<span class="number">0</span>); |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| } |
| |
| n |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>copy_from(<span class="kw-2">&mut </span><span class="self">self</span>, src: <span class="kw-2">&</span>[u8]) -> usize { |
| <span class="macro">assert!</span>(<span class="self">self</span>.is_empty()); |
| |
| <span class="kw">let </span>n = cmp::min(src.len(), MAX_BUF); |
| |
| <span class="self">self</span>.buf.extend_from_slice(<span class="kw-2">&</span>src[..n]); |
| n |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>bytes(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.buf[<span class="self">self</span>.pos..] |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>ensure_capacity_for(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: <span class="kw-2">&</span>ReadBuf<<span class="lifetime">'_</span>>) { |
| <span class="macro">assert!</span>(<span class="self">self</span>.is_empty()); |
| |
| <span class="kw">let </span>len = cmp::min(bytes.remaining(), MAX_BUF); |
| |
| <span class="kw">if </span><span class="self">self</span>.buf.len() < len { |
| <span class="self">self</span>.buf.reserve(len - <span class="self">self</span>.buf.len()); |
| } |
| |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.buf.set_len(len); |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>read_from<T: Read>(<span class="kw-2">&mut </span><span class="self">self</span>, rd: <span class="kw-2">&mut </span>T) -> io::Result<usize> { |
| <span class="kw">let </span>res = <span class="macro">uninterruptibly!</span>(rd.read(<span class="kw-2">&mut </span><span class="self">self</span>.buf)); |
| |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(n) = res { |
| <span class="self">self</span>.buf.truncate(n); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.buf.clear(); |
| } |
| |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.pos, <span class="number">0</span>); |
| |
| res |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>write_to<T: Write>(<span class="kw-2">&mut </span><span class="self">self</span>, wr: <span class="kw-2">&mut </span>T) -> io::Result<()> { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.pos, <span class="number">0</span>); |
| |
| <span class="comment">// `write_all` already ignores interrupts |
| </span><span class="kw">let </span>res = wr.write_all(<span class="kw-2">&</span><span class="self">self</span>.buf); |
| <span class="self">self</span>.buf.clear(); |
| res |
| } |
| } |
| |
| <span class="macro">cfg_fs! </span>{ |
| <span class="kw">impl </span>Buf { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>discard_read(<span class="kw-2">&mut </span><span class="self">self</span>) -> i64 { |
| <span class="kw">let </span>ret = -(<span class="self">self</span>.bytes().len() <span class="kw">as </span>i64); |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| <span class="self">self</span>.buf.truncate(<span class="number">0</span>); |
| ret |
| } |
| } |
| } |
| </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> |