summaryrefslogtreecommitdiffstats
path: root/generic/tkEvent.c
blob: 36f1c3a293ccdc5e6b5e200c846628a674eb8416 (plain)
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
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
/*
 * tkEvent.c --
 *
 *	This file provides basic low-level facilities for managing X events in
 *	Tk.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1995 Sun Microsystems, Inc.
 * Copyright (c) 1998-2000 Ajuba Solutions.
 * Copyright (c) 2004 George Peter Staplin
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkEvent.c,v 1.40 2010/01/01 22:50:27 dkf Exp $
 */

#include "tkInt.h"

/*
 * There's a potential problem if a handler is deleted while it's current
 * (i.e. its function is executing), since Tk_HandleEvent will need to read
 * the handler's "nextPtr" field when the function returns. To handle this
 * problem, structures of the type below indicate the next handler to be
 * processed for any (recursively nested) dispatches in progress. The
 * nextHandler fields get updated if the handlers pointed to are deleted.
 * Tk_HandleEvent also needs to know if the entire window gets deleted; the
 * winPtr field is set to zero if that particular window gets deleted.
 */

typedef struct InProgress {
    XEvent *eventPtr;		/* Event currently being handled. */
    TkWindow *winPtr;		/* Window for event. Gets set to None if
				 * window is deleted while event is being
				 * handled. */
    TkEventHandler *nextHandler;/* Next handler in search. */
    struct InProgress *nextPtr;	/* Next higher nested search. */
} InProgress;

/*
 * For each call to Tk_CreateGenericHandler or Tk_CreateClientMessageHandler,
 * an instance of the following structure will be created. All of the active
 * handlers are linked into a list.
 */

typedef struct GenericHandler {
    Tk_GenericProc *proc;	/* Function to dispatch on all X events. */
    ClientData clientData;	/* Client data to pass to function. */
    int deleteFlag;		/* Flag to set when this handler is
				 * deleted. */
    struct GenericHandler *nextPtr;
				/* Next handler in list of all generic
				 * handlers, or NULL for end of list. */
} GenericHandler;

/*
 * There's a potential problem if Tk_HandleEvent is entered recursively. A
 * handler cannot be deleted physically until we have returned from calling
 * it. Otherwise, we're looking at unallocated memory in advancing to its
 * `next' entry. We deal with the problem by using the `delete flag' and
 * deleting handlers only when it's known that there's no handler active.
 */

/*
 * The following structure is used for queueing X-style events on the Tcl
 * event queue.
 */

typedef struct TkWindowEvent {
    Tcl_Event header;		/* Standard information for all events. */
    XEvent event;		/* The X event. */
} TkWindowEvent;

/*
 * Array of event masks corresponding to each X event:
 */

static unsigned long realEventMasks[MappingNotify+1] = {
    0,
    0,
    KeyPressMask,			/* KeyPress */
    KeyReleaseMask,			/* KeyRelease */
    ButtonPressMask,			/* ButtonPress */
    ButtonReleaseMask,			/* ButtonRelease */
    PointerMotionMask|PointerMotionHintMask|ButtonMotionMask
	    |Button1MotionMask|Button2MotionMask|Button3MotionMask
	    |Button4MotionMask|Button5MotionMask,
					/* MotionNotify */
    EnterWindowMask,			/* EnterNotify */
    LeaveWindowMask,			/* LeaveNotify */
    FocusChangeMask,			/* FocusIn */
    FocusChangeMask,			/* FocusOut */
    KeymapStateMask,			/* KeymapNotify */
    ExposureMask,			/* Expose */
    ExposureMask,			/* GraphicsExpose */
    ExposureMask,			/* NoExpose */
    VisibilityChangeMask,		/* VisibilityNotify */
    SubstructureNotifyMask,		/* CreateNotify */
    StructureNotifyMask,		/* DestroyNotify */
    StructureNotifyMask,		/* UnmapNotify */
    StructureNotifyMask,		/* MapNotify */
    SubstructureRedirectMask,		/* MapRequest */
    StructureNotifyMask,		/* ReparentNotify */
    StructureNotifyMask,		/* ConfigureNotify */
    SubstructureRedirectMask,		/* ConfigureRequest */
    StructureNotifyMask,		/* GravityNotify */
    ResizeRedirectMask,			/* ResizeRequest */
    StructureNotifyMask,		/* CirculateNotify */
    SubstructureRedirectMask,		/* CirculateRequest */
    PropertyChangeMask,			/* PropertyNotify */
    0,					/* SelectionClear */
    0,					/* SelectionRequest */
    0,					/* SelectionNotify */
    ColormapChangeMask,			/* ColormapNotify */
    0,					/* ClientMessage */
    0					/* Mapping Notify */
};

static unsigned long virtualEventMasks[TK_LASTEVENT-VirtualEvent] = {
    VirtualEventMask,			/* VirtualEvents */
    ActivateMask,			/* ActivateNotify */
    ActivateMask,			/* DeactivateNotify */
    MouseWheelMask			/* MouseWheelEvent */
};

/*
 * For each exit handler created with a call to TkCreateExitHandler or
 * TkCreateThreadExitHandler there is a structure of the following type:
 */

typedef struct ExitHandler {
    Tcl_ExitProc *proc;		/* Function to call when process exits. */
    ClientData clientData;	/* One word of information to pass to proc. */
    struct ExitHandler *nextPtr;/* Next in list of all exit handlers for this
				 * application, or NULL for end of list. */
} ExitHandler;

/*
 * The structure below is used to store Data for the Event module that must be
 * kept thread-local. The "dataKey" is used to fetch the thread-specific
 * storage for the current thread.
 */

typedef struct ThreadSpecificData {
    int handlersActive;		/* The following variable has a non-zero value
				 * when a handler is active. */
    InProgress *pendingPtr;	/* Topmost search in progress, or NULL if
				 * none. */

    /*
     * List of generic handler records.
     */

    GenericHandler *genericList;/* First handler in the list, or NULL. */
    GenericHandler *lastGenericPtr;
				/* Last handler in list. */

    /*
     * List of client message handler records.
     */

    GenericHandler *cmList;	/* First handler in the list, or NULL. */
    GenericHandler *lastCmPtr;	/* Last handler in list. */

    /*
     * If someone has called Tk_RestrictEvents, the information below keeps
     * track of it.
     */

    Tk_RestrictProc *restrictProc;
				/* Function to call. NULL means no
				 * restrictProc is currently in effect. */
    ClientData restrictArg;	/* Argument to pass to restrictProc. */
    ExitHandler *firstExitPtr;	/* First in list of all exit handlers for this
				 * thread. */
    int inExit;			/* True when this thread is exiting. This is
				 * used as a hack to decide to close the
				 * standard channels. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * There are both per-process and per-thread exit handlers. The first list is
 * controlled by a mutex. The other is in thread local storage.
 */

static ExitHandler *firstExitPtr = NULL;
				/* First in list of all exit handlers for
				 * application. */
TCL_DECLARE_MUTEX(exitMutex)

/*
 * Prototypes for functions that are only referenced locally within this file.
 */

static void		DelayedMotionProc(ClientData clientData);
static int		GetButtonMask(unsigned int Button);
static unsigned long    GetEventMaskFromXEvent(XEvent *eventPtr);
static TkWindow *	GetTkWindowFromXEvent(XEvent *eventPtr);
static void		InvokeClientMessageHandlers(ThreadSpecificData *tsdPtr,
			    Tk_Window tkwin, XEvent *eventPtr);
static int		InvokeFocusHandlers(TkWindow **winPtrPtr,
			    unsigned long mask, XEvent *eventPtr);
static int		InvokeGenericHandlers(ThreadSpecificData *tsdPtr,
			    XEvent *eventPtr);
static int		InvokeMouseHandlers(TkWindow *winPtr,
			    unsigned long mask, XEvent *eventPtr);
static Window		ParentXId(Display *display, Window w);
static int		RefreshKeyboardMappingIfNeeded(XEvent *eventPtr);
static int		TkXErrorHandler(ClientData clientData,
			    XErrorEvent *errEventPtr);
static void		UpdateButtonEventState(XEvent *eventPtr);
static int		WindowEventProc(Tcl_Event *evPtr, int flags);
#ifdef TK_USE_INPUT_METHODS
static void		CreateXIC(TkWindow *winPtr);
#endif /* TK_USE_INPUT_METHODS */

/*
 *----------------------------------------------------------------------
 *
 * InvokeFocusHandlers --
 *
 *	Call focus-related code to look at FocusIn, FocusOut, Enter, and Leave
 *	events; depending on its return value, ignore the event.
 *
 * Results:
 *	0 further processing can be done on the event.
 *	1 we are done with the event passed.
 *
 * Side effects:
 *	The *winPtrPtr in the caller may be changed to the TkWindow for the
 *	window with focus.
 *
 *----------------------------------------------------------------------
 */

static int
InvokeFocusHandlers(
    TkWindow **winPtrPtr,
    unsigned long mask,
    XEvent *eventPtr)
{
    if ((mask & (FocusChangeMask|EnterWindowMask|LeaveWindowMask))
	    && (TkFocusFilterEvent(*winPtrPtr, eventPtr) == 0)) {
	return 1;
    }

    /*
     * Only key-related events are directed according to the focus.
     */

    if (mask & (KeyPressMask|KeyReleaseMask)) {
	(*winPtrPtr)->dispPtr->lastEventTime = eventPtr->xkey.time;
	*winPtrPtr = TkFocusKeyEvent(*winPtrPtr, eventPtr);
	if (*winPtrPtr == NULL) {
	    return 1;
	}
    }

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * InvokeMouseHandlers --
 *
 *	Call a grab-related function to do special processing on pointer
 *	events.
 *
 * Results:
 *	0 further processing can be done on the event.
 *	1 we are done with the event passed.
 *
 * Side effects:
 *	New events may be queued from TkPointerEvent and grabs may be added
 *	and/or removed. The eventPtr may be changed by TkPointerEvent in some
 *	cases.
 *
 *----------------------------------------------------------------------
 */

static int
InvokeMouseHandlers(
    TkWindow *winPtr,
    unsigned long mask,
    XEvent *eventPtr)
{
    if (mask & (ButtonPressMask|ButtonReleaseMask|PointerMotionMask
	    |EnterWindowMask|LeaveWindowMask)) {

	if (mask & (ButtonPressMask|ButtonReleaseMask)) {
	    winPtr->dispPtr->lastEventTime = eventPtr->xbutton.time;
	} else if (mask & PointerMotionMask) {
	    winPtr->dispPtr->lastEventTime = eventPtr->xmotion.time;
	} else {
	    winPtr->dispPtr->lastEventTime = eventPtr->xcrossing.time;
	}

	if (TkPointerEvent(eventPtr, winPtr) == 0) {
	    /*
	     * The event should be ignored to make grab work correctly (as the
	     * comment for TkPointerEvent states).
	     */

	    return 1;
	}
    }

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * CreateXIC --
 *
 *	Create the X input context for our winPtr.
 *	XIM is only ever enabled on Unix.
 *
 *----------------------------------------------------------------------
 */

#ifdef TK_USE_INPUT_METHODS
static void
CreateXIC(
    TkWindow *winPtr)
{
    TkDisplay *dispPtr = winPtr->dispPtr;
    long im_event_mask = 0L;
    const char *preedit_attname = NULL;
    XVaNestedList preedit_attlist = NULL;

    if (dispPtr->inputStyle & XIMPreeditPosition) {
	XPoint spot = {0, 0};

	preedit_attname = XNPreeditAttributes;
	preedit_attlist = XVaCreateNestedList(0,
		XNSpotLocation, &spot,
		XNFontSet, dispPtr->inputXfs,
		NULL);
    }

    winPtr->inputContext = XCreateIC(dispPtr->inputMethod,
	    XNInputStyle, dispPtr->inputStyle,
	    XNClientWindow, winPtr->window,
	    XNFocusWindow, winPtr->window,
	    preedit_attname, preedit_attlist,
	    NULL);

    if (preedit_attlist) {
	XFree(preedit_attlist);
    }


    if (winPtr->inputContext == NULL) {
	/* XCreateIC failed. */
	return;
    }
    
    /*
     * Adjust the window's event mask if the IM requires it.
     */
    XGetICValues(winPtr->inputContext, XNFilterEvents, &im_event_mask, NULL);
    if ((winPtr->atts.event_mask & im_event_mask) != im_event_mask) {
	winPtr->atts.event_mask |= im_event_mask;
	XSelectInput(winPtr->display, winPtr->window, winPtr->atts.event_mask);
    }
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * GetTkWindowFromXEvent --
 *
 *	Attempt to find which TkWindow is associated with an event. If it
 *	fails we attempt to get the TkWindow from the parent for a property
 *	notification.
 *
 * Results:
 *	The TkWindow associated with the event or NULL.
 *
 * Side effects:
 *	TkSelPropProc may influence selection on windows not known to Tk.
 *
 *----------------------------------------------------------------------
 */

static TkWindow *
GetTkWindowFromXEvent(
    XEvent *eventPtr)
{
    TkWindow *winPtr;
    Window parentXId, handlerWindow = eventPtr->xany.window;

    if ((eventPtr->xany.type == StructureNotifyMask)
	    && (eventPtr->xmap.event != eventPtr->xmap.window)) {
	handlerWindow = eventPtr->xmap.event;
    }

    winPtr = (TkWindow *) Tk_IdToWindow(eventPtr->xany.display, handlerWindow);

    if (winPtr == NULL) {
	/*
	 * There isn't a TkWindow structure for this window. However, if the
	 * event is a PropertyNotify event then call the selection manager (it
	 * deals beneath-the-table with certain properties). Also, if the
	 * window's parent is a Tk window that has the TK_PROP_PROPCHANGE flag
	 * set, then we must propagate the PropertyNotify event up to the
	 * parent.
	 */

	if (eventPtr->type != PropertyNotify) {
	    return NULL;
	}
	TkSelPropProc(eventPtr);
	parentXId = ParentXId(eventPtr->xany.display, handlerWindow);
	if (parentXId == None) {
	    return NULL;
	}
	winPtr = (TkWindow *) Tk_IdToWindow(eventPtr->xany.display, parentXId);
	if (winPtr == NULL) {
	    return NULL;
	}
	if (!(winPtr->flags & TK_PROP_PROPCHANGE)) {
	    return NULL;
	}
    }
    return winPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * GetEventMaskFromXEvent --
 *
 *	The event type is looked up in our eventMasks tables, and may be
 *	changed to a different mask depending on the state of the event and
 *	window members.
 *
 * Results:
 *	The mask for the event.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static unsigned long
GetEventMaskFromXEvent(
    XEvent *eventPtr)
{
    unsigned long mask;

    /*
     * Get the event mask from the correct table. Note that there are two
     * tables here because that means we no longer need this code to rely on
     * the exact value of VirtualEvent, which has caused us problems in the
     * past when X11 changed the value of LASTEvent. [Bug ???]
     */

    if (eventPtr->xany.type <= MappingNotify) {
	mask = realEventMasks[eventPtr->xany.type];
    } else if (eventPtr->xany.type >= VirtualEvent
	    && eventPtr->xany.type<TK_LASTEVENT) {
	mask = virtualEventMasks[eventPtr->xany.type - VirtualEvent];
    } else {
	mask = 0;
    }

    /*
     * Events selected by StructureNotify require special handling. They look
     * the same as those selected by SubstructureNotify. The only difference
     * is whether the "event" and "window" fields are the same. Compare the
     * two fields and convert StructureNotify to SubstructureNotify if
     * necessary.
     */

    if (mask == StructureNotifyMask) {
	if (eventPtr->xmap.event != eventPtr->xmap.window) {
	    mask = SubstructureNotifyMask;
	}
    }
    return mask;
}

/*
 *----------------------------------------------------------------------
 *
 * RefreshKeyboardMappingIfNeeded --
 *
 *	If the event is a MappingNotify event, find its display and refresh
 *	the keyboard mapping information for the display.
 *
 * Results:
 *	0 if the event was not a MappingNotify event
 *	1 if the event was a MappingNotify event
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
RefreshKeyboardMappingIfNeeded(
    XEvent *eventPtr)
{
    TkDisplay *dispPtr;

    if (eventPtr->type == MappingNotify) {
	dispPtr = TkGetDisplay(eventPtr->xmapping.display);
	if (dispPtr != NULL) {
	    XRefreshKeyboardMapping(&eventPtr->xmapping);
	    dispPtr->bindInfoStale = 1;
	}
	return 1;
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * GetButtonMask --
 *
 *	Return the proper Button${n}Mask for the button.
 *
 * Results:
 *	A button mask.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
GetButtonMask(
    unsigned int button)
{
    switch (button) {
    case 1:
	return Button1Mask;
    case 2:
	return Button2Mask;
    case 3:
	return Button3Mask;
    case 4:
	return Button4Mask;
    case 5:
	return Button5Mask;
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateButtonEventState --
 *
 *	Update the button event state in our TkDisplay using the XEvent
 *	passed. We also may modify the the XEvent passed to fit some aspects
 *	of our TkDisplay.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The TkDisplay's private button state may be modified. The eventPtr's
 *	state may be updated to reflect masks stored in our TkDisplay that the
 *	event doesn't contain. The eventPtr may also be modified to not
 *	contain a button state for the window in which it was not pressed in.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateButtonEventState(
    XEvent *eventPtr)
{
    TkDisplay *dispPtr;
    int allButtonsMask = Button1Mask | Button2Mask | Button3Mask
	    | Button4Mask | Button5Mask;

    switch (eventPtr->type) {
    case ButtonPress:
	dispPtr = TkGetDisplay(eventPtr->xbutton.display);
	dispPtr->mouseButtonWindow = eventPtr->xbutton.window;
	eventPtr->xbutton.state |= dispPtr->mouseButtonState;

	dispPtr->mouseButtonState |= GetButtonMask(eventPtr->xbutton.button);
	break;

    case ButtonRelease:
	dispPtr = TkGetDisplay(eventPtr->xbutton.display);
	dispPtr->mouseButtonWindow = None;
	dispPtr->mouseButtonState &= ~GetButtonMask(eventPtr->xbutton.button);
	eventPtr->xbutton.state |= dispPtr->mouseButtonState;
	break;

    case MotionNotify:
	dispPtr = TkGetDisplay(eventPtr->xmotion.display);
	if (dispPtr->mouseButtonState & allButtonsMask) {
	    if (eventPtr->xbutton.window != dispPtr->mouseButtonWindow) {
		/*
		 * This motion event should not be interpreted as a button
		 * press + motion event since this is not the same window the
		 * button was pressed down in.
		 */

		dispPtr->mouseButtonState &= ~allButtonsMask;
		dispPtr->mouseButtonWindow = None;
	    } else {
		eventPtr->xmotion.state |= dispPtr->mouseButtonState;
	    }
	}
	break;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * InvokeClientMessageHandlers --
 *
 *	Iterate the list of handlers and invoke the function pointer for each.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Handlers may be deleted and events may be sent to handlers.
 *
 *----------------------------------------------------------------------
 */

static void
InvokeClientMessageHandlers(
    ThreadSpecificData *tsdPtr,
    Tk_Window tkwin,
    XEvent *eventPtr)
{
    GenericHandler *prevPtr, *tmpPtr, *curPtr = tsdPtr->cmList;

    for (prevPtr = NULL; curPtr != NULL; ) {
	if (curPtr->deleteFlag) {
	    if (!tsdPtr->handlersActive) {
		/*
		 * This handler needs to be deleted and there are no calls
		 * pending through any handlers, so now is a safe time to
		 * delete it.
		 */

		tmpPtr = curPtr->nextPtr;
		if (prevPtr == NULL) {
		    tsdPtr->cmList = tmpPtr;
		} else {
		    prevPtr->nextPtr = tmpPtr;
		}
		if (tmpPtr == NULL) {
		    tsdPtr->lastCmPtr = prevPtr;
		}
		(void) ckfree((char *) curPtr);
		curPtr = tmpPtr;
		continue;
	    }
	} else {
	    int done;

	    tsdPtr->handlersActive++;
	    done = (*(Tk_ClientMessageProc *)curPtr->proc)(tkwin, eventPtr);
	    tsdPtr->handlersActive--;
	    if (done) {
		break;
	    }
	}
	prevPtr = curPtr;
	curPtr = curPtr->nextPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * InvokeGenericHandlers --
 *
 *	Iterate the list of handlers and invoke the function pointer for each.
 *	If the handler invoked returns a non-zero value then we are done.
 *
 * Results:
 *	0 when the event wasn't handled by a handler. Non-zero when it was
 *	processed and handled by a handler.
 *
 * Side effects:
 *	Handlers may be deleted and events may be sent to handlers.
 *
 *----------------------------------------------------------------------
 */

static int
InvokeGenericHandlers(
    ThreadSpecificData *tsdPtr,
    XEvent *eventPtr)
{
    GenericHandler *prevPtr, *tmpPtr, *curPtr = tsdPtr->genericList;

    for (prevPtr = NULL; curPtr != NULL; ) {
	if (curPtr->deleteFlag) {
	    if (!tsdPtr->handlersActive) {
		/*
		 * This handler needs to be deleted and there are no calls
		 * pending through the handler, so now is a safe time to
		 * delete it.
		 */

		tmpPtr = curPtr->nextPtr;
		if (prevPtr == NULL) {
		    tsdPtr->genericList = tmpPtr;
		} else {
		    prevPtr->nextPtr = tmpPtr;
		}
		if (tmpPtr == NULL) {
		    tsdPtr->lastGenericPtr = prevPtr;
		}
		(void) ckfree((char *) curPtr);
		curPtr = tmpPtr;
		continue;
	    }
	} else {
	    int done;

	    tsdPtr->handlersActive++;
	    done = curPtr->proc(curPtr->clientData, eventPtr);
	    tsdPtr->handlersActive--;
	    if (done) {
		return done;
	    }
	}
	prevPtr = curPtr;
	curPtr = curPtr->nextPtr;
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_CreateEventHandler --
 *
 *	Arrange for a given function to be invoked whenever events from a
 *	given class occur in a given window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	From now on, whenever an event of the type given by mask occurs for
 *	token and is processed by Tk_HandleEvent, proc will be called. See the
 *	manual entry for details of the calling sequence and return value for
 *	proc.
 *
 *----------------------------------------------------------------------
 */

void
Tk_CreateEventHandler(
    Tk_Window token,		/* Token for window in which to create
				 * handler. */
    unsigned long mask,		/* Events for which proc should be called. */
    Tk_EventProc *proc,		/* Function to call for each selected event */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    register TkEventHandler *handlerPtr;
    register TkWindow *winPtr = (TkWindow *) token;

    /*
     * Skim through the list of existing handlers to (a) compute the overall
     * event mask for the window (so we can pass this new value to the X
     * system) and (b) see if there's already a handler declared with the same
     * callback and clientData (if so, just change the mask). If no existing
     * handler matches, then create a new handler.
     */

    if (winPtr->handlerList == NULL) {
	/*
	 * No event handlers defined at all, so must create.
	 */

	handlerPtr = (TkEventHandler *) ckalloc(sizeof(TkEventHandler));
	winPtr->handlerList = handlerPtr;
    } else {
	int found = 0;

	for (handlerPtr = winPtr->handlerList; ;
		handlerPtr = handlerPtr->nextPtr) {
	    if ((handlerPtr->proc == proc)
		    && (handlerPtr->clientData == clientData)) {
		handlerPtr->mask = mask;
		found = 1;
	    }
	    if (handlerPtr->nextPtr == NULL) {
		break;
	    }
	}

	/*
	 * If we found anything, we're done because we do not need to use
	 * XSelectInput; Tk always selects on all events anyway in order to
	 * support binding on classes, 'all' and other bind-tags.
	 */

	if (found) {
	    return;
	}

	/*
	 * No event handler matched, so create a new one.
	 */

	handlerPtr->nextPtr = (TkEventHandler *)
		ckalloc(sizeof(TkEventHandler));
	handlerPtr = handlerPtr->nextPtr;
    }

    /*
     * Initialize the new event handler.
     */

    handlerPtr->mask = mask;
    handlerPtr->proc = proc;
    handlerPtr->clientData = clientData;
    handlerPtr->nextPtr = NULL;

    /*
     * No need to call XSelectInput: Tk always selects on all events for all
     * windows (needed to support bindings on classes and "all").
     */
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_DeleteEventHandler --
 *
 *	Delete a previously-created handler.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If there existed a handler as described by the parameters, the handler
 *	is deleted so that proc will not be invoked again.
 *
 *----------------------------------------------------------------------
 */

void
Tk_DeleteEventHandler(
    Tk_Window token,		/* Same as corresponding arguments passed */
    unsigned long mask,		/* previously to Tk_CreateEventHandler. */
    Tk_EventProc *proc,
    ClientData clientData)
{
    register TkEventHandler *handlerPtr;
    register InProgress *ipPtr;
    TkEventHandler *prevPtr;
    register TkWindow *winPtr = (TkWindow *) token;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    /*
     * Find the event handler to be deleted, or return immediately if it
     * doesn't exist.
     */

    for (handlerPtr = winPtr->handlerList, prevPtr = NULL; ;
	    prevPtr = handlerPtr, handlerPtr = handlerPtr->nextPtr) {
	if (handlerPtr == NULL) {
	    return;
	}
	if ((handlerPtr->mask == mask) && (handlerPtr->proc == proc)
		&& (handlerPtr->clientData == clientData)) {
	    break;
	}
    }

    /*
     * If Tk_HandleEvent is about to process this handler, tell it to process
     * the next one instead.
     */

    for (ipPtr = tsdPtr->pendingPtr; ipPtr != NULL; ipPtr = ipPtr->nextPtr) {
	if (ipPtr->nextHandler == handlerPtr) {
	    ipPtr->nextHandler = handlerPtr->nextPtr;
	}
    }

    /*
     * Free resources associated with the handler.
     */

    if (prevPtr == NULL) {
	winPtr->handlerList = handlerPtr->nextPtr;
    } else {
	prevPtr->nextPtr = handlerPtr->nextPtr;
    }
    ckfree((char *) handlerPtr);

    /*
     * No need to call XSelectInput: Tk always selects on all events for all
     * windows (needed to support bindings on classes and "all").
     */
}

/*----------------------------------------------------------------------
 *
 * Tk_CreateGenericHandler --
 *
 *	Register a function to be called on each X event, regardless of
 *	display or window. Generic handlers are useful for capturing events
 *	that aren't associated with windows, or events for windows not managed
 *	by Tk.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	From now on, whenever an X event is given to Tk_HandleEvent, invoke
 *	proc, giving it clientData and the event as arguments.
 *
 *----------------------------------------------------------------------
 */

void
Tk_CreateGenericHandler(
    Tk_GenericProc *proc,	/* Function to call on every event. */
    ClientData clientData)	/* One-word value to pass to proc. */
{
    GenericHandler *handlerPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    handlerPtr = (GenericHandler *) ckalloc(sizeof(GenericHandler));

    handlerPtr->proc		= proc;
    handlerPtr->clientData	= clientData;
    handlerPtr->deleteFlag	= 0;
    handlerPtr->nextPtr		= NULL;
    if (tsdPtr->genericList == NULL) {
	tsdPtr->genericList	= handlerPtr;
    } else {
	tsdPtr->lastGenericPtr->nextPtr = handlerPtr;
    }
    tsdPtr->lastGenericPtr	= handlerPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_DeleteGenericHandler --
 *
 *	Delete a previously-created generic handler.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	If there existed a handler as described by the parameters, that
 *	handler is logically deleted so that proc will not be invoked again.
 *	The physical deletion happens in the event loop in Tk_HandleEvent.
 *
 *----------------------------------------------------------------------
 */

void
Tk_DeleteGenericHandler(
    Tk_GenericProc *proc,
    ClientData clientData)
{
    GenericHandler * handler;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    for (handler=tsdPtr->genericList ; handler ; handler=handler->nextPtr) {
	if ((handler->proc == proc) && (handler->clientData == clientData)) {
	    handler->deleteFlag = 1;
	}
    }
}

/*----------------------------------------------------------------------
 *
 * Tk_CreateClientMessageHandler --
 *
 *	Register a function to be called on each ClientMessage event.
 *	ClientMessage handlers are useful for Drag&Drop extensions.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	From now on, whenever a ClientMessage event is received that isn't a
 *	WM_PROTOCOL event or SelectionEvent, invoke proc, giving it tkwin and
 *	the event as arguments.
 *
 *----------------------------------------------------------------------
 */

void
Tk_CreateClientMessageHandler(
    Tk_ClientMessageProc *proc)	/* Function to call on event. */
{
    GenericHandler *handlerPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    /*
     * We use a GenericHandler struct, because it's basically the same, except
     * with an extra clientData field we'll never use.
     */

    handlerPtr = (GenericHandler *) ckalloc(sizeof(GenericHandler));

    handlerPtr->proc = (Tk_GenericProc *) proc;
    handlerPtr->clientData = NULL;	/* never used */
    handlerPtr->deleteFlag = 0;
    handlerPtr->nextPtr = NULL;
    if (tsdPtr->cmList == NULL) {
	tsdPtr->cmList = handlerPtr;
    } else {
	tsdPtr->lastCmPtr->nextPtr = handlerPtr;
    }
    tsdPtr->lastCmPtr = handlerPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_DeleteClientMessageHandler --
 *
 *	Delete a previously-created ClientMessage handler.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	If there existed a handler as described by the parameters, that
 *	handler is logically deleted so that proc will not be invoked again.
 *	The physical deletion happens in the event loop in
 *	TkClientMessageEventProc.
 *
 *----------------------------------------------------------------------
 */

void
Tk_DeleteClientMessageHandler(
    Tk_ClientMessageProc *proc)
{
    GenericHandler * handler;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    for (handler=tsdPtr->cmList ; handler!=NULL ; handler=handler->nextPtr) {
	if (handler->proc == (Tk_GenericProc *) proc) {
	    handler->deleteFlag = 1;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkEventInit --
 *
 *	This functions initializes all the event module structures used by the
 *	current thread. It must be called before any other function in this
 *	file is called.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkEventInit(void)
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    tsdPtr->handlersActive	= 0;
    tsdPtr->pendingPtr		= NULL;
    tsdPtr->genericList		= NULL;
    tsdPtr->lastGenericPtr	= NULL;
    tsdPtr->cmList		= NULL;
    tsdPtr->lastCmPtr		= NULL;
    tsdPtr->restrictProc	= NULL;
    tsdPtr->restrictArg		= NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TkXErrorHandler --
 *
 *	TkXErrorHandler is an error handler, to be installed via
 *	Tk_CreateErrorHandler, that will set a flag if an X error occurred.
 *
 * Results:
 *	Always returns 0, indicating that the X error was handled.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
TkXErrorHandler(
    ClientData clientData,	/* Pointer to flag we set. */
    XErrorEvent *errEventPtr)	/* X error info. */
{
    int *error;

    error = (int *) clientData;
    *error = 1;
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * ParentXId --
 *
 *	Returns the parent of the given window, or "None" if the window
 *	doesn't exist.
 *
 * Results:
 *	Returns an X window ID.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static Window
ParentXId(
    Display *display,
    Window w)
{
    Tk_ErrorHandler handler;
    int gotXError;
    Status status;
    Window parent;
    Window root;
    Window *childList;
    unsigned int nChildren;

    /*
     * Handle errors ourselves.
     */

    gotXError = 0;
    handler = Tk_CreateErrorHandler(display, -1, -1, -1,
	    TkXErrorHandler, (ClientData) (&gotXError));

    /*
     * Get the parent window.
     */

    status = XQueryTree(display, w, &root, &parent, &childList, &nChildren);

    /*
     * Do some cleanup; gotta return "None" if we got an error.
     */

    Tk_DeleteErrorHandler(handler);
    XSync(display, False);
    if (status != 0 && childList != NULL) {
	XFree(childList);
    }
    if (status == 0) {
	parent = None;
    }

    return parent;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_HandleEvent --
 *
 *	Given an event, invoke all the handlers that have been registered for
 *	the event.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Depends on the handlers.
 *
 *----------------------------------------------------------------------
 */

void
Tk_HandleEvent(
    XEvent *eventPtr)	/* Event to dispatch. */
{
    register TkEventHandler *handlerPtr;
    TkWindow *winPtr;
    unsigned long mask;
    InProgress ip;
    Tcl_Interp *interp = NULL;
    ThreadSpecificData *tsdPtr =
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    UpdateButtonEventState(eventPtr);

    /*
     * If the generic handler processed this event we are done and can return.
     */

    if (InvokeGenericHandlers(tsdPtr, eventPtr)) {
	goto releaseUserData;
    }

    if (RefreshKeyboardMappingIfNeeded(eventPtr)) {
	/*
	 * We are done with a MappingNotify event.
	 */

	goto releaseUserData;
    }

    mask = GetEventMaskFromXEvent(eventPtr);
    winPtr = GetTkWindowFromXEvent(eventPtr);

    if (winPtr == NULL) {
	goto releaseUserData;
    }

    /*
     * Once a window has started getting deleted, don't process any more
     * events for it except for the DestroyNotify event. This check is needed
     * because a DestroyNotify handler could re-invoke the event loop, causing
     * other pending events to be handled for the window (the window doesn't
     * get totally expunged from our tables until after the DestroyNotify
     * event has been completely handled).
     */

    if ((winPtr->flags & TK_ALREADY_DEAD)
	    && (eventPtr->type != DestroyNotify)) {
	goto releaseUserData;
    }

    if (winPtr->mainPtr != NULL) {
	int result;

	interp = winPtr->mainPtr->interp;

	/*
	 * Protect interpreter for this window from possible deletion while we
	 * are dealing with the event for this window. Thus, widget writers do
	 * not have to worry about protecting the interpreter in their own
	 * code.
	 */

	Tcl_Preserve(interp);

	result = ((InvokeFocusHandlers(&winPtr, mask, eventPtr))
		|| (InvokeMouseHandlers(winPtr, mask, eventPtr)));

	if (result) {
	    goto releaseInterpreter;
	}
    }

    /*
     * Create the input context for the window if it hasn't already been done
     * (XFilterEvent needs this context). When the event is a FocusIn event,
     * set the input context focus to the receiving window. This code is only
     * ever active for X11.
     */

#ifdef TK_USE_INPUT_METHODS
    if ((winPtr->dispPtr->flags & TK_DISPLAY_USE_IM)) {
	if (!(winPtr->flags & (TK_CHECKED_IC|TK_ALREADY_DEAD))) {
	    winPtr->flags |= TK_CHECKED_IC;
	    if (winPtr->dispPtr->inputMethod != NULL) {
		CreateXIC(winPtr);
	    }
	}
	if (eventPtr->type == FocusIn && winPtr->inputContext != NULL) {
	    XSetICFocus(winPtr->inputContext);
	}
    }
#endif /*TK_USE_INPUT_METHODS*/

    /*
     * For events where it hasn't already been done, update the current time
     * in the display.
     */

    if (eventPtr->type == PropertyNotify) {
	winPtr->dispPtr->lastEventTime = eventPtr->xproperty.time;
    }

    /*
     * There's a potential interaction here with Tk_DeleteEventHandler. Read
     * the documentation for pendingPtr.
     */

    ip.eventPtr = eventPtr;
    ip.winPtr = winPtr;
    ip.nextHandler = NULL;
    ip.nextPtr = tsdPtr->pendingPtr;
    tsdPtr->pendingPtr = &ip;
    if (mask == 0) {
	if ((eventPtr->type == SelectionClear)
		|| (eventPtr->type == SelectionRequest)
		|| (eventPtr->type == SelectionNotify)) {
	    TkSelEventProc((Tk_Window) winPtr, eventPtr);
	} else if (eventPtr->type == ClientMessage) {
	    if (eventPtr->xclient.message_type ==
		    Tk_InternAtom((Tk_Window) winPtr, "WM_PROTOCOLS")) {
		TkWmProtocolEventProc(winPtr, eventPtr);
	    } else {
		InvokeClientMessageHandlers(tsdPtr, (Tk_Window) winPtr,
			eventPtr);
	    }
	}
    } else {
	for (handlerPtr = winPtr->handlerList; handlerPtr != NULL; ) {
	    if ((handlerPtr->mask & mask) != 0) {
		ip.nextHandler = handlerPtr->nextPtr;
		handlerPtr->proc(handlerPtr->clientData, eventPtr);
		handlerPtr = ip.nextHandler;
	    } else {
		handlerPtr = handlerPtr->nextPtr;
	    }
	}

	/*
	 * Pass the event to the "bind" command mechanism. But, don't do this
	 * for SubstructureNotify events. The "bind" command doesn't support
	 * them anyway, and it's easier to filter out these events here than
	 * in the lower-level functions.
	 */

	/*
	 * ...well, except when we use the tkwm patches, in which case we DO
	 * handle CreateNotify events, so we gotta pass 'em through.
	 */

	if ((ip.winPtr != None)
		&& ((mask != SubstructureNotifyMask)
		|| (eventPtr->type == CreateNotify))) {
	    TkBindEventProc(winPtr, eventPtr);
	}
    }
    tsdPtr->pendingPtr = ip.nextPtr;

    /*
     * Release the interpreter for this window so that it can be potentially
     * deleted if requested.
     */

  releaseInterpreter:
    if (interp != NULL) {
	Tcl_Release(interp);
    }

    /*
     * Release the user_data from the event (if it is a virtual event and the
     * field was non-NULL in the first place.) Note that this is done using a
     * Tcl_Obj interface, and we set the field back to NULL afterwards out of
     * paranoia.
     */

  releaseUserData:
    if (eventPtr->type == VirtualEvent) {
	XVirtualEvent *vePtr = (XVirtualEvent *) eventPtr;

	if (vePtr->user_data != NULL) {
	    Tcl_DecrRefCount(vePtr->user_data);
	    vePtr->user_data = NULL;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkEventDeadWindow --
 *
 *	This function is invoked when it is determined that a window is dead.
 *	It cleans up event-related information about the window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Various things get cleaned up and recycled.
 *
 *----------------------------------------------------------------------
 */

void
TkEventDeadWindow(
    TkWindow *winPtr)		/* Information about the window that is being
				 * deleted. */
{
    register TkEventHandler *handlerPtr;
    register InProgress *ipPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    /*
     * While deleting all the handlers, be careful to check for Tk_HandleEvent
     * being about to process one of the deleted handlers. If it is, tell it
     * to quit (all of the handlers are being deleted).
     */

    while (winPtr->handlerList != NULL) {
	handlerPtr = winPtr->handlerList;
	winPtr->handlerList = handlerPtr->nextPtr;
	for (ipPtr = tsdPtr->pendingPtr; ipPtr != NULL;
		ipPtr = ipPtr->nextPtr) {
	    if (ipPtr->nextHandler == handlerPtr) {
		ipPtr->nextHandler = NULL;
	    }
	    if (ipPtr->winPtr == winPtr) {
		ipPtr->winPtr = None;
	    }
	}
	ckfree((char *) handlerPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkCurrentTime --
 *
 *	Try to deduce the current time. "Current time" means the time of the
 *	event that led to the current code being executed, which means the
 *	time in the most recently-nested invocation of Tk_HandleEvent.
 *
 * Results:
 *	The return value is the time from the current event, or CurrentTime if
 *	there is no current event or if the current event contains no time.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Time
TkCurrentTime(
    TkDisplay *dispPtr)		/* Display for which the time is desired. */
{
    register XEvent *eventPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (tsdPtr->pendingPtr == NULL) {
	return dispPtr->lastEventTime;
    }
    eventPtr = tsdPtr->pendingPtr->eventPtr;
    switch (eventPtr->type) {
    case ButtonPress:
    case ButtonRelease:
	return eventPtr->xbutton.time;
    case KeyPress:
    case KeyRelease:
	return eventPtr->xkey.time;
    case MotionNotify:
	return eventPtr->xmotion.time;
    case EnterNotify:
    case LeaveNotify:
	return eventPtr->xcrossing.time;
    case PropertyNotify:
	return eventPtr->xproperty.time;
    }
    return dispPtr->lastEventTime;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_RestrictEvents --
 *
 *	This function is used to globally restrict the set of events that will
 *	be dispatched. The restriction is done by filtering all incoming X
 *	events through a function that determines whether they are to be
 *	processed immediately, deferred, or discarded.
 *
 * Results:
 *	The return value is the previous restriction function in effect, if
 *	there was one, or NULL if there wasn't.
 *
 * Side effects:
 *	From now on, proc will be called to determine whether to process,
 *	defer or discard each incoming X event.
 *
 *----------------------------------------------------------------------
 */

Tk_RestrictProc *
Tk_RestrictEvents(
    Tk_RestrictProc *proc,	/* Function to call for each incoming event */
    ClientData arg,		/* Arbitrary argument to pass to proc. */
    ClientData *prevArgPtr)	/* Place to store information about previous
				 * argument. */
{
    Tk_RestrictProc *prev;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    prev = tsdPtr->restrictProc;
    *prevArgPtr = tsdPtr->restrictArg;
    tsdPtr->restrictProc = proc;
    tsdPtr->restrictArg = arg;
    return prev;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_CollapseMotionEvents --
 *
 *	This function controls whether we collapse motion events in a
 *	particular display or not.
 *
 * Results:
 *	The return value is the previous collapse value in effect.
 *
 * Side effects:
 *	Filtering of motion events may be changed after calling this.
 *
 *----------------------------------------------------------------------
 */

int
Tk_CollapseMotionEvents(
    Display *display,		/* Display handling these events. */
    int collapse)		/* Boolean value that specifies whether motion
				 * events should be collapsed. */
{
    TkDisplay *dispPtr = (TkDisplay *) display;
    int prev = (dispPtr->flags & TK_DISPLAY_COLLAPSE_MOTION_EVENTS);

    if (collapse) {
	dispPtr->flags |= TK_DISPLAY_COLLAPSE_MOTION_EVENTS;
    } else {
	dispPtr->flags &= ~TK_DISPLAY_COLLAPSE_MOTION_EVENTS;
    }
    return prev;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_QueueWindowEvent --
 *
 *	Given an X-style window event, this function adds it to the Tcl event
 *	queue at the given position. This function also performs mouse motion
 *	event collapsing if possible.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Adds stuff to the event queue, which will eventually be processed.
 *
 *----------------------------------------------------------------------
 */

void
Tk_QueueWindowEvent(
    XEvent *eventPtr,		/* Event to add to queue. This function copies
				 * it before adding it to the queue. */
    Tcl_QueuePosition position)	/* Where to put it on the queue:
				 * TCL_QUEUE_TAIL, TCL_QUEUE_HEAD, or
				 * TCL_QUEUE_MARK. */
{
    TkWindowEvent *wevPtr;
    TkDisplay *dispPtr;

    /*
     * Find our display structure for the event's display.
     */

    for (dispPtr = TkGetDisplayList(); ; dispPtr = dispPtr->nextPtr) {
	if (dispPtr == NULL) {
	    return;
	}
	if (dispPtr->display == eventPtr->xany.display) {
	    break;
	}
    }

    /*
     * Don't filter motion events if the user defaulting to true (1), which
     * could be set to false (0) when the user wishes to receive all the
     * motion data)
     */

    if (!(dispPtr->flags & TK_DISPLAY_COLLAPSE_MOTION_EVENTS)) {
	wevPtr = (TkWindowEvent *) ckalloc(sizeof(TkWindowEvent));
	wevPtr->header.proc = WindowEventProc;
	wevPtr->event = *eventPtr;
	Tcl_QueueEvent(&wevPtr->header, position);
	return;
    }

    if ((dispPtr->delayedMotionPtr != NULL) && (position == TCL_QUEUE_TAIL)) {
	if ((eventPtr->type == MotionNotify) && (eventPtr->xmotion.window
		== dispPtr->delayedMotionPtr->event.xmotion.window)) {
	    /*
	     * The new event is a motion event in the same window as the saved
	     * motion event. Just replace the saved event with the new one.
	     */

	    dispPtr->delayedMotionPtr->event = *eventPtr;
	    return;
	} else if ((eventPtr->type != GraphicsExpose)
		&& (eventPtr->type != NoExpose)
		&& (eventPtr->type != Expose)) {
	    /*
	     * The new event may conflict with the saved motion event. Queue
	     * the saved motion event now so that it will be processed before
	     * the new event.
	     */

	    Tcl_QueueEvent(&dispPtr->delayedMotionPtr->header, position);
	    dispPtr->delayedMotionPtr = NULL;
	    Tcl_CancelIdleCall(DelayedMotionProc, (ClientData) dispPtr);
	}
    }

    wevPtr = (TkWindowEvent *) ckalloc(sizeof(TkWindowEvent));
    wevPtr->header.proc = WindowEventProc;
    wevPtr->event = *eventPtr;
    if ((eventPtr->type == MotionNotify) && (position == TCL_QUEUE_TAIL)) {
	/*
	 * The new event is a motion event so don't queue it immediately; save
	 * it around in case another motion event arrives that it can be
	 * collapsed with.
	 */

	if (dispPtr->delayedMotionPtr != NULL) {
	    Tcl_Panic("Tk_QueueWindowEvent found unexpected delayed motion event");
	}
	dispPtr->delayedMotionPtr = wevPtr;
	Tcl_DoWhenIdle(DelayedMotionProc, (ClientData) dispPtr);
    } else {
	Tcl_QueueEvent(&wevPtr->header, position);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkQueueEventForAllChildren --
 *
 *	Given an XEvent, recursively queue the event for this window and all
 *	non-toplevel children of the given window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Events queued.
 *
 *----------------------------------------------------------------------
 */

void
TkQueueEventForAllChildren(
    TkWindow *winPtr,	    /* Window to which event is sent. */
    XEvent *eventPtr)	    /* The event to be sent. */
{
    TkWindow *childPtr;

    if (!Tk_IsMapped(winPtr)) {
	return;
    }

    eventPtr->xany.window = winPtr->window;
    Tk_QueueWindowEvent(eventPtr, TCL_QUEUE_TAIL);

    childPtr = winPtr->childList;
    while (childPtr != NULL) {
	if (!Tk_TopWinHierarchy(childPtr)) {
	    TkQueueEventForAllChildren(childPtr, eventPtr);
	}
	childPtr = childPtr->nextPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * WindowEventProc --
 *
 *	This function is called by Tcl_DoOneEvent when a window event reaches
 *	the front of the event queue. This function is responsible for
 *	actually handling the event.
 *
 * Results:
 *	Returns 1 if the event was handled, meaning it should be removed from
 *	the queue. Returns 0 if the event was not handled, meaning it should
 *	stay on the queue. The event isn't handled if the TCL_WINDOW_EVENTS
 *	bit isn't set in flags, if a restrict proc prevents the event from
 *	being handled.
 *
 * Side effects:
 *	Whatever the event handlers for the event do.
 *
 *----------------------------------------------------------------------
 */

static int
WindowEventProc(
    Tcl_Event *evPtr,		/* Event to service. */
    int flags)			/* Flags that indicate what events to handle,
				 * such as TCL_WINDOW_EVENTS. */
{
    TkWindowEvent *wevPtr = (TkWindowEvent *) evPtr;
    Tk_RestrictAction result;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (!(flags & TCL_WINDOW_EVENTS)) {
	return 0;
    }
    if (tsdPtr->restrictProc != NULL) {
	result = tsdPtr->restrictProc(tsdPtr->restrictArg, &wevPtr->event);
	if (result != TK_PROCESS_EVENT) {
	    if (result == TK_DEFER_EVENT) {
		return 0;
	    } else {
		/*
		 * TK_DELETE_EVENT: return and say we processed the event,
		 * even though we didn't do anything at all.
		 */

		return 1;
	    }
	}
    }
    Tk_HandleEvent(&wevPtr->event);
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * DelayedMotionProc --
 *
 *	This function is invoked as an idle handler when a mouse motion event
 *	has been delayed. It queues the delayed event so that it will finally
 *	be serviced.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The delayed mouse motion event gets added to the Tcl event queue for
 *	servicing.
 *
 *----------------------------------------------------------------------
 */

static void
DelayedMotionProc(
    ClientData clientData)	/* Pointer to display containing a delayed
				 * motion event to be serviced. */
{
    TkDisplay *dispPtr = (TkDisplay *) clientData;

    if (dispPtr->delayedMotionPtr == NULL) {
	Tcl_Panic("DelayedMotionProc found no delayed mouse motion event");
    }
    Tcl_QueueEvent(&dispPtr->delayedMotionPtr->header, TCL_QUEUE_TAIL);
    dispPtr->delayedMotionPtr = NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TkCreateExitHandler --
 *
 *	Same as Tcl_CreateExitHandler, but private to Tk.
 *
 * Results:
 *	None.
 *
 * Side effects.
 *	Sets a handler with Tcl_CreateExitHandler if this is the first call.
 *
 *----------------------------------------------------------------------
 */

void
TkCreateExitHandler(
    Tcl_ExitProc *proc,		/* Function to invoke. */
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr;

    exitPtr = (ExitHandler *) ckalloc(sizeof(ExitHandler));
    exitPtr->proc = proc;
    exitPtr->clientData = clientData;
    Tcl_MutexLock(&exitMutex);

    /*
     * The call to TclInExit() is disabled here. That's a private Tcl routine,
     * and calling it is causing some trouble with portability of building Tk.
     * We should avoid private Tcl routines generally.
     *
     * In this case, the TclInExit() call is being used only to prevent a
     * Tcl_CreateExitHandler() call when Tcl finalization is in progress.
     * That's a situation that shouldn't happen anyway. Recent changes within
     * Tcl_Finalize now cause a Tcl_Panic() to happen if exit handlers get
     * added after exit handling is complete. By disabling the guard here,
     * that panic will serve to help us find the buggy conditions and correct
     * them.
     *
     * We can restore this guard if we find we must (hopefully getting public
     * access to TclInExit() if we discover extensions really do need this),
     * but during alpha development, this is a good time to dig in and find
     * the root causes of finalization bugs.
     */

    if (firstExitPtr == NULL/* && !TclInExit()*/) {
	Tcl_CreateExitHandler(TkFinalize, NULL);
    }
    exitPtr->nextPtr = firstExitPtr;
    firstExitPtr = exitPtr;
    Tcl_MutexUnlock(&exitMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * TkDeleteExitHandler --
 *
 *	Same as Tcl_DeleteExitHandler, but private to Tk.
 *
 * Results:
 *	None.
 *
 * Side effects.
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkDeleteExitHandler(
    Tcl_ExitProc *proc,		/* Function that was previously registered. */
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr, *prevPtr;

    Tcl_MutexLock(&exitMutex);
    for (prevPtr = NULL, exitPtr = firstExitPtr; exitPtr != NULL;
	    prevPtr = exitPtr, exitPtr = exitPtr->nextPtr) {
	if ((exitPtr->proc == proc)
		&& (exitPtr->clientData == clientData)) {
	    if (prevPtr == NULL) {
		firstExitPtr = exitPtr->nextPtr;
	    } else {
		prevPtr->nextPtr = exitPtr->nextPtr;
	    }
	    ckfree((char *) exitPtr);
	    break;
	}
    }
    Tcl_MutexUnlock(&exitMutex);
    return;
}

/*
 *----------------------------------------------------------------------
 *
 * TkCreateThreadExitHandler --
 *
 *	Same as Tcl_CreateThreadExitHandler, but private to Tk.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Proc will be invoked with clientData as argument when the application
 *	exits.
 *
 *----------------------------------------------------------------------
 */

void
TkCreateThreadExitHandler(
    Tcl_ExitProc *proc,		/* Function to invoke. */
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    exitPtr = (ExitHandler *) ckalloc(sizeof(ExitHandler));
    exitPtr->proc = proc;
    exitPtr->clientData = clientData;

    /*
     * See comments in TkCreateExitHandler().
     */

    if (tsdPtr->firstExitPtr == NULL/* && !TclInExit()*/) {
	Tcl_CreateThreadExitHandler(TkFinalizeThread, NULL);
    }
    exitPtr->nextPtr = tsdPtr->firstExitPtr;
    tsdPtr->firstExitPtr = exitPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkDeleteThreadExitHandler --
 *
 *	Same as Tcl_DeleteThreadExitHandler, but private to Tk.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If there is an exit handler corresponding to proc and clientData then
 *	it is cancelled; if no such handler exists then nothing happens.
 *
 *----------------------------------------------------------------------
 */

void
TkDeleteThreadExitHandler(
    Tcl_ExitProc *proc,		/* Function that was previously registered. */
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr, *prevPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    for (prevPtr = NULL, exitPtr = tsdPtr->firstExitPtr; exitPtr != NULL;
	    prevPtr = exitPtr, exitPtr = exitPtr->nextPtr) {
	if ((exitPtr->proc == proc)
		&& (exitPtr->clientData == clientData)) {
	    if (prevPtr == NULL) {
		tsdPtr->firstExitPtr = exitPtr->nextPtr;
	    } else {
		prevPtr->nextPtr = exitPtr->nextPtr;
	    }
	    ckfree((char *) exitPtr);
	    return;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkFinalize --
 *
 *	Runs our private exit handlers and removes itself from Tcl. This is
 *	benificial should we want to protect from dangling pointers should the
 *	Tk shared library be unloaded prior to Tcl which can happen on windows
 *	should the process be forcefully exiting from an exception handler.
 *
 * Results:
 *	None.
 *
 * Side effects.
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkFinalize(
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr;

    Tcl_DeleteExitHandler(TkFinalize, NULL);

    Tcl_MutexLock(&exitMutex);
    for (exitPtr = firstExitPtr; exitPtr != NULL; exitPtr = firstExitPtr) {
	/*
	 * Be careful to remove the handler from the list before invoking its
	 * callback. This protects us against double-freeing if the callback
	 * should call TkDeleteExitHandler on itself.
	 */

	firstExitPtr = exitPtr->nextPtr;
	Tcl_MutexUnlock(&exitMutex);
	exitPtr->proc(exitPtr->clientData);
	ckfree((char *) exitPtr);
	Tcl_MutexLock(&exitMutex);
    }
    firstExitPtr = NULL;
    Tcl_MutexUnlock(&exitMutex);
}

/*
 *----------------------------------------------------------------------
 *
 * TkFinalizeThread --
 *
 *	Runs our private thread exit handlers and removes itself from Tcl.
 *	This is benificial should we want to protect from dangling pointers
 *	should the Tk shared library be unloaded prior to Tcl which can happen
 *	on Windows should the process be forcefully exiting from an exception
 *	handler.
 *
 * Results:
 *	None.
 *
 * Side effects.
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkFinalizeThread(
    ClientData clientData)	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    Tcl_DeleteThreadExitHandler(TkFinalizeThread, NULL);

    if (tsdPtr != NULL) {
	tsdPtr->inExit = 1;

	for (exitPtr = tsdPtr->firstExitPtr; exitPtr != NULL;
		exitPtr = tsdPtr->firstExitPtr) {
	    /*
	     * Be careful to remove the handler from the list before invoking
	     * its callback. This protects us against double-freeing if the
	     * callback should call TkDeleteThreadExitHandler on itself.
	     */

	    tsdPtr->firstExitPtr = exitPtr->nextPtr;
	    exitPtr->proc(exitPtr->clientData);
	    ckfree((char *) exitPtr);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_MainLoop --
 *
 *	Call Tcl_DoOneEvent over and over again in an infinite loop as long as
 *	there exist any main windows.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Arbitrary; depends on handlers for events.
 *
 *----------------------------------------------------------------------
 */

void
Tk_MainLoop(void)
{
    while (Tk_GetNumMainWindows() > 0) {
	Tcl_DoOneEvent(0);
    }
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */