读取/写入同一文件的两个进程Python [英] Two processes reading/writing to the same file Python

问题描述

我有一个进程正在读取文件(使用file.read())，还有一个进程正在写入同一文件(file.write()).问题是它不起作用-我没有收到任何错误，但它们不能同时运行.我尝试使读取和写入操作无阻塞，然后刷新流，如下所示:

I have one process who's reading from a file (using file.read()) and one process who's writing to the same file (file.write()). The problem is it doesn't work - I get no errors but they can't operate at the same time. I've tried making the read and write operations none-blocking and then flushing the stream, as follows:

fcntl.fcntl(file, fcntl.F_SETFL, os.O_NONBLOCK)
file.write(msg)
file.flush()

我完全误会了吗?一个人应该如何完成从不同过程对一个文件的写入和读取?

Am I completely misunderstanding it? How should one accomplish writing and reading to one file from different processes?

推荐答案

test1.py

import os
f = open('txt.txt', 'a', os.O_NONBLOCK)
while 1:
        f.write('asd')
        f.flush()

test2.py

import os
f = open('txt.txt', 'r', os.O_NONBLOCK)
while 1:
    print f.read(3)

这对我来说很好.

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