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- use std::thread;
- use std::sync::{mpsc, Mutex, Arc};
-
- enum Message {
- NewJob(Job),
- Terminate
- }
-
- pub struct ThreadPool{
- workers: Vec<Worker>,
- sender: mpsc::Sender<Message>,
- }
-
- type Job = Box<dyn FnOnce() + Send + 'static>;
-
- impl ThreadPool {
- pub fn new(size: usize) -> ThreadPool {
- assert!(size > 0);
-
- let (sender, receiver) = mpsc::channel();
-
- let receiver = Arc::new(Mutex::new(receiver));
-
- let mut workers = Vec::with_capacity(size);
-
- for id in 0..size {
- workers.push(Worker::new(id, Arc::clone(&receiver)));
- }
-
- ThreadPool {
- workers,
- sender,
- }
-
- }
- pub fn execute<F>(&self, f: F)
- where
- F: FnOnce() + Send + 'static
- {
- let job = Box::new(f);
-
- self.sender.send(Message::NewJob(job)).unwrap();
- }
-
- // pub fn spawn<F, T>(f: F) -> JoinHandle<T>
- // where
- // F: FnOnce() -> T + Send + 'static,
- // T: Send + 'static
- // {
-
- // }
-
- }
-
- impl Drop for ThreadPool {
- fn drop(&mut self) {
- println!("Sending terminate message to all workers.");
- for _ in &mut self.workers {
- self.sender.send(Message::Terminate).unwrap();
- }
- println!("Shutting down all workers.");
-
- for worker in &mut self.workers {
- println!("Shutting down worker {}.", worker.id);
-
- if let Some(thread) = worker.thread.take() {
- thread.join().unwrap();
- }
- }
- }
- }
-
- struct Worker {
- id: usize,
- thread: Option<thread::JoinHandle<()>>,
- }
-
- impl Worker {
- fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) ->
- Worker {
-
- let thread = thread::spawn(move ||{
- loop {
- let message = receiver.lock().unwrap().recv().unwrap();
-
- match message {
- Message::NewJob(job) => {
- println!("Worker {} got a job; executing.", id);
-
- job();
- },
- Message::Terminate => {
- println!("Worker {} was told to terminate.", id);
-
- break;
- },
- }
- }
- });
-
- Worker {
- id,
- thread: Some(thread),
- }
- }
- }
|