Multiprocessing - Shared Array

Question

So I\'m trying to implement multiprocessing in python where I wish to have a Pool of 4-5 processes running a method in parallel. The purpose of this is to run a total of tho

Answer 1

Not tested, but something like that should work. The array and lock are shared between processes.

from multiprocessing import Process, Array, Lock

def f(array, lock, n): #n is the dedicated location in the array
    lock.acquire()
    array[n]=-array[n]
    lock.release()

if __name__ == '__main__':
    size=100
    arr=Array('i', [3,-7])
    lock=Lock()
    p = Process(target=f, args=(arr,lock,0))
    q = Process(target=f, args=(arr,lock,1))
    p.start()
    q.start()
    q.join()
    p.join()

    print(arr[:])

the documentation here https://docs.python.org/3.5/library/multiprocessing.html has plenty of examples to start with