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annotate Modules/_weakref.c @ 74006:88198b93ff2f

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Issue #13560: Add PyUnicode_EncodeLocale() * Use PyUnicode_EncodeLocale() in time.strftime() if wcsftime() is not available * Document my last changes in Misc/NEWS
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 17 Dec 2011 04:13:41 +0100
parents 94f64f11fdd0
children 8fde1a2c94dc
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 = PyLong_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));
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21 }
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22 else
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23 result = PyLong_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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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 static struct PyModuleDef weakrefmodule = {
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92 PyModuleDef_HEAD_INIT,
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93 "_weakref",
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94 "Weak-reference support module.",
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95 -1,
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96 weakref_functions,
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97 NULL,
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98 NULL,
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99 NULL,
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100 NULL
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101 };
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102
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103 PyMODINIT_FUNC
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104 PyInit__weakref(void)
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105 {
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106 PyObject *m;
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107
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108 m = PyModule_Create(&weakrefmodule);
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109
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110 if (m != NULL) {
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111 Py_INCREF(&_PyWeakref_RefType);
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112 PyModule_AddObject(m, "ref",
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113 (PyObject *) &_PyWeakref_RefType);
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114 Py_INCREF(&_PyWeakref_RefType);
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115 PyModule_AddObject(m, "ReferenceType",
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116 (PyObject *) &_PyWeakref_RefType);
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117 Py_INCREF(&_PyWeakref_ProxyType);
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118 PyModule_AddObject(m, "ProxyType",
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119 (PyObject *) &_PyWeakref_ProxyType);
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120 Py_INCREF(&_PyWeakref_CallableProxyType);
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121 PyModule_AddObject(m, "CallableProxyType",
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122 (PyObject *) &_PyWeakref_CallableProxyType);
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123 }
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124 return m;
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125 }