Problems using multiprocessing.manager

Question

I was having some trouble using the manager. I want to have two processes accessing one list, one writing and one reading it. But the data was coming corrupted, so I tried to make an example to post here. Now, I have another problem. I'm passing a list as an argument to a function but the code doesn't work and says that I'm passing two arguments instead of one. Here is the code: import multiprocessing

def mde(dad):
    for i in range(100):
        for j in range(10):
            dad[0] = i
            dad[1] = j
def mda(dad):
    c = 0
    while c < 1001:
        print(dad)
        c += 1

if __name__ == '__main__':
    manager = multiprocessing.Manager()
    dado = manager.list([0, 0])
    print(dado)
    p1 = multiprocessing.Process(target=mde, args=dado)
    p2 = multiprocessing.Process(target=mda, args=dado)
    p1.start()
    p2.start()
    p1.join()
    p2.join()

Olvin Roght · Accepted Answer · 2020-02-12 19:56:45Z

1

Send your args as a tuple:

import multiprocessing
def mde(dad):
    for i in range(100):
        for j in range(10):
            dad[0] = i
            dad[1] = j
def mda(dad):
    c = 0
    while c < 1001:
        print(dad)
        c += 1

if __name__ == '__main__':
    manager = multiprocessing.Manager()
    dado = manager.list([0, 0])
    print(dado)
    p1 = multiprocessing.Process(target=mde, args=(dado,))
    p2 = multiprocessing.Process(target=mda, args=(dado,))
    p1.start()
    p2.start()
    p1.join()
    p2.join()

edited Feb 12, 2020 at 19:56

Olvin Roght

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answered Feb 12, 2020 at 19:50

Bendik Knapstad

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