如何在单个程序中执行特定数量的孤立进程和僵尸进程？

import os
import time
import multiprocessing

def child_process():
    print("Child process started. PID:", os.getpid())
    time.sleep(2)  # 模拟子进程执行的时间
    print("Child process finished. PID:", os.getpid())

def main_process(num_processes):
    print("Main process started. PID:", os.getpid())
    
    # 创建进程池
    pool = multiprocessing.Pool(num_processes)
    
    # 创建并启动子进程
    for _ in range(num_processes):
        pool.apply_async(child_process)
    
    pool.close()
    pool.join()
    
    print("Main process finished. PID:", os.getpid())

if __name__ == '__main__':
    num_processes = 5  # 指定要执行的子进程数量
    main_process(num_processes)