Instrument for loom
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ce38df5b41
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0795399da5
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@ -16,6 +16,9 @@ edition = "2021"
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metrics = "0.22.0"
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tracing = "0.1.40"
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[dev-dependencies]
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[target.'cfg(loom)'.dependencies]
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loom = { version = "0.7", features = ["futures"] }
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[target.'cfg(not(loom))'.dev-dependencies]
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smol = "2.0.0"
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tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
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@ -1,6 +1,9 @@
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#[cfg(not(loom))]
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use std::time::Duration;
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#[cfg(not(loom))]
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use tracing_subscriber::{fmt, prelude::*, EnvFilter};
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#[cfg(not(loom))]
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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tracing_subscriber::registry()
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.with(fmt::layer())
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@ -52,3 +55,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
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Ok(())
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})
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}
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#[cfg(loom)]
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fn main() {}
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@ -1,4 +1,4 @@
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use std::sync::Arc;
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use crate::sync::Arc;
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use crate::notify::Notify;
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@ -7,6 +7,7 @@ mod notify;
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mod queue;
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mod selector;
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mod spsc;
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mod sync;
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use std::{
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future::Future,
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216
src/notify.rs
216
src/notify.rs
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@ -1,13 +1,11 @@
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use std::{
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collections::VecDeque,
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future::{poll_fn, Future},
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sync::{
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atomic::{AtomicU8, Ordering},
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Arc, Mutex,
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},
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task::{Poll, Waker},
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};
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use crate::sync::{Arc, AtomicU8, Mutex, Ordering};
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const UNNOTIFIED: u8 = 0b0000;
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const NOTIFIED_ONE: u8 = 0b0001;
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const RESOLVED: u8 = 0b0010;
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@ -210,3 +208,213 @@ impl Future for Listener<'_> {
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Poll::Pending
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}
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}
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#[cfg(all(test, loom))]
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mod tests {
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use super::Notify;
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use std::future::Future;
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struct NoopWaker;
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impl std::task::Wake for NoopWaker {
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fn wake(self: std::sync::Arc<Self>) {}
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fn wake_by_ref(self: &std::sync::Arc<Self>) {}
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}
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fn noop_waker() -> std::task::Waker {
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std::sync::Arc::new(NoopWaker).into()
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}
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#[test]
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fn dropped_notified_listener() {
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loom::model(|| {
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loom::future::block_on(async {
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let notify = Notify::new();
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let listener = notify.listen().await;
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notify.notify_one();
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drop(listener);
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assert_eq!(
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notify.state.lock().unwrap().token,
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1,
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"Dropped notify should not have consumed token"
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);
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});
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});
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}
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#[test]
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fn threaded_dropped_notified_listener() {
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loom::model(|| {
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let notify = loom::sync::Arc::new(Notify::new());
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let notify2 = notify.clone();
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let handle = loom::thread::spawn(move || {
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loom::future::block_on(async move {
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drop(notify2.listen().await);
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});
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});
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notify.notify_one();
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handle.join().unwrap();
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assert_eq!(
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notify.state.lock().unwrap().token,
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1,
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"Dropped notify should not have consumed token"
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);
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});
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}
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#[test]
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fn notified_listener() {
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loom::model(|| {
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loom::future::block_on(async {
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let notify = Notify::new();
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let mut listener = notify.listen().await;
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notify.notify_one();
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let waker = noop_waker();
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let mut cx = std::task::Context::from_waker(&waker);
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assert_eq!(
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std::pin::Pin::new(&mut listener).poll(&mut cx),
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std::task::Poll::Ready(()),
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"Polled listen should be notified"
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);
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assert_eq!(
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notify.state.lock().unwrap().token,
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0,
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"Dropped notify should have consumed token"
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);
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})
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});
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}
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#[test]
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fn threaded_notified_listener() {
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loom::model(|| {
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let notify = loom::sync::Arc::new(Notify::new());
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let notify2 = notify.clone();
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let handle = loom::thread::spawn(move || {
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loom::future::block_on(async move {
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notify2.listen().await.await;
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});
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});
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notify.notify_one();
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handle.join().unwrap();
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assert_eq!(
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notify.state.lock().unwrap().token,
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0,
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"Dropped notify should have consumed token"
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);
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});
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}
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#[test]
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fn multiple_listeners() {
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loom::model(|| {
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loom::future::block_on(async {
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let notify = Notify::new();
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let mut listener_1 = notify.listen().await;
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let mut listener_2 = notify.listen().await;
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notify.notify_one();
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let waker = noop_waker();
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let mut cx = std::task::Context::from_waker(&waker);
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assert_eq!(
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std::pin::Pin::new(&mut listener_1).poll(&mut cx),
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std::task::Poll::Ready(()),
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"Polled listen_1 should be notified"
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);
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assert_eq!(
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std::pin::Pin::new(&mut listener_2).poll(&mut cx),
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std::task::Poll::Pending,
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"Polled listen_2 should not be notified"
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);
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});
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});
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}
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#[test]
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fn multiple_notifies() {
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loom::model(|| {
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loom::future::block_on(async {
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let notify = Notify::new();
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let mut listener_1 = notify.listen().await;
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let mut listener_2 = notify.listen().await;
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notify.notify_one();
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notify.notify_one();
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let waker = noop_waker();
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let mut cx = std::task::Context::from_waker(&waker);
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assert_eq!(
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std::pin::Pin::new(&mut listener_1).poll(&mut cx),
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std::task::Poll::Ready(()),
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"Polled listen_1 should be notified"
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);
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assert_eq!(
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std::pin::Pin::new(&mut listener_2).poll(&mut cx),
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std::task::Poll::Ready(()),
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"Polled listen_2 should be notified"
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);
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assert_eq!(
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notify.state.lock().unwrap().token,
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0,
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"notifies should have consumed tokens"
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);
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});
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});
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}
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#[test]
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fn threaded_multiple_notifies() {
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loom::model(|| {
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let notify = loom::sync::Arc::new(Notify::new());
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let notify2 = notify.clone();
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let handle1 = loom::thread::spawn(move || {
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loom::future::block_on(async move {
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notify2.listen().await.await;
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})
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});
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let notify2 = notify.clone();
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let handle2 = loom::thread::spawn(move || {
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loom::future::block_on(async move {
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notify2.listen().await.await;
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})
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});
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notify.notify_one();
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notify.notify_one();
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handle1.join().unwrap();
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handle2.join().unwrap();
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assert_eq!(
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notify.state.lock().unwrap().token,
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0,
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"threaded notifies should have consumed tokens"
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);
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});
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}
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}
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@ -1,9 +1,7 @@
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use std::{
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collections::VecDeque,
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sync::{Arc, Mutex},
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};
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use std::collections::VecDeque;
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use crate::notify::Notify;
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use crate::sync::{Arc, Mutex};
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pub(super) fn bounded<T>(capacity: usize) -> Queue<T> {
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Queue::bounded(capacity)
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@ -1,13 +1,11 @@
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use std::{
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future::Future,
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pin::Pin,
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sync::{
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atomic::{AtomicBool, Ordering},
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Arc,
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},
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task::{Context, Poll, Wake, Waker},
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};
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use crate::sync::{Arc, AtomicBool, Ordering};
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pub(super) enum Either<L, R> {
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Left(L),
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Right(R),
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@ -27,16 +25,16 @@ struct SelectWaker {
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}
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impl Wake for SelectWaker {
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fn wake_by_ref(self: &Arc<Self>) {
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fn wake_by_ref(self: &std::sync::Arc<Self>) {
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self.flag.store(true, Ordering::Release);
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self.inner.wake_by_ref();
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}
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fn wake(self: Arc<Self>) {
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fn wake(self: std::sync::Arc<Self>) {
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self.flag.store(true, Ordering::Release);
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match Arc::try_unwrap(self) {
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match std::sync::Arc::try_unwrap(self) {
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Ok(this) => this.inner.wake(),
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Err(this) => this.inner.wake_by_ref(),
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}
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@ -51,7 +49,7 @@ where
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type Output = Either<F1::Output, F2::Output>;
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fn poll(mut self: std::pin::Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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let left_waker = Arc::new(SelectWaker {
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let left_waker = std::sync::Arc::new(SelectWaker {
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inner: cx.waker().clone(),
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flag: self.left_woken.clone(),
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})
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return Poll::Ready(Either::Left(left_out));
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}
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let right_waker = Arc::new(SelectWaker {
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let right_waker = std::sync::Arc::new(SelectWaker {
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inner: cx.waker().clone(),
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flag: self.right_woken.clone(),
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})
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11
src/sync.rs
Normal file
11
src/sync.rs
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#[cfg(not(loom))]
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pub(crate) use std::sync::{
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atomic::{AtomicBool, AtomicU8, Ordering},
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Arc, Mutex,
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};
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#[cfg(loom)]
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pub(crate) use loom::sync::{
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atomic::{AtomicBool, AtomicU8, Ordering},
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Arc, Mutex,
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};
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