多处理目标在父进程中按顺序运行

import os
import time

def task1():
    print("Task 1 started")
    time.sleep(2)
    print("Task 1 completed")

def task2():
    print("Task 2 started")
    time.sleep(1)
    print("Task 2 completed")

def task3():
    print("Task 3 started")
    time.sleep(3)
    print("Task 3 completed")

if __name__ == '__main__':
    # 创建子进程
    pid1 = os.fork()
    
    if pid1 == 0:
        # 子进程1执行任务1
        task1()
        os._exit(0)
    
    # 等待子进程1结束
    os.waitpid(pid1, 0)
    
    # 创建子进程2
    pid2 = os.fork()
    
    if pid2 == 0:
        # 子进程2执行任务2
        task2()
        os._exit(0)
    
    # 等待子进程2结束
    os.waitpid(pid2, 0)
    
    # 创建子进程3
    pid3 = os.fork()
    
    if pid3 == 0:
        # 子进程3执行任务3
        task3()
        os._exit(0)
    
    # 等待子进程3结束
    os.waitpid(pid3, 0)