test.py

import threading
import time
import random

import atomic

foo = 0


class Worker(threading.Thread):
    def run(self):
        global foo
        time.sleep(random.random())
        foo += 1 # atomic.int_add(foo, 1)
        print foo


def main():
    workers = {}
    for _ in range(10):
        thread = Worker()
        thread.start()
        workers[thread.name] = thread
    for _, worker in workers.items():
        worker.join()

if __name__ == '__main__':
    main()