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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! A load-balancing task pool.
//!
//! This differs in implementation from std::sync::TaskPool in that each job is
//! up for grabs by any of the child tasks in the pool.
//!
//
// This is based on the cargo task pool.
// https://github.com/rust-lang/cargo/blob/master/src/cargo/util/pool.rs
//
// The only difference is that a normal channel is used instead of a sync_channel.
//
use std::boxed::FnBox;
use std::sync::mpsc::{channel, Sender, Receiver};
use std::sync::{Arc, Mutex};
use task::spawn_named;
pub struct TaskPool {
tx: Sender<Box<FnBox() + Send + 'static>>,
}
impl TaskPool {
pub fn new(tasks: u32) -> TaskPool {
assert!(tasks > 0);
let (tx, rx) = channel();
let state = Arc::new(Mutex::new(rx));
for i in 0..tasks {
let state = state.clone();
spawn_named(
format!("TaskPoolWorker {}/{}", i + 1, tasks),
move || worker(&*state));
}
return TaskPool { tx: tx };
fn worker(rx: &Mutex<Receiver<Box<FnBox() + Send + 'static>>>) {
loop {
let job = rx.lock().unwrap().recv();
match job {
Ok(job) => job.call_box(()),
Err(..) => break,
}
}
}
}
pub fn execute<F>(&self, job: F)
where F: FnOnce() + Send + 'static
{
self.tx.send(Box::new(job)).unwrap();
}
}
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