How to exit a function from another function? [duplicate]

Question

I want to exit a function in another function if statement is True. I am using multiprocessing so they are running concurrently.

I want to make something like this:

def A():
    while True:
        if condition is True:
            #do something
        else:
            True

def B():
    while True:
        if condition is True:
            #stop A() function
        else:
            True

def main():
    p1 = multiprocessing.Process(target=A())
    p2 = multiprocessing.Process(target=B())
    p1.start()
    p2.start()
    p1.join()
    p2.join()

if __name__ == '__main__':
    main()

What makes you think A() will be running simultaneously with B()? — Mathias R. Jessen
– Mathias R. Jessen, Commented Mar 7, 2023 at 14:15
Sorry, i don't quite understand. I use multiprocessing so they should run together... — Imperator Mazego
– Imperator Mazego, Commented Mar 7, 2023 at 14:18

Yannick Funk · Accepted Answer · 2023-03-07 14:25:06Z

1

There are multiple synchronization primitives you could use, such as a condition variable:

You could use a mp.Condition() calling

while not predicate():
    cv.wait()

in A() and notify() in B()

answered Mar 7, 2023 at 14:25

Yannick Funk

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3 Comments

Imperator Mazego Over a year ago

I need the A() function to run while waiting. Is that possible?

Yannick Funk Over a year ago

You could have a 3rd process running which destroys the process where A is running in as soon as the condition is fulfilled

Imperator Mazego Over a year ago

Can you provide an example?

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