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Revision 6c4c45efaeb40f4f837570f57d90a0b3429c6ae9 authored by Benjamin Peterson on 06 November 2019, 03:21:29 UTC, committed by GitHub on 06 November 2019, 03:21:29 UTC
1 parent 56698d5
Tip revision: 6c4c45efaeb40f4f837570f57d90a0b3429c6ae9 authored by Benjamin Peterson on 06 November 2019, 03:21:29 UTC
bpo-38692: Add os.pidfd_open. (GH-17063)
bpo-38692: Add os.pidfd_open. (GH-17063)
Tip revision: 6c4c45e
allocation.rst
.. highlight:: c
.. _allocating-objects:
Allocating Objects on the Heap
==============================
.. c:function:: PyObject* _PyObject_New(PyTypeObject *type)
.. c:function:: PyVarObject* _PyObject_NewVar(PyTypeObject *type, Py_ssize_t size)
.. c:function:: PyObject* PyObject_Init(PyObject *op, PyTypeObject *type)
Initialize a newly-allocated object *op* with its type and initial
reference. Returns the initialized object. If *type* indicates that the
object participates in the cyclic garbage detector, it is added to the
detector's set of observed objects. Other fields of the object are not
affected.
.. c:function:: PyVarObject* PyObject_InitVar(PyVarObject *op, PyTypeObject *type, Py_ssize_t size)
This does everything :c:func:`PyObject_Init` does, and also initializes the
length information for a variable-size object.
.. c:function:: TYPE* PyObject_New(TYPE, PyTypeObject *type)
Allocate a new Python object using the C structure type *TYPE* and the
Python type object *type*. Fields not defined by the Python object header
are not initialized; the object's reference count will be one. The size of
the memory allocation is determined from the :c:member:`~PyTypeObject.tp_basicsize` field of
the type object.
.. c:function:: TYPE* PyObject_NewVar(TYPE, PyTypeObject *type, Py_ssize_t size)
Allocate a new Python object using the C structure type *TYPE* and the
Python type object *type*. Fields not defined by the Python object header
are not initialized. The allocated memory allows for the *TYPE* structure
plus *size* fields of the size given by the :c:member:`~PyTypeObject.tp_itemsize` field of
*type*. This is useful for implementing objects like tuples, which are
able to determine their size at construction time. Embedding the array of
fields into the same allocation decreases the number of allocations,
improving the memory management efficiency.
.. c:function:: void PyObject_Del(void *op)
Releases memory allocated to an object using :c:func:`PyObject_New` or
:c:func:`PyObject_NewVar`. This is normally called from the
:c:member:`~PyTypeObject.tp_dealloc` handler specified in the object's type. The fields of
the object should not be accessed after this call as the memory is no
longer a valid Python object.
.. c:var:: PyObject _Py_NoneStruct
Object which is visible in Python as ``None``. This should only be accessed
using the :c:macro:`Py_None` macro, which evaluates to a pointer to this
object.
.. seealso::
:c:func:`PyModule_Create`
To allocate and create extension modules.
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