annotate Python/pystate.c @ 28462:a8d6576b95af 2.2

Patch #710576: Implement per-interpreter-state codec registries.
author Martin v. Löwis <martin@v.loewis.de>
date Sun, 30 Mar 2003 20:57:31 +0000
parents 63c6f45e947d
children
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1
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2 /* Thread and interpreter state structures and their interfaces */
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3
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4 #include "Python.h"
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5
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6 #ifdef HAVE_DLOPEN
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7 #ifdef HAVE_DLFCN_H
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8 #include <dlfcn.h>
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9 #endif
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10 #ifndef RTLD_LAZY
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11 #define RTLD_LAZY 1
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12 #endif
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13 #endif
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14
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15
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16 #define ZAP(x) { \
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17 PyObject *tmp = (PyObject *)(x); \
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18 (x) = NULL; \
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19 Py_XDECREF(tmp); \
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20 }
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22
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23 #ifdef WITH_THREAD
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24 #include "pythread.h"
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25 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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26 #define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
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27 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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28 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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29 #else
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30 #define HEAD_INIT() /* Nothing */
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31 #define HEAD_LOCK() /* Nothing */
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32 #define HEAD_UNLOCK() /* Nothing */
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33 #endif
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34
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35 static PyInterpreterState *interp_head = NULL;
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36
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37 PyThreadState *_PyThreadState_Current = NULL;
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38 unaryfunc _PyThreadState_GetFrame = NULL;
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40
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41 PyInterpreterState *
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42 PyInterpreterState_New(void)
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43 {
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44 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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45
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46 if (interp != NULL) {
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47 HEAD_INIT();
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48 interp->modules = NULL;
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49 interp->sysdict = NULL;
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50 interp->builtins = NULL;
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51 interp->checkinterval = 10;
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52 interp->tstate_head = NULL;
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53 interp->codec_search_path = NULL;
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54 interp->codec_search_cache = NULL;
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55 #ifdef HAVE_DLOPEN
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56 #ifdef RTLD_NOW
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57 interp->dlopenflags = RTLD_NOW;
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58 #else
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59 interp->dlopenflags = RTLD_LAZY;
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60 #endif
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61 #endif
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62
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63 HEAD_LOCK();
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64 interp->next = interp_head;
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65 interp_head = interp;
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66 HEAD_UNLOCK();
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67 }
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68
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69 return interp;
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70 }
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72
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73 void
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74 PyInterpreterState_Clear(PyInterpreterState *interp)
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75 {
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76 PyThreadState *p;
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77 HEAD_LOCK();
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78 for (p = interp->tstate_head; p != NULL; p = p->next)
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79 PyThreadState_Clear(p);
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80 HEAD_UNLOCK();
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81 ZAP(interp->codec_search_path);
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82 ZAP(interp->codec_search_cache);
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83 ZAP(interp->modules);
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84 ZAP(interp->sysdict);
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85 ZAP(interp->builtins);
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86 }
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88
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89 static void
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90 zapthreads(PyInterpreterState *interp)
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91 {
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92 PyThreadState *p;
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93 /* No need to lock the mutex here because this should only happen
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94 when the threads are all really dead (XXX famous last words). */
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95 while ((p = interp->tstate_head) != NULL) {
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96 PyThreadState_Delete(p);
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97 }
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98 }
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100
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101 void
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102 PyInterpreterState_Delete(PyInterpreterState *interp)
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103 {
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104 PyInterpreterState **p;
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105 zapthreads(interp);
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106 HEAD_LOCK();
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107 for (p = &interp_head; ; p = &(*p)->next) {
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108 if (*p == NULL)
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109 Py_FatalError(
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110 "PyInterpreterState_Delete: invalid interp");
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111 if (*p == interp)
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112 break;
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113 }
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114 if (interp->tstate_head != NULL)
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115 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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116 *p = interp->next;
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117 HEAD_UNLOCK();
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118 PyMem_DEL(interp);
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119 }
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120
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121
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122 /* Default implementation for _PyThreadState_GetFrame */
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123 static struct _frame *
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124 threadstate_getframe(PyThreadState *self)
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125 {
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126 return self->frame;
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127 }
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128
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129 PyThreadState *
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130 PyThreadState_New(PyInterpreterState *interp)
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131 {
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132 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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133 if (_PyThreadState_GetFrame == NULL)
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134 _PyThreadState_GetFrame = (unaryfunc)threadstate_getframe;
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135
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136 if (tstate != NULL) {
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137 tstate->interp = interp;
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138
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139 tstate->frame = NULL;
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140 tstate->recursion_depth = 0;
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141 tstate->ticker = 0;
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142 tstate->tracing = 0;
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143 tstate->use_tracing = 0;
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144 tstate->tick_counter = 0;
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145
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146 tstate->dict = NULL;
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147
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148 tstate->curexc_type = NULL;
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149 tstate->curexc_value = NULL;
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150 tstate->curexc_traceback = NULL;
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151
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152 tstate->exc_type = NULL;
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153 tstate->exc_value = NULL;
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154 tstate->exc_traceback = NULL;
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155
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156 tstate->c_profilefunc = NULL;
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157 tstate->c_tracefunc = NULL;
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158 tstate->c_profileobj = NULL;
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159 tstate->c_traceobj = NULL;
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160
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161 HEAD_LOCK();
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162 tstate->next = interp->tstate_head;
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163 interp->tstate_head = tstate;
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164 HEAD_UNLOCK();
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165 }
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166
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167 return tstate;
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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_Clear(PyThreadState *tstate)
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173 {
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174 if (Py_VerboseFlag && tstate->frame != NULL)
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175 fprintf(stderr,
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176 "PyThreadState_Clear: warning: thread still has a frame\n");
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177
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178 ZAP(tstate->frame);
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179
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180 ZAP(tstate->dict);
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181
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182 ZAP(tstate->curexc_type);
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183 ZAP(tstate->curexc_value);
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184 ZAP(tstate->curexc_traceback);
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185
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186 ZAP(tstate->exc_type);
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187 ZAP(tstate->exc_value);
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188 ZAP(tstate->exc_traceback);
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189
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190 tstate->c_profilefunc = NULL;
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191 tstate->c_tracefunc = NULL;
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192 ZAP(tstate->c_profileobj);
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193 ZAP(tstate->c_traceobj);
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194 }
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195
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196
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197 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
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198 static void
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199 tstate_delete_common(PyThreadState *tstate)
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200 {
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201 PyInterpreterState *interp;
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202 PyThreadState **p;
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203 if (tstate == NULL)
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204 Py_FatalError("PyThreadState_Delete: NULL tstate");
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205 interp = tstate->interp;
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206 if (interp == NULL)
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207 Py_FatalError("PyThreadState_Delete: NULL interp");
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208 HEAD_LOCK();
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209 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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210 if (*p == NULL)
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211 Py_FatalError(
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212 "PyThreadState_Delete: invalid tstate");
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213 if (*p == tstate)
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214 break;
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215 }
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216 *p = tstate->next;
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217 HEAD_UNLOCK();
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218 PyMem_DEL(tstate);
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219 }
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220
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221
16139
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222 void
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223 PyThreadState_Delete(PyThreadState *tstate)
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diff changeset
224 {
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225 if (tstate == _PyThreadState_Current)
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226 Py_FatalError("PyThreadState_Delete: tstate is still current");
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227 tstate_delete_common(tstate);
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228 }
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229
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230
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diff changeset
231 #ifdef WITH_THREAD
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diff changeset
232 void
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233 PyThreadState_DeleteCurrent()
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234 {
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235 PyThreadState *tstate = _PyThreadState_Current;
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
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236 if (tstate == NULL)
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237 Py_FatalError(
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238 "PyThreadState_DeleteCurrent: no current tstate");
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239 _PyThreadState_Current = NULL;
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diff changeset
240 tstate_delete_common(tstate);
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Guido van Rossum <guido@python.org>
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241 PyEval_ReleaseLock();
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242 }
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diff changeset
243 #endif /* WITH_THREAD */
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244
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245
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246 PyThreadState *
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247 PyThreadState_Get(void)
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248 {
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249 if (_PyThreadState_Current == NULL)
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250 Py_FatalError("PyThreadState_Get: no current thread");
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251
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252 return _PyThreadState_Current;
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253 }
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254
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255
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256 PyThreadState *
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257 PyThreadState_Swap(PyThreadState *new)
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258 {
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259 PyThreadState *old = _PyThreadState_Current;
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260
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261 _PyThreadState_Current = new;
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262
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263 return old;
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264 }
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265
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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266 /* An extension mechanism to store arbitrary additional per-thread state.
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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267 PyThreadState_GetDict() returns a dictionary that can be used to hold such
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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268 state; the caller should pick a unique key and store its state there. If
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269 PyThreadState_GetDict() returns NULL, an exception has been raised (most
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
270 likely MemoryError) and the caller should pass on the exception. */
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271
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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272 PyObject *
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273 PyThreadState_GetDict(void)
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274 {
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275 if (_PyThreadState_Current == NULL)
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276 Py_FatalError("PyThreadState_GetDict: no current thread");
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277
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278 if (_PyThreadState_Current->dict == NULL)
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279 _PyThreadState_Current->dict = PyDict_New();
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280 return _PyThreadState_Current->dict;
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281 }
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282
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283
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284 /* Routines for advanced debuggers, requested by David Beazley.
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285 Don't use unless you know what you are doing! */
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286
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287 PyInterpreterState *
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288 PyInterpreterState_Head(void)
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289 {
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290 return interp_head;
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291 }
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292
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293 PyInterpreterState *
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294 PyInterpreterState_Next(PyInterpreterState *interp) {
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295 return interp->next;
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296 }
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297
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298 PyThreadState *
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299 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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300 return interp->tstate_head;
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301 }
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302
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303 PyThreadState *
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304 PyThreadState_Next(PyThreadState *tstate) {
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305 return tstate->next;
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306 }