Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 38536:175cbdf9a5fb legacy-trunk

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[ 1497053 ] Let dicts propagate the exceptions in user __eq__(). [ 1456209 ] dictresize() vulnerability ( <- backport candidate ).
author Armin Rigo <arigo@tunes.org>
date Thu, 01 Jun 2006 13:19:12 +0000
parents 7f72791f0aec
children b6fd499e4343
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Thread and interpreter state structures and their interfaces */
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3
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4 #include "Python.h"
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5
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6 /* --------------------------------------------------------------------------
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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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56
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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 interp->modules = NULL;
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67 interp->sysdict = NULL;
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68 interp->builtins = NULL;
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69 interp->tstate_head = NULL;
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70 interp->codec_search_path = NULL;
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71 interp->codec_search_cache = NULL;
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72 interp->codec_error_registry = NULL;
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73 #ifdef HAVE_DLOPEN
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74 #ifdef RTLD_NOW
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75 interp->dlopenflags = RTLD_NOW;
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76 #else
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77 interp->dlopenflags = RTLD_LAZY;
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78 #endif
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79 #endif
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80 #ifdef WITH_TSC
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81 interp->tscdump = 0;
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82 #endif
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83
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84 HEAD_LOCK();
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85 interp->next = interp_head;
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86 interp_head = interp;
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87 HEAD_UNLOCK();
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88 }
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89
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90 return interp;
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91 }
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92
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93
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94 void
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95 PyInterpreterState_Clear(PyInterpreterState *interp)
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96 {
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97 PyThreadState *p;
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98 HEAD_LOCK();
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99 for (p = interp->tstate_head; p != NULL; p = p->next)
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100 PyThreadState_Clear(p);
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101 HEAD_UNLOCK();
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102 Py_CLEAR(interp->codec_search_path);
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103 Py_CLEAR(interp->codec_search_cache);
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104 Py_CLEAR(interp->codec_error_registry);
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105 Py_CLEAR(interp->modules);
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106 Py_CLEAR(interp->sysdict);
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107 Py_CLEAR(interp->builtins);
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108 }
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109
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110
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111 static void
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112 zapthreads(PyInterpreterState *interp)
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113 {
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114 PyThreadState *p;
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115 /* No need to lock the mutex here because this should only happen
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116 when the threads are all really dead (XXX famous last words). */
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117 while ((p = interp->tstate_head) != NULL) {
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118 PyThreadState_Delete(p);
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119 }
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120 }
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121
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122
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123 void
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124 PyInterpreterState_Delete(PyInterpreterState *interp)
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125 {
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126 PyInterpreterState **p;
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127 zapthreads(interp);
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128 HEAD_LOCK();
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129 for (p = &interp_head; ; p = &(*p)->next) {
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130 if (*p == NULL)
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131 Py_FatalError(
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132 "PyInterpreterState_Delete: invalid interp");
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133 if (*p == interp)
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134 break;
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135 }
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diff changeset
136 if (interp->tstate_head != NULL)
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137 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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138 *p = interp->next;
14378
ca7316a00464 PyInterpreterState_New is not thread-safe, and the recent fix to _PyPclose
Tim Peters <tim.peters@gmail.com>
parents: 14375
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139 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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140 free(interp);
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141 }
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142
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143
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144 /* Default implementation for _PyThreadState_GetFrame */
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diff changeset
145 static struct _frame *
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diff changeset
146 threadstate_getframe(PyThreadState *self)
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diff changeset
147 {
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148 return self->frame;
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diff changeset
149 }
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150
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151 PyThreadState *
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152 PyThreadState_New(PyInterpreterState *interp)
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153 {
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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154 PyThreadState *tstate = (PyThreadState *)malloc(sizeof(PyThreadState));
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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155
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diff changeset
156 if (_PyThreadState_GetFrame == NULL)
27978
4b99a701defe - PyEval_GetFrame() is now declared to return a PyFrameObject *
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157 _PyThreadState_GetFrame = threadstate_getframe;
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158
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159 if (tstate != NULL) {
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160 tstate->interp = interp;
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161
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162 tstate->frame = NULL;
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163 tstate->recursion_depth = 0;
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164 tstate->tracing = 0;
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165 tstate->use_tracing = 0;
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166 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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167 tstate->gilstate_counter = 0;
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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168 tstate->async_exc = NULL;
29842
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
Martin v. Löwis <martin@v.loewis.de>
parents: 29643
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169 #ifdef WITH_THREAD
29643
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170 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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171 #else
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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172 tstate->thread_id = 0;
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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173 #endif
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174
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175 tstate->dict = NULL;
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176
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177 tstate->curexc_type = NULL;
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178 tstate->curexc_value = NULL;
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179 tstate->curexc_traceback = NULL;
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180
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181 tstate->exc_type = NULL;
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182 tstate->exc_value = NULL;
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183 tstate->exc_traceback = NULL;
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184
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185 tstate->c_profilefunc = NULL;
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186 tstate->c_tracefunc = NULL;
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187 tstate->c_profileobj = NULL;
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188 tstate->c_traceobj = NULL;
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189
35661
85651eb3d9a9 Forward port bugfix:
Michael W. Hudson <mwh@python.net>
parents: 35117
diff changeset
190 #ifdef WITH_THREAD
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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191 _PyGILState_NoteThreadState(tstate);
35661
85651eb3d9a9 Forward port bugfix:
Michael W. Hudson <mwh@python.net>
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diff changeset
192 #endif
35117
7ea2be2c0e1d Fix bug:
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193
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194 HEAD_LOCK();
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195 tstate->next = interp->tstate_head;
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196 interp->tstate_head = tstate;
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197 HEAD_UNLOCK();
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198 }
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199
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200 return tstate;
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201 }
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202
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203
5926
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diff changeset
204 void
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Thomas Wouters <thomas@python.org>
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diff changeset
205 PyThreadState_Clear(PyThreadState *tstate)
5926
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diff changeset
206 {
6549
a8e3b2e9f5d2 The warning about thread still having a frame now only happens in
Guido van Rossum <guido@python.org>
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diff changeset
207 if (Py_VerboseFlag && tstate->frame != NULL)
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diff changeset
208 fprintf(stderr,
6124
cc2c84769636 Added missing newline to warning msg
Guido van Rossum <guido@python.org>
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diff changeset
209 "PyThreadState_Clear: warning: thread still has a frame\n");
5926
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210
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
211 Py_CLEAR(tstate->frame);
5926
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diff changeset
212
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
213 Py_CLEAR(tstate->dict);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
214 Py_CLEAR(tstate->async_exc);
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
215
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
216 Py_CLEAR(tstate->curexc_type);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
217 Py_CLEAR(tstate->curexc_value);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
218 Py_CLEAR(tstate->curexc_traceback);
5926
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diff changeset
219
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
220 Py_CLEAR(tstate->exc_type);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
221 Py_CLEAR(tstate->exc_value);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
222 Py_CLEAR(tstate->exc_traceback);
5926
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diff changeset
223
18326
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
224 tstate->c_profilefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
225 tstate->c_tracefunc = NULL;
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
226 Py_CLEAR(tstate->c_profileobj);
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
227 Py_CLEAR(tstate->c_traceobj);
5405
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parents:
diff changeset
228 }
b7871ca930ad Massive changes for separate thread state management.
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parents:
diff changeset
229
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
230
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
231 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
232 static void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
233 tstate_delete_common(PyThreadState *tstate)
5405
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parents:
diff changeset
234 {
5926
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diff changeset
235 PyInterpreterState *interp;
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diff changeset
236 PyThreadState **p;
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diff changeset
237 if (tstate == NULL)
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diff changeset
238 Py_FatalError("PyThreadState_Delete: NULL tstate");
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diff changeset
239 interp = tstate->interp;
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diff changeset
240 if (interp == NULL)
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diff changeset
241 Py_FatalError("PyThreadState_Delete: NULL interp");
11011
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diff changeset
242 HEAD_LOCK();
5926
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diff changeset
243 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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diff changeset
244 if (*p == NULL)
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diff changeset
245 Py_FatalError(
8d2194e22e67 The last of the mass checkins for separate (sub)interpreters.
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diff changeset
246 "PyThreadState_Delete: invalid tstate");
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diff changeset
247 if (*p == tstate)
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diff changeset
248 break;
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diff changeset
249 }
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diff changeset
250 *p = tstate->next;
11011
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parents: 9667
diff changeset
251 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
Tim Peters <tim.peters@gmail.com>
parents: 33711
diff changeset
252 free(tstate);
5405
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Guido van Rossum <guido@python.org>
parents:
diff changeset
253 }
b7871ca930ad Massive changes for separate thread state management.
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parents:
diff changeset
254
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
255
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
256 void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
257 PyThreadState_Delete(PyThreadState *tstate)
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
258 {
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
259 if (tstate == _PyThreadState_Current)
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
260 Py_FatalError("PyThreadState_Delete: tstate is still current");
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
261 tstate_delete_common(tstate);
36683
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
262 #ifdef WITH_THREAD
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
263 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
264 PyThread_delete_key_value(autoTLSkey);
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
265 #endif /* WITH_THREAD */
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
266 }
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
267
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
268
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Guido van Rossum <guido@python.org>
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269 #ifdef WITH_THREAD
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270 void
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271 PyThreadState_DeleteCurrent()
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272 {
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273 PyThreadState *tstate = _PyThreadState_Current;
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274 if (tstate == NULL)
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275 Py_FatalError(
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276 "PyThreadState_DeleteCurrent: no current tstate");
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277 _PyThreadState_Current = NULL;
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278 tstate_delete_common(tstate);
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279 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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280 PyThread_delete_key_value(autoTLSkey);
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281 PyEval_ReleaseLock();
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282 }
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283 #endif /* WITH_THREAD */
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284
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285
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286 PyThreadState *
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287 PyThreadState_Get(void)
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288 {
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289 if (_PyThreadState_Current == NULL)
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290 Py_FatalError("PyThreadState_Get: no current thread");
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291
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292 return _PyThreadState_Current;
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293 }
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294
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295
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296 PyThreadState *
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297 PyThreadState_Swap(PyThreadState *newts)
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298 {
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299 PyThreadState *oldts = _PyThreadState_Current;
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300
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301 _PyThreadState_Current = newts;
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302 /* It should not be possible for more than one thread state
33698
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303 to be used for a thread. Check this the best we can in debug
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304 builds.
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305 */
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33475661823d Patch #729300: Disable error message if Python is not built for threads.
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306 #if defined(Py_DEBUG) && defined(WITH_THREAD)
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307 if (newts) {
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308 PyThreadState *check = PyGILState_GetThisThreadState();
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309 if (check && check->interp == newts->interp && check != newts)
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310 Py_FatalError("Invalid thread state for this thread");
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311 }
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312 #endif
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313 return oldts;
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314 }
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315
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316 /* An extension mechanism to store arbitrary additional per-thread state.
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317 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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318 state; the caller should pick a unique key and store its state there. If
28616
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319 PyThreadState_GetDict() returns NULL, an exception has *not* been raised
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320 and the caller should assume no per-thread state is available. */
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321
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322 PyObject *
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323 PyThreadState_GetDict(void)
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324 {
9667
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325 if (_PyThreadState_Current == NULL)
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326 return NULL;
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327
28616
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328 if (_PyThreadState_Current->dict == NULL) {
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diff changeset
329 PyObject *d;
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330 _PyThreadState_Current->dict = d = PyDict_New();
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331 if (d == NULL)
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332 PyErr_Clear();
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333 }
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334 return _PyThreadState_Current->dict;
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335 }
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336
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337
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338 /* Asynchronously raise an exception in a thread.
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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339 Requested by Just van Rossum and Alex Martelli.
34568
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340 To prevent naive misuse, you must write your own extension
29643
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341 to call this. Must be called with the GIL held.
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342 Returns the number of tstates modified; if it returns a number
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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343 greater than one, you're in trouble, and you should call it again
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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344 with exc=NULL to revert the effect. This raises no exceptions. */
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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345
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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346 int
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
347 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
348 PyThreadState *tstate = PyThreadState_GET();
29643
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349 PyInterpreterState *interp = tstate->interp;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
350 PyThreadState *p;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
351 int count = 0;
34568
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352 HEAD_LOCK();
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
353 for (p = interp->tstate_head; p != NULL; p = p->next) {
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
354 if (p->thread_id != id)
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
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diff changeset
355 continue;
37752
7f72791f0aec Zap ZAP.
Martin v. Löwis <martin@v.loewis.de>
parents: 37655
diff changeset
356 Py_CLEAR(p->async_exc);
29643
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diff changeset
357 Py_XINCREF(exc);
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
358 p->async_exc = exc;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
359 count += 1;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
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diff changeset
360 }
34568
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Guido van Rossum <guido@python.org>
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diff changeset
361 HEAD_UNLOCK();
29643
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362 return count;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
363 }
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
364
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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365
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366 /* Routines for advanced debuggers, requested by David Beazley.
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367 Don't use unless you know what you are doing! */
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368
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369 PyInterpreterState *
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diff changeset
370 PyInterpreterState_Head(void)
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diff changeset
371 {
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diff changeset
372 return interp_head;
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diff changeset
373 }
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374
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375 PyInterpreterState *
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diff changeset
376 PyInterpreterState_Next(PyInterpreterState *interp) {
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377 return interp->next;
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diff changeset
378 }
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diff changeset
379
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diff changeset
380 PyThreadState *
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diff changeset
381 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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382 return interp->tstate_head;
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diff changeset
383 }
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diff changeset
384
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385 PyThreadState *
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diff changeset
386 PyThreadState_Next(PyThreadState *tstate) {
b0329649b8cf Add a low-level API to access interpreters, for David Beazley.
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387 return tstate->next;
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diff changeset
388 }
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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parents: 28616
diff changeset
389
29643
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diff changeset
390
28694
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diff changeset
391 /* Python "auto thread state" API. */
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diff changeset
392 #ifdef WITH_THREAD
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diff changeset
393
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
394 /* Keep this as a static, as it is not reliable! It can only
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
395 ever be compared to the state for the *current* thread.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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parents: 28616
diff changeset
396 * 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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diff changeset
397 value may change immediately after comparison, as it can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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parents: 28616
diff changeset
398 possibly change to the current thread's state.
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399 * If equal, then the current thread holds the lock, so the value can't
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400 change until we yield the lock.
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401 */
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402 static int
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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403 PyThreadState_IsCurrent(PyThreadState *tstate)
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404 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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405 /* Must be the tstate for this thread */
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406 assert(PyGILState_GetThisThreadState()==tstate);
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407 /* On Windows at least, simple reads and writes to 32 bit values
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diff changeset
408 are atomic.
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409 */
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410 return tstate == _PyThreadState_Current;
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411 }
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412
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413 /* Internal initialization/finalization functions called by
090ffcb83f0a Trim trailing whitespace.
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414 Py_Initialize/Py_Finalize
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415 */
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416 void
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417 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
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418 {
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419 assert(i && t); /* must init with valid states */
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420 autoTLSkey = PyThread_create_key();
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421 autoInterpreterState = i;
33706
4981ba54f43d _PyGILState_Init(), PyGILState_Ensure(): Since PyThread_set_key_value()
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422 assert(PyThread_get_key_value(autoTLSkey) == NULL);
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423 assert(t->gilstate_counter == 0);
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424
7ea2be2c0e1d Fix bug:
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425 _PyGILState_NoteThreadState(t);
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426 }
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427
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428 void
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429 _PyGILState_Fini(void)
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430 {
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431 PyThread_delete_key(autoTLSkey);
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432 autoTLSkey = 0;
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433 autoInterpreterState = NULL;;
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434 }
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435
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436 /* When a thread state is created for a thread by some mechanism other than
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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437 PyGILState_Ensure, it's important that the GILState machinery knows about
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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438 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>
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diff changeset
439 a better fix for SF bug #1010677 than the first one attempted).
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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440 */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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441 void
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442 _PyGILState_NoteThreadState(PyThreadState* tstate)
7ea2be2c0e1d Fix bug:
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443 {
7ea2be2c0e1d Fix bug:
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444 /* If autoTLSkey is 0, this must be the very first threadstate created
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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445 in Py_Initialize(). Don't do anything for now (we'll be back here
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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446 when _PyGILState_Init is called). */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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447 if (!autoTLSkey)
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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448 return;
7ea2be2c0e1d Fix bug:
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449
7ea2be2c0e1d Fix bug:
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450 /* Stick the thread state for this thread in thread local storage.
7ea2be2c0e1d Fix bug:
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451
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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452 The only situation where you can legitimately have more than one
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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453 thread state for an OS level thread is when there are multiple
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
454 interpreters, when:
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
455
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
456 a) You shouldn't really be using the PyGILState_ APIs anyway,
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
457 and:
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
458
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
459 b) The slightly odd way PyThread_set_key_value works (see
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
460 comments by its implementation) means that the first thread
7ea2be2c0e1d Fix bug:
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diff changeset
461 state created for that given OS level thread will "win",
7ea2be2c0e1d Fix bug:
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diff changeset
462 which seems reasonable behaviour.
7ea2be2c0e1d Fix bug:
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463 */
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parents: 35095
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464 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
7ea2be2c0e1d Fix bug:
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465 Py_FatalError("Couldn't create autoTLSkey mapping");
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466
7ea2be2c0e1d Fix bug:
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467 /* PyGILState_Release must not try to delete this thread state. */
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468 tstate->gilstate_counter = 1;
7ea2be2c0e1d Fix bug:
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469 }
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diff changeset
470
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471 /* The public functions */
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472 PyThreadState *
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473 PyGILState_GetThisThreadState(void)
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474 {
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475 if (autoInterpreterState == NULL || autoTLSkey == 0)
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476 return NULL;
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477 return (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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478 }
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479
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480 PyGILState_STATE
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481 PyGILState_Ensure(void)
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482 {
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diff changeset
483 int current;
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484 PyThreadState *tcur;
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090ffcb83f0a Trim trailing whitespace.
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485 /* Note that we do not auto-init Python here - apart from
090ffcb83f0a Trim trailing whitespace.
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486 potential races with 2 threads auto-initializing, pep-311
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487 spells out other issues. Embedders are expected to have
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488 called Py_Initialize() and usually PyEval_InitThreads().
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diff changeset
489 */
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490 assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
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diff changeset
491 tcur = (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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492 if (tcur == NULL) {
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diff changeset
493 /* Create a new thread state for this thread */
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diff changeset
494 tcur = PyThreadState_New(autoInterpreterState);
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495 if (tcur == NULL)
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diff changeset
496 Py_FatalError("Couldn't create thread-state for new thread");
35117
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Michael W. Hudson <mwh@python.net>
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diff changeset
497 /* This is our thread state! We'll need to delete it in the
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
498 matching call to PyGILState_Release(). */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
499 tcur->gilstate_counter = 0;
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500 current = 0; /* new thread state is never current */
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501 }
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diff changeset
502 else
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diff changeset
503 current = PyThreadState_IsCurrent(tcur);
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diff changeset
504 if (current == 0)
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diff changeset
505 PyEval_RestoreThread(tcur);
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diff changeset
506 /* Update our counter in the thread-state - no need for locks:
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
507 - tcur will remain valid as we hold the GIL.
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diff changeset
508 - the counter is safe as we are the only thread "allowed"
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diff changeset
509 to modify this value
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diff changeset
510 */
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diff changeset
511 ++tcur->gilstate_counter;
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512 return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
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513 }
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diff changeset
514
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515 void
0c26db381673 Style guide & consistency changes. No semantic changes.
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diff changeset
516 PyGILState_Release(PyGILState_STATE oldstate)
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diff changeset
517 {
37606
f448d0075691 more low-hanging fruit to make code compile under a C++ compiler. Not
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518 PyThreadState *tcur = (PyThreadState *)PyThread_get_key_value(
f448d0075691 more low-hanging fruit to make code compile under a C++ compiler. Not
Anthony Baxter <anthonybaxter@gmail.com>
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diff changeset
519 autoTLSkey);
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520 if (tcur == NULL)
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diff changeset
521 Py_FatalError("auto-releasing thread-state, "
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
522 "but no thread-state for this thread");
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diff changeset
523 /* We must hold the GIL and have our thread state current */
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diff changeset
524 /* XXX - remove the check - the assert should be fine,
33698
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diff changeset
525 but while this is very new (April 2003), the extra check
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
526 by release-only users can't hurt.
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
527 */
33699
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diff changeset
528 if (! PyThreadState_IsCurrent(tcur))
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diff changeset
529 Py_FatalError("This thread state must be current when releasing");
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diff changeset
530 assert(PyThreadState_IsCurrent(tcur));
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
531 --tcur->gilstate_counter;
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
532 assert(tcur->gilstate_counter >= 0); /* illegal counter value */
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
533
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
534 /* If we're going to destroy this thread-state, we must
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
535 * 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
diff changeset
536 */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
537 if (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
538 /* can't have been locked when we created it */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
539 assert(oldstate == PyGILState_UNLOCKED);
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
540 PyThreadState_Clear(tcur);
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
541 /* Delete the thread-state. Note this releases the GIL too!
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
542 * 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
543 * 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
diff changeset
544 * habit of coming back).
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
545 */
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
546 PyThreadState_DeleteCurrent();
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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 /* 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
549 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
550 PyEval_SaveThread();
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
551 }
37655
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
552
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
553 #ifdef __cplusplus
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
554 }
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
555 #endif
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
556
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
557 #endif /* WITH_THREAD */
37655
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
558
2f3f2e32dfd9 spread the extern "C" { } magic pixie dust around. Python itself builds now
Anthony Baxter <anthonybaxter@gmail.com>
parents: 37606
diff changeset
559