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import unittest
from threading import Thread
from unittest import TestCase
from test.support import threading_helper
@threading_helper.requires_working_threading()
class TestCode(TestCase):
def test_code_attrs(self):
"""Test concurrent accesses to lazily initialized code attributes"""
code_objects = []
for _ in range(1000):
code_objects.append(compile("a + b", "<string>", "eval"))
def run_in_thread():
for code in code_objects:
self.assertIsInstance(code.co_code, bytes)
self.assertIsInstance(code.co_freevars, tuple)
self.assertIsInstance(code.co_varnames, tuple)
threads = [Thread(target=run_in_thread) for _ in range(2)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
if __name__ == "__main__":
unittest.main()
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