Mercurial > cpython-lru_cache-weakref
annotate Modules/_weakref.c @ 87488:124e51c19e4f
Issue #19734: Also run pip version check in isolated mode
| author | Nick Coghlan <ncoghlan@gmail.com> |
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| date | Sun, 24 Nov 2013 16:49:20 +1000 |
| parents | 78ec18f5cb45 |
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| rev | line source |
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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 /*[clinic] |
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8 module _weakref |
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9 [clinic]*/ |
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10 /*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/ |
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11 |
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12 /*[clinic] |
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13 |
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14 _weakref.getweakrefcount -> Py_ssize_t |
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15 |
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16 object: object |
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17 / |
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18 |
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19 Return the number of weak references to 'object'. |
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20 [clinic]*/ |
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21 |
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22 PyDoc_STRVAR(_weakref_getweakrefcount__doc__, |
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23 "getweakrefcount(object)\n" |
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24 "Return the number of weak references to \'object\'."); |
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25 |
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26 #define _WEAKREF_GETWEAKREFCOUNT_METHODDEF \ |
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27 {"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__}, |
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28 |
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29 static Py_ssize_t |
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30 _weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object); |
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31 |
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32 static PyObject * |
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33 _weakref_getweakrefcount(PyModuleDef *module, PyObject *object) |
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34 { |
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35 PyObject *return_value = NULL; |
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36 Py_ssize_t _return_value; |
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37 _return_value = _weakref_getweakrefcount_impl(module, object); |
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38 if ((_return_value == -1) && PyErr_Occurred()) |
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39 goto exit; |
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40 return_value = PyLong_FromSsize_t(_return_value); |
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41 |
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42 exit: |
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43 return return_value; |
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44 } |
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45 |
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46 static Py_ssize_t |
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47 _weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object) |
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48 /*[clinic checksum: 436e8fbe0297434375f039d8c2d9fc3a9bbe773c]*/ |
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49 { |
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50 PyWeakReference **list; |
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51 |
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52 if (!PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) |
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53 return 0; |
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54 |
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55 list = GET_WEAKREFS_LISTPTR(object); |
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56 return _PyWeakref_GetWeakrefCount(*list); |
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57 } |
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58 |
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59 |
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60 PyDoc_STRVAR(weakref_getweakrefs__doc__, |
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61 "getweakrefs(object) -- return a list of all weak reference objects\n" |
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62 "that point to 'object'."); |
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63 |
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64 static PyObject * |
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65 weakref_getweakrefs(PyObject *self, PyObject *object) |
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66 { |
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67 PyObject *result = NULL; |
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68 |
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69 if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) { |
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70 PyWeakReference **list = GET_WEAKREFS_LISTPTR(object); |
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71 Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list); |
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72 |
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73 result = PyList_New(count); |
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74 if (result != NULL) { |
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75 PyWeakReference *current = *list; |
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76 Py_ssize_t i; |
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77 for (i = 0; i < count; ++i) { |
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78 PyList_SET_ITEM(result, i, (PyObject *) current); |
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79 Py_INCREF(current); |
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80 current = current->wr_next; |
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81 } |
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82 } |
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83 } |
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84 else { |
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85 result = PyList_New(0); |
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86 } |
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87 return result; |
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88 } |
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89 |
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90 |
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91 PyDoc_STRVAR(weakref_proxy__doc__, |
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92 "proxy(object[, callback]) -- create a proxy object that weakly\n" |
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93 "references 'object'. 'callback', if given, is called with a\n" |
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94 "reference to the proxy when 'object' is about to be finalized."); |
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95 |
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96 static PyObject * |
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97 weakref_proxy(PyObject *self, PyObject *args) |
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98 { |
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99 PyObject *object; |
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100 PyObject *callback = NULL; |
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101 PyObject *result = NULL; |
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102 |
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103 if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) { |
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104 result = PyWeakref_NewProxy(object, callback); |
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105 } |
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106 return result; |
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107 } |
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108 |
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109 |
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110 static PyMethodDef |
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111 weakref_functions[] = { |
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112 _WEAKREF_GETWEAKREFCOUNT_METHODDEF |
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113 {"getweakrefs", weakref_getweakrefs, METH_O, |
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114 weakref_getweakrefs__doc__}, |
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115 {"proxy", weakref_proxy, METH_VARARGS, |
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116 weakref_proxy__doc__}, |
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117 {NULL, NULL, 0, NULL} |
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118 }; |
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119 |
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120 |
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121 static struct PyModuleDef weakrefmodule = { |
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122 PyModuleDef_HEAD_INIT, |
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123 "_weakref", |
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124 "Weak-reference support module.", |
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125 -1, |
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126 weakref_functions, |
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127 NULL, |
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128 NULL, |
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129 NULL, |
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130 NULL |
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131 }; |
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132 |
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133 PyMODINIT_FUNC |
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134 PyInit__weakref(void) |
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135 { |
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136 PyObject *m; |
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137 |
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138 m = PyModule_Create(&weakrefmodule); |
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139 |
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140 if (m != NULL) { |
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141 Py_INCREF(&_PyWeakref_RefType); |
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142 PyModule_AddObject(m, "ref", |
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143 (PyObject *) &_PyWeakref_RefType); |
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144 Py_INCREF(&_PyWeakref_RefType); |
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145 PyModule_AddObject(m, "ReferenceType", |
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146 (PyObject *) &_PyWeakref_RefType); |
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147 Py_INCREF(&_PyWeakref_ProxyType); |
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148 PyModule_AddObject(m, "ProxyType", |
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149 (PyObject *) &_PyWeakref_ProxyType); |
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150 Py_INCREF(&_PyWeakref_CallableProxyType); |
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151 PyModule_AddObject(m, "CallableProxyType", |
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152 (PyObject *) &_PyWeakref_CallableProxyType); |
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153 } |
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154 return m; |
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155 } |
