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annotate Python/pystate.c @ 49613:efef5fc45a9a

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Issue 3723: Fixed initialization of subinterpreters The patch fixes several issues with Py_NewInterpreter as well as the demo for multiple subinterpreters. Most of the patch was written by MvL with help from Benjamin, Amaury and me. Graham Dumpleton has verified that this patch fixes an issue with mod_wsgi.
author Christian Heimes <christian@cheimes.de>
date Thu, 30 Oct 2008 21:48:26 +0000
parents 7779af388aec
children 620a34dc10f9
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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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24
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25
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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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32
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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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f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
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133 PyInterpreterState_Delete(PyInterpreterState *interp)
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134 {
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diff changeset
135 PyInterpreterState **p;
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136 zapthreads(interp);
14378
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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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diff changeset
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;
14378
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diff changeset
148 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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diff changeset
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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diff changeset
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 PyThreadState *
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161 PyThreadState_New(PyInterpreterState *interp)
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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)
27978
4b99a701defe - PyEval_GetFrame() is now declared to return a PyFrameObject *
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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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cd125fe83051 Make identifiers str (not str8) objects throughout.
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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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Fred Drake <fdrake@acm.org>
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176 tstate->use_tracing = 0;
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177 tstate->tick_counter = 0;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
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178 tstate->gilstate_counter = 0;
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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179 tstate->async_exc = NULL;
29842
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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180 #ifdef WITH_THREAD
29643
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diff changeset
181 tstate->thread_id = PyThread_get_thread_ident();
29842
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
182 #else
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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diff changeset
183 tstate->thread_id = 0;
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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diff changeset
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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parents:
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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;
e427afb5637f Revise the interface to the profiling and tracing support for the
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197 tstate->c_tracefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
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198 tstate->c_profileobj = NULL;
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199 tstate->c_traceobj = NULL;
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200
35661
85651eb3d9a9 Forward port bugfix:
Michael W. Hudson <mwh@python.net>
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diff changeset
201 #ifdef WITH_THREAD
35117
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Michael W. Hudson <mwh@python.net>
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202 _PyGILState_NoteThreadState(tstate);
35661
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diff changeset
203 #endif
35117
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204
11011
3b3c7b8ade7f CRITICAL PATCH!
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205 HEAD_LOCK();
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206 tstate->next = interp->tstate_head;
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207 interp->tstate_head = tstate;
11011
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208 HEAD_UNLOCK();
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209 }
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210
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211 return tstate;
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212 }
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213
47580
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
214 PyObject*
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
215 PyState_FindModule(struct PyModuleDef* m)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
216 {
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
217 Py_ssize_t index = m->m_base.m_index;
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diff changeset
218 PyInterpreterState *state = PyThreadState_GET()->interp;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
219 PyObject *res;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
220 if (index == 0)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
221 return NULL;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
222 if (state->modules_by_index == NULL)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
223 return NULL;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
224 if (index > PyList_GET_SIZE(state->modules_by_index))
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
225 return NULL;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
226 res = PyList_GET_ITEM(state->modules_by_index, index);
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
227 return res==Py_None ? NULL : res;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
228 }
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
229
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
230 int
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
231 _PyState_AddModule(PyObject* module, struct PyModuleDef* def)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
232 {
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
233 PyInterpreterState *state = PyThreadState_GET()->interp;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
234 if (!def)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
235 return -1;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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parents: 44834
diff changeset
236 if (!state->modules_by_index) {
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
237 state->modules_by_index = PyList_New(20);
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
238 if (!state->modules_by_index)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
239 return -1;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
240 }
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
241 while(PyList_GET_SIZE(state->modules_by_index) <= def->m_base.m_index)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
242 if (PyList_Append(state->modules_by_index, Py_None) < 0)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
243 return -1;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
244 Py_INCREF(module);
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
245 return PyList_SetItem(state->modules_by_index,
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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diff changeset
246 def->m_base.m_index, module);
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
247 }
5405
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diff changeset
248
5926
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diff changeset
249 void
13658
f79434ee41fa Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
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diff changeset
250 PyThreadState_Clear(PyThreadState *tstate)
5926
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diff changeset
251 {
6549
a8e3b2e9f5d2 The warning about thread still having a frame now only happens in
Guido van Rossum <guido@python.org>
parents: 6124
diff changeset
252 if (Py_VerboseFlag && tstate->frame != NULL)
5926
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diff changeset
253 fprintf(stderr,
6124
cc2c84769636 Added missing newline to warning msg
Guido van Rossum <guido@python.org>
parents: 5926
diff changeset
254 "PyThreadState_Clear: warning: thread still has a frame\n");
5926
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diff changeset
255
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
256 Py_CLEAR(tstate->frame);
5926
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diff changeset
257
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
258 Py_CLEAR(tstate->dict);
f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 36683
diff changeset
259 Py_CLEAR(tstate->async_exc);
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
Guido van Rossum <guido@python.org>
parents: 6549
diff changeset
260
37879
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261 Py_CLEAR(tstate->curexc_type);
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262 Py_CLEAR(tstate->curexc_value);
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263 Py_CLEAR(tstate->curexc_traceback);
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264
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265 Py_CLEAR(tstate->exc_type);
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266 Py_CLEAR(tstate->exc_value);
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267 Py_CLEAR(tstate->exc_traceback);
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268
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269 tstate->c_profilefunc = NULL;
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270 tstate->c_tracefunc = NULL;
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271 Py_CLEAR(tstate->c_profileobj);
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272 Py_CLEAR(tstate->c_traceobj);
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273 }
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274
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275
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276 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
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277 static void
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278 tstate_delete_common(PyThreadState *tstate)
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279 {
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280 PyInterpreterState *interp;
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281 PyThreadState **p;
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282 PyThreadState *prev_p = NULL;
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283 if (tstate == NULL)
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284 Py_FatalError("PyThreadState_Delete: NULL tstate");
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285 interp = tstate->interp;
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286 if (interp == NULL)
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287 Py_FatalError("PyThreadState_Delete: NULL interp");
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288 HEAD_LOCK();
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289 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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290 if (*p == NULL)
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291 Py_FatalError(
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292 "PyThreadState_Delete: invalid tstate");
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293 if (*p == tstate)
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294 break;
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295 /* Sanity check. These states should never happen but if
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296 * they do we must abort. Otherwise we'll end up spinning in
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297 * in a tight loop with the lock held. A similar check is done
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298 * in thread.c find_key(). */
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299 if (*p == prev_p)
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300 Py_FatalError(
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301 "PyThreadState_Delete: small circular list(!)"
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302 " and tstate not found.");
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303 prev_p = *p;
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304 if ((*p)->next == interp->tstate_head)
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305 Py_FatalError(
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306 "PyThreadState_Delete: circular list(!) and"
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307 " tstate not found.");
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308 }
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309 *p = tstate->next;
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310 HEAD_UNLOCK();
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311 free(tstate);
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312 }
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313
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314
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315 void
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316 PyThreadState_Delete(PyThreadState *tstate)
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317 {
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318 if (tstate == _PyThreadState_Current)
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319 Py_FatalError("PyThreadState_Delete: tstate is still current");
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320 tstate_delete_common(tstate);
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321 #ifdef WITH_THREAD
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322 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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323 PyThread_delete_key_value(autoTLSkey);
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324 #endif /* WITH_THREAD */
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325 }
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326
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327
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328 #ifdef WITH_THREAD
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329 void
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330 PyThreadState_DeleteCurrent()
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331 {
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332 PyThreadState *tstate = _PyThreadState_Current;
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333 if (tstate == NULL)
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334 Py_FatalError(
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335 "PyThreadState_DeleteCurrent: no current tstate");
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336 _PyThreadState_Current = NULL;
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337 tstate_delete_common(tstate);
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338 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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339 PyThread_delete_key_value(autoTLSkey);
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340 PyEval_ReleaseLock();
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341 }
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342 #endif /* WITH_THREAD */
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343
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344
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345 PyThreadState *
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346 PyThreadState_Get(void)
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347 {
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348 if (_PyThreadState_Current == NULL)
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349 Py_FatalError("PyThreadState_Get: no current thread");
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350
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351 return _PyThreadState_Current;
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352 }
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353
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354
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355 PyThreadState *
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356 PyThreadState_Swap(PyThreadState *newts)
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357 {
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358 PyThreadState *oldts = _PyThreadState_Current;
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359
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360 _PyThreadState_Current = newts;
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361 /* It should not be possible for more than one thread state
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362 to be used for a thread. Check this the best we can in debug
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363 builds.
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364 */
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365 #if defined(Py_DEBUG) && defined(WITH_THREAD)
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366 if (newts) {
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367 /* This can be called from PyEval_RestoreThread(). Similar
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368 to it, we need to ensure errno doesn't change.
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369 */
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370 int err = errno;
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371 PyThreadState *check = PyGILState_GetThisThreadState();
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372 if (check && check->interp == newts->interp && check != newts)
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373 Py_FatalError("Invalid thread state for this thread");
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374 errno = err;
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375 }
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376 #endif
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377 return oldts;
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378 }
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379
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380 /* An extension mechanism to store arbitrary additional per-thread state.
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381 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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382 state; the caller should pick a unique key and store its state there. If
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383 PyThreadState_GetDict() returns NULL, an exception has *not* been raised
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384 and the caller should assume no per-thread state is available. */
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385
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386 PyObject *
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387 PyThreadState_GetDict(void)
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388 {
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389 if (_PyThreadState_Current == NULL)
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390 return NULL;
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Guido van Rossum <guido@python.org>
parents: 6549
diff changeset
391
28616
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
392 if (_PyThreadState_Current->dict == NULL) {
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
393 PyObject *d;
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
394 _PyThreadState_Current->dict = d = PyDict_New();
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
395 if (d == NULL)
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
396 PyErr_Clear();
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
397 }
9667
914f83e7fa0a Make current_tstate a global, _PyThreadState_Current. This is to
Guido van Rossum <guido@python.org>
parents: 7970
diff changeset
398 return _PyThreadState_Current->dict;
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
Guido van Rossum <guido@python.org>
parents: 6549
diff changeset
399 }
18733
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
400
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
401
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
402 /* Asynchronously raise an exception in a thread.
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
403 Requested by Just van Rossum and Alex Martelli.
34568
ff3ca656c281 Backport 2.39:
Guido van Rossum <guido@python.org>
parents: 33940
diff changeset
404 To prevent naive misuse, you must write your own extension
39610
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
405 to call this, or use ctypes. Must be called with the GIL held.
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
406 Returns the number of tstates modified (normally 1, but 0 if `id` didn't
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
407 match any known thread id). Can be called with exc=NULL to clear an
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
408 existing async exception. This raises no exceptions. */
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
409
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
410 int
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
411 PyThreadState_SetAsyncExc(long id, PyObject *exc) {
31797
846b3ee7e106 Changed random calls to PyThreadState_Get() to use the macro
Nicholas Bastin <nick.bastin@gmail.com>
parents: 29842
diff changeset
412 PyThreadState *tstate = PyThreadState_GET();
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
413 PyInterpreterState *interp = tstate->interp;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
414 PyThreadState *p;
39610
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
415
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
416 /* Although the GIL is held, a few C API functions can be called
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
417 * without the GIL held, and in particular some that create and
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
418 * destroy thread and interpreter states. Those can mutate the
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
419 * list of thread states we're traversing, so to prevent that we lock
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
420 * head_mutex for the duration.
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
421 */
34568
ff3ca656c281 Backport 2.39:
Guido van Rossum <guido@python.org>
parents: 33940
diff changeset
422 HEAD_LOCK();
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
423 for (p = interp->tstate_head; p != NULL; p = p->next) {
39610
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
424 if (p->thread_id == id) {
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
425 /* Tricky: we need to decref the current value
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
426 * (if any) in p->async_exc, but that can in turn
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
427 * allow arbitrary Python code to run, including
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
428 * perhaps calls to this function. To prevent
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
429 * deadlock, we need to release head_mutex before
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
430 * the decref.
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
431 */
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
432 PyObject *old_exc = p->async_exc;
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
433 Py_XINCREF(exc);
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
434 p->async_exc = exc;
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
435 HEAD_UNLOCK();
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
436 Py_XDECREF(old_exc);
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
437 return 1;
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
438 }
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
439 }
34568
ff3ca656c281 Backport 2.39:
Guido van Rossum <guido@python.org>
parents: 33940
diff changeset
440 HEAD_UNLOCK();
39610
3674f20ac781 Merge current trunk into p3yk. This includes the PyNumber_Index API change,
Thomas Wouters <thomas@python.org>
parents: 39442
diff changeset
441 return 0;
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
442 }
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
443
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
444
18733
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
445 /* Routines for advanced debuggers, requested by David Beazley.
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
446 Don't use unless you know what you are doing! */
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
447
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
448 PyInterpreterState *
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
449 PyInterpreterState_Head(void)
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
450 {
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
451 return interp_head;
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
452 }
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
453
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
454 PyInterpreterState *
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
455 PyInterpreterState_Next(PyInterpreterState *interp) {
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
456 return interp->next;
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
457 }
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
458
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
459 PyThreadState *
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
460 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
461 return interp->tstate_head;
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
462 }
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
463
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
464 PyThreadState *
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
465 PyThreadState_Next(PyThreadState *tstate) {
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
466 return tstate->next;
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
Guido van Rossum <guido@python.org>
parents: 18689
diff changeset
467 }
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
468
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
469 /* The implementation of sys._current_frames(). This is intended to be
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
470 called with the GIL held, as it will be when called via
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
471 sys._current_frames(). It's possible it would work fine even without
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
472 the GIL held, but haven't thought enough about that.
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
473 */
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
474 PyObject *
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
475 _PyThread_CurrentFrames(void)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
476 {
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
477 PyObject *result;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
478 PyInterpreterState *i;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
479
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
480 result = PyDict_New();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
481 if (result == NULL)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
482 return NULL;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
483
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
484 /* for i in all interpreters:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
485 * for t in all of i's thread states:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
486 * if t's frame isn't NULL, map t's id to its frame
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
487 * Because these lists can mutute even when the GIL is held, we
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
488 * need to grab head_mutex for the duration.
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
489 */
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
490 HEAD_LOCK();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
491 for (i = interp_head; i != NULL; i = i->next) {
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
492 PyThreadState *t;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
493 for (t = i->tstate_head; t != NULL; t = t->next) {
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
494 PyObject *id;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
495 int stat;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
496 struct _frame *frame = t->frame;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
497 if (frame == NULL)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
498 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
499 id = PyLong_FromLong(t->thread_id);
39442
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
500 if (id == NULL)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
501 goto Fail;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
502 stat = PyDict_SetItem(result, id, (PyObject *)frame);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
503 Py_DECREF(id);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
504 if (stat < 0)
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
505 goto Fail;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
506 }
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
507 }
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
508 HEAD_UNLOCK();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
509 return result;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
510
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
511 Fail:
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
512 HEAD_UNLOCK();
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
513 Py_DECREF(result);
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
514 return NULL;
654c380cf8b9 Merged revisions 46753-51188 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 37879
diff changeset
515 }
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
parents: 28914
diff changeset
516
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
517 /* 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
518 #ifdef WITH_THREAD
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
519
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
520 /* 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
521 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
522 * If not equal, then it doesn't matter that the actual
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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523 value may change immediately after comparison, as it can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
524 possibly change to the current thread's state.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
525 * If equal, then the current thread holds the lock, so the value can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
526 change until we yield the lock.
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diff changeset
527 */
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diff changeset
528 static int
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
529 PyThreadState_IsCurrent(PyThreadState *tstate)
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diff changeset
530 {
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diff changeset
531 /* Must be the tstate for this thread */
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diff changeset
532 assert(PyGILState_GetThisThreadState()==tstate);
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533 /* On Windows at least, simple reads and writes to 32 bit values
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
534 are atomic.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
535 */
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diff changeset
536 return tstate == _PyThreadState_Current;
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537 }
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diff changeset
538
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539 /* Internal initialization/finalization functions called by
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diff changeset
540 Py_Initialize/Py_Finalize
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
541 */
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542 void
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543 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
28694
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544 {
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diff changeset
545 assert(i && t); /* must init with valid states */
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diff changeset
546 autoTLSkey = PyThread_create_key();
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diff changeset
547 autoInterpreterState = i;
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4981ba54f43d _PyGILState_Init(), PyGILState_Ensure(): Since PyThread_set_key_value()
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548 assert(PyThread_get_key_value(autoTLSkey) == NULL);
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549 assert(t->gilstate_counter == 0);
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550
7ea2be2c0e1d Fix bug:
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551 _PyGILState_NoteThreadState(t);
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552 }
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553
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554 void
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555 _PyGILState_Fini(void)
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556 {
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diff changeset
557 PyThread_delete_key(autoTLSkey);
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558 autoTLSkey = 0;
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559 autoInterpreterState = NULL;
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560 }
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561
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562 /* When a thread state is created for a thread by some mechanism other than
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563 PyGILState_Ensure, it's important that the GILState machinery knows about
7ea2be2c0e1d Fix bug:
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564 it so it doesn't try to create another thread state for the thread (this is
7ea2be2c0e1d Fix bug:
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diff changeset
565 a better fix for SF bug #1010677 than the first one attempted).
7ea2be2c0e1d Fix bug:
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diff changeset
566 */
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567 static void
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568 _PyGILState_NoteThreadState(PyThreadState* tstate)
7ea2be2c0e1d Fix bug:
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569 {
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570 /* If autoTLSkey is 0, this must be the very first threadstate created
7ea2be2c0e1d Fix bug:
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571 in Py_Initialize(). Don't do anything for now (we'll be back here
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572 when _PyGILState_Init is called). */
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573 if (!autoTLSkey)
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574 return;
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575
35117
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diff changeset
576 /* Stick the thread state for this thread in thread local storage.
7ea2be2c0e1d Fix bug:
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diff changeset
577
7ea2be2c0e1d Fix bug:
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diff changeset
578 The only situation where you can legitimately have more than one
7ea2be2c0e1d Fix bug:
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diff changeset
579 thread state for an OS level thread is when there are multiple
7ea2be2c0e1d Fix bug:
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580 interpreters, when:
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581
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diff changeset
582 a) You shouldn't really be using the PyGILState_ APIs anyway,
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diff changeset
583 and:
7ea2be2c0e1d Fix bug:
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diff changeset
584
7ea2be2c0e1d Fix bug:
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diff changeset
585 b) The slightly odd way PyThread_set_key_value works (see
7ea2be2c0e1d Fix bug:
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diff changeset
586 comments by its implementation) means that the first thread
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diff changeset
587 state created for that given OS level thread will "win",
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diff changeset
588 which seems reasonable behaviour.
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diff changeset
589 */
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590 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
7ea2be2c0e1d Fix bug:
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591 Py_FatalError("Couldn't create autoTLSkey mapping");
7ea2be2c0e1d Fix bug:
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592
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diff changeset
593 /* PyGILState_Release must not try to delete this thread state. */
7ea2be2c0e1d Fix bug:
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diff changeset
594 tstate->gilstate_counter = 1;
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595 }
7ea2be2c0e1d Fix bug:
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diff changeset
596
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597 /* The public functions */
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598 PyThreadState *
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599 PyGILState_GetThisThreadState(void)
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600 {
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601 if (autoInterpreterState == NULL || autoTLSkey == 0)
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602 return NULL;
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603 return (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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604 }
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diff changeset
605
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606 PyGILState_STATE
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607 PyGILState_Ensure(void)
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diff changeset
608 {
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diff changeset
609 int current;
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diff changeset
610 PyThreadState *tcur;
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611 /* Note that we do not auto-init Python here - apart from
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612 potential races with 2 threads auto-initializing, pep-311
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613 spells out other issues. Embedders are expected to have
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614 called Py_Initialize() and usually PyEval_InitThreads().
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diff changeset
615 */
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616 assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
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617 tcur = (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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618 if (tcur == NULL) {
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diff changeset
619 /* Create a new thread state for this thread */
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620 tcur = PyThreadState_New(autoInterpreterState);
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621 if (tcur == NULL)
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622 Py_FatalError("Couldn't create thread-state for new thread");
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623 /* This is our thread state! We'll need to delete it in the
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624 matching call to PyGILState_Release(). */
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625 tcur->gilstate_counter = 0;
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626 current = 0; /* new thread state is never current */
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627 }
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628 else
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629 current = PyThreadState_IsCurrent(tcur);
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630 if (current == 0)
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631 PyEval_RestoreThread(tcur);
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diff changeset
632 /* Update our counter in the thread-state - no need for locks:
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633 - tcur will remain valid as we hold the GIL.
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634 - the counter is safe as we are the only thread "allowed"
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diff changeset
635 to modify this value
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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636 */
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637 ++tcur->gilstate_counter;
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638 return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
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639 }
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640
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641 void
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diff changeset
642 PyGILState_Release(PyGILState_STATE oldstate)
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643 {
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644 PyThreadState *tcur = (PyThreadState *)PyThread_get_key_value(
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645 autoTLSkey);
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646 if (tcur == NULL)
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647 Py_FatalError("auto-releasing thread-state, "
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648 "but no thread-state for this thread");
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649 /* We must hold the GIL and have our thread state current */
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650 /* XXX - remove the check - the assert should be fine,
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651 but while this is very new (April 2003), the extra check
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652 by release-only users can't hurt.
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653 */
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654 if (! PyThreadState_IsCurrent(tcur))
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655 Py_FatalError("This thread state must be current when releasing");
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
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656 assert(PyThreadState_IsCurrent(tcur));
0c26db381673 Style guide & consistency changes. No semantic changes.
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657 --tcur->gilstate_counter;
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658 assert(tcur->gilstate_counter >= 0); /* illegal counter value */
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659
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
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parents: 33714
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660 /* If we're going to destroy this thread-state, we must
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
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parents: 33714
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661 * clear it while the GIL is held, as destructors may run.
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
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662 */
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parents: 33698
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663 if (tcur->gilstate_counter == 0) {
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parents: 28616
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664 /* can't have been locked when we created it */
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Tim Peters <tim.peters@gmail.com>
parents: 33698
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665 assert(oldstate == PyGILState_UNLOCKED);
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parents: 28616
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666 PyThreadState_Clear(tcur);
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parents: 33714
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667 /* Delete the thread-state. Note this releases the GIL too!
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
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parents: 33714
diff changeset
668 * It's vital that the GIL be held here, to avoid shutdown
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
669 * races; see bugs 225673 and 1061968 (that nasty bug has a
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
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670 * habit of coming back).
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
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671 */
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
672 PyThreadState_DeleteCurrent();
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parents: 28616
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673 }
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Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
674 /* Release the lock if necessary */
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
675 else if (oldstate == PyGILState_UNLOCKED)
34928
9857daa22807 Backport my recent fix (rev. 2.40 of Python/pystate.c):
Michael W. Hudson <mwh@python.net>
parents: 34568
diff changeset
676 PyEval_SaveThread();
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parents: 28616
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677 }
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parents: 36683
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678
f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 36683
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679 #ifdef __cplusplus
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680 }
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681 #endif
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parents: 36683
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682
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parents: 28616
diff changeset
683 #endif /* WITH_THREAD */
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684
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Thomas Wouters <thomas@python.org>
parents: 36683
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685