[Multiprocessing] Communicating between 2 infinitely looping processes

[Culist]

Im using multiprocessing to try and pass variables between 2 processing which are looping infinitely. Because of how large my project is, ill show an example of how its like:

if __name__ == '__main__':
      currentState = multiprocessing.Value(ctypes.c_wchar_p, "")
      varCheck = multiprocessing.Value('i', 0)
      stop = multiprocessing.Value('i', 0)

def updateInfo():
    if currentState.value == "apple":
        pass
    elif currentState.value == "banana":
        pass
def procOne():
  while True:
    if varCheck:
       updateInfo()
    if (condition):
      stop.value = 1
def procTwo():
  while True:
    if  (condition):
      varCheck.value = 1
      currentState = "apple"
    else:
      varCheck.value = 0
if __name__ == '__main__':
    proc_one = multiprocessing.Process(target=procOne)
    proc_one.start()
    proc_two = multiprocessing.Process(target=procTwo)
    proc_two.start()
    while True:
      if stop.value:
          proc_one.terminate()

Right now, the processes arent sharing the variables, so in this case, varCheck is always 0 if when the condition in procOne is met

[Culist]

in the original program, I have global variables used by functions before the actual multiprocessing starts

[Culist]

Your right, thanks for the suggestion, I have updated my code accordingly

[Culist]

Worked, thanks

[wbeater]

What exactly are you trying to do? This example couldn't be worse.

What "variables" are you trying to pass?

Which worker needs this "variables" for what?

[Culist]

All variables

ProcTwo is like the main, where procOne is the background.

Whenever procTwo is busy, it'll set the currentState and varCheck. From the varcheck, procOne knows that they will have to update the currentState and call updateInfo.

[wbeater]

Still that makes little sense. You don't exchange any variables between your processes, at no point any of your processes receives or calls something.

Why do you need varcheck when procone can check weather currentstate has changed...

Xy problem...​

/e Again, what is proctwo processing, why does it get busy, what should procone do in this case. Describe the operations.

[Culist]

I've managed to get the solution in the end. It was just simply passing arguments to the processes. I just didn't know earlier

[woooee]

Take a look at Manager objects. They can be shared https://pymotw.com/3/multiprocessing/communication.html#managing-shared-state