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Sam Gross 6577d870b0
gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 
Align the QSBR thread state array to a 64-byte cache line boundary
and add padding at the end of _PyThreadStateImpl. Depending on heap
layout, the QSBR array could end up sharing a cache line with a
thread's tlbc_index, causing QSBR quiescent state updates to contend
with reads of tlbc_index in RESUME_CHECK. This is sensitive to
earlier allocations during interpreter init and can appear or
disappear with seemingly unrelated changes.

Either change alone is sufficient to fix the specific issue, but both
are worthwhile to avoid similar problems in the future.
2026-02-17 11:12:25 -05:00
..
clinic gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
frozen_modules gh-97669: Create Tools/build/ directory (#97963) 2022-10-17 12:01:00 +02:00
_contextvars.c gh-128384: Use a context variable for warnings.catch_warnings (gh-130010) 2025-04-09 16:18:54 -07:00
_warnings.c gh-135801: Improve filtering by module in warn_explicit() without module argument (GH-140151) 2025-10-30 15:55:39 +02:00
asdl.c bpo-43244: Remove ast.h, asdl.h, Python-ast.h headers (GH-24933) 2021-03-23 20:47:40 +01:00
asm_trampoline.S gh-136459: Add perf trampoline support for macOS (#136461) 2025-07-22 16:47:24 +01:00
assemble.c gh-87859: Track Code Object Local Kinds For Arguments (gh-132980) 2025-04-29 02:21:47 +00:00
ast.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
ast_preprocess.c gh-143055: Implementation of PEP 798 (#143056) 2026-01-30 20:37:52 -08:00
ast_unparse.c gh-132661: Disallow Template/str concatenation after PEP 750 spec update (#135996) 2025-07-21 08:44:26 +02:00
bltinmodule.c gh-141510, PEP 814: Add built-in frozendict type (#144757) 2026-02-17 10:54:41 +01:00
bootstrap_hash.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
brc.c Fix typos in documentation and comments (#119763) 2024-06-04 10:22:22 +00:00
bytecodes.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
ceval.c gh-138912: Improve MATCH_CLASS opcode performance (GH-138915) 2026-02-13 21:06:15 -08:00
ceval.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
ceval_gil.c GH-142513: Reimplement executor management (GH-142931) 2025-12-18 16:43:44 +00:00
ceval_macros.h gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
codecs.c Python/codecs.c: Remove unused forward declaration (#139511) 2025-10-03 13:33:49 +02:00
codegen.c gh-144822: remove redundant decref in codegen.c (#144823) 2026-02-14 19:20:33 +00:00
compile.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
condvar.h gh-104530: Enable native Win32 condition variables by default (GH-104531) 2024-02-02 13:50:51 +00:00
config_common.h gh-76785: Add PyInterpreterConfig Helpers (gh-117170) 2024-04-02 20:35:52 +00:00
context.c gh-116738: make entering of contextvars.Context thread safe (#143074) 2026-01-06 12:24:02 +05:30
critical_section.c gh-144513: Skip critical section locking during stop-the-world (gh-144524) 2026-02-06 15:14:08 +00:00
crossinterp.c gh-143377: fix crashes in _interpreters.capture_exception (#143418) 2026-01-10 12:37:54 +01:00
crossinterp_data_lookup.h gh-135443: Sometimes Fall Back to __main__.__dict__ For Globals (gh-135491) 2025-06-16 17:34:19 -06:00
crossinterp_exceptions.h gh-132775: Clean Up Cross-Interpreter Error Handling (gh-135369) 2025-06-13 16:45:21 -06:00
dtoa.c gh-131238: Add explicit includes to pycore headers (#131257) 2025-03-17 12:32:43 +01:00
dup2.c gh-108765: Python.h no longer includes <unistd.h> (#108783) 2023-09-02 16:50:18 +02:00
dynamic_annotations.c bpo-32241: Add the const qualifire to declarations of umodifiable strings. (#4748) 2017-12-12 13:55:04 +02:00
dynload_hpux.c gh-88402: Add new sysconfig variables on Windows (GH-110049) 2023-10-04 22:50:29 +00:00
dynload_shlib.c gh-131238: Remove more includes from pycore_interp.h (#131480) 2025-03-19 23:01:32 +01:00
dynload_stub.c gh-88402: Add new sysconfig variables on Windows (GH-110049) 2023-10-04 22:50:29 +00:00
dynload_win.c gh-131942: Use the Python-specific Py_DEBUG macro rather than _DEBUG in Windows-related C code (GH-131944) 2025-05-08 15:01:25 +00:00
emscripten_signal.c GH-108614: Unbreak emscripten build (GH-109132) 2023-09-08 17:54:45 +01:00
emscripten_syscalls.c gh-124621: Emscripten: Fix __syscall_ioctl patch (GH-136993) 2025-07-22 15:05:26 +02:00
emscripten_trampoline.c gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (#137470) 2025-09-17 15:33:55 +01:00
emscripten_trampoline_inner.c gh-128627: Use __builtin_wasm_test_function_pointer_signature for Emscripten trampoline (#137470) 2025-09-17 15:33:55 +01:00
errors.c gh-143547: Fix PyErr_FormatUnraisable() fallback (#143557) 2026-01-09 13:16:22 +01:00
executor_cases.c.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
fileutils.c gh-42400: Fix buffer overflow in _Py_wrealpath() for very long paths (#141529) 2025-11-18 17:34:58 +01:00
flowgraph.c GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
frame.c gh-144446: Fix some frame object thread-safety issues (gh-144479) 2026-02-06 09:43:36 -05:00
frozen.c GH-89435: os.path should not be a frozen module (#126924) 2024-11-22 18:50:30 +00:00
frozenmain.c Use PyConfig_Get() in frozenmain.c (#137421) 2025-08-06 14:33:28 +02:00
future.c gh-126139: Improve error message location for future statement with unknown feature (#126140) 2024-10-29 23:57:59 +00:00
gc.c gh-141070: Rename PyUnstable_Object_Dump to PyObject_Dump (GH-142848) 2026-01-16 09:19:43 -05:00
gc_free_threading.c gh-144054: no deferred refcount for untracked (gh-144081) 2026-01-20 10:01:09 -08:00
gc_gil.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
generated_cases.c.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
getargs.c Revert "gh-112068: C API: Add support of nullable arguments in PyArg_Parse (GH-121303)" (#136991) 2025-07-22 16:39:50 +03:00
getcompiler.c gh-141341: Rename COMPILER macro to _Py_COMPILER on Windows (#141342) 2025-11-10 15:50:51 +01:00
getcopyright.c gh-126133: Only use start year in PSF copyright, remove end years (#126236) 2024-11-12 15:59:19 +02:00
getopt.c GH-133336: Remove reserved `-J` flag for Jython (#133444) 2025-05-05 15:09:19 +00:00
getplatform.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
getversion.c gh-119132: Remove "experimental" tag from the CPython free-threading. (gh-135550) 2025-06-16 23:32:52 +09:00
hamt.c gh-142829: Fix use-after-free in Context.__eq__ via re-entrant ContextVar.set (#142905) 2026-01-09 17:57:34 +05:30
hashtable.c gh-111545: Add Py_HashPointer() function (#112096) 2023-12-06 15:09:22 +01:00
import.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
importdl.c gh-140011: Delete importdl assertion that prevents importing embedded modules from packages (GH-141605) 2025-11-26 14:12:49 +01:00
index_pool.c gh-91048: Refactor and optimize remote debugging module (#134652) 2025-05-25 20:19:29 +00:00
initconfig.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
instruction_sequence.c GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
instrumentation.c Remove redundant pycore_optimizer.h includes (#143184) 2025-12-26 11:11:11 +00:00
interpconfig.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
intrinsics.c gh-111489: Remove _PyTuple_FromArray() alias (#139973) 2025-10-11 22:58:14 +02:00
jit.c fix warnings in jit builds (GH-144817) 2026-02-14 17:39:10 +00:00
legacy_tracing.c gh-137400: Fix thread-safety issues when profiling all threads (gh-137518) 2025-08-13 14:15:12 -04:00
lock.c gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
marshal.c gh-141510, PEP 814: Add built-in frozendict type (#144757) 2026-02-17 10:54:41 +01:00
modsupport.c gh-137210: Add a struct, slot & function for checking an extension's ABI (GH-137212) 2025-09-05 16:23:18 +02:00
mysnprintf.c Add a warning message about PyOS_snprintf (#95993) 2022-10-07 11:49:53 -07:00
mystrtoul.c gh-108765: Python.h no longer includes <ctype.h> (#108831) 2023-09-03 18:54:27 +02:00
object_stack.c gh-100240: Use a consistent implementation for freelists (#121934) 2024-07-22 12:08:27 -04:00
opcode_targets.h gh-142982: Specialize CALL_FUNCTION_EX (GH-143391) 2026-01-06 20:34:08 +00:00
optimizer.c fix warnings in jit builds (GH-144817) 2026-02-14 17:39:10 +00:00
optimizer_analysis.c fix warnings in jit builds (GH-144817) 2026-02-14 17:39:10 +00:00
optimizer_bytecodes.c fix warnings in jit builds (GH-144817) 2026-02-14 17:39:10 +00:00
optimizer_cases.c.h fix warnings in jit builds (GH-144817) 2026-02-14 17:39:10 +00:00
optimizer_symbols.c GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
parking_lot.c gh-137433: Fix deadlock with stop-the-world and daemon threads (gh-137735) 2025-09-16 09:21:58 +01:00
pathconfig.c gh-133644: Remove deprecated Python initialization getter functions (#133661) 2025-05-09 11:39:23 +00:00
perf_jit_trampoline.c gh-144194: Fix mmap failure check in perf_jit_trampoline.c (#143713) 2026-01-28 13:30:17 +00:00
perf_trampoline.c gh-144766: Fix a crash in fork child process when perf support is enabled. (#144795) 2026-02-14 11:41:28 +00:00
preconfig.c GH-133711: Enable UTF-8 mode by default (PEP 686) (#133712) 2025-07-15 10:45:41 +01:00
pyarena.c Chore: Fix typo in pyarena.c (#126527) 2024-11-07 16:37:41 +01:00
pyctype.c Include files missed in r72044. 2009-04-27 20:54:42 +00:00
pyfpe.c bpo-46315: Add ifdef HAVE_ feature checks for WASI compatibility (GH-30507) 2022-01-13 09:46:04 +01:00
pyhash.c gh-111389: replace deprecated occurrences of _PyHASH_* macros (#141236) 2025-11-09 15:14:08 +01:00
pylifecycle.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pymath.c bpo-45440: Remove pymath.c fallbacks (GH-28977) 2021-10-15 19:45:34 +02:00
pystate.c gh-144068: fix JIT tracer memory leak when daemon thread exits (GH-144077) 2026-01-24 09:43:01 +00:00
pystats.c GH-135379: Top of stack caching for the JIT. (GH-135465) 2025-12-11 10:32:52 +00:00
pystrcmp.c gh-108767: Replace ctype.h functions with pyctype.h functions (#108772) 2023-09-01 18:36:53 +02:00
pystrhex.c gh-141370: Fix undefined behavior when using Py_ABS() (GH-141548) 2025-12-05 16:24:35 +02:00
pystrtod.c gh-141004: soft-deprecate Py_INFINITY macro (#141033) 2025-11-12 13:44:49 +01:00
Python-ast.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
Python-tokenize.c gh-111178: Fix function signatures for test_types (#131455) 2025-03-19 13:46:17 +00:00
pythonrun.c gh-141070: Rename PyUnstable_Object_Dump to PyObject_Dump (GH-142848) 2026-01-16 09:19:43 -05:00
pytime.c gh-80620: Support negative timestamps on windows in time.gmtime, time.localtime, and datetime module (#143463) 2026-01-15 10:51:11 +01:00
qsbr.c gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 2026-02-17 11:12:25 -05:00
README Issue #18093: Factor out the programs that embed the runtime 2014-07-25 21:52:14 +10:00
record_functions.c.h GH-144179: Use recorded values to make optimizer more robust (GH-144437) 2026-02-05 08:58:41 +00:00
remote_debug.h gh-144563: Fix remote debugging with duplicate libpython mappings from ctypes (#144595) 2026-02-10 10:04:50 +00:00
remote_debugging.c gh-138122: Implement frame caching in RemoteUnwinder to reduce memory reads (#142137) 2025-12-06 22:37:34 +00:00
specialize.c gh-142349: Fix refcount corruption in lazy import specialization (#144733) 2026-02-12 11:45:28 +00:00
stackrefs.c gh-131527: Stackref debug borrow checker (#140599) 2025-11-05 11:12:56 -08:00
stdlib_module_names.h gh-81313: Add the math.integer module (PEP-791) (GH-133909) 2025-10-31 16:13:43 +02:00
structmember.c gh-41779: Allow defining any __slots__ for a class derived from tuple (GH-141763) 2026-01-06 11:36:00 +02:00
suggestions.c GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
symtable.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
sysmodule.c gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
thread.c gh-134745: Use "pymutex" for sys.thread_info on Windows (#141140) 2025-11-06 16:10:39 +01:00
thread_nt.h gh-134745: Change PyThread_allocate_lock() implementation to PyMutex (#134747) 2025-05-30 10:15:47 +00:00
thread_pthread.h gh-137884: Added threading.get_native_id() on Illumos/Solaris (GH-137927) 2025-08-20 17:10:44 +00:00
thread_pthread_stubs.h gh-125161: return non zero value in pthread_self on wasi (#125303) 2024-10-13 20:59:41 +05:30
tier2_engine.md Docs: fix spelling of the word 'transferring' (#116641) 2024-03-13 23:53:32 +01:00
traceback.c gh-143108: Don't instrument some faulthandler related functions for TSan (#143450) 2026-01-05 22:13:29 +01:00
tracemalloc.c gh-143057: avoid locking in tracemalloc C-APIs when it is not enabled (#143065) 2025-12-22 21:08:07 +05:30
uniqueid.c gh-128923: Use zero to indicate unassigned unique id (#128925) 2025-01-17 16:42:27 +01:00
vm-state.md gh-133079: Remove Py_C_RECURSION_LIMIT & PyThreadState.c_recursion_remaining (GH-133080) 2025-04-29 12:56:20 +02:00

README 

Miscellaneous source files for the main Python shared library