知道代码（持续更新）

1.科学家吃面代码

   此程序因互斥锁会产生死锁现象

from threading import Thread, Lock
import time
noodle_lock = Lock()
fork_lock = Lock()
def eat1(name):
    noodle_lock.acquire()
    print('%s在eat1拿到了面'%name)
    fork_lock.acquire()
    print('%s在eat1拿到了叉子'%name)
    print('%s在eat1吃面'%name)
    time.sleep(2)
    fork_lock.release()
    noodle_lock.release()
def eat2(name):
    fork_lock.acquire()
    print('%s在eat2拿到了叉子'%name)
    noodle_lock.acquire()
    print('%s在eat2拿到了面'%name)
    print('%s在eat2在吃面'%name)
    time.sleep(2)
    fork_lock.release()
    noodle_lock.release()
eat_lst = ['alex', 'wusir', '太白', 'yuan']
for name in eat_lst:
    Thread(target=eat1, args=(name,)).start()
    Thread(target=eat2, args=(name,)).start()

  可以通过递归锁（RLock）或改变代码逻辑解决死锁现象

 

2.多进程起socket

#服务器端
import socket
from multiprocessing import Process
def fanc(conn, num):
    try:
        while True:
            msg_s = '你好%s'% num
            conn.send(msg_s.encode('utf-8'))
            print(conn.recv(1024).decode('utf-8'))
    finally:
        conn.close()
if __name__ == '__main__':
    try:
        sk = socket.socket()
        sk.bind(('127.0.0.1', 9090))
        sk.listen()
        num = 0
        while True:
            conn, addr = sk.accept()
            num += 1
            p = Process(target=fanc, args=(conn,num))
            p.start()
    finally:
        sk.close()


#客户端
import os
import time
import socket
sk = socket.socket()
sk.connect(('127.0.0.1', 9090))
while True:
    print(sk.recv(1024).decode('utf-8'))
    sk.send(str(os.getpid()).encode('utf-8'))

  多线程与其相似

3.进程multiprocessing模块中事件Event红绿灯模型

# 红绿灯模型
# 控制交通灯的进程
import time
import random
from multiprocessing import Event,Process
def traffic_light(e):
    print('\033[1;31m 红灯亮\033[0m')
    while True:
        time.sleep(2)
        if e.is_set():
            print('\033[1;31m 红灯亮\033[0m')
            e.clear()
        else:
            print('\033[1;32m 绿灯亮\033[0m')
            e.set()


# 车 等或者通过
def car(id,e):
    if not e.is_set():
        print('car %s 等待' % id)
        e.wait()
    print('car %s 通过'%id)

def police_car(id,e):
    if not e.is_set():
        e.wait(timeout = 0.5)
    print('police car %s 通过' % id)

# 主进程 启动交通控制灯 启动车的进程
if __name__ == '__main__':
    e = Event()
    p = Process(target=traffic_light,args=(e,))
    p.start()
    car_lst = [car,police_car]
    for i in range(20):
        p = Process(target=random.choice(car_lst), args=(i,e))
        p.start()
        time.sleep(random.randrange(0,3,2))