Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 16845:09dcf5ebcd80 legacy-trunk

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Now that Jeremy is asking about this code, it looks really bogus to me, so let's rip it out. The constructor for SyntaxError does the right thing, so we do not need to do it again.
author Fred Drake <fdrake@acm.org>
date Wed, 28 Feb 2001 20:58:04 +0000
parents d96ce9708c00
children e427afb5637f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #define ZAP(x) { \
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7 PyObject *tmp = (PyObject *)(x); \
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8 (x) = NULL; \
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9 Py_XDECREF(tmp); \
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10 }
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12
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13 #ifdef WITH_THREAD
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14 #include "pythread.h"
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15 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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16 #define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
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17 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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18 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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19 #else
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20 #define HEAD_INIT() /* Nothing */
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21 #define HEAD_LOCK() /* Nothing */
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22 #define HEAD_UNLOCK() /* Nothing */
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23 #endif
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24
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25 static PyInterpreterState *interp_head = NULL;
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26
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27 PyThreadState *_PyThreadState_Current = NULL;
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30 PyInterpreterState *
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31 PyInterpreterState_New(void)
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32 {
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33 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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34
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35 if (interp != NULL) {
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36 HEAD_INIT();
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37 interp->modules = NULL;
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38 interp->sysdict = NULL;
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39 interp->builtins = NULL;
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40 interp->checkinterval = 10;
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41 interp->tstate_head = NULL;
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42
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43 HEAD_LOCK();
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44 interp->next = interp_head;
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45 interp_head = interp;
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46 HEAD_UNLOCK();
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47 }
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48
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49 return interp;
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50 }
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52
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53 void
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54 PyInterpreterState_Clear(PyInterpreterState *interp)
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55 {
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56 PyThreadState *p;
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57 HEAD_LOCK();
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58 for (p = interp->tstate_head; p != NULL; p = p->next)
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59 PyThreadState_Clear(p);
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60 HEAD_UNLOCK();
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61 ZAP(interp->modules);
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62 ZAP(interp->sysdict);
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63 ZAP(interp->builtins);
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64 }
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66
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67 static void
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68 zapthreads(PyInterpreterState *interp)
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69 {
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70 PyThreadState *p;
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71 /* No need to lock the mutex here because this should only happen
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72 when the threads are all really dead (XXX famous last words). */
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73 while ((p = interp->tstate_head) != NULL) {
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74 PyThreadState_Delete(p);
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75 }
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76 }
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78
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79 void
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80 PyInterpreterState_Delete(PyInterpreterState *interp)
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81 {
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82 PyInterpreterState **p;
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83 zapthreads(interp);
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84 HEAD_LOCK();
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85 for (p = &interp_head; ; p = &(*p)->next) {
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86 if (*p == NULL)
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87 Py_FatalError(
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88 "PyInterpreterState_Delete: invalid interp");
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89 if (*p == interp)
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90 break;
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91 }
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92 if (interp->tstate_head != NULL)
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93 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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94 *p = interp->next;
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95 HEAD_UNLOCK();
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96 PyMem_DEL(interp);
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97 }
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98
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99
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100 PyThreadState *
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101 PyThreadState_New(PyInterpreterState *interp)
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102 {
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103 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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104
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105 if (tstate != NULL) {
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106 tstate->interp = interp;
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107
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108 tstate->frame = NULL;
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109 tstate->recursion_depth = 0;
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110 tstate->ticker = 0;
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111 tstate->tracing = 0;
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112
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113 tstate->dict = NULL;
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114
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115 tstate->curexc_type = NULL;
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116 tstate->curexc_value = NULL;
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117 tstate->curexc_traceback = NULL;
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118
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119 tstate->exc_type = NULL;
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120 tstate->exc_value = NULL;
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121 tstate->exc_traceback = NULL;
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122
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123 tstate->sys_profilefunc = NULL;
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124 tstate->sys_tracefunc = NULL;
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125
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126 HEAD_LOCK();
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127 tstate->next = interp->tstate_head;
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128 interp->tstate_head = tstate;
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129 HEAD_UNLOCK();
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130 }
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131
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132 return tstate;
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133 }
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134
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135
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136 void
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137 PyThreadState_Clear(PyThreadState *tstate)
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138 {
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139 if (Py_VerboseFlag && tstate->frame != NULL)
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140 fprintf(stderr,
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141 "PyThreadState_Clear: warning: thread still has a frame\n");
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142
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143 ZAP(tstate->frame);
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144
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145 ZAP(tstate->dict);
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146
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147 ZAP(tstate->curexc_type);
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148 ZAP(tstate->curexc_value);
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149 ZAP(tstate->curexc_traceback);
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150
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151 ZAP(tstate->exc_type);
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152 ZAP(tstate->exc_value);
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153 ZAP(tstate->exc_traceback);
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154
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155 ZAP(tstate->sys_profilefunc);
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156 ZAP(tstate->sys_tracefunc);
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157 }
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158
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159
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160 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
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161 static void
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162 tstate_delete_common(PyThreadState *tstate)
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163 {
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164 PyInterpreterState *interp;
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165 PyThreadState **p;
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166 if (tstate == NULL)
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167 Py_FatalError("PyThreadState_Delete: NULL tstate");
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168 interp = tstate->interp;
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169 if (interp == NULL)
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170 Py_FatalError("PyThreadState_Delete: NULL interp");
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171 HEAD_LOCK();
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172 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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173 if (*p == NULL)
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174 Py_FatalError(
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175 "PyThreadState_Delete: invalid tstate");
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176 if (*p == tstate)
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177 break;
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178 }
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179 *p = tstate->next;
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180 HEAD_UNLOCK();
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181 PyMem_DEL(tstate);
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182 }
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183
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184
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185 void
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186 PyThreadState_Delete(PyThreadState *tstate)
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187 {
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188 if (tstate == _PyThreadState_Current)
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189 Py_FatalError("PyThreadState_Delete: tstate is still current");
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190 tstate_delete_common(tstate);
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191 }
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192
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193
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194 #ifdef WITH_THREAD
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195 void
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196 PyThreadState_DeleteCurrent()
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197 {
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198 PyThreadState *tstate = _PyThreadState_Current;
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199 if (tstate == NULL)
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200 Py_FatalError(
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201 "PyThreadState_DeleteCurrent: no current tstate");
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202 _PyThreadState_Current = NULL;
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203 tstate_delete_common(tstate);
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204 PyEval_ReleaseLock();
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205 }
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206 #endif /* WITH_THREAD */
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207
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208
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209 PyThreadState *
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210 PyThreadState_Get(void)
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211 {
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212 if (_PyThreadState_Current == NULL)
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213 Py_FatalError("PyThreadState_Get: no current thread");
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214
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215 return _PyThreadState_Current;
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216 }
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217
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218
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219 PyThreadState *
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220 PyThreadState_Swap(PyThreadState *new)
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221 {
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222 PyThreadState *old = _PyThreadState_Current;
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223
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224 _PyThreadState_Current = new;
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225
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226 return old;
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227 }
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228
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229 /* An extension mechanism to store arbitrary additional per-thread state.
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230 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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231 state; the caller should pick a unique key and store its state there. If
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232 PyThreadState_GetDict() returns NULL, an exception has been raised (most
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233 likely MemoryError) and the caller should pass on the exception. */
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234
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235 PyObject *
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236 PyThreadState_GetDict(void)
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237 {
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238 if (_PyThreadState_Current == NULL)
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239 Py_FatalError("PyThreadState_GetDict: no current thread");
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240
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241 if (_PyThreadState_Current->dict == NULL)
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242 _PyThreadState_Current->dict = PyDict_New();
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243 return _PyThreadState_Current->dict;
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244 }