How to get all lua_states？

[heanrum]

For debug purpose, I need to get all running lua_states. In normal lua, we can traverse allgc in global_State to get it. But in luau the global_State doesn't have allgc, so how can I get all lua_states?

[vegorov-rbx]

There is no API to traverse all states.
There's actually no public API in Lua for this as well, looking into internal details might require rework on every update as that's not a stable API.
Starting from Lua 5.2, allgc doesn't actually link all collectible objects.

Anyway, you use luaM_visitgco.

luaM_visitgco(L, proto, [](void* context, lua_Page* page, GCObject* gco) {
    if (gco->gch.tt != LUA_TTHREAD)
        return false;

    lua_State* th = gco2th(gco);
    return false;
});