| <!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/try-lock-0.2.4/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.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="../../try_lock/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="../../try_lock/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="attribute">#![doc(html_root_url = <span class="string">"https://docs.rs/try-lock/0.2.3"</span>)] |
| #![deny(missing_docs)] |
| #![deny(missing_debug_implementations)] |
| #![deny(warnings)] |
| #![cfg_attr(not(test), no_std)] |
| |
| </span><span class="doccomment">//! A light-weight lock guarded by an atomic boolean. |
| //! |
| //! Most efficient when contention is low, acquiring the lock is a single |
| //! atomic swap, and releasing it just 1 more atomic swap. |
| //! |
| //! # Example |
| //! |
| //! ``` |
| //! use std::sync::Arc; |
| //! use try_lock::TryLock; |
| //! |
| //! // a thing we want to share |
| //! struct Widget { |
| //! name: String, |
| //! } |
| //! |
| //! // lock it up! |
| //! let widget1 = Arc::new(TryLock::new(Widget { |
| //! name: "Spanner".into(), |
| //! })); |
| //! |
| //! let widget2 = widget1.clone(); |
| //! |
| //! |
| //! // mutate the widget |
| //! let mut locked = widget1.try_lock().expect("example isn't locked yet"); |
| //! locked.name.push_str(" Bundle"); |
| //! |
| //! // hands off, buddy |
| //! let not_locked = widget2.try_lock(); |
| //! assert!(not_locked.is_none(), "widget1 has the lock"); |
| //! |
| //! // ok, you can have it |
| //! drop(locked); |
| //! |
| //! let locked2 = widget2.try_lock().expect("widget1 lock is released"); |
| //! |
| //! assert_eq!(locked2.name, "Spanner Bundle"); |
| //! ``` |
| |
| </span><span class="attribute">#[cfg(test)] |
| </span><span class="kw">extern crate </span>core; |
| |
| <span class="kw">use </span>core::cell::UnsafeCell; |
| <span class="kw">use </span>core::fmt; |
| <span class="kw">use </span>core::ops::{Deref, DerefMut}; |
| <span class="kw">use </span>core::sync::atomic::{AtomicBool, Ordering}; |
| <span class="kw">use </span>core::marker::PhantomData; |
| |
| <span class="doccomment">/// A light-weight lock guarded by an atomic boolean. |
| /// |
| /// Most efficient when contention is low, acquiring the lock is a single |
| /// atomic swap, and releasing it just 1 more atomic swap. |
| /// |
| /// It is only possible to try to acquire the lock, it is not possible to |
| /// wait for the lock to become ready, like with a `Mutex`. |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub struct </span>TryLock<T> { |
| is_locked: AtomicBool, |
| value: UnsafeCell<T>, |
| } |
| |
| <span class="kw">impl</span><T> TryLock<T> { |
| <span class="doccomment">/// Create a `TryLock` around the value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new(val: T) -> TryLock<T> { |
| TryLock { |
| is_locked: AtomicBool::new(<span class="bool-val">false</span>), |
| value: UnsafeCell::new(val), |
| } |
| } |
| |
| <span class="doccomment">/// Try to acquire the lock of this value. |
| /// |
| /// If the lock is already acquired by someone else, this returns |
| /// `None`. You can try to acquire again whenever you want, perhaps |
| /// by spinning a few times, or by using some other means of |
| /// notification. |
| /// |
| /// # Note |
| /// |
| /// The default memory ordering is to use `Acquire` to lock, and `Release` |
| /// to unlock. If different ordering is required, use |
| /// [`try_lock_explicit`](TryLock::try_lock_explicit) or |
| /// [`try_lock_explicit_unchecked`](TryLock::try_lock_explicit_unchecked). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>try_lock(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Locked<T>> { |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.try_lock_explicit_unchecked(Ordering::Acquire, Ordering::Release) |
| } |
| } |
| |
| <span class="doccomment">/// Try to acquire the lock of this value using the lock and unlock orderings. |
| /// |
| /// If the lock is already acquired by someone else, this returns |
| /// `None`. You can try to acquire again whenever you want, perhaps |
| /// by spinning a few times, or by using some other means of |
| /// notification. |
| </span><span class="attribute">#[inline] |
| #[deprecated( |
| since = <span class="string">"0.2.3"</span>, |
| note = <span class="string">"This method is actually unsafe because it unsafely allows \ |
| the use of weaker memory ordering. Please use try_lock_explicit instead" |
| </span>)] |
| </span><span class="kw">pub fn </span>try_lock_order(<span class="kw-2">&</span><span class="self">self</span>, lock_order: Ordering, unlock_order: Ordering) -> <span class="prelude-ty">Option</span><Locked<T>> { |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.try_lock_explicit_unchecked(lock_order, unlock_order) |
| } |
| } |
| |
| <span class="doccomment">/// Try to acquire the lock of this value using the specified lock and |
| /// unlock orderings. |
| /// |
| /// If the lock is already acquired by someone else, this returns |
| /// `None`. You can try to acquire again whenever you want, perhaps |
| /// by spinning a few times, or by using some other means of |
| /// notification. |
| /// |
| /// # Panic |
| /// |
| /// This method panics if `lock_order` is not any of `Acquire`, `AcqRel`, |
| /// and `SeqCst`, or `unlock_order` is not any of `Release` and `SeqCst`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>try_lock_explicit(<span class="kw-2">&</span><span class="self">self</span>, lock_order: Ordering, unlock_order: Ordering) -> <span class="prelude-ty">Option</span><Locked<T>> { |
| <span class="kw">match </span>lock_order { |
| Ordering::Acquire | |
| Ordering::AcqRel | |
| Ordering::SeqCst => {} |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"lock ordering must be `Acquire`, `AcqRel`, or `SeqCst`"</span>), |
| } |
| |
| <span class="kw">match </span>unlock_order { |
| Ordering::Release | |
| Ordering::SeqCst => {} |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"unlock ordering must be `Release` or `SeqCst`"</span>), |
| } |
| |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.try_lock_explicit_unchecked(lock_order, unlock_order) |
| } |
| } |
| |
| <span class="doccomment">/// Try to acquire the lock of this value using the specified lock and |
| /// unlock orderings without checking that the specified orderings are |
| /// strong enough to be safe. |
| /// |
| /// If the lock is already acquired by someone else, this returns |
| /// `None`. You can try to acquire again whenever you want, perhaps |
| /// by spinning a few times, or by using some other means of |
| /// notification. |
| /// |
| /// # Safety |
| /// |
| /// Unlike [`try_lock_explicit`], this method is unsafe because it does not |
| /// check that the given memory orderings are strong enough to prevent data |
| /// race. |
| /// |
| /// [`try_lock_explicit`]: Self::try_lock_explicit |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub unsafe fn </span>try_lock_explicit_unchecked(<span class="kw-2">&</span><span class="self">self</span>, lock_order: Ordering, unlock_order: Ordering) -> <span class="prelude-ty">Option</span><Locked<T>> { |
| <span class="kw">if </span>!<span class="self">self</span>.is_locked.swap(<span class="bool-val">true</span>, lock_order) { |
| <span class="prelude-val">Some</span>(Locked { |
| lock: <span class="self">self</span>, |
| order: unlock_order, |
| _p: PhantomData, |
| }) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="doccomment">/// Take the value back out of the lock when this is the sole owner. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="macro">debug_assert!</span>(!<span class="self">self</span>.is_locked.load(Ordering::Relaxed), <span class="string">"TryLock was mem::forgotten"</span>); |
| <span class="comment">// Since the compiler can statically determine this is the only owner, |
| // it's safe to take the value out. In fact, in newer versions of Rust, |
| // `UnsafeCell::into_inner` has been marked safe. |
| // |
| // To support older version (1.21), the unsafe block is still here. |
| </span><span class="attribute">#[allow(unused_unsafe)] |
| </span><span class="kw">unsafe </span>{ |
| <span class="self">self</span>.value.into_inner() |
| } |
| } |
| } |
| |
| <span class="kw">unsafe impl</span><T: Send> Send <span class="kw">for </span>TryLock<T> {} |
| <span class="kw">unsafe impl</span><T: Send> Sync <span class="kw">for </span>TryLock<T> {} |
| |
| <span class="kw">impl</span><T: fmt::Debug> fmt::Debug <span class="kw">for </span>TryLock<T> { |
| <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) -> fmt::Result { |
| |
| <span class="comment">// Used if the TryLock cannot acquire the lock. |
| </span><span class="kw">struct </span>LockedPlaceholder; |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LockedPlaceholder { |
| <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) -> fmt::Result { |
| f.write_str(<span class="string">"<locked>"</span>) |
| } |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = f.debug_struct(<span class="string">"TryLock"</span>); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(locked) = <span class="self">self</span>.try_lock() { |
| builder.field(<span class="string">"value"</span>, <span class="kw-2">&*</span>locked); |
| } <span class="kw">else </span>{ |
| builder.field(<span class="string">"value"</span>, <span class="kw-2">&</span>LockedPlaceholder); |
| } |
| builder.finish() |
| } |
| } |
| |
| <span class="doccomment">/// A locked value acquired from a `TryLock`. |
| /// |
| /// The type represents an exclusive view at the underlying value. The lock is |
| /// released when this type is dropped. |
| /// |
| /// This type derefs to the underlying value. |
| </span><span class="attribute">#[must_use = <span class="string">"TryLock will immediately unlock if not used"</span>] |
| </span><span class="kw">pub struct </span>Locked<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>> { |
| lock: <span class="kw-2">&</span><span class="lifetime">'a </span>TryLock<T>, |
| order: Ordering, |
| <span class="doccomment">/// Suppresses Send and Sync autotraits for `struct Locked`. |
| </span>_p: PhantomData<<span class="kw-2">*mut </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Deref <span class="kw">for </span>Locked<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Target = T; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.lock.value.get() } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> DerefMut <span class="kw">for </span>Locked<<span class="lifetime">'a</span>, T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.lock.value.get() } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Drop <span class="kw">for </span>Locked<<span class="lifetime">'a</span>, 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="self">self</span>.lock.is_locked.store(<span class="bool-val">false</span>, <span class="self">self</span>.order); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: fmt::Debug> fmt::Debug <span class="kw">for </span>Locked<<span class="lifetime">'a</span>, T> { |
| <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) -> fmt::Result { |
| fmt::Debug::fmt(<span class="kw-2">&**</span><span class="self">self</span>, f) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::TryLock; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>fmt_debug() { |
| <span class="kw">let </span>lock = TryLock::new(<span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{:?}"</span>, lock), <span class="string">"TryLock { value: 5 }"</span>); |
| |
| <span class="kw">let </span>locked = lock.try_lock().unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{:?}"</span>, locked), <span class="string">"5"</span>); |
| |
| <span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{:?}"</span>, lock), <span class="string">"TryLock { value: <locked> }"</span>); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="try_lock" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
