summaryrefslogtreecommitdiffstats
path: root/third_party/rust/futures-cpupool
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/rust/futures-cpupool')
-rw-r--r--third_party/rust/futures-cpupool/.cargo-checksum.json1
-rw-r--r--third_party/rust/futures-cpupool/Cargo.toml32
-rw-r--r--third_party/rust/futures-cpupool/LICENSE-APACHE201
-rw-r--r--third_party/rust/futures-cpupool/LICENSE-MIT25
-rw-r--r--third_party/rust/futures-cpupool/README.md36
-rw-r--r--third_party/rust/futures-cpupool/src/lib.rs450
-rw-r--r--third_party/rust/futures-cpupool/tests/smoke.rs110
7 files changed, 855 insertions, 0 deletions
diff --git a/third_party/rust/futures-cpupool/.cargo-checksum.json b/third_party/rust/futures-cpupool/.cargo-checksum.json
new file mode 100644
index 0000000000..123f51fc57
--- /dev/null
+++ b/third_party/rust/futures-cpupool/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"d65d12c309bb5af442353ceb79339c2d426b1ed643f5eddee14ad22637225ca2","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"69036b033e4bb951821964dbc3d9b1efe6913a6e36d9c1f206de4035a1a85cc4","README.md":"09c5f4bacff34b3f7e1969f5b9590c062a8aabac7c2442944eab1d2fc1301373","src/lib.rs":"2bffe7435a2c13028978955882338fbb9df3644f725a7e9d27b5f1495e3e9f90","tests/smoke.rs":"4c07aad02b0dd17f4723f3be1abbe320629b9e0756c885b44cbc1268141668f1"},"package":"ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"} \ No newline at end of file
diff --git a/third_party/rust/futures-cpupool/Cargo.toml b/third_party/rust/futures-cpupool/Cargo.toml
new file mode 100644
index 0000000000..4bfc90332d
--- /dev/null
+++ b/third_party/rust/futures-cpupool/Cargo.toml
@@ -0,0 +1,32 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g. crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+name = "futures-cpupool"
+version = "0.1.8"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+description = "An implementation of thread pools which hand out futures to the results of the\ncomputation on the threads themselves.\n"
+homepage = "https://github.com/alexcrichton/futures-rs"
+documentation = "https://docs.rs/futures-cpupool"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/alexcrichton/futures-rs"
+[dependencies.futures]
+version = "0.1"
+features = ["use_std"]
+default-features = false
+
+[dependencies.num_cpus]
+version = "1.0"
+
+[features]
+default = ["with-deprecated"]
+with-deprecated = ["futures/with-deprecated"]
diff --git a/third_party/rust/futures-cpupool/LICENSE-APACHE b/third_party/rust/futures-cpupool/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/third_party/rust/futures-cpupool/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
+ control with that entity. For the purposes of this definition,
+ "control" means (i) the power, direct or indirect, to cause the
+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
+ replaced with your own identifying information. (Don't include
+ the brackets!) The text should be enclosed in the appropriate
+ comment syntax for the file format. We also recommend that a
+ file or class name and description of purpose be included on the
+ same "printed page" as the copyright notice for easier
+ identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/third_party/rust/futures-cpupool/LICENSE-MIT b/third_party/rust/futures-cpupool/LICENSE-MIT
new file mode 100644
index 0000000000..28e630cf40
--- /dev/null
+++ b/third_party/rust/futures-cpupool/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2016 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/futures-cpupool/README.md b/third_party/rust/futures-cpupool/README.md
new file mode 100644
index 0000000000..b022994fb5
--- /dev/null
+++ b/third_party/rust/futures-cpupool/README.md
@@ -0,0 +1,36 @@
+# futures-cpupool
+
+A library for creating futures representing work happening concurrently on a
+dedicated thread pool.
+
+[![Build Status](https://travis-ci.org/alexcrichton/futures-rs.svg?branch=master)](https://travis-ci.org/alexcrichton/futures-rs)
+[![Build status](https://ci.appveyor.com/api/projects/status/yl5w3ittk4kggfsh?svg=true)](https://ci.appveyor.com/project/alexcrichton/futures-rs)
+
+[Documentation](https://docs.rs/futures-cpupool)
+
+## Usage
+
+First, add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+futures = "0.1"
+futures-cpupool = "0.1"
+```
+
+Next, add this to your crate:
+
+```rust
+extern crate futures;
+extern crate futures_cpupool;
+
+use futures_cpupool::CpuPool;
+```
+
+# License
+
+`futures-cpupool` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), with portions covered by various
+BSD-like licenses.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.
diff --git a/third_party/rust/futures-cpupool/src/lib.rs b/third_party/rust/futures-cpupool/src/lib.rs
new file mode 100644
index 0000000000..0614368ba3
--- /dev/null
+++ b/third_party/rust/futures-cpupool/src/lib.rs
@@ -0,0 +1,450 @@
+//! A simple crate for executing work on a thread pool, and getting back a
+//! future.
+//!
+//! This crate provides a simple thread pool abstraction for running work
+//! externally from the current thread that's running. An instance of `Future`
+//! is handed back to represent that the work may be done later, and further
+//! computations can be chained along with it as well.
+//!
+//! ```rust
+//! extern crate futures;
+//! extern crate futures_cpupool;
+//!
+//! use futures::Future;
+//! use futures_cpupool::CpuPool;
+//!
+//! # fn long_running_future(a: u32) -> Box<futures::future::Future<Item = u32, Error = ()> + Send> {
+//! # Box::new(futures::future::result(Ok(a)))
+//! # }
+//! # fn main() {
+//!
+//! // Create a worker thread pool with four threads
+//! let pool = CpuPool::new(4);
+//!
+//! // Execute some work on the thread pool, optionally closing over data.
+//! let a = pool.spawn(long_running_future(2));
+//! let b = pool.spawn(long_running_future(100));
+//!
+//! // Express some further computation once the work is completed on the thread
+//! // pool.
+//! let c = a.join(b).map(|(a, b)| a + b).wait().unwrap();
+//!
+//! // Print out the result
+//! println!("{:?}", c);
+//! # }
+//! ```
+
+#![deny(missing_docs)]
+#![deny(missing_debug_implementations)]
+
+extern crate futures;
+extern crate num_cpus;
+
+use std::panic::{self, AssertUnwindSafe};
+use std::sync::{Arc, Mutex};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+use std::sync::mpsc;
+use std::thread;
+use std::fmt;
+
+use futures::{IntoFuture, Future, Poll, Async};
+use futures::future::{lazy, Executor, ExecuteError};
+use futures::sync::oneshot::{channel, Sender, Receiver};
+use futures::executor::{self, Run, Executor as OldExecutor};
+
+/// A thread pool intended to run CPU intensive work.
+///
+/// This thread pool will hand out futures representing the completed work
+/// that happens on the thread pool itself, and the futures can then be later
+/// composed with other work as part of an overall computation.
+///
+/// The worker threads associated with a thread pool are kept alive so long as
+/// there is an open handle to the `CpuPool` or there is work running on them. Once
+/// all work has been drained and all references have gone away the worker
+/// threads will be shut down.
+///
+/// Currently `CpuPool` implements `Clone` which just clones a new reference to
+/// the underlying thread pool.
+///
+/// **Note:** if you use CpuPool inside a library it's better accept a
+/// `Builder` object for thread configuration rather than configuring just
+/// pool size. This not only future proof for other settings but also allows
+/// user to attach monitoring tools to lifecycle hooks.
+pub struct CpuPool {
+ inner: Arc<Inner>,
+}
+
+/// Thread pool configuration object
+///
+/// Builder starts with a number of workers equal to the number
+/// of CPUs on the host. But you can change it until you call `create()`.
+pub struct Builder {
+ pool_size: usize,
+ stack_size: usize,
+ name_prefix: Option<String>,
+ after_start: Option<Arc<Fn() + Send + Sync>>,
+ before_stop: Option<Arc<Fn() + Send + Sync>>,
+}
+
+struct MySender<F, T> {
+ fut: F,
+ tx: Option<Sender<T>>,
+ keep_running_flag: Arc<AtomicBool>,
+}
+
+trait AssertSendSync: Send + Sync {}
+impl AssertSendSync for CpuPool {}
+
+struct Inner {
+ tx: Mutex<mpsc::Sender<Message>>,
+ rx: Mutex<mpsc::Receiver<Message>>,
+ cnt: AtomicUsize,
+ size: usize,
+}
+
+impl fmt::Debug for CpuPool {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ f.debug_struct("CpuPool")
+ .field("size", &self.inner.size)
+ .finish()
+ }
+}
+
+impl fmt::Debug for Builder {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ f.debug_struct("Builder")
+ .field("pool_size", &self.pool_size)
+ .field("name_prefix", &self.name_prefix)
+ .finish()
+ }
+}
+
+/// The type of future returned from the `CpuPool::spawn` function, which
+/// proxies the futures running on the thread pool.
+///
+/// This future will resolve in the same way as the underlying future, and it
+/// will propagate panics.
+#[must_use]
+#[derive(Debug)]
+pub struct CpuFuture<T, E> {
+ inner: Receiver<thread::Result<Result<T, E>>>,
+ keep_running_flag: Arc<AtomicBool>,
+}
+
+enum Message {
+ Run(Run),
+ Close,
+}
+
+impl CpuPool {
+ /// Creates a new thread pool with `size` worker threads associated with it.
+ ///
+ /// The returned handle can use `execute` to run work on this thread pool,
+ /// and clones can be made of it to get multiple references to the same
+ /// thread pool.
+ ///
+ /// This is a shortcut for:
+ ///
+ /// ```rust
+ /// # use futures_cpupool::{Builder, CpuPool};
+ /// #
+ /// # fn new(size: usize) -> CpuPool {
+ /// Builder::new().pool_size(size).create()
+ /// # }
+ /// ```
+ ///
+ /// # Panics
+ ///
+ /// Panics if `size == 0`.
+ pub fn new(size: usize) -> CpuPool {
+ Builder::new().pool_size(size).create()
+ }
+
+ /// Creates a new thread pool with a number of workers equal to the number
+ /// of CPUs on the host.
+ ///
+ /// This is a shortcut for:
+ ///
+ /// ```rust
+ /// # use futures_cpupool::{Builder, CpuPool};
+ /// #
+ /// # fn new_num_cpus() -> CpuPool {
+ /// Builder::new().create()
+ /// # }
+ /// ```
+ pub fn new_num_cpus() -> CpuPool {
+ Builder::new().create()
+ }
+
+ /// Spawns a future to run on this thread pool, returning a future
+ /// representing the produced value.
+ ///
+ /// This function will execute the future `f` on the associated thread
+ /// pool, and return a future representing the finished computation. The
+ /// returned future serves as a proxy to the computation that `F` is
+ /// running.
+ ///
+ /// To simply run an arbitrary closure on a thread pool and extract the
+ /// result, you can use the `future::lazy` combinator to defer work to
+ /// executing on the thread pool itself.
+ ///
+ /// Note that if the future `f` panics it will be caught by default and the
+ /// returned future will propagate the panic. That is, panics will not tear
+ /// down the thread pool and will be propagated to the returned future's
+ /// `poll` method if queried.
+ ///
+ /// If the returned future is dropped then this `CpuPool` will attempt to
+ /// cancel the computation, if possible. That is, if the computation is in
+ /// the middle of working, it will be interrupted when possible.
+ pub fn spawn<F>(&self, f: F) -> CpuFuture<F::Item, F::Error>
+ where F: Future + Send + 'static,
+ F::Item: Send + 'static,
+ F::Error: Send + 'static,
+ {
+ let (tx, rx) = channel();
+ let keep_running_flag = Arc::new(AtomicBool::new(false));
+ // AssertUnwindSafe is used here because `Send + 'static` is basically
+ // an alias for an implementation of the `UnwindSafe` trait but we can't
+ // express that in the standard library right now.
+ let sender = MySender {
+ fut: AssertUnwindSafe(f).catch_unwind(),
+ tx: Some(tx),
+ keep_running_flag: keep_running_flag.clone(),
+ };
+ executor::spawn(sender).execute(self.inner.clone());
+ CpuFuture { inner: rx , keep_running_flag: keep_running_flag.clone() }
+ }
+
+ /// Spawns a closure on this thread pool.
+ ///
+ /// This function is a convenience wrapper around the `spawn` function above
+ /// for running a closure wrapped in `future::lazy`. It will spawn the
+ /// function `f` provided onto the thread pool, and continue to run the
+ /// future returned by `f` on the thread pool as well.
+ ///
+ /// The returned future will be a handle to the result produced by the
+ /// future that `f` returns.
+ pub fn spawn_fn<F, R>(&self, f: F) -> CpuFuture<R::Item, R::Error>
+ where F: FnOnce() -> R + Send + 'static,
+ R: IntoFuture + 'static,
+ R::Future: Send + 'static,
+ R::Item: Send + 'static,
+ R::Error: Send + 'static,
+ {
+ self.spawn(lazy(f))
+ }
+}
+
+impl<F> Executor<F> for CpuPool
+ where F: Future<Item = (), Error = ()> + Send + 'static,
+{
+ fn execute(&self, future: F) -> Result<(), ExecuteError<F>> {
+ executor::spawn(future).execute(self.inner.clone());
+ Ok(())
+ }
+}
+
+impl Inner {
+ fn send(&self, msg: Message) {
+ self.tx.lock().unwrap().send(msg).unwrap();
+ }
+
+ fn work(&self, after_start: Option<Arc<Fn() + Send + Sync>>, before_stop: Option<Arc<Fn() + Send + Sync>>) {
+ after_start.map(|fun| fun());
+ loop {
+ let msg = self.rx.lock().unwrap().recv().unwrap();
+ match msg {
+ Message::Run(r) => r.run(),
+ Message::Close => break,
+ }
+ }
+ before_stop.map(|fun| fun());
+ }
+}
+
+impl Clone for CpuPool {
+ fn clone(&self) -> CpuPool {
+ self.inner.cnt.fetch_add(1, Ordering::Relaxed);
+ CpuPool { inner: self.inner.clone() }
+ }
+}
+
+impl Drop for CpuPool {
+ fn drop(&mut self) {
+ if self.inner.cnt.fetch_sub(1, Ordering::Relaxed) == 1 {
+ for _ in 0..self.inner.size {
+ self.inner.send(Message::Close);
+ }
+ }
+ }
+}
+
+impl OldExecutor for Inner {
+ fn execute(&self, run: Run) {
+ self.send(Message::Run(run))
+ }
+}
+
+impl<T, E> CpuFuture<T, E> {
+ /// Drop this future without canceling the underlying future.
+ ///
+ /// When `CpuFuture` is dropped, `CpuPool` will try to abort the underlying
+ /// future. This function can be used when user wants to drop but keep
+ /// executing the underlying future.
+ pub fn forget(self) {
+ self.keep_running_flag.store(true, Ordering::SeqCst);
+ }
+}
+
+impl<T: Send + 'static, E: Send + 'static> Future for CpuFuture<T, E> {
+ type Item = T;
+ type Error = E;
+
+ fn poll(&mut self) -> Poll<T, E> {
+ match self.inner.poll().expect("cannot poll CpuFuture twice") {
+ Async::Ready(Ok(Ok(e))) => Ok(e.into()),
+ Async::Ready(Ok(Err(e))) => Err(e),
+ Async::Ready(Err(e)) => panic::resume_unwind(e),
+ Async::NotReady => Ok(Async::NotReady),
+ }
+ }
+}
+
+impl<F: Future> Future for MySender<F, Result<F::Item, F::Error>> {
+ type Item = ();
+ type Error = ();
+
+ fn poll(&mut self) -> Poll<(), ()> {
+ if let Ok(Async::Ready(_)) = self.tx.as_mut().unwrap().poll_cancel() {
+ if !self.keep_running_flag.load(Ordering::SeqCst) {
+ // Cancelled, bail out
+ return Ok(().into())
+ }
+ }
+
+ let res = match self.fut.poll() {
+ Ok(Async::Ready(e)) => Ok(e),
+ Ok(Async::NotReady) => return Ok(Async::NotReady),
+ Err(e) => Err(e),
+ };
+
+ // if the receiving end has gone away then that's ok, we just ignore the
+ // send error here.
+ drop(self.tx.take().unwrap().send(res));
+ Ok(Async::Ready(()))
+ }
+}
+
+impl Builder {
+ /// Create a builder a number of workers equal to the number
+ /// of CPUs on the host.
+ pub fn new() -> Builder {
+ Builder {
+ pool_size: num_cpus::get(),
+ stack_size: 0,
+ name_prefix: None,
+ after_start: None,
+ before_stop: None,
+ }
+ }
+
+ /// Set size of a future CpuPool
+ ///
+ /// The size of a thread pool is the number of worker threads spawned
+ pub fn pool_size(&mut self, size: usize) -> &mut Self {
+ self.pool_size = size;
+ self
+ }
+
+ /// Set stack size of threads in the pool.
+ pub fn stack_size(&mut self, stack_size: usize) -> &mut Self {
+ self.stack_size = stack_size;
+ self
+ }
+
+ /// Set thread name prefix of a future CpuPool
+ ///
+ /// Thread name prefix is used for generating thread names. For example, if prefix is
+ /// `my-pool-`, then threads in the pool will get names like `my-pool-1` etc.
+ pub fn name_prefix<S: Into<String>>(&mut self, name_prefix: S) -> &mut Self {
+ self.name_prefix = Some(name_prefix.into());
+ self
+ }
+
+ /// Execute function `f` right after each thread is started but before
+ /// running any jobs on it.
+ ///
+ /// This is initially intended for bookkeeping and monitoring uses.
+ /// The `f` will be deconstructed after the `builder` is deconstructed
+ /// and all threads in the pool has executed it.
+ pub fn after_start<F>(&mut self, f: F) -> &mut Self
+ where F: Fn() + Send + Sync + 'static
+ {
+ self.after_start = Some(Arc::new(f));
+ self
+ }
+
+ /// Execute function `f` before each worker thread stops.
+ ///
+ /// This is initially intended for bookkeeping and monitoring uses.
+ /// The `f` will be deconstructed after the `builder` is deconstructed
+ /// and all threads in the pool has executed it.
+ pub fn before_stop<F>(&mut self, f: F) -> &mut Self
+ where F: Fn() + Send + Sync + 'static
+ {
+ self.before_stop = Some(Arc::new(f));
+ self
+ }
+
+ /// Create CpuPool with configured parameters
+ ///
+ /// # Panics
+ ///
+ /// Panics if `pool_size == 0`.
+ pub fn create(&mut self) -> CpuPool {
+ let (tx, rx) = mpsc::channel();
+ let pool = CpuPool {
+ inner: Arc::new(Inner {
+ tx: Mutex::new(tx),
+ rx: Mutex::new(rx),
+ cnt: AtomicUsize::new(1),
+ size: self.pool_size,
+ }),
+ };
+ assert!(self.pool_size > 0);
+
+ for counter in 0..self.pool_size {
+ let inner = pool.inner.clone();
+ let after_start = self.after_start.clone();
+ let before_stop = self.before_stop.clone();
+ let mut thread_builder = thread::Builder::new();
+ if let Some(ref name_prefix) = self.name_prefix {
+ thread_builder = thread_builder.name(format!("{}{}", name_prefix, counter));
+ }
+ if self.stack_size > 0 {
+ thread_builder = thread_builder.stack_size(self.stack_size);
+ }
+ thread_builder.spawn(move || inner.work(after_start, before_stop)).unwrap();
+ }
+ return pool
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use std::sync::mpsc;
+
+ #[test]
+ fn test_drop_after_start() {
+ let (tx, rx) = mpsc::sync_channel(2);
+ let _cpu_pool = Builder::new()
+ .pool_size(2)
+ .after_start(move || tx.send(1).unwrap()).create();
+
+ // After Builder is deconstructed, the tx should be droped
+ // so that we can use rx as an iterator.
+ let count = rx.into_iter().count();
+ assert_eq!(count, 2);
+ }
+}
diff --git a/third_party/rust/futures-cpupool/tests/smoke.rs b/third_party/rust/futures-cpupool/tests/smoke.rs
new file mode 100644
index 0000000000..1b267f2f02
--- /dev/null
+++ b/third_party/rust/futures-cpupool/tests/smoke.rs
@@ -0,0 +1,110 @@
+extern crate futures;
+extern crate futures_cpupool;
+
+use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
+use std::thread;
+use std::time::Duration;
+
+use futures::future::Future;
+use futures_cpupool::{CpuPool, Builder};
+
+fn done<T: Send + 'static>(t: T) -> Box<Future<Item = T, Error = ()> + Send> {
+ Box::new(futures::future::ok(t))
+}
+
+#[test]
+fn join() {
+ let pool = CpuPool::new(2);
+ let a = pool.spawn(done(1));
+ let b = pool.spawn(done(2));
+ let res = a.join(b).map(|(a, b)| a + b).wait();
+
+ assert_eq!(res.unwrap(), 3);
+}
+
+#[test]
+fn select() {
+ let pool = CpuPool::new(2);
+ let a = pool.spawn(done(1));
+ let b = pool.spawn(done(2));
+ let (item1, next) = a.select(b).wait().ok().unwrap();
+ let item2 = next.wait().unwrap();
+
+ assert!(item1 != item2);
+ assert!((item1 == 1 && item2 == 2) || (item1 == 2 && item2 == 1));
+}
+
+#[test]
+fn threads_go_away() {
+ static CNT: AtomicUsize = ATOMIC_USIZE_INIT;
+
+ struct A;
+
+ impl Drop for A {
+ fn drop(&mut self) {
+ CNT.fetch_add(1, Ordering::SeqCst);
+ }
+ }
+
+ thread_local!(static FOO: A = A);
+
+ let pool = CpuPool::new(2);
+ let _handle = pool.spawn_fn(|| {
+ FOO.with(|_| ());
+ Ok::<(), ()>(())
+ });
+ drop(pool);
+
+ for _ in 0..100 {
+ if CNT.load(Ordering::SeqCst) == 1 {
+ return
+ }
+ thread::sleep(Duration::from_millis(10));
+ }
+ panic!("thread didn't exit");
+}
+
+#[test]
+fn lifecycle_test() {
+ static NUM_STARTS: AtomicUsize = ATOMIC_USIZE_INIT;
+ static NUM_STOPS: AtomicUsize = ATOMIC_USIZE_INIT;
+
+ fn after_start() {
+ NUM_STARTS.fetch_add(1, Ordering::SeqCst);
+ }
+
+ fn before_stop() {
+ NUM_STOPS.fetch_add(1, Ordering::SeqCst);
+ }
+
+ let pool = Builder::new()
+ .pool_size(4)
+ .after_start(after_start)
+ .before_stop(before_stop)
+ .create();
+ let _handle = pool.spawn_fn(|| {
+ Ok::<(), ()>(())
+ });
+ drop(pool);
+
+ for _ in 0..100 {
+ if NUM_STOPS.load(Ordering::SeqCst) == 4 {
+ assert_eq!(NUM_STARTS.load(Ordering::SeqCst), 4);
+ return;
+ }
+ thread::sleep(Duration::from_millis(10));
+ }
+ panic!("thread didn't exit");
+}
+
+#[test]
+fn thread_name() {
+ let pool = Builder::new()
+ .name_prefix("my-pool-")
+ .create();
+ let future = pool.spawn_fn(|| {
+ assert!(thread::current().name().unwrap().starts_with("my-pool-"));
+ Ok::<(), ()>(())
+ });
+ let _ = future.wait();
+}