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annotate Python/pystate.c @ 28325:850626d47574 legacy-trunk

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Fixed SF bug #663074. The codec system was using global static variables to store internal data. As a result, any atempts to use the unicode system with multiple active interpreters, or successive interpreter executions, would fail. Now that information is stored into members of the PyInterpreterState structure.
author Gustavo Niemeyer <gustavo@niemeyer.net>
date Wed, 19 Mar 2003 00:35:36 +0000
parents 4b99a701defe
children 4f0b7acffc7d
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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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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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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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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 PyThreadFrameGetter _PyThreadState_GetFrame = NULL;
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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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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->tstate_head = NULL;
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52 interp->codec_search_path = NULL;
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53 interp->codec_search_cache = NULL;
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54 interp->codec_error_registry = 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->codec_error_registry);
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84 ZAP(interp->modules);
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85 ZAP(interp->sysdict);
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86 ZAP(interp->builtins);
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87 }
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89
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90 static void
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91 zapthreads(PyInterpreterState *interp)
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92 {
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93 PyThreadState *p;
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94 /* No need to lock the mutex here because this should only happen
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95 when the threads are all really dead (XXX famous last words). */
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96 while ((p = interp->tstate_head) != NULL) {
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97 PyThreadState_Delete(p);
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98 }
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99 }
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101
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102 void
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103 PyInterpreterState_Delete(PyInterpreterState *interp)
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104 {
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105 PyInterpreterState **p;
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106 zapthreads(interp);
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107 HEAD_LOCK();
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108 for (p = &interp_head; ; p = &(*p)->next) {
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109 if (*p == NULL)
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110 Py_FatalError(
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111 "PyInterpreterState_Delete: invalid interp");
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112 if (*p == interp)
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113 break;
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114 }
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115 if (interp->tstate_head != NULL)
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116 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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117 *p = interp->next;
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118 HEAD_UNLOCK();
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119 PyMem_DEL(interp);
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120 }
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121
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122
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123 /* Default implementation for _PyThreadState_GetFrame */
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124 static struct _frame *
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125 threadstate_getframe(PyThreadState *self)
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126 {
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127 return self->frame;
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128 }
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129
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130 PyThreadState *
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131 PyThreadState_New(PyInterpreterState *interp)
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132 {
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133 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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134 if (_PyThreadState_GetFrame == NULL)
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135 _PyThreadState_GetFrame = threadstate_getframe;
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136
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137 if (tstate != NULL) {
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138 tstate->interp = interp;
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139
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140 tstate->frame = NULL;
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141 tstate->recursion_depth = 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
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222 void
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diff changeset
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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diff changeset
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;
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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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240 tstate_delete_common(tstate);
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241 PyEval_ReleaseLock();
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242 }
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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.
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267 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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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
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270 likely MemoryError) and the caller should pass on the exception. */
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271
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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 }