Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 16829:6732905686d4 legacy-trunk

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author Tim Peters <tim.peters@gmail.com>
date Wed, 28 Feb 2001 05:56:18 +0000
parents d96ce9708c00
children e427afb5637f
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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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51
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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 }