如何将外部DLL限制为一个CPU？

import multiprocessing
import os
import ctypes

# 加载外部DLL
my_dll = ctypes.CDLL('path/to/your/dll')

# 定义一个进程锁
lock = multiprocessing.Lock()

def process_function():
    # 请求锁
    lock.acquire()

    # 调用DLL函数
    my_dll.my_function()

    # 释放锁
    lock.release()

# 创建多个进程
processes = [multiprocessing.Process(target=process_function) for _ in range(4)]

# 启动进程
for p in processes:
    p.start()

# 等待进程完成
for p in processes:
    p.join()