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# test that we can run the garbage collector within threads

#

# SPDX-FileCopyrightText: Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd

#

# SPDX-License-Identifier: MIT

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()

# print whether the data remains intact and indicate we are finished

with lock:

print(list(data) == list(range(256)))

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(thread_entry, (10,))

# busy wait for threads to finish

while n_finished < n_thread:

pass