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annotate Python/pystate.c @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents 3b3c7b8ade7f
children 87ee82e5c56d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
13255
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7 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 ******************************************************************/
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16
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17 /* Thread and interpreter state structures and their interfaces */
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18
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19 #include "Python.h"
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20
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21 #define ZAP(x) { \
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22 PyObject *tmp = (PyObject *)(x); \
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23 (x) = NULL; \
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24 Py_XDECREF(tmp); \
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25 }
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26
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27
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28 #ifdef WITH_THREAD
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29 #include "pythread.h"
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30 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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31 #define HEAD_INIT() (head_mutex || (head_mutex = PyThread_allocate_lock()))
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32 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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33 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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34 #else
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35 #define HEAD_INIT() /* Nothing */
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36 #define HEAD_LOCK() /* Nothing */
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37 #define HEAD_UNLOCK() /* Nothing */
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38 #endif
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39
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40 static PyInterpreterState *interp_head = NULL;
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41
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42 PyThreadState *_PyThreadState_Current = NULL;
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43
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44
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45 PyInterpreterState *
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46 PyInterpreterState_New()
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47 {
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48 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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49
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50 if (interp != NULL) {
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51 HEAD_INIT();
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52 interp->modules = NULL;
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53 interp->sysdict = NULL;
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54 interp->builtins = NULL;
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55 interp->checkinterval = 10;
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56 interp->tstate_head = NULL;
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57
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58 interp->next = interp_head;
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59 interp_head = interp;
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60 }
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61
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62 return interp;
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63 }
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64
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65
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66 void
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67 PyInterpreterState_Clear(interp)
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68 PyInterpreterState *interp;
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69 {
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70 PyThreadState *p;
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71 HEAD_LOCK();
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72 for (p = interp->tstate_head; p != NULL; p = p->next)
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73 PyThreadState_Clear(p);
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74 HEAD_UNLOCK();
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75 ZAP(interp->modules);
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76 ZAP(interp->sysdict);
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77 ZAP(interp->builtins);
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78 }
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79
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80
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81 static void
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82 zapthreads(interp)
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83 PyInterpreterState *interp;
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84 {
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85 PyThreadState *p;
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86 /* No need to lock the mutex here because this should only happen
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87 when the threads are all really dead (XXX famous last words). */
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88 while ((p = interp->tstate_head) != NULL) {
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89 PyThreadState_Delete(p);
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90 }
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91 }
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92
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93
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94 void
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95 PyInterpreterState_Delete(interp)
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96 PyInterpreterState *interp;
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97 {
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98 PyInterpreterState **p;
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99 zapthreads(interp);
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100 for (p = &interp_head; ; p = &(*p)->next) {
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101 if (*p == NULL)
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102 Py_FatalError(
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103 "PyInterpreterState_Delete: invalid interp");
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104 if (*p == interp)
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105 break;
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106 }
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107 if (interp->tstate_head != NULL)
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108 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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109 *p = interp->next;
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110 PyMem_DEL(interp);
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111 }
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112
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113
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114 PyThreadState *
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115 PyThreadState_New(interp)
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116 PyInterpreterState *interp;
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117 {
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118 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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119
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120 if (tstate != NULL) {
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121 tstate->interp = interp;
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122
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123 tstate->frame = NULL;
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124 tstate->recursion_depth = 0;
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125 tstate->ticker = 0;
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126 tstate->tracing = 0;
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127
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128 tstate->dict = NULL;
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129
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130 tstate->curexc_type = NULL;
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131 tstate->curexc_value = NULL;
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132 tstate->curexc_traceback = NULL;
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133
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134 tstate->exc_type = NULL;
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135 tstate->exc_value = NULL;
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136 tstate->exc_traceback = NULL;
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137
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138 tstate->sys_profilefunc = NULL;
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139 tstate->sys_tracefunc = NULL;
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140
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141 HEAD_LOCK();
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142 tstate->next = interp->tstate_head;
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143 interp->tstate_head = tstate;
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144 HEAD_UNLOCK();
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145 }
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146
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147 return tstate;
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148 }
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149
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150
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151 void
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152 PyThreadState_Clear(tstate)
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153 PyThreadState *tstate;
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154 {
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155 if (Py_VerboseFlag && tstate->frame != NULL)
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156 fprintf(stderr,
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157 "PyThreadState_Clear: warning: thread still has a frame\n");
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158
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159 ZAP(tstate->frame);
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160
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161 ZAP(tstate->dict);
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162
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163 ZAP(tstate->curexc_type);
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164 ZAP(tstate->curexc_value);
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165 ZAP(tstate->curexc_traceback);
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166
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167 ZAP(tstate->exc_type);
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168 ZAP(tstate->exc_value);
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169 ZAP(tstate->exc_traceback);
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170
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171 ZAP(tstate->sys_profilefunc);
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172 ZAP(tstate->sys_tracefunc);
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173 }
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174
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175
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176 void
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177 PyThreadState_Delete(tstate)
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178 PyThreadState *tstate;
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179 {
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180 PyInterpreterState *interp;
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181 PyThreadState **p;
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182 if (tstate == NULL)
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183 Py_FatalError("PyThreadState_Delete: NULL tstate");
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184 if (tstate == _PyThreadState_Current)
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185 Py_FatalError("PyThreadState_Delete: tstate is still current");
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186 interp = tstate->interp;
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187 if (interp == NULL)
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188 Py_FatalError("PyThreadState_Delete: NULL interp");
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189 HEAD_LOCK();
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190 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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191 if (*p == NULL)
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192 Py_FatalError(
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193 "PyThreadState_Delete: invalid tstate");
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194 if (*p == tstate)
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195 break;
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196 }
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197 *p = tstate->next;
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198 HEAD_UNLOCK();
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199 PyMem_DEL(tstate);
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200 }
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201
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202
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203 PyThreadState *
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204 PyThreadState_Get()
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205 {
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206 if (_PyThreadState_Current == NULL)
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207 Py_FatalError("PyThreadState_Get: no current thread");
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208
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209 return _PyThreadState_Current;
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210 }
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211
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212
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213 PyThreadState *
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214 PyThreadState_Swap(new)
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215 PyThreadState *new;
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216 {
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217 PyThreadState *old = _PyThreadState_Current;
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218
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219 _PyThreadState_Current = new;
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220
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221 return old;
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222 }
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223
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224 /* An extension mechanism to store arbitrary additional per-thread state.
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225 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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226 state; the caller should pick a unique key and store its state there. If
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227 PyThreadState_GetDict() returns NULL, an exception has been raised (most
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228 likely MemoryError) and the caller should pass on the exception. */
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229
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230 PyObject *
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231 PyThreadState_GetDict()
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232 {
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233 if (_PyThreadState_Current == NULL)
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234 Py_FatalError("PyThreadState_GetDict: no current thread");
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235
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236 if (_PyThreadState_Current->dict == NULL)
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237 _PyThreadState_Current->dict = PyDict_New();
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238 return _PyThreadState_Current->dict;
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239 }