futures-cpupool-0.1.8/Cargo.toml.orig01006640001750000175000000001221132226231440016001 0ustar0000000000000000[package] name = "futures-cpupool" version = "0.1.8" authors = ["Alex Crichton "] license = "MIT/Apache-2.0" repository = "https://github.com/alexcrichton/futures-rs" homepage = "https://github.com/alexcrichton/futures-rs" documentation = "https://docs.rs/futures-cpupool" description = """ An implementation of thread pools which hand out futures to the results of the computation on the threads themselves. """ [dependencies] num_cpus = "1.0" [dependencies.futures] path = ".." version = "0.1" default-features = false features = ["use_std"] [features] default = ["with-deprecated"] with-deprecated = ["futures/with-deprecated"] futures-cpupool-0.1.8/Cargo.toml0000644000000022250011234 0ustar00# 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 "] 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"] futures-cpupool-0.1.8/LICENSE-APACHE01006640001750000175000000025137130533740110015050 0ustar0000000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. futures-cpupool-0.1.8/LICENSE-MIT01006640001750000175000000002041130533740110014545 0ustar0000000000000000Copyright (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. futures-cpupool-0.1.8/README.md01006640001750000175000000001635130533740110014400 0ustar0000000000000000# 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. futures-cpupool-0.1.8/src/lib.rs01006640001750000175000000034545132226230600015031 0ustar0000000000000000//! 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 + 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, } /// 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, after_start: Option>, before_stop: Option>, } struct MySender { fut: F, tx: Option>, keep_running_flag: Arc, } trait AssertSendSync: Send + Sync {} impl AssertSendSync for CpuPool {} struct Inner { tx: Mutex>, rx: Mutex>, 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 { inner: Receiver>>, keep_running_flag: Arc, } 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(&self, f: F) -> CpuFuture 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(&self, f: F) -> CpuFuture 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 Executor for CpuPool where F: Future + Send + 'static, { fn execute(&self, future: F) -> Result<(), ExecuteError> { 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>, before_stop: Option>) { 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 CpuFuture { /// 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 Future for CpuFuture { type Item = T; type Error = E; fn poll(&mut self) -> Poll { 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 Future for MySender> { 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>(&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(&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(&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); } } futures-cpupool-0.1.8/tests/smoke.rs01006640001750000175000000004747132226230600015755 0ustar0000000000000000extern 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: T) -> Box + 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(); }