Mercurial > cpython-lru_cache-weakref

annotate Mac/Modules/autoGIL.c @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 6df0394abbf1
children fd25030223b0
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1 #include "Python.h"
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2 #include <CoreFoundation/CFRunLoop.h>
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3
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4 /* These macros are defined in Python 2.3 but not 2.2 */
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5 #ifndef PyMODINIT_FUNC
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6 #define PyMODINIT_FUNC void
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7 #endif
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8 #ifndef PyDoc_STRVAR
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9 #define PyDoc_STRVAR(Var,Str) static char Var[] = Str
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10 #endif
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11
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12
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13 #undef AUTOGIL_DEBUG
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14
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15 static PyObject *AutoGILError;
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16
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17
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18 static void autoGILCallback(CFRunLoopObserverRef observer,
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19 CFRunLoopActivity activity,
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20 void *info) {
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21 PyThreadState **p_tstate = (PyThreadState **)info;
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22
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23 switch (activity) {
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24 case kCFRunLoopBeforeWaiting:
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25 /* going to sleep, release GIL */
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26 #ifdef AUTOGIL_DEBUG
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27 fprintf(stderr, "going to sleep, release GIL\n");
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28 #endif
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29 *p_tstate = PyEval_SaveThread();
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30 break;
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31 case kCFRunLoopAfterWaiting:
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32 /* waking up, acquire GIL */
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33 #ifdef AUTOGIL_DEBUG
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34 fprintf(stderr, "waking up, acquire GIL\n");
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35 #endif
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36 PyEval_RestoreThread(*p_tstate);
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37 *p_tstate = NULL;
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38 break;
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39 default:
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40 break;
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41 }
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42 }
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43
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44 static void infoRelease(const void *info) {
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45 /* XXX This should get called when the run loop is deallocated,
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46 but this doesn't seem to happen. So for now: leak. */
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47 PyMem_Free((void *)info);
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48 }
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49
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50 static PyObject *
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51 autoGIL_installAutoGIL(PyObject *self)
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52 {
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53 PyObject *tstate_dict = PyThreadState_GetDict();
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54 PyObject *v;
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55 CFRunLoopRef rl;
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56 PyThreadState **p_tstate; /* for use in the info field */
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57 CFRunLoopObserverContext context = {0, NULL, NULL, NULL, NULL};
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58 CFRunLoopObserverRef observer;
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59
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60 if (tstate_dict == NULL)
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61 return NULL;
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62 v = PyDict_GetItemString(tstate_dict, "autoGIL.InstalledAutoGIL");
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63 if (v != NULL) {
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64 /* we've already installed a callback for this thread */
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65 Py_INCREF(Py_None);
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66 return Py_None;
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67 }
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68
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69 rl = CFRunLoopGetCurrent();
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70 if (rl == NULL) {
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71 PyErr_SetString(AutoGILError,
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72 "can't get run loop for current thread");
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73 return NULL;
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74 }
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75
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76 p_tstate = PyMem_Malloc(sizeof(PyThreadState *));
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77 if (p_tstate == NULL) {
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78 PyErr_SetString(PyExc_MemoryError,
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79 "not enough memory to allocate "
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80 "tstate pointer");
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81 return NULL;
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82 }
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83 *p_tstate = NULL;
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84 context.info = (void *)p_tstate;
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85 context.release = infoRelease;
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86
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87 observer = CFRunLoopObserverCreate(
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88 NULL,
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89 kCFRunLoopBeforeWaiting | kCFRunLoopAfterWaiting,
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90 1, 0, autoGILCallback, &context);
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91 if (observer == NULL) {
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92 PyErr_SetString(AutoGILError,
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93 "can't create event loop observer");
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94 return NULL;
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95 }
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96 CFRunLoopAddObserver(rl, observer, kCFRunLoopDefaultMode);
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97 /* XXX how to check for errors? */
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98
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99 /* register that we have installed a callback for this thread */
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100 if (PyDict_SetItemString(tstate_dict, "autoGIL.InstalledAutoGIL",
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101 Py_None) < 0)
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102 return NULL;
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103
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104 Py_INCREF(Py_None);
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105 return Py_None;
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106 }
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107
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108 PyDoc_STRVAR(autoGIL_installAutoGIL_doc,
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109 "installAutoGIL() -> None\n\
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110 Install an observer callback in the event loop (CFRunLoop) for the\n\
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111 current thread, that will lock and unlock the Global Interpreter Lock\n\
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112 (GIL) at appropriate times, allowing other Python threads to run while\n\
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113 the event loop is idle."
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114 );
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115
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116 static PyMethodDef autoGIL_methods[] = {
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117 {
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118 "installAutoGIL",
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119 (PyCFunction)autoGIL_installAutoGIL,
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120 METH_NOARGS,
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121 autoGIL_installAutoGIL_doc
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122 },
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123 { 0, 0, 0, 0 } /* sentinel */
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124 };
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125
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126 PyDoc_STRVAR(autoGIL_docs,
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127 "The autoGIL module provides a function (installAutoGIL) that\n\
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128 automatically locks and unlocks Python's Global Interpreter Lock\n\
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129 when running an event loop."
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130 );
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131
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132 PyMODINIT_FUNC
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133 initautoGIL(void)
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134 {
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135 PyObject *mod;
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136
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137 if (PyErr_WarnPy3k("In 3.x, the autoGIL module is removed.", 1) < 0)
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138 return;
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139
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140 mod = Py_InitModule4("autoGIL", autoGIL_methods, autoGIL_docs,
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141 NULL, PYTHON_API_VERSION);
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142 if (mod == NULL)
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143 return;
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144 AutoGILError = PyErr_NewException("autoGIL.AutoGILError",
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145 PyExc_Exception, NULL);
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146 if (AutoGILError == NULL)
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147 return;
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148 Py_INCREF(AutoGILError);
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149 if (PyModule_AddObject(mod, "AutoGILError",
4756fa538560 Short and sweet module doing something very useful: for event loop
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parents:
diff changeset
150 AutoGILError) < 0)
4756fa538560 Short and sweet module doing something very useful: for event loop
Just van Rossum <just@letterror.com>
parents:
diff changeset
151 return;
4756fa538560 Short and sweet module doing something very useful: for event loop
Just van Rossum <just@letterror.com>
parents:
diff changeset
152 }