Python：标准库fcntl给打开的文件加锁

fcntl.flock(f.fileno(), operation)

# -*- coding: utf-8 -*-
import fcntl
import time
def lock(f):
    fcntl.flock(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
def un_lock(f):
    fcntl.flock(f, fcntl.LOCK_UN)
from multiprocessing import Process
def open_file():
    f = open('test.txt', 'r')
    lock(f) # 加锁
    print(f.read())
    time.sleep(3)
    un_lock(f)
    f.close()
Process(target=open_file).start()
Process(target=open_file).start()