Q: Making an equivalent to Roblox's wait() function?

[0xVB]

Long story short, I tried making my own wait function using lua_yield and a task scheduler. In short, the main thread will pcall the loaded luau chunks and if the execution result was LUA_YIELD, I add the thread/lua substate to the task scheduler, and it calls lua_resume on them next frame. However, whenever I call lua_yield, it throws the attempt to yield across C-boundary error. Is there a better way to do this?

My wait function:

int lua_wait(lua_State* L)
{
    closure_header();
    int tdelta = LuaToNum(L, 1);
    tdelta = (tdelta <= 0) ? 1 : tdelta;

    while (tdelta > 0)
    {
        tdelta--;
        lua_yield(L, 0);
    }

    return 0;
}

[0xVB]

I found the answer for those interested:

1. Don't use lua_pcall, use lua_resume instead, and;
2. Don't make your wait function a C function because lua can't just jump back in the middle of your C function unlike with lua functions.

Lua function:

function wait(t)
t = t or 0;
for i = 0, t do
coroutine.yield();
end;
end;