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annotate Python/pystate.c @ 58689:514b56efd89a 3.1

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Merged revisions 77962 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r77962 | r.david.murray | 2010-02-04 11:41:57 -0500 (Thu, 04 Feb 2010) | 17 lines Merged revisions 77943,77959-77960 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r77943 | r.david.murray | 2010-02-03 08:36:23 -0500 (Wed, 03 Feb 2010) | 2 lines Explicitly mention the default value for formatdate's usegmt parameter. ........ r77959 | nick.coghlan | 2010-02-04 07:43:58 -0500 (Thu, 04 Feb 2010) | 1 line Issue 6760: Clarify args handling for subprocess.Popen. Patch by Chris Rebert ........ r77960 | r.david.murray | 2010-02-04 11:33:31 -0500 (Thu, 04 Feb 2010) | 2 lines Add Chris Rebert to ACKS for issue 6760 Popen doc improvements. ........ ................
author R. David Murray <rdmurray@bitdance.com>
date Thu, 04 Feb 2010 16:44:31 +0000
parents 620a34dc10f9
children d7a62c16505b fdd6484f1210
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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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diff changeset
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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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(
8d2194e22e67 The last of the mass checkins for separate (sub)interpreters.
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141 "PyInterpreterState_Delete: invalid interp");
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diff changeset
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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diff changeset
146 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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diff changeset
147 *p = interp->next;
14378
ca7316a00464 PyInterpreterState_New is not thread-safe, and the recent fix to _PyPclose
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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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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.
Martin v. Löwis <martin@v.loewis.de>
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173 tstate->overflowed = 0;
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174 tstate->recursion_critical = 0;
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175 tstate->tracing = 0;
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176 tstate->use_tracing = 0;
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177 tstate->tick_counter = 0;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
178 tstate->gilstate_counter = 0;
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
179 tstate->async_exc = NULL;
29842
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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diff changeset
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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4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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186 tstate->dict = NULL;
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187
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188 tstate->curexc_type = NULL;
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189 tstate->curexc_value = NULL;
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190 tstate->curexc_traceback = NULL;
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191
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192 tstate->exc_type = NULL;
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193 tstate->exc_value = NULL;
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194 tstate->exc_traceback = NULL;
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195
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196 tstate->c_profilefunc = NULL;
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197 tstate->c_tracefunc = NULL;
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198 tstate->c_profileobj = NULL;
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199 tstate->c_traceobj = NULL;
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200
35661
85651eb3d9a9 Forward port bugfix:
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diff changeset
201 #ifdef WITH_THREAD
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202 _PyGILState_NoteThreadState(tstate);
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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
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diff changeset
214 PyObject*
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
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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.
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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.
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parents: 44834
diff changeset
234 if (!def)
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
235 return -1;
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
diff changeset
236 if (!state->modules_by_index) {
49736
620a34dc10f9 Issue #3327: Don't overallocate in the modules_by_index list.
Martin v. Löwis <martin@v.loewis.de>
parents: 49613
diff changeset
237 state->modules_by_index = PyList_New(0);
47580
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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>
parents: 44834
diff changeset
244 Py_INCREF(module);
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
245 return PyList_SetItem(state->modules_by_index,
94f64f11fdd0 Implement PEP 3121: new module initialization and finalization API.
Martin v. Löwis <martin@v.loewis.de>
parents: 44834
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>
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diff changeset
247 }
5405
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parents:
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>
parents: 13256
diff changeset
250 PyThreadState_Clear(PyThreadState *tstate)
5926
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Guido van Rossum <guido@python.org>
parents: 5849
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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Guido van Rossum <guido@python.org>
parents: 5849
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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257
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258 Py_CLEAR(tstate->dict);
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259 Py_CLEAR(tstate->async_exc);
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260
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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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4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
Guido van Rossum <guido@python.org>
parents: 6549
diff changeset
388 {
9667
914f83e7fa0a Make current_tstate a global, _PyThreadState_Current. This is to
Guido van Rossum <guido@python.org>
parents: 7970
diff changeset
389 if (_PyThreadState_Current == NULL)
28616
4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
Guido van Rossum <guido@python.org>
parents: 28325
diff changeset
390 return NULL;
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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
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diff changeset
520 /* Keep this as a static, as it is not reliable! It can only
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521 ever be compared to the state for the *current* thread.
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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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524 possibly change to the current thread's state.
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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 */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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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
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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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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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diff changeset
541 */
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542 void
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543 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
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544 {
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545 assert(i && t); /* must init with valid states */
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546 autoTLSkey = PyThread_create_key();
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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
7ea2be2c0e1d Fix bug:
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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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7ea2be2c0e1d Fix bug:
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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
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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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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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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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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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589 */
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590 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
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591 Py_FatalError("Couldn't create autoTLSkey mapping");
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592
7ea2be2c0e1d Fix bug:
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593 /* PyGILState_Release must not try to delete this thread state. */
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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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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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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:
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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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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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");
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656 assert(PyThreadState_IsCurrent(tcur));
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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
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660 /* If we're going to destroy this thread-state, we must
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661 * clear it while the GIL is held, as destructors may run.
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662 */
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663 if (tcur->gilstate_counter == 0) {
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664 /* can't have been locked when we created it */
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665 assert(oldstate == PyGILState_UNLOCKED);
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666 PyThreadState_Clear(tcur);
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667 /* Delete the thread-state. Note this releases the GIL too!
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668 * It's vital that the GIL be held here, to avoid shutdown
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669 * races; see bugs 225673 and 1061968 (that nasty bug has a
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670 * habit of coming back).
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671 */
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672 PyThreadState_DeleteCurrent();
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673 }
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674 /* Release the lock if necessary */
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675 else if (oldstate == PyGILState_UNLOCKED)
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676 PyEval_SaveThread();
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677 }
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678
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679 #ifdef __cplusplus
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680 }
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681 #endif
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682
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683 #endif /* WITH_THREAD */
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684
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685