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Bruce
Bruce

Reputation: 35213

Multiprocessing in Python on Windows

I am trying out the examples listed in the python docs http://docs.python.org/library/multiprocessing.html particularly these two on Windows:

1)

from multiprocessing import Process

def f(name):
    print 'hello', name

if __name__ == '__main__':
    p = Process(target=f, args=('bob',))
    p.start()
    p.join()

2)

from multiprocessing import Process
import os

def info(title):
    print title
    print 'module name:', __name__
    print 'parent process:', os.getppid()
    print 'process id:', os.getpid()

def f(name):
    info('function f')
    print 'hello', name

if __name__ == '__main__':
    info('main line')
    p = Process(target=f, args=('bob',))
    p.start()
    p.join()

Here is the problem: I don't get any output from the child process. It works on Linux though. What is going on?

Upvotes: 4

Views: 8321

Answers (1)

King
King

Reputation: 1200

example 1 works well.( I hope you saved the program in a file and then executed it else it will not recognise the function f at all).

example 2 won't work if u want the parent process's id. There is no getppid in windows.

Just take the print os.getppid and execute, its brilliant as ever !

Please refer this for more by Doug. (UPDATE: The original link isn't working, here is something similar.)

Upvotes: 2

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