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</pre><pre class="rust"><code><span class="doccomment">//! Channel that never delivers messages.</span>
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<span class="doccomment">//!</span>
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<span class="doccomment">//! Messages cannot be sent into this kind of channel.</span>
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<span class="kw">use</span> <span class="ident">std::marker::PhantomData</span>;
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<span class="kw">use</span> <span class="ident">std::time::Instant</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::context::Context</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::err</span>::{<span class="ident">RecvTimeoutError</span>, <span class="ident">TryRecvError</span>};
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::select</span>::{<span class="ident">Operation</span>, <span class="ident">SelectHandle</span>, <span class="ident">Token</span>};
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::utils</span>;
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<span class="doccomment">/// This flavor doesn't need a token.</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type</span> <span class="ident">NeverToken</span> <span class="op">=</span> ();
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<span class="doccomment">/// Channel that never delivers messages.</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct</span> <span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="ident">_marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
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}
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<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="doccomment">/// Creates a channel that never delivers messages.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="self">Self</span> {
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<span class="ident">Channel</span> {
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<span class="ident">_marker</span>: <span class="ident">PhantomData</span>,
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}
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}
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<span class="doccomment">/// Attempts to receive a message without blocking.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">try_recv</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">TryRecvError</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">TryRecvError::Empty</span>)
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}
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<span class="doccomment">/// Receives a message from the channel.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">recv</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">deadline</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span> {
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<span class="ident">utils::sleep_until</span>(<span class="ident">deadline</span>);
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<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError::Timeout</span>)
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}
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<span class="doccomment">/// Reads a message from the channel.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_token</span>: <span class="kw-2">&mut</span> <span class="ident">Token</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span> {
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<span class="prelude-val">Err</span>(())
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}
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<span class="doccomment">/// Returns `true` if the channel is empty.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> {
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<span class="bool-val">true</span>
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}
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<span class="doccomment">/// Returns `true` if the channel is full.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">is_full</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> {
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<span class="bool-val">true</span>
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}
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<span class="doccomment">/// Returns the number of messages in the channel.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">usize</span> {
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<span class="number">0</span>
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}
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<span class="doccomment">/// Returns the capacity of the channel.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
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<span class="prelude-val">Some</span>(<span class="number">0</span>)
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}
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}
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<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SelectHandle</span> <span class="kw">for</span> <span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">try_select</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_token</span>: <span class="kw-2">&mut</span> <span class="ident">Token</span>) -> <span class="ident">bool</span> {
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<span class="bool-val">false</span>
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}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">deadline</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span> {
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<span class="prelude-val">None</span>
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}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">register</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_oper</span>: <span class="ident">Operation</span>, <span class="ident">_cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) -> <span class="ident">bool</span> {
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<span class="self">self</span>.<span class="ident">is_ready</span>()
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}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">unregister</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_oper</span>: <span class="ident">Operation</span>) {}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">accept</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">token</span>: <span class="kw-2">&mut</span> <span class="ident">Token</span>, <span class="ident">_cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) -> <span class="ident">bool</span> {
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<span class="self">self</span>.<span class="ident">try_select</span>(<span class="ident">token</span>)
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}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">is_ready</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> {
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<span class="bool-val">false</span>
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}
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">fn</span> <span class="ident">watch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_oper</span>: <span class="ident">Operation</span>, <span class="ident">_cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) -> <span class="ident">bool</span> {
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<span class="self">self</span>.<span class="ident">is_ready</span>()
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}
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||
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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||
<span class="kw">fn</span> <span class="ident">unwatch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_oper</span>: <span class="ident">Operation</span>) {}
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}
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</code></pre></div>
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