| 12345678910111213141516171819202122232425262728293031323334353637383940414243 |
- # test concurrent mutating access to a shared user instance
- #
- # MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
- import _thread
- # the shared user class and instance
- class User:
- def __init__(self):
- self.a = 'A'
- self.b = 'B'
- self.c = 'C'
- user = User()
- # main thread function
- def th(n, lo, hi):
- for repeat in range(n):
- for i in range(lo, hi):
- setattr(user, 'attr_%u' % i, repeat + i)
- assert getattr(user, 'attr_%u' % i) == repeat + i
- with lock:
- global n_finished
- n_finished += 1
- lock = _thread.allocate_lock()
- n_repeat = 30
- n_range = 50 # 300 for stressful test (uses more heap)
- n_thread = 4
- n_finished = 0
- # spawn threads
- for i in range(n_thread):
- _thread.start_new_thread(th, (n_repeat, i * n_range, (i + 1) * n_range))
- # busy wait for threads to finish
- while n_finished < n_thread:
- pass
- # check user instance has correct contents
- print(user.a, user.b, user.c)
- for i in range(n_thread * n_range):
- assert getattr(user, 'attr_%u' % i) == n_repeat - 1 + i
|
