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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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6
Lib/test/test_embed.py
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@ -48,7 +48,7 @@ API_ISOLATED = 3
INIT_LOOPS = 4
MAX_HASH_SEED = 4294967295
ABI_THREAD = 't' if sysconfig.get_config_var('Py_GIL_DISABLED') else ''
ABI_THREAD = 't' if support.Py_GIL_DISABLED else ''
# PLATSTDLIB_LANDMARK copied from Modules/getpath.py
if os.name == 'nt':
PLATSTDLIB_LANDMARK = f'{sys.platlibdir}'
@ -58,6 +58,8 @@ else:
PLATSTDLIB_LANDMARK = (f'{sys.platlibdir}/python{VERSION_MAJOR}.'
f'{VERSION_MINOR}{ABI_THREAD}/lib-dynload')
DEFAULT_THREAD_INHERIT_CONTEXT = 1 if support.Py_GIL_DISABLED else 0
DEFAULT_CONTEXT_AWARE_WARNINGS = 1 if support.Py_GIL_DISABLED else 0
# If we are running from a build dir, but the stdlib has been installed,
# some tests need to expect different results.
@ -584,6 +586,8 @@ class InitConfigTests(EmbeddingTestsMixin, unittest.TestCase):
'tracemalloc': 0,
'perf_profiling': 0,
'import_time': False,
'thread_inherit_context': DEFAULT_THREAD_INHERIT_CONTEXT,
'context_aware_warnings': DEFAULT_CONTEXT_AWARE_WARNINGS,
'code_debug_ranges': True,
'show_ref_count': False,
'dump_refs': False,