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Thu Mar 2 23:51:59 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-March/147526.html

in multiprocessing/forking.py#129, `os._exit` cause child process don't close open
file. For example:

```
    from multiprocessing import Process

    def f():
        global log  # prevent gc close the file
        log = open("info.log", "w")
        log.write("***hello world***\n")

    p = Process(target=f)
    p.start()
    p.join()

```
and the `info.log` will be empty. why not use sys.exit ? 

Thanks

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[Python-Dev] why multiprocessing use os._exit