diff --git a/crates/bevy_ecs/src/system/function_system.rs b/crates/bevy_ecs/src/system/function_system.rs index 43f6a3350251b..a3feca724b5ef 100644 --- a/crates/bevy_ecs/src/system/function_system.rs +++ b/crates/bevy_ecs/src/system/function_system.rs @@ -136,6 +136,47 @@ impl SystemMeta { { self.param_warn_policy.try_warn::<P>(&self.name); } + + /// Archetype component access that is used to determine which systems can run in parallel with each other + /// in the multithreaded executor. + /// + /// We use an [`ArchetypeComponentId`] as it is more precise than just checking [`ComponentId`]: + /// for example if you have one system with `Query<&mut A, With<B>`, and one system with `Query<&mut A, Without<B>`, + /// they conflict if you just look at the [`ComponentId`]; + /// but no archetype that matches the first query will match the second and vice versa, + /// which means there's no risk of conflict. + #[inline] + pub fn archetype_component_access(&self) -> &Access<ArchetypeComponentId> { + &self.archetype_component_access + } + + /// Returns a mutable reference to the [`Access`] for [`ArchetypeComponentId`]. + /// This is used to determine which systems can run in parallel with each other + /// in the multithreaded executor. + /// + /// We use an [`ArchetypeComponentId`] as it is more precise than just checking [`ComponentId`]: + /// for example if you have one system with `Query<&mut A, With<B>`, and one system with `Query<&mut A, Without<B>`, + /// they conflict if you just look at the [`ComponentId`]; + /// but no archetype that matches the first query will match the second and vice versa, + /// which means there's no risk of conflict. + #[inline] + pub fn archetype_component_access_mut(&mut self) -> &mut Access<ArchetypeComponentId> { + &mut self.archetype_component_access + } + + /// Returns a reference to the [`FilteredAccessSet`] for [`ComponentId`]. + /// Used to check if systems and/or system params have conflicting access. + #[inline] + pub fn component_access_set(&self) -> &FilteredAccessSet<ComponentId> { + &self.component_access_set + } + + /// Returns a mutable reference to the [`FilteredAccessSet`] for [`ComponentId`]. + /// Used internally to statically check if systems have conflicting access. + #[inline] + pub fn component_access_set_mut(&mut self) -> &mut FilteredAccessSet<ComponentId> { + &mut self.component_access + } } /// State machine for emitting warnings when [system params are invalid](System::validate_param).