40 lines
762 B
Python
40 lines
762 B
Python
# test concurrent mutating access to a shared set object
|
|
#
|
|
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
|
|
|
|
import _thread
|
|
|
|
# the shared set
|
|
se = set([-1, -2, -3, -4])
|
|
|
|
|
|
# main thread function
|
|
def th(n, lo, hi):
|
|
for repeat in range(n):
|
|
for i in range(lo, hi):
|
|
se.add(i)
|
|
assert i in se
|
|
|
|
se.remove(i)
|
|
assert i not in se
|
|
|
|
with lock:
|
|
global n_finished
|
|
n_finished += 1
|
|
|
|
|
|
lock = _thread.allocate_lock()
|
|
n_thread = 4
|
|
n_finished = 0
|
|
|
|
# spawn threads
|
|
for i in range(n_thread):
|
|
_thread.start_new_thread(th, (50, i * 500, (i + 1) * 500))
|
|
|
|
# busy wait for threads to finish
|
|
while n_finished < n_thread:
|
|
pass
|
|
|
|
# check set has correct contents
|
|
print(sorted(se))
|