| 12345678910111213141516171819202122232425262728293031323334353637 |
- # 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))
|
