1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
|
/* Thread and interpreter state structures and their interfaces */
#include "Python.h"
#include "pycore_coreconfig.h"
#include "pycore_pymem.h"
#include "pycore_pystate.h"
#define _PyThreadState_SET(value) \
_Py_atomic_store_relaxed(&_PyRuntime.gilstate.tstate_current, \
(uintptr_t)(value))
/* --------------------------------------------------------------------------
CAUTION
Always use PyMem_RawMalloc() and PyMem_RawFree() directly in this file. A
number of these functions are advertised as safe to call when the GIL isn't
held, and in a debug build Python redirects (e.g.) PyMem_NEW (etc) to Python's
debugging obmalloc functions. Those aren't thread-safe (they rely on the GIL
to avoid the expense of doing their own locking).
-------------------------------------------------------------------------- */
#ifdef HAVE_DLOPEN
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#if !HAVE_DECL_RTLD_LAZY
#define RTLD_LAZY 1
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
static _PyInitError
_PyRuntimeState_Init_impl(_PyRuntimeState *runtime)
{
memset(runtime, 0, sizeof(*runtime));
_PyGC_Initialize(&runtime->gc);
_PyEval_Initialize(&runtime->ceval);
runtime->gilstate.check_enabled = 1;
/* A TSS key must be initialized with Py_tss_NEEDS_INIT
in accordance with the specification. */
Py_tss_t initial = Py_tss_NEEDS_INIT;
runtime->gilstate.autoTSSkey = initial;
runtime->interpreters.mutex = PyThread_allocate_lock();
if (runtime->interpreters.mutex == NULL) {
return _Py_INIT_ERR("Can't initialize threads for interpreter");
}
runtime->interpreters.next_id = -1;
runtime->xidregistry.mutex = PyThread_allocate_lock();
if (runtime->xidregistry.mutex == NULL) {
return _Py_INIT_ERR("Can't initialize threads for cross-interpreter data registry");
}
// runtime->main_thread is set in PyEval_InitThreads().
return _Py_INIT_OK();
}
_PyInitError
_PyRuntimeState_Init(_PyRuntimeState *runtime)
{
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyInitError err = _PyRuntimeState_Init_impl(runtime);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return err;
}
void
_PyRuntimeState_Fini(_PyRuntimeState *runtime)
{
/* Force the allocator used by _PyRuntimeState_Init(). */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (runtime->interpreters.mutex != NULL) {
PyThread_free_lock(runtime->interpreters.mutex);
runtime->interpreters.mutex = NULL;
}
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
}
#define HEAD_LOCK() PyThread_acquire_lock(_PyRuntime.interpreters.mutex, \
WAIT_LOCK)
#define HEAD_UNLOCK() PyThread_release_lock(_PyRuntime.interpreters.mutex)
static void _PyGILState_NoteThreadState(PyThreadState* tstate);
_PyInitError
_PyInterpreterState_Enable(_PyRuntimeState *runtime)
{
runtime->interpreters.next_id = 0;
/* Py_Finalize() calls _PyRuntimeState_Fini() which clears the mutex.
Create a new mutex if needed. */
if (runtime->interpreters.mutex == NULL) {
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
runtime->interpreters.mutex = PyThread_allocate_lock();
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (runtime->interpreters.mutex == NULL) {
return _Py_INIT_ERR("Can't initialize threads for interpreter");
}
}
return _Py_INIT_OK();
}
PyInterpreterState *
PyInterpreterState_New(void)
{
PyInterpreterState *interp = (PyInterpreterState *)
PyMem_RawMalloc(sizeof(PyInterpreterState));
if (interp == NULL) {
return NULL;
}
memset(interp, 0, sizeof(*interp));
interp->id_refcount = -1;
interp->check_interval = 100;
interp->core_config = _PyCoreConfig_INIT;
interp->config = _PyMainInterpreterConfig_INIT;
interp->eval_frame = _PyEval_EvalFrameDefault;
#ifdef HAVE_DLOPEN
#if HAVE_DECL_RTLD_NOW
interp->dlopenflags = RTLD_NOW;
#else
interp->dlopenflags = RTLD_LAZY;
#endif
#endif
HEAD_LOCK();
if (_PyRuntime.interpreters.next_id < 0) {
/* overflow or Py_Initialize() not called! */
PyErr_SetString(PyExc_RuntimeError,
"failed to get an interpreter ID");
PyMem_RawFree(interp);
interp = NULL;
} else {
interp->id = _PyRuntime.interpreters.next_id;
_PyRuntime.interpreters.next_id += 1;
interp->next = _PyRuntime.interpreters.head;
if (_PyRuntime.interpreters.main == NULL) {
_PyRuntime.interpreters.main = interp;
}
_PyRuntime.interpreters.head = interp;
}
HEAD_UNLOCK();
if (interp == NULL) {
return NULL;
}
interp->tstate_next_unique_id = 0;
return interp;
}
void
PyInterpreterState_Clear(PyInterpreterState *interp)
{
PyThreadState *p;
HEAD_LOCK();
for (p = interp->tstate_head; p != NULL; p = p->next)
PyThreadState_Clear(p);
HEAD_UNLOCK();
_PyCoreConfig_Clear(&interp->core_config);
_PyMainInterpreterConfig_Clear(&interp->config);
Py_CLEAR(interp->codec_search_path);
Py_CLEAR(interp->codec_search_cache);
Py_CLEAR(interp->codec_error_registry);
Py_CLEAR(interp->modules);
Py_CLEAR(interp->modules_by_index);
Py_CLEAR(interp->sysdict);
Py_CLEAR(interp->builtins);
Py_CLEAR(interp->builtins_copy);
Py_CLEAR(interp->importlib);
Py_CLEAR(interp->import_func);
#ifdef HAVE_FORK
Py_CLEAR(interp->before_forkers);
Py_CLEAR(interp->after_forkers_parent);
Py_CLEAR(interp->after_forkers_child);
#endif
// XXX Once we have one allocator per interpreter (i.e.
// per-interpreter GC) we must ensure that all of the interpreter's
// objects have been cleaned up at the point.
}
static void
zapthreads(PyInterpreterState *interp)
{
PyThreadState *p;
/* No need to lock the mutex here because this should only happen
when the threads are all really dead (XXX famous last words). */
while ((p = interp->tstate_head) != NULL) {
PyThreadState_Delete(p);
}
}
void
PyInterpreterState_Delete(PyInterpreterState *interp)
{
PyInterpreterState **p;
zapthreads(interp);
HEAD_LOCK();
for (p = &_PyRuntime.interpreters.head; ; p = &(*p)->next) {
if (*p == NULL)
Py_FatalError(
"PyInterpreterState_Delete: invalid interp");
if (*p == interp)
break;
}
if (interp->tstate_head != NULL)
Py_FatalError("PyInterpreterState_Delete: remaining threads");
*p = interp->next;
if (_PyRuntime.interpreters.main == interp) {
_PyRuntime.interpreters.main = NULL;
if (_PyRuntime.interpreters.head != NULL)
Py_FatalError("PyInterpreterState_Delete: remaining subinterpreters");
}
HEAD_UNLOCK();
if (interp->id_mutex != NULL) {
PyThread_free_lock(interp->id_mutex);
}
PyMem_RawFree(interp);
}
/*
* Delete all interpreter states except the main interpreter. If there
* is a current interpreter state, it *must* be the main interpreter.
*/
void
_PyInterpreterState_DeleteExceptMain()
{
PyThreadState *tstate = PyThreadState_Swap(NULL);
if (tstate != NULL && tstate->interp != _PyRuntime.interpreters.main) {
Py_FatalError("PyInterpreterState_DeleteExceptMain: not main interpreter");
}
HEAD_LOCK();
PyInterpreterState *interp = _PyRuntime.interpreters.head;
_PyRuntime.interpreters.head = NULL;
while (interp != NULL) {
if (interp == _PyRuntime.interpreters.main) {
_PyRuntime.interpreters.main->next = NULL;
_PyRuntime.interpreters.head = interp;
interp = interp->next;
continue;
}
PyInterpreterState_Clear(interp); // XXX must activate?
zapthreads(interp);
if (interp->id_mutex != NULL) {
PyThread_free_lock(interp->id_mutex);
}
PyInterpreterState *prev_interp = interp;
interp = interp->next;
PyMem_RawFree(prev_interp);
}
HEAD_UNLOCK();
if (_PyRuntime.interpreters.head == NULL) {
Py_FatalError("PyInterpreterState_DeleteExceptMain: missing main");
}
PyThreadState_Swap(tstate);
}
PyInterpreterState *
_PyInterpreterState_Get(void)
{
PyThreadState *tstate = _PyThreadState_GET();
if (tstate == NULL) {
Py_FatalError("_PyInterpreterState_Get(): no current thread state");
}
PyInterpreterState *interp = tstate->interp;
if (interp == NULL) {
Py_FatalError("_PyInterpreterState_Get(): no current interpreter");
}
return interp;
}
int64_t
PyInterpreterState_GetID(PyInterpreterState *interp)
{
if (interp == NULL) {
PyErr_SetString(PyExc_RuntimeError, "no interpreter provided");
return -1;
}
return interp->id;
}
static PyInterpreterState *
interp_look_up_id(PY_INT64_T requested_id)
{
PyInterpreterState *interp = PyInterpreterState_Head();
while (interp != NULL) {
PY_INT64_T id = PyInterpreterState_GetID(interp);
if (id < 0) {
return NULL;
}
if (requested_id == id) {
return interp;
}
interp = PyInterpreterState_Next(interp);
}
return NULL;
}
PyInterpreterState *
_PyInterpreterState_LookUpID(PY_INT64_T requested_id)
{
PyInterpreterState *interp = NULL;
if (requested_id >= 0) {
HEAD_LOCK();
interp = interp_look_up_id(requested_id);
HEAD_UNLOCK();
}
if (interp == NULL && !PyErr_Occurred()) {
PyErr_Format(PyExc_RuntimeError,
"unrecognized interpreter ID %lld", requested_id);
}
return interp;
}
int
_PyInterpreterState_IDInitref(PyInterpreterState *interp)
{
if (interp->id_mutex != NULL) {
return 0;
}
interp->id_mutex = PyThread_allocate_lock();
if (interp->id_mutex == NULL) {
PyErr_SetString(PyExc_RuntimeError,
"failed to create init interpreter ID mutex");
return -1;
}
interp->id_refcount = 0;
return 0;
}
void
_PyInterpreterState_IDIncref(PyInterpreterState *interp)
{
if (interp->id_mutex == NULL) {
return;
}
PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
interp->id_refcount += 1;
PyThread_release_lock(interp->id_mutex);
}
void
_PyInterpreterState_IDDecref(PyInterpreterState *interp)
{
if (interp->id_mutex == NULL) {
return;
}
PyThread_acquire_lock(interp->id_mutex, WAIT_LOCK);
assert(interp->id_refcount != 0);
interp->id_refcount -= 1;
int64_t refcount = interp->id_refcount;
PyThread_release_lock(interp->id_mutex);
if (refcount == 0) {
// XXX Using the "head" thread isn't strictly correct.
PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
// XXX Possible GILState issues?
PyThreadState *save_tstate = PyThreadState_Swap(tstate);
Py_EndInterpreter(tstate);
PyThreadState_Swap(save_tstate);
}
}
_PyCoreConfig *
_PyInterpreterState_GetCoreConfig(PyInterpreterState *interp)
{
return &interp->core_config;
}
_PyMainInterpreterConfig *
_PyInterpreterState_GetMainConfig(PyInterpreterState *interp)
{
return &interp->config;
}
/* Default implementation for _PyThreadState_GetFrame */
static struct _frame *
threadstate_getframe(PyThreadState *self)
{
return self->frame;
}
static PyThreadState *
new_threadstate(PyInterpreterState *interp, int init)
{
PyThreadState *tstate = (PyThreadState *)PyMem_RawMalloc(sizeof(PyThreadState));
if (_PyThreadState_GetFrame == NULL)
_PyThreadState_GetFrame = threadstate_getframe;
if (tstate != NULL) {
tstate->interp = interp;
tstate->frame = NULL;
tstate->recursion_depth = 0;
tstate->overflowed = 0;
tstate->recursion_critical = 0;
tstate->stackcheck_counter = 0;
tstate->tracing = 0;
tstate->use_tracing = 0;
tstate->gilstate_counter = 0;
tstate->async_exc = NULL;
tstate->thread_id = PyThread_get_thread_ident();
tstate->dict = NULL;
tstate->curexc_type = NULL;
tstate->curexc_value = NULL;
tstate->curexc_traceback = NULL;
tstate->exc_state.exc_type = NULL;
tstate->exc_state.exc_value = NULL;
tstate->exc_state.exc_traceback = NULL;
tstate->exc_state.previous_item = NULL;
tstate->exc_info = &tstate->exc_state;
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
tstate->c_profileobj = NULL;
tstate->c_traceobj = NULL;
tstate->trash_delete_nesting = 0;
tstate->trash_delete_later = NULL;
tstate->on_delete = NULL;
tstate->on_delete_data = NULL;
tstate->coroutine_origin_tracking_depth = 0;
tstate->coroutine_wrapper = NULL;
tstate->in_coroutine_wrapper = 0;
tstate->async_gen_firstiter = NULL;
tstate->async_gen_finalizer = NULL;
tstate->context = NULL;
tstate->context_ver = 1;
tstate->id = ++interp->tstate_next_unique_id;
if (init)
_PyThreadState_Init(tstate);
HEAD_LOCK();
tstate->prev = NULL;
tstate->next = interp->tstate_head;
if (tstate->next)
tstate->next->prev = tstate;
interp->tstate_head = tstate;
HEAD_UNLOCK();
}
return tstate;
}
PyThreadState *
PyThreadState_New(PyInterpreterState *interp)
{
return new_threadstate(interp, 1);
}
PyThreadState *
_PyThreadState_Prealloc(PyInterpreterState *interp)
{
return new_threadstate(interp, 0);
}
void
_PyThreadState_Init(PyThreadState *tstate)
{
_PyGILState_NoteThreadState(tstate);
}
PyObject*
PyState_FindModule(struct PyModuleDef* module)
{
Py_ssize_t index = module->m_base.m_index;
PyInterpreterState *state = _PyInterpreterState_GET_UNSAFE();
PyObject *res;
if (module->m_slots) {
return NULL;
}
if (index == 0)
return NULL;
if (state->modules_by_index == NULL)
return NULL;
if (index >= PyList_GET_SIZE(state->modules_by_index))
return NULL;
res = PyList_GET_ITEM(state->modules_by_index, index);
return res==Py_None ? NULL : res;
}
int
_PyState_AddModule(PyObject* module, struct PyModuleDef* def)
{
PyInterpreterState *state;
if (!def) {
assert(PyErr_Occurred());
return -1;
}
if (def->m_slots) {
PyErr_SetString(PyExc_SystemError,
"PyState_AddModule called on module with slots");
return -1;
}
state = _PyInterpreterState_GET_UNSAFE();
if (!state->modules_by_index) {
state->modules_by_index = PyList_New(0);
if (!state->modules_by_index)
return -1;
}
while(PyList_GET_SIZE(state->modules_by_index) <= def->m_base.m_index)
if (PyList_Append(state->modules_by_index, Py_None) < 0)
return -1;
Py_INCREF(module);
return PyList_SetItem(state->modules_by_index,
def->m_base.m_index, module);
}
int
PyState_AddModule(PyObject* module, struct PyModuleDef* def)
{
Py_ssize_t index;
PyInterpreterState *state = _PyInterpreterState_GET_UNSAFE();
if (!def) {
Py_FatalError("PyState_AddModule: Module Definition is NULL");
return -1;
}
index = def->m_base.m_index;
if (state->modules_by_index) {
if(PyList_GET_SIZE(state->modules_by_index) >= index) {
if(module == PyList_GET_ITEM(state->modules_by_index, index)) {
Py_FatalError("PyState_AddModule: Module already added!");
return -1;
}
}
}
return _PyState_AddModule(module, def);
}
int
PyState_RemoveModule(struct PyModuleDef* def)
{
PyInterpreterState *state;
Py_ssize_t index = def->m_base.m_index;
if (def->m_slots) {
PyErr_SetString(PyExc_SystemError,
"PyState_RemoveModule called on module with slots");
return -1;
}
state = _PyInterpreterState_GET_UNSAFE();
if (index == 0) {
Py_FatalError("PyState_RemoveModule: Module index invalid.");
return -1;
}
if (state->modules_by_index == NULL) {
Py_FatalError("PyState_RemoveModule: Interpreters module-list not acessible.");
return -1;
}
if (index > PyList_GET_SIZE(state->modules_by_index)) {
Py_FatalError("PyState_RemoveModule: Module index out of bounds.");
return -1;
}
Py_INCREF(Py_None);
return PyList_SetItem(state->modules_by_index, index, Py_None);
}
/* used by import.c:PyImport_Cleanup */
void
_PyState_ClearModules(void)
{
PyInterpreterState *state = _PyInterpreterState_GET_UNSAFE();
if (state->modules_by_index) {
Py_ssize_t i;
for (i = 0; i < PyList_GET_SIZE(state->modules_by_index); i++) {
PyObject *m = PyList_GET_ITEM(state->modules_by_index, i);
if (PyModule_Check(m)) {
/* cleanup the saved copy of module dicts */
PyModuleDef *md = PyModule_GetDef(m);
if (md)
Py_CLEAR(md->m_base.m_copy);
}
}
/* Setting modules_by_index to NULL could be dangerous, so we
clear the list instead. */
if (PyList_SetSlice(state->modules_by_index,
0, PyList_GET_SIZE(state->modules_by_index),
NULL))
PyErr_WriteUnraisable(state->modules_by_index);
}
}
void
PyThreadState_Clear(PyThreadState *tstate)
{
int verbose = tstate->interp->core_config.verbose;
if (verbose && tstate->frame != NULL)
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a frame\n");
Py_CLEAR(tstate->frame);
Py_CLEAR(tstate->dict);
Py_CLEAR(tstate->async_exc);
Py_CLEAR(tstate->curexc_type);
Py_CLEAR(tstate->curexc_value);
Py_CLEAR(tstate->curexc_traceback);
Py_CLEAR(tstate->exc_state.exc_type);
Py_CLEAR(tstate->exc_state.exc_value);
Py_CLEAR(tstate->exc_state.exc_traceback);
/* The stack of exception states should contain just this thread. */
if (verbose && tstate->exc_info != &tstate->exc_state) {
fprintf(stderr,
"PyThreadState_Clear: warning: thread still has a generator\n");
}
tstate->c_profilefunc = NULL;
tstate->c_tracefunc = NULL;
Py_CLEAR(tstate->c_profileobj);
Py_CLEAR(tstate->c_traceobj);
Py_CLEAR(tstate->coroutine_wrapper);
Py_CLEAR(tstate->async_gen_firstiter);
Py_CLEAR(tstate->async_gen_finalizer);
Py_CLEAR(tstate->context);
}
/* Common code for PyThreadState_Delete() and PyThreadState_DeleteCurrent() */
static void
tstate_delete_common(PyThreadState *tstate)
{
PyInterpreterState *interp;
if (tstate == NULL)
Py_FatalError("PyThreadState_Delete: NULL tstate");
interp = tstate->interp;
if (interp == NULL)
Py_FatalError("PyThreadState_Delete: NULL interp");
HEAD_LOCK();
if (tstate->prev)
tstate->prev->next = tstate->next;
else
interp->tstate_head = tstate->next;
if (tstate->next)
tstate->next->prev = tstate->prev;
HEAD_UNLOCK();
if (tstate->on_delete != NULL) {
tstate->on_delete(tstate->on_delete_data);
}
PyMem_RawFree(tstate);
}
void
PyThreadState_Delete(PyThreadState *tstate)
{
if (tstate == _PyThreadState_GET())
Py_FatalError("PyThreadState_Delete: tstate is still current");
if (_PyRuntime.gilstate.autoInterpreterState &&
PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey) == tstate)
{
PyThread_tss_set(&_PyRuntime.gilstate.autoTSSkey, NULL);
}
tstate_delete_common(tstate);
}
void
PyThreadState_DeleteCurrent()
{
PyThreadState *tstate = _PyThreadState_GET();
if (tstate == NULL)
Py_FatalError(
"PyThreadState_DeleteCurrent: no current tstate");
tstate_delete_common(tstate);
if (_PyRuntime.gilstate.autoInterpreterState &&
PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey) == tstate)
{
PyThread_tss_set(&_PyRuntime.gilstate.autoTSSkey, NULL);
}
_PyThreadState_SET(NULL);
PyEval_ReleaseLock();
}
/*
* Delete all thread states except the one passed as argument.
* Note that, if there is a current thread state, it *must* be the one
* passed as argument. Also, this won't touch any other interpreters
* than the current one, since we don't know which thread state should
* be kept in those other interpreteres.
*/
void
_PyThreadState_DeleteExcept(PyThreadState *tstate)
{
PyInterpreterState *interp = tstate->interp;
PyThreadState *p, *next, *garbage;
HEAD_LOCK();
/* Remove all thread states, except tstate, from the linked list of
thread states. This will allow calling PyThreadState_Clear()
without holding the lock. */
garbage = interp->tstate_head;
if (garbage == tstate)
garbage = tstate->next;
if (tstate->prev)
tstate->prev->next = tstate->next;
if (tstate->next)
tstate->next->prev = tstate->prev;
tstate->prev = tstate->next = NULL;
interp->tstate_head = tstate;
HEAD_UNLOCK();
/* Clear and deallocate all stale thread states. Even if this
executes Python code, we should be safe since it executes
in the current thread, not one of the stale threads. */
for (p = garbage; p; p = next) {
next = p->next;
PyThreadState_Clear(p);
PyMem_RawFree(p);
}
}
PyThreadState *
_PyThreadState_UncheckedGet(void)
{
return _PyThreadState_GET();
}
PyThreadState *
PyThreadState_Get(void)
{
PyThreadState *tstate = _PyThreadState_GET();
if (tstate == NULL)
Py_FatalError("PyThreadState_Get: no current thread");
return tstate;
}
PyThreadState *
PyThreadState_Swap(PyThreadState *newts)
{
PyThreadState *oldts = _PyThreadState_GET();
_PyThreadState_SET(newts);
/* It should not be possible for more than one thread state
to be used for a thread. Check this the best we can in debug
builds.
*/
#if defined(Py_DEBUG)
if (newts) {
/* This can be called from PyEval_RestoreThread(). Similar
to it, we need to ensure errno doesn't change.
*/
int err = errno;
PyThreadState *check = PyGILState_GetThisThreadState();
if (check && check->interp == newts->interp && check != newts)
Py_FatalError("Invalid thread state for this thread");
errno = err;
}
#endif
return oldts;
}
/* An extension mechanism to store arbitrary additional per-thread state.
PyThreadState_GetDict() returns a dictionary that can be used to hold such
state; the caller should pick a unique key and store its state there. If
PyThreadState_GetDict() returns NULL, an exception has *not* been raised
and the caller should assume no per-thread state is available. */
PyObject *
PyThreadState_GetDict(void)
{
PyThreadState *tstate = _PyThreadState_GET();
if (tstate == NULL)
return NULL;
if (tstate->dict == NULL) {
PyObject *d;
tstate->dict = d = PyDict_New();
if (d == NULL)
PyErr_Clear();
}
return tstate->dict;
}
/* Asynchronously raise an exception in a thread.
Requested by Just van Rossum and Alex Martelli.
To prevent naive misuse, you must write your own extension
to call this, or use ctypes. Must be called with the GIL held.
Returns the number of tstates modified (normally 1, but 0 if `id` didn't
match any known thread id). Can be called with exc=NULL to clear an
existing async exception. This raises no exceptions. */
int
PyThreadState_SetAsyncExc(unsigned long id, PyObject *exc)
{
PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
PyThreadState *p;
/* Although the GIL is held, a few C API functions can be called
* without the GIL held, and in particular some that create and
* destroy thread and interpreter states. Those can mutate the
* list of thread states we're traversing, so to prevent that we lock
* head_mutex for the duration.
*/
HEAD_LOCK();
for (p = interp->tstate_head; p != NULL; p = p->next) {
if (p->thread_id == id) {
/* Tricky: we need to decref the current value
* (if any) in p->async_exc, but that can in turn
* allow arbitrary Python code to run, including
* perhaps calls to this function. To prevent
* deadlock, we need to release head_mutex before
* the decref.
*/
PyObject *old_exc = p->async_exc;
Py_XINCREF(exc);
p->async_exc = exc;
HEAD_UNLOCK();
Py_XDECREF(old_exc);
_PyEval_SignalAsyncExc();
return 1;
}
}
HEAD_UNLOCK();
return 0;
}
/* Routines for advanced debuggers, requested by David Beazley.
Don't use unless you know what you are doing! */
PyInterpreterState *
PyInterpreterState_Head(void)
{
return _PyRuntime.interpreters.head;
}
PyInterpreterState *
PyInterpreterState_Main(void)
{
return _PyRuntime.interpreters.main;
}
PyInterpreterState *
PyInterpreterState_Next(PyInterpreterState *interp) {
return interp->next;
}
PyThreadState *
PyInterpreterState_ThreadHead(PyInterpreterState *interp) {
return interp->tstate_head;
}
PyThreadState *
PyThreadState_Next(PyThreadState *tstate) {
return tstate->next;
}
/* The implementation of sys._current_frames(). This is intended to be
called with the GIL held, as it will be when called via
sys._current_frames(). It's possible it would work fine even without
the GIL held, but haven't thought enough about that.
*/
PyObject *
_PyThread_CurrentFrames(void)
{
PyObject *result;
PyInterpreterState *i;
result = PyDict_New();
if (result == NULL)
return NULL;
/* for i in all interpreters:
* for t in all of i's thread states:
* if t's frame isn't NULL, map t's id to its frame
* Because these lists can mutate even when the GIL is held, we
* need to grab head_mutex for the duration.
*/
HEAD_LOCK();
for (i = _PyRuntime.interpreters.head; i != NULL; i = i->next) {
PyThreadState *t;
for (t = i->tstate_head; t != NULL; t = t->next) {
PyObject *id;
int stat;
struct _frame *frame = t->frame;
if (frame == NULL)
continue;
id = PyLong_FromUnsignedLong(t->thread_id);
if (id == NULL)
goto Fail;
stat = PyDict_SetItem(result, id, (PyObject *)frame);
Py_DECREF(id);
if (stat < 0)
goto Fail;
}
}
HEAD_UNLOCK();
return result;
Fail:
HEAD_UNLOCK();
Py_DECREF(result);
return NULL;
}
/* Python "auto thread state" API. */
/* Keep this as a static, as it is not reliable! It can only
ever be compared to the state for the *current* thread.
* If not equal, then it doesn't matter that the actual
value may change immediately after comparison, as it can't
possibly change to the current thread's state.
* If equal, then the current thread holds the lock, so the value can't
change until we yield the lock.
*/
static int
PyThreadState_IsCurrent(PyThreadState *tstate)
{
/* Must be the tstate for this thread */
assert(PyGILState_GetThisThreadState()==tstate);
return tstate == _PyThreadState_GET();
}
/* Internal initialization/finalization functions called by
Py_Initialize/Py_FinalizeEx
*/
void
_PyGILState_Init(PyInterpreterState *i, PyThreadState *t)
{
assert(i && t); /* must init with valid states */
if (PyThread_tss_create(&_PyRuntime.gilstate.autoTSSkey) != 0) {
Py_FatalError("Could not allocate TSS entry");
}
_PyRuntime.gilstate.autoInterpreterState = i;
assert(PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey) == NULL);
assert(t->gilstate_counter == 0);
_PyGILState_NoteThreadState(t);
}
PyInterpreterState *
_PyGILState_GetInterpreterStateUnsafe(void)
{
return _PyRuntime.gilstate.autoInterpreterState;
}
void
_PyGILState_Fini(void)
{
PyThread_tss_delete(&_PyRuntime.gilstate.autoTSSkey);
_PyRuntime.gilstate.autoInterpreterState = NULL;
}
/* Reset the TSS key - called by PyOS_AfterFork_Child().
* This should not be necessary, but some - buggy - pthread implementations
* don't reset TSS upon fork(), see issue #10517.
*/
void
_PyGILState_Reinit(void)
{
/* Force default allocator, since _PyRuntimeState_Fini() must
use the same allocator than this function. */
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyRuntime.interpreters.mutex = PyThread_allocate_lock();
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (_PyRuntime.interpreters.mutex == NULL) {
Py_FatalError("Can't initialize threads for interpreter");
}
PyThreadState *tstate = PyGILState_GetThisThreadState();
PyThread_tss_delete(&_PyRuntime.gilstate.autoTSSkey);
if (PyThread_tss_create(&_PyRuntime.gilstate.autoTSSkey) != 0) {
Py_FatalError("Could not allocate TSS entry");
}
/* If the thread had an associated auto thread state, reassociate it with
* the new key. */
if (tstate &&
PyThread_tss_set(&_PyRuntime.gilstate.autoTSSkey, (void *)tstate) != 0)
{
Py_FatalError("Couldn't create autoTSSkey mapping");
}
}
/* When a thread state is created for a thread by some mechanism other than
PyGILState_Ensure, it's important that the GILState machinery knows about
it so it doesn't try to create another thread state for the thread (this is
a better fix for SF bug #1010677 than the first one attempted).
*/
static void
_PyGILState_NoteThreadState(PyThreadState* tstate)
{
/* If autoTSSkey isn't initialized, this must be the very first
threadstate created in Py_Initialize(). Don't do anything for now
(we'll be back here when _PyGILState_Init is called). */
if (!_PyRuntime.gilstate.autoInterpreterState)
return;
/* Stick the thread state for this thread in thread specific storage.
The only situation where you can legitimately have more than one
thread state for an OS level thread is when there are multiple
interpreters.
You shouldn't really be using the PyGILState_ APIs anyway (see issues
#10915 and #15751).
The first thread state created for that given OS level thread will
"win", which seems reasonable behaviour.
*/
if (PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey) == NULL) {
if ((PyThread_tss_set(&_PyRuntime.gilstate.autoTSSkey, (void *)tstate)
) != 0)
{
Py_FatalError("Couldn't create autoTSSkey mapping");
}
}
/* PyGILState_Release must not try to delete this thread state. */
tstate->gilstate_counter = 1;
}
/* The public functions */
PyThreadState *
PyGILState_GetThisThreadState(void)
{
if (_PyRuntime.gilstate.autoInterpreterState == NULL)
return NULL;
return (PyThreadState *)PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey);
}
int
PyGILState_Check(void)
{
PyThreadState *tstate;
if (!_PyGILState_check_enabled)
return 1;
if (!PyThread_tss_is_created(&_PyRuntime.gilstate.autoTSSkey)) {
return 1;
}
tstate = _PyThreadState_GET();
if (tstate == NULL)
return 0;
return (tstate == PyGILState_GetThisThreadState());
}
PyGILState_STATE
PyGILState_Ensure(void)
{
int current;
PyThreadState *tcur;
int need_init_threads = 0;
/* Note that we do not auto-init Python here - apart from
potential races with 2 threads auto-initializing, pep-311
spells out other issues. Embedders are expected to have
called Py_Initialize() and usually PyEval_InitThreads().
*/
/* Py_Initialize() hasn't been called! */
assert(_PyRuntime.gilstate.autoInterpreterState);
tcur = (PyThreadState *)PyThread_tss_get(&_PyRuntime.gilstate.autoTSSkey);
if (tcur == NULL) {
need_init_threads = 1;
/* Create a new thread state for this thread */
tcur = PyThreadState_New(_PyRuntime.gilstate.autoInterpreterState);
if (tcur == NULL)
Py_FatalError("Couldn't create thread-state for new thread");
/* This is our thread state! We'll need to delete it in the
matching call to PyGILState_Release(). */
tcur->gilstate_counter = 0;
current = 0; /* new thread state is never current */
}
else {
current = PyThreadState_IsCurrent(tcur);
}
if (current == 0) {
PyEval_RestoreThread(tcur);
}
/* Update our counter in the thread-state - no need for locks:
- tcur will remain valid as we hold the GIL.
- the counter is safe as we are the only thread "allowed"
to modify this value
*/
++tcur->gilstate_counter;
if (need_init_threads) {
/* At startup, Python has no concrete GIL. If PyGILState_Ensure() is
called from a new thread for the first time, we need the create the
GIL. */
PyEval_InitThreads();
}
return current ? PyGILState_LOCKED : PyGILState_UNLOCKED;
}
void
PyGILState_Release(PyGILState_STATE oldstate)
{
PyThreadState *tcur = (PyThreadState *)PyThread_tss_get(
&_PyRuntime.gilstate.autoTSSkey);
if (tcur == NULL)
Py_FatalError("auto-releasing thread-state, "
"but no thread-state for this thread");
/* We must hold the GIL and have our thread state current */
/* XXX - remove the check - the assert should be fine,
but while this is very new (April 2003), the extra check
by release-only users can't hurt.
*/
if (! PyThreadState_IsCurrent(tcur))
Py_FatalError("This thread state must be current when releasing");
assert(PyThreadState_IsCurrent(tcur));
--tcur->gilstate_counter;
assert(tcur->gilstate_counter >= 0); /* illegal counter value */
/* If we're going to destroy this thread-state, we must
* clear it while the GIL is held, as destructors may run.
*/
if (tcur->gilstate_counter == 0) {
/* can't have been locked when we created it */
assert(oldstate == PyGILState_UNLOCKED);
PyThreadState_Clear(tcur);
/* Delete the thread-state. Note this releases the GIL too!
* It's vital that the GIL be held here, to avoid shutdown
* races; see bugs 225673 and 1061968 (that nasty bug has a
* habit of coming back).
*/
PyThreadState_DeleteCurrent();
}
/* Release the lock if necessary */
else if (oldstate == PyGILState_UNLOCKED)
PyEval_SaveThread();
}
/**************************/
/* cross-interpreter data */
/**************************/
/* cross-interpreter data */
crossinterpdatafunc _PyCrossInterpreterData_Lookup(PyObject *);
/* This is a separate func from _PyCrossInterpreterData_Lookup in order
to keep the registry code separate. */
static crossinterpdatafunc
_lookup_getdata(PyObject *obj)
{
crossinterpdatafunc getdata = _PyCrossInterpreterData_Lookup(obj);
if (getdata == NULL && PyErr_Occurred() == 0)
PyErr_Format(PyExc_ValueError,
"%S does not support cross-interpreter data", obj);
return getdata;
}
int
_PyObject_CheckCrossInterpreterData(PyObject *obj)
{
crossinterpdatafunc getdata = _lookup_getdata(obj);
if (getdata == NULL) {
return -1;
}
return 0;
}
static int
_check_xidata(_PyCrossInterpreterData *data)
{
// data->data can be anything, including NULL, so we don't check it.
// data->obj may be NULL, so we don't check it.
if (data->interp < 0) {
PyErr_SetString(PyExc_SystemError, "missing interp");
return -1;
}
if (data->new_object == NULL) {
PyErr_SetString(PyExc_SystemError, "missing new_object func");
return -1;
}
// data->free may be NULL, so we don't check it.
return 0;
}
int
_PyObject_GetCrossInterpreterData(PyObject *obj, _PyCrossInterpreterData *data)
{
// _PyInterpreterState_Get() aborts if lookup fails, so we don't need
// to check the result for NULL.
PyInterpreterState *interp = _PyInterpreterState_Get();
// Reset data before re-populating.
*data = (_PyCrossInterpreterData){0};
data->free = PyMem_RawFree; // Set a default that may be overridden.
// Call the "getdata" func for the object.
Py_INCREF(obj);
crossinterpdatafunc getdata = _lookup_getdata(obj);
if (getdata == NULL) {
Py_DECREF(obj);
return -1;
}
int res = getdata(obj, data);
Py_DECREF(obj);
if (res != 0) {
return -1;
}
// Fill in the blanks and validate the result.
data->interp = interp->id;
if (_check_xidata(data) != 0) {
_PyCrossInterpreterData_Release(data);
return -1;
}
return 0;
}
static void
_release_xidata(void *arg)
{
_PyCrossInterpreterData *data = (_PyCrossInterpreterData *)arg;
if (data->free != NULL) {
data->free(data->data);
}
Py_XDECREF(data->obj);
}
static void
_call_in_interpreter(PyInterpreterState *interp,
void (*func)(void *), void *arg)
{
/* We would use Py_AddPendingCall() if it weren't specific to the
* main interpreter (see bpo-33608). In the meantime we take a
* naive approach.
*/
PyThreadState *save_tstate = NULL;
if (interp != _PyInterpreterState_Get()) {
// XXX Using the "head" thread isn't strictly correct.
PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
// XXX Possible GILState issues?
save_tstate = PyThreadState_Swap(tstate);
}
func(arg);
// Switch back.
if (save_tstate != NULL) {
PyThreadState_Swap(save_tstate);
}
}
void
_PyCrossInterpreterData_Release(_PyCrossInterpreterData *data)
{
if (data->data == NULL && data->obj == NULL) {
// Nothing to release!
return;
}
// Switch to the original interpreter.
PyInterpreterState *interp = _PyInterpreterState_LookUpID(data->interp);
if (interp == NULL) {
// The intepreter was already destroyed.
if (data->free != NULL) {
// XXX Someone leaked some memory...
}
return;
}
// "Release" the data and/or the object.
_call_in_interpreter(interp, _release_xidata, data);
}
PyObject *
_PyCrossInterpreterData_NewObject(_PyCrossInterpreterData *data)
{
return data->new_object(data);
}
/* registry of {type -> crossinterpdatafunc} */
/* For now we use a global registry of shareable classes. An
alternative would be to add a tp_* slot for a class's
crossinterpdatafunc. It would be simpler and more efficient. */
static int
_register_xidata(PyTypeObject *cls, crossinterpdatafunc getdata)
{
// Note that we effectively replace already registered classes
// rather than failing.
struct _xidregitem *newhead = PyMem_RawMalloc(sizeof(struct _xidregitem));
if (newhead == NULL)
return -1;
newhead->cls = cls;
newhead->getdata = getdata;
newhead->next = _PyRuntime.xidregistry.head;
_PyRuntime.xidregistry.head = newhead;
return 0;
}
static void _register_builtins_for_crossinterpreter_data(void);
int
_PyCrossInterpreterData_Register_Class(PyTypeObject *cls,
crossinterpdatafunc getdata)
{
if (!PyType_Check(cls)) {
PyErr_Format(PyExc_ValueError, "only classes may be registered");
return -1;
}
if (getdata == NULL) {
PyErr_Format(PyExc_ValueError, "missing 'getdata' func");
return -1;
}
// Make sure the class isn't ever deallocated.
Py_INCREF((PyObject *)cls);
PyThread_acquire_lock(_PyRuntime.xidregistry.mutex, WAIT_LOCK);
if (_PyRuntime.xidregistry.head == NULL) {
_register_builtins_for_crossinterpreter_data();
}
int res = _register_xidata(cls, getdata);
PyThread_release_lock(_PyRuntime.xidregistry.mutex);
return res;
}
/* Cross-interpreter objects are looked up by exact match on the class.
We can reassess this policy when we move from a global registry to a
tp_* slot. */
crossinterpdatafunc
_PyCrossInterpreterData_Lookup(PyObject *obj)
{
PyObject *cls = PyObject_Type(obj);
crossinterpdatafunc getdata = NULL;
PyThread_acquire_lock(_PyRuntime.xidregistry.mutex, WAIT_LOCK);
struct _xidregitem *cur = _PyRuntime.xidregistry.head;
if (cur == NULL) {
_register_builtins_for_crossinterpreter_data();
cur = _PyRuntime.xidregistry.head;
}
for(; cur != NULL; cur = cur->next) {
if (cur->cls == (PyTypeObject *)cls) {
getdata = cur->getdata;
break;
}
}
Py_DECREF(cls);
PyThread_release_lock(_PyRuntime.xidregistry.mutex);
return getdata;
}
/* cross-interpreter data for builtin types */
struct _shared_bytes_data {
char *bytes;
Py_ssize_t len;
};
static PyObject *
_new_bytes_object(_PyCrossInterpreterData *data)
{
struct _shared_bytes_data *shared = (struct _shared_bytes_data *)(data->data);
return PyBytes_FromStringAndSize(shared->bytes, shared->len);
}
static int
_bytes_shared(PyObject *obj, _PyCrossInterpreterData *data)
{
struct _shared_bytes_data *shared = PyMem_NEW(struct _shared_bytes_data, 1);
if (PyBytes_AsStringAndSize(obj, &shared->bytes, &shared->len) < 0) {
return -1;
}
data->data = (void *)shared;
Py_INCREF(obj);
data->obj = obj; // Will be "released" (decref'ed) when data released.
data->new_object = _new_bytes_object;
data->free = PyMem_Free;
return 0;
}
struct _shared_str_data {
int kind;
const void *buffer;
Py_ssize_t len;
};
static PyObject *
_new_str_object(_PyCrossInterpreterData *data)
{
struct _shared_str_data *shared = (struct _shared_str_data *)(data->data);
return PyUnicode_FromKindAndData(shared->kind, shared->buffer, shared->len);
}
static int
_str_shared(PyObject *obj, _PyCrossInterpreterData *data)
{
struct _shared_str_data *shared = PyMem_NEW(struct _shared_str_data, 1);
shared->kind = PyUnicode_KIND(obj);
shared->buffer = PyUnicode_DATA(obj);
shared->len = PyUnicode_GET_LENGTH(obj) - 1;
data->data = (void *)shared;
Py_INCREF(obj);
data->obj = obj; // Will be "released" (decref'ed) when data released.
data->new_object = _new_str_object;
data->free = PyMem_Free;
return 0;
}
static PyObject *
_new_long_object(_PyCrossInterpreterData *data)
{
return PyLong_FromSsize_t((Py_ssize_t)(data->data));
}
static int
_long_shared(PyObject *obj, _PyCrossInterpreterData *data)
{
/* Note that this means the size of shareable ints is bounded by
* sys.maxsize. Hence on 32-bit architectures that is half the
* size of maximum shareable ints on 64-bit.
*/
Py_ssize_t value = PyLong_AsSsize_t(obj);
if (value == -1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
PyErr_SetString(PyExc_OverflowError, "try sending as bytes");
}
return -1;
}
data->data = (void *)value;
data->obj = NULL;
data->new_object = _new_long_object;
data->free = NULL;
return 0;
}
static PyObject *
_new_none_object(_PyCrossInterpreterData *data)
{
// XXX Singleton refcounts are problematic across interpreters...
Py_INCREF(Py_None);
return Py_None;
}
static int
_none_shared(PyObject *obj, _PyCrossInterpreterData *data)
{
data->data = NULL;
// data->obj remains NULL
data->new_object = _new_none_object;
data->free = NULL; // There is nothing to free.
return 0;
}
static void
_register_builtins_for_crossinterpreter_data(void)
{
// None
if (_register_xidata((PyTypeObject *)PyObject_Type(Py_None), _none_shared) != 0) {
Py_FatalError("could not register None for cross-interpreter sharing");
}
// int
if (_register_xidata(&PyLong_Type, _long_shared) != 0) {
Py_FatalError("could not register int for cross-interpreter sharing");
}
// bytes
if (_register_xidata(&PyBytes_Type, _bytes_shared) != 0) {
Py_FatalError("could not register bytes for cross-interpreter sharing");
}
// str
if (_register_xidata(&PyUnicode_Type, _str_shared) != 0) {
Py_FatalError("could not register str for cross-interpreter sharing");
}
}
#ifdef __cplusplus
}
#endif
|