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vstinner bpo-39511: PyThreadState_Clear() calls on_delete (GH-18296) 
PyThreadState.on_delete is a callback used to notify Python when a
thread completes. _thread._set_sentinel() function creates a lock
which is released when the thread completes. It sets on_delete
callback to the internal release_sentinel() function. This lock is
known as Threading._tstate_lock in the threading module.

The release_sentinel() function uses the Python C API. The problem is
that on_delete is called late in the Python finalization, when the C
API is no longer fully working.

The PyThreadState_Clear() function now calls the
PyThreadState.on_delete callback. Previously, that happened in
PyThreadState_Delete().

The release_sentinel() function is now called when the C API is still
fully working.
Latest commit 4d96b46 Feb 1, 2020
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clinic Shorter docstring (GH-16322) Sep 21, 2019
Python-ast.c closes bpo-38648: Remove double tp_free slot in Python-ast.c. (GH-17002) Oct 31, 2019
README Issue #18093: Factor out the programs that embed the runtime Jul 25, 2014
_warnings.c bpo-39487: Merge duplicated _Py_IDENTIFIER identifiers in C code (GH-… Jan 30, 2020
asdl.c replace PY_SIZE_MAX with SIZE_MAX Sep 7, 2016
ast.c bpo-39235: Fix end location for genexp in call args (GH-17925) Jan 9, 2020
ast_opt.c Fix constant folding optimization for positional only arguments (GH-1… Jan 5, 2020
ast_unparse.c bpo-37050: Remove expr_text from FormattedValue ast node, use Constan… May 27, 2019
bltinmodule.c bpo-39200: Correct the error message for min/max builtin function (GH… Jan 10, 2020
bootstrap_hash.c Fix typos in comments, docs and test names (#15018) Jul 30, 2019
ceval.c bpo-39487: Merge duplicated _Py_IDENTIFIER identifiers in C code (GH-… Jan 30, 2020
ceval_gil.h Revert "bpo-33608: Factor out a private, per-interpreter _Py_AddPendi… Jun 3, 2019
codecs.c bpo-38631: Avoid Py_FatalError() in _PyCodecRegistry_Init() (GH-18217) Jan 27, 2020
compile.c bpo-39320: Handle unpacking of **values in compiler (GH-18141) Jan 27, 2020
condvar.h Typo fix: "throuhgh" should be "through". (GH-16704) Oct 11, 2019
context.c bpo-38979: fix ContextVar "__class_getitem__" method (GH-17497) Dec 8, 2019
dtoa.c bpo-36262: Fix _Py_dg_strtod() memory leak (goto undfl) (GH-12276) Mar 13, 2019
dup2.c bpo-32150: Expand tabs to spaces in C files. (#4583) Nov 28, 2017
dynamic_annotations.c bpo-32241: Add the const qualifire to declarations of umodifiable str… Dec 12, 2017
dynload_aix.c bpo-37752: Delete redundant Py_CHARMASK in normalizestring() (GH-15095) Sep 10, 2019
dynload_dl.c Issue #24268: Fix import naming when loading extension modules. Patch… May 23, 2015
dynload_hpux.c bpo-36900: Fix compilation on HP-UX (GH-13614) May 28, 2019
dynload_shlib.c bpo-36722: Debug build loads libraries built in release mode (GH-12952) Apr 25, 2019
dynload_stub.c Issue #13959: Re-implement imp.get_suffixes() in Lib/imp.py. May 4, 2012
dynload_win.c bpo-36266: Add module name in ImportError when DLL not found on Windo… Aug 17, 2019
errors.c bpo-39487: Merge duplicated _Py_IDENTIFIER identifiers in C code (GH-… Jan 30, 2020
fileutils.c bpo-38353: Add subfunctions to getpath.c (GH-16572) Oct 4, 2019
formatter_unicode.c Fix typo in formatter_unicode (GH-16831) Oct 25, 2019
frozen.c bpo-36540: PEP 570 -- Implementation (GH-12701) Apr 29, 2019
frozenmain.c bpo-38304: PyConfig_InitPythonConfig() cannot fail anymore (GH-16509) Oct 1, 2019
future.c bpo-34683: Make SyntaxError column offsets consistently 1-indexed (gh… Sep 24, 2018
getargs.c bpo-39028: Performance enhancement in keyword extraction (GH-17576) Dec 18, 2019
getcompiler.c closes bpo-31696: don't mention GCC in sys.version when building with… Oct 6, 2017
getcopyright.c Bring Python into the next decade. (GH-17801) Jan 3, 2020
getopt.c Delete stale comment in Python/getopt.c. (GH-14719) Aug 20, 2019
getplatform.c bpo-32150: Expand tabs to spaces in C files. (#4583) Nov 28, 2017
getversion.c bpo-32150: Expand tabs to spaces in C files. (#4583) Nov 28, 2017
graminit.c bpo-11410: Standardize and use symbol visibility attributes across PO… Oct 15, 2019
hamt.c closes bpo-37446: resolve undefined behavior in Python/hamt.c (GH-17727) Dec 31, 2019
import.c bpo-39487: Merge duplicated _Py_IDENTIFIER identifiers in C code (GH-… Jan 30, 2020
importdl.c bpo-36842: Implement PEP 578 (GH-12613) May 23, 2019
importdl.h PEP 489: Multi-phase extension module initialization May 23, 2015
importlib.h bpo-39320: Handle unpacking of **values in compiler (GH-18141) Jan 27, 2020
importlib_external.h bpo-39320: Handle unpacking of **values in compiler (GH-18141) Jan 27, 2020
importlib_zipimport.h bpo-39156: Break up COMPARE_OP into four logically distinct opcodes. (G… Jan 14, 2020
initconfig.c bpo-39427: Document -X opt options in the CLI --help and the man page (… Jan 23, 2020
makeopcodetargets.py makeopcodetargets.py: we need to import Lib/opcode.py Mar 26, 2016
marshal.c bpo-38823: Fix refleak in marshal init error path (GH-17260) Nov 20, 2019
modsupport.c bpo-36381: warn when no PY_SSIZE_T_CLEAN defined (GH-12473) Mar 23, 2019
mysnprintf.c Recorded merge of revisions 81032 via svnmerge from May 9, 2010
mystrtoul.c bpo-37752: Delete redundant Py_CHARMASK in normalizestring() (GH-15095) Sep 10, 2019
opcode_targets.h bpo-39320: Handle unpacking of **values in compiler (GH-18141) Jan 27, 2020
pathconfig.c bpo-39270: Remove dead assignment from config_init_module_search_paths ( Jan 9, 2020
peephole.c bpo-39156: Break up COMPARE_OP into four logically distinct opcodes. (G… Jan 14, 2020
preconfig.c bpo-38304: Remove PyConfig.struct_size (GH-16500) (GH-16508) Oct 1, 2019
pyarena.c bpo-36254: Fix invalid uses of %d in format strings in C. (GH-12264) Mar 13, 2019
pyctype.c Include files missed in r72044. Apr 27, 2009
pyfpe.c bpo-29137: Remove fpectl module (#4789) Jan 6, 2018
pyhash.c bpo-31849: Fix warning in pyhash.c (GH-6799) Jun 4, 2018
pylifecycle.c bpo-38644: Pass tstate to _Py_FinishPendingCalls() (GH-17990) Jan 13, 2020
pymath.c bpo-31031: Unify duplicate bits_in_digit and bit_length (GH-2866) Jan 16, 2020
pystate.c bpo-39511: PyThreadState_Clear() calls on_delete (GH-18296) Feb 1, 2020
pystrcmp.c
pystrhex.c Fix unused variable and signed/unsigned warnings (GH-15537) Aug 27, 2019
pystrtod.c bpo-38835: Don't use PyFPE_START_PROTECT and PyFPE_END_PROTECT (GH-17231 Nov 20, 2019
pythonrun.c bpo-38920: Add audit hooks for when sys.excepthook and sys.unraisable… Nov 28, 2019
pytime.c bpo-38068: Clean up gettimeofday configure logic. (GH-15775) Sep 10, 2019
strdup.c bpo-36623: Clean parser headers and include files (GH-12253) Apr 13, 2019
structmember.c Added the const qualifier to char* variables that refer to readonly i… Nov 20, 2016
symtable.c Fix SystemError when nested function has annotation on positional-onl… Jan 5, 2020
sysmodule.c bpo-38960: DTrace build fix for FreeBSD. (GH-17451) Jan 28, 2020
thread.c bpo-38096: Clean up the "struct sequence" / "named tuple" docs (GH-15895 Sep 11, 2019
thread_nt.h bpo-36084: Add native thread ID (TID) to threading.Thread (GH-13463) May 22, 2019
thread_pthread.h bpo-38852: Set thread stack size to 8 Mb for debug builds on android … Dec 8, 2019
traceback.c bpo-38070: _Py_DumpTraceback() writes <no Python frame> (GH-16244) Sep 17, 2019
wordcode_helpers.h bpo-31338 (#3374) Sep 15, 2017

README 

Miscellaneous source files for the main Python shared library
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