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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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2
PCbuild/pythoncore.vcxproj
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@ -421,7 +421,6 @@
</ClCompile>
<ClCompile Include="..\Modules\_codecsmodule.c" />
<ClCompile Include="..\Modules\_collectionsmodule.c" />
<ClCompile Include="..\Modules\_contextvarsmodule.c" />
<ClCompile Include="..\Modules\_csv.c" />
<ClCompile Include="..\Modules\_functoolsmodule.c" />
<ClCompile Include="..\Modules\_hacl\Hacl_Hash_MD5.c" />
@ -572,6 +571,7 @@
<ClCompile Include="..\PC\config.c" />
<ClCompile Include="..\PC\msvcrtmodule.c" />
<ClCompile Include="..\Python\pyhash.c" />
<ClCompile Include="..\Python\_contextvars.c" />
<ClCompile Include="..\Python\_warnings.c" />
<ClCompile Include="..\Python\asdl.c" />
<ClCompile Include="..\Python\assemble.c" />

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PCbuild/pythoncore.vcxproj.filters
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@ -1304,6 +1304,9 @@
<ClCompile Include="..\PC\msvcrtmodule.c">
<Filter>PC</Filter>
</ClCompile>
<ClCompile Include="..\Python\_contextvars.c">
<Filter>Python</Filter>
</ClCompile>
<ClCompile Include="..\Python\_warnings.c">
<Filter>Python</Filter>
</ClCompile>
@ -1571,9 +1574,6 @@
<ClCompile Include="..\Objects\odictobject.c">
<Filter>Objects</Filter>
</ClCompile>
<ClCompile Include="..\Modules\_contextvarsmodule.c">
<Filter>Modules</Filter>
</ClCompile>
<ClCompile Include="$(zlibDir)\adler32.c">
<Filter>Modules\zlib</Filter>
</ClCompile>