如何调度命令在多个非子进程完成后运行？

import multiprocessing

def worker(command, callback):
    # 执行非子进程的命令
    # ...

    # 执行完成后调用回调函数
    callback()

def main():
    commands = ['command1', 'command2', 'command3']  # 非子进程的命令列表
    results = multiprocessing.Queue()  # 用于存储非子进程的结果

    # 创建并发执行的非子进程
    processes = []
    for command in commands:
        process = multiprocessing.Process(target=worker, args=(command, results.put))
        processes.append(process)
        process.start()

    # 等待所有非子进程完成
    for process in processes:
        process.join()

    # 所有非子进程完成后执行后续命令
    # ...

if __name__ == '__main__':
    main()