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annotate Python/pystate.c @ 5758:bfe9ba74c19e legacy-trunk

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Fix problem discovered by Greg McFarlane: when an imported module replaces its own entry in sys.module, reference count errors ensue; even if there is no reference count problem, it would be preferable for the import to yield the new thing in sys.modules anyway (if only because that's what later imports will yield). This opens the road to an official hack to implement a __getattr__ like feature for modules: stick an instance in sys.modules[__name__].
author Guido van Rossum <guido@python.org>
date Thu, 10 Jul 1997 18:00:45 +0000
parents 932cfc5fc104
children 0d7851b37ad2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Thread and interpreter state structures and their interfaces */
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33
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34 #include "Python.h"
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35
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36
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37 static PyThreadState *current_tstate = NULL;
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38
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39
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40 PyInterpreterState *
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41 PyInterpreterState_New()
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42 {
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43 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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44 if (interp != NULL) {
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45 interp->import_modules = NULL;
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46 interp->sysdict = NULL;
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47 interp->nthreads = 0;
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48 interp->nexitfuncs = 0;
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49 }
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50 return interp;
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51 }
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52
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53
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54 void
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55 PyInterpreterState_Delete(interp)
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56 PyInterpreterState *interp;
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57 {
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58 Py_XDECREF(interp->import_modules);
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59 Py_XDECREF(interp->sysdict);
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60
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61 PyMem_DEL(interp);
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62 }
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63
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64
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65 PyThreadState *
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66 PyThreadState_New(interp)
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67 PyInterpreterState *interp;
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68 {
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69 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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70 /* fprintf(stderr, "new tstate -> %p\n", tstate); */
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71 if (tstate != NULL) {
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72 tstate->interpreter_state = interp;
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73
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74 tstate->frame = NULL;
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75 tstate->recursion_depth = 0;
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76 tstate->ticker = 0;
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77 tstate->tracing = 0;
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78
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79 tstate->curexc_type = NULL;
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80 tstate->curexc_value = NULL;
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81 tstate->curexc_traceback = NULL;
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82
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83 tstate->exc_type = NULL;
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84 tstate->exc_value = NULL;
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85 tstate->exc_traceback = NULL;
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86
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87 tstate->sys_profilefunc = NULL;
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88 tstate->sys_tracefunc = NULL;
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89 tstate->sys_checkinterval = 0;
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90
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91 interp->nthreads++;
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92 }
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93 return tstate;
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94 }
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95
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96
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97 void
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98 PyThreadState_Delete(tstate)
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99 PyThreadState *tstate;
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100 {
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101 /* fprintf(stderr, "delete tstate %p\n", tstate); */
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102 if (tstate == current_tstate)
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103 current_tstate = NULL;
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104 tstate->interpreter_state->nthreads--;
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105
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106 Py_XDECREF((PyObject *) (tstate->frame)); /* XXX really? */
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107
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108 Py_XDECREF(tstate->curexc_type);
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109 Py_XDECREF(tstate->curexc_value);
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110 Py_XDECREF(tstate->curexc_traceback);
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111
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112 Py_XDECREF(tstate->exc_type);
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113 Py_XDECREF(tstate->exc_value);
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114 Py_XDECREF(tstate->exc_traceback);
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115
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116 Py_XDECREF(tstate->sys_profilefunc);
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117 Py_XDECREF(tstate->sys_tracefunc);
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118
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119 PyMem_DEL(tstate);
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120 }
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121
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122
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123 PyThreadState *
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124 PyThreadState_Get()
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125 {
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126 /* fprintf(stderr, "get tstate -> %p\n", current_tstate); */
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127 return current_tstate;
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128 }
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129
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130
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131 PyThreadState *
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132 PyThreadState_Swap(new)
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133 PyThreadState *new;
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134 {
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135 PyThreadState *old = current_tstate;
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136 /* fprintf(stderr, "swap tstate new=%p <--> old=%p\n", new, old); */
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137 current_tstate = new;
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138 return old;
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139 }
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140
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141
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142 /* How should one use this code?
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143
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144 1. Standard Python interpreter, assuming no other interpreters or threads:
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145
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146 PyInterpreterState *interp;
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147 PyThreadState *tstate;
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148 interp = PyInterpreterState_New();
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149 if (interp == NULL)
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150 Py_FatalError("...");
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151 tstate = PyThreadState_New(interp);
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152 if (tstate == NULL)
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153 Py_FatalError("...");
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154 (void) PyThreadState_Swap(tstate);
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155 PyInitialize();
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156 .
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157 . (use the interpreter here)
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158 .
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159 Py_Cleanup();
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160 PyThreadState_Delete(tstate);
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161 PyInterpreterState_Delete(interp);
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162
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163 2. Totally indepent interpreter invocation in a separate C thread:
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164
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165 XXX Need to interact with the thread lock nevertheless!!!
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166
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167 */