Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 40053:693ff5d73412 2.4

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Port of universal binary support for Mac OSX from python 2.5. This takes away the need for the out-of-tree universal binary support that was used to build the 2.4.3 installer. Missing here relative to that tree are some changes to IDLE, IMHO those patches aren't appropriate for the 2.4 branch and users are better of using 2.5's IDLE.
author Ronald Oussoren <ronaldoussoren@mac.com>
date Sun, 08 Oct 2006 17:41:25 +0000
parents ab13576374b1
children
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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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26 #define ZAP(x) { \
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27 PyObject *tmp = (PyObject *)(x); \
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28 (x) = NULL; \
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29 Py_XDECREF(tmp); \
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30 }
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32
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33 #ifdef WITH_THREAD
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34 #include "pythread.h"
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35 static PyThread_type_lock head_mutex = NULL; /* Protects interp->tstate_head */
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36 #define HEAD_INIT() (void)(head_mutex || (head_mutex = PyThread_allocate_lock()))
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37 #define HEAD_LOCK() PyThread_acquire_lock(head_mutex, WAIT_LOCK)
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38 #define HEAD_UNLOCK() PyThread_release_lock(head_mutex)
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39
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40 /* The single PyInterpreterState used by this process'
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41 GILState implementation
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42 */
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43 static PyInterpreterState *autoInterpreterState = NULL;
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44 static int autoTLSkey = 0;
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45 #else
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46 #define HEAD_INIT() /* Nothing */
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47 #define HEAD_LOCK() /* Nothing */
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48 #define HEAD_UNLOCK() /* Nothing */
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49 #endif
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50
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51 static PyInterpreterState *interp_head = NULL;
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52
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53 PyThreadState *_PyThreadState_Current = NULL;
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54 PyThreadFrameGetter _PyThreadState_GetFrame = NULL;
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55
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56 #ifdef WITH_THREAD
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57 static void _PyGILState_NoteThreadState(PyThreadState* tstate);
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58 #endif
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61 PyInterpreterState *
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62 PyInterpreterState_New(void)
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63 {
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64 PyInterpreterState *interp = (PyInterpreterState *)
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65 malloc(sizeof(PyInterpreterState));
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66
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67 if (interp != NULL) {
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68 HEAD_INIT();
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69 #ifdef WITH_THREAD
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70 if (head_mutex == NULL)
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71 Py_FatalError("Can't initialize threads for interpreter");
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72 #endif
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73 interp->modules = NULL;
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74 interp->sysdict = NULL;
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75 interp->builtins = NULL;
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76 interp->tstate_head = NULL;
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77 interp->codec_search_path = NULL;
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78 interp->codec_search_cache = NULL;
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79 interp->codec_error_registry = NULL;
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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 ZAP(interp->codec_search_path);
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110 ZAP(interp->codec_search_cache);
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111 ZAP(interp->codec_error_registry);
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112 ZAP(interp->modules);
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113 ZAP(interp->sysdict);
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114 ZAP(interp->builtins);
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115 }
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116
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117
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118 static void
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119 zapthreads(PyInterpreterState *interp)
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120 {
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121 PyThreadState *p;
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122 /* No need to lock the mutex here because this should only happen
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123 when the threads are all really dead (XXX famous last words). */
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124 while ((p = interp->tstate_head) != NULL) {
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125 PyThreadState_Delete(p);
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126 }
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127 }
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128
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129
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130 void
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diff changeset
131 PyInterpreterState_Delete(PyInterpreterState *interp)
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132 {
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133 PyInterpreterState **p;
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134 zapthreads(interp);
14378
ca7316a00464 PyInterpreterState_New is not thread-safe, and the recent fix to _PyPclose
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parents: 14375
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135 HEAD_LOCK();
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diff changeset
136 for (p = &interp_head; ; p = &(*p)->next) {
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diff changeset
137 if (*p == NULL)
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diff changeset
138 Py_FatalError(
8d2194e22e67 The last of the mass checkins for separate (sub)interpreters.
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139 "PyInterpreterState_Delete: invalid interp");
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diff changeset
140 if (*p == interp)
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diff changeset
141 break;
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diff changeset
142 }
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143 if (interp->tstate_head != NULL)
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144 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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145 *p = interp->next;
14378
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parents: 14375
diff changeset
146 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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147 free(interp);
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148 }
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149
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150
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151 /* Default implementation for _PyThreadState_GetFrame */
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diff changeset
152 static struct _frame *
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153 threadstate_getframe(PyThreadState *self)
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154 {
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155 return self->frame;
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156 }
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157
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158 PyThreadState *
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159 PyThreadState_New(PyInterpreterState *interp)
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160 {
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161 PyThreadState *tstate = (PyThreadState *)malloc(sizeof(PyThreadState));
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162
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163 if (_PyThreadState_GetFrame == NULL)
27978
4b99a701defe - PyEval_GetFrame() is now declared to return a PyFrameObject *
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164 _PyThreadState_GetFrame = threadstate_getframe;
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165
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166 if (tstate != NULL) {
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167 tstate->interp = interp;
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168
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169 tstate->frame = NULL;
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170 tstate->recursion_depth = 0;
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171 tstate->tracing = 0;
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172 tstate->use_tracing = 0;
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173 tstate->tick_counter = 0;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
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174 tstate->gilstate_counter = 0;
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175 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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176 #ifdef WITH_THREAD
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177 tstate->thread_id = PyThread_get_thread_ident();
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014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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178 #else
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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diff changeset
179 tstate->thread_id = 0;
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
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diff changeset
180 #endif
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181
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182 tstate->dict = NULL;
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183
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184 tstate->curexc_type = NULL;
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185 tstate->curexc_value = NULL;
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186 tstate->curexc_traceback = NULL;
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187
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188 tstate->exc_type = NULL;
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189 tstate->exc_value = NULL;
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190 tstate->exc_traceback = NULL;
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191
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192 tstate->c_profilefunc = NULL;
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193 tstate->c_tracefunc = NULL;
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194 tstate->c_profileobj = NULL;
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195 tstate->c_traceobj = NULL;
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196
35660
6d04cb2cdd4a Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35631
diff changeset
197 #ifdef WITH_THREAD
35631
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198 _PyGILState_NoteThreadState(tstate);
35660
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diff changeset
199 #endif
35631
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200
11011
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201 HEAD_LOCK();
5926
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202 tstate->next = interp->tstate_head;
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203 interp->tstate_head = tstate;
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204 HEAD_UNLOCK();
5926
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205 }
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206
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207 return tstate;
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208 }
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209
5405
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210
5926
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diff changeset
211 void
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Thomas Wouters <thomas@python.org>
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diff changeset
212 PyThreadState_Clear(PyThreadState *tstate)
5926
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diff changeset
213 {
6549
a8e3b2e9f5d2 The warning about thread still having a frame now only happens in
Guido van Rossum <guido@python.org>
parents: 6124
diff changeset
214 if (Py_VerboseFlag && tstate->frame != NULL)
5926
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diff changeset
215 fprintf(stderr,
6124
cc2c84769636 Added missing newline to warning msg
Guido van Rossum <guido@python.org>
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diff changeset
216 "PyThreadState_Clear: warning: thread still has a frame\n");
5926
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diff changeset
217
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diff changeset
218 ZAP(tstate->frame);
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diff changeset
219
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
220 ZAP(tstate->dict);
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
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diff changeset
221 ZAP(tstate->async_exc);
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
222
5926
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diff changeset
223 ZAP(tstate->curexc_type);
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diff changeset
224 ZAP(tstate->curexc_value);
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diff changeset
225 ZAP(tstate->curexc_traceback);
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diff changeset
226
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diff changeset
227 ZAP(tstate->exc_type);
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diff changeset
228 ZAP(tstate->exc_value);
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diff changeset
229 ZAP(tstate->exc_traceback);
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diff changeset
230
18326
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
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diff changeset
231 tstate->c_profilefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
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diff changeset
232 tstate->c_tracefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
233 ZAP(tstate->c_profileobj);
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
234 ZAP(tstate->c_traceobj);
5405
b7871ca930ad Massive changes for separate thread state management.
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diff changeset
235 }
b7871ca930ad Massive changes for separate thread state management.
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parents:
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236
b7871ca930ad Massive changes for separate thread state management.
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diff changeset
237
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
238 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
239 static void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
240 tstate_delete_common(PyThreadState *tstate)
5405
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diff changeset
241 {
5926
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diff changeset
242 PyInterpreterState *interp;
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diff changeset
243 PyThreadState **p;
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diff changeset
244 if (tstate == NULL)
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diff changeset
245 Py_FatalError("PyThreadState_Delete: NULL tstate");
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diff changeset
246 interp = tstate->interp;
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diff changeset
247 if (interp == NULL)
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diff changeset
248 Py_FatalError("PyThreadState_Delete: NULL interp");
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249 HEAD_LOCK();
5926
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diff changeset
250 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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diff changeset
251 if (*p == NULL)
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diff changeset
252 Py_FatalError(
8d2194e22e67 The last of the mass checkins for separate (sub)interpreters.
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diff changeset
253 "PyThreadState_Delete: invalid tstate");
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diff changeset
254 if (*p == tstate)
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diff changeset
255 break;
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diff changeset
256 }
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diff changeset
257 *p = tstate->next;
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diff changeset
258 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
Tim Peters <tim.peters@gmail.com>
parents: 33711
diff changeset
259 free(tstate);
5405
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diff changeset
260 }
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parents:
diff changeset
261
b7871ca930ad Massive changes for separate thread state management.
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diff changeset
262
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
263 void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
264 PyThreadState_Delete(PyThreadState *tstate)
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
265 {
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
266 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
267 Py_FatalError("PyThreadState_Delete: tstate is still current");
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268 tstate_delete_common(tstate);
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269 #ifdef WITH_THREAD
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270 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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271 PyThread_delete_key_value(autoTLSkey);
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272 #endif /* WITH_THREAD */
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273 }
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274
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275
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276 #ifdef WITH_THREAD
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277 void
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278 PyThreadState_DeleteCurrent()
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279 {
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280 PyThreadState *tstate = _PyThreadState_Current;
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281 if (tstate == NULL)
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282 Py_FatalError(
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283 "PyThreadState_DeleteCurrent: no current tstate");
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284 _PyThreadState_Current = NULL;
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285 tstate_delete_common(tstate);
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286 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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287 PyThread_delete_key_value(autoTLSkey);
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288 PyEval_ReleaseLock();
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289 }
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290 #endif /* WITH_THREAD */
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291
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292
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293 PyThreadState *
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294 PyThreadState_Get(void)
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295 {
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296 if (_PyThreadState_Current == NULL)
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297 Py_FatalError("PyThreadState_Get: no current thread");
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298
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299 return _PyThreadState_Current;
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300 }
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301
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302
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303 PyThreadState *
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304 PyThreadState_Swap(PyThreadState *new)
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305 {
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306 PyThreadState *old = _PyThreadState_Current;
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307
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308 _PyThreadState_Current = new;
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309 /* It should not be possible for more than one thread state
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310 to be used for a thread. Check this the best we can in debug
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311 builds.
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312 */
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33475661823d Patch #729300: Disable error message if Python is not built for threads.
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313 #if defined(Py_DEBUG) && defined(WITH_THREAD)
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314 if (new) {
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315 PyThreadState *check = PyGILState_GetThisThreadState();
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316 if (check && check != new)
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317 Py_FatalError("Invalid thread state for this thread");
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318 }
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319 #endif
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320 return old;
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321 }
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322
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323 /* An extension mechanism to store arbitrary additional per-thread state.
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324 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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325 state; the caller should pick a unique key and store its state there. If
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4f0b7acffc7d - pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()
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326 PyThreadState_GetDict() returns NULL, an exception has *not* been raised
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327 and the caller should assume no per-thread state is available. */
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328
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329 PyObject *
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330 PyThreadState_GetDict(void)
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331 {
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332 if (_PyThreadState_Current == NULL)
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333 return NULL;
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334
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335 if (_PyThreadState_Current->dict == NULL) {
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336 PyObject *d;
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337 _PyThreadState_Current->dict = d = PyDict_New();
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338 if (d == NULL)
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339 PyErr_Clear();
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340 }
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341 return _PyThreadState_Current->dict;
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342 }
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343
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344
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345 /* Asynchronously raise an exception in a thread.
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346 Requested by Just van Rossum and Alex Martelli.
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347 To prevent naive misuse, you must write your own extension
29643
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348 to call this. Must be called with the GIL held.
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349 Returns the number of tstates modified; if it returns a number
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350 greater than one, you're in trouble, and you should call it again
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351 with exc=NULL to revert the effect. This raises no exceptions. */
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352
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diff changeset
353 int
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354 PyThreadState_SetAsyncExc(long id, PyObject *exc) {
31797
846b3ee7e106 Changed random calls to PyThreadState_Get() to use the macro
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355 PyThreadState *tstate = PyThreadState_GET();
29643
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356 PyInterpreterState *interp = tstate->interp;
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357 PyThreadState *p;
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358 int count = 0;
34568
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359 HEAD_LOCK();
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360 for (p = interp->tstate_head; p != NULL; p = p->next) {
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361 if (p->thread_id != id)
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362 continue;
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363 ZAP(p->async_exc);
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364 Py_XINCREF(exc);
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365 p->async_exc = exc;
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366 count += 1;
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367 }
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368 HEAD_UNLOCK();
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369 return count;
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370 }
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371
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372
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373 /* Routines for advanced debuggers, requested by David Beazley.
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374 Don't use unless you know what you are doing! */
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375
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376 PyInterpreterState *
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377 PyInterpreterState_Head(void)
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378 {
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379 return interp_head;
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380 }
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381
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382 PyInterpreterState *
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383 PyInterpreterState_Next(PyInterpreterState *interp) {
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384 return interp->next;
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385 }
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386
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387 PyThreadState *
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388 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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389 return interp->tstate_head;
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390 }
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391
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392 PyThreadState *
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393 PyThreadState_Next(PyThreadState *tstate) {
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394 return tstate->next;
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395 }
28694
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396
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397
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398 /* Python "auto thread state" API. */
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399 #ifdef WITH_THREAD
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400
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401 /* 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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402 ever be compared to the state for the *current* thread.
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403 * If not equal, then it doesn't matter that the actual
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diff changeset
404 value may change immediately after comparison, as it can't
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
405 possibly change to the current thread's state.
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406 * 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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407 change until we yield the lock.
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408 */
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409 static int
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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410 PyThreadState_IsCurrent(PyThreadState *tstate)
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411 {
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412 /* Must be the tstate for this thread */
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413 assert(PyGILState_GetThisThreadState()==tstate);
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414 /* On Windows at least, simple reads and writes to 32 bit values
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415 are atomic.
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416 */
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417 return tstate == _PyThreadState_Current;
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418 }
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419
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420 /* Internal initialization/finalization functions called by
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421 Py_Initialize/Py_Finalize
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422 */
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423 void
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424 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
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425 {
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426 assert(i && t); /* must init with valid states */
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427 autoTLSkey = PyThread_create_key();
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428 autoInterpreterState = i;
33706
4981ba54f43d _PyGILState_Init(), PyGILState_Ensure(): Since PyThread_set_key_value()
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429 assert(PyThread_get_key_value(autoTLSkey) == NULL);
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430 assert(t->gilstate_counter == 0);
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431
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432 _PyGILState_NoteThreadState(t);
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433 }
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434
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435 void
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436 _PyGILState_Fini(void)
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437 {
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438 PyThread_delete_key(autoTLSkey);
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439 autoTLSkey = 0;
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440 autoInterpreterState = NULL;;
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441 }
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442
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443 /* When a thread state is created for a thread by some mechanism other than
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444 PyGILState_Ensure, it's important that the GILState machinery knows about
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445 it so it doesn't try to create another thread state for the thread (this is
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446 a better fix for SF bug #1010677 than the first one attempted).
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447 */
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448 void
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449 _PyGILState_NoteThreadState(PyThreadState* tstate)
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450 {
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451 /* If autoTLSkey is 0, this must be the very first threadstate created
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452 in Py_Initialize(). Don't do anything for now (we'll be back here
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453 when _PyGILState_Init is called). */
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454 if (!autoTLSkey)
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455 return;
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456
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457 /* Stick the thread state for this thread in thread local storage.
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458
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459 The only situation where you can legitimately have more than one
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460 thread state for an OS level thread is when there are multiple
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461 interpreters, when:
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462
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463 a) You shouldn't really be using the PyGILState_ APIs anyway,
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464 and:
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465
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466 b) The slightly odd way PyThread_set_key_value works (see
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467 comments by its implementation) means that the first thread
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468 state created for that given OS level thread will "win",
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469 which seems reasonable behaviour.
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470 */
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471 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
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472 Py_FatalError("Couldn't create autoTLSkey mapping");
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473
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474 /* PyGILState_Release must not try to delete this thread state. */
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475 tstate->gilstate_counter = 1;
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476 }
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diff changeset
477
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478 /* The public functions */
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479 PyThreadState *
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480 PyGILState_GetThisThreadState(void)
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481 {
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482 if (autoInterpreterState == NULL || autoTLSkey == 0)
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483 return NULL;
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484 return (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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485 }
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diff changeset
486
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487 PyGILState_STATE
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488 PyGILState_Ensure(void)
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489 {
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diff changeset
490 int current;
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491 PyThreadState *tcur;
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090ffcb83f0a Trim trailing whitespace.
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492 /* Note that we do not auto-init Python here - apart from
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493 potential races with 2 threads auto-initializing, pep-311
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494 spells out other issues. Embedders are expected to have
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495 called Py_Initialize() and usually PyEval_InitThreads().
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496 */
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497 assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
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498 tcur = PyThread_get_key_value(autoTLSkey);
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499 if (tcur == NULL) {
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500 /* Create a new thread state for this thread */
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501 tcur = PyThreadState_New(autoInterpreterState);
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502 if (tcur == NULL)
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503 Py_FatalError("Couldn't create thread-state for new thread");
35631
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504 /* This is our thread state! We'll need to delete it in the
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diff changeset
505 matching call to PyGILState_Release(). */
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diff changeset
506 tcur->gilstate_counter = 0;
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507 current = 0; /* new thread state is never current */
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508 }
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509 else
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510 current = PyThreadState_IsCurrent(tcur);
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diff changeset
511 if (current == 0)
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512 PyEval_RestoreThread(tcur);
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diff changeset
513 /* Update our counter in the thread-state - no need for locks:
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514 - tcur will remain valid as we hold the GIL.
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515 - the counter is safe as we are the only thread "allowed"
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516 to modify this value
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517 */
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518 ++tcur->gilstate_counter;
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519 return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
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520 }
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521
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522 void
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diff changeset
523 PyGILState_Release(PyGILState_STATE oldstate)
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524 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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525 PyThreadState *tcur = PyThread_get_key_value(autoTLSkey);
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526 if (tcur == NULL)
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diff changeset
527 Py_FatalError("auto-releasing thread-state, "
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
528 "but no thread-state for this thread");
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diff changeset
529 /* We must hold the GIL and have our thread state current */
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530 /* XXX - remove the check - the assert should be fine,
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531 but while this is very new (April 2003), the extra check
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532 by release-only users can't hurt.
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533 */
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534 if (! PyThreadState_IsCurrent(tcur))
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535 Py_FatalError("This thread state must be current when releasing");
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536 assert(PyThreadState_IsCurrent(tcur));
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537 --tcur->gilstate_counter;
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538 assert(tcur->gilstate_counter >= 0); /* illegal counter value */
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539
33940
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540 /* If we're going to destroy this thread-state, we must
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parents: 33714
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541 * clear it while the GIL is held, as destructors may run.
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542 */
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543 if (tcur->gilstate_counter == 0) {
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544 /* can't have been locked when we created it */
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545 assert(oldstate == PyGILState_UNLOCKED);
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546 PyThreadState_Clear(tcur);
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547 /* Delete the thread-state. Note this releases the GIL too!
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548 * It's vital that the GIL be held here, to avoid shutdown
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549 * races; see bugs 225673 and 1061968 (that nasty bug has a
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550 * habit of coming back).
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551 */
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552 PyThreadState_DeleteCurrent();
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553 }
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554 /* Release the lock if necessary */
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555 else if (oldstate == PyGILState_UNLOCKED)
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556 PyEval_SaveThread();
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557 }
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558 #endif /* WITH_THREAD */