Is it possible to call rust function from a new thread in Godot 4.2?

[AllenDang]

I define the rust class like this

#[derive(GodotClass)]
#[class(base=RefCounted)]
struct Test {
    base: Base<RefCounted>,
}

#[godot_api]
impl IRefCounted for Test {
    fn init(base: Base<RefCounted>) -> Self {
        Self {
            base,
        }
    }
}

#[godot_api]
impl Test {
    #[func]
    fn call_me_in_a_new_thread() {
        godot_print!("hello from another thread");
    }
}

In godot I tried to call the rust function like this

extends Node3D

var thread


func _ready() -> void:
	thread = Thread.new()
	thread.start(test)


# Thread must be disposed (or "joined"), for portability.
func _exit_tree():
	thread.wait_to_finish()


func test():
	var op = Test.new()
	op.call_me_in_a_new_thread()

It will cause an immediate crash. Is it possible to do that?

[lilizoey]

we currently havent figured out how to do this safely. see #18.

if you enable the experimental-threads feature then this shouldn't crash anymore. but you are then acknowledging that it's possible to break safety in subtle ways and it's up to you to enaure nothing bad happens.

[Bromeon]

Closing in favor of #18.