CODEWITHSUNDEEP
pythonsubprocesspython-multiprocessing
crusarovid
crusarovid

Reputation: 541

Python: start new process that executes another object's method

I want to start a new process that will create some other object and then calls that objects loops_forever method.

I tried using Python's multiprocessing module as described in my previous SO question here: Python Multiprocessing calling object method

Here is what I tried:

import OtherService
from multiprocessing import Process
my_other_service = OtherService(address=ADDRESS)
my_other_process = Process(target=my_other_service.loops_forever)
my_other_process.start()

The problem with this solution is that the created object (OtherService) is not serializable and I get a "can't pickle _thread.lock object" error in the last line above.

How can I start a new process from my main class, and tell that process to create a new OtherService object (handing that process only the address parameter) and then tell that other process to call loops_forever?

Note that the solution doesnt have to use pythons multiprocessing, I will use whichever package makes most sense.

Upvotes: 0

Views: 1074

Answers (1)

bnaecker
bnaecker

Reputation: 6430

You've got the answer in your question, in English. You just have to translate it into code.

tell that process to create a new OtherService object (handing that process only the address parameter) and then tell that other process to call loops_forever?

Create a simple new function, which will take an address, create an OtherService object, and call its loops_forever() method. This function is what's passed as the target of the new process you create.

Like so:

def create_service_and_loop(address):
    service = OtherService(address)
    service.loops_forever()

proc = multiprocessing.Process(target=create_service_and_loop, args=(ADDRESS,))
proc.start()

Upvotes: 2

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