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# test that we can run the garbage collector within threads
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import gc
import _thread
def thread_entry(n):
# allocate a bytearray and fill it
data = bytearray(i for i in range(256))
# do some work and call gc.collect() a few times
for i in range(n):
for i in range(len(data)):
data[i] = data[i]
gc.collect()
# check whether the data remains intact and indicate we are finished
with lock:
global n_correct, n_finished
n_correct += list(data) == list(range(256))
n_finished += 1
lock = _thread.allocate_lock()
n_thread = 0
n_thread_max = 4
n_correct = 0
n_finished = 0
# spawn threads
for _ in range(n_thread_max):
try:
_thread.start_new_thread(thread_entry, (10,))
n_thread += 1
except OSError:
# System cannot create a new thead, so stop trying to create them.
break
# also run the function on this main thread
thread_entry(10)
n_thread += 1
# busy wait for threads to finish
while n_finished < n_thread:
pass
print(n_correct == n_finished)
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