callcc.py

import os
from multiprocessing import Pipe

class Continuation:
    def __init__(self, cont):
        self._cont = cont

    def __call__(self, arg):
        self._cont.send(arg)
        exit(0)


def call_cc(f):
    rx, tx = Pipe()
    pid = os.fork() # 🍴
    if pid:
        # 👨
        return f(Continuation(tx))
    else:
        # 👶
        return rx.recv()

global_k = None

def f(k):
    global global_k
    print("f called")
    global_k = k
    return 0

if __name__ == "__main__":
    print("f returns", call_cc(f))

    if global_k:
        global_k(1)