threading if() problem

Questions & Answers
1

Hey!

Does anybody know what this error means?

CompareBaseObjectsInternal can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don’t use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

What I try to do is run a function inside a thread.
In this function I compare a variable inside one class to a variable of another class. Values are initialized by constructors before the function is even called.

I don’t seem to be using any of unity’s API. no calls similar to gameObject.name or getComponent() are there.

NODE COUNTER EDITOR

//NodeCounterEditor

//folowing function gets called from the OnInspectorGUI, get's fed a class LookFurtherArgs with 3 starting parameters

void LookFurther(object _work){
		
		LookFurtherargs _recieved = (LookFurtherargs)_work;
		
		GameObject currentNode = _recieved.current;
		GameObject cameFrom = _recieved.camefrom;
		
		NodeSpark _NScurrentNode = (NodeSpark)_recieved.carriedScript;
		
		
		
		if(remoteAdv > 0){
				//do something
					
		  for(int x = 0; x < _NScurrentNode.neighbours.Count; x++){
				
				//do something else
				
		    if(!BanCheck(check1) && check1 != cameFrom ){ //PROBLEMATIC AREA, BanCheck is a function returns true/false, not the cause of problem though.
					remoteAdv--;
				
					object _inPass = new LookFurtherargs(_NScurrentNode.neighbours[x],currentNode,_NScurrentNode._NSneighbour[x]);
					
					LookFurther(_inPass); //continue recursion with the neighbor that is available to explore
					remoteAdv++;
			}
			
	 }//end of if
}//end of function

LookFurtherArgs. used as a feeding object for a function LookFurther, that has to take 3 parameters, but thread only allows object, so we are using this class to shove it in that thread

using UnityEngine;
using System.Collections;

public class LookFurtherargs  {

	public  GameObject current;
	public  GameObject camefrom;
	public  NodeSpark carriedScript;
	
	public LookFurtherargs(GameObject x, GameObject c, NodeSpark j){
		current = x;
		camefrom = c;
		carriedScript = j;
	}//end of constructor
	
	public NodeSpark component(GameObject a){
		return a.GetComponent<NodeSpark>();
	}
}

finally, NodeSpark

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class NodeSpark : MonoBehaviour {

	public List<GameObject> neighbours  = new List<GameObject>();
	public List<string> accessN;	
	public List<BranchShell> pathHolder = new List<BranchShell>();
	
	 public List<NodeSpark> _NSneighbour = new List<NodeSpark>();
	
	public string carriedName; //simmilar to the one below
	
	public GameObject GO; //get's a value from NodeSparkEditor, during OnEnable(), through target as GameObject
	
}//end of class
2

The most probable cause here is that you are comparing two objects derived from UnityEngine.Object in this if. Unity doesn’t allow any api calls in different threads than the main one, which also includes the custom comparer unity uses on UnityEngine.Object derived things. If you do something like

GameObject a;
GameObject b;
...
if(a != b)

in another thread it will throw the given error.