如何对字符串值进行重入锁？

import threading

# 创建全局互斥锁
lock = threading.RLock()

# 字符串值
string_value = "Hello, World!"

def modify_string():
    # 获取互斥锁
    lock.acquire()
    try:
        # 执行对字符串值的操作
        string_value += " Modified"
        print(string_value)
        # 调用其他需要互斥锁的函数
        another_function()
    finally:
        # 释放互斥锁
        lock.release()

def another_function():
    # 获取互斥锁
    lock.acquire()
    try:
        # 执行其他需要互斥锁的操作
        print("Another function")
    finally:
        # 释放互斥锁
        lock.release()

# 启动线程
t1 = threading.Thread(target=modify_string)
t2 = threading.Thread(target=modify_string)
t1.start()
t2.start()
t1.join()
t2.join()