python/src/object/life_support.cpp at python313 · boostorg/python · GitHub

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// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/python/object/life_support.hpp>

#include <boost/python/detail/none.hpp>

#include <boost/python/refcount.hpp>

namespace boost { namespace python { namespace objects {

struct life_support

{

PyObject_HEAD

PyObject* patient;

};

extern "C"

{

static void

life_support_dealloc(PyObject* self)

{

Py_XDECREF(((life_support*)self)->patient);

self->ob_type->tp_free(self);

}

static PyObject *

life_support_call(PyObject *self, PyObject *arg, PyObject * /*kw*/)

{

// Let the patient die now

Py_XDECREF(((life_support*)self)->patient);

((life_support*)self)->patient = 0;

// Let the weak reference die. This probably kills us.

Py_XDECREF(PyTuple_GET_ITEM(arg, 0));

return ::boost::python::detail::none();

}

PyTypeObject life_support_type = {

PyVarObject_HEAD_INIT(NULL, 0)//(&PyType_Type)

const_cast<char*>("Boost.Python.life_support"),

sizeof(life_support),

life_support_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_compare */

0, //(reprfunc)func_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

life_support_call, /* tp_call */

0, /* tp_str */

0, // PyObject_GenericGetAttr, /* tp_getattro */

0, // PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT /* | Py_TPFLAGS_HAVE_GC */,/* tp_flags */

0, /* tp_doc */

0, // (traverseproc)func_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, //offsetof(PyLife_SupportObject, func_weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

0, // func_memberlist, /* tp_members */

0, //func_getsetlist, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, //offsetof(PyLife_SupportObject, func_dict), /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

0, /* tp_new */

0, /* tp_free */

0, /* tp_is_gc */

0, /* tp_bases */

0, /* tp_mro */

0, /* tp_cache */

0, /* tp_subclasses */

0, /* tp_weaklist */

#if PYTHON_API_VERSION >= 1012

0 /* tp_del */

#endif

};

PyObject* make_nurse_and_patient(PyObject* nurse, PyObject* patient)

{

if (nurse == Py_None || nurse == patient)

return nurse;

if (Py_TYPE(&life_support_type) == 0)

{

Py_SET_TYPE(&life_support_type, &PyType_Type);

PyType_Ready(&life_support_type);

}

life_support* system = PyObject_New(life_support, &life_support_type);

if (!system)

return 0;

system->patient = 0;

// We're going to leak this reference, but don't worry; the

// life_support system decrements it when the nurse dies.

PyObject* weakref = PyWeakref_NewRef(nurse, (PyObject*)system);

// weakref has either taken ownership, or we have to release it

// anyway

Py_DECREF(system);

if (!weakref)

return 0;

system->patient = patient;

Py_XINCREF(patient); // hang on to the patient until death

return weakref;

}

}}} // namespace boost::python::objects

python/src/object/life_support.cpp at python313 · boostorg/python · GitHub

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