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use std::sync::Arc;
use std::sync::Mutex;
use std::sync::mpsc;
use std::thread;
trait FnBox {
fn call_box(self: Box<Self>);
}
impl <F: FnOnce()> FnBox for F {
fn call_box(self: Box<F>) {
(*self)()
}
}
type Job = Box<FnBox + Send + 'static>;
pub struct ThreadPool {
workers: Vec<Worker>,
sender: mpsc::Sender<Job>,
}
impl ThreadPool {
pub fn new(size: usize) -> Result<ThreadPool, &'static str> {
if size <= 0 {
return Err("failed to create pool");
}
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))?);
}
Ok(ThreadPool {
workers,
sender,
})
}
pub fn spawn<F, T>(f: F) -> thread::JoinHandle<T>
where
F: FnOnce() -> T + Send + 'static,
T: Send + 'static
{
thread::spawn(f)
}
pub fn execute<F>(&self, f: F)
where
F: FnOnce() + Send + 'static
{
let job = Box::new(f);
self.sender.send(job).unwrap();
}
}
struct Worker {
id: usize,
thread: thread::JoinHandle<()>,
}
impl Worker {
pub fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>)
-> Result<Worker, &'static str>
{
let thread = thread::spawn(move || {
loop {
let job = receiver
.lock().expect("lock poisoned!")
.recv().unwrap();
println!("worker {} got job; executing...", id);
job.call_box();
}
});
Ok(Worker {
id,
thread,
})
}
}
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