use crate::env::OwnedEnv;
use crate::{Atom, Encoder, Env, Term};
use std::panic;
use std::thread;
pub trait JobSpawner {
fn spawn<F: FnOnce() + Send + panic::UnwindSafe + 'static>(job: F);
}
pub struct ThreadSpawner;
impl JobSpawner for ThreadSpawner {
fn spawn<F: FnOnce() + Send + panic::UnwindSafe + 'static>(job: F) {
thread::spawn(job);
}
}
pub fn spawn<'a, S, F>(env: Env<'a>, thread_fn: F)
where
F: for<'b> FnOnce(Env<'b>) -> Term<'b> + Send + panic::UnwindSafe + 'static,
S: JobSpawner,
{
let pid = env.pid();
S::spawn(move || {
let _ = OwnedEnv::new().send_and_clear(&pid, |env| {
match panic::catch_unwind(|| thread_fn(env)) {
Ok(term) => term,
Err(err) => {
let reason = if let Some(string) = err.downcast_ref::<String>() {
string.encode(env)
} else if let Some(&s) = err.downcast_ref::<&'static str>() {
s.encode(env)
} else {
Atom::from_bytes(env, b"nif_panic")
.ok()
.unwrap()
.to_term(env)
};
env.error_tuple(reason)
}
}
});
});
}