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 </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::latch::Latch;
 <span class="kw">use </span><span class="kw">crate</span>::unwind;
 <span class="kw">use </span>crossbeam_deque::{Injector, Steal};
 <span class="kw">use </span>std::any::Any;
 <span class="kw">use </span>std::cell::UnsafeCell;
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::sync::Arc;

 <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>JobResult&lt;T&gt; {
     <span class="prelude-val">None</span>,
     <span class="prelude-val">Ok</span>(T),
     Panic(Box&lt;<span class="kw">dyn </span>Any + Send&gt;),
 }

 <span class="doccomment">/// A `Job` is used to advertise work for other threads that they may
 /// want to steal. In accordance with time honored tradition, jobs are
 /// arranged in a deque, so that thieves can take from the top of the
 /// deque while the main worker manages the bottom of the deque. This
 /// deque is managed by the `thread_pool` module.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">trait </span>Job {
     <span class="doccomment">/// Unsafe: this may be called from a different thread than the one
     /// which scheduled the job, so the implementer must ensure the
     /// appropriate traits are met, whether `Send`, `Sync`, or both.
     </span><span class="kw">unsafe fn </span>execute(this: <span class="kw-2">*const </span>());
 }

 <span class="doccomment">/// Effectively a Job trait object. Each JobRef **must** be executed
 /// exactly once, or else data may leak.
 ///
 /// Internally, we store the job&#39;s data in a `*const ()` pointer.  The
 /// true type is something like `*const StackJob&lt;...&gt;`, but we hide
 /// it. We also carry the &quot;execute fn&quot; from the `Job` trait.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>JobRef {
     pointer: <span class="kw-2">*const </span>(),
     execute_fn: <span class="kw">unsafe fn</span>(<span class="kw-2">*const </span>()),
 }

 <span class="kw">unsafe impl </span>Send <span class="kw">for </span>JobRef {}
 <span class="kw">unsafe impl </span>Sync <span class="kw">for </span>JobRef {}

 <span class="kw">impl </span>JobRef {
     <span class="doccomment">/// Unsafe: caller asserts that `data` will remain valid until the
     /// job is executed.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>new&lt;T&gt;(data: <span class="kw-2">*const </span>T) -&gt; JobRef
     <span class="kw">where
         </span>T: Job,
     {
         <span class="comment">// erase types:
         </span>JobRef {
             pointer: data <span class="kw">as </span><span class="kw-2">*const </span>(),
             execute_fn: &lt;T <span class="kw">as </span>Job&gt;::execute,
         }
     }

     <span class="doccomment">/// Returns an opaque handle that can be saved and compared,
     /// without making `JobRef` itself `Copy + Eq`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">impl </span>Eq {
         (<span class="self">self</span>.pointer, <span class="self">self</span>.execute_fn)
     }

     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>execute(<span class="self">self</span>) {
         (<span class="self">self</span>.execute_fn)(<span class="self">self</span>.pointer)
     }
 }

 <span class="doccomment">/// A job that will be owned by a stack slot. This means that when it
 /// executes it need not free any heap data, the cleanup occurs when
 /// the stack frame is later popped.  The function parameter indicates
 /// `true` if the job was stolen -- executed on a different thread.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>StackJob&lt;L, F, R&gt;
 <span class="kw">where
     </span>L: Latch + Sync,
     F: FnOnce(bool) -&gt; R + Send,
     R: Send,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) latch: L,
     func: UnsafeCell&lt;<span class="prelude-ty">Option</span>&lt;F&gt;&gt;,
     result: UnsafeCell&lt;JobResult&lt;R&gt;&gt;,
 }

 <span class="kw">impl</span>&lt;L, F, R&gt; StackJob&lt;L, F, R&gt;
 <span class="kw">where
     </span>L: Latch + Sync,
     F: FnOnce(bool) -&gt; R + Send,
     R: Send,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(func: F, latch: L) -&gt; StackJob&lt;L, F, R&gt; {
         StackJob {
             latch,
             func: UnsafeCell::new(<span class="prelude-val">Some</span>(func)),
             result: UnsafeCell::new(JobResult::None),
         }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>as_job_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; JobRef {
         JobRef::new(<span class="self">self</span>)
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>run_inline(<span class="self">self</span>, stolen: bool) -&gt; R {
         <span class="self">self</span>.func.into_inner().unwrap()(stolen)
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>into_result(<span class="self">self</span>) -&gt; R {
         <span class="self">self</span>.result.into_inner().into_return_value()
     }
 }

 <span class="kw">impl</span>&lt;L, F, R&gt; Job <span class="kw">for </span>StackJob&lt;L, F, R&gt;
 <span class="kw">where
     </span>L: Latch + Sync,
     F: FnOnce(bool) -&gt; R + Send,
     R: Send,
 {
     <span class="kw">unsafe fn </span>execute(this: <span class="kw-2">*const </span>()) {
         <span class="kw">let </span>this = <span class="kw-2">&amp;*</span>(this <span class="kw">as </span><span class="kw-2">*const </span><span class="self">Self</span>);
         <span class="kw">let </span>abort = unwind::AbortIfPanic;
         <span class="kw">let </span>func = (<span class="kw-2">*</span>this.func.get()).take().unwrap();
         (<span class="kw-2">*</span>this.result.get()) = JobResult::call(func);
         Latch::set(<span class="kw-2">&amp;</span>this.latch);
         mem::forget(abort);
     }
 }

 <span class="doccomment">/// Represents a job stored in the heap. Used to implement
 /// `scope`. Unlike `StackJob`, when executed, `HeapJob` simply
 /// invokes a closure, which then triggers the appropriate logic to
 /// signal that the job executed.
 ///
 /// (Probably `StackJob` should be refactored in a similar fashion.)
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>HeapJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: FnOnce() + Send,
 {
     job: BODY,
 }

 <span class="kw">impl</span>&lt;BODY&gt; HeapJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: FnOnce() + Send,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(job: BODY) -&gt; Box&lt;<span class="self">Self</span>&gt; {
         Box::new(HeapJob { job })
     }

     <span class="doccomment">/// Creates a `JobRef` from this job -- note that this hides all
     /// lifetimes, so it is up to you to ensure that this JobRef
     /// doesn&#39;t outlive any data that it closes over.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>into_job_ref(<span class="self">self</span>: Box&lt;<span class="self">Self</span>&gt;) -&gt; JobRef {
         JobRef::new(Box::into_raw(<span class="self">self</span>))
     }

     <span class="doccomment">/// Creates a static `JobRef` from this job.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_static_job_ref(<span class="self">self</span>: Box&lt;<span class="self">Self</span>&gt;) -&gt; JobRef
     <span class="kw">where
         </span>BODY: <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">unsafe </span>{ <span class="self">self</span>.into_job_ref() }
     }
 }

 <span class="kw">impl</span>&lt;BODY&gt; Job <span class="kw">for </span>HeapJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: FnOnce() + Send,
 {
     <span class="kw">unsafe fn </span>execute(this: <span class="kw-2">*const </span>()) {
         <span class="kw">let </span>this = Box::from_raw(this <span class="kw">as </span><span class="kw-2">*mut </span><span class="self">Self</span>);
         (this.job)();
     }
 }

 <span class="doccomment">/// Represents a job stored in an `Arc` -- like `HeapJob`, but may
 /// be turned into multiple `JobRef`s and called multiple times.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>ArcJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: Fn() + Send + Sync,
 {
     job: BODY,
 }

 <span class="kw">impl</span>&lt;BODY&gt; ArcJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: Fn() + Send + Sync,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(job: BODY) -&gt; Arc&lt;<span class="self">Self</span>&gt; {
         Arc::new(ArcJob { job })
     }

     <span class="doccomment">/// Creates a `JobRef` from this job -- note that this hides all
     /// lifetimes, so it is up to you to ensure that this JobRef
     /// doesn&#39;t outlive any data that it closes over.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>as_job_ref(this: <span class="kw-2">&amp;</span>Arc&lt;<span class="self">Self</span>&gt;) -&gt; JobRef {
         JobRef::new(Arc::into_raw(Arc::clone(this)))
     }

     <span class="doccomment">/// Creates a static `JobRef` from this job.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>as_static_job_ref(this: <span class="kw-2">&amp;</span>Arc&lt;<span class="self">Self</span>&gt;) -&gt; JobRef
     <span class="kw">where
         </span>BODY: <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">unsafe </span>{ <span class="self">Self</span>::as_job_ref(this) }
     }
 }

 <span class="kw">impl</span>&lt;BODY&gt; Job <span class="kw">for </span>ArcJob&lt;BODY&gt;
 <span class="kw">where
     </span>BODY: Fn() + Send + Sync,
 {
     <span class="kw">unsafe fn </span>execute(this: <span class="kw-2">*const </span>()) {
         <span class="kw">let </span>this = Arc::from_raw(this <span class="kw">as </span><span class="kw-2">*mut </span><span class="self">Self</span>);
         (this.job)();
     }
 }

 <span class="kw">impl</span>&lt;T&gt; JobResult&lt;T&gt; {
     <span class="kw">fn </span>call(func: <span class="kw">impl </span>FnOnce(bool) -&gt; T) -&gt; <span class="self">Self </span>{
         <span class="kw">match </span>unwind::halt_unwinding(|| func(<span class="bool-val">true</span>)) {
             <span class="prelude-val">Ok</span>(x) =&gt; JobResult::Ok(x),
             <span class="prelude-val">Err</span>(x) =&gt; JobResult::Panic(x),
         }
     }

     <span class="doccomment">/// Convert the `JobResult` for a job that has finished (and hence
     /// its JobResult is populated) into its return value.
     ///
     /// NB. This will panic if the job panicked.
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_return_value(<span class="self">self</span>) -&gt; T {
         <span class="kw">match </span><span class="self">self </span>{
             JobResult::None =&gt; <span class="macro">unreachable!</span>(),
             JobResult::Ok(x) =&gt; x,
             JobResult::Panic(x) =&gt; unwind::resume_unwinding(x),
         }
     }
 }

 <span class="doccomment">/// Indirect queue to provide FIFO job priority.
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>JobFifo {
     inner: Injector&lt;JobRef&gt;,
 }

 <span class="kw">impl </span>JobFifo {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new() -&gt; <span class="self">Self </span>{
         JobFifo {
             inner: Injector::new(),
         }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">unsafe fn </span>push(<span class="kw-2">&amp;</span><span class="self">self</span>, job_ref: JobRef) -&gt; JobRef {
         <span class="comment">// A little indirection ensures that spawns are always prioritized in FIFO order.  The
         // jobs in a thread&#39;s deque may be popped from the back (LIFO) or stolen from the front
         // (FIFO), but either way they will end up popping from the front of this queue.
         </span><span class="self">self</span>.inner.push(job_ref);
         JobRef::new(<span class="self">self</span>)
     }
 }

 <span class="kw">impl </span>Job <span class="kw">for </span>JobFifo {
     <span class="kw">unsafe fn </span>execute(this: <span class="kw-2">*const </span>()) {
         <span class="comment">// We &quot;execute&quot; a queue by executing its first job, FIFO.
         </span><span class="kw">let </span>this = <span class="kw-2">&amp;*</span>(this <span class="kw">as </span><span class="kw-2">*const </span><span class="self">Self</span>);
         <span class="kw">loop </span>{
             <span class="kw">match </span>this.inner.steal() {
                 Steal::Success(job_ref) =&gt; <span class="kw">break </span>job_ref.execute(),
                 Steal::Empty =&gt; <span class="macro">panic!</span>(<span class="string">&quot;FIFO is empty&quot;</span>),
                 Steal::Retry =&gt; {}
             }
         }
     }
 }
 </code></pre></div>
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