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use ::{ NifEnv, NifTerm, NifEncoder };
use ::env::OwnedEnv;
use ::types::atom::NifAtom;
use std::thread;
use std::panic;
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: NifEnv<'a>, thread_fn: F)
where F: for<'b> FnOnce(NifEnv<'b>) -> NifTerm<'b> + Send + panic::UnwindSafe + 'static,
S: JobSpawner,
{
let pid = env.pid();
S::spawn(move || {
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 {
NifAtom::from_bytes(env, b"nif_panic").ok().unwrap().to_term(env)
};
env.error_tuple(reason)
}
}
});
});
}