Passing local variables to struct

Question

Hi! i am trying to implement the unity jobs function and as ive read i mus use struct in order to do so. My problem is this, on a controller script i am try to implement the job only for a specific very time consuming function.How can i pass my local variables that many other functions depend on to the struct function? An example of my script is this:

 namespace Something
 {
     public class Controller: MonoBehaviour
     {
 
 [...]
 
  public float Friction { get
             {
                 return friction;
             }
         }
 protected float friction = 0; // one of many vars
 
  public struct WhyGod : IJob
         {
             friction = 0; //i want this to be able to access the variable above
             public void Execute(){

Thanks in advance and sorry for my grammar.

Answer 1

That's completely impossible. Your friction variable is an instance variable so it belongs to a particular instance of that class. Your struct is a seperate type just like a class. So an "instance" of your struct can only access that variable when that struct has a reference to an actual instance of your Controller class.

You could make your variable static so it's not bound to a certain instance. However since your struct implements the IJob interface you probably want to use it in Unity's job system. In that case I would strongly recommend to not do anything like that since jobs are actually executed on seperate threads. So you could easily run into countless unpredictable race conditions.

Unity tries to simplify the usage of multithreading for the user. However knowing the fundamental rules and concepts about multi threading is still required. Otherwise, sooner or later, you will just shoot yourself in the foot.

Note that your code shows something completely different from what you're asking in your description. In your description you talk about reading the value inside your job while in the code you provided you try to write to that value. If you actually just want to read the value I would highly recommend to just add a member variable to your job and initialize it with the value of your friction variable before you start the job. The main point why Unity uses a struct instead of a class is to avoid concurrent data access. That means a job should contain all data it needs so it can actually run in isolation.

Passing local variables to struct

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