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The CALL family of instructions were mostly thread-safe already and only required a small number of changes, which are documented below.
A few changes were needed to make CALL_ALLOC_AND_ENTER_INIT thread-safe:
Added _PyType_LookupRefAndVersion, which returns the type version corresponding to the returned ref.
Added _PyType_CacheInitForSpecialization, which takes an init method and the corresponding type version and only populates the specialization cache if the current type version matches the supplied version. This prevents potentially caching a stale value in free-threaded builds if we race with an update to __init__.
Only cache __init__ functions that are deferred in free-threaded builds. This ensures that the reference to __init__ that is stored in the specialization cache is valid if the type version guard in _CHECK_AND_ALLOCATE_OBJECT passes.
Fix a bug in _CREATE_INIT_FRAME where the frame is pushed to the stack on failure.
A few other miscellaneous changes were also needed:
Use {LOCK,UNLOCK}_OBJECT in LIST_APPEND. This ensures that the list's per-object lock is held while we are appending to it.
Add missing co_tlbc for _Py_InitCleanup.
Stop/start the world around setting the eval frame hook. This allows us to read interp->eval_frame non-atomically and preserves the behavior of _CHECK_PEP_523 documented below.
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| .. | ||
| cpython | ||
| internal | ||
| abstract.h | ||
| audit.h | ||
| bltinmodule.h | ||
| boolobject.h | ||
| bytearrayobject.h | ||
| bytesobject.h | ||
| ceval.h | ||
| codecs.h | ||
| compile.h | ||
| complexobject.h | ||
| critical_section.h | ||
| datetime.h | ||
| descrobject.h | ||
| dictobject.h | ||
| dynamic_annotations.h | ||
| enumobject.h | ||
| errcode.h | ||
| exports.h | ||
| fileobject.h | ||
| fileutils.h | ||
| floatobject.h | ||
| frameobject.h | ||
| genericaliasobject.h | ||
| import.h | ||
| intrcheck.h | ||
| iterobject.h | ||
| listobject.h | ||
| lock.h | ||
| longobject.h | ||
| marshal.h | ||
| memoryobject.h | ||
| methodobject.h | ||
| modsupport.h | ||
| moduleobject.h | ||
| monitoring.h | ||
| object.h | ||
| objimpl.h | ||
| opcode.h | ||
| opcode_ids.h | ||
| osdefs.h | ||
| osmodule.h | ||
| patchlevel.h | ||
| py_curses.h | ||
| pyatomic.h | ||
| pybuffer.h | ||
| pycapsule.h | ||
| pydtrace.d | ||
| pydtrace.h | ||
| pyerrors.h | ||
| pyexpat.h | ||
| pyframe.h | ||
| pyhash.h | ||
| pylifecycle.h | ||
| pymacconfig.h | ||
| pymacro.h | ||
| pymath.h | ||
| pymem.h | ||
| pyport.h | ||
| pystate.h | ||
| pystats.h | ||
| pystrcmp.h | ||
| pystrtod.h | ||
| Python.h | ||
| pythonrun.h | ||
| pythread.h | ||
| pytypedefs.h | ||
| rangeobject.h | ||
| README.rst | ||
| refcount.h | ||
| setobject.h | ||
| sliceobject.h | ||
| structmember.h | ||
| structseq.h | ||
| sysmodule.h | ||
| traceback.h | ||
| tupleobject.h | ||
| typeslots.h | ||
| unicodeobject.h | ||
| warnings.h | ||
| weakrefobject.h | ||
The Python C API ================ The C API is divided into these sections: 1. ``Include/``: Limited API 2. ``Include/cpython/``: CPython implementation details 3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can change between minor releases 4. ``Include/internal/``, and any name with ``_`` prefix: The internal API Information on changing the C API is available `in the developer guide`_ .. _in the developer guide: https://devguide.python.org/c-api/