gh-111644: Fix support threading_cleanup() (GH-111714)
Copy the list of dangling threads to make sure that the list of
"Dangling thread" is complete. Previously, the list was incomplete if
threads completed just before the list was displayed.
Changes:
* Rewrite the warning to make it easier to understand.
* Use support.sleeping_retry().
* threading_cleanup() no longer copies threading._dangling,
but only counts the number of dangling thread.
* Remove support.gc_support() call.
(cherry picked from commit f62c7ccf9a)
Co-authored-by: Victor Stinner <vstinner@python.org>
Copy files from main to this branch:
* Lib/test/libregrtest/*.py
* Lib/test/__init__.py
* Lib/test/__main__.py
* Lib/test/autotest.py
* Lib/test/pythoninfo.py
* Lib/test/regrtest.py
* Lib/test/test_regrtest.py
Copy also changes from:
* Lib/test/support/__init__.py
* Lib/test/support/os_helper.py
* Lib/test/support/testresult.py
* Lib/test/support/threading_helper.py
* Lib/test/test_support.py
Do not modify scripts running tests such as Makefile.pre.in,
.github/workflows/build.yml or Tools/scripts/run_tests.py: do not use
--fast-ci and --slow-ci in this change.
Changes:
* SPLITTESTDIRS: don't include test_inspect.
* Add utils.process_cpu_count() using len(os.sched_getaffinity(0)).
* test_regrtest doesn't use @support.without_optimizer which doesn't
exist in Python 3.11.
* Add support.set_sanitizer_env_var().
* Update test_faulthandler to use support.set_sanitizer_env_var().
* @support.without_optimizer doesn't exist in 3.11.
* Add support.Py_DEBUG.
* regrtest.refleak: 3.11 doesn't have sys.getunicodeinternedsize.
