import time
from concurrent.futures import ProcessPoolExecutor

a = 0


def aa():
    global a
    # print("aaaaaaaa", a)
    time.sleep(3)
    a += 1

def bb():
    global a
    print(a)

if __name__ == "__main__":
    with ProcessPoolExecutor(max_workers=3) as t:
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)
        t.submit(bb)
        t.submit(aa)