求助,主线程开启副线程的问题

from socket import *
import os,sys
from multiprocessing import Process

"""
    UDP客户端
    协议:
        L:登陆
        C:聊天
        Q:退出
"""

ADDR = ('127.0.0.1',8888)
s = socket(AF_INET,SOCK_DGRAM)

def main():
    while True:
        name = input('请输入姓名>>')
        msg = 'L ' + name
        # 发送信息
        s.sendto(msg.encode(),ADDR)
        # 接收信息
        data,addr = s.recvfrom(128)
        print('收到信息:',data.decode())

        if data.decode() == 'OK':
            print('你已经入进聊天室',) # 下面如何开启副线程能进入到收消息函数,且不影响主线程下面的发消息
            p1 = Process(target=to_recv,name='收消息',args=(name,)) # 监听收消息
            p1.start()
            print(p1.name,p1.pid)
            to_send(name)
            #to_recv(name)
            return
        else:
            print(data.decode())

def to_recv(name): #收消息
    while True:
        data,addr = s.recvfrom(128)
        tmp = data.decode().split(' `')
        print(tmp[1])

def to_send(name): # 发消息
    while True:
        msg = input(name+"[q退出]>>")
        if msg == 'q':
            msg = 'Q '+name
            s.sendto(msg.encode(),ADDR)
            sys.exit()
        else:
            msg = 'C '+name+' '+ msg
            s.sendto(msg.encode(),ADDR)
        

main()