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# test capability for threads to access a shared mutable data structure
# (without contention because they access different parts of the structure)
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import time
import _thread
def foo(lst, i):
lst[i] += 1
def thread_entry(n, lst, idx):
for i in range(n):
foo(lst, idx)
with lock:
global n_finished
n_finished += 1
lock = _thread.allocate_lock()
n_thread = 2
n_finished = 0
# the shared data structure
lst = [0, 0]
# spawn threads
for i in range(n_thread):
_thread.start_new_thread(thread_entry, ((i + 1) * 10, lst, i))
# busy wait for threads to finish
while n_finished < n_thread:
time.sleep(0)
print(lst)
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