koobas.hobune.stream
Delegates and "__ Can only be called from main thread"
Hey folks,
So I've run into a bit of a problem.
I'd like to use delegates and event handling in my Unity project to make my workflow much cleaner - however whenever an event is handle and I want it to do something I receive the error "___ Can only be called from the main thread. "
Does anyone have any experience with this? Work around?
Class Network()
public event ActionHandler Action;
public delegate void ActionHandler(string[] action);
private void ProcessAction(string[] message)
{
Action(message);
}
Class ActionManager()
void Start()
{
Network.Instance.Action += new Network.ActionHandler(OnActionReceived);
}
public void Action(string[] action)
{
if action[0] == 1
{
OpenDoor()
}
}
void OpenDoor()
{
this.animation.CrossFade("open_glassdoor");
}
Delegates are no problem, it depends on from where you invokre them. Unity uses a single thread for the whole scripting environment, that simplifies everything a lot. That means the whole Unity API is not thread safe. So whenever you access an object from unity or use a method from Unity it has to be invoked from the main thread.
So all depends on where you execute your delegate (the ProcessAction function).
(Btw i guess your "OnActionReceived" should be "Action" or the other way round)
Beside that you shouldn't name your class Network since Unity already defines a class Network.
This the old STA vs MTA problem. STA does not allow memory allocated on a thread from being manipulated by another thread. It's ham handed attempt at thread safety, but it is what it is.
For those not familiar with the acronyms, STA -> "single threaded apartment", $$anonymous$$TA -> "multi-threaded apartment"... from CO$$anonymous$$ ter$$anonymous$$ology.
