Done code review

Author: Kelwan

reference/async_reference/async_reference.cc

@@ -170,8 +170,10 @@ void async_reference::execute_systems() {
 
 			entity_manager.process_entities(async_callbacks, *registry_id);
 
+			auto exec_lk = exec_callbacks.lock();
 			auto systems_error =
 				ecsact_execute_systems(*registry_id, 1, options.get(), collector);
+			exec_lk.unlock();
 
 			auto end = clock::now();
 			execution_duration = duration_cast<nanoseconds>(end - start);

reference/async_reference/callbacks/execution_callbacks.hh

@@ -17,6 +17,10 @@ public:
 
 	ecsact_execution_events_collector* get_collector();
 
+	inline auto lock() -> std::unique_lock<std::mutex> {
+		return std::unique_lock(execution_m);
+	}
+
 private:
 	ecsact_execution_events_collector collector;
 	std::mutex                        execution_m;