add system to tick local executors on main thread

Author: hymm

crates/bevy_core/src/lib.rs

@@ -4,7 +4,9 @@
 mod name;
 mod task_pool_options;
 
+use bevy_ecs::schedule::IntoSystemDescriptor;
 use bevy_ecs::system::Resource;
+use bevy_ecs::world::World;
 pub use bytemuck::{bytes_of, cast_slice, Pod, Zeroable};
 pub use name::*;
 pub use task_pool_options::*;
@@ -17,6 +19,7 @@ pub mod prelude {
 
 use bevy_app::prelude::*;
 use bevy_ecs::entity::Entity;
+use bevy_tasks::prelude::tick_global_task_pools_on_main_thread;
 use bevy_utils::{Duration, HashSet, Instant};
 use std::borrow::Cow;
 use std::ops::Range;
@@ -34,6 +37,13 @@ impl Plugin for CorePlugin {
             .unwrap_or_default()
             .create_default_pools();
 
+        // run function in an exclusive system to make sure it runs on main thread
+        fn tick_local_executors(_world: &mut World) {
+            tick_global_task_pools_on_main_thread();
+        }
+
+        app.add_system_to_stage(bevy_app::CoreStage::Last, tick.at_end());
+
         app.register_type::<Entity>().register_type::<Name>();
 
         register_rust_types(app);

crates/bevy_tasks/src/lib.rs

@@ -29,7 +29,10 @@ pub mod prelude {
     pub use crate::{
         iter::ParallelIterator,
         slice::{ParallelSlice, ParallelSliceMut},
-        usages::{AsyncComputeTaskPool, ComputeTaskPool, IoTaskPool},
+        usages::{
+            tick_global_task_pools_on_main_thread, AsyncComputeTaskPool, ComputeTaskPool,
+            IoTaskPool,
+        },
     };
 }