_dbus_bindings/generic.c

   1 /* General Python glue code, used in _dbus_bindings but not actually anything
   2  * to do with D-Bus.
   3  *
   4  * Copyright (C) 2006 Collabora Ltd.
   5  *
   6  * Licensed under the Academic Free License version 2.1
   7  *
   8  * This library is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include "dbus_bindings-internal.h"
  25
  26 /* The empty tuple, held globally since dbus-python turns out to use it quite
  27  * a lot
  28  */
  29 PyObject *dbus_py_empty_tuple = NULL;
  30
  31 PyObject *
  32 dbus_py_tp_richcompare_by_pointer(PyObject *self,
  33                                   PyObject *other,
  34                                   int op)
  35 {
  36     if (op == Py_EQ || op == Py_NE) {
  37         if (self == other) {
  38             return PyInt_FromLong(op == Py_EQ);
  39         }
  40         return PyInt_FromLong(op == Py_NE);
  41     }
  42     PyErr_SetString(PyExc_TypeError,
  43                     "Instances of this type are not ordered");
  44     return NULL;
  45 }
  46
  47 long
  48 dbus_py_tp_hash_by_pointer(PyObject *self)
  49 {
  50     long hash = (long)self;
  51     return (hash == -1L ? -2L : hash);
  52 }
  53
  54 int
  55 dbus_py_immutable_setattro(PyObject *obj UNUSED,
  56                         PyObject *name UNUSED,
  57                         PyObject *value UNUSED)
  58 {
  59     PyErr_SetString(PyExc_AttributeError, "Object is immutable");
  60     return -1;
  61 }
  62
  63 /* Take the global interpreter lock and decrement the reference count.
  64  * Suitable for calling from a C callback. */
  65 void
  66 dbus_py_take_gil_and_xdecref(PyObject *obj)
  67 {
  68     PyGILState_STATE gil = PyGILState_Ensure();
  69     Py_XDECREF(obj);
  70     PyGILState_Release(gil);
  71 }
  72
  73 dbus_bool_t
  74 dbus_py_init_generic(void)
  75 {
  76     dbus_py_empty_tuple = PyTuple_New(0);
  77     if (!dbus_py_empty_tuple) return 0;
  78     return 1;
  79 }
  80
  81 /* vim:set ft=c cino< sw=4 sts=4 et: */