Python 多处理 - 进程终止(无法启动进程两次)

Python Multiprocessing - Process Termination (cannot start a process twice)

谁能告诉我为什么下面的代码会报错"cannot start a process twice"?根据我的估计,p1 和 p2 应该已经被 p.terminate() 命令

强制关闭了

编辑:添加了更多代码以提供上下文 - 想提出一个简单的示例但省略了 while 循环

import time
import os
from multiprocessing import Process
import datetime

def a():
    print ("a starting")
    time.sleep(30)
    print ("a ending")

def b():
    print ("b starting")
    time.sleep(30)
    print ("b ending")

morning = list(range(7,10))
lunch = list(range(11,14))
evening = list(range(17,21))
active = morning + lunch + evening

if __name__=='__main__':
    p1 = Process(target = a)
    p2 = Process(target = b)
    while True:
        while (datetime.datetime.now().time().hour) in active:
            p1.start()
            p2.start() 
            time.sleep(5)
            p1.terminate()
            p2.terminate()
            time.sleep(5)
        else:
            print ("Outside hours, waiting 30 mins before retry")
            time.sleep(1800)

它说你不能启动一个进程两次。这正是您在终止后再次调用 p1.start()p2.start() 时所做的。尝试像开始时那样重新创建它们。

p1.terminate()
p2.terminate()
time.sleep(5)
p1 = Process(target = a)
p2 = Process(target = b)
p1.start()
p2.start()