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annotate Python/pystate.c @ 59857:ec6a995ecfbf

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Merged revisions 79205,79219,79228,79230,79232-79233,79235,79237 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r79205 | benjamin.peterson | 2010-03-21 12:34:54 -0500 (Sun, 21 Mar 2010) | 1 line rewrite a bit ........ r79219 | benjamin.peterson | 2010-03-21 14:24:08 -0500 (Sun, 21 Mar 2010) | 1 line flatten condition ........ r79228 | benjamin.peterson | 2010-03-21 14:35:39 -0500 (Sun, 21 Mar 2010) | 1 line remove pointless condition ........ r79230 | benjamin.peterson | 2010-03-21 14:39:52 -0500 (Sun, 21 Mar 2010) | 1 line co_varnames is certainly a tuple, so let's not waste time finding out ........ r79232 | benjamin.peterson | 2010-03-21 14:54:56 -0500 (Sun, 21 Mar 2010) | 1 line fix import ........ r79233 | benjamin.peterson | 2010-03-21 14:56:37 -0500 (Sun, 21 Mar 2010) | 1 line don't write duplicate tests ........ r79235 | benjamin.peterson | 2010-03-21 15:21:00 -0500 (Sun, 21 Mar 2010) | 4 lines improve error message from passing inadequate number of keyword arguments #6474 Note this removes the "non-keyword" or "keyword" phrases from these messages. ........ r79237 | benjamin.peterson | 2010-03-21 15:30:30 -0500 (Sun, 21 Mar 2010) | 1 line take into account keyword arguments when passing too many args ........
author Benjamin Peterson <benjamin@python.org>
date Sun, 21 Mar 2010 21:00:50 +0000
parents dd8527399582
children 4fd3ab5fa71d
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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 /* --------------------------------------------------------------------------
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7 CAUTION
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8
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9 Always use malloc() and free() directly in this file. A number of these
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10 functions are advertised as safe to call when the GIL isn't held, and in
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11 a debug build Python redirects (e.g.) PyMem_NEW (etc) to Python's debugging
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12 obmalloc functions. Those aren't thread-safe (they rely on the GIL to avoid
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13 the expense of doing their own locking).
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14 -------------------------------------------------------------------------- */
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15
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16 #ifdef HAVE_DLOPEN
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17 #ifdef HAVE_DLFCN_H
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18 #include <dlfcn.h>
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19 #endif
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20 #ifndef RTLD_LAZY
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21 #define RTLD_LAZY 1
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22 #endif
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23 #endif
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26 #ifdef WITH_THREAD
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27 #include "pythread.h"
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28 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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29 #define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
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30 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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31 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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33 #ifdef __cplusplus
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34 extern "C" {
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35 #endif
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36
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37 /* The single PyInterpreterState used by this process'
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38 GILState implementation
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39 */
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40 static PyInterpreterState *autoInterpreterState = NULL;
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41 static int autoTLSkey = 0;
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42 #else
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43 #define HEAD_INIT() /* Nothing */
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44 #define HEAD_LOCK() /* Nothing */
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45 #define HEAD_UNLOCK() /* Nothing */
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46 #endif
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47
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48 static PyInterpreterState *interp_head = NULL;
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49
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50 PyThreadState *_PyThreadState_Current = NULL;
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51 PyThreadFrameGetter _PyThreadState_GetFrame = NULL;
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52
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53 #ifdef WITH_THREAD
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54 static void _PyGILState_NoteThreadState(PyThreadState* tstate);
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55 #endif
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57
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58 PyInterpreterState *
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59 PyInterpreterState_New(void)
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60 {
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61 PyInterpreterState *interp = (PyInterpreterState *)
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62 malloc(sizeof(PyInterpreterState));
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63
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64 if (interp != NULL) {
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65 HEAD_INIT();
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66 #ifdef WITH_THREAD
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67 if (head_mutex == NULL)
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68 Py_FatalError("Can't initialize threads for interpreter");
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69 #endif
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70 interp->modules = NULL;
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71 interp->modules_reloading = NULL;
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72 interp->modules_by_index = NULL;
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73 interp->sysdict = NULL;
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74 interp->builtins = NULL;
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75 interp->tstate_head = NULL;
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76 interp->codec_search_path = NULL;
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77 interp->codec_search_cache = NULL;
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78 interp->codec_error_registry = NULL;
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79 interp->codecs_initialized = 0;
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80 #ifdef HAVE_DLOPEN
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81 #ifdef RTLD_NOW
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82 interp->dlopenflags = RTLD_NOW;
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83 #else
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84 interp->dlopenflags = RTLD_LAZY;
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85 #endif
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86 #endif
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87 #ifdef WITH_TSC
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88 interp->tscdump = 0;
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89 #endif
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90
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91 HEAD_LOCK();
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92 interp->next = interp_head;
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93 interp_head = interp;
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94 HEAD_UNLOCK();
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95 }
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96
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97 return interp;
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98 }
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99
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100
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101 void
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102 PyInterpreterState_Clear(PyInterpreterState *interp)
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103 {
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104 PyThreadState *p;
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105 HEAD_LOCK();
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106 for (p = interp->tstate_head; p != NULL; p = p->next)
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107 PyThreadState_Clear(p);
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108 HEAD_UNLOCK();
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109 Py_CLEAR(interp->codec_search_path);
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110 Py_CLEAR(interp->codec_search_cache);
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111 Py_CLEAR(interp->codec_error_registry);
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112 Py_CLEAR(interp->modules);
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113 Py_CLEAR(interp->modules_by_index);
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114 Py_CLEAR(interp->modules_reloading);
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115 Py_CLEAR(interp->sysdict);
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116 Py_CLEAR(interp->builtins);
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117 }
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118
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119
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120 static void
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121 zapthreads(PyInterpreterState *interp)
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122 {
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123 PyThreadState *p;
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124 /* No need to lock the mutex here because this should only happen
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125 when the threads are all really dead (XXX famous last words). */
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126 while ((p = interp->tstate_head) != NULL) {
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127 PyThreadState_Delete(p);
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128 }
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129 }
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130
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131
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132 void
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133 PyInterpreterState_Delete(PyInterpreterState *interp)
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134 {
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135 PyInterpreterState **p;
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136 zapthreads(interp);
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137 HEAD_LOCK();
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138 for (p = &interp_head; ; p = &(*p)->next) {
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139 if (*p == NULL)
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140 Py_FatalError(
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141 "PyInterpreterState_Delete: invalid interp");
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142 if (*p == interp)
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143 break;
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144 }
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145 if (interp->tstate_head != NULL)
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146 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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147 *p = interp->next;
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148 HEAD_UNLOCK();
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149 free(interp);
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150 }
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151
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152
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153 /* Default implementation for _PyThreadState_GetFrame */
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154 static struct _frame *
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155 threadstate_getframe(PyThreadState *self)
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156 {
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157 return self->frame;
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158 }
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159
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160 static PyThreadState *
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161 new_threadstate(PyInterpreterState *interp, int init)
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162 {
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163 PyThreadState *tstate = (PyThreadState *)malloc(sizeof(PyThreadState));
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164
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165 if (_PyThreadState_GetFrame == NULL)
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166 _PyThreadState_GetFrame = threadstate_getframe;
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167
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168 if (tstate != NULL) {
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169 tstate->interp = interp;
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170
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171 tstate->frame = NULL;
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172 tstate->recursion_depth = 0;
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173 tstate->overflowed = 0;
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174 tstate->recursion_critical = 0;
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175 tstate->tracing = 0;
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176 tstate->use_tracing = 0;
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177 tstate->tick_counter = 0;
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178 tstate->gilstate_counter = 0;
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179 tstate->async_exc = NULL;
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180 #ifdef WITH_THREAD
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181 tstate->thread_id = PyThread_get_thread_ident();
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182 #else
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183 tstate->thread_id = 0;
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184 #endif
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185
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186 tstate->dict = NULL;
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187
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188 tstate->curexc_type = NULL;
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189 tstate->curexc_value = NULL;
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190 tstate->curexc_traceback = NULL;
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191
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192 tstate->exc_type = NULL;
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193 tstate->exc_value = NULL;
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194 tstate->exc_traceback = NULL;
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195
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196 tstate->c_profilefunc = NULL;
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197 tstate->c_tracefunc = NULL;
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198 tstate->c_profileobj = NULL;
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199 tstate->c_traceobj = NULL;
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200
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201 if (init)
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202 _PyThreadState_Init(tstate);
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203
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204 HEAD_LOCK();
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205 tstate->next = interp->tstate_head;
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206 interp->tstate_head = tstate;
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207 HEAD_UNLOCK();
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208 }
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209
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210 return tstate;
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211 }
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212
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213 PyThreadState *
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214 PyThreadState_New(PyInterpreterState *interp)
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215 {
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216 return new_threadstate(interp, 1);
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217 }
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218
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219 PyThreadState *
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220 _PyThreadState_Prealloc(PyInterpreterState *interp)
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221 {
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222 return new_threadstate(interp, 0);
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223 }
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224
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225 void
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226 _PyThreadState_Init(PyThreadState *tstate)
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227 {
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228 #ifdef WITH_THREAD
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229 _PyGILState_NoteThreadState(tstate);
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230 #endif
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231 }
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232
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233 PyObject*
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234 PyState_FindModule(struct PyModuleDef* m)
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235 {
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236 Py_ssize_t index = m->m_base.m_index;
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237 PyInterpreterState *state = PyThreadState_GET()->interp;
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238 PyObject *res;
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239 if (index == 0)
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240 return NULL;
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241 if (state->modules_by_index == NULL)
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242 return NULL;
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243 if (index > PyList_GET_SIZE(state->modules_by_index))
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244 return NULL;
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245 res = PyList_GET_ITEM(state->modules_by_index, index);
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246 return res==Py_None ? NULL : res;
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247 }
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248
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249 int
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250 _PyState_AddModule(PyObject* module, struct PyModuleDef* def)
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251 {
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252 PyInterpreterState *state = PyThreadState_GET()->interp;
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253 if (!def)
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254 return -1;
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255 if (!state->modules_by_index) {
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256 state->modules_by_index = PyList_New(0);
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257 if (!state->modules_by_index)
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258 return -1;
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259 }
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260 while(PyList_GET_SIZE(state->modules_by_index) <= def->m_base.m_index)
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261 if (PyList_Append(state->modules_by_index, Py_None) < 0)
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262 return -1;
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263 Py_INCREF(module);
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264 return PyList_SetItem(state->modules_by_index,
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265 def->m_base.m_index, module);
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266 }
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267
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268 void
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269 PyThreadState_Clear(PyThreadState *tstate)
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270 {
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271 if (Py_VerboseFlag && tstate->frame != NULL)
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272 fprintf(stderr,
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273 "PyThreadState_Clear: warning: thread still has a frame\n");
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274
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275 Py_CLEAR(tstate->frame);
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276
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277 Py_CLEAR(tstate->dict);
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278 Py_CLEAR(tstate->async_exc);
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279
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280 Py_CLEAR(tstate->curexc_type);
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281 Py_CLEAR(tstate->curexc_value);
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282 Py_CLEAR(tstate->curexc_traceback);
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283
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284 Py_CLEAR(tstate->exc_type);
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285 Py_CLEAR(tstate->exc_value);
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286 Py_CLEAR(tstate->exc_traceback);
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287
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288 tstate->c_profilefunc = NULL;
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289 tstate->c_tracefunc = NULL;
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290 Py_CLEAR(tstate->c_profileobj);
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291 Py_CLEAR(tstate->c_traceobj);
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292 }
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293
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294
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295 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
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296 static void
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297 tstate_delete_common(PyThreadState *tstate)
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298 {
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299 PyInterpreterState *interp;
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300 PyThreadState **p;
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301 PyThreadState *prev_p = NULL;
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302 if (tstate == NULL)
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303 Py_FatalError("PyThreadState_Delete: NULL tstate");
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304 interp = tstate->interp;
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305 if (interp == NULL)
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306 Py_FatalError("PyThreadState_Delete: NULL interp");
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307 HEAD_LOCK();
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308 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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309 if (*p == NULL)
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310 Py_FatalError(
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311 "PyThreadState_Delete: invalid tstate");
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312 if (*p == tstate)
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313 break;
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314 /* Sanity check. These states should never happen but if
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315 * they do we must abort. Otherwise we'll end up spinning in
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316 * in a tight loop with the lock held. A similar check is done
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317 * in thread.c find_key(). */
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318 if (*p == prev_p)
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319 Py_FatalError(
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320 "PyThreadState_Delete: small circular list(!)"
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321 " and tstate not found.");
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322 prev_p = *p;
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323 if ((*p)->next == interp->tstate_head)
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324 Py_FatalError(
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325 "PyThreadState_Delete: circular list(!) and"
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326 " tstate not found.");
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327 }
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328 *p = tstate->next;
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329 HEAD_UNLOCK();
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330 free(tstate);
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331 }
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332
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333
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334 void
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335 PyThreadState_Delete(PyThreadState *tstate)
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336 {
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337 if (tstate == _PyThreadState_Current)
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338 Py_FatalError("PyThreadState_Delete: tstate is still current");
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339 tstate_delete_common(tstate);
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340 #ifdef WITH_THREAD
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341 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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342 PyThread_delete_key_value(autoTLSkey);
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343 #endif /* WITH_THREAD */
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344 }
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345
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346
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347 #ifdef WITH_THREAD
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348 void
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349 PyThreadState_DeleteCurrent()
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350 {
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351 PyThreadState *tstate = _PyThreadState_Current;
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352 if (tstate == NULL)
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353 Py_FatalError(
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354 "PyThreadState_DeleteCurrent: no current tstate");
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355 _PyThreadState_Current = NULL;
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356 tstate_delete_common(tstate);
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357 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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358 PyThread_delete_key_value(autoTLSkey);
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359 PyEval_ReleaseLock();
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360 }
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361 #endif /* WITH_THREAD */
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362
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363
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364 PyThreadState *
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365 PyThreadState_Get(void)
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366 {
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367 if (_PyThreadState_Current == NULL)
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368 Py_FatalError("PyThreadState_Get: no current thread");
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369
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370 return _PyThreadState_Current;
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371 }
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372
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373
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374 PyThreadState *
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375 PyThreadState_Swap(PyThreadState *newts)
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376 {
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377 PyThreadState *oldts = _PyThreadState_Current;
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378
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379 _PyThreadState_Current = newts;
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380 /* It should not be possible for more than one thread state
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381 to be used for a thread. Check this the best we can in debug
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382 builds.
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383 */
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384 #if defined(Py_DEBUG) && defined(WITH_THREAD)
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385 if (newts) {
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386 /* This can be called from PyEval_RestoreThread(). Similar
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387 to it, we need to ensure errno doesn't change.
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388 */
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389 int err = errno;
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390 PyThreadState *check = PyGILState_GetThisThreadState();
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391 if (check && check->interp == newts->interp && check != newts)
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392 Py_FatalError("Invalid thread state for this thread");
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393 errno = err;
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394 }
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395 #endif
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396 return oldts;
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397 }
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398
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399 /* An extension mechanism to store arbitrary additional per-thread state.
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400 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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401 state; the caller should pick a unique key and store its state there. If
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402 PyThreadState_GetDict() returns NULL, an exception has *not* been raised
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403 and the caller should assume no per-thread state is available. */
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404
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405 PyObject *
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406 PyThreadState_GetDict(void)
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407 {
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408 if (_PyThreadState_Current == NULL)
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409 return NULL;
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410
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411 if (_PyThreadState_Current->dict == NULL) {
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412 PyObject *d;
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413 _PyThreadState_Current->dict = d = PyDict_New();
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414 if (d == NULL)
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415 PyErr_Clear();
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416 }
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417 return _PyThreadState_Current->dict;
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418 }
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419
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420
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421 /* Asynchronously raise an exception in a thread.
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422 Requested by Just van Rossum and Alex Martelli.
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423 To prevent naive misuse, you must write your own extension
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424 to call this, or use ctypes. Must be called with the GIL held.
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425 Returns the number of tstates modified (normally 1, but 0 if `id` didn't
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426 match any known thread id). Can be called with exc=NULL to clear an
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427 existing async exception. This raises no exceptions. */
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428
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429 int
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430 PyThreadState_SetAsyncExc(long id, PyObject *exc) {
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431 PyThreadState *tstate = PyThreadState_GET();
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432 PyInterpreterState *interp = tstate->interp;
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433 PyThreadState *p;
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434
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435 /* Although the GIL is held, a few C API functions can be called
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436 * without the GIL held, and in particular some that create and
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437 * destroy thread and interpreter states. Those can mutate the
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438 * list of thread states we're traversing, so to prevent that we lock
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439 * head_mutex for the duration.
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440 */
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441 HEAD_LOCK();
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442 for (p = interp->tstate_head; p != NULL; p = p->next) {
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443 if (p->thread_id == id) {
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444 /* Tricky: we need to decref the current value
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445 * (if any) in p->async_exc, but that can in turn
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446 * allow arbitrary Python code to run, including
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447 * perhaps calls to this function. To prevent
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448 * deadlock, we need to release head_mutex before
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449 * the decref.
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450 */
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451 PyObject *old_exc = p->async_exc;
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452 Py_XINCREF(exc);
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453 p->async_exc = exc;
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454 HEAD_UNLOCK();
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455 Py_XDECREF(old_exc);
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456 _PyEval_SignalAsyncExc();
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457 return 1;
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458 }
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459 }
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460 HEAD_UNLOCK();
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461 return 0;
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462 }
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463
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464
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465 /* Routines for advanced debuggers, requested by David Beazley.
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466 Don't use unless you know what you are doing! */
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467
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468 PyInterpreterState *
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469 PyInterpreterState_Head(void)
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470 {
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471 return interp_head;
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472 }
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473
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474 PyInterpreterState *
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475 PyInterpreterState_Next(PyInterpreterState *interp) {
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476 return interp->next;
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477 }
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478
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479 PyThreadState *
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480 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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481 return interp->tstate_head;
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482 }
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483
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484 PyThreadState *
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485 PyThreadState_Next(PyThreadState *tstate) {
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486 return tstate->next;
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487 }
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488
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489 /* The implementation of sys._current_frames(). This is intended to be
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490 called with the GIL held, as it will be when called via
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491 sys._current_frames(). It's possible it would work fine even without
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492 the GIL held, but haven't thought enough about that.
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493 */
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494 PyObject *
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495 _PyThread_CurrentFrames(void)
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496 {
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497 PyObject *result;
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498 PyInterpreterState *i;
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499
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500 result = PyDict_New();
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501 if (result == NULL)
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502 return NULL;
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503
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504 /* for i in all interpreters:
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505 * for t in all of i's thread states:
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506 * if t's frame isn't NULL, map t's id to its frame
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507 * Because these lists can mutute even when the GIL is held, we
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508 * need to grab head_mutex for the duration.
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509 */
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510 HEAD_LOCK();
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511 for (i = interp_head; i != NULL; i = i->next) {
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512 PyThreadState *t;
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513 for (t = i->tstate_head; t != NULL; t = t->next) {
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514 PyObject *id;
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515 int stat;
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516 struct _frame *frame = t->frame;
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Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
517 if (frame == NULL)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
518 continue;
44099
f324631462a2 Cleanup: Replaced most PyInt_ aliases with PyLong_ and disabled the aliases in intobject.h
Christian Heimes <christian@cheimes.de>
parents: 42013
diff changeset
519 id = PyLong_FromLong(t->thread_id);
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
520 if (id == NULL)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
521 goto Fail;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
522 stat = PyDict_SetItem(result, id, (PyObject *)frame);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
523 Py_DECREF(id);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
524 if (stat < 0)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
525 goto Fail;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
526 }
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
527 }
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
528 HEAD_UNLOCK();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
529 return result;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
530
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
531 Fail:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
532 HEAD_UNLOCK();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
533 Py_DECREF(result);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
534 return NULL;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
535 }
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
536
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
537 /* Python "auto thread state" API. */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
538 #ifdef WITH_THREAD
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
539
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
540 /* Keep this as a static, as it is not reliable! It can only
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
541 ever be compared to the state for the *current* thread.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
542 * If not equal, then it doesn't matter that the actual
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
543 value may change immediately after comparison, as it can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
544 possibly change to the current thread's state.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
545 * If equal, then the current thread holds the lock, so the value can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
546 change until we yield the lock.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
547 */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
548 static int
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
549 PyThreadState_IsCurrent(PyThreadState *tstate)
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
550 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
551 /* Must be the tstate for this thread */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
552 assert(PyGILState_GetThisThreadState()==tstate);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
553 /* On Windows at least, simple reads and writes to 32 bit values
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
554 are atomic.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
555 */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
556 return tstate == _PyThreadState_Current;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
557 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
558
33698
090ffcb83f0a Trim trailing whitespace.
Tim Peters <tim.peters@gmail.com>
parents: 32301
diff changeset
559 /* Internal initialization/finalization functions called by
090ffcb83f0a Trim trailing whitespace.
Tim Peters <tim.peters@gmail.com>
parents: 32301
diff changeset
560 Py_Initialize/Py_Finalize
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
561 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
562 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
563 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
564 {
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
565 assert(i && t); /* must init with valid states */
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
566 autoTLSkey = PyThread_create_key();
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
567 autoInterpreterState = i;
33706
4981ba54f43d _PyGILState_Init(), PyGILState_Ensure(): Since PyThread_set_key_value()
Tim Peters <tim.peters@gmail.com>
parents: 33699
diff changeset
568 assert(PyThread_get_key_value(autoTLSkey) == NULL);
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
569 assert(t->gilstate_counter == 0);
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
570
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
571 _PyGILState_NoteThreadState(t);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
572 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
573
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
574 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
575 _PyGILState_Fini(void)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
576 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
577 PyThread_delete_key(autoTLSkey);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
578 autoTLSkey = 0;
40450
cc992d75d5b3 Four months of trunk changes (including a few releases...)
Thomas Wouters <thomas@python.org>
parents: 39610
diff changeset
579 autoInterpreterState = NULL;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
580 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
581
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
582 /* When a thread state is created for a thread by some mechanism other than
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
583 PyGILState_Ensure, it's important that the GILState machinery knows about
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
584 it so it doesn't try to create another thread state for the thread (this is
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
585 a better fix for SF bug #1010677 than the first one attempted).
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
586 */
40450
cc992d75d5b3 Four months of trunk changes (including a few releases...)
Thomas Wouters <thomas@python.org>
parents: 39610
diff changeset
587 static void
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
588 _PyGILState_NoteThreadState(PyThreadState* tstate)
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
589 {
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
590 /* If autoTLSkey is 0, this must be the very first threadstate created
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
591 in Py_Initialize(). Don't do anything for now (we'll be back here
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
592 when _PyGILState_Init is called). */
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
593 if (!autoTLSkey)
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
594 return;
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
595
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
596 /* Stick the thread state for this thread in thread local storage.
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
597
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
598 The only situation where you can legitimately have more than one
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
599 thread state for an OS level thread is when there are multiple
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
600 interpreters, when:
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
601
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
602 a) You shouldn't really be using the PyGILState_ APIs anyway,
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
603 and:
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
604
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
605 b) The slightly odd way PyThread_set_key_value works (see
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
606 comments by its implementation) means that the first thread
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
607 state created for that given OS level thread will "win",
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
608 which seems reasonable behaviour.
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
609 */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
610 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
611 Py_FatalError("Couldn't create autoTLSkey mapping");
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
612
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
613 /* PyGILState_Release must not try to delete this thread state. */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
614 tstate->gilstate_counter = 1;
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
615 }
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
616
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
617 /* The public functions */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
618 PyThreadState *
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
619 PyGILState_GetThisThreadState(void)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
620 {
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
621 if (autoInterpreterState == NULL || autoTLSkey == 0)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
622 return NULL;
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
623 return (PyThreadState *)PyThread_get_key_value(autoTLSkey);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
624 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
625
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
626 PyGILState_STATE
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
627 PyGILState_Ensure(void)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
628 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
629 int current;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
630 PyThreadState *tcur;
33698
090ffcb83f0a Trim trailing whitespace.
Tim Peters <tim.peters@gmail.com>
parents: 32301
diff changeset
631 /* Note that we do not auto-init Python here - apart from
090ffcb83f0a Trim trailing whitespace.
Tim Peters <tim.peters@gmail.com>
parents: 32301
diff changeset
632 potential races with 2 threads auto-initializing, pep-311
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
633 spells out other issues. Embedders are expected to have
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
634 called Py_Initialize() and usually PyEval_InitThreads().
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
635 */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
636 assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
37879
f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 36683
diff changeset
637 tcur = (PyThreadState *)PyThread_get_key_value(autoTLSkey);
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
638 if (tcur == NULL) {
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
639 /* Create a new thread state for this thread */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
640 tcur = PyThreadState_New(autoInterpreterState);
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
641 if (tcur == NULL)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
642 Py_FatalError("Couldn't create thread-state for new thread");
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
643 /* This is our thread state! We'll need to delete it in the
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
644 matching call to PyGILState_Release(). */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
645 tcur->gilstate_counter = 0;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
646 current = 0; /* new thread state is never current */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
647 }
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
648 else
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
649 current = PyThreadState_IsCurrent(tcur);
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
650 if (current == 0)
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
651 PyEval_RestoreThread(tcur);
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652 /* Update our counter in the thread-state - no need for locks:
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653 - tcur will remain valid as we hold the GIL.
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654 - the counter is safe as we are the only thread "allowed"
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655 to modify this value
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656 */
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657 ++tcur->gilstate_counter;
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658 return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
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659 }
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660
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661 void
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662 PyGILState_Release(PyGILState_STATE oldstate)
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663 {
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664 PyThreadState *tcur = (PyThreadState *)PyThread_get_key_value(
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665 autoTLSkey);
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666 if (tcur == NULL)
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667 Py_FatalError("auto-releasing thread-state, "
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668 "but no thread-state for this thread");
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669 /* We must hold the GIL and have our thread state current */
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670 /* XXX - remove the check - the assert should be fine,
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671 but while this is very new (April 2003), the extra check
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672 by release-only users can't hurt.
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673 */
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674 if (! PyThreadState_IsCurrent(tcur))
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675 Py_FatalError("This thread state must be current when releasing");
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676 assert(PyThreadState_IsCurrent(tcur));
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677 --tcur->gilstate_counter;
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678 assert(tcur->gilstate_counter >= 0); /* illegal counter value */
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679
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680 /* If we're going to destroy this thread-state, we must
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681 * clear it while the GIL is held, as destructors may run.
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682 */
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683 if (tcur->gilstate_counter == 0) {
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684 /* can't have been locked when we created it */
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685 assert(oldstate == PyGILState_UNLOCKED);
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686 PyThreadState_Clear(tcur);
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687 /* Delete the thread-state. Note this releases the GIL too!
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688 * It's vital that the GIL be held here, to avoid shutdown
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689 * races; see bugs 225673 and 1061968 (that nasty bug has a
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690 * habit of coming back).
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691 */
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692 PyThreadState_DeleteCurrent();
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693 }
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694 /* Release the lock if necessary */
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695 else if (oldstate == PyGILState_UNLOCKED)
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696 PyEval_SaveThread();
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697 }
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698
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699 #ifdef __cplusplus
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700 }
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701 #endif
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702
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703 #endif /* WITH_THREAD */
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704
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705