如何在多进程中更新Tkinter小部件？

from tkinter import *
import multiprocessing as mp

root = Tk()

def update_widget(widget, value):
    widget.config(text=value)

shared_var = mp.Value('i', 0)

def update_process(widget, shared_var):
    while True:
        value = shared_var.value
        update_widget(widget, value)

# 创建进程
p = mp.Process(target=update_process, args=(widget, shared_var))
p.start()

shared_var.value = new_value