https://github.com/python/cpython/commit/6b735023132a4ac9dc5b849d982104eeb1e8bdad
commit: 6b735023132a4ac9dc5b849d982104eeb1e8bdad
branch: main
author: Noam Cohen <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2025-05-20T16:20:25Z
summary:
gh-132542: Set native thread ID after fork (GH-132701)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-04-19-17-16-46.gh-issue-132542.7T_TY_.rst
M Lib/test/test_threading.py
M Lib/threading.py
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index b6e2d419019aa1..a9eec139bec8bf 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -1352,6 +1352,34 @@ def do_flush(*args, **kwargs):
''')
assert_python_ok("-c", script)
+ @skip_unless_reliable_fork
+ def test_native_id_after_fork(self):
+ script = """if True:
+ import threading
+ import os
+ from test import support
+
+ parent_thread_native_id = threading.current_thread().native_id
+ print(parent_thread_native_id, flush=True)
+ assert parent_thread_native_id == threading.get_native_id()
+ childpid = os.fork()
+ if childpid == 0:
+ print(threading.current_thread().native_id, flush=True)
+ assert threading.current_thread().native_id ==
threading.get_native_id()
+ else:
+ try:
+ assert parent_thread_native_id ==
threading.current_thread().native_id
+ assert parent_thread_native_id == threading.get_native_id()
+ finally:
+ support.wait_process(childpid, exitcode=0)
+ """
+ rc, out, err = assert_python_ok('-c', script)
+ self.assertEqual(rc, 0)
+ self.assertEqual(err, b"")
+ native_ids = out.strip().splitlines()
+ self.assertEqual(len(native_ids), 2)
+ self.assertNotEqual(native_ids[0], native_ids[1])
+
class ThreadJoinOnShutdown(BaseTestCase):
def _run_and_join(self, script):
diff --git a/Lib/threading.py b/Lib/threading.py
index 9feada3b8bb15b..fb9ef75d28111b 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -944,6 +944,8 @@ def _after_fork(self, new_ident=None):
# This thread is alive.
self._ident = new_ident
assert self._os_thread_handle.ident == new_ident
+ if _HAVE_THREAD_NATIVE_ID:
+ self._set_native_id()
else:
# Otherwise, the thread is dead, Jim. _PyThread_AfterFork()
# already marked our handle done.
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-04-19-17-16-46.gh-issue-132542.7T_TY_.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-04-19-17-16-46.gh-issue-132542.7T_TY_.rst
new file mode 100644
index 00000000000000..c69ce5efdedcca
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-04-19-17-16-46.gh-issue-132542.7T_TY_.rst
@@ -0,0 +1,2 @@
+Update :attr:`Thread.native_id <threading.Thread.native_id>` after
+:manpage:`fork(2)` to ensure accuracy. Patch by Noam Cohen.
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