| <!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/arc-swap-1.6.0/src/strategy/hybrid.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>hybrid.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="../../../arc_swap/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="../../../arc_swap/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="doccomment">//! A hybrid strategy. |
| //! |
| //! This is based on debts ‒ an Arc may owe a reference, but it is marked in the debt. It is either |
| //! put back (by stopping using it), or if the pointer is replaced, the writer bumps the reference |
| //! count and removes the debt. |
| //! |
| //! The strategy uses two different slots for the debts. The first ones are faster, but fallible. |
| //! If they fail (either because there's interference from a writer at the same time, or because |
| //! they are full), the secondary one that is slower, but always succeeds, is used. In the latter |
| //! case, the reference is bumped and this secondary debt slot is released, so it is available for |
| //! further loads. |
| //! |
| //! See the [crate::debt] module for the actual slot manipulation. Here we just wrap them into the |
| //! strategy. |
| |
| </span><span class="kw">use </span>std::borrow::Borrow; |
| <span class="kw">use </span>std::mem::{<span class="self">self</span>, ManuallyDrop}; |
| <span class="kw">use </span>std::ops::Deref; |
| <span class="kw">use </span>std::ptr; |
| <span class="kw">use </span>std::sync::atomic::AtomicPtr; |
| <span class="kw">use </span>std::sync::atomic::Ordering::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span><span class="kw">super</span>::sealed::{CaS, InnerStrategy, Protected}; |
| <span class="kw">use </span><span class="kw">crate</span>::debt::{Debt, LocalNode}; |
| <span class="kw">use </span><span class="kw">crate</span>::ref_cnt::RefCnt; |
| |
| <span class="kw">pub struct </span>HybridProtection<T: RefCnt> { |
| debt: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>Debt>, |
| ptr: ManuallyDrop<T>, |
| } |
| |
| <span class="kw">impl</span><T: RefCnt> HybridProtection<T> { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>new(ptr: <span class="kw-2">*const </span>T::Base, debt: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'static </span>Debt>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| debt, |
| ptr: ManuallyDrop::new(T::from_ptr(ptr)), |
| } |
| } |
| |
| <span class="doccomment">/// Try getting a dept into a fast slot. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>attempt(node: <span class="kw-2">&</span>LocalNode, storage: <span class="kw-2">&</span>AtomicPtr<T::Base>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> { |
| <span class="comment">// Relaxed is good enough here, see the Acquire below |
| </span><span class="kw">let </span>ptr = storage.load(Relaxed); |
| <span class="comment">// Try to get a debt slot. If not possible, fail. |
| </span><span class="kw">let </span>debt = node.new_fast(ptr <span class="kw">as </span>usize)<span class="question-mark">?</span>; |
| |
| <span class="comment">// Acquire to get the data. |
| // |
| // SeqCst to make sure the storage vs. the debt are well ordered. |
| </span><span class="kw">let </span>confirm = storage.load(SeqCst); |
| <span class="kw">if </span>ptr == confirm { |
| <span class="comment">// Successfully got a debt |
| </span><span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ <span class="self">Self</span>::new(ptr, <span class="prelude-val">Some</span>(debt)) }) |
| } <span class="kw">else if </span>debt.pay::<T>(ptr) { |
| <span class="comment">// It changed in the meantime, we return the debt (that is on the outdated pointer, |
| // possibly destroyed) and fail. |
| </span><span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="comment">// It changed in the meantime, but the debt for the previous pointer was already paid |
| // for by someone else, so we are fine using it. |
| </span><span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ <span class="self">Self</span>::new(ptr, <span class="prelude-val">None</span>) }) |
| } |
| } |
| |
| <span class="doccomment">/// Get a debt slot using the slower but always successful mechanism. |
| </span><span class="kw">fn </span>fallback(node: <span class="kw-2">&</span>LocalNode, storage: <span class="kw-2">&</span>AtomicPtr<T::Base>) -> <span class="self">Self </span>{ |
| <span class="comment">// First, we claim a debt slot and store the address of the atomic pointer there, so the |
| // writer can optionally help us out with loading and protecting something. |
| </span><span class="kw">let </span>gen = node.new_helping(storage <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span>usize); |
| <span class="comment">// We already synchronized the start of the sequence by SeqCst in the new_helping vs swap on |
| // the pointer. We just need to make sure to bring the pointee in (this can be newer than |
| // what we got in the Debt) |
| </span><span class="kw">let </span>candidate = storage.load(Acquire); |
| |
| <span class="comment">// Try to replace the debt with our candidate. If it works, we get the debt slot to use. If |
| // not, we get a replacement value, already protected and a debt to take care of. |
| </span><span class="kw">match </span>node.confirm_helping(gen, candidate <span class="kw">as </span>usize) { |
| <span class="prelude-val">Ok</span>(debt) => { |
| <span class="comment">// The fast path -> we got the debt confirmed alright. |
| </span><span class="self">Self</span>::from_inner(<span class="kw">unsafe </span>{ <span class="self">Self</span>::new(candidate, <span class="prelude-val">Some</span>(debt)).into_inner() }) |
| } |
| <span class="prelude-val">Err</span>((unused_debt, replacement)) => { |
| <span class="comment">// The debt is on the candidate we provided and it is unused, we so we just pay it |
| // back right away. |
| </span><span class="kw">if </span>!unused_debt.pay::<T>(candidate) { |
| <span class="kw">unsafe </span>{ T::dec(candidate) }; |
| } |
| <span class="comment">// We got a (possibly) different pointer out. But that one is already protected and |
| // the slot is paid back. |
| </span><span class="kw">unsafe </span>{ <span class="self">Self</span>::new(replacement <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_</span>, <span class="prelude-val">None</span>) } |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>as_ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*const </span>T::Base { |
| T::as_ptr(<span class="self">self</span>.ptr.deref()) |
| } |
| } |
| |
| <span class="kw">impl</span><T: RefCnt> Drop <span class="kw">for </span>HybridProtection<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">match </span><span class="self">self</span>.debt.take() { |
| <span class="comment">// We have our own copy of Arc, so we don't need a protection. Do nothing (but release |
| // the Arc below). |
| </span><span class="prelude-val">None </span>=> (), |
| <span class="comment">// If we owed something, just return the debt. We don't have a pointer owned, so |
| // nothing to release. |
| </span><span class="prelude-val">Some</span>(debt) => { |
| <span class="kw">let </span>ptr = T::as_ptr(<span class="kw-2">&</span><span class="self">self</span>.ptr); |
| <span class="kw">if </span>debt.pay::<T>(ptr) { |
| <span class="kw">return</span>; |
| } |
| <span class="comment">// But if the debt was already paid for us, we need to release the pointer, as we |
| // were effectively already in the Unprotected mode. |
| </span>} |
| } |
| <span class="comment">// Equivalent to T::dec(ptr) |
| </span><span class="kw">unsafe </span>{ ManuallyDrop::drop(<span class="kw-2">&mut </span><span class="self">self</span>.ptr) }; |
| } |
| } |
| |
| <span class="kw">impl</span><T: RefCnt> Protected<T> <span class="kw">for </span>HybridProtection<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from_inner(ptr: T) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| debt: <span class="prelude-val">None</span>, |
| ptr: ManuallyDrop::new(ptr), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_inner(<span class="kw-2">mut </span><span class="self">self</span>) -> T { |
| <span class="comment">// Drop any debt and release any lock held by the given guard and return a |
| // full-featured value that even can outlive the ArcSwap it originated from. |
| </span><span class="kw">match </span><span class="self">self</span>.debt.take() { |
| <span class="prelude-val">None </span>=> (), <span class="comment">// We have a fully loaded ref-counted pointer. |
| </span><span class="prelude-val">Some</span>(debt) => { |
| <span class="kw">let </span>ptr = T::inc(<span class="kw-2">&</span><span class="self">self</span>.ptr); |
| <span class="kw">if </span>!debt.pay::<T>(ptr) { |
| <span class="kw">unsafe </span>{ T::dec(ptr) }; |
| } |
| } |
| } |
| |
| <span class="comment">// The ptr::read & forget is something like a cheating move. We can't move it out, because |
| // we have a destructor and Rust doesn't allow us to do that. |
| </span><span class="kw">let </span>inner = <span class="kw">unsafe </span>{ ptr::read(<span class="self">self</span>.ptr.deref()) }; |
| mem::forget(<span class="self">self</span>); |
| inner |
| } |
| } |
| |
| <span class="kw">impl</span><T: RefCnt> Borrow<T> <span class="kw">for </span>HybridProtection<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>borrow(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw-2">&</span><span class="self">self</span>.ptr |
| } |
| } |
| |
| <span class="kw">pub trait </span>Config { |
| <span class="comment">// Mostly for testing, way to disable the fast slo |
| </span><span class="kw">const </span>USE_FAST: bool; |
| } |
| |
| <span class="attribute">#[derive(Clone, Default)] |
| </span><span class="kw">pub struct </span>DefaultConfig; |
| |
| <span class="kw">impl </span>Config <span class="kw">for </span>DefaultConfig { |
| <span class="kw">const </span>USE_FAST: bool = <span class="bool-val">true</span>; |
| } |
| |
| <span class="attribute">#[derive(Clone, Default)] |
| </span><span class="kw">pub struct </span>HybridStrategy<Cfg> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) _config: Cfg, |
| } |
| |
| <span class="kw">impl</span><T, Cfg> InnerStrategy<T> <span class="kw">for </span>HybridStrategy<Cfg> |
| <span class="kw">where |
| </span>T: RefCnt, |
| Cfg: Config, |
| { |
| <span class="kw">type </span>Protected = HybridProtection<T>; |
| <span class="kw">unsafe fn </span>load(<span class="kw-2">&</span><span class="self">self</span>, storage: <span class="kw-2">&</span>AtomicPtr<T::Base>) -> <span class="self">Self</span>::Protected { |
| LocalNode::with(|node| { |
| <span class="kw">let </span>fast = <span class="kw">if </span>Cfg::USE_FAST { |
| HybridProtection::attempt(node, storage) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| fast.unwrap_or_else(|| HybridProtection::fallback(node, storage)) |
| }) |
| } |
| <span class="kw">unsafe fn </span>wait_for_readers(<span class="kw-2">&</span><span class="self">self</span>, old: <span class="kw-2">*const </span>T::Base, storage: <span class="kw-2">&</span>AtomicPtr<T::Base>) { |
| <span class="comment">// The pay_all may need to provide fresh replacement values if someone else is loading from |
| // this particular storage. We do so by the exact same way, by `load` ‒ it's OK, a writer |
| // does not hold a slot and the reader doesn't recurse back into writer, so we won't run |
| // out of slots. |
| </span><span class="kw">let </span>replacement = || <span class="self">self</span>.load(storage).into_inner(); |
| Debt::pay_all::<T, <span class="kw">_</span>>(old, storage <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span>usize, replacement); |
| } |
| } |
| |
| <span class="kw">impl</span><T: RefCnt, Cfg: Config> CaS<T> <span class="kw">for </span>HybridStrategy<Cfg> { |
| <span class="kw">unsafe fn </span>compare_and_swap<C: <span class="kw">crate</span>::as_raw::AsRaw<T::Base>>( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| storage: <span class="kw-2">&</span>AtomicPtr<T::Base>, |
| current: C, |
| new: T, |
| ) -> <span class="self">Self</span>::Protected { |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>old = <<span class="self">Self </span><span class="kw">as </span>InnerStrategy<T>>::load(<span class="self">self</span>, storage); |
| <span class="comment">// Observation of their inequality is enough to make a verdict |
| </span><span class="kw">if </span>old.as_ptr() != current.as_raw() { |
| <span class="kw">return </span>old; |
| } |
| <span class="comment">// If they are still equal, put the new one in. |
| </span><span class="kw">let </span>new_raw = T::as_ptr(<span class="kw-2">&</span>new); |
| <span class="kw">if </span>storage |
| .compare_exchange_weak(current.as_raw(), new_raw, SeqCst, Relaxed) |
| .is_ok() |
| { |
| <span class="comment">// We successfully put the new value in. The ref count went in there too. |
| </span>T::into_ptr(new); |
| <<span class="self">Self </span><span class="kw">as </span>InnerStrategy<T>>::wait_for_readers(<span class="self">self</span>, old.as_ptr(), storage); |
| <span class="comment">// We just got one ref count out of the storage and we have one in old. We don't |
| // need two. |
| </span>T::dec(old.as_ptr()); |
| <span class="kw">return </span>old; |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="arc_swap" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
