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 </pre><pre class="rust"><code><span class="doccomment">//! Interface to the select mechanism.

 </span><span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::marker::PhantomData;
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::time::{Duration, Instant};

 <span class="kw">use </span>crossbeam_utils::Backoff;

 <span class="kw">use </span><span class="kw">crate</span>::channel::{<span class="self">self</span>, Receiver, Sender};
 <span class="kw">use </span><span class="kw">crate</span>::context::Context;
 <span class="kw">use </span><span class="kw">crate</span>::err::{ReadyTimeoutError, TryReadyError};
 <span class="kw">use </span><span class="kw">crate</span>::err::{RecvError, SendError};
 <span class="kw">use </span><span class="kw">crate</span>::err::{SelectTimeoutError, TrySelectError};
 <span class="kw">use </span><span class="kw">crate</span>::flavors;
 <span class="kw">use </span><span class="kw">crate</span>::utils;

 <span class="doccomment">/// Temporary data that gets initialized during select or a blocking operation, and is consumed by
 /// `read` or `write`.
 ///
 /// Each field contains data associated with a specific channel flavor.
 </span><span class="comment">// This is a private API that is used by the select macro.
 </span><span class="attribute">#[derive(Debug, Default)]
 </span><span class="kw">pub struct </span>Token {
     <span class="kw">pub</span>(<span class="kw">crate</span>) at: flavors::at::AtToken,
     <span class="kw">pub</span>(<span class="kw">crate</span>) array: flavors::array::ArrayToken,
     <span class="kw">pub</span>(<span class="kw">crate</span>) list: flavors::list::ListToken,
     <span class="attribute">#[allow(dead_code)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) never: flavors::never::NeverToken,
     <span class="kw">pub</span>(<span class="kw">crate</span>) tick: flavors::tick::TickToken,
     <span class="kw">pub</span>(<span class="kw">crate</span>) zero: flavors::zero::ZeroToken,
 }

 <span class="doccomment">/// Identifier associated with an operation by a specific thread on a specific channel.
 </span><span class="attribute">#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 </span><span class="kw">pub struct </span>Operation(usize);

 <span class="kw">impl </span>Operation {
     <span class="doccomment">/// Creates an operation identifier from a mutable reference.
     ///
     /// This function essentially just turns the address of the reference into a number. The
     /// reference should point to a variable that is specific to the thread and the operation,
     /// and is alive for the entire duration of select or blocking operation.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>hook&lt;T&gt;(r: <span class="kw-2">&amp;mut </span>T) -&gt; Operation {
         <span class="kw">let </span>val = r <span class="kw">as </span><span class="kw-2">*mut </span>T <span class="kw">as </span>usize;
         <span class="comment">// Make sure that the pointer address doesn&#39;t equal the numerical representation of
         // `Selected::{Waiting, Aborted, Disconnected}`.
         </span><span class="macro">assert!</span>(val &gt; <span class="number">2</span>);
         Operation(val)
     }
 }

 <span class="doccomment">/// Current state of a select or a blocking operation.
 </span><span class="attribute">#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 </span><span class="kw">pub enum </span>Selected {
     <span class="doccomment">/// Still waiting for an operation.
     </span>Waiting,

     <span class="doccomment">/// The attempt to block the current thread has been aborted.
     </span>Aborted,

     <span class="doccomment">/// An operation became ready because a channel is disconnected.
     </span>Disconnected,

     <span class="doccomment">/// An operation became ready because a message can be sent or received.
     </span>Operation(Operation),
 }

 <span class="kw">impl </span>From&lt;usize&gt; <span class="kw">for </span>Selected {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from(val: usize) -&gt; Selected {
         <span class="kw">match </span>val {
             <span class="number">0 </span>=&gt; Selected::Waiting,
             <span class="number">1 </span>=&gt; Selected::Aborted,
             <span class="number">2 </span>=&gt; Selected::Disconnected,
             oper =&gt; Selected::Operation(Operation(oper)),
         }
     }
 }

 <span class="kw">impl </span>Into&lt;usize&gt; <span class="kw">for </span>Selected {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>into(<span class="self">self</span>) -&gt; usize {
         <span class="kw">match </span><span class="self">self </span>{
             Selected::Waiting =&gt; <span class="number">0</span>,
             Selected::Aborted =&gt; <span class="number">1</span>,
             Selected::Disconnected =&gt; <span class="number">2</span>,
             Selected::Operation(Operation(val)) =&gt; val,
         }
     }
 }

 <span class="doccomment">/// A receiver or a sender that can participate in select.
 ///
 /// This is a handle that assists select in executing an operation, registration, deciding on the
 /// appropriate deadline for blocking, etc.
 </span><span class="comment">// This is a private API (exposed inside crossbeam_channel::internal module) that is used by the select macro.
 </span><span class="kw">pub trait </span>SelectHandle {
     <span class="doccomment">/// Attempts to select an operation and returns `true` on success.
     </span><span class="kw">fn </span>try_select(<span class="kw-2">&amp;</span><span class="self">self</span>, token: <span class="kw-2">&amp;mut </span>Token) -&gt; bool;

     <span class="doccomment">/// Returns a deadline for an operation, if there is one.
     </span><span class="kw">fn </span>deadline(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Instant&gt;;

     <span class="doccomment">/// Registers an operation for execution and returns `true` if it is now ready.
     </span><span class="kw">fn </span>register(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool;

     <span class="doccomment">/// Unregisters an operation for execution.
     </span><span class="kw">fn </span>unregister(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation);

     <span class="doccomment">/// Attempts to select an operation the thread got woken up for and returns `true` on success.
     </span><span class="kw">fn </span>accept(<span class="kw-2">&amp;</span><span class="self">self</span>, token: <span class="kw-2">&amp;mut </span>Token, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool;

     <span class="doccomment">/// Returns `true` if an operation can be executed without blocking.
     </span><span class="kw">fn </span>is_ready(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool;

     <span class="doccomment">/// Registers an operation for readiness notification and returns `true` if it is now ready.
     </span><span class="kw">fn </span>watch(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool;

     <span class="doccomment">/// Unregisters an operation for readiness notification.
     </span><span class="kw">fn </span>unwatch(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation);
 }

 <span class="kw">impl</span>&lt;T: SelectHandle&gt; SelectHandle <span class="kw">for </span><span class="kw-2">&amp;</span>T {
     <span class="kw">fn </span>try_select(<span class="kw-2">&amp;</span><span class="self">self</span>, token: <span class="kw-2">&amp;mut </span>Token) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).try_select(token)
     }

     <span class="kw">fn </span>deadline(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Instant&gt; {
         (<span class="kw-2">**</span><span class="self">self</span>).deadline()
     }

     <span class="kw">fn </span>register(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).register(oper, cx)
     }

     <span class="kw">fn </span>unregister(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation) {
         (<span class="kw-2">**</span><span class="self">self</span>).unregister(oper);
     }

     <span class="kw">fn </span>accept(<span class="kw-2">&amp;</span><span class="self">self</span>, token: <span class="kw-2">&amp;mut </span>Token, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).accept(token, cx)
     }

     <span class="kw">fn </span>is_ready(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).is_ready()
     }

     <span class="kw">fn </span>watch(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation, cx: <span class="kw-2">&amp;</span>Context) -&gt; bool {
         (<span class="kw-2">**</span><span class="self">self</span>).watch(oper, cx)
     }

     <span class="kw">fn </span>unwatch(<span class="kw-2">&amp;</span><span class="self">self</span>, oper: Operation) {
         (<span class="kw-2">**</span><span class="self">self</span>).unwatch(oper)
     }
 }

 <span class="doccomment">/// Determines when a select operation should time out.
 </span><span class="attribute">#[derive(Clone, Copy, Eq, PartialEq)]
 </span><span class="kw">enum </span>Timeout {
     <span class="doccomment">/// No blocking.
     </span>Now,

     <span class="doccomment">/// Block forever.
     </span>Never,

     <span class="doccomment">/// Time out after the time instant.
     </span>At(Instant),
 }

 <span class="doccomment">/// Runs until one of the operations is selected, potentially blocking the current thread.
 ///
 /// Successful receive operations will have to be followed up by `channel::read()` and successful
 /// send operations by `channel::write()`.
 </span><span class="kw">fn </span>run_select(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
     timeout: Timeout,
 ) -&gt; <span class="prelude-ty">Option</span>&lt;(Token, usize, <span class="kw-2">*const </span>u8)&gt; {
     <span class="kw">if </span>handles.is_empty() {
         <span class="comment">// Wait until the timeout and return.
         </span><span class="kw">match </span>timeout {
             Timeout::Now =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
             Timeout::Never =&gt; {
                 utils::sleep_until(<span class="prelude-val">None</span>);
                 <span class="macro">unreachable!</span>();
             }
             Timeout::At(when) =&gt; {
                 utils::sleep_until(<span class="prelude-val">Some</span>(when));
                 <span class="kw">return </span><span class="prelude-val">None</span>;
             }
         }
     }

     <span class="comment">// Shuffle the operations for fairness.
     </span>utils::shuffle(handles);

     <span class="comment">// Create a token, which serves as a temporary variable that gets initialized in this function
     // and is later used by a call to `channel::read()` or `channel::write()` that completes the
     // selected operation.
     </span><span class="kw">let </span><span class="kw-2">mut </span>token = Token::default();

     <span class="comment">// Try selecting one of the operations without blocking.
     </span><span class="kw">for </span><span class="kw-2">&amp;</span>(handle, i, ptr) <span class="kw">in </span>handles.iter() {
         <span class="kw">if </span>handle.try_select(<span class="kw-2">&amp;mut </span>token) {
             <span class="kw">return </span><span class="prelude-val">Some</span>((token, i, ptr));
         }
     }

     <span class="kw">loop </span>{
         <span class="comment">// Prepare for blocking.
         </span><span class="kw">let </span>res = Context::with(|cx| {
             <span class="kw">let </span><span class="kw-2">mut </span>sel = Selected::Waiting;
             <span class="kw">let </span><span class="kw-2">mut </span>registered_count = <span class="number">0</span>;
             <span class="kw">let </span><span class="kw-2">mut </span>index_ready = <span class="prelude-val">None</span>;

             <span class="kw">if let </span>Timeout::Now = timeout {
                 cx.try_select(Selected::Aborted).unwrap();
             }

             <span class="comment">// Register all operations.
             </span><span class="kw">for </span>(handle, i, <span class="kw">_</span>) <span class="kw">in </span>handles.iter_mut() {
                 registered_count += <span class="number">1</span>;

                 <span class="comment">// If registration returns `false`, that means the operation has just become ready.
                 </span><span class="kw">if </span>handle.register(Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle), cx) {
                     <span class="comment">// Try aborting select.
                     </span>sel = <span class="kw">match </span>cx.try_select(Selected::Aborted) {
                         <span class="prelude-val">Ok</span>(()) =&gt; {
                             index_ready = <span class="prelude-val">Some</span>(<span class="kw-2">*</span>i);
                             Selected::Aborted
                         }
                         <span class="prelude-val">Err</span>(s) =&gt; s,
                     };
                     <span class="kw">break</span>;
                 }

                 <span class="comment">// If another thread has already selected one of the operations, stop registration.
                 </span>sel = cx.selected();
                 <span class="kw">if </span>sel != Selected::Waiting {
                     <span class="kw">break</span>;
                 }
             }

             <span class="kw">if </span>sel == Selected::Waiting {
                 <span class="comment">// Check with each operation for how long we&#39;re allowed to block, and compute the
                 // earliest deadline.
                 </span><span class="kw">let </span><span class="kw-2">mut </span>deadline: <span class="prelude-ty">Option</span>&lt;Instant&gt; = <span class="kw">match </span>timeout {
                     Timeout::Now =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
                     Timeout::Never =&gt; <span class="prelude-val">None</span>,
                     Timeout::At(when) =&gt; <span class="prelude-val">Some</span>(when),
                 };
                 <span class="kw">for </span><span class="kw-2">&amp;</span>(handle, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in </span>handles.iter() {
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(x) = handle.deadline() {
                         deadline = deadline.map(|y| x.min(y)).or(<span class="prelude-val">Some</span>(x));
                     }
                 }

                 <span class="comment">// Block the current thread.
                 </span>sel = cx.wait_until(deadline);
             }

             <span class="comment">// Unregister all registered operations.
             </span><span class="kw">for </span>(handle, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in </span>handles.iter_mut().take(registered_count) {
                 handle.unregister(Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle));
             }

             <span class="kw">match </span>sel {
                 Selected::Waiting =&gt; <span class="macro">unreachable!</span>(),
                 Selected::Aborted =&gt; {
                     <span class="comment">// If an operation became ready during registration, try selecting it.
                     </span><span class="kw">if let </span><span class="prelude-val">Some</span>(index_ready) = index_ready {
                         <span class="kw">for </span><span class="kw-2">&amp;</span>(handle, i, ptr) <span class="kw">in </span>handles.iter() {
                             <span class="kw">if </span>i == index_ready &amp;&amp; handle.try_select(<span class="kw-2">&amp;mut </span>token) {
                                 <span class="kw">return </span><span class="prelude-val">Some</span>((i, ptr));
                             }
                         }
                     }
                 }
                 Selected::Disconnected =&gt; {}
                 Selected::Operation(<span class="kw">_</span>) =&gt; {
                     <span class="comment">// Find the selected operation.
                     </span><span class="kw">for </span>(handle, i, ptr) <span class="kw">in </span>handles.iter_mut() {
                         <span class="comment">// Is this the selected operation?
                         </span><span class="kw">if </span>sel == Selected::Operation(Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle))
                         {
                             <span class="comment">// Try selecting this operation.
                             </span><span class="kw">if </span>handle.accept(<span class="kw-2">&amp;mut </span>token, cx) {
                                 <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">*</span>i, <span class="kw-2">*</span>ptr));
                             }
                         }
                     }
                 }
             }

             <span class="prelude-val">None
         </span>});

         <span class="comment">// Return if an operation was selected.
         </span><span class="kw">if let </span><span class="prelude-val">Some</span>((i, ptr)) = res {
             <span class="kw">return </span><span class="prelude-val">Some</span>((token, i, ptr));
         }

         <span class="comment">// Try selecting one of the operations without blocking.
         </span><span class="kw">for </span><span class="kw-2">&amp;</span>(handle, i, ptr) <span class="kw">in </span>handles.iter() {
             <span class="kw">if </span>handle.try_select(<span class="kw-2">&amp;mut </span>token) {
                 <span class="kw">return </span><span class="prelude-val">Some</span>((token, i, ptr));
             }
         }

         <span class="kw">match </span>timeout {
             Timeout::Now =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
             Timeout::Never =&gt; {}
             Timeout::At(when) =&gt; {
                 <span class="kw">if </span>Instant::now() &gt;= when {
                     <span class="kw">return </span><span class="prelude-val">None</span>;
                 }
             }
         }
     }
 }

 <span class="doccomment">/// Runs until one of the operations becomes ready, potentially blocking the current thread.
 </span><span class="kw">fn </span>run_ready(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
     timeout: Timeout,
 ) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
     <span class="kw">if </span>handles.is_empty() {
         <span class="comment">// Wait until the timeout and return.
         </span><span class="kw">match </span>timeout {
             Timeout::Now =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
             Timeout::Never =&gt; {
                 utils::sleep_until(<span class="prelude-val">None</span>);
                 <span class="macro">unreachable!</span>();
             }
             Timeout::At(when) =&gt; {
                 utils::sleep_until(<span class="prelude-val">Some</span>(when));
                 <span class="kw">return </span><span class="prelude-val">None</span>;
             }
         }
     }

     <span class="comment">// Shuffle the operations for fairness.
     </span>utils::shuffle(handles);

     <span class="kw">loop </span>{
         <span class="kw">let </span>backoff = Backoff::new();
         <span class="kw">loop </span>{
             <span class="comment">// Check operations for readiness.
             </span><span class="kw">for </span><span class="kw-2">&amp;</span>(handle, i, <span class="kw">_</span>) <span class="kw">in </span>handles.iter() {
                 <span class="kw">if </span>handle.is_ready() {
                     <span class="kw">return </span><span class="prelude-val">Some</span>(i);
                 }
             }

             <span class="kw">if </span>backoff.is_completed() {
                 <span class="kw">break</span>;
             } <span class="kw">else </span>{
                 backoff.snooze();
             }
         }

         <span class="comment">// Check for timeout.
         </span><span class="kw">match </span>timeout {
             Timeout::Now =&gt; <span class="kw">return </span><span class="prelude-val">None</span>,
             Timeout::Never =&gt; {}
             Timeout::At(when) =&gt; {
                 <span class="kw">if </span>Instant::now() &gt;= when {
                     <span class="kw">return </span><span class="prelude-val">None</span>;
                 }
             }
         }

         <span class="comment">// Prepare for blocking.
         </span><span class="kw">let </span>res = Context::with(|cx| {
             <span class="kw">let </span><span class="kw-2">mut </span>sel = Selected::Waiting;
             <span class="kw">let </span><span class="kw-2">mut </span>registered_count = <span class="number">0</span>;

             <span class="comment">// Begin watching all operations.
             </span><span class="kw">for </span>(handle, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in </span>handles.iter_mut() {
                 registered_count += <span class="number">1</span>;
                 <span class="kw">let </span>oper = Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle);

                 <span class="comment">// If registration returns `false`, that means the operation has just become ready.
                 </span><span class="kw">if </span>handle.watch(oper, cx) {
                     sel = <span class="kw">match </span>cx.try_select(Selected::Operation(oper)) {
                         <span class="prelude-val">Ok</span>(()) =&gt; Selected::Operation(oper),
                         <span class="prelude-val">Err</span>(s) =&gt; s,
                     };
                     <span class="kw">break</span>;
                 }

                 <span class="comment">// If another thread has already chosen one of the operations, stop registration.
                 </span>sel = cx.selected();
                 <span class="kw">if </span>sel != Selected::Waiting {
                     <span class="kw">break</span>;
                 }
             }

             <span class="kw">if </span>sel == Selected::Waiting {
                 <span class="comment">// Check with each operation for how long we&#39;re allowed to block, and compute the
                 // earliest deadline.
                 </span><span class="kw">let </span><span class="kw-2">mut </span>deadline: <span class="prelude-ty">Option</span>&lt;Instant&gt; = <span class="kw">match </span>timeout {
                     Timeout::Now =&gt; <span class="macro">unreachable!</span>(),
                     Timeout::Never =&gt; <span class="prelude-val">None</span>,
                     Timeout::At(when) =&gt; <span class="prelude-val">Some</span>(when),
                 };
                 <span class="kw">for </span><span class="kw-2">&amp;</span>(handle, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in </span>handles.iter() {
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(x) = handle.deadline() {
                         deadline = deadline.map(|y| x.min(y)).or(<span class="prelude-val">Some</span>(x));
                     }
                 }

                 <span class="comment">// Block the current thread.
                 </span>sel = cx.wait_until(deadline);
             }

             <span class="comment">// Unwatch all operations.
             </span><span class="kw">for </span>(handle, <span class="kw">_</span>, <span class="kw">_</span>) <span class="kw">in </span>handles.iter_mut().take(registered_count) {
                 handle.unwatch(Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle));
             }

             <span class="kw">match </span>sel {
                 Selected::Waiting =&gt; <span class="macro">unreachable!</span>(),
                 Selected::Aborted =&gt; {}
                 Selected::Disconnected =&gt; {}
                 Selected::Operation(<span class="kw">_</span>) =&gt; {
                     <span class="kw">for </span>(handle, i, <span class="kw">_</span>) <span class="kw">in </span>handles.iter_mut() {
                         <span class="kw">let </span>oper = Operation::hook::&lt;<span class="kw-2">&amp;</span><span class="kw">dyn </span>SelectHandle&gt;(handle);
                         <span class="kw">if </span>sel == Selected::Operation(oper) {
                             <span class="kw">return </span><span class="prelude-val">Some</span>(<span class="kw-2">*</span>i);
                         }
                     }
                 }
             }

             <span class="prelude-val">None
         </span>});

         <span class="comment">// Return if an operation became ready.
         </span><span class="kw">if </span>res.is_some() {
             <span class="kw">return </span>res;
         }
     }
 }

 <span class="doccomment">/// Attempts to select one of the operations without blocking.
 </span><span class="comment">// This is a private API (exposed inside crossbeam_channel::internal module) that is used by the select macro.
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub fn </span>try_select&lt;<span class="lifetime">&#39;a</span>&gt;(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
 ) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, TrySelectError&gt; {
     <span class="kw">match </span>run_select(handles, Timeout::Now) {
         <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(TrySelectError),
         <span class="prelude-val">Some</span>((token, index, ptr)) =&gt; <span class="prelude-val">Ok</span>(SelectedOperation {
             token,
             index,
             ptr,
             _marker: PhantomData,
         }),
     }
 }

 <span class="doccomment">/// Blocks until one of the operations becomes ready and selects it.
 </span><span class="comment">// This is a private API (exposed inside crossbeam_channel::internal module) that is used by the select macro.
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub fn </span>select&lt;<span class="lifetime">&#39;a</span>&gt;(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
 ) -&gt; SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">if </span>handles.is_empty() {
         <span class="macro">panic!</span>(<span class="string">&quot;no operations have been added to `Select`&quot;</span>);
     }

     <span class="kw">let </span>(token, index, ptr) = run_select(handles, Timeout::Never).unwrap();
     SelectedOperation {
         token,
         index,
         ptr,
         _marker: PhantomData,
     }
 }

 <span class="doccomment">/// Blocks for a limited time until one of the operations becomes ready and selects it.
 </span><span class="comment">// This is a private API (exposed inside crossbeam_channel::internal module) that is used by the select macro.
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub fn </span>select_timeout&lt;<span class="lifetime">&#39;a</span>&gt;(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
     timeout: Duration,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, SelectTimeoutError&gt; {
     <span class="kw">match </span>Instant::now().checked_add(timeout) {
         <span class="prelude-val">Some</span>(deadline) =&gt; select_deadline(handles, deadline),
         <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(select(handles)),
     }
 }

 <span class="doccomment">/// Blocks until a given deadline, or until one of the operations becomes ready and selects it.
 </span><span class="attribute">#[inline]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>select_deadline&lt;<span class="lifetime">&#39;a</span>&gt;(
     handles: <span class="kw-2">&amp;mut </span>[(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)],
     deadline: Instant,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, SelectTimeoutError&gt; {
     <span class="kw">match </span>run_select(handles, Timeout::At(deadline)) {
         <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(SelectTimeoutError),
         <span class="prelude-val">Some</span>((token, index, ptr)) =&gt; <span class="prelude-val">Ok</span>(SelectedOperation {
             token,
             index,
             ptr,
             _marker: PhantomData,
         }),
     }
 }

 <span class="doccomment">/// Selects from a set of channel operations.
 ///
 /// `Select` 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.
 ///
 /// 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.
 ///
 /// The [`select!`] macro is a convenience wrapper around `Select`. However, it cannot select over a
 /// dynamically created list of channel operations.
 ///
 /// [`select!`]: crate::select!
 ///
 /// Once a list of operations has been built with `Select`, there are two different ways of
 /// proceeding:
 ///
 /// * Select an operation with [`try_select`], [`select`], or [`select_timeout`]. If successful,
 ///   the returned selected operation has already begun and **must** be completed. If we don&#39;t
 ///   complete it, a panic will occur.
 ///
 /// * Wait for an operation to become ready with [`try_ready`], [`ready`], or [`ready_timeout`]. If
 ///   successful, we may attempt to execute the operation, but are not obliged to. In fact, it&#39;s
 ///   possible for another thread to make the operation not ready just before we try executing it,
 ///   so it&#39;s wise to use a retry loop. However, note that these methods might return with success
 ///   spuriously, so it&#39;s a good idea to always double check if the operation is really ready.
 ///
 /// # Examples
 ///
 /// Use [`select`] to receive a message from a list of receivers:
 ///
 /// ```
 /// use crossbeam_channel::{Receiver, RecvError, Select};
 ///
 /// fn recv_multiple&lt;T&gt;(rs: &amp;[Receiver&lt;T&gt;]) -&gt; Result&lt;T, RecvError&gt; {
 ///     // Build a list of operations.
 ///     let mut sel = Select::new();
 ///     for r in rs {
 ///         sel.recv(r);
 ///     }
 ///
 ///     // Complete the selected operation.
 ///     let oper = sel.select();
 ///     let index = oper.index();
 ///     oper.recv(&amp;rs[index])
 /// }
 /// ```
 ///
 /// Use [`ready`] to receive a message from a list of receivers:
 ///
 /// ```
 /// use crossbeam_channel::{Receiver, RecvError, Select};
 ///
 /// fn recv_multiple&lt;T&gt;(rs: &amp;[Receiver&lt;T&gt;]) -&gt; Result&lt;T, RecvError&gt; {
 ///     // Build a list of operations.
 ///     let mut sel = Select::new();
 ///     for r in rs {
 ///         sel.recv(r);
 ///     }
 ///
 ///     loop {
 ///         // Wait until a receive operation becomes ready and try executing it.
 ///         let index = sel.ready();
 ///         let res = rs[index].try_recv();
 ///
 ///         // If the operation turns out not to be ready, retry.
 ///         if let Err(e) = res {
 ///             if e.is_empty() {
 ///                 continue;
 ///             }
 ///         }
 ///
 ///         // Success!
 ///         return res.map_err(|_| RecvError);
 ///     }
 /// }
 /// ```
 ///
 /// [`try_select`]: Select::try_select
 /// [`select`]: Select::select
 /// [`select_timeout`]: Select::select_timeout
 /// [`try_ready`]: Select::try_ready
 /// [`ready`]: Select::ready
 /// [`ready_timeout`]: Select::ready_timeout
 </span><span class="kw">pub struct </span>Select&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// A list of senders and receivers participating in selection.
     </span>handles: Vec&lt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw">dyn </span>SelectHandle, usize, <span class="kw-2">*const </span>u8)&gt;,

     <span class="doccomment">/// The next index to assign to an operation.
     </span>next_index: usize,
 }

 <span class="kw">unsafe impl </span>Send <span class="kw">for </span>Select&lt;<span class="lifetime">&#39;_</span>&gt; {}
 <span class="kw">unsafe impl </span>Sync <span class="kw">for </span>Select&lt;<span class="lifetime">&#39;_</span>&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Select&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Creates an empty list of channel operations for selection.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::Select;
     ///
     /// let mut sel = Select::new();
     ///
     /// // The list of operations is empty, which means no operation can be selected.
     /// assert!(sel.try_select().is_err());
     /// ```
     </span><span class="kw">pub fn </span>new() -&gt; Select&lt;<span class="lifetime">&#39;a</span>&gt; {
         Select {
             handles: Vec::with_capacity(<span class="number">4</span>),
             next_index: <span class="number">0</span>,
         }
     }

     <span class="doccomment">/// Adds a send operation.
     ///
     /// Returns the index of the added operation.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s, r) = unbounded::&lt;i32&gt;();
     ///
     /// let mut sel = Select::new();
     /// let index = sel.send(&amp;s);
     /// ```
     </span><span class="kw">pub fn </span>send&lt;T&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Sender&lt;T&gt;) -&gt; usize {
         <span class="kw">let </span>i = <span class="self">self</span>.next_index;
         <span class="kw">let </span>ptr = s <span class="kw">as </span><span class="kw-2">*const </span>Sender&lt;<span class="kw">_</span>&gt; <span class="kw">as </span><span class="kw-2">*const </span>u8;
         <span class="self">self</span>.handles.push((s, i, ptr));
         <span class="self">self</span>.next_index += <span class="number">1</span>;
         i
     }

     <span class="doccomment">/// Adds a receive operation.
     ///
     /// Returns the index of the added operation.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s, r) = unbounded::&lt;i32&gt;();
     ///
     /// let mut sel = Select::new();
     /// let index = sel.recv(&amp;r);
     /// ```
     </span><span class="kw">pub fn </span>recv&lt;T&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, r: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Receiver&lt;T&gt;) -&gt; usize {
         <span class="kw">let </span>i = <span class="self">self</span>.next_index;
         <span class="kw">let </span>ptr = r <span class="kw">as </span><span class="kw-2">*const </span>Receiver&lt;<span class="kw">_</span>&gt; <span class="kw">as </span><span class="kw-2">*const </span>u8;
         <span class="self">self</span>.handles.push((r, i, ptr));
         <span class="self">self</span>.next_index += <span class="number">1</span>;
         i
     }

     <span class="doccomment">/// Removes a previously added operation.
     ///
     /// This is useful when an operation is selected because the channel got disconnected and we
     /// want to try again to select a different operation instead.
     ///
     /// If new operations are added after removing some, the indices of removed operations will not
     /// be reused.
     ///
     /// # Panics
     ///
     /// An attempt to remove a non-existing or already removed operation will panic.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded::&lt;i32&gt;();
     /// let (_, r2) = unbounded::&lt;i32&gt;();
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // Both operations are initially ready, so a random one will be executed.
     /// let oper = sel.select();
     /// assert_eq!(oper.index(), oper2);
     /// assert!(oper.recv(&amp;r2).is_err());
     /// sel.remove(oper2);
     ///
     /// s1.send(10).unwrap();
     ///
     /// let oper = sel.select();
     /// assert_eq!(oper.index(), oper1);
     /// assert_eq!(oper.recv(&amp;r1), Ok(10));
     /// ```
     </span><span class="kw">pub fn </span>remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) {
         <span class="macro">assert!</span>(
             index &lt; <span class="self">self</span>.next_index,
             <span class="string">&quot;index out of bounds; {} &gt;= {}&quot;</span>,
             index,
             <span class="self">self</span>.next_index,
         );

         <span class="kw">let </span>i = <span class="self">self
             </span>.handles
             .iter()
             .enumerate()
             .find(|(<span class="kw">_</span>, (<span class="kw">_</span>, i, <span class="kw">_</span>))| <span class="kw-2">*</span>i == index)
             .expect(<span class="string">&quot;no operation with this index&quot;</span>)
             .<span class="number">0</span>;

         <span class="self">self</span>.handles.swap_remove(i);
     }

     <span class="doccomment">/// Attempts to select one of the operations without blocking.
     ///
     /// If an operation is ready, it is selected and returned. If multiple operations are ready at
     /// the same time, a random one among them is selected. If none of the operations are ready, an
     /// error is returned.
     ///
     /// 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.
     ///
     /// The selected operation must be completed with [`SelectedOperation::send`]
     /// or [`SelectedOperation::recv`].
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// s1.send(10).unwrap();
     /// s2.send(20).unwrap();
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // Both operations are initially ready, so a random one will be executed.
     /// let oper = sel.try_select();
     /// match oper {
     ///     Err(_) =&gt; panic!(&quot;both operations should be ready&quot;),
     ///     Ok(oper) =&gt; match oper.index() {
     ///         i if i == oper1 =&gt; assert_eq!(oper.recv(&amp;r1), Ok(10)),
     ///         i if i == oper2 =&gt; assert_eq!(oper.recv(&amp;r2), Ok(20)),
     ///         _ =&gt; unreachable!(),
     ///     }
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_select(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, TrySelectError&gt; {
         try_select(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles)
     }

     <span class="doccomment">/// Blocks until one of the operations becomes ready and selects it.
     ///
     /// Once an operation becomes ready, it is selected and returned. If multiple operations are
     /// ready at the same time, a random one among them is selected.
     ///
     /// 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.
     ///
     /// The selected operation must be completed with [`SelectedOperation::send`]
     /// or [`SelectedOperation::recv`].
     ///
     /// # Panics
     ///
     /// Panics if no operations have been added to `Select`.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::Duration;
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// let oper = sel.select();
     /// match oper.index() {
     ///     i if i == oper1 =&gt; assert_eq!(oper.recv(&amp;r1), Ok(10)),
     ///     i if i == oper2 =&gt; assert_eq!(oper.recv(&amp;r2), Ok(20)),
     ///     _ =&gt; unreachable!(),
     /// }
     /// ```
     </span><span class="kw">pub fn </span>select(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt; {
         select(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles)
     }

     <span class="doccomment">/// Blocks for a limited time until one of the operations becomes ready and selects it.
     ///
     /// If an operation becomes ready, it is selected and returned. If multiple operations are
     /// ready at the same time, a random one among them is selected. If none of the operations
     /// become ready for the specified duration, an error is returned.
     ///
     /// 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.
     ///
     /// The selected operation must be completed with [`SelectedOperation::send`]
     /// or [`SelectedOperation::recv`].
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::Duration;
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// let oper = sel.select_timeout(Duration::from_millis(500));
     /// match oper {
     ///     Err(_) =&gt; panic!(&quot;should not have timed out&quot;),
     ///     Ok(oper) =&gt; match oper.index() {
     ///         i if i == oper1 =&gt; assert_eq!(oper.recv(&amp;r1), Ok(10)),
     ///         i if i == oper2 =&gt; assert_eq!(oper.recv(&amp;r2), Ok(20)),
     ///         _ =&gt; unreachable!(),
     ///     }
     /// }
     /// ```
     </span><span class="kw">pub fn </span>select_timeout(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         timeout: Duration,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, SelectTimeoutError&gt; {
         select_timeout(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles, timeout)
     }

     <span class="doccomment">/// Blocks until a given deadline, or until one of the operations becomes ready and selects it.
     ///
     /// If an operation becomes ready, it is selected and returned. If multiple operations are
     /// ready at the same time, a random one among them is selected. If none of the operations
     /// become ready before the given deadline, an error is returned.
     ///
     /// 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.
     ///
     /// The selected operation must be completed with [`SelectedOperation::send`]
     /// or [`SelectedOperation::recv`].
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::{Instant, Duration};
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// let deadline = Instant::now() + Duration::from_millis(500);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// let oper = sel.select_deadline(deadline);
     /// match oper {
     ///     Err(_) =&gt; panic!(&quot;should not have timed out&quot;),
     ///     Ok(oper) =&gt; match oper.index() {
     ///         i if i == oper1 =&gt; assert_eq!(oper.recv(&amp;r1), Ok(10)),
     ///         i if i == oper2 =&gt; assert_eq!(oper.recv(&amp;r2), Ok(20)),
     ///         _ =&gt; unreachable!(),
     ///     }
     /// }
     /// ```
     </span><span class="kw">pub fn </span>select_deadline(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         deadline: Instant,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt;, SelectTimeoutError&gt; {
         select_deadline(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles, deadline)
     }

     <span class="doccomment">/// Attempts to find a ready operation without blocking.
     ///
     /// If an operation is ready, its index is returned. If multiple operations are ready at the
     /// same time, a random one among them is chosen. If none of the operations are ready, an error
     /// is returned.
     ///
     /// 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.
     ///
     /// Note that this method might return with success spuriously, so it&#39;s a good idea to always
     /// double check if the operation is really ready.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// s1.send(10).unwrap();
     /// s2.send(20).unwrap();
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // Both operations are initially ready, so a random one will be chosen.
     /// match sel.try_ready() {
     ///     Err(_) =&gt; panic!(&quot;both operations should be ready&quot;),
     ///     Ok(i) if i == oper1 =&gt; assert_eq!(r1.try_recv(), Ok(10)),
     ///     Ok(i) if i == oper2 =&gt; assert_eq!(r2.try_recv(), Ok(20)),
     ///     Ok(_) =&gt; unreachable!(),
     /// }
     /// ```
     </span><span class="kw">pub fn </span>try_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;usize, TryReadyError&gt; {
         <span class="kw">match </span>run_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles, Timeout::Now) {
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(TryReadyError),
             <span class="prelude-val">Some</span>(index) =&gt; <span class="prelude-val">Ok</span>(index),
         }
     }

     <span class="doccomment">/// Blocks until one of the operations becomes ready.
     ///
     /// Once an operation becomes ready, its index is returned. If multiple operations are ready at
     /// the same time, a random one among them is chosen.
     ///
     /// 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.
     ///
     /// Note that this method might return with success spuriously, so it&#39;s a good idea to always
     /// double check if the operation is really ready.
     ///
     /// # Panics
     ///
     /// Panics if no operations have been added to `Select`.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::Duration;
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// match sel.ready() {
     ///     i if i == oper1 =&gt; assert_eq!(r1.try_recv(), Ok(10)),
     ///     i if i == oper2 =&gt; assert_eq!(r2.try_recv(), Ok(20)),
     ///     _ =&gt; unreachable!(),
     /// }
     /// ```
     </span><span class="kw">pub fn </span>ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; usize {
         <span class="kw">if </span><span class="self">self</span>.handles.is_empty() {
             <span class="macro">panic!</span>(<span class="string">&quot;no operations have been added to `Select`&quot;</span>);
         }

         run_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles, Timeout::Never).unwrap()
     }

     <span class="doccomment">/// Blocks for a limited time until one of the operations becomes ready.
     ///
     /// If an operation becomes ready, its index is returned. If multiple operations are ready at
     /// the same time, a random one among them is chosen. If none of the operations become ready
     /// for the specified duration, an error is returned.
     ///
     /// 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.
     ///
     /// Note that this method might return with success spuriously, so it&#39;s a good idea to double
     /// check if the operation is really ready.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::Duration;
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// match sel.ready_timeout(Duration::from_millis(500)) {
     ///     Err(_) =&gt; panic!(&quot;should not have timed out&quot;),
     ///     Ok(i) if i == oper1 =&gt; assert_eq!(r1.try_recv(), Ok(10)),
     ///     Ok(i) if i == oper2 =&gt; assert_eq!(r2.try_recv(), Ok(20)),
     ///     Ok(_) =&gt; unreachable!(),
     /// }
     /// ```
     </span><span class="kw">pub fn </span>ready_timeout(<span class="kw-2">&amp;mut </span><span class="self">self</span>, timeout: Duration) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ReadyTimeoutError&gt; {
         <span class="kw">match </span>Instant::now().checked_add(timeout) {
             <span class="prelude-val">Some</span>(deadline) =&gt; <span class="self">self</span>.ready_deadline(deadline),
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Ok</span>(<span class="self">self</span>.ready()),
         }
     }

     <span class="doccomment">/// Blocks until a given deadline, or until one of the operations becomes ready.
     ///
     /// If an operation becomes ready, its index is returned. If multiple operations are ready at
     /// the same time, a random one among them is chosen. If none of the operations become ready
     /// before the deadline, an error is returned.
     ///
     /// 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.
     ///
     /// Note that this method might return with success spuriously, so it&#39;s a good idea to double
     /// check if the operation is really ready.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::thread;
     /// use std::time::{Duration, Instant};
     /// use crossbeam_channel::{unbounded, Select};
     ///
     /// let deadline = Instant::now() + Duration::from_millis(500);
     ///
     /// let (s1, r1) = unbounded();
     /// let (s2, r2) = unbounded();
     ///
     /// thread::spawn(move || {
     ///     thread::sleep(Duration::from_secs(1));
     ///     s1.send(10).unwrap();
     /// });
     /// thread::spawn(move || s2.send(20).unwrap());
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r1);
     /// let oper2 = sel.recv(&amp;r2);
     ///
     /// // The second operation will be selected because it becomes ready first.
     /// match sel.ready_deadline(deadline) {
     ///     Err(_) =&gt; panic!(&quot;should not have timed out&quot;),
     ///     Ok(i) if i == oper1 =&gt; assert_eq!(r1.try_recv(), Ok(10)),
     ///     Ok(i) if i == oper2 =&gt; assert_eq!(r2.try_recv(), Ok(20)),
     ///     Ok(_) =&gt; unreachable!(),
     /// }
     /// ```
     </span><span class="kw">pub fn </span>ready_deadline(<span class="kw-2">&amp;mut </span><span class="self">self</span>, deadline: Instant) -&gt; <span class="prelude-ty">Result</span>&lt;usize, ReadyTimeoutError&gt; {
         <span class="kw">match </span>run_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handles, Timeout::At(deadline)) {
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(ReadyTimeoutError),
             <span class="prelude-val">Some</span>(index) =&gt; <span class="prelude-val">Ok</span>(index),
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Clone <span class="kw">for </span>Select&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Select&lt;<span class="lifetime">&#39;a</span>&gt; {
         Select {
             handles: <span class="self">self</span>.handles.clone(),
             next_index: <span class="self">self</span>.next_index,
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Default <span class="kw">for </span>Select&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>default() -&gt; Select&lt;<span class="lifetime">&#39;a</span>&gt; {
         Select::new()
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Select&lt;<span class="lifetime">&#39;_</span>&gt; {
     <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.pad(<span class="string">&quot;Select { .. }&quot;</span>)
     }
 }

 <span class="doccomment">/// A selected operation that needs to be completed.
 ///
 /// To complete the operation, call [`send`] or [`recv`].
 ///
 /// # Panics
 ///
 /// Forgetting to complete the operation is an error and might lead to deadlocks. If a
 /// `SelectedOperation` is dropped without completion, a panic occurs.
 ///
 /// [`send`]: SelectedOperation::send
 /// [`recv`]: SelectedOperation::recv
 </span><span class="attribute">#[must_use]
 </span><span class="kw">pub struct </span>SelectedOperation&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Token needed to complete the operation.
     </span>token: Token,

     <span class="doccomment">/// The index of the selected operation.
     </span>index: usize,

     <span class="doccomment">/// The address of the selected `Sender` or `Receiver`.
     </span>ptr: <span class="kw-2">*const </span>u8,

     <span class="doccomment">/// Indicates that `Sender`s and `Receiver`s are borrowed.
     </span>_marker: PhantomData&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>()&gt;,
 }

 <span class="kw">impl </span>SelectedOperation&lt;<span class="lifetime">&#39;_</span>&gt; {
     <span class="doccomment">/// Returns the index of the selected operation.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{bounded, Select};
     ///
     /// let (s1, r1) = bounded::&lt;()&gt;(0);
     /// let (s2, r2) = bounded::&lt;()&gt;(0);
     /// let (s3, r3) = bounded::&lt;()&gt;(1);
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.send(&amp;s1);
     /// let oper2 = sel.recv(&amp;r2);
     /// let oper3 = sel.send(&amp;s3);
     ///
     /// // Only the last operation is ready.
     /// let oper = sel.select();
     /// assert_eq!(oper.index(), 2);
     /// assert_eq!(oper.index(), oper3);
     ///
     /// // Complete the operation.
     /// oper.send(&amp;s3, ()).unwrap();
     /// ```
     </span><span class="kw">pub fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.index
     }

     <span class="doccomment">/// Completes the send operation.
     ///
     /// The passed [`Sender`] reference must be the same one that was used in [`Select::send`]
     /// when the operation was added.
     ///
     /// # Panics
     ///
     /// Panics if an incorrect [`Sender`] reference is passed.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{bounded, Select, SendError};
     ///
     /// let (s, r) = bounded::&lt;i32&gt;(0);
     /// drop(r);
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.send(&amp;s);
     ///
     /// let oper = sel.select();
     /// assert_eq!(oper.index(), oper1);
     /// assert_eq!(oper.send(&amp;s, 10), Err(SendError(10)));
     /// ```
     </span><span class="kw">pub fn </span>send&lt;T&gt;(<span class="kw-2">mut </span><span class="self">self</span>, s: <span class="kw-2">&amp;</span>Sender&lt;T&gt;, msg: T) -&gt; <span class="prelude-ty">Result</span>&lt;(), SendError&lt;T&gt;&gt; {
         <span class="macro">assert!</span>(
             s <span class="kw">as </span><span class="kw-2">*const </span>Sender&lt;T&gt; <span class="kw">as </span><span class="kw-2">*const </span>u8 == <span class="self">self</span>.ptr,
             <span class="string">&quot;passed a sender that wasn&#39;t selected&quot;</span>,
         );
         <span class="kw">let </span>res = <span class="kw">unsafe </span>{ channel::write(s, <span class="kw-2">&amp;mut </span><span class="self">self</span>.token, msg) };
         mem::forget(<span class="self">self</span>);
         res.map_err(SendError)
     }

     <span class="doccomment">/// Completes the receive operation.
     ///
     /// The passed [`Receiver`] reference must be the same one that was used in [`Select::recv`]
     /// when the operation was added.
     ///
     /// # Panics
     ///
     /// Panics if an incorrect [`Receiver`] reference is passed.
     ///
     /// # Examples
     ///
     /// ```
     /// use crossbeam_channel::{bounded, Select, RecvError};
     ///
     /// let (s, r) = bounded::&lt;i32&gt;(0);
     /// drop(s);
     ///
     /// let mut sel = Select::new();
     /// let oper1 = sel.recv(&amp;r);
     ///
     /// let oper = sel.select();
     /// assert_eq!(oper.index(), oper1);
     /// assert_eq!(oper.recv(&amp;r), Err(RecvError));
     /// ```
     </span><span class="kw">pub fn </span>recv&lt;T&gt;(<span class="kw-2">mut </span><span class="self">self</span>, r: <span class="kw-2">&amp;</span>Receiver&lt;T&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;T, RecvError&gt; {
         <span class="macro">assert!</span>(
             r <span class="kw">as </span><span class="kw-2">*const </span>Receiver&lt;T&gt; <span class="kw">as </span><span class="kw-2">*const </span>u8 == <span class="self">self</span>.ptr,
             <span class="string">&quot;passed a receiver that wasn&#39;t selected&quot;</span>,
         );
         <span class="kw">let </span>res = <span class="kw">unsafe </span>{ channel::read(r, <span class="kw-2">&amp;mut </span><span class="self">self</span>.token) };
         mem::forget(<span class="self">self</span>);
         res.map_err(|<span class="kw">_</span>| RecvError)
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>SelectedOperation&lt;<span class="lifetime">&#39;_</span>&gt; {
     <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.pad(<span class="string">&quot;SelectedOperation { .. }&quot;</span>)
     }
 }

 <span class="kw">impl </span>Drop <span class="kw">for </span>SelectedOperation&lt;<span class="lifetime">&#39;_</span>&gt; {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="macro">panic!</span>(<span class="string">&quot;dropped `SelectedOperation` without completing the operation&quot;</span>);
     }
 }
 </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>