How to write then read a NativeList without calling Complete()

Using two IJobParallelFor jobs, how can I accomplish this:

Code (CSharp):

1. var list = new NativeList();
2. var data = new NativeArray();
3.  
4. var populateList = new PopulateListJob
5. {
6.     data = data ,
7.     list = list
8. }.Schedule( data.Length , 64 , Dependency );
9.  
10. var readFromList = new ReadFromListJob
11. {
12.     list = list.ASArray()
13. }.Schedule( list.Length , 64 , populateList );

Without having to call complete on the first job. If there is a specific job type or data structure for this, can you show simple usage please? I have seen NativeStream and looked at examples in Unity.Tests folder but I don't understand the syntax used. Thank you.

 

Use the first job handle as the dependency for the second job.
Also reassign Dependency at the end.

Code (CSharp):

1. var list = new NativeList();
2. var data = new NativeArray();
3.  
4. var populateList = new PopulateListJob
5. {
6.     data = data ,
7.     list = list
8. }.Schedule( data.Length , 64 , Dependency );
9.  
10. var Dependency = new ReadFromListJob
11. {
12.     list = list.ASArray()
13. }.Schedule( list.Length , 64 , populateList );

 

No I am getting dependency error still it doesn't work.

 

list = list.ASArray()
is not valid because you don't know how long the list is until the PopulateListJob has finished

Use the NativeList in ReadFromListJob instead of a NativeArray

 

The problem is the number of items added to the list can vary greatly so when I read it in parallel I could spend most of the job reading an empty list. So I am wondering if there is a way around this.

Right now, I am writing collision pairs to a NativeQueue. Then I call complete. Then I convert the queue to an array, then resolve collisions over the array of colliding pairs. I thought maybe using list could avoid calling complete.

 

Because you calling AsArray, but first job already scheduled on this list, this is why you getting error from safety. You should use AsDeferredJobArray with IJobParallelForDeffer in this case for second job.

 

Thank you, problem solved! It seems that using the queue with Complete() is faster though after testing. But know I know what ParallelForDefered is used for.