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gh-128384: Use a context variable for warnings.catch_warnings (gh-130010)

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Make `warnings.catch_warnings()` use a context variable for holding
the warning filtering state if the `sys.flags.context_aware_warnings`
flag is set to true.  This makes using the context manager thread-safe in
multi-threaded programs.

Add the `sys.flags.thread_inherit_context` flag.  If true, starting a new
thread with `threading.Thread` will use a copy of the context
from the caller of `Thread.start()`.

Both these flags are set to true by default for the free-threaded build
and false for the default build.

Move the Python implementation of warnings.py into _py_warnings.py.

Make _contextvars a builtin module.

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
This commit is contained in:
Neil Schemenauer 2025-04-09 16:18:54 -07:00 • committed by GitHub
parent e5237541a0
commit d687900f98
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41 changed files with 1851 additions and 960 deletions
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8
Lib/test/test_support.py
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@ -54,23 +54,23 @@ def _caplog():
class TestSupport(unittest.TestCase):
@classmethod
def setUpClass(cls):
orig_filter_len = len(warnings.filters)
orig_filter_len = len(warnings._get_filters())
cls._warnings_helper_token = support.ignore_deprecations_from(
"test.support.warnings_helper", like=".*used in test_support.*"
)
cls._test_support_token = support.ignore_deprecations_from(
__name__, like=".*You should NOT be seeing this.*"
)
assert len(warnings.filters) == orig_filter_len + 2
assert len(warnings._get_filters()) == orig_filter_len + 2
@classmethod
def tearDownClass(cls):
orig_filter_len = len(warnings.filters)
orig_filter_len = len(warnings._get_filters())
support.clear_ignored_deprecations(
cls._warnings_helper_token,
cls._test_support_token,
)
assert len(warnings.filters) == orig_filter_len - 2
assert len(warnings._get_filters()) == orig_filter_len - 2
def test_ignored_deprecations_are_silent(self):
"""Test support.ignore_deprecations_from() silences warnings"""