Python multiprocessing: no output with while-loop in working function

Question

I am studying the Python multiprocessing module and do not understand why the following code does not print anything. Without a while loop, the program prints Worker_1 as expected.

import multiprocessing, time

def worker1():
    print 'Worker_1'
    while 1:
        print 'Worker_1'
        time.sleep(3)
    return

if __name__ == '__main__':
    jobs = []
    p = multiprocessing.Process(target=worker1)
    jobs.append(p)
    p.start()

Answer 1

On my system (Python 2.6 and 2.7 on Linux), this works as expected. What platform are you using? On some platforms (Windows), forkyou need to emulate by creating a completely new process and customizing it. I suspect that some are stdoutnot passed to the child process. Try:

• Threading module . This is enough if you just want to wait for the event in the stream.
• , POSIX, BSD, Linux Solaris

Answer 2

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