Resolved Why I need to call jobhandle.complete,and use the job1.jobhandle as the job2's dependency not work

Here is the error:
InvalidOperationException: The previously scheduled job CalculateCostJob writes to the BufferTypeHandle<CellBuffer> CalculateCostJob.cells. You must call JobHandle.Complete() on the job CalculateCostJob, before you can read from the BufferTypeHandle<CellBuffer> safely.
Unity.Entities.WorldUnmanagedImpl+UnmanagedUpdate_000014A0$BurstDirectCall.Invoke (System.Void* pSystemState) (at <4a8bc4d753ec4ca78e91db456a7e73fb>:0)

And Here is the update code

Code (CSharp):

1.  
2. [BurstCompile]
3.     public void OnUpdate(ref SystemState state)
4.     {
5.         var flowFieldSetting = SystemAPI.GetSingleton<FlowFieldSettingData>();
6.         var cellBuffer = SystemAPI.GetSingletonBuffer<CellBuffer>().Reinterpret<CellData>();
7.  
8.         state.EntityManager.CompleteDependencyBeforeRO<PhysicsWorldSingleton>();
9.         state.EntityManager.CompleteDependencyBeforeRO<LocalTransform>();
10.  
11.         localTransformList.Update(ref state);
12.         physicsMassList.Update(ref state);
13.  
14.         var settingData = SystemAPI.GetSingleton<FlowFieldSettingData>();
15.  
16.         var costJob = new CalculateCostJob()
17.         {
18.             cells = cellBuffer.AsNativeArray(),
19.             physicsWorld = SystemAPI.GetSingleton<PhysicsWorldSingleton>().PhysicsWorld,
20.             pgaInms2 = SystemAPI.GetSingleton<TimerData>().curPGA * Constants.gravity,
21.             cellRadius = settingData.cellRadius,
22.             localTransformList = localTransformList,
23.             physicsMassList = physicsMassList
24.         }.Schedule(cellBuffer.Length, 64, state.Dependency);
25.  
26.         // costJob.Complete();
27.  
28.         var integrationJob = new CalCulateIntegration_FastMarchingMethodJob()
29.         {
30.             cells = cellBuffer.AsNativeArray(),
31.             settingData = settingData
32.         }.Schedule(costJob);
33.  
34.  
35.         state.Dependency = integrationJob;
36.     }
37.  

is the way i use the dependency is wrong?

 

This is the issue. You already assigned and

Scheduled

CalculateCostJob

and it can run at any time, which means on next row - 30 you can't call

.AsNativeArray()

as it's not safe (previous job already can write to that memory).


To solve this just write this on row 15 and use that in both jobs.

Code (CSharp):

1. var cells = cellBuffer.AsNativeArray();

 

Thanks a lot, it FIXED