/
notify.rs
75 lines (64 loc) · 2.03 KB
/
notify.rs
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use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering};
use crate::{MIOCO, LoopMsg, FiberId, co_switch_out, TL_LOOP_ID, TL_FIBER_ID};
use std;
struct Shared {
loop_id: AtomicUsize,
fiber_id: AtomicUsize,
is_set: AtomicBool,
}
#[derive(Clone)]
pub struct Sender {
shared: Arc<Shared>,
}
impl Sender {
// Notify the `Receiver`
//
// This does not block
pub fn notify(&self) {
// TODO: Optimize/fix ordering?
if !self.shared.is_set.swap(true, Ordering::SeqCst) {
let fiber_id = self.shared.fiber_id.load(Ordering::Relaxed);
let loop_id = self.shared.loop_id.load(Ordering::Relaxed);
if loop_id != std::usize::MAX {
MIOCO.loop_tx[loop_id].send(LoopMsg::Wake(FiberId(fiber_id)));
}
}
}
}
pub struct Receiver {
shared: Arc<Shared>,
}
impl Receiver {
pub fn reset(&self) {
self.shared.is_set.store(false, Ordering::SeqCst)
}
pub fn wait(&self) {
loop {
let cur_fiber = TL_FIBER_ID.with(|id| id.get());
let cur_loop = TL_LOOP_ID.with(|id| id.get());
self.shared.fiber_id.store(cur_fiber.0, Ordering::Relaxed);
self.shared.loop_id.store(cur_loop.0, Ordering::Relaxed);
// TODO: Optimize/fix ordering?
if self.shared.is_set.load(Ordering::SeqCst) {
return;
}
co_switch_out();
}
}
/// Try waiting
///
/// returns `true` if was notified
pub fn try_wait(&self) -> bool {
// TODO: Optimize/fix ordering?
self.shared.is_set.swap(false, Ordering::SeqCst)
}
}
pub fn channel() -> (Sender, Receiver) {
let shared = Arc::new(Shared {
fiber_id: AtomicUsize::new(std::usize::MAX),
loop_id: AtomicUsize::new(std::usize::MAX),
is_set: AtomicBool::new(false),
});
(Sender { shared: shared.clone() }, Receiver { shared: shared })
}