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use core::mem;
use sync::spsc::oneshot::{channel, Receiver, RecvError};
use thread::prelude::*;
#[must_use]
pub struct RoutineFuture<R, E> {
rx: Receiver<R, E>,
}
impl<R, E> RoutineFuture<R, E> {
pub(crate) fn new<T, G>(thread: &T, mut generator: G) -> Self
where
T: Thread,
G: Generator<Yield = (), Return = Result<R, E>>,
G: Send + 'static,
R: Send + 'static,
E: Send + 'static,
{
let (tx, rx) = channel();
thread.routines().push(move || loop {
if tx.is_canceled() {
break;
}
match generator.resume() {
Yielded(()) => {}
Complete(complete) => {
tx.send(complete).ok();
break;
}
}
yield;
});
Self { rx }
}
#[inline(always)]
pub fn close(&mut self) {
self.rx.close()
}
}
impl<R, E> Future for RoutineFuture<R, E> {
type Item = R;
type Error = E;
#[inline(always)]
fn poll(&mut self) -> Poll<R, E> {
self.rx.poll().map_err(|err| match err {
RecvError::Complete(err) => err,
RecvError::Canceled => unsafe { mem::unreachable() },
})
}
}