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</pre><pre class="rust">
<span class="kw">use</span> <span class="ident">crossbeam_deque</span>::{<span class="ident">Steal</span>, <span class="ident">Stealer</span>, <span class="ident">Worker</span>};
<span class="kw">use</span> <span class="ident">std::sync::atomic</span>::{<span class="ident">AtomicBool</span>, <span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">std::sync</span>::{<span class="ident">Mutex</span>, <span class="ident">TryLockError</span>};
<span class="kw">use</span> <span class="ident">std::thread::yield_now</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::current_num_threads</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::iter::plumbing</span>::{<span class="ident">bridge_unindexed</span>, <span class="ident">Folder</span>, <span class="ident">UnindexedConsumer</span>, <span class="ident">UnindexedProducer</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::iter::ParallelIterator</span>;
<span class="doccomment">/// Conversion trait to convert an `Iterator` to a `ParallelIterator`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This creates a "bridge" from a sequential iterator to a parallel one, by distributing its items</span>
<span class="doccomment">/// across the Rayon thread pool. This has the advantage of being able to parallelize just about</span>
<span class="doccomment">/// anything, but the resulting `ParallelIterator` can be less efficient than if you started with</span>
<span class="doccomment">/// `par_iter` instead. However, it can still be useful for iterators that are difficult to</span>
<span class="doccomment">/// parallelize by other means, like channels or file or network I/O.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The resulting iterator is not guaranteed to keep the order of the original iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To use this trait, take an existing `Iterator` and call `par_bridge` on it. After that, you can</span>
<span class="doccomment">/// use any of the `ParallelIterator` methods:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use rayon::iter::ParallelBridge;</span>
<span class="doccomment">/// use rayon::prelude::ParallelIterator;</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let rx = {</span>
<span class="doccomment">/// let (tx, rx) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// tx.send("one!");</span>
<span class="doccomment">/// tx.send("two!");</span>
<span class="doccomment">/// tx.send("three!");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// rx</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut output: Vec<&'static str> = rx.into_iter().par_bridge().collect();</span>
<span class="doccomment">/// output.sort_unstable();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&*output, &["one!", "three!", "two!"]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">ParallelBridge</span>: <span class="ident">Sized</span> {
<span class="doccomment">/// Creates a bridge from this type to a `ParallelIterator`.</span>
<span class="kw">fn</span> <span class="ident">par_bridge</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">IterBridge</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>;
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">ParallelBridge</span> <span class="kw">for</span> <span class="ident">T</span>
<span class="kw">where</span>
<span class="ident">T::Item</span>: <span class="ident">Send</span>,
{
<span class="kw">fn</span> <span class="ident">par_bridge</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">IterBridge</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="ident">IterBridge</span> { <span class="ident">iter</span>: <span class="self">self</span> }
}
}
<span class="doccomment">/// `IterBridge` is a parallel iterator that wraps a sequential iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type is created when using the `par_bridge` method on `ParallelBridge`. See the</span>
<span class="doccomment">/// [`ParallelBridge`] documentation for details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`ParallelBridge`]: trait.ParallelBridge.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IterBridge</span><span class="op"><</span><span class="ident">Iter</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">Iter</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">Iter</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span> <span class="ident">ParallelIterator</span> <span class="kw">for</span> <span class="ident">IterBridge</span><span class="op"><</span><span class="ident">Iter</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">Iter::Item</span>: <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Iter::Item</span>;
<span class="kw">fn</span> <span class="ident">drive_unindexed</span><span class="op"><</span><span class="ident">C</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">consumer</span>: <span class="ident">C</span>) <span class="op">-</span><span class="op">></span> <span class="ident">C::Result</span>
<span class="kw">where</span>
<span class="ident">C</span>: <span class="ident">UnindexedConsumer</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
{
<span class="kw">let</span> <span class="ident">split_count</span> <span class="op">=</span> <span class="ident">AtomicUsize::new</span>(<span class="ident">current_num_threads</span>());
<span class="kw">let</span> <span class="ident">worker</span> <span class="op">=</span> <span class="ident">Worker::new_fifo</span>();
<span class="kw">let</span> <span class="ident">stealer</span> <span class="op">=</span> <span class="ident">worker</span>.<span class="ident">stealer</span>();
<span class="kw">let</span> <span class="ident">done</span> <span class="op">=</span> <span class="ident">AtomicBool::new</span>(<span class="bool-val">false</span>);
<span class="kw">let</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">Mutex::new</span>((<span class="self">self</span>.<span class="ident">iter</span>, <span class="ident">worker</span>));
<span class="ident">bridge_unindexed</span>(
<span class="ident">IterParallelProducer</span> {
<span class="ident">split_count</span>: <span class="kw-2">&</span><span class="ident">split_count</span>,
<span class="ident">done</span>: <span class="kw-2">&</span><span class="ident">done</span>,
<span class="ident">iter</span>: <span class="kw-2">&</span><span class="ident">iter</span>,
<span class="ident">items</span>: <span class="ident">stealer</span>,
},
<span class="ident">consumer</span>,
)
}
}
<span class="kw">struct</span> <span class="ident">IterParallelProducer</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Iter</span>: <span class="ident">Iterator</span><span class="op">></span> {
<span class="ident">split_count</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">AtomicUsize</span>,
<span class="ident">done</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">AtomicBool</span>,
<span class="ident">iter</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Mutex</span><span class="op"><</span>(<span class="ident">Iter</span>, <span class="ident">Worker</span><span class="op"><</span><span class="ident">Iter::Item</span><span class="op">></span>)<span class="op">></span>,
<span class="ident">items</span>: <span class="ident">Stealer</span><span class="op"><</span><span class="ident">Iter::Item</span><span class="op">></span>,
}
<span class="comment">// manual clone because T doesn't need to be Clone, but the derive assumes it should be</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Iter</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">IterParallelProducer</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Iter</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">IterParallelProducer</span> {
<span class="ident">split_count</span>: <span class="self">self</span>.<span class="ident">split_count</span>,
<span class="ident">done</span>: <span class="self">self</span>.<span class="ident">done</span>,
<span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>,
<span class="ident">items</span>: <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">clone</span>(),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Iter</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> <span class="ident">UnindexedProducer</span> <span class="kw">for</span> <span class="ident">IterParallelProducer</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">Iter</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">Iter::Item</span>: <span class="ident">Send</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Iter::Item</span>;
<span class="kw">fn</span> <span class="ident">split</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="self">Self</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">split_count</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>);
<span class="kw">loop</span> {
<span class="comment">// Check if the iterator is exhausted *and* we've consumed every item from it.</span>
<span class="kw">let</span> <span class="ident">done</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">done</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>) <span class="op">&&</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">is_empty</span>();
<span class="kw">match</span> <span class="ident">count</span>.<span class="ident">checked_sub</span>(<span class="number">1</span>) {
<span class="prelude-val">Some</span>(<span class="ident">new_count</span>) <span class="kw">if</span> <span class="op">!</span><span class="ident">done</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">split_count</span>.<span class="ident">compare_exchange_weak</span>(
<span class="ident">count</span>,
<span class="ident">new_count</span>,
<span class="ident">Ordering::SeqCst</span>,
<span class="ident">Ordering::SeqCst</span>,
) {
<span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="kw">return</span> (<span class="self">self</span>.<span class="ident">clone</span>(), <span class="prelude-val">Some</span>(<span class="self">self</span>)),
<span class="prelude-val">Err</span>(<span class="ident">last_count</span>) <span class="op">=</span><span class="op">></span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">last_count</span>,
}
}
<span class="kw">_</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> (<span class="self">self</span>, <span class="prelude-val">None</span>);
}
}
}
}
<span class="kw">fn</span> <span class="ident">fold_with</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">folder</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">F</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">Folder</span><span class="op"><</span><span class="self">Self</span><span class="ident">::Item</span><span class="op">></span>,
{
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">steal</span>() {
<span class="ident">Steal::Success</span>(<span class="ident">it</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">folder</span> <span class="op">=</span> <span class="ident">folder</span>.<span class="ident">consume</span>(<span class="ident">it</span>);
<span class="kw">if</span> <span class="ident">folder</span>.<span class="ident">full</span>() {
<span class="kw">return</span> <span class="ident">folder</span>;
}
}
<span class="ident">Steal::Empty</span> <span class="op">=</span><span class="op">></span> {
<span class="comment">// Don't storm the mutex if we're already done.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">done</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>) {
<span class="comment">// Someone might have pushed more between our `steal()` and `done.load()`</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">is_empty</span>() {
<span class="comment">// The iterator is out of items, no use in continuing</span>
<span class="kw">return</span> <span class="ident">folder</span>;
}
} <span class="kw">else</span> {
<span class="comment">// our cache is out of items, time to load more from the iterator</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">try_lock</span>() {
<span class="prelude-val">Ok</span>(<span class="kw-2">mut</span> <span class="ident">guard</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// Check `done` again in case we raced with the previous lock</span>
<span class="comment">// holder on its way out.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">done</span>.<span class="ident">load</span>(<span class="ident">Ordering::SeqCst</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">is_empty</span>() {
<span class="kw">return</span> <span class="ident">folder</span>;
}
<span class="kw">continue</span>;
}
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">current_num_threads</span>();
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> (<span class="ident">count</span> <span class="op">*</span> <span class="ident">count</span>) <span class="op">*</span> <span class="number">2</span>;
<span class="kw">let</span> (<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">iter</span>, <span class="kw-2">ref</span> <span class="ident">worker</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">guard</span>;
<span class="comment">// while worker.len() < count {</span>
<span class="comment">// FIXME the new deque doesn't let us count items. We can just</span>
<span class="comment">// push a number of items, but that doesn't consider active</span>
<span class="comment">// stealers elsewhere.</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">count</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">it</span>) <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">next</span>() {
<span class="ident">worker</span>.<span class="ident">push</span>(<span class="ident">it</span>);
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">done</span>.<span class="ident">store</span>(<span class="bool-val">true</span>, <span class="ident">Ordering::SeqCst</span>);
<span class="kw">break</span>;
}
}
}
<span class="prelude-val">Err</span>(<span class="ident">TryLockError::WouldBlock</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// someone else has the mutex, just sit tight until it's ready</span>
<span class="ident">yield_now</span>(); <span class="comment">//TODO: use a thread-pool-aware yield? (#548)</span>
}
<span class="prelude-val">Err</span>(<span class="ident">TryLockError::Poisoned</span>(<span class="kw">_</span>)) <span class="op">=</span><span class="op">></span> {
<span class="comment">// any panics from other threads will have been caught by the pool,</span>
<span class="comment">// and will be re-thrown when joined - just exit</span>
<span class="kw">return</span> <span class="ident">folder</span>;
}
}
}
}
<span class="ident">Steal::Retry</span> <span class="op">=</span><span class="op">></span> (),
}
}
}
}
</pre></div>
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