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101 lines
2.6 KiB
Rust
101 lines
2.6 KiB
Rust
//Crossbeam should, but does not make this faster.
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//use crossbeam::channel::bounded;
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use std::{net::TcpStream, sync::mpsc, thread};
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type Job = (fn(TcpStream), TcpStream);
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type Sender = mpsc::Sender<Job>;
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//type Sender = crossbeam::channel::Sender<Job>;
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type Receiver = mpsc::Receiver<Job>;
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//type Receiver = crossbeam::channel::Receiver<Job>;
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pub struct ThreadPool {
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workers: Vec<Worker>,
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senders: Vec<Sender>,
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next_sender: usize,
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}
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impl ThreadPool {
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/// Create a new ThreadPool.
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///
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/// The size is the number of threads in the pool.
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///
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/// # Panics
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///
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/// The `new` function will panic if the size is zero.
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pub fn new(size: usize) -> ThreadPool {
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assert!(size > 0);
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let mut workers = Vec::with_capacity(size);
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let mut senders = Vec::with_capacity(size);
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for id in 0..size {
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//let (sender, receiver) = bounded(2);
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let (sender, receiver) = mpsc::channel();
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senders.push(sender);
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workers.push(Worker::new(id, receiver));
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}
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ThreadPool {
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workers,
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senders,
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next_sender: 0,
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}
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}
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/// round robin over available workers to ensure we never have to buffer requests
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pub fn execute(&mut self, handler: fn(TcpStream), stream: TcpStream) {
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let job = (handler, stream);
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self.senders[self.next_sender].send(job).unwrap();
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//self.senders[self.next_sender].try_send(job).unwrap();
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self.next_sender += 1;
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if self.next_sender == self.senders.len() {
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self.next_sender = 0;
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}
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}
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}
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impl Drop for ThreadPool {
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fn drop(&mut self) {
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self.senders.clear();
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for worker in &mut self.workers {
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println!("Shutting down worker {}", worker.id);
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if let Some(thread) = worker.thread.take() {
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thread.join().unwrap();
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}
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}
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}
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}
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struct Worker {
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id: usize,
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thread: Option<thread::JoinHandle<()>>,
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}
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impl Worker {
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fn new(id: usize, receiver: Receiver) -> Worker {
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let thread = thread::spawn(move || Self::work(receiver));
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Worker {
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id,
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thread: Some(thread),
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}
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}
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fn work(receiver: Receiver) {
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loop {
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let message = receiver.recv();
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match message {
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Ok((handler, stream)) => {
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// println!("Worker got a job; executing.");
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handler(stream);
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}
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Err(_) => {
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// println!("Worker disconnected; shutting down.");
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break;
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}
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}
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}
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}
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}
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