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 <!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/task/local.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>local.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="doccomment">//! Runs `!Send` futures on the current thread.
 </span><span class="kw">use </span><span class="kw">crate</span>::loom::cell::UnsafeCell;
 <span class="kw">use </span><span class="kw">crate</span>::loom::sync::{Arc, Mutex};
 <span class="kw">use </span><span class="kw">crate</span>::runtime::task::{<span class="self">self</span>, JoinHandle, LocalOwnedTasks, Task};
 <span class="kw">use </span><span class="kw">crate</span>::runtime::{context, ThreadId};
 <span class="kw">use </span><span class="kw">crate</span>::sync::AtomicWaker;
 <span class="kw">use </span><span class="kw">crate</span>::util::RcCell;

 <span class="kw">use </span>std::cell::Cell;
 <span class="kw">use </span>std::collections::VecDeque;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::future::Future;
 <span class="kw">use </span>std::marker::PhantomData;
 <span class="kw">use </span>std::pin::Pin;
 <span class="kw">use </span>std::rc::Rc;
 <span class="kw">use </span>std::task::Poll;

 <span class="kw">use </span>pin_project_lite::pin_project;

 <span class="macro">cfg_rt! </span>{
     <span class="doccomment">/// A set of tasks which are executed on the same thread.
     ///
     /// In some cases, it is necessary to run one or more futures that do not
     /// implement [`Send`] and thus are unsafe to send between threads. In these
     /// cases, a [local task set] may be used to schedule one or more `!Send`
     /// futures to run together on the same thread.
     ///
     /// For example, the following code will not compile:
     ///
     /// ```rust,compile_fail
     /// use std::rc::Rc;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     // `Rc` does not implement `Send`, and thus may not be sent between
     ///     // threads safely.
     ///     let nonsend_data = Rc::new(&quot;my nonsend data...&quot;);
     ///
     ///     let nonsend_data = nonsend_data.clone();
     ///     // Because the `async` block here moves `nonsend_data`, the future is `!Send`.
     ///     // Since `tokio::spawn` requires the spawned future to implement `Send`, this
     ///     // will not compile.
     ///     tokio::spawn(async move {
     ///         println!(&quot;{}&quot;, nonsend_data);
     ///         // ...
     ///     }).await.unwrap();
     /// }
     /// ```
     ///
     /// # Use with `run_until`
     ///
     /// To spawn `!Send` futures, we can use a local task set to schedule them
     /// on the thread calling [`Runtime::block_on`]. When running inside of the
     /// local task set, we can use [`task::spawn_local`], which can spawn
     /// `!Send` futures. For example:
     ///
     /// ```rust
     /// use std::rc::Rc;
     /// use tokio::task;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let nonsend_data = Rc::new(&quot;my nonsend data...&quot;);
     ///
     ///     // Construct a local task set that can run `!Send` futures.
     ///     let local = task::LocalSet::new();
     ///
     ///     // Run the local task set.
     ///     local.run_until(async move {
     ///         let nonsend_data = nonsend_data.clone();
     ///         // `spawn_local` ensures that the future is spawned on the local
     ///         // task set.
     ///         task::spawn_local(async move {
     ///             println!(&quot;{}&quot;, nonsend_data);
     ///             // ...
     ///         }).await.unwrap();
     ///     }).await;
     /// }
     /// ```
     /// **Note:** The `run_until` method can only be used in `#[tokio::main]`,
     /// `#[tokio::test]` or directly inside a call to [`Runtime::block_on`]. It
     /// cannot be used inside a task spawned with `tokio::spawn`.
     ///
     /// ## Awaiting a `LocalSet`
     ///
     /// Additionally, a `LocalSet` itself implements `Future`, completing when
     /// *all* tasks spawned on the `LocalSet` complete. This can be used to run
     /// several futures on a `LocalSet` and drive the whole set until they
     /// complete. For example,
     ///
     /// ```rust
     /// use tokio::{task, time};
     /// use std::rc::Rc;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let nonsend_data = Rc::new(&quot;world&quot;);
     ///     let local = task::LocalSet::new();
     ///
     ///     let nonsend_data2 = nonsend_data.clone();
     ///     local.spawn_local(async move {
     ///         // ...
     ///         println!(&quot;hello {}&quot;, nonsend_data2)
     ///     });
     ///
     ///     local.spawn_local(async move {
     ///         time::sleep(time::Duration::from_millis(100)).await;
     ///         println!(&quot;goodbye {}&quot;, nonsend_data)
     ///     });
     ///
     ///     // ...
     ///
     ///     local.await;
     /// }
     /// ```
     /// **Note:** Awaiting a `LocalSet` can only be done inside
     /// `#[tokio::main]`, `#[tokio::test]` or directly inside a call to
     /// [`Runtime::block_on`]. It cannot be used inside a task spawned with
     /// `tokio::spawn`.
     ///
     /// ## Use inside `tokio::spawn`
     ///
     /// The two methods mentioned above cannot be used inside `tokio::spawn`, so
     /// to spawn `!Send` futures from inside `tokio::spawn`, we need to do
     /// something else. The solution is to create the `LocalSet` somewhere else,
     /// and communicate with it using an [`mpsc`] channel.
     ///
     /// The following example puts the `LocalSet` inside a new thread.
     /// ```
     /// use tokio::runtime::Builder;
     /// use tokio::sync::{mpsc, oneshot};
     /// use tokio::task::LocalSet;
     ///
     /// // This struct describes the task you want to spawn. Here we include
     /// // some simple examples. The oneshot channel allows sending a response
     /// // to the spawner.
     /// #[derive(Debug)]
     /// enum Task {
     ///     PrintNumber(u32),
     ///     AddOne(u32, oneshot::Sender&lt;u32&gt;),
     /// }
     ///
     /// #[derive(Clone)]
     /// struct LocalSpawner {
     ///    send: mpsc::UnboundedSender&lt;Task&gt;,
     /// }
     ///
     /// impl LocalSpawner {
     ///     pub fn new() -&gt; Self {
     ///         let (send, mut recv) = mpsc::unbounded_channel();
     ///
     ///         let rt = Builder::new_current_thread()
     ///             .enable_all()
     ///             .build()
     ///             .unwrap();
     ///
     ///         std::thread::spawn(move || {
     ///             let local = LocalSet::new();
     ///
     ///             local.spawn_local(async move {
     ///                 while let Some(new_task) = recv.recv().await {
     ///                     tokio::task::spawn_local(run_task(new_task));
     ///                 }
     ///                 // If the while loop returns, then all the LocalSpawner
     ///                 // objects have been dropped.
     ///             });
     ///
     ///             // This will return once all senders are dropped and all
     ///             // spawned tasks have returned.
     ///             rt.block_on(local);
     ///         });
     ///
     ///         Self {
     ///             send,
     ///         }
     ///     }
     ///
     ///     pub fn spawn(&amp;self, task: Task) {
     ///         self.send.send(task).expect(&quot;Thread with LocalSet has shut down.&quot;);
     ///     }
     /// }
     ///
     /// // This task may do !Send stuff. We use printing a number as an example,
     /// // but it could be anything.
     /// //
     /// // The Task struct is an enum to support spawning many different kinds
     /// // of operations.
     /// async fn run_task(task: Task) {
     ///     match task {
     ///         Task::PrintNumber(n) =&gt; {
     ///             println!(&quot;{}&quot;, n);
     ///         },
     ///         Task::AddOne(n, response) =&gt; {
     ///             // We ignore failures to send the response.
     ///             let _ = response.send(n + 1);
     ///         },
     ///     }
     /// }
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let spawner = LocalSpawner::new();
     ///
     ///     let (send, response) = oneshot::channel();
     ///     spawner.spawn(Task::AddOne(10, send));
     ///     let eleven = response.await.unwrap();
     ///     assert_eq!(eleven, 11);
     /// }
     /// ```
     ///
     /// [`Send`]: trait@std::marker::Send
     /// [local task set]: struct@LocalSet
     /// [`Runtime::block_on`]: method@crate::runtime::Runtime::block_on
     /// [`task::spawn_local`]: fn@spawn_local
     /// [`mpsc`]: mod@crate::sync::mpsc
     </span><span class="kw">pub struct </span>LocalSet {
         <span class="doccomment">/// Current scheduler tick.
         </span>tick: Cell&lt;u8&gt;,

         <span class="doccomment">/// State available from thread-local.
         </span>context: Rc&lt;Context&gt;,

         <span class="doccomment">/// This type should not be Send.
         </span>_not_send: PhantomData&lt;<span class="kw-2">*const </span>()&gt;,
     }
 }

 <span class="doccomment">/// State available from the thread-local.
 </span><span class="kw">struct </span>Context {
     <span class="doccomment">/// State shared between threads.
     </span>shared: Arc&lt;Shared&gt;,

     <span class="doccomment">/// True if a task panicked without being handled and the local set is
     /// configured to shutdown on unhandled panic.
     </span>unhandled_panic: Cell&lt;bool&gt;,
 }

 <span class="doccomment">/// LocalSet state shared between threads.
 </span><span class="kw">struct </span>Shared {
     <span class="doccomment">/// # Safety
     ///
     /// This field must *only* be accessed from the thread that owns the
     /// `LocalSet` (i.e., `Thread::current().id() == owner`).
     </span>local_state: LocalState,

     <span class="doccomment">/// Remote run queue sender.
     </span>queue: Mutex&lt;<span class="prelude-ty">Option</span>&lt;VecDeque&lt;task::Notified&lt;Arc&lt;Shared&gt;&gt;&gt;&gt;&gt;,

     <span class="doccomment">/// Wake the `LocalSet` task.
     </span>waker: AtomicWaker,

     <span class="doccomment">/// How to respond to unhandled task panics.
     </span><span class="attribute">#[cfg(tokio_unstable)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) unhandled_panic: <span class="kw">crate</span>::runtime::UnhandledPanic,
 }

 <span class="doccomment">/// Tracks the `LocalSet` state that must only be accessed from the thread that
 /// created the `LocalSet`.
 </span><span class="kw">struct </span>LocalState {
     <span class="doccomment">/// The `ThreadId` of the thread that owns the `LocalSet`.
     </span>owner: ThreadId,

     <span class="doccomment">/// Local run queue sender and receiver.
     </span>local_queue: UnsafeCell&lt;VecDeque&lt;task::Notified&lt;Arc&lt;Shared&gt;&gt;&gt;&gt;,

     <span class="doccomment">/// Collection of all active tasks spawned onto this executor.
     </span>owned: LocalOwnedTasks&lt;Arc&lt;Shared&gt;&gt;,
 }

 <span class="macro">pin_project! </span>{
     <span class="attribute">#[derive(Debug)]
     </span><span class="kw">struct </span>RunUntil&lt;<span class="lifetime">&#39;a</span>, F&gt; {
         local_set: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>LocalSet,
         <span class="attribute">#[pin]
         </span>future: F,
     }
 }

 <span class="macro">tokio_thread_local!</span>(<span class="kw">static </span>CURRENT: LocalData = <span class="kw">const </span>{ LocalData {
     ctx: RcCell::new(),
 } });

 <span class="kw">struct </span>LocalData {
     ctx: RcCell&lt;Context&gt;,
 }

 <span class="macro">cfg_rt! </span>{
     <span class="doccomment">/// Spawns a `!Send` future on the current [`LocalSet`].
     ///
     /// The spawned future will run on the same thread that called `spawn_local`.
     ///
     /// The provided future will start running in the background immediately
     /// when `spawn_local` is called, even if you don&#39;t await the returned
     /// `JoinHandle`.
     ///
     /// # Panics
     ///
     /// This function panics if called outside of a [`LocalSet`].
     ///
     /// Note that if [`tokio::spawn`] is used from within a `LocalSet`, the
     /// resulting new task will _not_ be inside the `LocalSet`, so you must use
     /// use `spawn_local` if you want to stay within the `LocalSet`.
     ///
     /// # Examples
     ///
     /// ```rust
     /// use std::rc::Rc;
     /// use tokio::task;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let nonsend_data = Rc::new(&quot;my nonsend data...&quot;);
     ///
     ///     let local = task::LocalSet::new();
     ///
     ///     // Run the local task set.
     ///     local.run_until(async move {
     ///         let nonsend_data = nonsend_data.clone();
     ///         task::spawn_local(async move {
     ///             println!(&quot;{}&quot;, nonsend_data);
     ///             // ...
     ///         }).await.unwrap();
     ///     }).await;
     /// }
     /// ```
     ///
     /// [`LocalSet`]: struct@crate::task::LocalSet
     /// [`tokio::spawn`]: fn@crate::task::spawn
     </span><span class="attribute">#[track_caller]
     </span><span class="kw">pub fn </span>spawn_local&lt;F&gt;(future: F) -&gt; JoinHandle&lt;F::Output&gt;
     <span class="kw">where
         </span>F: Future + <span class="lifetime">&#39;static</span>,
         F::Output: <span class="lifetime">&#39;static</span>,
     {
         spawn_local_inner(future, <span class="prelude-val">None</span>)
     }


     <span class="attribute">#[track_caller]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>spawn_local_inner&lt;F&gt;(future: F, name: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>str&gt;) -&gt; JoinHandle&lt;F::Output&gt;
     <span class="kw">where </span>F: Future + <span class="lifetime">&#39;static</span>,
           F::Output: <span class="lifetime">&#39;static
     </span>{
         <span class="kw">match </span>CURRENT.with(|LocalData { ctx, .. }| ctx.get()) {
             <span class="prelude-val">None </span>=&gt; <span class="macro">panic!</span>(<span class="string">&quot;`spawn_local` called from outside of a `task::LocalSet`&quot;</span>),
             <span class="prelude-val">Some</span>(cx) =&gt; cx.spawn(future, name)
        }
     }
 }

 <span class="doccomment">/// Initial queue capacity.
 </span><span class="kw">const </span>INITIAL_CAPACITY: usize = <span class="number">64</span>;

 <span class="doccomment">/// Max number of tasks to poll per tick.
 </span><span class="kw">const </span>MAX_TASKS_PER_TICK: usize = <span class="number">61</span>;

 <span class="doccomment">/// How often it check the remote queue first.
 </span><span class="kw">const </span>REMOTE_FIRST_INTERVAL: u8 = <span class="number">31</span>;

 <span class="doccomment">/// Context guard for LocalSet
 </span><span class="kw">pub struct </span>LocalEnterGuard(<span class="prelude-ty">Option</span>&lt;Rc&lt;Context&gt;&gt;);

 <span class="kw">impl </span>Drop <span class="kw">for </span>LocalEnterGuard {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         CURRENT.with(|LocalData { ctx, .. }| {
             ctx.set(<span class="self">self</span>.<span class="number">0</span>.take());
         })
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LocalEnterGuard {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;LocalEnterGuard&quot;</span>).finish()
     }
 }

 <span class="kw">impl </span>LocalSet {
     <span class="doccomment">/// Returns a new local task set.
     </span><span class="kw">pub fn </span>new() -&gt; LocalSet {
         <span class="kw">let </span>owner = context::thread_id().expect(<span class="string">&quot;cannot create LocalSet during thread shutdown&quot;</span>);

         LocalSet {
             tick: Cell::new(<span class="number">0</span>),
             context: Rc::new(Context {
                 shared: Arc::new(Shared {
                     local_state: LocalState {
                         owner,
                         owned: LocalOwnedTasks::new(),
                         local_queue: UnsafeCell::new(VecDeque::with_capacity(INITIAL_CAPACITY)),
                     },
                     queue: Mutex::new(<span class="prelude-val">Some</span>(VecDeque::with_capacity(INITIAL_CAPACITY))),
                     waker: AtomicWaker::new(),
                     <span class="attribute">#[cfg(tokio_unstable)]
                     </span>unhandled_panic: <span class="kw">crate</span>::runtime::UnhandledPanic::Ignore,
                 }),
                 unhandled_panic: Cell::new(<span class="bool-val">false</span>),
             }),
             _not_send: PhantomData,
         }
     }

     <span class="doccomment">/// Enters the context of this `LocalSet`.
     ///
     /// The [`spawn_local`] method will spawn tasks on the `LocalSet` whose
     /// context you are inside.
     ///
     /// [`spawn_local`]: fn@crate::task::spawn_local
     </span><span class="kw">pub fn </span>enter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LocalEnterGuard {
         CURRENT.with(|LocalData { ctx, .. }| {
             <span class="kw">let </span>old = ctx.replace(<span class="prelude-val">Some</span>(<span class="self">self</span>.context.clone()));
             LocalEnterGuard(old)
         })
     }

     <span class="doccomment">/// Spawns a `!Send` task onto the local task set.
     ///
     /// This task is guaranteed to be run on the current thread.
     ///
     /// Unlike the free function [`spawn_local`], this method may be used to
     /// spawn local tasks when the `LocalSet` is _not_ running. The provided
     /// future will start running once the `LocalSet` is next started, even if
     /// you don&#39;t await the returned `JoinHandle`.
     ///
     /// # Examples
     ///
     /// ```rust
     /// use tokio::task;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let local = task::LocalSet::new();
     ///
     ///     // Spawn a future on the local set. This future will be run when
     ///     // we call `run_until` to drive the task set.
     ///     local.spawn_local(async {
     ///        // ...
     ///     });
     ///
     ///     // Run the local task set.
     ///     local.run_until(async move {
     ///         // ...
     ///     }).await;
     ///
     ///     // When `run` finishes, we can spawn _more_ futures, which will
     ///     // run in subsequent calls to `run_until`.
     ///     local.spawn_local(async {
     ///        // ...
     ///     });
     ///
     ///     local.run_until(async move {
     ///         // ...
     ///     }).await;
     /// }
     /// ```
     /// [`spawn_local`]: fn@spawn_local
     </span><span class="attribute">#[track_caller]
     </span><span class="kw">pub fn </span>spawn_local&lt;F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, future: F) -&gt; JoinHandle&lt;F::Output&gt;
     <span class="kw">where
         </span>F: Future + <span class="lifetime">&#39;static</span>,
         F::Output: <span class="lifetime">&#39;static</span>,
     {
         <span class="self">self</span>.spawn_named(future, <span class="prelude-val">None</span>)
     }

     <span class="doccomment">/// Runs a future to completion on the provided runtime, driving any local
     /// futures spawned on this task set on the current thread.
     ///
     /// This runs the given future on the runtime, blocking until it is
     /// complete, and yielding its resolved result. Any tasks or timers which
     /// the future spawns internally will be executed on the runtime. The future
     /// may also call [`spawn_local`] to spawn_local additional local futures on the
     /// current thread.
     ///
     /// This method should not be called from an asynchronous context.
     ///
     /// # Panics
     ///
     /// This function panics if the executor is at capacity, if the provided
     /// future panics, or if called within an asynchronous execution context.
     ///
     /// # Notes
     ///
     /// Since this function internally calls [`Runtime::block_on`], and drives
     /// futures in the local task set inside that call to `block_on`, the local
     /// futures may not use [in-place blocking]. If a blocking call needs to be
     /// issued from a local task, the [`spawn_blocking`] API may be used instead.
     ///
     /// For example, this will panic:
     /// ```should_panic
     /// use tokio::runtime::Runtime;
     /// use tokio::task;
     ///
     /// let rt  = Runtime::new().unwrap();
     /// let local = task::LocalSet::new();
     /// local.block_on(&amp;rt, async {
     ///     let join = task::spawn_local(async {
     ///         let blocking_result = task::block_in_place(|| {
     ///             // ...
     ///         });
     ///         // ...
     ///     });
     ///     join.await.unwrap();
     /// })
     /// ```
     /// This, however, will not panic:
     /// ```
     /// use tokio::runtime::Runtime;
     /// use tokio::task;
     ///
     /// let rt  = Runtime::new().unwrap();
     /// let local = task::LocalSet::new();
     /// local.block_on(&amp;rt, async {
     ///     let join = task::spawn_local(async {
     ///         let blocking_result = task::spawn_blocking(|| {
     ///             // ...
     ///         }).await;
     ///         // ...
     ///     });
     ///     join.await.unwrap();
     /// })
     /// ```
     ///
     /// [`spawn_local`]: fn@spawn_local
     /// [`Runtime::block_on`]: method@crate::runtime::Runtime::block_on
     /// [in-place blocking]: fn@crate::task::block_in_place
     /// [`spawn_blocking`]: fn@crate::task::spawn_blocking
     </span><span class="attribute">#[track_caller]
     #[cfg(feature = <span class="string">&quot;rt&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;rt&quot;</span>)))]
     </span><span class="kw">pub fn </span>block_on&lt;F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, rt: <span class="kw-2">&amp;</span><span class="kw">crate</span>::runtime::Runtime, future: F) -&gt; F::Output
     <span class="kw">where
         </span>F: Future,
     {
         rt.block_on(<span class="self">self</span>.run_until(future))
     }

     <span class="doccomment">/// Runs a future to completion on the local set, returning its output.
     ///
     /// This returns a future that runs the given future with a local set,
     /// allowing it to call [`spawn_local`] to spawn additional `!Send` futures.
     /// Any local futures spawned on the local set will be driven in the
     /// background until the future passed to `run_until` completes. When the future
     /// passed to `run` finishes, any local futures which have not completed
     /// will remain on the local set, and will be driven on subsequent calls to
     /// `run_until` or when [awaiting the local set] itself.
     ///
     /// # Examples
     ///
     /// ```rust
     /// use tokio::task;
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     task::LocalSet::new().run_until(async {
     ///         task::spawn_local(async move {
     ///             // ...
     ///         }).await.unwrap();
     ///         // ...
     ///     }).await;
     /// }
     /// ```
     ///
     /// [`spawn_local`]: fn@spawn_local
     /// [awaiting the local set]: #awaiting-a-localset
     </span><span class="kw">pub async fn </span>run_until&lt;F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, future: F) -&gt; F::Output
     <span class="kw">where
         </span>F: Future,
     {
         <span class="kw">let </span>run_until = RunUntil {
             future,
             local_set: <span class="self">self</span>,
         };
         run_until.<span class="kw">await
     </span>}

     <span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::task) <span class="kw">fn </span>spawn_named&lt;F&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         future: F,
         name: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>str&gt;,
     ) -&gt; JoinHandle&lt;F::Output&gt;
     <span class="kw">where
         </span>F: Future + <span class="lifetime">&#39;static</span>,
         F::Output: <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>handle = <span class="self">self</span>.context.spawn(future, name);

         <span class="comment">// Because a task was spawned from *outside* the `LocalSet`, wake the
         // `LocalSet` future to execute the new task, if it hasn&#39;t been woken.
         //
         // Spawning via the free fn `spawn` does not require this, as it can
         // only be called from *within* a future executing on the `LocalSet` —
         // in that case, the `LocalSet` must already be awake.
         </span><span class="self">self</span>.context.shared.waker.wake();
         handle
     }

     <span class="doccomment">/// Ticks the scheduler, returning whether the local future needs to be
     /// notified again.
     </span><span class="kw">fn </span>tick(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="kw">for _ in </span><span class="number">0</span>..MAX_TASKS_PER_TICK {
             <span class="comment">// Make sure we didn&#39;t hit an unhandled panic
             </span><span class="kw">if </span><span class="self">self</span>.context.unhandled_panic.get() {
                 <span class="macro">panic!</span>(<span class="string">&quot;a spawned task panicked and the LocalSet is configured to shutdown on unhandled panic&quot;</span>);
             }

             <span class="kw">match </span><span class="self">self</span>.next_task() {
                 <span class="comment">// Run the task
                 //
                 // Safety: As spawned tasks are `!Send`, `run_unchecked` must be
                 // used. We are responsible for maintaining the invariant that
                 // `run_unchecked` is only called on threads that spawned the
                 // task initially. Because `LocalSet` itself is `!Send`, and
                 // `spawn_local` spawns into the `LocalSet` on the current
                 // thread, the invariant is maintained.
                 </span><span class="prelude-val">Some</span>(task) =&gt; <span class="kw">crate</span>::runtime::coop::budget(|| task.run()),
                 <span class="comment">// We have fully drained the queue of notified tasks, so the
                 // local future doesn&#39;t need to be notified again — it can wait
                 // until something else wakes a task in the local set.
                 </span><span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="bool-val">false</span>,
             }
         }

         <span class="bool-val">true
     </span>}

     <span class="kw">fn </span>next_task(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;task::LocalNotified&lt;Arc&lt;Shared&gt;&gt;&gt; {
         <span class="kw">let </span>tick = <span class="self">self</span>.tick.get();
         <span class="self">self</span>.tick.set(tick.wrapping_add(<span class="number">1</span>));

         <span class="kw">let </span>task = <span class="kw">if </span>tick % REMOTE_FIRST_INTERVAL == <span class="number">0 </span>{
             <span class="self">self</span>.context
                 .shared
                 .queue
                 .lock()
                 .as_mut()
                 .and_then(|queue| queue.pop_front())
                 .or_else(|| <span class="self">self</span>.pop_local())
         } <span class="kw">else </span>{
             <span class="self">self</span>.pop_local().or_else(|| {
                 <span class="self">self</span>.context
                     .shared
                     .queue
                     .lock()
                     .as_mut()
                     .and_then(|queue| queue.pop_front())
             })
         };

         task.map(|task| <span class="kw">unsafe </span>{
             <span class="comment">// Safety: because the `LocalSet` itself is `!Send`, we know we are
             // on the same thread if we have access to the `LocalSet`, and can
             // therefore access the local run queue.
             </span><span class="self">self</span>.context.shared.local_state.assert_owner(task)
         })
     }

     <span class="kw">fn </span>pop_local(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;task::Notified&lt;Arc&lt;Shared&gt;&gt;&gt; {
         <span class="kw">unsafe </span>{
             <span class="comment">// Safety: because the `LocalSet` itself is `!Send`, we know we are
             // on the same thread if we have access to the `LocalSet`, and can
             // therefore access the local run queue.
             </span><span class="self">self</span>.context.shared.local_state.task_pop_front()
         }
     }

     <span class="kw">fn </span>with&lt;T&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce() -&gt; T) -&gt; T {
         CURRENT.with(|LocalData { ctx, .. }| {
             <span class="kw">struct </span>Reset&lt;<span class="lifetime">&#39;a</span>&gt; {
                 ctx_ref: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>RcCell&lt;Context&gt;,
                 val: <span class="prelude-ty">Option</span>&lt;Rc&lt;Context&gt;&gt;,
             }
             <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Reset&lt;<span class="lifetime">&#39;a</span>&gt; {
                 <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
                     <span class="self">self</span>.ctx_ref.set(<span class="self">self</span>.val.take());
                 }
             }
             <span class="kw">let </span>old = ctx.replace(<span class="prelude-val">Some</span>(<span class="self">self</span>.context.clone()));

             <span class="kw">let </span>_reset = Reset {
                 ctx_ref: ctx,
                 val: old,
             };

             f()
         })
     }

     <span class="doccomment">/// This method is like `with`, but it just calls `f` without setting the thread-local if that
     /// fails.
     </span><span class="kw">fn </span>with_if_possible&lt;T&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce() -&gt; T) -&gt; T {
         <span class="kw">let </span><span class="kw-2">mut </span>f = <span class="prelude-val">Some</span>(f);

         <span class="kw">let </span>res = CURRENT.try_with(|LocalData { ctx, .. }| {
             <span class="kw">struct </span>Reset&lt;<span class="lifetime">&#39;a</span>&gt; {
                 ctx_ref: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>RcCell&lt;Context&gt;,
                 val: <span class="prelude-ty">Option</span>&lt;Rc&lt;Context&gt;&gt;,
             }
             <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Drop <span class="kw">for </span>Reset&lt;<span class="lifetime">&#39;a</span>&gt; {
                 <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
                     <span class="self">self</span>.ctx_ref.replace(<span class="self">self</span>.val.take());
                 }
             }
             <span class="kw">let </span>old = ctx.replace(<span class="prelude-val">Some</span>(<span class="self">self</span>.context.clone()));

             <span class="kw">let </span>_reset = Reset {
                 ctx_ref: ctx,
                 val: old,
             };

             (f.take().unwrap())()
         });

         <span class="kw">match </span>res {
             <span class="prelude-val">Ok</span>(res) =&gt; res,
             <span class="prelude-val">Err</span>(_access_error) =&gt; (f.take().unwrap())(),
         }
     }
 }

 <span class="macro">cfg_unstable! </span>{
     <span class="kw">impl </span>LocalSet {
         <span class="doccomment">/// Configure how the `LocalSet` responds to an unhandled panic on a
         /// spawned task.
         ///
         /// By default, an unhandled panic (i.e. a panic not caught by
         /// [`std::panic::catch_unwind`]) has no impact on the `LocalSet`&#39;s
         /// execution. The panic is error value is forwarded to the task&#39;s
         /// [`JoinHandle`] and all other spawned tasks continue running.
         ///
         /// The `unhandled_panic` option enables configuring this behavior.
         ///
         /// * `UnhandledPanic::Ignore` is the default behavior. Panics on
         ///   spawned tasks have no impact on the `LocalSet`&#39;s execution.
         /// * `UnhandledPanic::ShutdownRuntime` will force the `LocalSet` to
         ///   shutdown immediately when a spawned task panics even if that
         ///   task&#39;s `JoinHandle` has not been dropped. All other spawned tasks
         ///   will immediately terminate and further calls to
         ///   [`LocalSet::block_on`] and [`LocalSet::run_until`] will panic.
         ///
         /// # Panics
         ///
         /// This method panics if called after the `LocalSet` has started
         /// running.
         ///
         /// # Unstable
         ///
         /// This option is currently unstable and its implementation is
         /// incomplete. The API may change or be removed in the future. See
         /// tokio-rs/tokio#4516 for more details.
         ///
         /// # Examples
         ///
         /// The following demonstrates a `LocalSet` configured to shutdown on
         /// panic. The first spawned task panics and results in the `LocalSet`
         /// shutting down. The second spawned task never has a chance to
         /// execute. The call to `run_until` will panic due to the runtime being
         /// forcibly shutdown.
         ///
         /// ```should_panic
         /// use tokio::runtime::UnhandledPanic;
         ///
         /// # #[tokio::main]
         /// # async fn main() {
         /// tokio::task::LocalSet::new()
         ///     .unhandled_panic(UnhandledPanic::ShutdownRuntime)
         ///     .run_until(async {
         ///         tokio::task::spawn_local(async { panic!(&quot;boom&quot;); });
         ///         tokio::task::spawn_local(async {
         ///             // This task never completes
         ///         });
         ///
         ///         // Do some work, but `run_until` will panic before it completes
         /// # loop { tokio::task::yield_now().await; }
         ///     })
         ///     .await;
         /// # }
         /// ```
         ///
         /// [`JoinHandle`]: struct@crate::task::JoinHandle
         </span><span class="kw">pub fn </span>unhandled_panic(<span class="kw-2">&amp;mut </span><span class="self">self</span>, behavior: <span class="kw">crate</span>::runtime::UnhandledPanic) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
             <span class="comment">// TODO: This should be set as a builder
             </span>Rc::get_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>.context)
                 .and_then(|ctx| Arc::get_mut(<span class="kw-2">&amp;mut </span>ctx.shared))
                 .expect(<span class="string">&quot;Unhandled Panic behavior modified after starting LocalSet&quot;</span>)
                 .unhandled_panic = behavior;
             <span class="self">self
         </span>}
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LocalSet {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         fmt.debug_struct(<span class="string">&quot;LocalSet&quot;</span>).finish()
     }
 }

 <span class="kw">impl </span>Future <span class="kw">for </span>LocalSet {
     <span class="kw">type </span>Output = ();

     <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>std::task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="comment">// Register the waker before starting to work
         </span><span class="self">self</span>.context.shared.waker.register_by_ref(cx.waker());

         <span class="kw">if </span><span class="self">self</span>.with(|| <span class="self">self</span>.tick()) {
             <span class="comment">// If `tick` returns true, we need to notify the local future again:
             // there are still tasks remaining in the run queue.
             </span>cx.waker().wake_by_ref();
             Poll::Pending

         <span class="comment">// Safety: called from the thread that owns `LocalSet`. Because
         // `LocalSet` is `!Send`, this is safe.
         </span>} <span class="kw">else if unsafe </span>{ <span class="self">self</span>.context.shared.local_state.owned_is_empty() } {
             <span class="comment">// If the scheduler has no remaining futures, we&#39;re done!
             </span>Poll::Ready(())
         } <span class="kw">else </span>{
             <span class="comment">// There are still futures in the local set, but we&#39;ve polled all the
             // futures in the run queue. Therefore, we can just return Pending
             // since the remaining futures will be woken from somewhere else.
             </span>Poll::Pending
         }
     }
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>LocalSet {
     <span class="kw">fn </span>default() -&gt; LocalSet {
         LocalSet::new()
     }
 }

 <span class="kw">impl </span>Drop <span class="kw">for </span>LocalSet {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.with_if_possible(|| {
             <span class="comment">// Shut down all tasks in the LocalOwnedTasks and close it to
             // prevent new tasks from ever being added.
             </span><span class="kw">unsafe </span>{
                 <span class="comment">// Safety: called from the thread that owns `LocalSet`
                 </span><span class="self">self</span>.context.shared.local_state.close_and_shutdown_all();
             }

             <span class="comment">// We already called shutdown on all tasks above, so there is no
             // need to call shutdown.

             // Safety: note that this *intentionally* bypasses the unsafe
             // `Shared::local_queue()` method. This is in order to avoid the
             // debug assertion that we are on the thread that owns the
             // `LocalSet`, because on some systems (e.g. at least some macOS
             // versions), attempting to get the current thread ID can panic due
             // to the thread&#39;s local data that stores the thread ID being
             // dropped *before* the `LocalSet`.
             //
             // Despite avoiding the assertion here, it is safe for us to access
             // the local queue in `Drop`, because the `LocalSet` itself is
             // `!Send`, so we can reasonably guarantee that it will not be
             // `Drop`ped from another thread.
             </span><span class="kw">let </span>local_queue = <span class="kw">unsafe </span>{
                 <span class="comment">// Safety: called from the thread that owns `LocalSet`
                 </span><span class="self">self</span>.context.shared.local_state.take_local_queue()
             };
             <span class="kw">for </span>task <span class="kw">in </span>local_queue {
                 drop(task);
             }

             <span class="comment">// Take the queue from the Shared object to prevent pushing
             // notifications to it in the future.
             </span><span class="kw">let </span>queue = <span class="self">self</span>.context.shared.queue.lock().take().unwrap();
             <span class="kw">for </span>task <span class="kw">in </span>queue {
                 drop(task);
             }

             <span class="comment">// Safety: called from the thread that owns `LocalSet`
             </span><span class="macro">assert!</span>(<span class="kw">unsafe </span>{ <span class="self">self</span>.context.shared.local_state.owned_is_empty() });
         });
     }
 }

 <span class="comment">// === impl Context ===

 </span><span class="kw">impl </span>Context {
     <span class="attribute">#[track_caller]
     </span><span class="kw">fn </span>spawn&lt;F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, future: F, name: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>str&gt;) -&gt; JoinHandle&lt;F::Output&gt;
     <span class="kw">where
         </span>F: Future + <span class="lifetime">&#39;static</span>,
         F::Output: <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">let </span>id = <span class="kw">crate</span>::runtime::task::Id::next();
         <span class="kw">let </span>future = <span class="kw">crate</span>::util::trace::task(future, <span class="string">&quot;local&quot;</span>, name, id.as_u64());

         <span class="comment">// Safety: called from the thread that owns the `LocalSet`
         </span><span class="kw">let </span>(handle, notified) = {
             <span class="self">self</span>.shared.local_state.assert_called_from_owner_thread();
             <span class="self">self</span>.shared
                 .local_state
                 .owned
                 .bind(future, <span class="self">self</span>.shared.clone(), id)
         };

         <span class="kw">if let </span><span class="prelude-val">Some</span>(notified) = notified {
             <span class="self">self</span>.shared.schedule(notified);
         }

         handle
     }
 }

 <span class="comment">// === impl LocalFuture ===

 </span><span class="kw">impl</span>&lt;T: Future&gt; Future <span class="kw">for </span>RunUntil&lt;<span class="lifetime">&#39;_</span>, T&gt; {
     <span class="kw">type </span>Output = T::Output;

     <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>std::task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">let </span>me = <span class="self">self</span>.project();

         me.local_set.with(|| {
             me.local_set
                 .context
                 .shared
                 .waker
                 .register_by_ref(cx.waker());

             <span class="kw">let </span>_no_blocking = <span class="kw">crate</span>::runtime::context::disallow_block_in_place();
             <span class="kw">let </span>f = me.future;

             <span class="kw">if let </span>Poll::Ready(output) = f.poll(cx) {
                 <span class="kw">return </span>Poll::Ready(output);
             }

             <span class="kw">if </span>me.local_set.tick() {
                 <span class="comment">// If `tick` returns `true`, we need to notify the local future again:
                 // there are still tasks remaining in the run queue.
                 </span>cx.waker().wake_by_ref();
             }

             Poll::Pending
         })
     }
 }

 <span class="kw">impl </span>Shared {
     <span class="doccomment">/// Schedule the provided task on the scheduler.
     </span><span class="kw">fn </span>schedule(<span class="kw-2">&amp;</span><span class="self">self</span>, task: task::Notified&lt;Arc&lt;<span class="self">Self</span>&gt;&gt;) {
         CURRENT.with(|localdata| {
             <span class="kw">match </span>localdata.ctx.get() {
                 <span class="prelude-val">Some</span>(cx) <span class="kw">if </span>cx.shared.ptr_eq(<span class="self">self</span>) =&gt; <span class="kw">unsafe </span>{
                     <span class="comment">// Safety: if the current `LocalSet` context points to this
                     // `LocalSet`, then we are on the thread that owns it.
                     </span>cx.shared.local_state.task_push_back(task);
                 },

                 <span class="comment">// We are on the thread that owns the `LocalSet`, so we can
                 // wake to the local queue.
                 </span><span class="kw">_ if </span>context::thread_id().ok() == <span class="prelude-val">Some</span>(<span class="self">self</span>.local_state.owner) =&gt; {
                     <span class="kw">unsafe </span>{
                         <span class="comment">// Safety: we just checked that the thread ID matches
                         // the localset&#39;s owner, so this is safe.
                         </span><span class="self">self</span>.local_state.task_push_back(task);
                     }
                     <span class="comment">// We still have to wake the `LocalSet`, because it isn&#39;t
                     // currently being polled.
                     </span><span class="self">self</span>.waker.wake();
                 }

                 <span class="comment">// We are *not* on the thread that owns the `LocalSet`, so we
                 // have to wake to the remote queue.
                 </span><span class="kw">_ </span>=&gt; {
                     <span class="comment">// First, check whether the queue is still there (if not, the
                     // LocalSet is dropped). Then push to it if so, and if not,
                     // do nothing.
                     </span><span class="kw">let </span><span class="kw-2">mut </span>lock = <span class="self">self</span>.queue.lock();

                     <span class="kw">if let </span><span class="prelude-val">Some</span>(queue) = lock.as_mut() {
                         queue.push_back(task);
                         drop(lock);
                         <span class="self">self</span>.waker.wake();
                     }
                 }
             }
         });
     }

     <span class="kw">fn </span>ptr_eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Shared) -&gt; bool {
         std::ptr::eq(<span class="self">self</span>, other)
     }
 }

 <span class="comment">// This is safe because (and only because) we *pinky pwomise* to never touch the
 // local run queue except from the thread that owns the `LocalSet`.
 </span><span class="kw">unsafe impl </span>Sync <span class="kw">for </span>Shared {}

 <span class="kw">impl </span>task::Schedule <span class="kw">for </span>Arc&lt;Shared&gt; {
     <span class="kw">fn </span>release(<span class="kw-2">&amp;</span><span class="self">self</span>, task: <span class="kw-2">&amp;</span>Task&lt;<span class="self">Self</span>&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;Task&lt;<span class="self">Self</span>&gt;&gt; {
         <span class="comment">// Safety, this is always called from the thread that owns `LocalSet`
         </span><span class="kw">unsafe </span>{ <span class="self">self</span>.local_state.task_remove(task) }
     }

     <span class="kw">fn </span>schedule(<span class="kw-2">&amp;</span><span class="self">self</span>, task: task::Notified&lt;<span class="self">Self</span>&gt;) {
         Shared::schedule(<span class="self">self</span>, task);
     }

     <span class="macro">cfg_unstable! </span>{
         <span class="kw">fn </span>unhandled_panic(<span class="kw-2">&amp;</span><span class="self">self</span>) {
             <span class="kw">use </span><span class="kw">crate</span>::runtime::UnhandledPanic;

             <span class="kw">match </span><span class="self">self</span>.unhandled_panic {
                 UnhandledPanic::Ignore =&gt; {
                     <span class="comment">// Do nothing
                 </span>}
                 UnhandledPanic::ShutdownRuntime =&gt; {
                     <span class="comment">// This hook is only called from within the runtime, so
                     // `CURRENT` should match with `&amp;self`, i.e. there is no
                     // opportunity for a nested scheduler to be called.
                     </span>CURRENT.with(|LocalData { ctx, .. }| <span class="kw">match </span>ctx.get() {
                         <span class="prelude-val">Some</span>(cx) <span class="kw">if </span>Arc::ptr_eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>cx.shared) =&gt; {
                             cx.unhandled_panic.set(<span class="bool-val">true</span>);
                             <span class="comment">// Safety: this is always called from the thread that owns `LocalSet`
                             </span><span class="kw">unsafe </span>{ cx.shared.local_state.close_and_shutdown_all(); }
                         }
                         <span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(<span class="string">&quot;runtime core not set in CURRENT thread-local&quot;</span>),
                     })
                 }
             }
         }
     }
 }

 <span class="kw">impl </span>LocalState {
     <span class="kw">unsafe fn </span>task_pop_front(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;task::Notified&lt;Arc&lt;Shared&gt;&gt;&gt; {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.local_queue.with_mut(|ptr| (<span class="kw-2">*</span>ptr).pop_front())
     }

     <span class="kw">unsafe fn </span>task_push_back(<span class="kw-2">&amp;</span><span class="self">self</span>, task: task::Notified&lt;Arc&lt;Shared&gt;&gt;) {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.local_queue.with_mut(|ptr| (<span class="kw-2">*</span>ptr).push_back(task))
     }

     <span class="kw">unsafe fn </span>take_local_queue(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; VecDeque&lt;task::Notified&lt;Arc&lt;Shared&gt;&gt;&gt; {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.local_queue.with_mut(|ptr| std::mem::take(<span class="kw-2">&amp;mut </span>(<span class="kw-2">*</span>ptr)))
     }

     <span class="kw">unsafe fn </span>task_remove(<span class="kw-2">&amp;</span><span class="self">self</span>, task: <span class="kw-2">&amp;</span>Task&lt;Arc&lt;Shared&gt;&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;Task&lt;Arc&lt;Shared&gt;&gt;&gt; {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.owned.remove(task)
     }

     <span class="doccomment">/// Returns true if the `LocalSet` does not have any spawned tasks
     </span><span class="kw">unsafe fn </span>owned_is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.owned.is_empty()
     }

     <span class="kw">unsafe fn </span>assert_owner(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         task: task::Notified&lt;Arc&lt;Shared&gt;&gt;,
     ) -&gt; task::LocalNotified&lt;Arc&lt;Shared&gt;&gt; {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.owned.assert_owner(task)
     }

     <span class="kw">unsafe fn </span>close_and_shutdown_all(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="comment">// The caller ensures it is called from the same thread that owns
         // the LocalSet.
         </span><span class="self">self</span>.assert_called_from_owner_thread();

         <span class="self">self</span>.owned.close_and_shutdown_all()
     }

     <span class="attribute">#[track_caller]
     </span><span class="kw">fn </span>assert_called_from_owner_thread(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="comment">// FreeBSD has some weirdness around thread-local destruction.
         // TODO: remove this hack when thread id is cleaned up
         </span><span class="attribute">#[cfg(not(any(target_os = <span class="string">&quot;openbsd&quot;</span>, target_os = <span class="string">&quot;freebsd&quot;</span>)))]
         </span><span class="macro">debug_assert!</span>(
             <span class="comment">// if we couldn&#39;t get the thread ID because we&#39;re dropping the local
             // data, skip the assertion --- the `Drop` impl is not going to be
             // called from another thread, because `LocalSet` is `!Send`
             </span>context::thread_id()
                 .map(|id| id == <span class="self">self</span>.owner)
                 .unwrap_or(<span class="bool-val">true</span>),
             <span class="string">&quot;`LocalSet`&#39;s local run queue must not be accessed by another thread!&quot;
         </span>);
     }
 }

 <span class="comment">// This is `Send` because it is stored in `Shared`. It is up to the caller to
 // ensure they are on the same thread that owns the `LocalSet`.
 </span><span class="kw">unsafe impl </span>Send <span class="kw">for </span>LocalState {}

 <span class="attribute">#[cfg(all(test, not(loom)))]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;

     <span class="comment">// Does a `LocalSet` running on a current-thread runtime...basically work?
     //
     // This duplicates a test in `tests/task_local_set.rs`, but because this is
     // a lib test, it wil run under Miri, so this is necessary to catch stacked
     // borrows violations in the `LocalSet` implementation.
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>local_current_thread_scheduler() {
         <span class="kw">let </span>f = <span class="kw">async </span>{
             LocalSet::new()
                 .run_until(<span class="kw">async </span>{
                     spawn_local(<span class="kw">async </span>{}).<span class="kw">await</span>.unwrap();
                 })
                 .<span class="kw">await</span>;
         };
         <span class="kw">crate</span>::runtime::Builder::new_current_thread()
             .build()
             .expect(<span class="string">&quot;rt&quot;</span>)
             .block_on(f)
     }

     <span class="comment">// Tests that when a task on a `LocalSet` is woken by an io driver on the
     // same thread, the task is woken to the localset&#39;s local queue rather than
     // its remote queue.
     //
     // This test has to be defined in the `local.rs` file as a lib test, rather
     // than in `tests/`, because it makes assertions about the local set&#39;s
     // internal state.
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>wakes_to_local_queue() {
         <span class="kw">use super</span>::<span class="kw-2">*</span>;
         <span class="kw">use </span><span class="kw">crate</span>::sync::Notify;
         <span class="kw">let </span>rt = <span class="kw">crate</span>::runtime::Builder::new_current_thread()
             .build()
             .expect(<span class="string">&quot;rt&quot;</span>);
         rt.block_on(<span class="kw">async </span>{
             <span class="kw">let </span>local = LocalSet::new();
             <span class="kw">let </span>notify = Arc::new(Notify::new());
             <span class="kw">let </span>task = local.spawn_local({
                 <span class="kw">let </span>notify = notify.clone();
                 <span class="kw">async move </span>{
                     notify.notified().<span class="kw">await</span>;
                 }
             });
             <span class="kw">let </span><span class="kw-2">mut </span>run_until = Box::pin(local.run_until(<span class="kw">async move </span>{
                 task.<span class="kw">await</span>.unwrap();
             }));

             <span class="comment">// poll the run until future once
             </span><span class="kw">crate</span>::future::poll_fn(|cx| {
                 <span class="kw">let _ </span>= run_until.as_mut().poll(cx);
                 Poll::Ready(())
             })
             .<span class="kw">await</span>;

             notify.notify_one();
             <span class="kw">let </span>task = <span class="kw">unsafe </span>{ local.context.shared.local_state.task_pop_front() };
             <span class="comment">// TODO(eliza): it would be nice to be able to assert that this is
             // the local task.
             </span><span class="macro">assert!</span>(
                 task.is_some(),
                 <span class="string">&quot;task should have been notified to the LocalSet&#39;s local queue&quot;
             </span>);
         })
     }
 }
 </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>