#!/usr/bin/env python

import sys
import threading

def test_one_class(c):
    obj = c()
    e1 = threading.Event()
    e2 = threading.Event()

    def f1():
        obj.x = 'foo'
        e1.set()
        e2.wait()

    def f2():
        try:
            foo = obj.x
        except AttributeError:
            # This is expected -- we haven't set obj.x in this thread yet!
            sys.stderr.write('class %r: OK\n' % (c,))
        else:
            sys.stderr.write('Incorrectly got value %r from class %r\n'
                             % (foo, c))

    t1 = threading.Thread(target=f1)
    t1.start()
    e1.wait()
    t2 = threading.Thread(target=f2)
    t2.start()
    t2.join()

    # The test is done; just let t1 know it can exit, and wait for it.
    e2.set()
    t1.join()

class Subclass (threading.local):
    pass

test_one_class(threading.local)
test_one_class(Subclass)