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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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10
Lib/test/test_decimal.py
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@ -45,6 +45,7 @@ from test.support import warnings_helper
import random
import inspect
import threading
import contextvars
if sys.platform == 'darwin':
@ -1726,8 +1727,13 @@ class ThreadingTest:
self.finish1 = threading.Event()
self.finish2 = threading.Event()
th1 = threading.Thread(target=thfunc1, args=(self,))
th2 = threading.Thread(target=thfunc2, args=(self,))
# This test wants to start threads with an empty context, no matter
# the setting of sys.flags.thread_inherit_context. We pass the
# 'context' argument explicitly with an empty context instance.
th1 = threading.Thread(target=thfunc1, args=(self,),
context=contextvars.Context())
th2 = threading.Thread(target=thfunc2, args=(self,),
context=contextvars.Context())
th1.start()
th2.start()