Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 13267:4ce255495da3 legacy-trunk

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Jack Jansen, Mac patch: If we have stat.h include it if we don't have sys/stat.h
author Guido van Rossum <guido@python.org>
date Sat, 01 Jul 2000 01:08:11 +0000
parents 87ee82e5c56d
children f79434ee41fa
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Thread and interpreter state structures and their interfaces */
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12
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13 #include "Python.h"
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14
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15 #define ZAP(x) { \
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16 PyObject *tmp = (PyObject *)(x); \
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17 (x) = NULL; \
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18 Py_XDECREF(tmp); \
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19 }
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20
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21
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22 #ifdef WITH_THREAD
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23 #include "pythread.h"
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24 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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25 #define HEAD_INIT() (head_mutex || (head_mutex = PyThread_allocate_lock()))
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26 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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27 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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28 #else
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29 #define HEAD_INIT() /* Nothing */
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30 #define HEAD_LOCK() /* Nothing */
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31 #define HEAD_UNLOCK() /* Nothing */
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32 #endif
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33
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34 static PyInterpreterState *interp_head = NULL;
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35
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36 PyThreadState *_PyThreadState_Current = NULL;
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37
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38
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39 PyInterpreterState *
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40 PyInterpreterState_New()
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41 {
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42 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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43
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44 if (interp != NULL) {
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45 HEAD_INIT();
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46 interp->modules = NULL;
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47 interp->sysdict = NULL;
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48 interp->builtins = NULL;
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49 interp->checkinterval = 10;
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50 interp->tstate_head = NULL;
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51
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52 interp->next = interp_head;
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53 interp_head = interp;
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54 }
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55
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56 return interp;
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57 }
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58
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59
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60 void
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61 PyInterpreterState_Clear(interp)
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62 PyInterpreterState *interp;
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63 {
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64 PyThreadState *p;
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65 HEAD_LOCK();
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66 for (p = interp->tstate_head; p != NULL; p = p->next)
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67 PyThreadState_Clear(p);
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68 HEAD_UNLOCK();
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69 ZAP(interp->modules);
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70 ZAP(interp->sysdict);
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71 ZAP(interp->builtins);
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72 }
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73
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74
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75 static void
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76 zapthreads(interp)
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77 PyInterpreterState *interp;
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78 {
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79 PyThreadState *p;
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80 /* No need to lock the mutex here because this should only happen
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81 when the threads are all really dead (XXX famous last words). */
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82 while ((p = interp->tstate_head) != NULL) {
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83 PyThreadState_Delete(p);
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84 }
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85 }
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86
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87
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88 void
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89 PyInterpreterState_Delete(interp)
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90 PyInterpreterState *interp;
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91 {
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92 PyInterpreterState **p;
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93 zapthreads(interp);
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94 for (p = &interp_head; ; p = &(*p)->next) {
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95 if (*p == NULL)
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96 Py_FatalError(
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97 "PyInterpreterState_Delete: invalid interp");
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98 if (*p == interp)
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99 break;
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100 }
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101 if (interp->tstate_head != NULL)
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102 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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103 *p = interp->next;
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104 PyMem_DEL(interp);
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105 }
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106
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107
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108 PyThreadState *
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109 PyThreadState_New(interp)
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110 PyInterpreterState *interp;
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111 {
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112 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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113
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114 if (tstate != NULL) {
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115 tstate->interp = interp;
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116
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117 tstate->frame = NULL;
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118 tstate->recursion_depth = 0;
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119 tstate->ticker = 0;
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120 tstate->tracing = 0;
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121
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122 tstate->dict = NULL;
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123
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124 tstate->curexc_type = NULL;
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125 tstate->curexc_value = NULL;
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126 tstate->curexc_traceback = NULL;
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127
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128 tstate->exc_type = NULL;
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129 tstate->exc_value = NULL;
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130 tstate->exc_traceback = NULL;
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131
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132 tstate->sys_profilefunc = NULL;
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133 tstate->sys_tracefunc = NULL;
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134
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135 HEAD_LOCK();
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136 tstate->next = interp->tstate_head;
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137 interp->tstate_head = tstate;
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138 HEAD_UNLOCK();
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139 }
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140
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141 return tstate;
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142 }
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143
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144
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145 void
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146 PyThreadState_Clear(tstate)
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147 PyThreadState *tstate;
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148 {
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149 if (Py_VerboseFlag && tstate->frame != NULL)
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150 fprintf(stderr,
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151 "PyThreadState_Clear: warning: thread still has a frame\n");
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152
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153 ZAP(tstate->frame);
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154
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155 ZAP(tstate->dict);
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156
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157 ZAP(tstate->curexc_type);
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158 ZAP(tstate->curexc_value);
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159 ZAP(tstate->curexc_traceback);
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160
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161 ZAP(tstate->exc_type);
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162 ZAP(tstate->exc_value);
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163 ZAP(tstate->exc_traceback);
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164
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165 ZAP(tstate->sys_profilefunc);
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166 ZAP(tstate->sys_tracefunc);
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167 }
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168
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169
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170 void
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171 PyThreadState_Delete(tstate)
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172 PyThreadState *tstate;
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173 {
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174 PyInterpreterState *interp;
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175 PyThreadState **p;
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176 if (tstate == NULL)
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177 Py_FatalError("PyThreadState_Delete: NULL tstate");
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178 if (tstate == _PyThreadState_Current)
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179 Py_FatalError("PyThreadState_Delete: tstate is still current");
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180 interp = tstate->interp;
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181 if (interp == NULL)
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182 Py_FatalError("PyThreadState_Delete: NULL interp");
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183 HEAD_LOCK();
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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 HEAD_UNLOCK();
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193 PyMem_DEL(tstate);
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194 }
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195
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196
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197 PyThreadState *
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198 PyThreadState_Get()
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199 {
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200 if (_PyThreadState_Current == NULL)
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201 Py_FatalError("PyThreadState_Get: no current thread");
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202
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203 return _PyThreadState_Current;
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204 }
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205
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206
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207 PyThreadState *
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208 PyThreadState_Swap(new)
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209 PyThreadState *new;
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210 {
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211 PyThreadState *old = _PyThreadState_Current;
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212
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213 _PyThreadState_Current = new;
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214
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215 return old;
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216 }
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217
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218 /* An extension mechanism to store arbitrary additional per-thread state.
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219 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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220 state; the caller should pick a unique key and store its state there. If
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221 PyThreadState_GetDict() returns NULL, an exception has been raised (most
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222 likely MemoryError) and the caller should pass on the exception. */
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223
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224 PyObject *
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225 PyThreadState_GetDict()
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226 {
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227 if (_PyThreadState_Current == NULL)
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228 Py_FatalError("PyThreadState_GetDict: no current thread");
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229
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230 if (_PyThreadState_Current->dict == NULL)
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231 _PyThreadState_Current->dict = PyDict_New();
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232 return _PyThreadState_Current->dict;
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233 }