Mercurial > cpython-lru_cache-weakref

annotate Modules/_weakref.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 26384b8180c7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2
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3
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4 #define GET_WEAKREFS_LISTPTR(o) \
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5 ((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
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6
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7
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8 PyDoc_STRVAR(weakref_getweakrefcount__doc__,
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9 "getweakrefcount(object) -- return the number of weak references\n"
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10 "to 'object'.");
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11
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12 static PyObject *
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13 weakref_getweakrefcount(PyObject *self, PyObject *object)
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14 {
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15 PyObject *result = NULL;
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16
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17 if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) {
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18 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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19
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20 result = PyInt_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));
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21 }
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22 else
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23 result = PyInt_FromLong(0);
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24
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25 return result;
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26 }
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27
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28
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29 PyDoc_STRVAR(weakref_getweakrefs__doc__,
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30 "getweakrefs(object) -- return a list of all weak reference objects\n"
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31 "that point to 'object'.");
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32
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33 static PyObject *
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34 weakref_getweakrefs(PyObject *self, PyObject *object)
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35 {
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36 PyObject *result = NULL;
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37
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38 if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) {
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39 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
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40 Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
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41
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42 result = PyList_New(count);
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43 if (result != NULL) {
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44 PyWeakReference *current = *list;
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45 Py_ssize_t i;
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46 for (i = 0; i < count; ++i) {
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47 PyList_SET_ITEM(result, i, (PyObject *) current);
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48 Py_INCREF(current);
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49 current = current->wr_next;
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50 }
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51 }
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52 }
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53 else {
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54 result = PyList_New(0);
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55 }
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56 return result;
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57 }
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58
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59
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60 PyDoc_STRVAR(weakref_proxy__doc__,
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61 "proxy(object[, callback]) -- create a proxy object that weakly\n"
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62 "references 'object'. 'callback', if given, is called with a\n"
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63 "reference to the proxy when 'object' is about to be finalized.");
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64
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65 static PyObject *
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66 weakref_proxy(PyObject *self, PyObject *args)
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67 {
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68 PyObject *object;
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69 PyObject *callback = NULL;
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70 PyObject *result = NULL;
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71
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72 if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {
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73 result = PyWeakref_NewProxy(object, callback);
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74 }
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75 return result;
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76 }
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77
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78
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79 static PyMethodDef
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80 weakref_functions[] = {
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81 {"getweakrefcount", weakref_getweakrefcount, METH_O,
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82 weakref_getweakrefcount__doc__},
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83 {"getweakrefs", weakref_getweakrefs, METH_O,
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84 weakref_getweakrefs__doc__},
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85 {"proxy", weakref_proxy, METH_VARARGS,
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86 weakref_proxy__doc__},
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87 {NULL, NULL, 0, NULL}
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88 };
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89
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90
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91 PyMODINIT_FUNC
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92 init_weakref(void)
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93 {
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94 PyObject *m;
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95
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96 m = Py_InitModule3("_weakref", weakref_functions,
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97 "Weak-reference support module.");
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98 if (m != NULL) {
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99 Py_INCREF(&_PyWeakref_RefType);
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100 PyModule_AddObject(m, "ref",
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101 (PyObject *) &_PyWeakref_RefType);
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102 Py_INCREF(&_PyWeakref_RefType);
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103 PyModule_AddObject(m, "ReferenceType",
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104 (PyObject *) &_PyWeakref_RefType);
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105 Py_INCREF(&_PyWeakref_ProxyType);
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106 PyModule_AddObject(m, "ProxyType",
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107 (PyObject *) &_PyWeakref_ProxyType);
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108 Py_INCREF(&_PyWeakref_CallableProxyType);
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109 PyModule_AddObject(m, "CallableProxyType",
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110 (PyObject *) &_PyWeakref_CallableProxyType);
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111 }
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112 }