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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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Python/sysmodule.c
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@ -3335,6 +3335,8 @@ static PyStructSequence_Field flags_fields[] = {
{"safe_path", "-P"},
{"int_max_str_digits", "-X int_max_str_digits"},
{"gil", "-X gil"},
{"thread_inherit_context", "-X thread_inherit_context"},
{"context_aware_warnings", "-X context_aware_warnings"},
{0}
};
@ -3435,6 +3437,8 @@ set_flags_from_config(PyInterpreterState *interp, PyObject *flags)
#else
SetFlagObj(PyLong_FromLong(1));
#endif
SetFlag(config->thread_inherit_context);
SetFlag(config->context_aware_warnings);
#undef SetFlagObj
#undef SetFlag
return 0;