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08416065a7
Add `Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST` and
`Py_END_CRITICAL_SECTION_SEQUENCE_FAST` macros and update `str.join` to use
them. Also add a regression test that would crash reliably without this
patch.
(cherry picked from commit baf347d916)
Co-authored-by: Josh {*()} Rosenberg <26495692+MojoVampire@users.noreply.github.com>
75 lines
2 KiB
Python
75 lines
2 KiB
Python
import sys
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import unittest
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from itertools import cycle
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from threading import Event, Thread
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from unittest import TestCase
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from test.support import threading_helper
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@threading_helper.requires_working_threading()
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class TestStr(TestCase):
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def test_racing_join_extend(self):
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'''Test joining a string being extended by another thread'''
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l = []
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ITERS = 100
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READERS = 10
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done_event = Event()
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def writer_func():
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for i in range(ITERS):
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l.extend(map(str, range(i)))
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l.clear()
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done_event.set()
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def reader_func():
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while not done_event.is_set():
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''.join(l)
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writer = Thread(target=writer_func)
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readers = []
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for x in range(READERS):
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reader = Thread(target=reader_func)
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readers.append(reader)
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reader.start()
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writer.start()
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writer.join()
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for reader in readers:
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reader.join()
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def test_racing_join_replace(self):
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'''
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Test joining a string of characters being replaced with ephemeral
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strings by another thread.
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'''
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l = [*'abcdefg']
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MAX_ORDINAL = 1_000
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READERS = 10
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done_event = Event()
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def writer_func():
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for i, c in zip(cycle(range(len(l))),
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map(chr, range(128, MAX_ORDINAL))):
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l[i] = c
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done_event.set()
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def reader_func():
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while not done_event.is_set():
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''.join(l)
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''.join(l)
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''.join(l)
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''.join(l)
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writer = Thread(target=writer_func)
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readers = []
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for x in range(READERS):
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reader = Thread(target=reader_func)
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readers.append(reader)
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reader.start()
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writer.start()
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writer.join()
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for reader in readers:
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reader.join()
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if __name__ == "__main__":
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unittest.main()
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