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 </pre><pre class="rust"><code><span class="doccomment">//! Multi-producer multi-consumer channels for message passing.
 //!
 //! This crate is an alternative to [`std::sync::mpsc`] with more features and better performance.
 //!
 //! # Hello, world!
 //!
 //! ```
 //! use crossbeam_channel::unbounded;
 //!
 //! // Create a channel of unbounded capacity.
 //! let (s, r) = unbounded();
 //!
 //! // Send a message into the channel.
 //! s.send(&quot;Hello, world!&quot;).unwrap();
 //!
 //! // Receive the message from the channel.
 //! assert_eq!(r.recv(), Ok(&quot;Hello, world!&quot;));
 //! ```
 //!
 //! # Channel types
 //!
 //! Channels can be created using two functions:
 //!
 //! * [`bounded`] creates a channel of bounded capacity, i.e. there is a limit to how many messages
 //!   it can hold at a time.
 //!
 //! * [`unbounded`] creates a channel of unbounded capacity, i.e. it can hold any number of
 //!   messages at a time.
 //!
 //! Both functions return a [`Sender`] and a [`Receiver`], which represent the two opposite sides
 //! of a channel.
 //!
 //! Creating a bounded channel:
 //!
 //! ```
 //! use crossbeam_channel::bounded;
 //!
 //! // Create a channel that can hold at most 5 messages at a time.
 //! let (s, r) = bounded(5);
 //!
 //! // Can send only 5 messages without blocking.
 //! for i in 0..5 {
 //!     s.send(i).unwrap();
 //! }
 //!
 //! // Another call to `send` would block because the channel is full.
 //! // s.send(5).unwrap();
 //! ```
 //!
 //! Creating an unbounded channel:
 //!
 //! ```
 //! use crossbeam_channel::unbounded;
 //!
 //! // Create an unbounded channel.
 //! let (s, r) = unbounded();
 //!
 //! // Can send any number of messages into the channel without blocking.
 //! for i in 0..1000 {
 //!     s.send(i).unwrap();
 //! }
 //! ```
 //!
 //! A special case is zero-capacity channel, which cannot hold any messages. Instead, send and
 //! receive operations must appear at the same time in order to pair up and pass the message over:
 //!
 //! ```
 //! use std::thread;
 //! use crossbeam_channel::bounded;
 //!
 //! // Create a zero-capacity channel.
 //! let (s, r) = bounded(0);
 //!
 //! // Sending blocks until a receive operation appears on the other side.
 //! thread::spawn(move || s.send(&quot;Hi!&quot;).unwrap());
 //!
 //! // Receiving blocks until a send operation appears on the other side.
 //! assert_eq!(r.recv(), Ok(&quot;Hi!&quot;));
 //! ```
 //!
 //! # Sharing channels
 //!
 //! Senders and receivers can be cloned and sent to other threads:
 //!
 //! ```
 //! use std::thread;
 //! use crossbeam_channel::bounded;
 //!
 //! let (s1, r1) = bounded(0);
 //! let (s2, r2) = (s1.clone(), r1.clone());
 //!
 //! // Spawn a thread that receives a message and then sends one.
 //! thread::spawn(move || {
 //!     r2.recv().unwrap();
 //!     s2.send(2).unwrap();
 //! });
 //!
 //! // Send a message and then receive one.
 //! s1.send(1).unwrap();
 //! r1.recv().unwrap();
 //! ```
 //!
 //! Note that cloning only creates a new handle to the same sending or receiving side. It does not
 //! create a separate stream of messages in any way:
 //!
 //! ```
 //! use crossbeam_channel::unbounded;
 //!
 //! let (s1, r1) = unbounded();
 //! let (s2, r2) = (s1.clone(), r1.clone());
 //! let (s3, r3) = (s2.clone(), r2.clone());
 //!
 //! s1.send(10).unwrap();
 //! s2.send(20).unwrap();
 //! s3.send(30).unwrap();
 //!
 //! assert_eq!(r3.recv(), Ok(10));
 //! assert_eq!(r1.recv(), Ok(20));
 //! assert_eq!(r2.recv(), Ok(30));
 //! ```
 //!
 //! It&#39;s also possible to share senders and receivers by reference:
 //!
 //! ```
 //! use crossbeam_channel::bounded;
 //! use crossbeam_utils::thread::scope;
 //!
 //! let (s, r) = bounded(0);
 //!
 //! scope(|scope| {
 //!     // Spawn a thread that receives a message and then sends one.
 //!     scope.spawn(|_| {
 //!         r.recv().unwrap();
 //!         s.send(2).unwrap();
 //!     });
 //!
 //!     // Send a message and then receive one.
 //!     s.send(1).unwrap();
 //!     r.recv().unwrap();
 //! }).unwrap();
 //! ```
 //!
 //! # Disconnection
 //!
 //! When all senders or all receivers associated with a channel get dropped, the channel becomes
 //! disconnected. No more messages can be sent, but any remaining messages can still be received.
 //! Send and receive operations on a disconnected channel never block.
 //!
 //! ```
 //! use crossbeam_channel::{unbounded, RecvError};
 //!
 //! let (s, r) = unbounded();
 //! s.send(1).unwrap();
 //! s.send(2).unwrap();
 //! s.send(3).unwrap();
 //!
 //! // The only sender is dropped, disconnecting the channel.
 //! drop(s);
 //!
 //! // The remaining messages can be received.
 //! assert_eq!(r.recv(), Ok(1));
 //! assert_eq!(r.recv(), Ok(2));
 //! assert_eq!(r.recv(), Ok(3));
 //!
 //! // There are no more messages in the channel.
 //! assert!(r.is_empty());
 //!
 //! // Note that calling `r.recv()` does not block.
 //! // Instead, `Err(RecvError)` is returned immediately.
 //! assert_eq!(r.recv(), Err(RecvError));
 //! ```
 //!
 //! # Blocking operations
 //!
 //! Send and receive operations come in three flavors:
 //!
 //! * Non-blocking (returns immediately with success or failure).
 //! * Blocking (waits until the operation succeeds or the channel becomes disconnected).
 //! * Blocking with a timeout (blocks only for a certain duration of time).
 //!
 //! A simple example showing the difference between non-blocking and blocking operations:
 //!
 //! ```
 //! use crossbeam_channel::{bounded, RecvError, TryRecvError};
 //!
 //! let (s, r) = bounded(1);
 //!
 //! // Send a message into the channel.
 //! s.send(&quot;foo&quot;).unwrap();
 //!
 //! // This call would block because the channel is full.
 //! // s.send(&quot;bar&quot;).unwrap();
 //!
 //! // Receive the message.
 //! assert_eq!(r.recv(), Ok(&quot;foo&quot;));
 //!
 //! // This call would block because the channel is empty.
 //! // r.recv();
 //!
 //! // Try receiving a message without blocking.
 //! assert_eq!(r.try_recv(), Err(TryRecvError::Empty));
 //!
 //! // Disconnect the channel.
 //! drop(s);
 //!
 //! // This call doesn&#39;t block because the channel is now disconnected.
 //! assert_eq!(r.recv(), Err(RecvError));
 //! ```
 //!
 //! # Iteration
 //!
 //! Receivers can be used as iterators. For example, method [`iter`] creates an iterator that
 //! receives messages until the channel becomes empty and disconnected. Note that iteration may
 //! block waiting for next message to arrive.
 //!
 //! ```
 //! use std::thread;
 //! use crossbeam_channel::unbounded;
 //!
 //! let (s, r) = unbounded();
 //!
 //! thread::spawn(move || {
 //!     s.send(1).unwrap();
 //!     s.send(2).unwrap();
 //!     s.send(3).unwrap();
 //!     drop(s); // Disconnect the channel.
 //! });
 //!
 //! // Collect all messages from the channel.
 //! // Note that the call to `collect` blocks until the sender is dropped.
 //! let v: Vec&lt;_&gt; = r.iter().collect();
 //!
 //! assert_eq!(v, [1, 2, 3]);
 //! ```
 //!
 //! A non-blocking iterator can be created using [`try_iter`], which receives all available
 //! messages without blocking:
 //!
 //! ```
 //! use crossbeam_channel::unbounded;
 //!
 //! let (s, r) = unbounded();
 //! s.send(1).unwrap();
 //! s.send(2).unwrap();
 //! s.send(3).unwrap();
 //! // No need to drop the sender.
 //!
 //! // Receive all messages currently in the channel.
 //! let v: Vec&lt;_&gt; = r.try_iter().collect();
 //!
 //! assert_eq!(v, [1, 2, 3]);
 //! ```
 //!
 //! # Selection
 //!
 //! The [`select!`] macro allows you to define a set of channel operations, wait until any one of
 //! them becomes ready, and finally execute it. If multiple operations are ready at the same time,
 //! a random one among them is selected.
 //!
 //! It is also possible to define a `default` case that gets executed if none of the operations are
 //! ready, either right away or for a certain duration of time.
 //!
 //! An operation is considered to be ready if it doesn&#39;t have to block. Note that it is ready even
 //! when it will simply return an error because the channel is disconnected.
 //!
 //! An example of receiving a message from two channels:
 //!
 //! ```
 //! use std::thread;
 //! use std::time::Duration;
 //! use crossbeam_channel::{select, unbounded};
 //!
 //! let (s1, r1) = unbounded();
 //! let (s2, r2) = unbounded();
 //!
 //! thread::spawn(move || s1.send(10).unwrap());
 //! thread::spawn(move || s2.send(20).unwrap());
 //!
 //! // At most one of these two receive operations will be executed.
 //! select! {
 //!     recv(r1) -&gt; msg =&gt; assert_eq!(msg, Ok(10)),
 //!     recv(r2) -&gt; msg =&gt; assert_eq!(msg, Ok(20)),
 //!     default(Duration::from_secs(1)) =&gt; println!(&quot;timed out&quot;),
 //! }
 //! ```
 //!
 //! If you need to select over a dynamically created list of channel operations, use [`Select`]
 //! instead. The [`select!`] macro is just a convenience wrapper around [`Select`].
 //!
 //! # Extra channels
 //!
 //! Three functions can create special kinds of channels, all of which return just a [`Receiver`]
 //! handle:
 //!
 //! * [`after`] creates a channel that delivers a single message after a certain duration of time.
 //! * [`tick`] creates a channel that delivers messages periodically.
 //! * [`never`](never()) creates a channel that never delivers messages.
 //!
 //! These channels are very efficient because messages get lazily generated on receive operations.
 //!
 //! An example that prints elapsed time every 50 milliseconds for the duration of 1 second:
 //!
 //! ```
 //! use std::time::{Duration, Instant};
 //! use crossbeam_channel::{after, select, tick};
 //!
 //! let start = Instant::now();
 //! let ticker = tick(Duration::from_millis(50));
 //! let timeout = after(Duration::from_secs(1));
 //!
 //! loop {
 //!     select! {
 //!         recv(ticker) -&gt; _ =&gt; println!(&quot;elapsed: {:?}&quot;, start.elapsed()),
 //!         recv(timeout) -&gt; _ =&gt; break,
 //!     }
 //! }
 //! ```
 //!
 //! [`send`]: Sender::send
 //! [`recv`]: Receiver::recv
 //! [`iter`]: Receiver::iter
 //! [`try_iter`]: Receiver::try_iter

 </span><span class="attribute">#![doc(test(
     no_crate_inject,
     attr(
         deny(warnings, rust_2018_idioms),
         allow(dead_code, unused_assignments, unused_variables)
     )
 ))]
 #![warn(
     missing_docs,
     missing_debug_implementations,
     rust_2018_idioms,
     unreachable_pub
 )]
 #![cfg_attr(not(feature = <span class="string">&quot;std&quot;</span>), no_std)]

 </span><span class="kw">use </span>cfg_if::cfg_if;

 <span class="macro">cfg_if! </span>{
     <span class="kw">if </span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)] </span>{
         <span class="kw">mod </span>channel;
         <span class="kw">mod </span>context;
         <span class="kw">mod </span>counter;
         <span class="kw">mod </span>err;
         <span class="kw">mod </span>flavors;
         <span class="kw">mod </span>select;
         <span class="kw">mod </span>select_macro;
         <span class="kw">mod </span>utils;
         <span class="kw">mod </span>waker;

         <span class="doccomment">/// Crate internals used by the `select!` macro.
         </span><span class="attribute">#[doc(hidden)]
         </span><span class="kw">pub mod </span>internal {
             <span class="kw">pub use </span><span class="kw">crate</span>::select::SelectHandle;
             <span class="kw">pub use </span><span class="kw">crate</span>::select::{select, select_timeout, try_select};
         }

         <span class="kw">pub use </span><span class="kw">crate</span>::channel::{after, at, never, tick};
         <span class="kw">pub use </span><span class="kw">crate</span>::channel::{bounded, unbounded};
         <span class="kw">pub use </span><span class="kw">crate</span>::channel::{IntoIter, Iter, TryIter};
         <span class="kw">pub use </span><span class="kw">crate</span>::channel::{Receiver, Sender};

         <span class="kw">pub use </span><span class="kw">crate</span>::select::{Select, SelectedOperation};

         <span class="kw">pub use </span><span class="kw">crate</span>::err::{ReadyTimeoutError, SelectTimeoutError, TryReadyError, TrySelectError};
         <span class="kw">pub use </span><span class="kw">crate</span>::err::{RecvError, RecvTimeoutError, TryRecvError};
         <span class="kw">pub use </span><span class="kw">crate</span>::err::{SendError, SendTimeoutError, TrySendError};
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="crossbeam_channel" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>