System sets and parallel executor v2

crates/bevy_app/src/app.rs

@@ -1,5 +1,5 @@
 use crate::app_builder::AppBuilder;
-use bevy_ecs::{Resources, Schedule, World};
+use bevy_ecs::{Resources, Schedule, Stage, World};
 #[cfg(feature = "trace")]
 use bevy_utils::tracing::info_span;
 
@@ -53,8 +53,7 @@ impl App {
     }
 
     pub fn update(&mut self) {
-        self.schedule
-            .initialize_and_run(&mut self.world, &mut self.resources);
+        self.schedule.run(&mut self.world, &mut self.resources);
     }
 
     pub fn run(mut self) {

crates/bevy_app/src/app_builder.rs

@@ -5,8 +5,8 @@ use crate::{
     stage, startup_stage, PluginGroup, PluginGroupBuilder,
 };
 use bevy_ecs::{
-    clear_trackers_system, FromResources, IntoSystem, Resource, Resources, RunOnce, Schedule,
-    Stage, StateStage, System, SystemStage, World,
+    clear_trackers_system, FromResources, IntoExclusiveSystem, IntoSystem, Resource, Resources,
+    RunOnce, Schedule, Stage, StateStage, SystemDescriptor, SystemStage, World,
 };
 use bevy_utils::tracing::debug;
 
@@ -24,7 +24,7 @@ impl Default for AppBuilder {
         app_builder
             .add_default_stages()
             .add_event::<AppExit>()
-            .add_system_to_stage(stage::LAST, clear_trackers_system.system());
+            .add_system_to_stage(stage::LAST, clear_trackers_system.exclusive_system());
         app_builder
     }
 }
@@ -125,60 +125,69 @@ impl AppBuilder {
         self
     }
 
-    pub fn add_system<S: System<In = (), Out = ()>>(&mut self, system: S) -> &mut Self {
+    pub fn add_system(&mut self, system: impl Into<SystemDescriptor>) -> &mut Self {
         self.add_system_to_stage(stage::UPDATE, system)
     }
 
-    pub fn on_state_enter<T: Clone + Resource, S: System<In = (), Out = ()>>(
+    pub fn add_system_to_stage(
+        &mut self,
+        stage_name: &'static str,
+        system: impl Into<SystemDescriptor>,
+    ) -> &mut Self {
+        self.app.schedule.add_system_to_stage(stage_name, system);
+        self
+    }
+
+    pub fn add_startup_system(&mut self, system: impl Into<SystemDescriptor>) -> &mut Self {
+        self.add_startup_system_to_stage(startup_stage::STARTUP, system)
+    }
+
+    pub fn add_startup_system_to_stage(
+        &mut self,
+        stage_name: &'static str,
+        system: impl Into<SystemDescriptor>,
+    ) -> &mut Self {
+        self.app
+            .schedule
+            .stage(stage::STARTUP, |schedule: &mut Schedule| {
+                schedule.add_system_to_stage(stage_name, system)
+            });
+        self
+    }
+
+    pub fn on_state_enter<T: Clone + Resource>(
         &mut self,
         stage: &str,
         state: T,
-        system: S,
+        system: impl Into<SystemDescriptor>,
     ) -> &mut Self {
         self.stage(stage, |stage: &mut StateStage<T>| {
             stage.on_state_enter(state, system)
         })
     }
 
-    pub fn on_state_update<T: Clone + Resource, S: System<In = (), Out = ()>>(
+    pub fn on_state_update<T: Clone + Resource>(
         &mut self,
         stage: &str,
         state: T,
-        system: S,
+        system: impl Into<SystemDescriptor>,
     ) -> &mut Self {
         self.stage(stage, |stage: &mut StateStage<T>| {
             stage.on_state_update(state, system)
         })
     }
 
-    pub fn on_state_exit<T: Clone + Resource, S: System<In = (), Out = ()>>(
+    pub fn on_state_exit<T: Clone + Resource>(
         &mut self,
         stage: &str,
         state: T,
-        system: S,
+        system: impl Into<SystemDescriptor>,
     ) -> &mut Self {
         self.stage(stage, |stage: &mut StateStage<T>| {
             stage.on_state_exit(state, system)
         })
     }
 
-    pub fn add_startup_system_to_stage<S: System<In = (), Out = ()>>(
-        &mut self,
-        stage_name: &'static str,
-        system: S,
-    ) -> &mut Self {
-        self.app
-            .schedule
-            .stage(stage::STARTUP, |schedule: &mut Schedule| {
-                schedule.add_system_to_stage(stage_name, system)
-            });
-        self
-    }
-
-    pub fn add_startup_system<S: System<In = (), Out = ()>>(&mut self, system: S) -> &mut Self {
-        self.add_startup_system_to_stage(startup_stage::STARTUP, system)
-    }
-
     pub fn add_default_stages(&mut self) -> &mut Self {
         self.add_stage(
             stage::STARTUP,
@@ -197,15 +206,6 @@ impl AppBuilder {
         .add_stage(stage::LAST, SystemStage::parallel())
     }
 
-    pub fn add_system_to_stage<S: System<In = (), Out = ()>>(
-        &mut self,
-        stage_name: &'static str,
-        system: S,
-    ) -> &mut Self {
-        self.app.schedule.add_system_to_stage(stage_name, system);
-        self
-    }
-
     pub fn add_event<T>(&mut self) -> &mut Self
     where
         T: Send + Sync + 'static,
@@ -223,11 +223,11 @@ impl AppBuilder {
         self
     }
 
-    pub fn insert_thread_local_resource<T>(&mut self, resource: T) -> &mut Self
+    pub fn insert_non_send_resource<T>(&mut self, resource: T) -> &mut Self
     where
         T: 'static,
     {
-        self.app.resources.insert_thread_local(resource);
+        self.app.resources.insert_non_send(resource);
         self
     }
 
@@ -242,20 +242,18 @@ impl AppBuilder {
             let resource = R::from_resources(&self.resources());
             self.insert_resource(resource);
         }
-
         self
     }
 
-    pub fn init_thread_local_resource<R>(&mut self) -> &mut Self
+    pub fn init_non_send_resource<R>(&mut self) -> &mut Self
     where
         R: FromResources + 'static,
     {
         // See perf comment in init_resource
-        if self.app.resources.get_thread_local::<R>().is_none() {
+        if self.app.resources.get_non_send::<R>().is_none() {
             let resource = R::from_resources(&self.app.resources);
-            self.app.resources.insert_thread_local(resource);
+            self.app.resources.insert_non_send(resource);
         }
-
         self
     }
 

crates/bevy_audio/src/audio_output.rs

@@ -65,7 +65,7 @@ where
     <P as Decodable>::Decoder: rodio::Source + Send + Sync,
     <<P as Decodable>::Decoder as Iterator>::Item: rodio::Sample + Send + Sync,
 {
-    let audio_output = resources.get_thread_local::<AudioOutput<P>>().unwrap();
+    let audio_output = resources.get_non_send::<AudioOutput<P>>().unwrap();
     let mut audio = resources.get_mut::<Audio<P>>().unwrap();
 
     if let Some(audio_sources) = resources.get::<Assets<P>>() {

crates/bevy_audio/src/lib.rs

@@ -12,21 +12,21 @@ pub mod prelude {
 
 use bevy_app::prelude::*;
 use bevy_asset::AddAsset;
-use bevy_ecs::IntoSystem;
+use bevy_ecs::IntoExclusiveSystem;
 
 /// Adds support for audio playback to an App
 #[derive(Default)]
 pub struct AudioPlugin;
 
 impl Plugin for AudioPlugin {
     fn build(&self, app: &mut AppBuilder) {
-        app.init_thread_local_resource::<AudioOutput<AudioSource>>()
+        app.init_non_send_resource::<AudioOutput<AudioSource>>()
             .add_asset::<AudioSource>()
             .init_asset_loader::<Mp3Loader>()
             .init_resource::<Audio<AudioSource>>()
             .add_system_to_stage(
                 stage::POST_UPDATE,
-                play_queued_audio_system::<AudioSource>.system(),
+                play_queued_audio_system::<AudioSource>.exclusive_system(),
             );
     }
 }

crates/bevy_core/src/label.rs

@@ -115,13 +115,14 @@ pub(crate) fn entity_labels_system(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use bevy_ecs::Stage;
 
     fn setup() -> (World, Resources, bevy_ecs::Schedule) {
         let world = World::new();
         let mut resources = Resources::default();
         resources.insert(EntityLabels::default());
         let mut schedule = bevy_ecs::Schedule::default();
-        schedule.add_stage("test", SystemStage::serial());
+        schedule.add_stage("test", SystemStage::single_threaded());
         schedule.add_system_to_stage("test", entity_labels_system.system());
         (world, resources, schedule)
     }
@@ -139,7 +140,7 @@ mod tests {
         let (mut world, mut resources, mut schedule) = setup();
 
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[e1], "holy");
@@ -151,10 +152,10 @@ mod tests {
     fn add_labels() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         world.get_mut::<Labels>(e1).unwrap().insert("shalau");
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[e1], "holy");
@@ -166,10 +167,10 @@ mod tests {
     fn remove_labels() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         world.get_mut::<Labels>(e1).unwrap().remove("holy");
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[], "holy");
@@ -181,10 +182,10 @@ mod tests {
     fn removes_despawned_entity() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         world.despawn(e1).unwrap();
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[], "holy");
@@ -196,10 +197,10 @@ mod tests {
     fn removes_labels_when_component_removed() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         world.remove_one::<Labels>(e1).unwrap();
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[], "holy");
@@ -211,10 +212,10 @@ mod tests {
     fn adds_another_spawned_entity() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let e2 = world.spawn((holy_shamoni(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[e1, e2], "holy");
@@ -227,13 +228,13 @@ mod tests {
     fn removes_despawned_entity_but_leaves_other() {
         let (mut world, mut resources, mut schedule) = setup();
         let e1 = world.spawn((holy_cow(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let e2 = world.spawn((holy_shamoni(),));
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         world.despawn(e1).unwrap();
-        schedule.initialize_and_run(&mut world, &mut resources);
+        schedule.run(&mut world, &mut resources);
 
         let entity_labels = resources.get::<EntityLabels>().unwrap();
         assert_eq!(entity_labels.get("holy"), &[e2], "holy");

crates/bevy_core/src/time/fixed_timestep.rs

@@ -1,5 +1,5 @@
 use crate::Time;
-use bevy_ecs::{ArchetypeComponent, ShouldRun, System, SystemId, ThreadLocalExecution, TypeAccess};
+use bevy_ecs::{ArchetypeComponent, ShouldRun, System, SystemId, TypeAccess};
 use bevy_utils::HashMap;
 use std::{any::TypeId, borrow::Cow};
 
@@ -47,8 +47,9 @@ pub struct FixedTimestep {
     looping: bool,
     system_id: SystemId,
     label: Option<String>, // TODO: consider making this a TypedLabel
-    resource_access: TypeAccess<TypeId>,
     archetype_access: TypeAccess<ArchetypeComponent>,
+    component_access: TypeAccess<TypeId>,
+    resource_access: TypeAccess<TypeId>,
 }
 
 impl Default for FixedTimestep {
@@ -59,8 +60,9 @@ impl Default for FixedTimestep {
             accumulator: 0.0,
             looping: false,
             label: None,
-            resource_access: Default::default(),
+            component_access: Default::default(),
             archetype_access: Default::default(),
+            resource_access: Default::default(),
         }
     }
 }
@@ -93,7 +95,7 @@ impl FixedTimestep {
         if self.accumulator >= self.step {
             self.accumulator -= self.step;
             self.looping = true;
-            ShouldRun::YesAndLoop
+            ShouldRun::YesAndCheckAgain
         } else {
             self.looping = false;
             ShouldRun::No
@@ -113,18 +115,22 @@ impl System for FixedTimestep {
         self.system_id
     }
 
-    fn update(&mut self, _world: &bevy_ecs::World) {}
+    fn update_access(&mut self, _world: &bevy_ecs::World) {}
 
     fn archetype_component_access(&self) -> &TypeAccess<ArchetypeComponent> {
         &self.archetype_access
     }
 
+    fn component_access(&self) -> &TypeAccess<TypeId> {
+        &self.component_access
+    }
+
     fn resource_access(&self) -> &TypeAccess<TypeId> {
         &self.resource_access
     }
 
-    fn thread_local_execution(&self) -> ThreadLocalExecution {
-        ThreadLocalExecution::Immediate
+    fn is_non_send(&self) -> bool {
+        false
     }
 
     unsafe fn run_unsafe(
@@ -145,7 +151,7 @@ impl System for FixedTimestep {
         Some(result)
     }
 
-    fn run_thread_local(
+    fn apply_buffers(
         &mut self,
         _world: &mut bevy_ecs::World,
         _resources: &mut bevy_ecs::Resources,