Message289454
It seems both me and many other people (judging from SO questions) are confused about whether it's ok to write this:
from multiprocessing import Process, Queue
q = Queue()
def f():
q.put([42, None, 'hello'])
def main():
p = Process(target=f)
p.start()
print(q.get()) # prints "[42, None, 'hello']"
p.join()
if __name__ == '__main__':
main()
It's not ok (doesn't work on Windows presumably because somehow when it's pickled, the connection between global queues in the two processes is lost; works on Linux, because I guess fork keeps more information than pickle, so the connection is maintained).
I thought it would be good to clarify in the docs that all the Queue() and Manager().* and other similar objects should be passed as parameters not just defined as globals. |
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Date |
User |
Action |
Args |
2017-03-11 19:25:49 | max | set | recipients:
+ max, docs@python |
2017-03-11 19:25:49 | max | set | messageid: <1489260349.05.0.251290010989.issue29795@psf.upfronthosting.co.za> |
2017-03-11 19:25:48 | max | link | issue29795 messages |
2017-03-11 19:25:48 | max | create | |
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