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29 lines
749 B
Python
29 lines
749 B
Python
import unittest
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from collections import deque
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from copy import copy
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from test.support import threading_helper
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threading_helper.requires_working_threading(module=True)
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class TestDeque(unittest.TestCase):
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def test_copy_race(self):
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# gh-144809: Test that deque copy is thread safe. It previously
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# could raise a "deque mutated during iteration" error.
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d = deque(range(100))
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def mutate():
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for i in range(1000):
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d.append(i)
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if len(d) > 200:
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d.popleft()
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def copy_loop():
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for _ in range(1000):
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copy(d)
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threading_helper.run_concurrently([mutate, copy_loop])
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if __name__ == "__main__":
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unittest.main()
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