python-docs-ja/c-api/gcsupport.po at 3.14 · python/python-docs-ja

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# Copyright (C) 2001 Python Software Foundation
# This file is distributed under the same license as the Python package.
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# python-doc bot, 2026
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#: ../../c-api/gcsupport.rst:6
msgid "Supporting Cyclic Garbage Collection"
msgstr "循環参照ガベージコレクションをサポートする"
#: ../../c-api/gcsupport.rst:8
"Python's support for detecting and collecting garbage which involves "
"circular references requires support from object types which are "
"\"containers\" for other objects which may also be containers.  Types which "
"do not store references to other objects, or which only store references to "
"atomic types (such as numbers or strings), do not need to provide any "
"explicit support for garbage collection."
"Python が循環参照を含むガベージの検出とコレクションをサポートするには、他のオ"
"ブジェクトに対する \"コンテナ\" (他のオブジェクトには他のコンテナも含みます) "
"となるオブジェクト型によるサポートが必要です。他のオブジェクトに対する参照を"
"記憶しないオブジェクトや、(数値や文字列のような) アトム型 (atomic type) への"
"参照だけを記憶するような型では、ガベージコレクションに際して特別これといった"
"サポートを提供する必要はありません。"
#: ../../c-api/gcsupport.rst:15
"To create a container type, the :c:member:`~PyTypeObject.tp_flags` field of "
"the type object must include the :c:macro:`Py_TPFLAGS_HAVE_GC` and provide "
"an implementation of the :c:member:`~PyTypeObject.tp_traverse` handler.  If "
"instances of the type are mutable, a :c:member:`~PyTypeObject.tp_clear` "
"implementation must also be provided."
#: ../../c-api/gcsupport.rst:21
msgid ":c:macro:`Py_TPFLAGS_HAVE_GC`"
#: ../../c-api/gcsupport.rst:22
"Objects with a type with this flag set must conform with the rules "
"documented here.  For convenience these objects will be referred to as "
"container objects."
"このフラグをセットした型のオブジェクトは、この節に述べた規則に適合しなければ"
"なりません。簡単のため、このフラグをセットした型のオブジェクトをコンテナオブ"
"ジェクトと呼びます。"
#: ../../c-api/gcsupport.rst:26
msgid "Constructors for container types must conform to two rules:"
"コンテナ型のコンストラクタは以下の二つの規則に適合しなければなりません:"
#: ../../c-api/gcsupport.rst:28
"The memory for the object must be allocated using :c:macro:`PyObject_GC_New` "
"or :c:macro:`PyObject_GC_NewVar`."
#: ../../c-api/gcsupport.rst:31
"Once all the fields which may contain references to other containers are "
"initialized, it must call :c:func:`PyObject_GC_Track`."
"他のコンテナへの参照が入るかもしれないフィールドが全て初期化されたら、すぐ"
"に :c:func:`PyObject_GC_Track` を呼び出さなければなりません。"
#: ../../c-api/gcsupport.rst:34
"Similarly, the deallocator for the object must conform to a similar pair of "
"同様に、オブジェクトのメモリ解放関数も以下の二つの規則に適合しなければなりま"
#: ../../c-api/gcsupport.rst:37
"Before fields which refer to other containers are invalidated, :c:func:"
"`PyObject_GC_UnTrack` must be called."
"他のコンテナを参照しているフィールドを無効化する前に、 :c:func:"
"`PyObject_GC_UnTrack` を呼び出さなければなりません。"
#: ../../c-api/gcsupport.rst:40
"The object's memory must be deallocated using :c:func:`PyObject_GC_Del`."
"オブジェクトのメモリは :c:func:`PyObject_GC_Del` で解放しなければなりません。"
#: ../../c-api/gcsupport.rst:43
"If a type adds the Py_TPFLAGS_HAVE_GC, then it *must* implement at least a :"
"c:member:`~PyTypeObject.tp_traverse` handler or explicitly use one from its "
"subclass or subclasses."
#: ../../c-api/gcsupport.rst:47
"When calling :c:func:`PyType_Ready` or some of the APIs that indirectly call "
"it like :c:func:`PyType_FromSpecWithBases` or :c:func:`PyType_FromSpec` the "
"interpreter will automatically populate the :c:member:`~PyTypeObject."
"tp_flags`, :c:member:`~PyTypeObject.tp_traverse` and :c:member:"
"`~PyTypeObject.tp_clear` fields if the type inherits from a class that "
"implements the garbage collector protocol and the child class does *not* "
"include the :c:macro:`Py_TPFLAGS_HAVE_GC` flag."
#: ../../c-api/gcsupport.rst:57
"Analogous to :c:macro:`PyObject_New` but for container objects with the :c:"
"macro:`Py_TPFLAGS_HAVE_GC` flag set."
#: ../../c-api/gcsupport.rst:60 ../../c-api/gcsupport.rst:84
"Do not call this directly to allocate memory for an object; call the type's :"
"c:member:`~PyTypeObject.tp_alloc` slot instead."
#: ../../c-api/gcsupport.rst:63 ../../c-api/gcsupport.rst:87
"When populating a type's :c:member:`~PyTypeObject.tp_alloc` slot, :c:func:"
"`PyType_GenericAlloc` is preferred over a custom function that simply calls "
"this macro."
#: ../../c-api/gcsupport.rst:67 ../../c-api/gcsupport.rst:91
"Memory allocated by this macro must be freed with :c:func:`PyObject_GC_Del` "
"(usually called via the object's :c:member:`~PyTypeObject.tp_free` slot)."
#: ../../c-api/gcsupport.rst:73 ../../c-api/gcsupport.rst:97
msgid ":c:func:`PyObject_GC_Del`"
#: ../../c-api/gcsupport.rst:74
msgid ":c:macro:`PyObject_New`"
#: ../../c-api/gcsupport.rst:75 ../../c-api/gcsupport.rst:99
#: ../../c-api/gcsupport.rst:193
msgid ":c:func:`PyType_GenericAlloc`"
#: ../../c-api/gcsupport.rst:76 ../../c-api/gcsupport.rst:100
msgid ":c:member:`~PyTypeObject.tp_alloc`"
msgstr ":c:member:`~PyTypeObject.tp_alloc`"
#: ../../c-api/gcsupport.rst:81
"Analogous to :c:macro:`PyObject_NewVar` but for container objects with the :"
"c:macro:`Py_TPFLAGS_HAVE_GC` flag set."
#: ../../c-api/gcsupport.rst:98
msgid ":c:macro:`PyObject_NewVar`"
#: ../../c-api/gcsupport.rst:105
"Analogous to :c:macro:`PyObject_GC_New` but allocates *extra_size* bytes at "
"the end of the object (at offset :c:member:`~PyTypeObject.tp_basicsize`). "
"The allocated memory is initialized to zeros, except for the :c:type:`Python "
"object header <PyObject>`."
#: ../../c-api/gcsupport.rst:111
"The extra data will be deallocated with the object, but otherwise it is not "
"managed by Python."
#: ../../c-api/gcsupport.rst:114
"Memory allocated by this function must be freed with :c:func:"
"`PyObject_GC_Del` (usually called via the object's :c:member:`~PyTypeObject."
"tp_free` slot)."
#: ../../c-api/gcsupport.rst:119
"The function is marked as unstable because the final mechanism for reserving "
"extra data after an instance is not yet decided. For allocating a variable "
"number of fields, prefer using :c:type:`PyVarObject` and :c:member:"
"`~PyTypeObject.tp_itemsize` instead."
#: ../../c-api/gcsupport.rst:130
"Resize an object allocated by :c:macro:`PyObject_NewVar`. Returns the "
"resized object of type ``TYPE*`` (refers to any C type) or ``NULL`` on "
#: ../../c-api/gcsupport.rst:134
"*op* must be of type :c:expr:`PyVarObject *` and must not be tracked by the "
"collector yet. *newsize* must be of type :c:type:`Py_ssize_t`."
#: ../../c-api/gcsupport.rst:141
"Adds the object *op* to the set of container objects tracked by the "
"collector.  The collector can run at unexpected times so objects must be "
"valid while being tracked.  This should be called once all the fields "
"followed by the :c:member:`~PyTypeObject.tp_traverse` handler become valid, "
"usually near the end of the constructor."
"オブジェクト *op* を、コレクタによって追跡されるオブジェクトの集合に追加しま"
"す。コレクタは何回動くのかは予想できないので、追跡されている間はオブジェクト"
"は正しい状態でいなければなりません。 :c:member:`~PyTypeObject.tp_traverse` の"
"対象となる全てのフィールドが正しい状態になってすぐに、たいていはコンストラク"
"タの末尾付近で、呼び出すべきです。"
#: ../../c-api/gcsupport.rst:150
"Returns non-zero if the object implements the garbage collector protocol, "
"otherwise returns 0."
#: ../../c-api/gcsupport.rst:153
"The object cannot be tracked by the garbage collector if this function "
"returns 0."
#: ../../c-api/gcsupport.rst:158
"Returns 1 if the object type of *op* implements the GC protocol and *op* is "
"being currently tracked by the garbage collector and 0 otherwise."
#: ../../c-api/gcsupport.rst:161
msgid "This is analogous to the Python function :func:`gc.is_tracked`."
#: ../../c-api/gcsupport.rst:168
"Returns 1 if the object type of *op* implements the GC protocol and *op* has "
"been already finalized by the garbage collector and 0 otherwise."
#: ../../c-api/gcsupport.rst:171
msgid "This is analogous to the Python function :func:`gc.is_finalized`."
#: ../../c-api/gcsupport.rst:178
"Releases memory allocated to an object using :c:macro:`PyObject_GC_New` or :"
"c:macro:`PyObject_GC_NewVar`."
#: ../../c-api/gcsupport.rst:181
"Do not call this directly to free an object's memory; call the type's :c:"
"member:`~PyTypeObject.tp_free` slot instead."
#: ../../c-api/gcsupport.rst:184
"Do not use this for memory allocated by :c:macro:`PyObject_New`, :c:macro:"
"`PyObject_NewVar`, or related allocation functions; use :c:func:"
"`PyObject_Free` instead."
#: ../../c-api/gcsupport.rst:190
msgid ":c:func:`PyObject_Free` is the non-GC equivalent of this function."
#: ../../c-api/gcsupport.rst:191
msgid ":c:macro:`PyObject_GC_New`"
#: ../../c-api/gcsupport.rst:192
msgid ":c:macro:`PyObject_GC_NewVar`"
#: ../../c-api/gcsupport.rst:194
msgid ":c:member:`~PyTypeObject.tp_free`"
msgstr ":c:member:`~PyTypeObject.tp_free`"
#: ../../c-api/gcsupport.rst:199
"Remove the object *op* from the set of container objects tracked by the "
"collector.  Note that :c:func:`PyObject_GC_Track` can be called again on "
"this object to add it back to the set of tracked objects.  The deallocator (:"
"c:member:`~PyTypeObject.tp_dealloc` handler) should call this for the object "
"before any of the fields used by the :c:member:`~PyTypeObject.tp_traverse` "
"handler become invalid."
"オブジェクト *op* を、コレクタによって追跡されるオブジェクトの集合から除去し"
"ます。このオブジェクトに対して :c:func:`PyObject_GC_Track` を再度呼び出して、"
"追跡されるオブジェクトの集合に戻すことも可能です。 :c:member:`~PyTypeObject."
"tp_traverse` ハンドラの対象となるフィールドが正しくない状態になる前に、デアロ"
"ケータ (:c:member:`~PyTypeObject.tp_dealloc` ハンドラ) はオブジェクトに対し"
"て、この関数を呼び出すべきです。"
#: ../../c-api/gcsupport.rst:208
"The :c:func:`!_PyObject_GC_TRACK` and :c:func:`!_PyObject_GC_UNTRACK` macros "
"have been removed from the public C API."
#: ../../c-api/gcsupport.rst:211
"The :c:member:`~PyTypeObject.tp_traverse` handler accepts a function "
"parameter of this type:"
":c:member:`~PyTypeObject.tp_traverse` ハンドラはこの型の関数パラメータを受け"
#: ../../c-api/gcsupport.rst:216
"Type of the visitor function passed to the :c:member:`~PyTypeObject."
"tp_traverse` handler. The function should be called with an object to "
"traverse as *object* and the third parameter to the :c:member:`~PyTypeObject."
"tp_traverse` handler as *arg*.  The Python core uses several visitor "
"functions to implement cyclic garbage detection; it's not expected that "
"users will need to write their own visitor functions."
":c:member:`~PyTypeObject.tp_traverse` ハンドラに渡されるビジター関数 "
"(visitor function) の型です。この関数は、探索するオブジェクトを *object* とし"
"て、  :c:member:`~PyTypeObject.tp_traverse` ハンドラの第 3 引数を *arg* とし"
"て呼び出します。 Python のコアはいくつかのビジター関数を使って、ゴミとなった"
"循環参照を検出する仕組みを実装します; ユーザが自身のためにビジター関数を書く"
"必要が出てくることはないでしょう。"
#: ../../c-api/gcsupport.rst:223
"The :c:member:`~PyTypeObject.tp_clear` handler must be of the :c:type:"
"`inquiry` type, or ``NULL`` if the object is immutable."
":c:member:`~PyTypeObject.tp_clear` ハンドラは :c:type:`inquiry` 型であるか、"
"オブジェクトが不変 (immutable) な場合は ``NULL`` でなければなりません。"
#: ../../c-api/gcsupport.rst:229
"Drop references that may have created reference cycles.  Immutable objects "
"do not have to define this method since they can never directly create "
"reference cycles.  Note that the object must still be valid after calling "
"this method (don't just call :c:func:`Py_DECREF` on a reference).  The "
"collector will call this method if it detects that this object is involved "
"in a reference cycle."
"循環参照を形成しているとおぼしき参照群を放棄します。変更不可能なオブジェクト"
"は循環参照を直接形成することが決してないので、この関数を定義する必要はありま"
"せん。このメソッドを呼び出した後でもオブジェクトは有効なままでなければならな"
"いので注意してください (参照に対して :c:func:`Py_DECREF` を呼ぶだけにしないで"
"ください)。ガベージコレクタは、オブジェクトが循環参照を形成していることを検出"
"した際にこのメソッドを呼び出します。"
#: ../../c-api/gcsupport.rst:240
msgid "Traversal"
#: ../../c-api/gcsupport.rst:242
"The :c:member:`~PyTypeObject.tp_traverse` handler must have the following "
":c:member:`~PyTypeObject.tp_traverse` ハンドラは次の型を持っていなければなり"
#: ../../c-api/gcsupport.rst:246
"Traversal function for a garbage-collected object, used by the garbage "
"collector to detect reference cycles. Implementations must call the *visit* "
"function for each object directly contained by *self*, with the parameters "
"to *visit* being the contained object and the *arg* value passed to the "
"handler.  The *visit* function must not be called with a ``NULL`` object "
"argument.  If *visit* returns a non-zero value, that value should be "
"returned immediately."
#: ../../c-api/gcsupport.rst:255
"A typical :c:member:`!tp_traverse` function calls the :c:func:`Py_VISIT` "
"convenience macro on each of the instance's members that are Python objects "
"that the instance owns. For example, this is a (slightly outdated) traversal "
"function for the :py:class:`threading.local` class::"
#: ../../c-api/gcsupport.rst:261
"static int\n"
"local_traverse(PyObject *op, visitproc visit, void *arg)\n"
"    localobject *self = (localobject *) op;\n"
"    Py_VISIT(Py_TYPE(self));\n"
"    Py_VISIT(self->args);\n"
"    Py_VISIT(self->kw);\n"
"    Py_VISIT(self->dict);\n"
"    return 0;\n"
#: ../../c-api/gcsupport.rst:273
":c:func:`Py_VISIT` requires the *visit* and *arg* parameters to :c:func:`!"
"local_traverse` to have these specific names; don't name them just anything."
#: ../../c-api/gcsupport.rst:277
"Instances of :ref:`heap-allocated types <heap-types>` hold a reference to "
"their type. Their traversal function must therefore visit the type::"
#: ../../c-api/gcsupport.rst:280
msgid "Py_VISIT(Py_TYPE(self));"
#: ../../c-api/gcsupport.rst:282
"Alternately, the type may delegate this responsibility by calling "
"``tp_traverse`` of a heap-allocated superclass (or another heap-allocated "
"type, if applicable). If they do not, the type object may not be garbage-"
"collected."
#: ../../c-api/gcsupport.rst:287
"If the :c:macro:`Py_TPFLAGS_MANAGED_DICT` bit is set in the :c:member:"
"`~PyTypeObject.tp_flags` field, the traverse function must call :c:func:"
"`PyObject_VisitManagedDict` like this::"
#: ../../c-api/gcsupport.rst:291
"int err = PyObject_VisitManagedDict((PyObject*)self, visit, arg);\n"
"if (err) {\n"
"    return err;\n"
#: ../../c-api/gcsupport.rst:296
"Only the members that the instance *owns* (by having :term:`strong "
"references <strong reference>` to them) must be visited. For instance, if an "
"object supports weak references via the :c:member:`~PyTypeObject."
"tp_weaklist` slot, the pointer supporting the linked list (what "
"*tp_weaklist* points to) must **not** be visited as the instance does not "
"directly own the weak references to itself."
#: ../../c-api/gcsupport.rst:303
msgid "The traversal function has a limitation:"
#: ../../c-api/gcsupport.rst:307
"The traversal function must not have any side effects.  Implementations may "
"not modify the reference counts of any Python objects nor create or destroy "
"any Python objects, directly or indirectly."
#: ../../c-api/gcsupport.rst:311
"This means that *most* Python C API functions may not be used, since they "
"can raise a new exception, return a new reference to a result object, have "
"internal logic that uses side effects. Also, unless documented otherwise, "
"functions that happen to not have side effects may start having them in "
"future versions, without warning."
#: ../../c-api/gcsupport.rst:317
"For a list of safe functions, see a :ref:`separate section <duringgc-"
"functions>` below."
#: ../../c-api/gcsupport.rst:322
"The :c:func:`Py_VISIT` call may be skipped for those members that provably "
"cannot participate in reference cycles. In the ``local_traverse`` example "
"above, there is also a ``self->key`` member, but it can only be ``NULL`` or "
"a Python string and therefore cannot be part of a reference cycle."
#: ../../c-api/gcsupport.rst:328
"On the other hand, even if you know a member can never be part of a cycle, "
"as a debugging aid you may want to visit it anyway just so the :mod:`gc` "
"module's :func:`~gc.get_referents` function will include it."
"一方、メンバが循環参照の一部になり得ないと判っていても、デバッグ目的で巡回し"
"たい場合があるかもしれないので、 :mod:`gc` モジュールの :func:`~gc."
"get_referents` 関数は循環参照になり得ないメンバも返します。"
#: ../../c-api/gcsupport.rst:334
"The :c:member:`~PyTypeObject.tp_traverse` function can be called from any "
#: ../../c-api/gcsupport.rst:339
"Garbage collection is a \"stop-the-world\" operation: even in :term:`free "
"threading` builds, only one thread state is :term:`attached <attached thread "
"state>` when :c:member:`!tp_traverse` handlers run."
#: ../../c-api/gcsupport.rst:346
"Heap-allocated types are expected to visit ``Py_TYPE(self)`` in "
"``tp_traverse``.  In earlier versions of Python, due to `bug 40217 <https://"
"bugs.python.org/issue40217>`_, doing this may lead to crashes in subclasses."
#: ../../c-api/gcsupport.rst:351
"To simplify writing :c:member:`~PyTypeObject.tp_traverse` handlers, a :c:"
"func:`Py_VISIT` macro is provided. In order to use this macro, the :c:member:"
"`~PyTypeObject.tp_traverse` implementation must name its arguments exactly "
"*visit* and *arg*:"
#: ../../c-api/gcsupport.rst:358
"If the :c:expr:`PyObject *` *o* is not ``NULL``, call the *visit* callback, "
"with arguments *o* and *arg*. If *visit* returns a non-zero value, then "
"return it."
#: ../../c-api/gcsupport.rst:362
msgid "This corresponds roughly to::"
#: ../../c-api/gcsupport.rst:364
"#define Py_VISIT(o)                             \\\n"
"   if (op) {                                    \\\n"
"      int visit_result = visit(o, arg);         \\\n"
"      if (visit_result != 0) {                  \\\n"
"         return visit_result;                   \\\n"
#: ../../c-api/gcsupport.rst:374
msgid "Traversal-safe functions"
#: ../../c-api/gcsupport.rst:376
"The following functions and macros are safe to use in a :c:member:"
"`~PyTypeObject.tp_traverse` handler:"
#: ../../c-api/gcsupport.rst:379
msgid "the *visit* function passed to ``tp_traverse``"
#: ../../c-api/gcsupport.rst:380
msgid ":c:func:`Py_VISIT`"
#: ../../c-api/gcsupport.rst:381
msgid ":c:func:`Py_SIZE`"
#: ../../c-api/gcsupport.rst:382
":c:func:`Py_TYPE`: if called from a :c:member:`!tp_traverse` handler, :c:"
"func:`!Py_TYPE`'s result will be valid for the duration of the handler call"
#: ../../c-api/gcsupport.rst:384
msgid ":c:func:`PyObject_VisitManagedDict`"
#: ../../c-api/gcsupport.rst:385
":c:func:`PyObject_TypeCheck`, :c:func:`PyType_IsSubtype`, :c:func:"
"`PyType_HasFeature`"
#: ../../c-api/gcsupport.rst:387
":samp:`Py{<type>}_Check` and :samp:`Py{<type>}_CheckExact` -- for example, :"
"c:func:`PyTuple_Check`"
#: ../../c-api/gcsupport.rst:389
msgid ":ref:`duringgc-functions`"
#: ../../c-api/gcsupport.rst:394
msgid "\"DuringGC\" functions"
#: ../../c-api/gcsupport.rst:396
"The following functions should *only* be used in a :c:member:`~PyTypeObject."
"tp_traverse` handler; calling them in other contexts may have unintended "
"consequences."
#: ../../c-api/gcsupport.rst:400
"These functions act like their counterparts without the ``_DuringGC`` "
"suffix, but they are guaranteed to not have side effects, they do not set an "
"exception on failure, and they return/set :term:`borrowed references "
"<borrowed reference>` as detailed in the individual documentation."
#: ../../c-api/gcsupport.rst:405
"Note that these functions may fail (return ``NULL`` or ``-1``), but as they "
"do not set an exception, no error information is available. In some cases, "
"failure is not distinguishable from a successful ``NULL`` result."
#: ../../c-api/gcsupport.rst:415 ../../c-api/gcsupport.rst:430
#: ../../c-api/gcsupport.rst:443
msgid "See :ref:`duringgc-functions` for common information."
#: ../../c-api/gcsupport.rst:421
":c:func:`PyObject_GetTypeData`, :c:func:`PyObject_GetItemData`, :c:func:"
"`PyType_GetModuleState`, :c:func:`PyModule_GetState`, :c:func:"
"`PyModule_GetToken`, :c:func:`PyType_GetBaseByToken`"
#: ../../c-api/gcsupport.rst:432
"Sets *\\*result* to a :term:`borrowed reference` rather than a strong one. "
"The reference is valid for the duration of the :c:member:`!tp_traverse` "
"handler call."
#: ../../c-api/gcsupport.rst:438
msgid ":c:func:`PyType_GetBaseByToken`"
#: ../../c-api/gcsupport.rst:445
"These functions return a :term:`borrowed reference`, which is valid for the "
"duration of the :c:member:`!tp_traverse` handler call."
#: ../../c-api/gcsupport.rst:452
msgid ":c:func:`PyType_GetModule`, :c:func:`PyType_GetModuleByToken`"
#: ../../c-api/gcsupport.rst:457
msgid "Controlling the Garbage Collector State"
#: ../../c-api/gcsupport.rst:459
"The C-API provides the following functions for controlling garbage "
"collection runs."
#: ../../c-api/gcsupport.rst:464
"Perform a full garbage collection, if the garbage collector is enabled. "
"(Note that :func:`gc.collect` runs it unconditionally.)"
#: ../../c-api/gcsupport.rst:467
"Returns the number of collected + unreachable objects which cannot be "
"collected. If the garbage collector is disabled or already collecting, "
"returns ``0`` immediately. Errors during garbage collection are passed to :"
"data:`sys.unraisablehook`. This function does not raise exceptions."
#: ../../c-api/gcsupport.rst:477
"Enable the garbage collector: similar to :func:`gc.enable`. Returns the "
"previous state, 0 for disabled and 1 for enabled."
#: ../../c-api/gcsupport.rst:485
"Disable the garbage collector: similar to :func:`gc.disable`. Returns the "
"previous state, 0 for disabled and 1 for enabled."
#: ../../c-api/gcsupport.rst:493
"Query the state of the garbage collector: similar to :func:`gc.isenabled`. "
"Returns the current state, 0 for disabled and 1 for enabled."
#: ../../c-api/gcsupport.rst:500
msgid "Querying Garbage Collector State"
#: ../../c-api/gcsupport.rst:502
"The C-API provides the following interface for querying information about "
"the garbage collector."
#: ../../c-api/gcsupport.rst:507
"Run supplied *callback* on all live GC-capable objects. *arg* is passed "
"through to all invocations of *callback*."
#: ../../c-api/gcsupport.rst:511
"If new objects are (de)allocated by the callback it is undefined if they "
"will be visited."
#: ../../c-api/gcsupport.rst:514
"Garbage collection is disabled during operation. Explicitly running a "
"collection in the callback may lead to undefined behaviour e.g. visiting the "
"same objects multiple times or not at all."
#: ../../c-api/gcsupport.rst:522
"Type of the visitor function to be passed to :c:func:"
"`PyUnstable_GC_VisitObjects`. *arg* is the same as the *arg* passed to "
"``PyUnstable_GC_VisitObjects``. Return ``1`` to continue iteration, return "
"``0`` to stop iteration. Other return values are reserved for now so "
"behavior on returning anything else is undefined."
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