from multiprocessing import Manager,Pool

def modify_dictionary(dictionary):
    if((3,3) not in dictionary):
        dictionary[(3,3)]=0.
    for i in range(100):
        dictionary[(3,3)] = dictionary[(3,3)]+1
    return 0

if __name__ == "__main__":

    manager = Manager()

    dictionary = manager.dict(lock=True)
    jobargs = [(dictionary) for i in range(5)]

    p = Pool(5)
    t = p.map(modify_dictionary,jobargs)
    p.close()
    p.join()

    print dictionary[(3,3)]

dictionary[(3,3)] = dictionary[(3,3)]+1

from multiprocessing import Manager,Pool,Lock

lock = Lock()

def modify_array(dictionary):
    if((3,3) not in dictionary):
        dictionary[(3,3)]=0.
    for i in range(100):
        with lock:
            dictionary[(3,3)] = dictionary[(3,3)]+1
    return 0

if __name__ == "__main__":

    manager = Manager()

    dictionary = manager.dict(lock=True)
    jobargs = [(dictionary) for i in range(5)]

    p = Pool(5)
    t = p.map(modify_array,jobargs)
    p.close()
    p.join()

    print dictionary[(3,3)]

from multiprocessing import Process, Manager, Pool, Lock
from functools import partial

def f(dictionary, l, k):
    with l:
        for i in range(100):
            dictionary[3] += 1

if __name__ == "__main__":
    manager = Manager()
    dictionary = manager.dict()
    lock = manager.Lock()

    dictionary[3] = 0
    jobargs = list(range(5))
    pool = Pool()
    func = partial(f, dictionary, lock)
    t = pool.map(func, jobargs)

    pool.close()
    pool.join()

    print(dictionary)