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</pre><pre class="rust"><code><span class="doccomment">//! Thread-local context used in select.</span>
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<span class="kw">use</span> <span class="ident">std::cell::Cell</span>;
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<span class="kw">use</span> <span class="ident">std::ptr</span>;
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<span class="kw">use</span> <span class="ident">std::sync::atomic</span>::{<span class="ident">AtomicPtr</span>, <span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
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<span class="kw">use</span> <span class="ident">std::sync::Arc</span>;
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<span class="kw">use</span> <span class="ident">std::thread</span>::{<span class="self">self</span>, <span class="ident">Thread</span>, <span class="ident">ThreadId</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">crossbeam_utils::Backoff</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::select::Selected</span>;
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<span class="doccomment">/// Thread-local context used in select.</span>
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<span class="comment">// This is a private API that is used by the select macro.</span>
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Context</span> {
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<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">Inner</span><span class="op">></span>,
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}
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<span class="doccomment">/// Inner representation of `Context`.</span>
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
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<span class="kw">struct</span> <span class="ident">Inner</span> {
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<span class="doccomment">/// Selected operation.</span>
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<span class="ident">select</span>: <span class="ident">AtomicUsize</span>,
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<span class="doccomment">/// A slot into which another thread may store a pointer to its `Packet`.</span>
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<span class="ident">packet</span>: <span class="ident">AtomicPtr</span><span class="op"><</span>()<span class="op">></span>,
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<span class="doccomment">/// Thread handle.</span>
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<span class="ident">thread</span>: <span class="ident">Thread</span>,
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<span class="doccomment">/// Thread id.</span>
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<span class="ident">thread_id</span>: <span class="ident">ThreadId</span>,
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}
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<span class="kw">impl</span> <span class="ident">Context</span> {
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<span class="doccomment">/// Creates a new context for the duration of the closure.</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">fn</span> <span class="ident">with</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="ident">f</span>: <span class="ident">F</span>) -> <span class="ident">R</span>
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<span class="kw">where</span>
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<span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">Context</span>) -> <span class="ident">R</span>,
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{
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<span class="macro">thread_local!</span> {
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<span class="doccomment">/// Cached thread-local context.</span>
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<span class="kw">static</span> <span class="ident">CONTEXT</span>: <span class="ident">Cell</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Context</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="ident">Cell::new</span>(<span class="prelude-val">Some</span>(<span class="ident">Context::new</span>()));
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}
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">f</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">f</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">f</span> <span class="op">=</span> <span class="op">|</span><span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span><span class="op">|</span> -> <span class="ident">R</span> {
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<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
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<span class="ident">f</span>(<span class="ident">cx</span>)
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};
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<span class="ident">CONTEXT</span>
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.<span class="ident">try_with</span>(<span class="op">|</span><span class="ident">cell</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">cell</span>.<span class="ident">take</span>() {
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<span class="prelude-val">None</span> => <span class="ident">f</span>(<span class="kw-2">&</span><span class="ident">Context::new</span>()),
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<span class="prelude-val">Some</span>(<span class="ident">cx</span>) => {
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<span class="ident">cx</span>.<span class="ident">reset</span>();
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<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">f</span>(<span class="kw-2">&</span><span class="ident">cx</span>);
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<span class="ident">cell</span>.<span class="ident">set</span>(<span class="prelude-val">Some</span>(<span class="ident">cx</span>));
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<span class="ident">res</span>
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}
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})
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.<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">f</span>(<span class="kw-2">&</span><span class="ident">Context::new</span>()))
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}
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<span class="doccomment">/// Creates a new `Context`.</span>
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<span class="attribute">#[<span class="ident">cold</span>]</span>
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<span class="kw">fn</span> <span class="ident">new</span>() -> <span class="ident">Context</span> {
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<span class="ident">Context</span> {
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<span class="ident">inner</span>: <span class="ident">Arc::new</span>(<span class="ident">Inner</span> {
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<span class="ident">select</span>: <span class="ident">AtomicUsize::new</span>(<span class="ident">Selected::Waiting</span>.<span class="ident">into</span>()),
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<span class="ident">packet</span>: <span class="ident">AtomicPtr::new</span>(<span class="ident">ptr::null_mut</span>()),
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<span class="ident">thread</span>: <span class="ident">thread::current</span>(),
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<span class="ident">thread_id</span>: <span class="ident">thread::current</span>().<span class="ident">id</span>(),
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}),
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}
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}
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<span class="doccomment">/// Resets `select` and `packet`.</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">reset</span>(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="self">self</span>.<span class="ident">inner</span>
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.<span class="ident">select</span>
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.<span class="ident">store</span>(<span class="ident">Selected::Waiting</span>.<span class="ident">into</span>(), <span class="ident">Ordering::Release</span>);
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<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">packet</span>.<span class="ident">store</span>(<span class="ident">ptr::null_mut</span>(), <span class="ident">Ordering::Release</span>);
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}
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<span class="doccomment">/// Attempts to select an operation.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// On failure, the previously selected operation is returned.</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">fn</span> <span class="ident">try_select</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">select</span>: <span class="ident">Selected</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Selected</span><span class="op">></span> {
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<span class="self">self</span>.<span class="ident">inner</span>
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.<span class="ident">select</span>
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.<span class="ident">compare_exchange</span>(
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<span class="ident">Selected::Waiting</span>.<span class="ident">into</span>(),
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<span class="ident">select</span>.<span class="ident">into</span>(),
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<span class="ident">Ordering::AcqRel</span>,
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<span class="ident">Ordering::Acquire</span>,
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)
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.<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> ())
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.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">into</span>())
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}
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<span class="doccomment">/// Returns the selected operation.</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">fn</span> <span class="ident">selected</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">Selected</span> {
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<span class="ident">Selected::from</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">select</span>.<span class="ident">load</span>(<span class="ident">Ordering::Acquire</span>))
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}
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|
||
<span class="doccomment">/// Stores a packet.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// This method must be called after `try_select` succeeds and there is a packet to provide.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">store_packet</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">packet</span>: <span class="kw-2">*mut</span> ()) {
|
||
<span class="kw">if</span> <span class="op">!</span><span class="ident">packet</span>.<span class="ident">is_null</span>() {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">packet</span>.<span class="ident">store</span>(<span class="ident">packet</span>, <span class="ident">Ordering::Release</span>);
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Waits until a packet is provided and returns it.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_packet</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*mut</span> () {
|
||
<span class="kw">let</span> <span class="ident">backoff</span> <span class="op">=</span> <span class="ident">Backoff::new</span>();
|
||
<span class="kw">loop</span> {
|
||
<span class="kw">let</span> <span class="ident">packet</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">packet</span>.<span class="ident">load</span>(<span class="ident">Ordering::Acquire</span>);
|
||
<span class="kw">if</span> <span class="op">!</span><span class="ident">packet</span>.<span class="ident">is_null</span>() {
|
||
<span class="kw">return</span> <span class="ident">packet</span>;
|
||
}
|
||
<span class="ident">backoff</span>.<span class="ident">snooze</span>();
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Waits until an operation is selected and returns it.</span>
|
||
<span class="doccomment">///</span>
|
||
<span class="doccomment">/// If the deadline is reached, `Selected::Aborted` will be selected.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_until</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="ident">Selected</span> {
|
||
<span class="comment">// Spin for a short time, waiting until an operation is selected.</span>
|
||
<span class="kw">let</span> <span class="ident">backoff</span> <span class="op">=</span> <span class="ident">Backoff::new</span>();
|
||
<span class="kw">loop</span> {
|
||
<span class="kw">let</span> <span class="ident">sel</span> <span class="op">=</span> <span class="ident">Selected::from</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">select</span>.<span class="ident">load</span>(<span class="ident">Ordering::Acquire</span>));
|
||
<span class="kw">if</span> <span class="ident">sel</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Selected::Waiting</span> {
|
||
<span class="kw">return</span> <span class="ident">sel</span>;
|
||
}
|
||
|
||
<span class="kw">if</span> <span class="ident">backoff</span>.<span class="ident">is_completed</span>() {
|
||
<span class="kw">break</span>;
|
||
} <span class="kw">else</span> {
|
||
<span class="ident">backoff</span>.<span class="ident">snooze</span>();
|
||
}
|
||
}
|
||
|
||
<span class="kw">loop</span> {
|
||
<span class="comment">// Check whether an operation has been selected.</span>
|
||
<span class="kw">let</span> <span class="ident">sel</span> <span class="op">=</span> <span class="ident">Selected::from</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">select</span>.<span class="ident">load</span>(<span class="ident">Ordering::Acquire</span>));
|
||
<span class="kw">if</span> <span class="ident">sel</span> <span class="op">!</span><span class="op">=</span> <span class="ident">Selected::Waiting</span> {
|
||
<span class="kw">return</span> <span class="ident">sel</span>;
|
||
}
|
||
|
||
<span class="comment">// If there's a deadline, park the current thread until the deadline is reached.</span>
|
||
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">end</span>) <span class="op">=</span> <span class="ident">deadline</span> {
|
||
<span class="kw">let</span> <span class="ident">now</span> <span class="op">=</span> <span class="ident">Instant::now</span>();
|
||
|
||
<span class="kw">if</span> <span class="ident">now</span> <span class="op"><</span> <span class="ident">end</span> {
|
||
<span class="ident">thread::park_timeout</span>(<span class="ident">end</span> <span class="op">-</span> <span class="ident">now</span>);
|
||
} <span class="kw">else</span> {
|
||
<span class="comment">// The deadline has been reached. Try aborting select.</span>
|
||
<span class="kw">return</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">try_select</span>(<span class="ident">Selected::Aborted</span>) {
|
||
<span class="prelude-val">Ok</span>(()) => <span class="ident">Selected::Aborted</span>,
|
||
<span class="prelude-val">Err</span>(<span class="ident">s</span>) => <span class="ident">s</span>,
|
||
};
|
||
}
|
||
} <span class="kw">else</span> {
|
||
<span class="ident">thread::park</span>();
|
||
}
|
||
}
|
||
}
|
||
|
||
<span class="doccomment">/// Unparks the thread this context belongs to.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unpark</span>(<span class="kw-2">&</span><span class="self">self</span>) {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">thread</span>.<span class="ident">unpark</span>();
|
||
}
|
||
|
||
<span class="doccomment">/// Returns the id of the thread this context belongs to.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">thread_id</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">ThreadId</span> {
|
||
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">thread_id</span>
|
||
}
|
||
}
|
||
</code></pre></div>
|
||
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