Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 5438:e926c331ebbf legacy-trunk

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Instead of importing graminit.h whenever one of the three grammar 'root' symbols is needed, define these in Python.h with a Py_ prefix.
author Guido van Rossum <guido@python.org>
date Wed, 07 May 1997 17:46:13 +0000
parents b7871ca930ad
children 932cfc5fc104
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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(PyInterpreterState *interp)
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56 {
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57 Py_XDECREF(interp->import_modules);
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58 Py_XDECREF(interp->sysdict);
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59
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60 PyMem_DEL(interp);
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61 }
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62
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63
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64 PyThreadState *
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65 PyThreadState_New(PyInterpreterState *interp)
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66 {
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67 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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68 /* fprintf(stderr, "new tstate -> %p\n", tstate); */
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69 if (tstate != NULL) {
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70 tstate->interpreter_state = interp;
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71
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72 tstate->frame = NULL;
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73 tstate->recursion_depth = 0;
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74 tstate->ticker = 0;
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75 tstate->tracing = 0;
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76
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77 tstate->curexc_type = NULL;
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78 tstate->curexc_value = NULL;
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79 tstate->curexc_traceback = NULL;
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80
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81 tstate->exc_type = NULL;
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82 tstate->exc_value = NULL;
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83 tstate->exc_traceback = NULL;
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84
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85 tstate->sys_profilefunc = NULL;
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86 tstate->sys_tracefunc = NULL;
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87 tstate->sys_checkinterval = 0;
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88
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89 interp->nthreads++;
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90 }
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91 return tstate;
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92 }
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93
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94
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95 void
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96 PyThreadState_Delete(PyThreadState *tstate)
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97 {
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98 /* fprintf(stderr, "delete tstate %p\n", tstate); */
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99 if (tstate == current_tstate)
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100 current_tstate = NULL;
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101 tstate->interpreter_state->nthreads--;
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102
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103 Py_XDECREF((PyObject *) (tstate->frame)); /* XXX really? */
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104
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105 Py_XDECREF(tstate->curexc_type);
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106 Py_XDECREF(tstate->curexc_value);
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107 Py_XDECREF(tstate->curexc_traceback);
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108
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109 Py_XDECREF(tstate->exc_type);
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110 Py_XDECREF(tstate->exc_value);
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111 Py_XDECREF(tstate->exc_traceback);
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112
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113 Py_XDECREF(tstate->sys_profilefunc);
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114 Py_XDECREF(tstate->sys_tracefunc);
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115
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116 PyMem_DEL(tstate);
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117 }
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118
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119
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120 PyThreadState *
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121 PyThreadState_Get()
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122 {
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123 /* fprintf(stderr, "get tstate -> %p\n", current_tstate); */
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124 return current_tstate;
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125 }
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126
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127
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128 PyThreadState *
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129 PyThreadState_Swap(PyThreadState *new)
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130 {
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131 PyThreadState *old = current_tstate;
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132 /* fprintf(stderr, "swap tstate new=%p <--> old=%p\n", new, old); */
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133 current_tstate = new;
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134 return old;
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135 }
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136
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137
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138 /* How should one use this code?
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139
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140 1. Standard Python interpreter, assuming no other interpreters or threads:
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141
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142 PyInterpreterState *interp;
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143 PyThreadState *tstate;
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144 interp = PyInterpreterState_New();
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145 if (interp == NULL)
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146 Py_FatalError("...");
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147 tstate = PyThreadState_New(interp);
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148 if (tstate == NULL)
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149 Py_FatalError("...");
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150 (void) PyThreadState_Swap(tstate);
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151 PyInitialize();
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152 .
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153 . (use the interpreter here)
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154 .
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155 Py_Cleanup();
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156 PyThreadState_Delete(tstate);
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157 PyInterpreterState_Delete(interp);
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158
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159 2. Totally indepent interpreter invocation in a separate C thread:
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160
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161 XXX Need to interact with the thread lock nevertheless!!!
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162
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163 */