Mercurial > cpython-lru_cache-weakref

annotate Python/pystate.c @ 37468:04afb3650847 legacy-trunk

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Generate line number table entries for except handlers. Re-enable all the tests in test_trace.py except one. Still not sure that these tests test what they used to test, but they pass. One failing test seems to be caused by undocumented line number table behavior in Python 2.4.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Tue, 04 Apr 2006 14:26:39 +0000
parents da2a1049215d
children f448d0075691 f731859e9b3b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Thread and interpreter state structures and their interfaces */
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3
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4 #include "Python.h"
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5
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6 /* --------------------------------------------------------------------------
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7 CAUTION
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8
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9 Always use malloc() and free() directly in this file. A number of these
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10 functions are advertised as safe to call when the GIL isn't held, and in
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11 a debug build Python redirects (e.g.) PyMem_NEW (etc) to Python's debugging
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12 obmalloc functions. Those aren't thread-safe (they rely on the GIL to avoid
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13 the expense of doing their own locking).
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14 -------------------------------------------------------------------------- */
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15
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16 #ifdef HAVE_DLOPEN
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17 #ifdef HAVE_DLFCN_H
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18 #include <dlfcn.h>
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19 #endif
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20 #ifndef RTLD_LAZY
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21 #define RTLD_LAZY 1
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22 #endif
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23 #endif
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24
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25
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26 #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 interp->modules = NULL;
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70 interp->sysdict = NULL;
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71 interp->builtins = NULL;
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72 interp->tstate_head = NULL;
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73 interp->codec_search_path = NULL;
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74 interp->codec_search_cache = NULL;
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75 interp->codec_error_registry = NULL;
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76 #ifdef HAVE_DLOPEN
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77 #ifdef RTLD_NOW
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78 interp->dlopenflags = RTLD_NOW;
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79 #else
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80 interp->dlopenflags = RTLD_LAZY;
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81 #endif
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82 #endif
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83 #ifdef WITH_TSC
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84 interp->tscdump = 0;
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85 #endif
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86
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87 HEAD_LOCK();
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88 interp->next = interp_head;
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89 interp_head = interp;
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90 HEAD_UNLOCK();
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91 }
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92
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93 return interp;
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94 }
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95
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96
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97 void
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98 PyInterpreterState_Clear(PyInterpreterState *interp)
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99 {
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100 PyThreadState *p;
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101 HEAD_LOCK();
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102 for (p = interp->tstate_head; p != NULL; p = p->next)
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103 PyThreadState_Clear(p);
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104 HEAD_UNLOCK();
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105 ZAP(interp->codec_search_path);
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106 ZAP(interp->codec_search_cache);
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107 ZAP(interp->codec_error_registry);
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108 ZAP(interp->modules);
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109 ZAP(interp->sysdict);
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110 ZAP(interp->builtins);
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111 }
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112
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113
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114 static void
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115 zapthreads(PyInterpreterState *interp)
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116 {
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117 PyThreadState *p;
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118 /* No need to lock the mutex here because this should only happen
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119 when the threads are all really dead (XXX famous last words). */
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120 while ((p = interp->tstate_head) != NULL) {
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121 PyThreadState_Delete(p);
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122 }
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123 }
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124
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125
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126 void
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127 PyInterpreterState_Delete(PyInterpreterState *interp)
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128 {
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129 PyInterpreterState **p;
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130 zapthreads(interp);
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ca7316a00464 PyInterpreterState_New is not thread-safe, and the recent fix to _PyPclose
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parents: 14375
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131 HEAD_LOCK();
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diff changeset
132 for (p = &interp_head; ; p = &(*p)->next) {
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diff changeset
133 if (*p == NULL)
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diff changeset
134 Py_FatalError(
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diff changeset
135 "PyInterpreterState_Delete: invalid interp");
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diff changeset
136 if (*p == interp)
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diff changeset
137 break;
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diff changeset
138 }
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diff changeset
139 if (interp->tstate_head != NULL)
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140 Py_FatalError("PyInterpreterState_Delete: remaining threads");
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141 *p = interp->next;
14378
ca7316a00464 PyInterpreterState_New is not thread-safe, and the recent fix to _PyPclose
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parents: 14375
diff changeset
142 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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diff changeset
143 free(interp);
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144 }
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parents:
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145
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parents:
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146
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diff changeset
147 /* Default implementation for _PyThreadState_GetFrame */
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parents: 25111
diff changeset
148 static struct _frame *
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diff changeset
149 threadstate_getframe(PyThreadState *self)
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diff changeset
150 {
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diff changeset
151 return self->frame;
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diff changeset
152 }
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153
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154 PyThreadState *
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Thomas Wouters <thomas@python.org>
parents: 13256
diff changeset
155 PyThreadState_New(PyInterpreterState *interp)
5405
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156 {
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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157 PyThreadState *tstate = (PyThreadState *)malloc(sizeof(PyThreadState));
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
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diff changeset
158
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diff changeset
159 if (_PyThreadState_GetFrame == NULL)
27978
4b99a701defe - PyEval_GetFrame() is now declared to return a PyFrameObject *
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160 _PyThreadState_GetFrame = threadstate_getframe;
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161
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162 if (tstate != NULL) {
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163 tstate->interp = interp;
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164
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165 tstate->frame = NULL;
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166 tstate->recursion_depth = 0;
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167 tstate->tracing = 0;
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168 tstate->use_tracing = 0;
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169 tstate->tick_counter = 0;
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
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170 tstate->gilstate_counter = 0;
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
171 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
diff changeset
172 #ifdef WITH_THREAD
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
173 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>
parents: 29643
diff changeset
174 #else
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
175 tstate->thread_id = 0;
014cc362aa91 Initialize thread_id to 0 in unthreaded build. Fixes #770247.
Martin v. Löwis <martin@v.loewis.de>
parents: 29643
diff changeset
176 #endif
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177
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178 tstate->dict = NULL;
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179
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180 tstate->curexc_type = NULL;
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181 tstate->curexc_value = NULL;
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182 tstate->curexc_traceback = NULL;
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parents:
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183
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184 tstate->exc_type = NULL;
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185 tstate->exc_value = NULL;
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186 tstate->exc_traceback = NULL;
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187
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e427afb5637f Revise the interface to the profiling and tracing support for the
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diff changeset
188 tstate->c_profilefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
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diff changeset
189 tstate->c_tracefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
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diff changeset
190 tstate->c_profileobj = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
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diff changeset
191 tstate->c_traceobj = NULL;
5926
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diff changeset
192
35661
85651eb3d9a9 Forward port bugfix:
Michael W. Hudson <mwh@python.net>
parents: 35117
diff changeset
193 #ifdef WITH_THREAD
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
194 _PyGILState_NoteThreadState(tstate);
35661
85651eb3d9a9 Forward port bugfix:
Michael W. Hudson <mwh@python.net>
parents: 35117
diff changeset
195 #endif
35117
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
196
11011
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197 HEAD_LOCK();
5926
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diff changeset
198 tstate->next = interp->tstate_head;
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199 interp->tstate_head = tstate;
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200 HEAD_UNLOCK();
5926
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201 }
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202
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diff changeset
203 return tstate;
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diff changeset
204 }
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diff changeset
205
5405
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206
5926
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diff changeset
207 void
13658
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Thomas Wouters <thomas@python.org>
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diff changeset
208 PyThreadState_Clear(PyThreadState *tstate)
5926
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diff changeset
209 {
6549
a8e3b2e9f5d2 The warning about thread still having a frame now only happens in
Guido van Rossum <guido@python.org>
parents: 6124
diff changeset
210 if (Py_VerboseFlag && tstate->frame != NULL)
5926
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diff changeset
211 fprintf(stderr,
6124
cc2c84769636 Added missing newline to warning msg
Guido van Rossum <guido@python.org>
parents: 5926
diff changeset
212 "PyThreadState_Clear: warning: thread still has a frame\n");
5926
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diff changeset
213
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diff changeset
214 ZAP(tstate->frame);
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diff changeset
215
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
216 ZAP(tstate->dict);
29643
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
Guido van Rossum <guido@python.org>
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diff changeset
217 ZAP(tstate->async_exc);
7970
4ceee1ef99b0 /* An extension mechanism to store arbitrary additional per-thread state.
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diff changeset
218
5926
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diff changeset
219 ZAP(tstate->curexc_type);
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diff changeset
220 ZAP(tstate->curexc_value);
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diff changeset
221 ZAP(tstate->curexc_traceback);
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Guido van Rossum <guido@python.org>
parents: 5849
diff changeset
222
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diff changeset
223 ZAP(tstate->exc_type);
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diff changeset
224 ZAP(tstate->exc_value);
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diff changeset
225 ZAP(tstate->exc_traceback);
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diff changeset
226
18326
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
227 tstate->c_profilefunc = NULL;
e427afb5637f Revise the interface to the profiling and tracing support for the
Fred Drake <fdrake@acm.org>
parents: 16139
diff changeset
228 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
229 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
230 ZAP(tstate->c_traceobj);
5405
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 }
b7871ca930ad Massive changes for separate thread state management.
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parents:
diff changeset
232
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
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diff changeset
233
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
234 /* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
235 static void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
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diff changeset
236 tstate_delete_common(PyThreadState *tstate)
5405
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parents:
diff changeset
237 {
5926
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diff changeset
238 PyInterpreterState *interp;
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diff changeset
239 PyThreadState **p;
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diff changeset
240 if (tstate == NULL)
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diff changeset
241 Py_FatalError("PyThreadState_Delete: NULL tstate");
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diff changeset
242 interp = tstate->interp;
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diff changeset
243 if (interp == NULL)
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diff changeset
244 Py_FatalError("PyThreadState_Delete: NULL interp");
11011
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diff changeset
245 HEAD_LOCK();
5926
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diff changeset
246 for (p = &interp->tstate_head; ; p = &(*p)->next) {
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diff changeset
247 if (*p == NULL)
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diff changeset
248 Py_FatalError(
8d2194e22e67 The last of the mass checkins for separate (sub)interpreters.
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diff changeset
249 "PyThreadState_Delete: invalid tstate");
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diff changeset
250 if (*p == tstate)
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diff changeset
251 break;
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diff changeset
252 }
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diff changeset
253 *p = tstate->next;
11011
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parents: 9667
diff changeset
254 HEAD_UNLOCK();
33713
517e4ec0df89 PyInterpreterState_New(), PyThreadState_New(): use malloc/free directly.
Tim Peters <tim.peters@gmail.com>
parents: 33711
diff changeset
255 free(tstate);
5405
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
256 }
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
257
b7871ca930ad Massive changes for separate thread state management.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258
16139
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
259 void
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
260 PyThreadState_Delete(PyThreadState *tstate)
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
261 {
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
262 if (tstate == _PyThreadState_Current)
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
263 Py_FatalError("PyThreadState_Delete: tstate is still current");
d96ce9708c00 Add a new API, PyThreadState_DeleteCurrent() that combines
Guido van Rossum <guido@python.org>
parents: 14378
diff changeset
264 tstate_delete_common(tstate);
36683
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
265 #ifdef WITH_THREAD
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
266 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
da2a1049215d Patch 1413181, by Gabriel Becedillas.
Tim Peters <tim.peters@gmail.com>
parents: 35661
diff changeset
267 PyThread_delete_key_value(autoTLSkey);
da2a1049215d Patch 1413181, by Gabriel Becedillas.
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268 #endif /* WITH_THREAD */
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269 }
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270
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271
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272 #ifdef WITH_THREAD
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273 void
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274 PyThreadState_DeleteCurrent()
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275 {
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276 PyThreadState *tstate = _PyThreadState_Current;
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277 if (tstate == NULL)
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278 Py_FatalError(
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279 "PyThreadState_DeleteCurrent: no current tstate");
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280 _PyThreadState_Current = NULL;
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281 tstate_delete_common(tstate);
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282 if (autoTLSkey && PyThread_get_key_value(autoTLSkey) == tstate)
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283 PyThread_delete_key_value(autoTLSkey);
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284 PyEval_ReleaseLock();
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285 }
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286 #endif /* WITH_THREAD */
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287
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288
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289 PyThreadState *
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290 PyThreadState_Get(void)
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291 {
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292 if (_PyThreadState_Current == NULL)
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293 Py_FatalError("PyThreadState_Get: no current thread");
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294
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295 return _PyThreadState_Current;
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296 }
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297
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298
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299 PyThreadState *
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300 PyThreadState_Swap(PyThreadState *new)
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301 {
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302 PyThreadState *old = _PyThreadState_Current;
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303
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304 _PyThreadState_Current = new;
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305 /* It should not be possible for more than one thread state
33698
090ffcb83f0a Trim trailing whitespace.
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306 to be used for a thread. Check this the best we can in debug
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307 builds.
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308 */
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diff changeset
309 #if defined(Py_DEBUG) && defined(WITH_THREAD)
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310 if (new) {
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diff changeset
311 PyThreadState *check = PyGILState_GetThisThreadState();
35095
8341cefdecac You can have more than one thread state for a thread if they
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312 if (check && check->interp == new->interp && check != new)
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313 Py_FatalError("Invalid thread state for this thread");
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314 }
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315 #endif
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316 return old;
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317 }
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318
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319 /* An extension mechanism to store arbitrary additional per-thread state.
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320 PyThreadState_GetDict() returns a dictionary that can be used to hold such
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321 state; the caller should pick a unique key and store its state there. If
28616
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322 PyThreadState_GetDict() returns NULL, an exception has *not* been raised
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323 and the caller should assume no per-thread state is available. */
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324
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325 PyObject *
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326 PyThreadState_GetDict(void)
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327 {
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328 if (_PyThreadState_Current == NULL)
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329 return NULL;
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330
28616
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331 if (_PyThreadState_Current->dict == NULL) {
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332 PyObject *d;
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333 _PyThreadState_Current->dict = d = PyDict_New();
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334 if (d == NULL)
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335 PyErr_Clear();
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336 }
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337 return _PyThreadState_Current->dict;
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338 }
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339
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340
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341 /* Asynchronously raise an exception in a thread.
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342 Requested by Just van Rossum and Alex Martelli.
34568
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343 To prevent naive misuse, you must write your own extension
29643
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344 to call this. Must be called with the GIL held.
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345 Returns the number of tstates modified; if it returns a number
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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346 greater than one, you're in trouble, and you should call it again
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
347 with exc=NULL to revert the effect. This raises no exceptions. */
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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348
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
349 int
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
350 PyThreadState_SetAsyncExc(long id, PyObject *exc) {
31797
846b3ee7e106 Changed random calls to PyThreadState_Get() to use the macro
Nicholas Bastin <nick.bastin@gmail.com>
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diff changeset
351 PyThreadState *tstate = PyThreadState_GET();
29643
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352 PyInterpreterState *interp = tstate->interp;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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353 PyThreadState *p;
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354 int count = 0;
34568
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355 HEAD_LOCK();
29643
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356 for (p = interp->tstate_head; p != NULL; p = p->next) {
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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357 if (p->thread_id != id)
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
358 continue;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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359 ZAP(p->async_exc);
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
360 Py_XINCREF(exc);
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
361 p->async_exc = exc;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
362 count += 1;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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diff changeset
363 }
34568
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diff changeset
364 HEAD_UNLOCK();
29643
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365 return count;
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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366 }
fa97293533a9 Add PyThreadState_SetAsyncExc(long, PyObject *).
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367
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368
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369 /* Routines for advanced debuggers, requested by David Beazley.
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370 Don't use unless you know what you are doing! */
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371
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372 PyInterpreterState *
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373 PyInterpreterState_Head(void)
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374 {
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375 return interp_head;
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diff changeset
376 }
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377
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378 PyInterpreterState *
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379 PyInterpreterState_Next(PyInterpreterState *interp) {
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380 return interp->next;
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381 }
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382
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383 PyThreadState *
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384 PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
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385 return interp->tstate_head;
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386 }
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387
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388 PyThreadState *
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389 PyThreadState_Next(PyThreadState *tstate) {
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390 return tstate->next;
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diff changeset
391 }
28694
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392
29643
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diff changeset
393
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diff changeset
394 /* Python "auto thread state" API. */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
395 #ifdef WITH_THREAD
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diff changeset
396
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
397 /* Keep this as a static, as it is not reliable! It can only
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
398 ever be compared to the state for the *current* thread.
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399 * If not equal, then it doesn't matter that the actual
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400 value may change immediately after comparison, as it can't
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401 possibly change to the current thread's state.
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402 * If equal, then the current thread holds the lock, so the value can't
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diff changeset
403 change until we yield the lock.
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404 */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
405 static int
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
406 PyThreadState_IsCurrent(PyThreadState *tstate)
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407 {
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408 /* Must be the tstate for this thread */
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409 assert(PyGILState_GetThisThreadState()==tstate);
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410 /* On Windows at least, simple reads and writes to 32 bit values
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diff changeset
411 are atomic.
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diff changeset
412 */
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413 return tstate == _PyThreadState_Current;
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414 }
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415
33698
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416 /* Internal initialization/finalization functions called by
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417 Py_Initialize/Py_Finalize
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418 */
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419 void
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420 _PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
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421 {
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422 assert(i && t); /* must init with valid states */
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423 autoTLSkey = PyThread_create_key();
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424 autoInterpreterState = i;
33706
4981ba54f43d _PyGILState_Init(), PyGILState_Ensure(): Since PyThread_set_key_value()
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425 assert(PyThread_get_key_value(autoTLSkey) == NULL);
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426 assert(t->gilstate_counter == 0);
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427
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428 _PyGILState_NoteThreadState(t);
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429 }
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430
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431 void
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432 _PyGILState_Fini(void)
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433 {
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434 PyThread_delete_key(autoTLSkey);
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435 autoTLSkey = 0;
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436 autoInterpreterState = NULL;;
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437 }
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438
35117
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Michael W. Hudson <mwh@python.net>
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439 /* When a thread state is created for a thread by some mechanism other than
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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440 PyGILState_Ensure, it's important that the GILState machinery knows about
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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441 it so it doesn't try to create another thread state for the thread (this is
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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442 a better fix for SF bug #1010677 than the first one attempted).
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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443 */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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444 void
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445 _PyGILState_NoteThreadState(PyThreadState* tstate)
7ea2be2c0e1d Fix bug:
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446 {
7ea2be2c0e1d Fix bug:
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parents: 35095
diff changeset
447 /* If autoTLSkey is 0, this must be the very first threadstate created
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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448 in Py_Initialize(). Don't do anything for now (we'll be back here
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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449 when _PyGILState_Init is called). */
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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450 if (!autoTLSkey)
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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451 return;
7ea2be2c0e1d Fix bug:
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452
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453 /* Stick the thread state for this thread in thread local storage.
7ea2be2c0e1d Fix bug:
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diff changeset
454
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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455 The only situation where you can legitimately have more than one
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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456 thread state for an OS level thread is when there are multiple
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
457 interpreters, when:
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
458
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
459 a) You shouldn't really be using the PyGILState_ APIs anyway,
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
460 and:
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
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461
7ea2be2c0e1d Fix bug:
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diff changeset
462 b) The slightly odd way PyThread_set_key_value works (see
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
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diff changeset
463 comments by its implementation) means that the first thread
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
464 state created for that given OS level thread will "win",
7ea2be2c0e1d Fix bug:
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diff changeset
465 which seems reasonable behaviour.
7ea2be2c0e1d Fix bug:
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diff changeset
466 */
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Michael W. Hudson <mwh@python.net>
parents: 35095
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467 if (PyThread_set_key_value(autoTLSkey, (void *)tstate) < 0)
7ea2be2c0e1d Fix bug:
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468 Py_FatalError("Couldn't create autoTLSkey mapping");
7ea2be2c0e1d Fix bug:
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diff changeset
469
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diff changeset
470 /* PyGILState_Release must not try to delete this thread state. */
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471 tstate->gilstate_counter = 1;
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472 }
7ea2be2c0e1d Fix bug:
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diff changeset
473
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474 /* The public functions */
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475 PyThreadState *
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476 PyGILState_GetThisThreadState(void)
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
477 {
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478 if (autoInterpreterState == NULL || autoTLSkey == 0)
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479 return NULL;
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480 return (PyThreadState *)PyThread_get_key_value(autoTLSkey);
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481 }
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482
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483 PyGILState_STATE
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484 PyGILState_Ensure(void)
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diff changeset
485 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
486 int current;
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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487 PyThreadState *tcur;
33698
090ffcb83f0a Trim trailing whitespace.
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488 /* Note that we do not auto-init Python here - apart from
090ffcb83f0a Trim trailing whitespace.
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diff changeset
489 potential races with 2 threads auto-initializing, pep-311
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490 spells out other issues. Embedders are expected to have
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
491 called Py_Initialize() and usually PyEval_InitThreads().
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diff changeset
492 */
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diff changeset
493 assert(autoInterpreterState); /* Py_Initialize() hasn't been called! */
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diff changeset
494 tcur = PyThread_get_key_value(autoTLSkey);
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diff changeset
495 if (tcur == NULL) {
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496 /* Create a new thread state for this thread */
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diff changeset
497 tcur = PyThreadState_New(autoInterpreterState);
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498 if (tcur == NULL)
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diff changeset
499 Py_FatalError("Couldn't create thread-state for new thread");
35117
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Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
500 /* This is our thread state! We'll need to delete it in the
7ea2be2c0e1d Fix bug:
Michael W. Hudson <mwh@python.net>
parents: 35095
diff changeset
501 matching call to PyGILState_Release(). */
7ea2be2c0e1d Fix bug:
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diff changeset
502 tcur->gilstate_counter = 0;
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diff changeset
503 current = 0; /* new thread state is never current */
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504 }
0c26db381673 Style guide & consistency changes. No semantic changes.
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parents: 33698
diff changeset
505 else
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diff changeset
506 current = PyThreadState_IsCurrent(tcur);
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Tim Peters <tim.peters@gmail.com>
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diff changeset
507 if (current == 0)
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diff changeset
508 PyEval_RestoreThread(tcur);
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
509 /* Update our counter in the thread-state - no need for locks:
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
510 - tcur will remain valid as we hold the GIL.
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diff changeset
511 - the counter is safe as we are the only thread "allowed"
28694
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diff changeset
512 to modify this value
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
513 */
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diff changeset
514 ++tcur->gilstate_counter;
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515 return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
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diff changeset
516 }
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diff changeset
517
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diff changeset
518 void
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
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diff changeset
519 PyGILState_Release(PyGILState_STATE oldstate)
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diff changeset
520 {
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
521 PyThreadState *tcur = PyThread_get_key_value(autoTLSkey);
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diff changeset
522 if (tcur == NULL)
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
523 Py_FatalError("auto-releasing thread-state, "
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
524 "but no thread-state for this thread");
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
525 /* We must hold the GIL and have our thread state current */
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
526 /* XXX - remove the check - the assert should be fine,
33698
090ffcb83f0a Trim trailing whitespace.
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diff changeset
527 but while this is very new (April 2003), the extra check
28694
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
528 by release-only users can't hurt.
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diff changeset
529 */
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diff changeset
530 if (! PyThreadState_IsCurrent(tcur))
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
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diff changeset
531 Py_FatalError("This thread state must be current when releasing");
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
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532 assert(PyThreadState_IsCurrent(tcur));
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
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533 --tcur->gilstate_counter;
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
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534 assert(tcur->gilstate_counter >= 0); /* illegal counter value */
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
535
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
536 /* If we're going to destroy this thread-state, we must
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
537 * clear it while the GIL is held, as destructors may run.
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
538 */
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0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
539 if (tcur->gilstate_counter == 0) {
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
540 /* can't have been locked when we created it */
33699
0c26db381673 Style guide & consistency changes. No semantic changes.
Tim Peters <tim.peters@gmail.com>
parents: 33698
diff changeset
541 assert(oldstate == PyGILState_UNLOCKED);
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a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
542 PyThreadState_Clear(tcur);
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
543 /* Delete the thread-state. Note this releases the GIL too!
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
544 * It's vital that the GIL be held here, to avoid shutdown
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
545 * races; see bugs 225673 and 1061968 (that nasty bug has a
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
546 * habit of coming back).
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
547 */
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
548 PyThreadState_DeleteCurrent();
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Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
549 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
550 /* Release the lock if necessary */
33940
dfd07b7be407 SF bug 1061968: threads: segfault or Py_FatalError at exit
Tim Peters <tim.peters@gmail.com>
parents: 33714
diff changeset
551 else if (oldstate == PyGILState_UNLOCKED)
34928
9857daa22807 Backport my recent fix (rev. 2.40 of Python/pystate.c):
Michael W. Hudson <mwh@python.net>
parents: 34568
diff changeset
552 PyEval_SaveThread();
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Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
553 }
a4154dd5939a New PyGILState_ API - implements pep 311, from patch 684256.
Mark Hammond <mhammond@skippinet.com.au>
parents: 28616
diff changeset
554 #endif /* WITH_THREAD */