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gh-139759: Add test_unclosed_interpreter_on_fork #145545

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gh-139759: Add test_unclosed_interpreter_on_fork #145545

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7cfab1a
Add test_unclosed_interpreter_on_fork to cover gh-139759
aurelwildfellner Mar 5, 2026
1fdc86a
add ignore_fork_in_thread_deprecation_warnings() decorator to test.
aurelwildfellner Oct 23, 2026
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21 changes: 21 additions & 0 deletions Lib/test/test_interpreters/test_stress.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
import os
import threading
import unittest

from test import support
from test.support import import_helper
from test.support import threading_helper
from test.support import warnings_helper
# Raise SkipTest if subinterpreters not supported.
_interpreters = import_helper.import_module('_interpreters')
from concurrent import interpreters
Expand Down Expand Up @@ -82,6 +84,25 @@ def test_create_interpreter_no_memory(self):
with support.inject_memory_error_cm(0, 1):
_interpreters.create()

@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
@support.requires_fork()
def test_unclosed_interpreter_on_fork(self):
interp = interpreters.create()
interp.exec("pass")

fds = os.pipe()
pid = os.fork()

if pid == 0:
os.close(fds[0])
os.write(fds[1], b"OK")
os._exit(0)
else:
os.close(fds[1])
self.addCleanup(os.close, fds[0])
value = os.read(fds[0], 100)
self.assertEqual(value, b"OK")


if __name__ == '__main__':
# Test needs to be a package, so we can do relative imports.
Expand Down
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