Hi,

can anyone help me please with code bellow? The task is to run function device_a as new process, that will every second print setting value. I would like to change values for the function from the main code.
The problem with the code is, that it gets stucked until I enter new value in the input.

I appreciate any help, so here isthe code:

from multiprocessing import Process, Pipe
from time import sleep


def device_a(connection):

counter = 0

while True:
sleep(1)
t = connection.recv()
counter += 1
print('device_a at {} received: {}'.format(counter, t))

if __name__ == '__main__':

parent_conn, child_conn = Pipe()
p = Process(target=device_a, args=(child_conn,))
p.start()

while True:

setting = input('Enter a setting: ')
parent_conn.send(setting)

i am not entirely certain what you're trying to do, but using Manager to share the variable will probably get you closer to where you want to be.



This post was edited by cmetc1999 on Mar 6 2021 07:00pm

Thanks, so far your posted code does what I need. I am trying to run independently some external devices (motors, sensors, ect.) on my rapsberry pi, and from time to time want be albe to change the settings. Tried google before, and it suggested multiprocessing, which is pretty new for me (I do programming, and projects for fun).

Maybe there are some other ways to do it more effectively... have to do some more research.

use the ProcessPoolExecutor from concurrent.futures, it's very simple to use
https://docs.python.org/3/library/concurrent.futures.html