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396f8b0b98
Fix a race in `PyMember_GetOne` and `PyMember_SetOne` for `Py_T_OBJECT_EX`.
These functions implement `__slots__` accesses for Python objects.
(cherry picked from commit 362cd2680b)
Co-authored-by: Daniele Parmeggiani <8658291+dpdani@users.noreply.github.com>
43 lines
1,001 B
Python
43 lines
1,001 B
Python
import threading
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from test.support import threading_helper
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from unittest import TestCase
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def run_in_threads(targets):
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"""Run `targets` in separate threads"""
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threads = [
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threading.Thread(target=target)
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for target in targets
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]
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for thread in threads:
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thread.start()
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for thread in threads:
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thread.join()
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@threading_helper.requires_working_threading()
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class TestSlots(TestCase):
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def test_object(self):
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class Spam:
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__slots__ = [
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"eggs",
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]
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def __init__(self, initial_value):
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self.eggs = initial_value
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spam = Spam(0)
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iters = 20_000
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def writer():
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for _ in range(iters):
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spam.eggs += 1
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def reader():
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for _ in range(iters):
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eggs = spam.eggs
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assert type(eggs) is int
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assert 0 <= eggs <= iters
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run_in_threads([writer, reader, reader, reader])
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