Question related to multiprocessing.Process

Chris Angelico rosuav at gmail.com
Sat Jan 19 06:05:07 CET 2013


On Sat, Jan 19, 2013 at 3:50 PM, Cen Wang <iwarobots at gmail.com> wrote:
> Hi, when I use multiprocessing.Process in this way:
>
> from multiprocessing import Process
>
> class MyProcess(Process):
>
>     def __init__(self):
>         Process.__init__(self)
>
>     def run(self):
>         print 'x'
>
> p = MyProcess()
> p.start()
>
> It just keeps printing 'x' on my command prompt and does not end. But I think MyProcess should print an 'x' and then terminate. I don't why this is happening. I'm using Win7 64 bit, Python 2.7.3. Any idea? Thanks in advance.

Multiprocessing on Windows requires that your module be importable. So
it imports your main module, which instantiates another MyProcess,
starts it, rinse and repeat. You'll need to protect your main routine
code:

if __name__=="__main__":
    p = MyProcess()
    p.start()

ChrisA



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