Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2026-04-20 19:01:14 +00:00
Code Issues Projects Releases Packages Wiki Activity
cpython/Include/internal
History
Gregory P. Smith 64afa947f4
gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion (GH-146303) 
## Summary

- Move the `runtime->initialized = 1` store from before `site.py` import to the end of `init_interp_main()`, so `Py_IsInitialized()` only returns true after initialization has fully completed
- Access `initialized` and `core_initialized` through new inline accessors using acquire/release atomics, to also protect from data race undefined behavior
- `PySys_AddAuditHook()` now uses the accessor, so with the flag move it correctly skips audit hook invocation during all init phases (matching the documented "after runtime initialization" behavior) ... We could argue that running these earlier would be good even if the intent was never explicitly expressed, but that'd be its own issue.

## Motivation

`Py_IsInitialized()` returned 1 while `Py_InitializeEx()` was still running — specifically, before `site.py` had been imported. See https://github.com/PyO3/pyo3/issues/5900 where a second thread could acquire the GIL and start executing Python with an incomplete `sys.path` because `site.py` hadn't finished.

The flag was also a plain `int` with no atomic operations, making concurrent reads a C-standard data race, though unlikely to manifest.

## Regression test:

The added test properly fails on `main` with `ERROR: Py_IsInitialized() was true during site import`.

---

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-11 21:54:23 +00:00
..
mimalloc gh-144490: Fix mimalloc debug build for C++ (#144620) 2026-02-10 11:56:52 +01:00
pycore_abstract.h gh-135763: AC: Implement `allow_negative for Py_ssize_t` (#138150) 2025-09-01 22:55:22 +01:00
pycore_asdl.h
pycore_ast.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_ast_state.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_atexit.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_audit.h gh-125604: Move _Py_AuditHookEntry, etc. Out of pycore_runtime.h (gh-125605) 2024-10-18 09:26:08 -06:00
pycore_backoff.h gh-127958: Trace from RESUME in the JIT (GH-145905) 2026-03-17 00:18:59 +08:00
pycore_bitutils.h
pycore_blocks_output_buffer.h gh-139877: Use PyBytesWriter in pycore_blocks_output_buffer.h (#139976) 2025-10-14 10:03:55 -07:00
pycore_brc.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_bytes_methods.h gh-71679: Share the repr implementation between bytes and bytearray (GH-138181) 2025-09-17 11:10:29 +03:00
pycore_bytesobject.h gh-139871: Add bytearray.take_bytes([n]) to efficiently extract bytes (GH-140128) 2025-11-13 13:19:44 +00:00
pycore_c_array.h gh-130080: move _Py_EnsureArrayLargeEnough to a separate header so it can be used outside of the compiler (#130930) 2025-03-13 16:02:58 +00:00
pycore_call.h gh-145779: Improve classmethod/staticmethod scaling in free-threaded build (#145826) 2026-03-17 14:24:44 -04:00
pycore_capsule.h
pycore_cell.h gh-144490: Fix C++ compatibility in pycore_cell.h (GH-144482) 2026-02-06 22:11:58 -05:00
pycore_ceval.h gh-148171: Convert CALL_BUILTIN_CLASS to leave arguments on the stack (gh-148381) 2026-04-11 23:01:25 +09:00
pycore_ceval_state.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_code.h gh-100239: Propagate type info through _BINARY_OP_EXTEND in tier 2 (GH-148146) 2026-04-06 20:52:42 +08:00
pycore_codecs.h gh-131238: Remove pycore_lock.h includes (#131483) 2025-03-19 23:46:25 +00:00
pycore_compile.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_complexobject.h gh-128813: hide mixed-mode functions for complex arithmetic from C-API (#131703) 2025-04-22 14:18:18 +02:00
pycore_condvar.h gh-131082: Add missing guards for WIN32_LEAN_AND_MEAN (#131044) 2025-03-11 12:33:01 +01:00
pycore_context.h gh-140414: streamline thread state access in asyncio (#142742) 2025-12-15 16:57:51 +05:30
pycore_critical_section.h gh-144969: Document that the free threading GC can change ob_tid (#144972) 2026-02-19 01:49:09 +01:00
pycore_crossinterp.h gh-148072: Cache pickle.dumps/loads per interpreter in XIData (GH-148125) 2026-04-06 11:37:02 -04:00
pycore_crossinterp_data_registry.h gh-132775: Support Fallbacks in _PyObject_GetXIData() (gh-133482) 2025-05-21 07:23:48 -06:00
pycore_debug_offsets.h GH-146527: Add more data to GC statistics and add it to PyDebugOffsets (#146532) 2026-03-28 18:52:10 +00:00
pycore_descrobject.h gh-41779: Allow defining any __slots__ for a class derived from tuple (GH-141763) 2026-01-06 11:36:00 +02:00
pycore_dict.h gh-146558: JIT optimize dict access for objects with known hash (#146559) 2026-03-30 14:23:29 +00:00
pycore_dict_state.h gh-124296: Remove private dictionary version tag (PEP 699) (#124472) 2024-10-01 12:39:56 -04:00
pycore_dtoa.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_emscripten_signal.h
pycore_emscripten_trampoline.h gh-145037: Fix Emscripten trampoline with emcc >= 4.0.19 (#145038) 2026-02-26 06:21:05 +08:00
pycore_exceptions.h gh-129668: Fix thread-safety of MemoryError freelist in free threaded build (gh-129704) 2025-02-06 12:38:12 -05:00
pycore_faulthandler.h gh-127604: Add C stack dumps to faulthandler (#128159) 2025-04-21 20:48:02 +01:00
pycore_fileutils.h gh-131238: Use pycore_interp_structs.h header (#131481) 2025-03-19 23:13:25 +00:00
pycore_fileutils_windows.h
pycore_floatobject.h gh-145633: Remove support for ancient ARM platforms with mixed-endian doubles (#145634) 2026-03-11 12:39:24 +01:00
pycore_flowgraph.h GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
pycore_format.h
pycore_frame.h gh-120321: Add gi_state, cr_state, and ag_state attributes (gh-144409) 2026-02-03 13:06:32 -05:00
pycore_freelist.h gh-140544: store pointer to interpreter state as a thread local for fast access (#140573) 2025-10-25 19:56:07 +05:30
pycore_freelist_state.h gh-129813, PEP 782: Add PyBytesWriter C API (#138822) 2025-09-12 13:41:59 +02:00
pycore_function.h gh-145779: Improve classmethod/staticmethod scaling in free-threaded build (#145826) 2026-03-17 14:24:44 -04:00
pycore_gc.h GH-139951: Fix major GC performance regression (GH-140262) 2025-10-21 15:22:15 +01:00
pycore_genobject.h gh-120321: Make gen.gi_frame.clear() thread-safe (gh-143112) 2026-01-08 14:45:54 -05:00
pycore_getopt.h
pycore_gil.h gh-116322: Enable the GIL while loading C extension modules (#118560) 2024-05-06 23:07:23 -04:00
pycore_global_objects.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_global_objects_fini_generated.h gh-73613: Support Base32 and Base64 without padding (GH-147974) 2026-04-04 21:26:16 +03:00
pycore_global_strings.h gh-73613: Support Base32 and Base64 without padding (GH-147974) 2026-04-04 21:26:16 +03:00
pycore_hamt.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_hashtable.h
pycore_import.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_importdl.h gh-141169: Re-raise exception from findfuncptr (GH-141349) 2025-11-11 13:52:13 +01:00
pycore_index_pool.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_initconfig.h gh-116749: Fix code comment for _PyConfig_GIL_DEFAULT (gh-141804) 2025-11-24 10:42:00 -05:00
pycore_instruction_sequence.h GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569) 2026-01-16 09:11:58 +00:00
pycore_instruments.h gh-148037: remove critical section from PyCode_Addr2Line (#148103) 2026-04-10 17:58:17 +05:30
pycore_interp.h gh-131238: Remove includes from pycore_interp.h (#131495) 2025-03-20 11:35:23 +00:00
pycore_interp_structs.h gh-146527: Heap-allocate gc_stats to avoid bloating PyInterpreterState (#148057) 2026-04-04 18:42:30 +01:00
pycore_interpframe.h gh-148144: Initialize visited on copied interpreter frames (#148143) 2026-04-06 00:23:07 +01:00
pycore_interpframe_structs.h GH-140643: Add <native> and <GC> frames to the sampling profiler (#141108) 2025-11-17 13:39:00 +00:00
pycore_interpolation.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_intrinsics.h gh-116126: Implement PEP 696 (#116129) 2024-05-03 06:17:32 -07:00
pycore_jit.h GH-126910: add test for manual frame unwinding (#144137) 2026-01-27 13:17:40 +00:00
pycore_lazyimportobject.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_list.h gh-144569: Avoid creating temporary objects in BINARY_SLICE for list, tuple, and unicode (GH-144590) 2026-03-02 17:02:38 +00:00
pycore_llist.h gh-111964: Implement stop-the-world pauses (gh-112471) 2024-01-23 11:08:23 -07:00
pycore_lock.h gh-120321: Make gi_yieldfrom thread-safe in free-threading build (#144292) 2026-01-30 12:20:27 -05:00
pycore_long.h gh-143050: Add helper _PyLong_InitTag() (#147956) 2026-04-01 21:42:10 +00:00
pycore_magic_number.h GH-145667: Merge GET_ITER and GET_YIELD_FROM_ITER (GH-146120) 2026-03-21 10:48:13 +00:00
pycore_memoryobject.h gh-132776: Revert Moving memoryview XIData Code to memoryobject.c (gh-132960) 2025-04-25 16:43:50 +00:00
pycore_mimalloc.h gh-122584: Import mimalloc headers in a C++ context (#122587) 2024-08-15 09:01:01 -04:00
pycore_mmap.h gh-142419: Add mmap.set_name method for user custom annotation (gh-142480) 2025-12-18 23:33:49 +09:00
pycore_modsupport.h gh-129594: Remove redundant check on varargs in _PyArg_CheckPositional (#129595) 2025-05-26 10:51:12 +02:00
pycore_moduleobject.h gh-145921: Add "_DuringGC" functions for tp_traverse (GH-145925) 2026-04-08 09:15:11 +02:00
pycore_namespace.h
pycore_object.h gh-146175: Soft-deprecate outdated macros; convert internal usage (GH-146178) 2026-03-23 12:42:09 +01:00
pycore_object_alloc.h gh-112529: Use GC heaps for GC allocations in free-threaded builds (gh-114157) 2024-01-21 01:14:45 +09:00
pycore_object_deferred.h gh-117139: Convert the evaluation stack to stack refs (#118450) 2024-06-27 03:10:43 +08:00
pycore_object_stack.h gh-125859: Fix crash when gc.get_objects is called during GC (#125882) 2024-10-24 09:33:11 -04:00
pycore_object_state.h gh-125604: Move _Py_AuditHookEntry, etc. Out of pycore_runtime.h (gh-125605) 2024-10-18 09:26:08 -06:00
pycore_obmalloc.h Note out-of-date obmalloc comments (#148149) 2026-04-06 23:08:47 -05:00
pycore_obmalloc_init.h gh-113055: Use pointer for interp->obmalloc state (gh-113412) 2024-01-26 19:38:14 -08:00
pycore_opcode_metadata.h gh-148276: Optimize object creation and method calls in the JIT by resolving __init__ at trace optimization time (GH-148277) 2026-04-11 22:22:42 +08:00
pycore_opcode_utils.h GH-145667: Merge GET_ITER and GET_YIELD_FROM_ITER (GH-146120) 2026-03-21 10:48:13 +00:00
pycore_optimizer.h gh-148083: Prevent constant folding when lhs is container types (gh-148090) 2026-04-05 00:40:12 +09:00
pycore_optimizer_types.h gh-131798: split recursion check to _CHECK_RECURSION_LIMIT and combine checks (GH-148070) 2026-04-04 17:23:03 +08:00
pycore_parking_lot.h gh-110850: Cleanup pycore_time.h includes (#115724) 2024-02-20 16:50:43 +00:00
pycore_parser.h gh-122581: Use parser mutex in default build for subinterpreters (gh-142959) 2025-12-20 15:37:31 -05:00
pycore_pathconfig.h
pycore_pyarena.h
pycore_pyatomic_ft_wrappers.h gh-145685: Improve scaling of type attribute lookups (gh-145774) 2026-03-12 13:30:36 -04:00
pycore_pybuffer.h gh-76785: Rename _xxsubinterpreters to _interpreters (gh-117791) 2024-04-24 16:18:24 +00:00
pycore_pyerrors.h gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911) 2026-01-16 10:33:29 -08:00
pycore_pyhash.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_pylifecycle.h gh-136421: Load _datetime static types during interpreter initialization (GH-136583) 2025-07-21 13:47:26 -04:00
pycore_pymath.h gh-145633: Remove support for ancient ARM platforms with mixed-endian doubles (#145634) 2026-03-11 12:39:24 +01:00
pycore_pymem.h gh-116008: Detect freed thread state in faulthandler (#141988) 2025-11-27 12:35:00 +01:00
pycore_pymem_init.h gh-144914: use mimalloc for raw allocations on free-threading (#144916) 2026-02-18 04:16:27 +00:00
pycore_pystate.h GH-126910: Revert "Make _Py_get_machine_stack_pointer return the stack pointer (#147945)" (GH-147994) 2026-04-02 16:53:09 +02:00
pycore_pystats.h gh-131253: free-threaded build support for pystats (gh-137189) 2025-11-03 11:36:37 -08:00
pycore_pythonrun.h GH-126910: Revert "Make _Py_get_machine_stack_pointer return the stack pointer (#147945)" (GH-147994) 2026-04-02 16:53:09 +02:00
pycore_pythread.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_qsbr.h gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 2026-02-17 11:12:25 -05:00
pycore_range.h
pycore_runtime.h gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion (GH-146303) 2026-04-11 21:54:23 +00:00
pycore_runtime_init.h gh-145633: Remove support for ancient ARM platforms with mixed-endian doubles (#145634) 2026-03-11 12:39:24 +01:00
pycore_runtime_init_generated.h gh-73613: Support Base32 and Base64 without padding (GH-147974) 2026-04-04 21:26:16 +03:00
pycore_runtime_structs.h gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion (GH-146303) 2026-04-11 21:54:23 +00:00
pycore_semaphore.h gh-137433: Fix deadlock with stop-the-world and daemon threads (gh-137735) 2025-09-16 09:21:58 +01:00
pycore_setobject.h gh-130312: SET_ADD should not lock (#130136) 2025-03-21 15:58:32 -07:00
pycore_signal.h gh-109693: Use pyatomic.h for signal module (gh-110480) 2023-10-10 08:26:29 +09:00
pycore_sliceobject.h GH-115802: JIT "small" code for Windows (GH-115964) 2024-02-29 08:11:28 -08:00
pycore_stackref.h gh-148171: Convert CALL_BUILTIN_FAST to leave inputs on the stack for refcount elimination in JIT (GH-148172) 2026-04-10 23:11:18 +08:00
pycore_stats.h gh-131253: free-threaded build support for pystats (gh-137189) 2025-11-03 11:36:37 -08:00
pycore_strhex.h gh-147944: Increase range of bytes_per_sep (GH-147946) 2026-04-01 08:33:30 +00:00
pycore_structs.h GH-131498: Cases generator: manage stacks automatically (GH-132074) 2025-04-04 17:59:36 +01:00
pycore_structseq.h
pycore_symtable.h gh-142349: Implement PEP 810 - Explicit lazy imports (#142351) 2026-02-12 00:15:33 +00:00
pycore_sysmodule.h gh-108512: Add and use new replacements for PySys_GetObject() (GH-111035) 2025-05-28 20:11:09 +03:00
pycore_template.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_time.h Remove internal _PyTime_AsLong() function (#141053) 2025-11-05 18:37:06 +01:00
pycore_token.h gh-132661: Implement PEP 750 (#132662) 2025-04-30 11:46:41 +02:00
pycore_traceback.h gh-125434: Display thread name in faulthandler on Windows (#140675) 2025-10-27 18:41:18 +01:00
pycore_tracemalloc.h gh-143057: avoid locking in tracemalloc C-APIs when it is not enabled (#143065) 2025-12-22 21:08:07 +05:30
pycore_tstate.h gh-144438: Fix false sharing between QSBR and tlbc_index (gh-144554) 2026-02-17 11:12:25 -05:00
pycore_tuple.h gh-143414: Implement unique reference tracking for JIT, optimize unpacking of such tuples (GH-144300) 2026-03-23 00:57:23 +08:00
pycore_typedefs.h gh-130931: Add pycore_typedefs.h internal header (#131396) 2025-03-19 15:23:32 +01:00
pycore_typeobject.h gh-131798: fold super method lookups in JIT (#148231) 2026-04-09 13:25:01 +05:30
pycore_typevarobject.h gh-119180: Add evaluate functions for type params and type aliases (#122212) 2024-07-27 17:24:10 +00:00
pycore_ucnhash.h gh-111972: Make Unicode name C APIcapsule initialization thread-safe (#112249) 2023-11-30 11:12:49 +01:00
pycore_unicodectype.h gh-129117: Add unicodedata.isxidstart() function (#140269) 2025-10-30 10:18:12 +00:00
pycore_unicodeobject.h gh-103997: Remove incorrect statements about -c dedenting (gh-138624) 2026-03-10 09:56:00 +01:00
pycore_unicodeobject_generated.h gh-73613: Support Base32 and Base64 without padding (GH-147974) 2026-04-04 21:26:16 +03:00
pycore_unionobject.h gh-105499: Merge typing.Union and types.UnionType (#105511) 2025-03-04 11:44:19 -08:00
pycore_uniqueid.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_uop.h gh-144888: JIT executor bloom filter wide-type optimization and function Inlining (GH-146114) 2026-03-19 00:58:14 +08:00
pycore_uop_ids.h gh-148171: Convert CALL_BUILTIN_CLASS to leave arguments on the stack (gh-148381) 2026-04-11 23:01:25 +09:00
pycore_uop_metadata.h gh-148171: Convert CALL_BUILTIN_CLASS to leave arguments on the stack (gh-148381) 2026-04-11 23:01:25 +09:00
pycore_warnings.h GH-131238: Core header refactor (GH-131250) 2025-03-17 09:19:04 +00:00
pycore_weakref.h gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) 2025-06-30 11:14:31 +00:00