python 蟒蛇文件锁

Posted 2021-05-09

import os
import fcntl

class Lock(object):
    def __init__(self, filename):
        self.filename = filename
        self.handle = open(filename,'w')

    def acquire(self):
        # if you need a non-blocking lock, use fcntl.LOCK_NB
        fcntl.flock(self.handle, fcntl.LOCK_EX)

    def release(self):
        fcntl.flock(self.handle, fcntl.LOCK_UN)

    def __del__(self):
        self.handle.close()

'''
flask 对应的请求方法，当多个请求来时，调用该方法，将其变为单步执行
'''
def filelocktest():
    try:
        lock = Lock('./deploy_lock.tmp')
        lock.acquire()
        time.sleep(5)
        print('filelock is running')
    finally:
        lock.release()