Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 25135:0f0016632be4 legacy-trunk

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_formatparam(), set_param(): RFC 2231 encoding support by Oleg Broytmann in SF patch #600096. Specifically, the former function now encodes the triplets, while the latter adds optional charset and language arguments.
author Barry Warsaw <barry@python.org>
date Fri, 06 Sep 2002 03:55:04 +0000
parents b470b417839d
children e61b946474df
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 #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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15
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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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22
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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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34
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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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40 PyInterpreterState *
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41 PyInterpreterState_New(void)
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42 {
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43 PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
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44
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45 if (interp != NULL) {
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46 HEAD_INIT();
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47 interp->modules = NULL;
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48 interp->sysdict = NULL;
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49 interp->builtins = NULL;
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50 interp->tstate_head = NULL;
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51 #ifdef HAVE_DLOPEN
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52 #ifdef RTLD_NOW
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53 interp->dlopenflags = RTLD_NOW;
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54 #else
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55 interp->dlopenflags = RTLD_LAZY;
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56 #endif
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57 #endif
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58
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59 HEAD_LOCK();
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60 interp->next = interp_head;
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61 interp_head = interp;
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62 HEAD_UNLOCK();
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63 }
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64
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65 return interp;
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66 }
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67
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68
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69 void
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70 PyInterpreterState_Clear(PyInterpreterState *interp)
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71 {
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72 PyThreadState *p;
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73 HEAD_LOCK();
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74 for (p = interp->tstate_head; p != NULL; p = p->next)
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75 PyThreadState_Clear(p);
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76 HEAD_UNLOCK();
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77 ZAP(interp->modules);
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78 ZAP(interp->sysdict);
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79 ZAP(interp->builtins);
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80 }
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81
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82
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83 static void
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84 zapthreads(PyInterpreterState *interp)
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85 {
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86 PyThreadState *p;
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87 /* No need to lock the mutex here because this should only happen
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88 when the threads are all really dead (XXX famous last words). */
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89 while ((p = interp->tstate_head) != NULL) {
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90 PyThreadState_Delete(p);
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91 }
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92 }
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93
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94
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95 void
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96 PyInterpreterState_Delete(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 HEAD_LOCK();
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101 for (p = &interp_head; ; p = &(*p)->next) {
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102 if (*p == NULL)
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103 Py_FatalError(
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104 "PyInterpreterState_Delete: invalid interp");
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105 if (*p == interp)
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106 break;
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107 }
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108 if (interp->tstate_head != NULL)
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109 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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110 *p = interp->next;
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111 HEAD_UNLOCK();
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112 PyMem_DEL(interp);
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113 }
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114
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115
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116 PyThreadState *
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117 PyThreadState_New(PyInterpreterState *interp)
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118 {
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119 PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
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120
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121 if (tstate != NULL) {
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122 tstate->interp = interp;
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123
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124 tstate->frame = NULL;
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125 tstate->recursion_depth = 0;
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126 tstate->tracing = 0;
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127 tstate->use_tracing = 0;
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128
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129 tstate->dict = NULL;
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130
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131 tstate->curexc_type = NULL;
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132 tstate->curexc_value = NULL;
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133 tstate->curexc_traceback = NULL;
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134
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135 tstate->exc_type = NULL;
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136 tstate->exc_value = NULL;
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137 tstate->exc_traceback = NULL;
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138
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139 tstate->c_profilefunc = NULL;
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140 tstate->c_tracefunc = NULL;
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141 tstate->c_profileobj = NULL;
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142 tstate->c_traceobj = NULL;
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143
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144 HEAD_LOCK();
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145 tstate->next = interp->tstate_head;
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146 interp->tstate_head = tstate;
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147 HEAD_UNLOCK();
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148 }
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149
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150 return tstate;
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151 }
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152
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153
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154 void
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155 PyThreadState_Clear(PyThreadState *tstate)
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156 {
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157 if (Py_VerboseFlag && tstate->frame != NULL)
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158 fprintf(stderr,
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159 "PyThreadState_Clear: warning: thread still has a frame\n");
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160
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161 ZAP(tstate->frame);
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162
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163 ZAP(tstate->dict);
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164
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165 ZAP(tstate->curexc_type);
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166 ZAP(tstate->curexc_value);
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167 ZAP(tstate->curexc_traceback);
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168
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169 ZAP(tstate->exc_type);
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170 ZAP(tstate->exc_value);
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171 ZAP(tstate->exc_traceback);
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172
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173 tstate->c_profilefunc = NULL;
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174 tstate->c_tracefunc = NULL;
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175 ZAP(tstate->c_profileobj);
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176 ZAP(tstate->c_traceobj);
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177 }
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178
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179
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180 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
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181 static void
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182 tstate_delete_common(PyThreadState *tstate)
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183 {
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184 PyInterpreterState *interp;
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185 PyThreadState **p;
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186 if (tstate == NULL)
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187 Py_FatalError("PyThreadState_Delete: NULL tstate");
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188 interp = tstate->interp;
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189 if (interp == NULL)
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190 Py_FatalError("PyThreadState_Delete: NULL interp");
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191 HEAD_LOCK();
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192 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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193 if (*p == NULL)
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194 Py_FatalError(
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195 "PyThreadState_Delete: invalid tstate");
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196 if (*p == tstate)
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197 break;
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198 }
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199 *p = tstate->next;
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200 HEAD_UNLOCK();
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201 PyMem_DEL(tstate);
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202 }
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203
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204
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205 void
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206 PyThreadState_Delete(PyThreadState *tstate)
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207 {
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208 if (tstate == _PyThreadState_Current)
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209 Py_FatalError("PyThreadState_Delete: tstate is still current");
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210 tstate_delete_common(tstate);
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211 }
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212
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213
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214 #ifdef WITH_THREAD
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215 void
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216 PyThreadState_DeleteCurrent()
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217 {
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218 PyThreadState *tstate = _PyThreadState_Current;
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219 if (tstate == NULL)
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220 Py_FatalError(
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221 "PyThreadState_DeleteCurrent: no current tstate");
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222 _PyThreadState_Current = NULL;
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223 tstate_delete_common(tstate);
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224 PyEval_ReleaseLock();
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225 }
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226 #endif /* WITH_THREAD */
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227
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228
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229 PyThreadState *
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230 PyThreadState_Get(void)
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231 {
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232 if (_PyThreadState_Current == NULL)
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233 Py_FatalError("PyThreadState_Get: no current thread");
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234
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235 return _PyThreadState_Current;
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236 }
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237
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238
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239 PyThreadState *
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240 PyThreadState_Swap(PyThreadState *new)
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241 {
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242 PyThreadState *old = _PyThreadState_Current;
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243
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244 _PyThreadState_Current = new;
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245
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246 return old;
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247 }
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248
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249 /* An extension mechanism to store arbitrary additional per-thread state.
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250 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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251 state; the caller should pick a unique key and store its state there. If
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252 PyThreadState_GetDict() returns NULL, an exception has been raised (most
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253 likely MemoryError) and the caller should pass on the exception. */
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254
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255 PyObject *
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256 PyThreadState_GetDict(void)
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257 {
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258 if (_PyThreadState_Current == NULL)
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259 Py_FatalError("PyThreadState_GetDict: no current thread");
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260
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261 if (_PyThreadState_Current->dict == NULL)
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262 _PyThreadState_Current->dict = PyDict_New();
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263 return _PyThreadState_Current->dict;
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264 }
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265
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266
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267 /* Routines for advanced debuggers, requested by David Beazley.
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268 Don't use unless you know what you are doing! */
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269
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270 PyInterpreterState *
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271 PyInterpreterState_Head(void)
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272 {
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273 return interp_head;
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274 }
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275
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276 PyInterpreterState *
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277 PyInterpreterState_Next(PyInterpreterState *interp) {
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278 return interp->next;
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279 }
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280
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281 PyThreadState *
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282 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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283 return interp->tstate_head;
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284 }
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285
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286 PyThreadState *
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287 PyThreadState_Next(PyThreadState *tstate) {
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288 return tstate->next;
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289 }