gistfile1.py

"""Cached property multithreading test."""
from threading import Lock, Thread
from time import sleep
from cached_property import cached_property

COUNT = 0
COUNT_LOCK = Lock()
NUM_THREADS = 10

class Test(object):
    def __init__(self, val):
        self._val = val

    @cached_property
    def val(self):
        """Val getter."""
        sleep(1)
        global COUNT_LOCK, COUNT
        with COUNT_LOCK:
            COUNT = COUNT + 1
        return self._val

t = Test(5)
threads = []
for _ in range(NUM_THREADS):
    thread = Thread(target=lambda: t.val)
    thread.start()
    threads.append(thread)

for t in threads:
    t.join()

print "Cached method called", COUNT, "times"