如何使用多线程将多个txt文件读入一个列表？

import os
import threading

def read_txt(file_path, result_list):
    with open(file_path, 'r') as file:
        content = file.read()
        result_list.append(content)

def read_files(file_list):
    result_list = []
    threads = []
    for file_path in file_list:
        thread = threading.Thread(target=read_txt, args=(file_path, result_list))
        threads.append(thread)
        thread.start()

    for thread in threads:
        thread.join()

    return result_list

file_list = ['file1.txt', 'file2.txt', 'file3.txt']
result = read_files(file_list)