Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 5926:8d2194e22e67 legacy-trunk

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The last of the mass checkins for separate (sub)interpreters. Everything should now work again. See the comments for the .h files mass checkin (e.g. pystate.h) for more detail.
author Guido van Rossum <guido@python.org>
date Sat, 02 Aug 1997 03:10:38 +0000
parents 0d7851b37ad2
children cc2c84769636
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 #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 static PyThreadState *current_tstate = 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->curexc_type = NULL;
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130 tstate->curexc_value = NULL;
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131 tstate->curexc_traceback = NULL;
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132
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133 tstate->exc_type = NULL;
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134 tstate->exc_value = NULL;
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135 tstate->exc_traceback = NULL;
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136
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137 tstate->sys_profilefunc = NULL;
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138 tstate->sys_tracefunc = NULL;
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139
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140 tstate->next = interp->tstate_head;
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141 interp->tstate_head = tstate;
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142 }
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143
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144 return tstate;
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145 }
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146
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147
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148 void
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149 PyThreadState_Clear(tstate)
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150 PyThreadState *tstate;
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151 {
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152 if (tstate->frame != NULL)
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153 fprintf(stderr,
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154 "PyThreadState_Clear: warning: thread still has a frame");
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155
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156 ZAP(tstate->frame);
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157
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158 ZAP(tstate->curexc_type);
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159 ZAP(tstate->curexc_value);
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160 ZAP(tstate->curexc_traceback);
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161
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162 ZAP(tstate->exc_type);
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163 ZAP(tstate->exc_value);
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164 ZAP(tstate->exc_traceback);
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165
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166 ZAP(tstate->sys_profilefunc);
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167 ZAP(tstate->sys_tracefunc);
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168 }
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169
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170
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171 void
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172 PyThreadState_Delete(tstate)
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173 PyThreadState *tstate;
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174 {
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175 PyInterpreterState *interp;
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176 PyThreadState **p;
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177 if (tstate == NULL)
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178 Py_FatalError("PyThreadState_Delete: NULL tstate");
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179 if (tstate == current_tstate)
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180 Py_FatalError("PyThreadState_Delete: tstate is still current");
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181 interp = tstate->interp;
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182 if (interp == NULL)
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183 Py_FatalError("PyThreadState_Delete: NULL interp");
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184 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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185 if (*p == NULL)
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186 Py_FatalError(
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187 "PyThreadState_Delete: invalid tstate");
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188 if (*p == tstate)
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189 break;
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190 }
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191 *p = tstate->next;
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192 PyMem_DEL(tstate);
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193 }
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194
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195
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196 PyThreadState *
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197 PyThreadState_Get()
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198 {
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199 if (current_tstate == NULL)
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200 Py_FatalError("PyThreadState_Get: no current thread");
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201
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202 return current_tstate;
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203 }
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204
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205
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206 PyThreadState *
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207 PyThreadState_Swap(new)
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208 PyThreadState *new;
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209 {
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210 PyThreadState *old = current_tstate;
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211
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212 current_tstate = new;
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213
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214 return old;
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215 }