就业DAY4_多任务_线程

 

 

 

import time
import threading
# 定义一个全局变量
def test(temp):
    temp.append(33)
    print("---in test g_num=%s" % str(temp))
def test2(temp):
    print("---in test2 g_num=%s" % str(temp))

g_nums = [11, 22]
def main():
    # target 指定将来这个线程去哪个函数执行代码
    # args 指定将来调用函数的时候传递什么数据过去
    t1 = threading.Thread(target=test, args=(g_nums,))
    t2 = threading.Thread(target=test2, args=(g_nums,))
    t1.start()
    time.sleep(1)
    t2.start()
    print("---in thread g_num=%s" % str(g_nums))
if __name__ == "__main__":
    main()

---in test g_num=[11, 22, 33]
---in test2 g_num=[11, 22, 33]
---in thread g_num=[11, 22, 33]

 

 

 

 使用互斥锁解决资源竞争的问题

import socket
import threading

def recv_msg(udp_socket):
    # 收到数据
    while True:
        recv_data = udp_socket.recvfrom(1024)
        print(recv_data)
def send_msg(udp_socket, dest_ip, dest_port):
    # 发送数据
    while True:
        send_data = input("输入要发送的数据")
        udp_socket.sendto(send_data.encode("gbk"), (dest_ip, dest_port))

def main():
    """完成udp聊天器的整体控制"""
    # 1 创建套接字
    udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    # 2  绑定端口
    udp_socket.bind(("",7890))

    # 3 获取对方的IP
    dest_ip = input("IP")
    dest_port = int(input("port"))

    # 4 创建两个进程执行相应的功能
    t1 = threading.Thread(target=recv_msg, args=(udp_socket,))
    t2 = threading.Thread(target=send_msg, args=(udp_socket, dest_ip, dest_port,))
    t1.start()
    t2.start()

if __name__ == "__main__":
    main()