thread_pool.rs
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thread_pool.rs
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	use std::sync::mpsc;
	use std::sync::Arc;
	use std::sync::Mutex;
	use std::thread;

	enum Message {
	NewJob(Job),
	Terminate,
	}

	pub struct ThreadPool {
	jobs: mpsc::Sender<Message>,
	threads: Vec<Worker>,
	}

	trait FnBox {
	fn call_box(self: Box<Self>);
	}

	impl<F: FnOnce()> FnBox for F {
	fn call_box(self: Box<F>) {
	(*self)()
	}
	}

	type Job = Box<dyn FnBox + Send + 'static>;

	impl ThreadPool {
	pub fn new(thread_count: usize) -> Self {
	let (jobs, receiver) = mpsc::channel();
	let receiver = Arc::new(Mutex::new(receiver));

	let mut threads: Vec<Worker> = Vec::new();
	for id in 1..thread_count {
	threads.push(Worker::new(id, Arc::clone(&receiver)));
	}

	ThreadPool { jobs, threads }
	}

	pub fn execute<F>(&self, f: F)
	where
	F: FnOnce() + Send + 'static,
	{
	let job = Box::new(f);
	self.jobs.send(Message::NewJob(job)).unwrap();
	}
	}

	impl Drop for ThreadPool {
	fn drop(&mut self) {
	for _ in &mut self.threads {
	self.jobs.send(Message::Terminate).unwrap();
	}

	for worker in &mut self.threads {
	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) => job.call_box(),
	Message::Terminate => {
	break;
	}
	}
	});

	Worker {
	_id: id,
	thread: Some(thread),
	}
	}
	}