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Mark events as read during EventReader::par_read
(#13836)
# Objective - Fix issue #13821 ## Solution - Rewrote the test to ensure that it actually tests the functionality correctly. Then made the par_read function correctly change the values of self.reader.last_event_count. ## Testing - Rewrote the test for par_read to run the system schedule twice, checking the output each time --------- Co-authored-by: Martín Maita <47983254+mnmaita@users.noreply.github.com>
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3 changed files with 44 additions and 27 deletions
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@ -1,8 +1,7 @@
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use crate as bevy_ecs;
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use bevy_ecs::{
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batching::BatchingStrategy,
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event::{Event, EventId, EventInstance, Events, ManualEventReader},
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};
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#[cfg(feature = "multi_threaded")]
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use bevy_ecs::batching::BatchingStrategy;
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use bevy_ecs::event::{Event, EventId, EventInstance, Events, ManualEventReader};
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use bevy_utils::detailed_trace;
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use std::{iter::Chain, slice::Iter};
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@ -141,12 +140,15 @@ impl<'a, E: Event> ExactSizeIterator for EventIteratorWithId<'a, E> {
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/// A parallel iterator over `Event`s.
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#[derive(Debug)]
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#[cfg(feature = "multi_threaded")]
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pub struct EventParIter<'a, E: Event> {
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reader: &'a mut ManualEventReader<E>,
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slices: [&'a [EventInstance<E>]; 2],
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batching_strategy: BatchingStrategy,
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unread: usize,
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}
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#[cfg(feature = "multi_threaded")]
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impl<'a, E: Event> EventParIter<'a, E> {
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/// Creates a new parallel iterator over `events` that have not yet been seen by `reader`.
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pub fn new(reader: &'a mut ManualEventReader<E>, events: &'a Events<E>) -> Self {
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@ -168,6 +170,7 @@ impl<'a, E: Event> EventParIter<'a, E> {
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reader,
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slices: [a, b],
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batching_strategy: BatchingStrategy::default(),
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unread: unread_count,
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}
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}
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@ -203,13 +206,13 @@ impl<'a, E: Event> EventParIter<'a, E> {
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/// initialized and run from the ECS scheduler, this should never panic.
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///
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/// [`ComputeTaskPool`]: bevy_tasks::ComputeTaskPool
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pub fn for_each_with_id<FN: Fn(&'a E, EventId<E>) + Send + Sync + Clone>(self, func: FN) {
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#[cfg(any(target_arch = "wasm32", not(feature = "multi_threaded")))]
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pub fn for_each_with_id<FN: Fn(&'a E, EventId<E>) + Send + Sync + Clone>(mut self, func: FN) {
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#[cfg(target_arch = "wasm32")]
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{
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self.into_iter().for_each(|(e, i)| func(e, i));
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}
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#[cfg(all(not(target_arch = "wasm32"), feature = "multi_threaded"))]
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#[cfg(not(target_arch = "wasm32"))]
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{
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let pool = bevy_tasks::ComputeTaskPool::get();
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let thread_count = pool.thread_num();
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@ -233,6 +236,10 @@ impl<'a, E: Event> EventParIter<'a, E> {
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});
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}
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});
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// Events are guaranteed to be read at this point.
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self.reader.last_event_count += self.unread;
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self.unread = 0;
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}
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}
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@ -247,6 +254,7 @@ impl<'a, E: Event> EventParIter<'a, E> {
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}
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}
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#[cfg(feature = "multi_threaded")]
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impl<'a, E: Event> IntoIterator for EventParIter<'a, E> {
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type IntoIter = EventIteratorWithId<'a, E>;
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type Item = <Self::IntoIter as Iterator>::Item;
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@ -11,7 +11,9 @@ pub(crate) use base::EventInstance;
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pub use base::{Event, EventId};
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pub use bevy_ecs_macros::Event;
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pub use collections::{Events, SendBatchIds};
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pub use iterators::{EventIterator, EventIteratorWithId, EventParIter};
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#[cfg(feature = "multi_threaded")]
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pub use iterators::EventParIter;
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pub use iterators::{EventIterator, EventIteratorWithId};
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pub use reader::{EventReader, ManualEventReader};
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pub use registry::{EventRegistry, ShouldUpdateEvents};
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pub use update::{
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@ -421,30 +423,33 @@ mod tests {
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#[cfg(feature = "multi_threaded")]
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#[test]
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fn test_events_par_iter() {
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use std::{collections::HashSet, sync::mpsc};
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use crate::prelude::*;
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use std::sync::atomic::{AtomicUsize, Ordering};
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#[derive(Resource)]
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struct Counter(AtomicUsize);
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let mut world = World::new();
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world.init_resource::<Events<TestEvent>>();
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for i in 0..100 {
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world.send_event(TestEvent { i });
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for _ in 0..100 {
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world.send_event(TestEvent { i: 1 });
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}
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let mut schedule = Schedule::default();
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schedule.add_systems(|mut events: EventReader<TestEvent>| {
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let (tx, rx) = mpsc::channel();
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events.par_read().for_each(|event| {
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tx.send(event.i).unwrap();
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});
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drop(tx);
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let observed: HashSet<_> = rx.into_iter().collect();
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assert_eq!(observed, HashSet::from_iter(0..100));
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});
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schedule.add_systems(
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|mut events: EventReader<TestEvent>, counter: ResMut<Counter>| {
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events.par_read().for_each(|event| {
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counter.0.fetch_add(event.i, Ordering::Relaxed);
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});
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},
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);
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world.insert_resource(Counter(AtomicUsize::new(0)));
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schedule.run(&mut world);
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}
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let counter = world.remove_resource::<Counter>().unwrap();
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assert_eq!(counter.0.into_inner(), 100);
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// Peak tests
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world.insert_resource(Counter(AtomicUsize::new(0)));
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schedule.run(&mut world);
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let counter = world.remove_resource::<Counter>().unwrap();
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assert_eq!(counter.0.into_inner(), 0);
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}
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}
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@ -1,6 +1,8 @@
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use crate as bevy_ecs;
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#[cfg(feature = "multi_threaded")]
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use bevy_ecs::event::EventParIter;
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use bevy_ecs::{
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event::{Event, EventIterator, EventIteratorWithId, EventParIter, Events},
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event::{Event, EventIterator, EventIteratorWithId, Events},
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system::{Local, Res, SystemParam},
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};
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use std::marker::PhantomData;
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@ -66,6 +68,7 @@ impl<'w, 's, E: Event> EventReader<'w, 's, E> {
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/// assert_eq!(counter.into_inner(), 4950);
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/// ```
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///
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#[cfg(feature = "multi_threaded")]
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pub fn par_read(&mut self) -> EventParIter<'_, E> {
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self.reader.par_read(&self.events)
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}
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@ -189,6 +192,7 @@ impl<E: Event> ManualEventReader<E> {
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}
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/// See [`EventReader::par_read`]
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#[cfg(feature = "multi_threaded")]
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pub fn par_read<'a>(&'a mut self, events: &'a Events<E>) -> EventParIter<'a, E> {
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EventParIter::new(self, events)
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}
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