AsyncでExclusiveEntityTransactionを作る

Loader2.cs

using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Unity.Entities;
using Unity.Jobs;
using UnityEngine;
using UnityEngine.Profiling;

public class Loader2 : MonoBehaviour {

    World myWorld;
    EntityManager myEntityManager;

    private void Awake()
    {
        myWorld = new World("my world");
        myEntityManager = myWorld.GetOrCreateManager<EntityManager>();
        World.Active.GetExistingManager<EntityManager>().MoveEntitiesFrom(myEntityManager);
    }

    private void OnDestroy()
    {
        if( myWorld.IsCreated)
            myWorld.Dispose();
    }

    async void Start()
    {
        var samplerThread = CustomSampler.Create("thread");

        var entity = myEntityManager.CreateEntity(typeof(Sample));
        var commands = myEntityManager.BeginExclusiveEntityTransaction();

        await Task.Run(() =>
        {
            Profiler.BeginThreadProfiling("creater", "spawnInstance");
            samplerThread.Begin();
            for (int i = 0; i < 10000; i++)
            {
                var e = commands.Instantiate(entity);
                var c = new Sample() { value = i };
                commands.SetComponentData(e, c);
            }
            samplerThread.End();
            Profiler.EndThreadProfiling();
        });

        myEntityManager.EndExclusiveEntityTransaction();
        World.Active.GetExistingManager<EntityManager>().MoveEntitiesFrom(myEntityManager);
    }

    struct Sample : IComponentData
    {
        public int value;
    }
}