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</pre><pre class="rust">
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::job::StackJob</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::latch::SpinLatch</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::registry</span>::{<span class="self">self</span>, <span class="ident">WorkerThread</span>};
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::unwind</span>;
<span class="kw">use</span> <span class="ident">std::any::Any</span>;
<span class="kw">use</span> <span class="kw">crate</span><span class="ident">::FnContext</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span>;
<span class="doccomment">/// Takes two closures and *potentially* runs them in parallel. It</span>
<span class="doccomment">/// returns a pair of the results from those closures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Conceptually, calling `join()` is similar to spawning two threads,</span>
<span class="doccomment">/// one executing each of the two closures. However, the</span>
<span class="doccomment">/// implementation is quite different and incurs very low</span>
<span class="doccomment">/// overhead. The underlying technique is called "work stealing": the</span>
<span class="doccomment">/// Rayon runtime uses a fixed pool of worker threads and attempts to</span>
<span class="doccomment">/// only execute code in parallel when there are idle CPUs to handle</span>
<span class="doccomment">/// it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When `join` is called from outside the thread pool, the calling</span>
<span class="doccomment">/// thread will block while the closures execute in the pool. When</span>
<span class="doccomment">/// `join` is called within the pool, the calling thread still actively</span>
<span class="doccomment">/// participates in the thread pool. It will begin by executing closure</span>
<span class="doccomment">/// A (on the current thread). While it is doing that, it will advertise</span>
<span class="doccomment">/// closure B as being available for other threads to execute. Once closure A</span>
<span class="doccomment">/// has completed, the current thread will try to execute closure B;</span>
<span class="doccomment">/// if however closure B has been stolen, then it will look for other work</span>
<span class="doccomment">/// while waiting for the thief to fully execute closure B. (This is the</span>
<span class="doccomment">/// typical work-stealing strategy).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This example uses join to perform a quick-sort (note this is not a</span>
<span class="doccomment">/// particularly optimized implementation: if you **actually** want to</span>
<span class="doccomment">/// sort for real, you should prefer [the `par_sort` method] offered</span>
<span class="doccomment">/// by Rayon).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [the `par_sort` method]: ../rayon/slice/trait.ParallelSliceMut.html#method.par_sort</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # use rayon_core as rayon;</span>
<span class="doccomment">/// let mut v = vec![5, 1, 8, 22, 0, 44];</span>
<span class="doccomment">/// quick_sort(&mut v);</span>
<span class="doccomment">/// assert_eq!(v, vec![0, 1, 5, 8, 22, 44]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn quick_sort<T:PartialOrd+Send>(v: &mut [T]) {</span>
<span class="doccomment">/// if v.len() > 1 {</span>
<span class="doccomment">/// let mid = partition(v);</span>
<span class="doccomment">/// let (lo, hi) = v.split_at_mut(mid);</span>
<span class="doccomment">/// rayon::join(|| quick_sort(lo),</span>
<span class="doccomment">/// || quick_sort(hi));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Partition rearranges all items `<=` to the pivot</span>
<span class="doccomment">/// // item (arbitrary selected to be the last item in the slice)</span>
<span class="doccomment">/// // to the first half of the slice. It then returns the</span>
<span class="doccomment">/// // "dividing point" where the pivot is placed.</span>
<span class="doccomment">/// fn partition<T:PartialOrd+Send>(v: &mut [T]) -> usize {</span>
<span class="doccomment">/// let pivot = v.len() - 1;</span>
<span class="doccomment">/// let mut i = 0;</span>
<span class="doccomment">/// for j in 0..pivot {</span>
<span class="doccomment">/// if v[j] <= v[pivot] {</span>
<span class="doccomment">/// v.swap(i, j);</span>
<span class="doccomment">/// i += 1;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// v.swap(i, pivot);</span>
<span class="doccomment">/// i</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Warning about blocking I/O</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The assumption is that the closures given to `join()` are</span>
<span class="doccomment">/// CPU-bound tasks that do not perform I/O or other blocking</span>
<span class="doccomment">/// operations. If you do perform I/O, and that I/O should block</span>
<span class="doccomment">/// (e.g., waiting for a network request), the overall performance may</span>
<span class="doccomment">/// be poor. Moreover, if you cause one closure to be blocked waiting</span>
<span class="doccomment">/// on another (for example, using a channel), that could lead to a</span>
<span class="doccomment">/// deadlock.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// No matter what happens, both closures will always be executed. If</span>
<span class="doccomment">/// a single closure panics, whether it be the first or second</span>
<span class="doccomment">/// closure, that panic will be propagated and hence `join()` will</span>
<span class="doccomment">/// panic with the same panic value. If both closures panic, `join()`</span>
<span class="doccomment">/// will panic with the panic value from the first closure.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">join</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">RA</span>, <span class="ident">RB</span><span class="op">></span>(<span class="ident">oper_a</span>: <span class="ident">A</span>, <span class="ident">oper_b</span>: <span class="ident">B</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">RA</span>, <span class="ident">RB</span>)
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="ident">RA</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">B</span>: <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="ident">RB</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">RA</span>: <span class="ident">Send</span>,
<span class="ident">RB</span>: <span class="ident">Send</span>,
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">call</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(<span class="ident">f</span>: <span class="kw">impl</span> <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="kw">impl</span> <span class="ident">FnOnce</span>(<span class="ident">FnContext</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> {
<span class="kw">move</span> <span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">f</span>()
}
<span class="ident">join_context</span>(<span class="ident">call</span>(<span class="ident">oper_a</span>), <span class="ident">call</span>(<span class="ident">oper_b</span>))
}
<span class="doccomment">/// Identical to `join`, except that the closures have a parameter</span>
<span class="doccomment">/// that provides context for the way the closure has been called,</span>
<span class="doccomment">/// especially indicating whether they're executing on a different</span>
<span class="doccomment">/// thread than where `join_context` was called. This will occur if</span>
<span class="doccomment">/// the second job is stolen by a different thread, or if</span>
<span class="doccomment">/// `join_context` was called from outside the thread pool to begin</span>
<span class="doccomment">/// with.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">join_context</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">RA</span>, <span class="ident">RB</span><span class="op">></span>(<span class="ident">oper_a</span>: <span class="ident">A</span>, <span class="ident">oper_b</span>: <span class="ident">B</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">RA</span>, <span class="ident">RB</span>)
<span class="kw">where</span>
<span class="ident">A</span>: <span class="ident">FnOnce</span>(<span class="ident">FnContext</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RA</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">B</span>: <span class="ident">FnOnce</span>(<span class="ident">FnContext</span>) <span class="op">-</span><span class="op">></span> <span class="ident">RB</span> <span class="op">+</span> <span class="ident">Send</span>,
<span class="ident">RA</span>: <span class="ident">Send</span>,
<span class="ident">RB</span>: <span class="ident">Send</span>,
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">call_a</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(<span class="ident">f</span>: <span class="kw">impl</span> <span class="ident">FnOnce</span>(<span class="ident">FnContext</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>, <span class="ident">injected</span>: <span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="kw">impl</span> <span class="ident">FnOnce</span>() <span class="op">-</span><span class="op">></span> <span class="ident">R</span> {
<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">FnContext::new</span>(<span class="ident">injected</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">call_b</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(<span class="ident">f</span>: <span class="kw">impl</span> <span class="ident">FnOnce</span>(<span class="ident">FnContext</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> <span class="kw">impl</span> <span class="ident">FnOnce</span>(<span class="ident">bool</span>) <span class="op">-</span><span class="op">></span> <span class="ident">R</span> {
<span class="kw">move</span> <span class="op">|</span><span class="ident">migrated</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">FnContext::new</span>(<span class="ident">migrated</span>))
}
<span class="ident">registry::in_worker</span>(<span class="op">|</span><span class="ident">worker_thread</span>, <span class="ident">injected</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="comment">// Create virtual wrapper for task b; this all has to be</span>
<span class="comment">// done here so that the stack frame can keep it all live</span>
<span class="comment">// long enough.</span>
<span class="kw">let</span> <span class="ident">job_b</span> <span class="op">=</span> <span class="ident">StackJob::new</span>(<span class="ident">call_b</span>(<span class="ident">oper_b</span>), <span class="ident">SpinLatch::new</span>(<span class="ident">worker_thread</span>));
<span class="kw">let</span> <span class="ident">job_b_ref</span> <span class="op">=</span> <span class="ident">job_b</span>.<span class="ident">as_job_ref</span>();
<span class="ident">worker_thread</span>.<span class="ident">push</span>(<span class="ident">job_b_ref</span>);
<span class="comment">// Execute task a; hopefully b gets stolen in the meantime.</span>
<span class="kw">let</span> <span class="ident">status_a</span> <span class="op">=</span> <span class="ident">unwind::halt_unwinding</span>(<span class="ident">call_a</span>(<span class="ident">oper_a</span>, <span class="ident">injected</span>));
<span class="kw">let</span> <span class="ident">result_a</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">status_a</span> {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="ident">v</span>,
<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="ident">join_recover_from_panic</span>(<span class="ident">worker_thread</span>, <span class="kw-2">&</span><span class="ident">job_b</span>.<span class="ident">latch</span>, <span class="ident">err</span>),
};
<span class="comment">// Now that task A has finished, try to pop job B from the</span>
<span class="comment">// local stack. It may already have been popped by job A; it</span>
<span class="comment">// may also have been stolen. There may also be some tasks</span>
<span class="comment">// pushed on top of it in the stack, and we will have to pop</span>
<span class="comment">// those off to get to it.</span>
<span class="kw">while</span> <span class="op">!</span><span class="ident">job_b</span>.<span class="ident">latch</span>.<span class="ident">probe</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">job</span>) <span class="op">=</span> <span class="ident">worker_thread</span>.<span class="ident">take_local_job</span>() {
<span class="kw">if</span> <span class="ident">job</span> <span class="op">=</span><span class="op">=</span> <span class="ident">job_b_ref</span> {
<span class="comment">// Found it! Let's run it.</span>
<span class="comment">//</span>
<span class="comment">// Note that this could panic, but it's ok if we unwind here.</span>
<span class="kw">let</span> <span class="ident">result_b</span> <span class="op">=</span> <span class="ident">job_b</span>.<span class="ident">run_inline</span>(<span class="ident">injected</span>);
<span class="kw">return</span> (<span class="ident">result_a</span>, <span class="ident">result_b</span>);
} <span class="kw">else</span> {
<span class="ident">worker_thread</span>.<span class="ident">execute</span>(<span class="ident">job</span>);
}
} <span class="kw">else</span> {
<span class="comment">// Local deque is empty. Time to steal from other</span>
<span class="comment">// threads.</span>
<span class="ident">worker_thread</span>.<span class="ident">wait_until</span>(<span class="kw-2">&</span><span class="ident">job_b</span>.<span class="ident">latch</span>);
<span class="macro">debug_assert!</span>(<span class="ident">job_b</span>.<span class="ident">latch</span>.<span class="ident">probe</span>());
<span class="kw">break</span>;
}
}
(<span class="ident">result_a</span>, <span class="ident">job_b</span>.<span class="ident">into_result</span>())
})
}
<span class="doccomment">/// If job A panics, we still cannot return until we are sure that job</span>
<span class="doccomment">/// B is complete. This is because it may contain references into the</span>
<span class="doccomment">/// enclosing stack frame(s).</span>
<span class="attribute">#[<span class="ident">cold</span>]</span> <span class="comment">// cold path</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">join_recover_from_panic</span>(
<span class="ident">worker_thread</span>: <span class="kw-2">&</span><span class="ident">WorkerThread</span>,
<span class="ident">job_b_latch</span>: <span class="kw-2">&</span><span class="ident">SpinLatch</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>,
<span class="ident">err</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span>,
) <span class="op">-</span><span class="op">></span> <span class="op">!</span> {
<span class="ident">worker_thread</span>.<span class="ident">wait_until</span>(<span class="ident">job_b_latch</span>);
<span class="ident">unwind::resume_unwinding</span>(<span class="ident">err</span>)
}
</pre></div>
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