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# test concurrent mutating access to a shared list object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
# the shared list
li = list()
# main thread function
def th(n, lo, hi):
for repeat in range(n):
for i in range(lo, hi):
li.append(i)
assert li.count(i) == repeat + 1
li.extend([i, i])
assert li.count(i) == repeat + 3
li.remove(i)
assert li.count(i) == repeat + 2
li.remove(i)
assert li.count(i) == repeat + 1
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, (4, i * 60, (i + 1) * 60))
# busy wait for threads to finish
while n_finished < n_thread:
pass
# check list has correct contents
li.sort()
print(li)
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