Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 10072:ecebcd84df37 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
put the preferences file in a folder called "Python" inside the prefs folder, just like the IDE does -- jvr
author Just van Rossum <just@lettererror.com>
date Tue, 02 Feb 1999 15:49:03 +0000
parents 914f83e7fa0a
children 3b3c7b8ade7f
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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 #define ZAP(x) { \
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37 PyObject *tmp = (PyObject *)(x); \
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38 (x) = NULL; \
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39 Py_XDECREF(tmp); \
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40 }
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41
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42
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43 static PyInterpreterState *interp_head = NULL;
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44
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45 PyThreadState *_PyThreadState_Current = NULL;
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46
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47
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48 PyInterpreterState *
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49 PyInterpreterState_New()
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50 {
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51 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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52
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53 if (interp != NULL) {
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54 interp->modules = NULL;
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55 interp->sysdict = NULL;
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56 interp->builtins = NULL;
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57 interp->checkinterval = 10;
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58 interp->tstate_head = NULL;
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59
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60 interp->next = interp_head;
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61 interp_head = interp;
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62 }
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63
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64 return interp;
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65 }
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66
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67
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68 void
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69 PyInterpreterState_Clear(interp)
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70 PyInterpreterState *interp;
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71 {
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72 PyThreadState *p;
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73 for (p = interp->tstate_head; p != NULL; p = p->next)
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74 PyThreadState_Clear(p);
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75 ZAP(interp->modules);
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76 ZAP(interp->sysdict);
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77 ZAP(interp->builtins);
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78 }
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79
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80
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81 static void
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82 zapthreads(interp)
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83 PyInterpreterState *interp;
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84 {
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85 PyThreadState *p, *q;
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86 p = interp->tstate_head;
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87 while (p != NULL) {
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88 q = p->next;
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89 PyThreadState_Delete(p);
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90 p = q;
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91 }
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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 PyInterpreterState_Delete(interp)
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97 PyInterpreterState *interp;
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98 {
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99 PyInterpreterState **p;
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100 zapthreads(interp);
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101 for (p = &interp_head; ; p = &(*p)->next) {
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102 if (*p == NULL)
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103 Py_FatalError(
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104 "PyInterpreterState_Delete: invalid interp");
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105 if (*p == interp)
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106 break;
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107 }
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108 if (interp->tstate_head != NULL)
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109 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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110 *p = interp->next;
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111 PyMem_DEL(interp);
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112 }
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113
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114
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115 PyThreadState *
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116 PyThreadState_New(interp)
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117 PyInterpreterState *interp;
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118 {
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119 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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120
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121 if (tstate != NULL) {
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122 tstate->interp = interp;
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123
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124 tstate->frame = NULL;
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125 tstate->recursion_depth = 0;
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126 tstate->ticker = 0;
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127 tstate->tracing = 0;
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128
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129 tstate->dict = NULL;
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130
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131 tstate->curexc_type = NULL;
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132 tstate->curexc_value = NULL;
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133 tstate->curexc_traceback = NULL;
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134
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135 tstate->exc_type = NULL;
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136 tstate->exc_value = NULL;
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137 tstate->exc_traceback = NULL;
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138
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139 tstate->sys_profilefunc = NULL;
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140 tstate->sys_tracefunc = NULL;
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141
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142 tstate->next = interp->tstate_head;
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143 interp->tstate_head = tstate;
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144 }
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145
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146 return tstate;
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147 }
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148
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149
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150 void
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151 PyThreadState_Clear(tstate)
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152 PyThreadState *tstate;
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153 {
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154 if (Py_VerboseFlag && tstate->frame != NULL)
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155 fprintf(stderr,
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156 "PyThreadState_Clear: warning: thread still has a frame\n");
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157
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158 ZAP(tstate->frame);
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159
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160 ZAP(tstate->dict);
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161
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162 ZAP(tstate->curexc_type);
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163 ZAP(tstate->curexc_value);
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164 ZAP(tstate->curexc_traceback);
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165
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166 ZAP(tstate->exc_type);
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167 ZAP(tstate->exc_value);
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168 ZAP(tstate->exc_traceback);
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169
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170 ZAP(tstate->sys_profilefunc);
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171 ZAP(tstate->sys_tracefunc);
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172 }
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173
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174
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175 void
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176 PyThreadState_Delete(tstate)
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177 PyThreadState *tstate;
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178 {
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179 PyInterpreterState *interp;
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180 PyThreadState **p;
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181 if (tstate == NULL)
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182 Py_FatalError("PyThreadState_Delete: NULL tstate");
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183 if (tstate == _PyThreadState_Current)
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184 Py_FatalError("PyThreadState_Delete: tstate is still current");
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185 interp = tstate->interp;
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186 if (interp == NULL)
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187 Py_FatalError("PyThreadState_Delete: NULL interp");
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188 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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189 if (*p == NULL)
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190 Py_FatalError(
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191 "PyThreadState_Delete: invalid tstate");
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192 if (*p == tstate)
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193 break;
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194 }
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195 *p = tstate->next;
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196 PyMem_DEL(tstate);
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197 }
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198
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199
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200 PyThreadState *
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201 PyThreadState_Get()
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202 {
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203 if (_PyThreadState_Current == NULL)
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204 Py_FatalError("PyThreadState_Get: no current thread");
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205
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206 return _PyThreadState_Current;
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207 }
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208
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209
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210 PyThreadState *
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211 PyThreadState_Swap(new)
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212 PyThreadState *new;
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213 {
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214 PyThreadState *old = _PyThreadState_Current;
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215
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216 _PyThreadState_Current = new;
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217
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218 return old;
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219 }
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220
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221 /* An extension mechanism to store arbitrary additional per-thread state.
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222 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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223 state; the caller should pick a unique key and store its state there. If
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224 PyThreadState_GetDict() returns NULL, an exception has been raised (most
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225 likely MemoryError) and the caller should pass on the exception. */
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226
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227 PyObject *
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228 PyThreadState_GetDict()
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229 {
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230 if (_PyThreadState_Current == NULL)
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231 Py_FatalError("PyThreadState_GetDict: no current thread");
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232
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233 if (_PyThreadState_Current->dict == NULL)
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234 _PyThreadState_Current->dict = PyDict_New();
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235 return _PyThreadState_Current->dict;
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236 }