Tcl Source Code

Changes On Branch tip-458
Login
Bounty program for improvements to Tcl and certain Tcl packages.

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Changes In Branch tip-458 Excluding Merge-Ins

This is equivalent to a diff from a4fd5b790b to 50be45e71e

2017-05-18
12:33
TIP #458 implementation: Add Support for epoll() and kqueue() in the Notifier check-in: 858569fb04 user: jan.nijtmans tags: trunk
2017-05-05
19:11
[6015221f59] Segfault after overflow of [binary] field specifier numeric count. check-in: 5c07ae32cf user: dgp tags: trunk
2017-05-04
22:27
Add [info linkedname] introspection command check-in: 6ed76df29d user: mlafon tags: info-linkedname
14:51
merge trunk Closed-Leaf check-in: 50be45e71e user: dgp tags: tip-458
14:19
merge trunk check-in: ab6adfa911 user: jan.nijtmans tags: win-console-panic
12:39
Merge trunk check-in: 6928ad7045 user: jan.nijtmans tags: novem
12:28
merge core-8-6-branch check-in: a4fd5b790b user: jan.nijtmans tags: trunk
12:26
Use GetModuleHandle() in stead of LoadLibrary() for ntdll, which is already loaded by Cygwin. check-in: a4717aa947 user: jan.nijtmans tags: core-8-6-branch
09:51
merge core-8-6-branch check-in: 790adcb1b9 user: jan.nijtmans tags: trunk
08:55
merge trunk check-in: 9a065b2341 user: jan.nijtmans tags: tip-458

Changes to unix/Makefile.in.

341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
...
561
562
563
564
565
566
567
568


569
570
571
572
573
574
575
....
1555
1556
1557
1558
1559
1560
1561
1562
1563






1564
1565
1566
1567
1568
1569
1570
	${COMPAT_OBJS}

UNIX_OBJS = tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o \
	tclUnixFile.o tclUnixPipe.o tclUnixSock.o \
	tclUnixTime.o tclUnixInit.o tclUnixThrd.o \
	tclUnixCompat.o

NOTIFY_OBJS = tclUnixNotfy.o

MAC_OSX_OBJS = tclMacOSXBundle.o tclMacOSXFCmd.o tclMacOSXNotify.o

CYGWIN_OBJS = tclWinError.o

DTRACE_OBJ = tclDTrace.o

................................................................................
	$(UNIX_DIR)/tclUnixTest.c \
	$(UNIX_DIR)/tclUnixThrd.c \
	$(UNIX_DIR)/tclUnixTime.c \
	$(UNIX_DIR)/tclUnixInit.c \
	$(UNIX_DIR)/tclUnixCompat.c

NOTIFY_SRCS = \
	$(UNIX_DIR)/tclUnixNotfy.c



DL_SRCS = \
	$(UNIX_DIR)/tclLoadAix.c \
	$(UNIX_DIR)/tclLoadDl.c \
	$(UNIX_DIR)/tclLoadDl2.c \
	$(UNIX_DIR)/tclLoadDld.c \
	$(UNIX_DIR)/tclLoadDyld.c \
................................................................................

tclUnixFCmd.o: $(UNIX_DIR)/tclUnixFCmd.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFCmd.c

tclUnixFile.o: $(UNIX_DIR)/tclUnixFile.c $(FSHDR)
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFile.c

tclUnixNotfy.o: $(UNIX_DIR)/tclUnixNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixNotfy.c







tclUnixPipe.o: $(UNIX_DIR)/tclUnixPipe.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixPipe.c

tclUnixSock.o: $(UNIX_DIR)/tclUnixSock.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixSock.c







|







 







|
>
>







 







|
|
>
>
>
>
>
>







341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
...
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
....
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
	${COMPAT_OBJS}

UNIX_OBJS = tclUnixChan.o tclUnixEvent.o tclUnixFCmd.o \
	tclUnixFile.o tclUnixPipe.o tclUnixSock.o \
	tclUnixTime.o tclUnixInit.o tclUnixThrd.o \
	tclUnixCompat.o

NOTIFY_OBJS = tclEpollNotfy.o tclKqueueNotfy.o tclSelectNotfy.o

MAC_OSX_OBJS = tclMacOSXBundle.o tclMacOSXFCmd.o tclMacOSXNotify.o

CYGWIN_OBJS = tclWinError.o

DTRACE_OBJ = tclDTrace.o

................................................................................
	$(UNIX_DIR)/tclUnixTest.c \
	$(UNIX_DIR)/tclUnixThrd.c \
	$(UNIX_DIR)/tclUnixTime.c \
	$(UNIX_DIR)/tclUnixInit.c \
	$(UNIX_DIR)/tclUnixCompat.c

NOTIFY_SRCS = \
	$(UNIX_DIR)/tclEpollNotfy.c \
	$(UNIX_DIR)/tclKqueueNotfy.c \
	$(UNIX_DIR)/tclSelectNotfy.c

DL_SRCS = \
	$(UNIX_DIR)/tclLoadAix.c \
	$(UNIX_DIR)/tclLoadDl.c \
	$(UNIX_DIR)/tclLoadDl2.c \
	$(UNIX_DIR)/tclLoadDld.c \
	$(UNIX_DIR)/tclLoadDyld.c \
................................................................................

tclUnixFCmd.o: $(UNIX_DIR)/tclUnixFCmd.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFCmd.c

tclUnixFile.o: $(UNIX_DIR)/tclUnixFile.c $(FSHDR)
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixFile.c

tclEpollNotfy.o: $(UNIX_DIR)/tclEpollNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclEpollNotfy.c

tclKqueueNotfy.o: $(UNIX_DIR)/tclKqueueNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclKqueueNotfy.c

tclSelectNotfy.o: $(UNIX_DIR)/tclSelectNotfy.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclSelectNotfy.c

tclUnixPipe.o: $(UNIX_DIR)/tclUnixPipe.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixPipe.c

tclUnixSock.o: $(UNIX_DIR)/tclUnixSock.c
	$(CC) -c $(CC_SWITCHES) $(UNIX_DIR)/tclUnixSock.c

Changes to unix/configure.

8434
8435
8436
8437
8438
8439
8440














































































8441
8442
8443
8444
8445
8446
8447
    fi
fi
if test $tcl_ok = no; then

$as_echo "#define NO_FD_SET 1" >>confdefs.h

fi















































































#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------


    for ac_header in sys/time.h






>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
8463
8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
    fi
fi
if test $tcl_ok = no; then

$as_echo "#define NO_FD_SET 1" >>confdefs.h

fi

#------------------------------------------------------------------------
#	Options for the notifier. Checks for epoll(7) on Linux, and
#	kqueue(2) on {DragonFly,Free,Net,Open}BSD
#------------------------------------------------------------------------

{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for advanced notifier support" >&5
$as_echo_n "checking for advanced notifier support... " >&6; }
case x`uname -s` in
  xLinux)
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: epoll(7)" >&5
$as_echo "epoll(7)" >&6; }
	for ac_header in sys/epoll.h
do :
  ac_fn_c_check_header_mongrel "$LINENO" "sys/epoll.h" "ac_cv_header_sys_epoll_h" "$ac_includes_default"
if test "x$ac_cv_header_sys_epoll_h" = xyes; then :
  cat >>confdefs.h <<_ACEOF
#define HAVE_SYS_EPOLL_H 1
_ACEOF

$as_echo "#define NOTIFIER_EPOLL 1" >>confdefs.h

fi

done

	for ac_header in sys/eventfd.h
do :
  ac_fn_c_check_header_mongrel "$LINENO" "sys/eventfd.h" "ac_cv_header_sys_eventfd_h" "$ac_includes_default"
if test "x$ac_cv_header_sys_eventfd_h" = xyes; then :
  cat >>confdefs.h <<_ACEOF
#define HAVE_SYS_EVENTFD_H 1
_ACEOF

$as_echo "#define HAVE_EVENTFD 1" >>confdefs.h

fi

done
;;
  xDragonFlyBSD|xFreeBSD|xNetBSD|xOpenBSD)
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: kqueue(2)" >&5
$as_echo "kqueue(2)" >&6; }
	# Messy because we want to check if *all* the headers are present, and not
	# just *any*
	tcl_kqueue_headers=x
	for ac_header in sys/types.h sys/event.h sys/time.h
do :
  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
  cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
_ACEOF
 tcl_kqueue_headers=${tcl_kqueue_headers}y
fi

done

	if test $tcl_kqueue_headers = xyyy; then :


$as_echo "#define NOTIFIER_KQUEUE 1" >>confdefs.h

fi;;
  xDarwin)
	# Assume that we've got CoreFoundation present (checked elsewhere because
	# of wider impact).
	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: OSX" >&5
$as_echo "OSX" >&6; };;
  *)
	cat >>confdefs.h <<_ACEOF
#define NOTIFIER_SELECT 1
_ACEOF

	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: none" >&5
$as_echo "none" >&6; };;
esac

#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------


    for ac_header in sys/time.h

Changes to unix/configure.ac.

295
296
297
298
299
300
301































302
303
304
305
306
307
308
	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Should we include <sys/select.h>?])
	tcl_ok=yes
    fi
fi
if test $tcl_ok = no; then
    AC_DEFINE(NO_FD_SET, 1, [Do we have fd_set?])
fi
































#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------

SC_TIME_HANDLER







>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







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
	AC_DEFINE(HAVE_SYS_SELECT_H, 1, [Should we include <sys/select.h>?])
	tcl_ok=yes
    fi
fi
if test $tcl_ok = no; then
    AC_DEFINE(NO_FD_SET, 1, [Do we have fd_set?])
fi

#------------------------------------------------------------------------
#	Options for the notifier. Checks for epoll(7) on Linux, and
#	kqueue(2) on {DragonFly,Free,Net,Open}BSD
#------------------------------------------------------------------------

AC_MSG_CHECKING([for advanced notifier support])
case x`uname -s` in
  xLinux)
	AC_MSG_RESULT([epoll(7)])
	AC_CHECK_HEADERS([sys/epoll.h],
	    [AC_DEFINE(NOTIFIER_EPOLL, [1], [Is epoll(7) supported?])])
	AC_CHECK_HEADERS([sys/eventfd.h],
	    [AC_DEFINE(HAVE_EVENTFD, [1], [Is eventfd(2) supported?])]);;
  xDragonFlyBSD|xFreeBSD|xNetBSD|xOpenBSD)
	AC_MSG_RESULT([kqueue(2)])
	# Messy because we want to check if *all* the headers are present, and not
	# just *any*
	tcl_kqueue_headers=x
	AC_CHECK_HEADERS([sys/types.h sys/event.h sys/time.h],
	    [tcl_kqueue_headers=${tcl_kqueue_headers}y])
	AS_IF([test $tcl_kqueue_headers = xyyy], [
	    AC_DEFINE(NOTIFIER_KQUEUE, [1], [Is kqueue(2) supported?])]);;
  xDarwin)
	# Assume that we've got CoreFoundation present (checked elsewhere because
	# of wider impact).
	AC_MSG_RESULT([OSX]);;
  *)
	AC_DEFINE_UNQUOTED(NOTIFIER_SELECT)
	AC_MSG_RESULT([none]);;
esac

#------------------------------------------------------------------------------
#       Find out all about time handling differences.
#------------------------------------------------------------------------------

SC_TIME_HANDLER

Added unix/tclEpollNotfy.c.








































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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
/*
 * tclEpollNotfy.c --
 *
 *	This file contains the implementation of the epoll()-based
 *	Linux-specific notifier, which is the lowest-level part of the
 *	Tcl event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio Andrés Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#ifdef NOTIFIER_EPOLL

#define _GNU_SOURCE		/* For pipe2(2) */
#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <fcntl.h>
#include <signal.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/queue.h>
#include <unistd.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

struct PlatformEventData;
typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
    LIST_ENTRY(FileHandler) readyNode;
				/* Next/previous in list of FileHandlers asso-
				 * ciated with regular files (S_IFREG) that are
				 * ready for I/O. */
    struct PlatformEventData *pedPtr;
				/* Pointer to PlatformEventData associating this
				 * FileHandler with epoll(7) events. */
} FileHandler;

/*
 * The following structure associates a FileHandler and the thread that owns it
 * with the file descriptors of interest and their event masks passed to epoll_ctl(2)
 * and their corresponding event(s) returned by epoll_wait(2).
 */

struct ThreadSpecificData;
struct PlatformEventData {
    FileHandler *filePtr;
    struct ThreadSpecificData *tsdPtr;
};

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * epoll based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

LIST_HEAD(PlatformReadyFileHandlerList, FileHandler);
typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    struct PlatformReadyFileHandlerList firstReadyFileHandlerPtr;
				/* Pointer to head of list of FileHandlers
				 * associated with regular files (S_IFREG)
				 * that are ready for I/O. */
    pthread_mutex_t notifierMutex;
				/* Mutex protecting notifier termination in
				 * PlatformEventsFinalize. */
#ifdef HAVE_EVENTFD
    int triggerEventFd;		/* eventfd(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
#else
    int triggerPipe[2];		/* pipe(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
#endif /* HAVE_EVENTFD */
    int eventsFd;		/* epoll(7) file descriptor used to wait for fds */
    struct epoll_event *readyEvents;
				/* Pointer to at most maxReadyEvents events
				 * returned by epoll_wait(2). */
    size_t maxReadyEvents;	/* Count of epoll_events in readyEvents. */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;
 
void PlatformEventsControl(FileHandler *filePtr, ThreadSpecificData *tsdPtr, int op, int isNew);
static void PlatformEventsFinalize(void);
void PlatformEventsInit(void);
static int PlatformEventsTranslate(struct epoll_event *event);
static int PlatformEventsWait(struct epoll_event *events, size_t numEvents, struct timeval *timePtr);
 
#include "tclUnixNotfy.c"
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	If no initNotifierProc notifier hook exists, PlatformEventsInit
 *	is called.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	PlatformEventsInit();
	return tsdPtr;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If no finalizeNotifierProc notifier hook exists, PlatformEvents-
 *	Finalize is called.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
	PlatformEventsFinalize();
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsControl --
 *
 *	This function registers interest for the file descriptor and the mask
 *	of TCL_* bits associated with filePtr on the epoll file descriptor
 *	associated with tsdPtr.
 *	Future calls to epoll_wait will return filePtr and tsdPtr alongside with
 *	the event registered here via the PlatformEventData struct.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If adding a new file descriptor, a PlatformEventData struct will be
 *	allocated and associated with filePtr.
 *	fstat is called on the file descriptor; if it is associated with
 *	a regular file (S_IFREG,) filePtr is considered to be ready for I/O
 *	and added to or deleted from the corresponding list in tsdPtr.
 *	If it is not associated with a regular file, the file descriptor is
 *	added, modified concerning its mask of events of interest, or deleted
 *	from the epoll file descriptor of the calling thread.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsControl(
	FileHandler *filePtr,
	ThreadSpecificData *tsdPtr,
	int op,
	int isNew)
{
    struct epoll_event newEvent;
    struct PlatformEventData *newPedPtr;
    struct stat fdStat;

    newEvent.events = 0;
    if (filePtr->mask & (TCL_READABLE | TCL_EXCEPTION)) {
	newEvent.events |= EPOLLIN;
    }
    if (filePtr->mask & TCL_WRITABLE) {
	newEvent.events |= EPOLLOUT;
    }
    if (isNew) {
        newPedPtr = ckalloc(sizeof(*newPedPtr));
        newPedPtr->filePtr = filePtr;
        newPedPtr->tsdPtr = tsdPtr;
	filePtr->pedPtr = newPedPtr;
    }
    newEvent.data.ptr = filePtr->pedPtr;

    /*
     * N.B.	As discussed in Tcl_WaitForEvent(), epoll(7) does not sup-
     *		port regular files (S_IFREG.) Therefore, filePtr is in these
     *		cases simply added or deleted from the list of FileHandlers
     *		associated with regular files belonging to tsdPtr.
     */

    if (fstat(filePtr->fd, &fdStat) == -1) {
	Tcl_Panic("fstat: %s", strerror(errno));
    } else if ((fdStat.st_mode & S_IFMT) == S_IFREG) {
	switch (op) {
	case EPOLL_CTL_ADD:
	    if (isNew) {
		LIST_INSERT_HEAD(&tsdPtr->firstReadyFileHandlerPtr, filePtr, readyNode);
	    }
	    break;
	case EPOLL_CTL_DEL:
	    LIST_REMOVE(filePtr, readyNode);
	    break;
	}
	return;
   } else if (epoll_ctl(tsdPtr->eventsFd, op, filePtr->fd, &newEvent) == -1) {
	Tcl_Panic("epoll_ctl: %s", strerror(errno));
   }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsFinalize --
 *
 *	This function closes the eventfd and the epoll file descriptor and
 *	frees the epoll_event structs owned by the thread of the caller.
 *	The above operations are protected by tsdPtr->notifierMutex, which
 *	is destroyed thereafter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 * 	While tsdPtr->notifierMutex is held:
 *	The per-thread eventfd(2) is closed, if non-zero, and set to -1.
 *	The per-thread epoll(7) fd is closed, if non-zero, and set to 0.
 *	The per-thread epoll_event structs are freed, if any, and set to 0.
 *
 *	tsdPtr->notifierMutex is destroyed.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsFinalize(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    pthread_mutex_lock(&tsdPtr->notifierMutex);
#ifdef HAVE_EVENTFD
    if (tsdPtr->triggerEventFd) {
	close(tsdPtr->triggerEventFd);
	tsdPtr->triggerEventFd = -1;
    }
#else
    if (tsdPtr->triggerPipe[0]) {
	close(tsdPtr->triggerPipe[0]);
	tsdPtr->triggerPipe[0] = -1;
    }
    if (tsdPtr->triggerPipe[1]) {
	close(tsdPtr->triggerPipe[1]);
	tsdPtr->triggerPipe[1] = -1;
    }
#endif /* HAVE_EVENTFD */
    if (tsdPtr->eventsFd > 0) {
	close(tsdPtr->eventsFd);
	tsdPtr->eventsFd = 0;
    }
    if (tsdPtr->readyEvents) {
	ckfree(tsdPtr->readyEvents);
	tsdPtr->maxReadyEvents = 0;
    }
    pthread_mutex_unlock(&tsdPtr->notifierMutex);
    if ((errno = pthread_mutex_destroy(&tsdPtr->notifierMutex))) {
	Tcl_Panic("pthread_mutex_destroy: %s", strerror(errno));
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsInit --
 *
 *	This function abstracts creating a kqueue fd via the epoll_create
 *	system call and allocating memory for the epoll_event structs in
 *	tsdPtr for the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The following per-thread entities are initialised:
 *	notifierMutex is initialised.
 *	The eventfd(2) is created w/ EFD_CLOEXEC and EFD_NONBLOCK.
 *	The epoll(7) fd is created w/ EPOLL_CLOEXEC.
 *	A FileHandler struct is allocated and initialised for the event-
 *	fd(2), registering interest for TCL_READABLE on it via Platform-
 *	EventsControl().
 *	readyEvents and maxReadyEvents are initialised with 512 epoll_events.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsInit(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    FileHandler *filePtr;

    errno = pthread_mutex_init(&tsdPtr->notifierMutex, NULL);
    if (errno) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create mutex");
    }
    filePtr = ckalloc(sizeof(*filePtr));
#ifdef HAVE_EVENTFD
    if ((tsdPtr->triggerEventFd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK)) <= 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger eventfd");
    }
    filePtr->fd = tsdPtr->triggerEventFd;
#else
    if (pipe2(tsdPtr->triggerPipe, O_CLOEXEC | O_NONBLOCK) != 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger pipe");
    }
    filePtr->fd = tsdPtr->triggerPipe[0];
#endif
    if ((tsdPtr->eventsFd = epoll_create1(EPOLL_CLOEXEC)) == -1) {
	Tcl_Panic("epoll_create1: %s", strerror(errno));
    }
    filePtr->mask = TCL_READABLE;
    PlatformEventsControl(filePtr, tsdPtr, EPOLL_CTL_ADD, 1);
    if (!tsdPtr->readyEvents) {
        tsdPtr->maxReadyEvents = 512;
	tsdPtr->readyEvents = ckalloc(tsdPtr->maxReadyEvents
	    * sizeof(tsdPtr->readyEvents[0]));
    }
    LIST_INIT(&tsdPtr->firstReadyFileHandlerPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsTranslate --
 *
 *	This function translates the platform-specific mask of returned
 *	events in eventPtr to a mask of TCL_* bits.
 *
 * Results:
 *	Returns the translated mask.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsTranslate(
	struct epoll_event *eventPtr)
{
    int mask;

    mask = 0;
    if (eventPtr->events & (EPOLLIN | EPOLLHUP)) {
	mask |= TCL_READABLE;
    }
    if (eventPtr->events & EPOLLOUT) {
	mask |= TCL_WRITABLE;
    }
    if (eventPtr->events & EPOLLERR) {
	mask |= TCL_EXCEPTION;
    }
    return mask;
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsWait --
 *
 *	This function abstracts waiting for I/O events via epoll_wait.
 *
 * Results:
 *	Returns -1 if epoll_wait failed. Returns 0 if polling and if no
 *	events became available whilst polling. Returns a pointer to and
 *	the count of all returned events in all other cases.
 *
 * Side effects:
 *	gettimeofday(2), epoll_wait(2), and gettimeofday(2) are called,
 *	in the specified order.
 *	If timePtr specifies a positive value, it is updated to reflect
 *	the amount of time that has passed; if its value would {under,
 *	over}flow, it is set to zero.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsWait(
    struct epoll_event *events,
    size_t numEvents,
    struct timeval *timePtr)
{
    int numFound;
    struct timeval tv0, tv1, tv_delta;
    int timeout;

    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * If timePtr is NULL, epoll_wait(2) will wait indefinitely. If it
     * specifies a timeout of {0,0}, epoll_wait(2) will poll. Otherwise,
     * the timeout will simply be converted to milliseconds.
     */

    if (!timePtr) {
	timeout = -1;
    } else if (!timePtr->tv_sec && !timePtr->tv_usec) {
	timeout = 0;
    } else {
	timeout = (int)timePtr->tv_sec;
    }

    /*
     * Call (and possibly block on) epoll_wait(2) and substract the delta
     * of gettimeofday(2) before and after the call from timePtr if the
     * latter is not NULL. Return the number of events returned by epoll_wait(2).
     */

    gettimeofday(&tv0, NULL);
    numFound = epoll_wait(tsdPtr->eventsFd, events, (int)numEvents, timeout);
    gettimeofday(&tv1, NULL);
    if (timePtr && (timePtr->tv_sec && timePtr->tv_usec)) {
	timersub(&tv1, &tv0, &tv_delta);
	if (!timercmp(&tv_delta, timePtr, >)) {
		timersub(timePtr, &tv_delta, timePtr);
	} else {
		timePtr->tv_sec = 0;
		timePtr->tv_usec = 0;
	}
    }
    return numFound;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the epoll notifier
 *	of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *	PlatformEventsControl() is called for the new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    int isNew;

    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	    isNew = 1;
	} else {
	    isNew = 0;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	PlatformEventsControl(filePtr, tsdPtr, isNew ?
	    EPOLL_CTL_ADD : EPOLL_CTL_MOD, isNew);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file on
 *	the epoll file descriptor of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *	PlatformEventsControl() is called for the file handler structure.
 *	The PlatformEventData struct associated with the new file handler
 *	structure is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	PlatformEventsControl(filePtr, tsdPtr, EPOLL_CTL_DEL, 0);
	if (filePtr->pedPtr) {
	    ckfree(filePtr->pedPtr);
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *	The waiting logic is implemented in PlatformEventsWait.
 *
 * Results:
 *	Returns -1 if PlatformEventsWait() would block forever, otherwise
 *	returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by PlatformEventsWait().
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular epoll_wait()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound, numEvent;
	struct PlatformEventData *pedPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	int numQueued;
	ssize_t i;

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else {
	    timeoutPtr = NULL;
	}

	/*
	 * Walk the list of FileHandlers associated with regular files
	 * (S_IFREG) belonging to tsdPtr, queue Tcl events for them, and
	 * update their mask of events of interest.
	 * As epoll(7) does not support regular files, the behaviour of
	 * {select,poll}(2) is simply simulated here: fds associated with
	 * regular files are added to this list by PlatformEventsControl()
	 * and processed here before calling (and possibly blocking) on
	 * PlatformEventsWait().
	 */

	numQueued = 0;
	LIST_FOREACH(filePtr, &tsdPtr->firstReadyFileHandlerPtr, readyNode) {
	    mask = 0;
	    if (filePtr->mask & TCL_READABLE) {
		mask |= TCL_READABLE;
	    }
	    if (filePtr->mask & TCL_WRITABLE) {
		mask |= TCL_WRITABLE;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
		    ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
		numQueued++;
	    }
	    filePtr->readyMask = mask;
	}

	/*
	 * If any events were queued in the above loop, force PlatformEvents-
	 * Wait() to poll as there already are events that need to be processed
	 * at this point.
	 */

	if (numQueued) {
	    timeout.tv_sec = 0;
	    timeout.tv_usec = 0;
	    timeoutPtr = &timeout;
	}

	/*
	 * Wait or poll for new events, queue Tcl events for the FileHandlers
	 * corresponding to them, and update the FileHandlers' mask of events
	 * of interest registered by the last call to Tcl_CreateFileHandler().
	 *
	 * Events for the eventfd(2)/trigger pipe are processed here in order
	 * to facilitate inter-thread IPC. If another thread intends to wake
	 * up this thread whilst it's blocking on PlatformEventsWait(), it
	 * write(2)s to the eventfd(2)/trigger pipe (see Tcl_AlertNotifier(),)
	 * which in turn will cause PlatformEventsWait() to return immediately.
	 */

	numFound = PlatformEventsWait(tsdPtr->readyEvents, tsdPtr->maxReadyEvents, timeoutPtr);
	for (numEvent = 0; numEvent < numFound; numEvent++) {
	    pedPtr = tsdPtr->readyEvents[numEvent].data.ptr;
	    filePtr = pedPtr->filePtr;
	    mask = PlatformEventsTranslate(&tsdPtr->readyEvents[numEvent]);
#ifdef HAVE_EVENTFD
	    if (filePtr->fd == tsdPtr->triggerEventFd) {
		uint64_t eventFdVal;
		i = read(tsdPtr->triggerEventFd, &eventFdVal, sizeof(eventFdVal));
		if ((i != sizeof(eventFdVal)) && (errno != EAGAIN)) {
#else
	    if (filePtr->fd == tsdPtr->triggerPipe[0]) {
		char triggerPipeVal;
		i = read(tsdPtr->triggerPipe[0], &triggerPipeVal, sizeof(triggerPipeVal));
		if ((i != sizeof(triggerPipeVal)) && (errno != EAGAIN)) {
#endif
			Tcl_Panic("Tcl_WaitForEvent: "
				"read from %p->triggerEventFd: %s",
				(void *)tsdPtr, strerror(errno));
		} else {
		    continue;
		}
	    }
	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
	return 0;
    }
}
 
#endif /* !HAVE_COREFOUNDATION */

#endif /* NOTIFIER_EPOLL */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Added unix/tclKqueueNotfy.c.




















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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
/*
 * tclKqueueNotfy.c --
 *
 *	This file contains the implementation of the kqueue()-based
 *	DragonFly/Free/Net/OpenBSD-specific notifier, which is the lowest-
 *	level part of the Tcl event loop. This file works together with
 *	generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio Andrés Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#ifdef NOTIFIER_KQUEUE

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/queue.h>
#include <sys/time.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

struct PlatformEventData;
typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
    LIST_ENTRY(FileHandler) readyNode;
				/* Next/previous in list of FileHandlers asso-
				 * ciated with regular files (S_IFREG) that are
				 * ready for I/O. */
    struct PlatformEventData *pedPtr;
				/* Pointer to PlatformEventData associating this
				 * FileHandler with kevent(2) events. */
} FileHandler;

/*
 * The following structure associates a FileHandler and the thread that owns it
 * with the file descriptors of interest and their event masks passed to kevent(2)
 * and their corresponding event(s) returned by kevent(2).
 */

struct ThreadSpecificData;
struct PlatformEventData {
    FileHandler *filePtr;
    struct ThreadSpecificData *tsdPtr;
};

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * kqueue based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

LIST_HEAD(PlatformReadyFileHandlerList, FileHandler);
typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    struct PlatformReadyFileHandlerList firstReadyFileHandlerPtr;
				/* Pointer to head of list of FileHandlers
				 * associated with regular files (S_IFREG)
				 * that are ready for I/O. */
    pthread_mutex_t notifierMutex;
				/* Mutex protecting notifier termination in
				 * PlatformEventsFinalize. */
    int triggerPipe[2];		/* pipe(2) used by other threads to wake
				 * up this thread for inter-thread IPC. */
    int eventsFd;		/* kqueue(2) file descriptor used to wait for fds. */
    struct kevent *readyEvents;	/* Pointer to at most maxReadyEvents events
				 * returned by kevent(2). */
    size_t maxReadyEvents;	/* Count of kevents in readyEvents. */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;
 
void PlatformEventsControl(FileHandler *filePtr, ThreadSpecificData *tsdPtr, int op, int isNew);
static void PlatformEventsFinalize(void);
void PlatformEventsInit(void);
static int PlatformEventsTranslate(struct kevent *eventPtr);
static int PlatformEventsWait(struct kevent *events, size_t numEvents, struct timeval *timePtr);
 
#include "tclUnixNotfy.c"
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	If no initNotifierProc notifier hook exists, PlatformEventsInit
 *	is called.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	PlatformEventsInit();
	return tsdPtr;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If no finalizeNotifierProc notifier hook exists, PlatformEvents-
 *	Finalize is called.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
	PlatformEventsFinalize();
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsControl --
 *
 *	This function registers interest for the file descriptor and the mask
 *	of TCL_* bits associated with filePtr on the kqueue file descriptor
 *	associated with tsdPtr.
 *	Future calls to kevent will return filePtr and tsdPtr alongside with
 *	the event registered here via the PlatformEventData struct.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If adding a new file descriptor, a PlatformEventData struct will be
 *	allocated and associated with filePtr.
 *	fstat is called on the file descriptor; if it is associated with
 *	a regular file (S_IFREG,) filePtr is considered to be ready for I/O
 *	and added to or deleted from the corresponding list in tsdPtr.
 *	If it is not associated with a regular file, the file descriptor is
 *	added, modified concerning its mask of events of interest, or deleted
 *	from the epoll file descriptor of the calling thread.
 *	If deleting a file descriptor, kevent(2) is called twice specifying
 *	EVFILT_READ first and then EVFILT_WRITE (see note below.)
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsControl(
	FileHandler *filePtr,
	ThreadSpecificData *tsdPtr,
	int op,
	int isNew)
{
    int numChanges;
    struct kevent changeList[2];
    struct PlatformEventData *newPedPtr;
    struct stat fdStat;

    if (isNew) {
        newPedPtr = ckalloc(sizeof(*newPedPtr));
        newPedPtr->filePtr = filePtr;
        newPedPtr->tsdPtr = tsdPtr;
        filePtr->pedPtr = newPedPtr;
    }

    /*
     * N.B.	As discussed in Tcl_WaitForEvent(), kqueue(2) does not repro-
     *		duce the `always ready' {select,poll}(2) behaviour for regular
     *		files (S_IFREG) prior to FreeBSD 11.0-RELEASE. Therefore, file-
     *		Ptr is in these cases simply added or deleted from the list of
     *		FileHandlers associated with regular files belonging to tsdPtr.
     */

    if (fstat(filePtr->fd, &fdStat) == -1) {
	Tcl_Panic("fstat: %s", strerror(errno));
    } else if ((fdStat.st_mode & S_IFMT) == S_IFREG) {
	switch (op) {
	case EV_ADD:
	    if (isNew) {
		LIST_INSERT_HEAD(&tsdPtr->firstReadyFileHandlerPtr, filePtr, readyNode);
	    }
	    break;
	case EV_DELETE:
	    LIST_REMOVE(filePtr, readyNode);
	    break;
	}
	return;
    }

    numChanges = 0;
    switch (op) {
    case EV_ADD:
	if (filePtr->mask & (TCL_READABLE | TCL_EXCEPTION)) {
	    EV_SET(&changeList[numChanges], (uintptr_t)filePtr->fd, EVFILT_READ,
		op, 0, 0, filePtr->pedPtr);
	    numChanges++;
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    EV_SET(&changeList[numChanges], (uintptr_t)filePtr->fd, EVFILT_WRITE,
		op, 0, 0, filePtr->pedPtr);
	    numChanges++;
	}
        if (numChanges) {
	    if (kevent(tsdPtr->eventsFd, changeList, numChanges, NULL, 0, NULL) == -1) {
		Tcl_Panic("kevent: %s", strerror(errno));
	    }
	}
	break;
    case EV_DELETE:
	/*
	 * N.B.	kqueue(2) has separate filters for readability and writabi-
	 *		lity fd events. We therefore need to ensure that fds are
	 *		ompletely removed from the kqueue(2) fd when deleting.
	 *		This is exacerbated by changes to filePtr->mask w/o calls
	 *		to PlatforEventsControl() after e.g. an exec(3) in a child
	 *		process.
	 *		As one of these calls can fail, two separate kevent(2) calls
	 *		are made for EVFILT_{READ,WRITE}.
	 */
	EV_SET(&changeList[0], (uintptr_t)filePtr->fd, EVFILT_READ, op, 0, 0, NULL);
	if ((kevent(tsdPtr->eventsFd, changeList, 1, NULL, 0, NULL) == -1)
		&& (errno != ENOENT)) {
	    Tcl_Panic("kevent: %s", strerror(errno));
	}
	EV_SET(&changeList[0], (uintptr_t)filePtr->fd, EVFILT_WRITE, op, 0, 0, NULL);
	if ((kevent(tsdPtr->eventsFd, changeList, 1, NULL, 0, NULL) == -1)
		&& (errno != ENOENT)) {
	    Tcl_Panic("kevent: %s", strerror(errno));
	}
	break;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsFinalize --
 *
 *	This function closes the pipe and the kqueue file descriptors
 *	and frees the kevent structs owned by the thread of the caller.
 *	The above operations are protected by tsdPtr->notifierMutex, which
 *	is destroyed thereafter.
 *
 * Results:
 *	None.
 *
 * Side effects:
 * 	While tsdPtr->notifierMutex is held:
 *	The per-thread pipe(2) fds are closed, if non-zero, and set to -1.
 *	The per-thread kqueue(2) fd is closed, if non-zero, and set to 0.
 *	The per-thread kevent structs are freed, if any, and set to 0.
 *
 *	tsdPtr->notifierMutex is destroyed.
 *
 *----------------------------------------------------------------------
 */

void
PlatformEventsFinalize(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    pthread_mutex_lock(&tsdPtr->notifierMutex);
    if (tsdPtr->triggerPipe[0]) {
	close(tsdPtr->triggerPipe[0]);
	tsdPtr->triggerPipe[0] = -1;
    }
    if (tsdPtr->triggerPipe[1]) {
	close(tsdPtr->triggerPipe[1]);
	tsdPtr->triggerPipe[1] = -1;
    }
    if (tsdPtr->eventsFd > 0) {
	close(tsdPtr->eventsFd);
	tsdPtr->eventsFd = 0;
    }
    if (tsdPtr->readyEvents) {
	ckfree(tsdPtr->readyEvents);
	tsdPtr->maxReadyEvents = 0;
    }
    pthread_mutex_unlock(&tsdPtr->notifierMutex);
    if ((errno = pthread_mutex_destroy(&tsdPtr->notifierMutex))) {
	Tcl_Panic("pthread_mutex_destroy: %s", strerror(errno));
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsInit --
 *
 *	This function abstracts creating a kqueue fd via the kqueue
 *	system call and allocating memory for the kevents structs in
 *	tsdPtr for the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The following per-thread entities are initialised:
 *	notifierMutex is initialised.
 *	The pipe(2) is created; fcntl(2) is called on both fds to set
 *	FD_CLOEXEC and O_NONBLOCK.
 *	The kqueue(2) fd is created; fcntl(2) is called on it to set
 *	FD_CLOEXEC.
 *	A FileHandler struct is allocated and initialised for the event-
 *	fd(2), registering interest for TCL_READABLE on it via Platform-
 *	EventsControl().
 *	readyEvents and maxReadyEvents are initialised with 512 kevents.

 *----------------------------------------------------------------------
 */

void
PlatformEventsInit(
	void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    int i, fdFl;
    FileHandler *filePtr;

    errno = pthread_mutex_init(&tsdPtr->notifierMutex, NULL);
    if (errno) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create mutex");
    }
    if (pipe(tsdPtr->triggerPipe) != 0) {
	Tcl_Panic("Tcl_InitNotifier: %s", "could not create trigger pipe");
    } else for (i = 0; i < 2; i++) {
	if (fcntl(tsdPtr->triggerPipe[i], F_SETFD, FD_CLOEXEC) == -1) {
	    Tcl_Panic("fcntl: %s", strerror(errno));
	} else {
	    fdFl = fcntl(tsdPtr->triggerPipe[i], F_GETFL);
	    fdFl |= O_NONBLOCK;
	}
	if (fcntl(tsdPtr->triggerPipe[i], F_SETFL, fdFl) == -1) {
	    Tcl_Panic("fcntl: %s", strerror(errno));
	}
    }
    if ((tsdPtr->eventsFd = kqueue()) == -1) {
	Tcl_Panic("kqueue: %s", strerror(errno));
    } else if (fcntl(tsdPtr->eventsFd, F_SETFD, FD_CLOEXEC) == -1) {
	Tcl_Panic("fcntl: %s", strerror(errno));
    }
    filePtr = ckalloc(sizeof(*filePtr));
    filePtr->fd = tsdPtr->triggerPipe[0];
    filePtr->mask = TCL_READABLE;
    PlatformEventsControl(filePtr, tsdPtr, EV_ADD, 1);
    if (!tsdPtr->readyEvents) {
        tsdPtr->maxReadyEvents = 512;
	tsdPtr->readyEvents = ckalloc(tsdPtr->maxReadyEvents
	    * sizeof(tsdPtr->readyEvents[0]));
    }
    LIST_INIT(&tsdPtr->firstReadyFileHandlerPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsTranslate --
 *
 *	This function translates the platform-specific mask of returned
 *	events in eventPtr to a mask of TCL_* bits.
 *
 * Results:
 *	Returns the translated mask.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsTranslate(
	struct kevent *eventPtr)
{
    int mask;

    mask = 0;
    if (eventPtr->filter == EVFILT_READ) {
	mask |= TCL_READABLE;
	if (eventPtr->flags & EV_ERROR) {
	    mask |= TCL_EXCEPTION;
	}
    }
    if (eventPtr->filter == EVFILT_WRITE) {
	mask |= TCL_WRITABLE;
	if (eventPtr->flags & EV_ERROR) {
	    mask |= TCL_EXCEPTION;
	}
    }
    return mask;
}

/*
 *----------------------------------------------------------------------
 *
 * PlatformEventsWait --
 *
 *	This function abstracts waiting for I/O events via the kevent
 *	system call.
 *
 * Results:
 *	Returns -1 if kevent failed. Returns 0 if polling and if no events
 *	became available whilst polling. Returns a pointer to and the count
 *	of all returned events in all other cases.
 *
 * Side effects:
 *	gettimeofday(2), kevent(2), and gettimeofday(2) are called,
 *	in the specified order.
 *	If timePtr specifies a positive value, it is updated to reflect
 *	the amount of time that has passed; if its value would {under,
 *	over}flow, it is set to zero.
 *
 *----------------------------------------------------------------------
 */

int
PlatformEventsWait(
    struct kevent *events,
    size_t numEvents,
    struct timeval *timePtr)
{
    int numFound;
    struct timeval tv0, tv1, tv_delta;
    struct timespec timeout, *timeoutPtr;

    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * If timePtr is NULL, kevent(2) will wait indefinitely. If it speci-
     * fies a timeout of {0,0}, kevent(2) will poll. Otherwise, the time-
     * out will simply be converted to a timespec.
     */

    if (!timePtr) {
	timeoutPtr = NULL;
    } else if (!timePtr->tv_sec && !timePtr->tv_usec) {
	timeout.tv_sec = 0;
	timeout.tv_nsec = 0;
	timeoutPtr = &timeout;
    } else {
	timeout.tv_sec = timePtr->tv_sec;
	timeout.tv_nsec = timePtr->tv_usec * 1000;
	timeoutPtr = &timeout;
    }

    /*
     * Call (and possibly block on) kevent(2) and substract the delta of
     * gettimeofday(2) before and after the call from timePtr if the latter
     * is not NULL. Return the number of events returned by kevent(2).
     */

    gettimeofday(&tv0, NULL);
    numFound = kevent(tsdPtr->eventsFd, NULL, 0, events, (int)numEvents, timeoutPtr);
    gettimeofday(&tv1, NULL);
    if (timePtr && (timePtr->tv_sec && timePtr->tv_usec)) {
	timersub(&tv1, &tv0, &tv_delta);
	if (!timercmp(&tv_delta, timePtr, >)) {
		timersub(timePtr, &tv_delta, timePtr);
	} else {
		timePtr->tv_sec = 0;
		timePtr->tv_usec = 0;
	}
    }
    return numFound;
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the kqueue notifier
 *	of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *	PlatformEventsControl() is called for the new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    int isNew;

    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	    isNew = 1;
	} else {
	    isNew = 0;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	PlatformEventsControl(filePtr, tsdPtr, EV_ADD, isNew);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file on
 *	the kqueue of the thread of the caller.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *	PlatformEventsControl() is called for the file handler structure.
 *	The PlatformEventData struct associated with the new file handler
 *	structure is freed.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	PlatformEventsControl(filePtr, tsdPtr, EV_DELETE, 0);
	if (filePtr->pedPtr) {
	    ckfree(filePtr->pedPtr);
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *	The waiting logic is implemented in PlatformEventsWait.
 *
 * Results:
 *	Returns -1 if PlatformEventsWait() would block forever, otherwise
 *	returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by PlatformEventsWait().
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular epoll_wait()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound, numEvent;
	struct PlatformEventData *pedPtr;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	int numQueued;
	ssize_t i;
	char buf[1];

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else {
	    timeoutPtr = NULL;
	}

	/*
	 * Walk the list of FileHandlers associated with regular files
	 * (S_IFREG) belonging to tsdPtr, queue Tcl events for them, and
	 * update their mask of events of interest.
	 * kqueue(2), unlike epoll(7), does support regular files, but
	 * EVFILT_READ only `[r]eturns when the file pointer is not at
	 * the end of file' as opposed to unconditionally. While FreeBSD
	 * 11.0-RELEASE adds support for this mode (NOTE_FILE_POLL,) this
	 * is not used for reasons of compatibility.
	 * Therefore, the behaviour of {select,poll}(2) is simply simulated
	 * here: fds associated with regular files are added to this list by
	 * PlatformEventsControl() and processed here before calling (and
	 * possibly blocking) on PlatformEventsWait().
	 */

	numQueued = 0;
	LIST_FOREACH(filePtr, &tsdPtr->firstReadyFileHandlerPtr, readyNode) {
	    mask = 0;
	    if (filePtr->mask & TCL_READABLE) {
		mask |= TCL_READABLE;
	    }
	    if (filePtr->mask & TCL_WRITABLE) {
		mask |= TCL_WRITABLE;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
		    ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
		numQueued++;
	    }
	    filePtr->readyMask = mask;
	}

	/*
	 * If any events were queued in the above loop, force PlatformEvents-
	 * Wait() to poll as there already are events that need to be processed
	 * at this point.
	 */

	if (numQueued) {
	    timeout.tv_sec = 0;
	    timeout.tv_usec = 0;
	    timeoutPtr = &timeout;
	}

	/*
	 * Wait or poll for new events, queue Tcl events for the FileHandlers
	 * corresponding to them, and update the FileHandlers' mask of events
	 * of interest registered by the last call to Tcl_CreateFileHandler().
	 *
	 * Events for the trigger pipe are processed here in order to facilitate
	 * inter-thread IPC. If another thread intends to wake up this thread
	 * whilst it's blocking on PlatformEventsWait(), it write(2)s to the
	 * other end of the pipe (see Tcl_AlertNotifier(),) which in turn will
	 * cause PlatformEventsWait() to return immediately.
	 */

	numFound = PlatformEventsWait(tsdPtr->readyEvents, tsdPtr->maxReadyEvents, timeoutPtr);
	for (numEvent = 0; numEvent < numFound; numEvent++) {
	    pedPtr = (struct PlatformEventData *)tsdPtr->readyEvents[numEvent].udata;
	    filePtr = pedPtr->filePtr;
	    mask = PlatformEventsTranslate(&tsdPtr->readyEvents[numEvent]);
	    if (filePtr->fd == tsdPtr->triggerPipe[0]) {
		do {
		    i = read(tsdPtr->triggerPipe[0], buf, 1);
		    if ((i == -1) && (errno != EAGAIN)) {
			Tcl_Panic("Tcl_WaitForEvent: "
				"read from %p->triggerPipe: %s",
				(void *)tsdPtr, strerror(errno));
		    } else {
			break;
		    }
		} while (1);
		continue;
	    }
	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask |= mask;
	}
	return 0;
    }
}
 
#endif /* !HAVE_COREFOUNDATION */

#endif /* NOTIFIER_KQUEUE */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Added unix/tclSelectNotfy.c.


























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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
/*
 * tclSelectNotfy.c --
 *
 *	This file contains the implementation of the select()-based
 *	generic Unix notifier, which is the lowest-level part of the
 *	Tcl event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#if !defined(NOTIFIER_EPOLL) && !defined(NOTIFIER_KQUEUE)

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
} FileHandler;

/*
 * The following structure contains a set of select() masks to track readable,
 * writable, and exception conditions.
 */

typedef struct {
    fd_set readable;
    fd_set writable;
    fd_set exception;
} SelectMasks;

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following static structure contains the state information for the
 * select based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    SelectMasks checkMasks;	/* This structure is used to build up the
				 * masks to be used in the next call to
				 * select. Bits are set in response to calls
				 * to Tcl_CreateFileHandler. */
    SelectMasks readyMasks;	/* This array reflects the readable/writable
				 * conditions that were found to exist by the
				 * last call to select. */
    int numFdBits;		/* Number of valid bits in checkMasks (one
				 * more than highest fd for which
				 * Tcl_WatchFile has been called). */
#ifdef TCL_THREADS
    int onList;			/* True if it is in this list */
    unsigned int pollState;	/* pollState is used to implement a polling
				 * handshake between each thread and the
				 * notifier thread. Bits defined below. */
    struct ThreadSpecificData *nextPtr, *prevPtr;
				/* All threads that are currently waiting on
				 * an event have their ThreadSpecificData
				 * structure on a doubly-linked listed formed
				 * from these pointers. You must hold the
				 * notifierMutex lock before accessing these
				 * fields. */
#ifdef __CYGWIN__
    void *event;     /* Any other thread alerts a notifier
	 * that an event is ready to be processed
	 * by sending this event. */
    void *hwnd;			/* Messaging window. */
#else /* !__CYGWIN__ */
    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
#endif /* __CYGWIN__ */
    int waitCVinitialized;	/* Variable to flag initialization of the structure */
    int eventReady;		/* True if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif /* TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

#ifdef TCL_THREADS
/*
 * The following static indicates the number of threads that have initialized
 * notifiers.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */

static int notifierCount = 0;

/*
 * The following variable points to the head of a doubly-linked list of
 * ThreadSpecificData structures for all threads that are currently waiting on
 * an event.
 *
 * You must hold the notifierMutex lock before accessing this list.
 */

static ThreadSpecificData *waitingListPtr = NULL;

/*
 * The notifier thread spends all its time in select() waiting for a file
 * descriptor associated with one of the threads on the waitingListPtr list to
 * do something interesting. But if the contents of the waitingListPtr list
 * ever changes, we need to wake up and restart the select() system call. You
 * can wake up the notifier thread by writing a single byte to the file
 * descriptor defined below. This file descriptor is the input-end of a pipe
 * and the notifier thread is listening for data on the output-end of the same
 * pipe. Hence writing to this file descriptor will cause the select() system
 * call to return and wake up the notifier thread.
 *
 * You must hold the notifierMutex lock before writing to the pipe.
 */

static int triggerPipe = -1;

/*
 * The notifierMutex locks access to all of the global notifier state.
 */

static pthread_mutex_t notifierInitMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t notifierMutex     = PTHREAD_MUTEX_INITIALIZER;
/*
 * The following static indicates if the notifier thread is running.
 *
 * You must hold the notifierInitMutex before accessing this variable.
 */

static int notifierThreadRunning = 0;

/*
 * The notifier thread signals the notifierCV when it has finished
 * initializing the triggerPipe and right before the notifier thread
 * terminates.
 */

static pthread_cond_t notifierCV = PTHREAD_COND_INITIALIZER;

/*
 * The pollState bits
 *	POLL_WANT is set by each thread before it waits on its condition
 *		variable. It is checked by the notifier before it does select.
 *	POLL_DONE is set by the notifier if it goes into select after seeing
 *		POLL_WANT. The idea is to ensure it tries a select with the
 *		same bits the initial thread had set.
 */

#define POLL_WANT	0x1
#define POLL_DONE	0x2

/*
 * This is the thread ID of the notifier thread that does select.
 */

static Tcl_ThreadId notifierThread;
#endif /* TCL_THREADS */

/*
 * Static routines defined in this file.
 */

#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)
static int	atForkInit = 0;
static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */
static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);
 
/*
 * Import of Windows API when building threaded with Cygwin.
 */

#if defined(TCL_THREADS) && defined(__CYGWIN__)
typedef struct {
    void *hwnd;
    unsigned int *message;
    int wParam;
    int lParam;
    int time;
    int x;
    int y;
} MSG;

typedef struct {
    unsigned int style;
    void *lpfnWndProc;
    int cbClsExtra;
    int cbWndExtra;
    void *hInstance;
    void *hIcon;
    void *hCursor;
    void *hbrBackground;
    void *lpszMenuName;
    const void *lpszClassName;
} WNDCLASS;

extern void __stdcall	CloseHandle(void *);
extern void *__stdcall	CreateEventW(void *, unsigned char, unsigned char,
			    void *);
extern void * __stdcall	CreateWindowExW(void *, const void *, const void *,
			    DWORD, int, int, int, int, void *, void *, void *, void *);
extern DWORD __stdcall	DefWindowProcW(void *, int, void *, void *);
extern unsigned char __stdcall	DestroyWindow(void *);
extern int __stdcall	DispatchMessageW(const MSG *);
extern unsigned char __stdcall	GetMessageW(MSG *, void *, int, int);
extern void __stdcall	MsgWaitForMultipleObjects(DWORD, void *,
			    unsigned char, DWORD, DWORD);
extern unsigned char __stdcall	PeekMessageW(MSG *, void *, int, int, int);
extern unsigned char __stdcall	PostMessageW(void *, unsigned int, void *,
				    void *);
extern void __stdcall	PostQuitMessage(int);
extern void *__stdcall	RegisterClassW(const WNDCLASS *);
extern unsigned char __stdcall	ResetEvent(void *);
extern unsigned char __stdcall	TranslateMessage(const MSG *);

/*
 * Threaded-cygwin specific constants and functions in this file:
 */

static const WCHAR className[] = L"TclNotifier";
static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
			    void *wParam, void *lParam);
#endif /* TCL_THREADS && __CYGWIN__ */

 
#include "tclUnixNotfy.c"
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

#ifdef TCL_THREADS
	tsdPtr->eventReady = 0;

	/*
	 * Initialize thread specific condition variable for this thread.
	 */
	if (tsdPtr->waitCVinitialized == 0) {
#ifdef __CYGWIN__
	    WNDCLASS class;

	    class.style = 0;
	    class.cbClsExtra = 0;
	    class.cbWndExtra = 0;
	    class.hInstance = TclWinGetTclInstance();
	    class.hbrBackground = NULL;
	    class.lpszMenuName = NULL;
	    class.lpszClassName = className;
	    class.lpfnWndProc = NotifierProc;
	    class.hIcon = NULL;
	    class.hCursor = NULL;

	    RegisterClassW(&class);
	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
		    0 /* !signaled */, NULL);
#else
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif /* __CYGWIN__ */
	    tsdPtr->waitCVinitialized = 1;
	}

	pthread_mutex_lock(&notifierInitMutex);
#if defined(HAVE_PTHREAD_ATFORK)
	/*
	 * Install pthread_atfork handlers to clean up the notifier in the
	 * child of a fork.
	 */

	if (!atForkInit) {
	    int result = pthread_atfork(NULL, NULL, AtForkChild);

	    if (result) {
		Tcl_Panic("Tcl_InitNotifier: pthread_atfork failed");
	    }
	    atForkInit = 1;
	}
#endif /* HAVE_PTHREAD_ATFORK */

	notifierCount++;

	pthread_mutex_unlock(&notifierInitMutex);

#endif /* TCL_THREADS */
	return tsdPtr;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May terminate the background notifier thread if this is the last
 *	notifier instance.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	pthread_mutex_lock(&notifierInitMutex);
	notifierCount--;

	/*
	 * If this is the last thread to use the notifier, close the notifier
	 * pipe and wait for the background thread to terminate.
	 */

	if (notifierCount == 0) {

	    if (triggerPipe != -1) {
		if (write(triggerPipe, "q", 1) != 1) {
		    Tcl_Panic("Tcl_FinalizeNotifier: %s",
			    "unable to write q to triggerPipe");
		}
		close(triggerPipe);
		pthread_mutex_lock(&notifierMutex);
		while(triggerPipe != -1) {
		    pthread_cond_wait(&notifierCV, &notifierMutex);
		}
		pthread_mutex_unlock(&notifierMutex);
		if (notifierThreadRunning) {
		    int result = pthread_join((pthread_t) notifierThread, NULL);

		    if (result) {
			Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier "
				"thread");
		    }
		    notifierThreadRunning = 0;
		}
	    }
	}

	/*
	 * Clean up any synchronization objects in the thread local storage.
	 */

#ifdef __CYGWIN__
	DestroyWindow(tsdPtr->hwnd);
	CloseHandle(tsdPtr->event);
#else /* __CYGWIN__ */
	pthread_cond_destroy(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	tsdPtr->waitCVinitialized = 0;

	pthread_mutex_unlock(&notifierInitMutex);
#endif /* TCL_THREADS */
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the select notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	/*
	 * Update the check masks for this file.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.readable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.writable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &tsdPtr->checkMasks.exception);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}
	if (tsdPtr->numFdBits <= fd) {
	    tsdPtr->numFdBits = fd+1;
	}
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	int i;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	if (filePtr->mask & TCL_READABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (filePtr->mask & TCL_EXCEPTION) {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}

	/*
	 * Find current max fd.
	 */

	if (fd+1 == tsdPtr->numFdBits) {
	    int numFdBits = 0;

	    for (i = fd-1; i >= 0; i--) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.writable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    numFdBits = i+1;
		    break;
		}
	    }
	    tsdPtr->numFdBits = numFdBits;
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);
    }
}
 
#if defined(TCL_THREADS) && defined(__CYGWIN__)

static DWORD __stdcall
NotifierProc(
    void *hwnd,
    unsigned int message,
    void *wParam,
    void *lParam)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (message != 1024) {
	return DefWindowProcW(hwnd, message, wParam, lParam);
    }

    /*
     * Process all of the runnable events.
     */

    tsdPtr->eventReady = 1;
    Tcl_ServiceAll();
    return 0;
}
#endif /* TCL_THREADS && __CYGWIN__ */
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --
 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.
 *
 * Results:
 *	Returns -1 if the select would block forever, otherwise returns 0.
 *
 * Side effects:
 *	Queues file events that are detected by the select.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
#ifdef TCL_THREADS
	int waitForFiles;
#   ifdef __CYGWIN__
	MSG msg;
#   endif /* __CYGWIN__ */
#else
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular select()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound;
#endif /* TCL_THREADS */
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
#ifndef TCL_THREADS
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else if (tsdPtr->numFdBits == 0) {
	    /*
	     * If there are no threads, no timeout, and no fds registered,
	     * then there are no events possible and we must avoid deadlock.
	     * Note that this is not entirely correct because there might be a
	     * signal that could interrupt the select call, but we don't
	     * handle that case if we aren't using threads.
	     */

	    return -1;
	} else {
	    timeoutPtr = NULL;
#endif /* !TCL_THREADS */
	}

#ifdef TCL_THREADS
	/*
	 * Start notifier thread and place this thread on the list of
	 * interested threads, signal the notifier thread, and wait for a
	 * response or a timeout.
	 */
	StartNotifierThread("Tcl_WaitForEvent");

	pthread_mutex_lock(&notifierMutex);

	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
#if defined(__APPLE__) && defined(__LP64__)
		/*
		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have
		 * a bug that causes it to wait forever when passed an
		 * absolute time which has already been exceeded by the system
		 * time; as a workaround, when given a very brief timeout,
		 * just do a poll. [Bug 1457797]
		 */
		|| timePtr->usec < 10
#endif /* __APPLE__ && __LP64__ */
		)) {
	    /*
	     * Cannot emulate a polling select with a polling condition
	     * variable. Instead, pretend to wait for files and tell the
	     * notifier thread what we are doing. The notifier thread makes
	     * sure it goes through select with its select mask in the same
	     * state as ours currently is. We block until that happens.
	     */

	    waitForFiles = 1;
	    tsdPtr->pollState = POLL_WANT;
	    timePtr = NULL;
	} else {
	    waitForFiles = (tsdPtr->numFdBits > 0);
	    tsdPtr->pollState = 0;
	}

	if (waitForFiles) {
	    /*
	     * Add the ThreadSpecificData structure of this thread to the list
	     * of ThreadSpecificData structures of all threads that are
	     * waiting on file events.
	     */

	    tsdPtr->nextPtr = waitingListPtr;
	    if (waitingListPtr) {
		waitingListPtr->prevPtr = tsdPtr;
	    }
	    tsdPtr->prevPtr = 0;
	    waitingListPtr = tsdPtr;
	    tsdPtr->onList = 1;

	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

	FD_ZERO(&tsdPtr->readyMasks.readable);
	FD_ZERO(&tsdPtr->readyMasks.writable);
	FD_ZERO(&tsdPtr->readyMasks.exception);

	if (!tsdPtr->eventReady) {
#ifdef __CYGWIN__
	    if (!PeekMessageW(&msg, NULL, 0, 0, 0)) {
		DWORD timeout;

		if (timePtr) {
		    timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
		} else {
		    timeout = 0xFFFFFFFF;
		}
		pthread_mutex_unlock(&notifierMutex);
		MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279);
		pthread_mutex_lock(&notifierMutex);
	    }
#else
	    if (timePtr != NULL) {
	       Tcl_Time now;
	       struct timespec ptime;

	       Tcl_GetTime(&now);
	       ptime.tv_sec = timePtr->sec + now.sec + (timePtr->usec + now.usec) / 1000000;
	       ptime.tv_nsec = 1000 * ((timePtr->usec + now.usec) % 1000000);

	       pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex, &ptime);
	    } else {
	       pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
	    }
#endif /* __CYGWIN__ */
	}
	tsdPtr->eventReady = 0;

#ifdef __CYGWIN__
	while (PeekMessageW(&msg, NULL, 0, 0, 0)) {
	    /*
	     * Retrieve and dispatch the message.
	     */

	    DWORD result = GetMessageW(&msg, NULL, 0, 0);

	    if (result == 0) {
		PostQuitMessage(msg.wParam);
		/* What to do here? */
	    } else if (result != (DWORD) -1) {
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	    }
	}
	ResetEvent(tsdPtr->event);
#endif /* __CYGWIN__ */

	if (waitForFiles && tsdPtr->onList) {
	    /*
	     * Remove the ThreadSpecificData structure of this thread from the
	     * waiting list. Alert the notifier thread to recompute its select
	     * masks - skipping this caused a hang when trying to close a pipe
	     * which the notifier thread was still doing a select on.
	     */

	    if (tsdPtr->prevPtr) {
		tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
	    } else {
		waitingListPtr = tsdPtr->nextPtr;
	    }
	    if (tsdPtr->nextPtr) {
		tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
	    }
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	    tsdPtr->onList = 0;
	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

#else
	tsdPtr->readyMasks = tsdPtr->checkMasks;
	numFound = select(tsdPtr->numFdBits, &tsdPtr->readyMasks.readable,
		&tsdPtr->readyMasks.writable, &tsdPtr->readyMasks.exception,
		timeoutPtr);

	/*
	 * Some systems don't clear the masks after an error, so we have to do
	 * it here.
	 */

	if (numFound == -1) {
	    FD_ZERO(&tsdPtr->readyMasks.readable);
	    FD_ZERO(&tsdPtr->readyMasks.writable);
	    FD_ZERO(&tsdPtr->readyMasks.exception);
	}
#endif /* TCL_THREADS */

	/*
	 * Queue all detected file events before returning.
	 */

	for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL);
		filePtr = filePtr->nextPtr) {
	    mask = 0;
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.readable)) {
		mask |= TCL_READABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.writable)) {
		mask |= TCL_WRITABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.exception)) {
		mask |= TCL_EXCEPTION;
	    }

	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
#ifdef TCL_THREADS
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
	return 0;
    }
}
 
#ifdef TCL_THREADS
 
/*
 *----------------------------------------------------------------------
 *
 * NotifierThreadProc --
 *
 *	This routine is the initial (and only) function executed by the
 *	special notifier thread. Its job is to wait for file descriptors to
 *	become readable or writable or to have an exception condition and then
 *	to notify other threads who are interested in this information by
 *	signalling a condition variable. Other threads can signal this
 *	notifier thread of a change in their interests by writing a single
 *	byte to a special pipe that the notifier thread is monitoring.
 *
 * Result:
 *	None. Once started, this routine never exits. It dies with the overall
 *	process.
 *
 * Side effects:
 *	The trigger pipe used to signal the notifier thread is created when
 *	the notifier thread first starts.
 *
 *----------------------------------------------------------------------
 */

static TCL_NORETURN void
NotifierThreadProc(
    ClientData clientData)	/* Not used. */
{
    ThreadSpecificData *tsdPtr;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;
    int i;
    int fds[2], receivePipe;
    long found;
    struct timeval poll = {0., 0.}, *timePtr;
    char buf[2];
    int numFdBits = 0;

    if (pipe(fds) != 0) {
	Tcl_Panic("NotifierThreadProc: %s", "could not create trigger pipe");
    }

    receivePipe = fds[0];

    if (TclUnixSetBlockingMode(receivePipe, TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe non blocking");
    }
    if (TclUnixSetBlockingMode(fds[1], TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe non blocking");
    }
    if (fcntl(receivePipe, F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe close-on-exec");
    }
    if (fcntl(fds[1], F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe close-on-exec");
    }

    /*
     * Install the write end of the pipe into the global variable.
     */

    pthread_mutex_lock(&notifierMutex);
    triggerPipe = fds[1];

    /*
     * Signal any threads that are waiting.
     */

    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    /*
     * Look for file events and report them to interested threads.
     */

    while (1) {
	FD_ZERO(&readableMask);
	FD_ZERO(&writableMask);
	FD_ZERO(&exceptionMask);

	/*
	 * Compute the logical OR of the masks from all the waiting
	 * notifiers.
	 */

	pthread_mutex_lock(&notifierMutex);
	timePtr = NULL;
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)) {
		    FD_SET(i, &readableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)) {
		    FD_SET(i, &writableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    FD_SET(i, &exceptionMask);
		}
	    }
	    if (tsdPtr->numFdBits > numFdBits) {
		numFdBits = tsdPtr->numFdBits;
	    }
	    if (tsdPtr->pollState & POLL_WANT) {
		/*
		 * Here we make sure we go through select() with the same mask
		 * bits that were present when the thread tried to poll.
		 */

		tsdPtr->pollState |= POLL_DONE;
		timePtr = &poll;
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Set up the mask to include the receive pipe.
	 */

	if (receivePipe >= numFdBits) {
	    numFdBits = receivePipe + 1;
	}
	FD_SET(receivePipe, &readableMask);

	if (select(numFdBits, &readableMask, &writableMask, &exceptionMask,
		timePtr) == -1) {
	    /*
	     * Try again immediately on an error.
	     */

	    continue;
	}

	/*
	 * Alert any threads that are waiting on a ready file descriptor.
	 */

	pthread_mutex_lock(&notifierMutex);
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    found = 0;

	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			&& FD_ISSET(i, &readableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.readable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)
			&& FD_ISSET(i, &writableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.writable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)
			&& FD_ISSET(i, &exceptionMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.exception);
		    found = 1;
		}
	    }

	    if (found || (tsdPtr->pollState & POLL_DONE)) {
		AlertSingleThread(tsdPtr);
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Consume the next byte from the notifier pipe if the pipe was
	 * readable. Note that there may be multiple bytes pending, but to
	 * avoid a race condition we only read one at a time.
	 */

	do {
	    i = read(receivePipe, buf, 1);
	    if (i <= 0) {
		break;
	    } else if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) {
		/*
		 * Someone closed the write end of the pipe or sent us a Quit
		 * message [Bug: 4139] and then closed the write end of the
		 * pipe so we need to shut down the notifier thread.
		 */

		break;
	    }
	} while (1);
	if ((i == 0) || (buf[0] == 'q')) {
	    break;
	}
    }

    /*
     * Clean up the read end of the pipe and signal any threads waiting on
     * termination of the notifier thread.
     */

    close(receivePipe);
    pthread_mutex_lock(&notifierMutex);
    triggerPipe = -1;
    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    TclpThreadExit(0);
}
 
#endif /* TCL_THREADS */

#endif /* !HAVE_COREFOUNDATION */

#endif /* !NOTIFIER_EPOLL && !NOTIFIER_KQUEUE */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

Changes to unix/tclUnixChan.c.

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
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "\"%s\" cannot be used to get a FILE *", chanID));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
	    NULL);
    return TCL_ERROR;
}
 
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
/*
 *----------------------------------------------------------------------
 *
 * TclUnixWaitForFile --
 *
 *	This function waits synchronously for a file to become readable or
 *	writable, with an optional timeout.
 *
 * Results:
 *	The return value is an OR'ed combination of TCL_READABLE,
 *	TCL_WRITABLE, and TCL_EXCEPTION, indicating the conditions that are
 *	present on file at the time of the return. This function will not
 *	return until either "timeout" milliseconds have elapsed or at least
 *	one of the conditions given by mask has occurred for file (a return
 *	value of 0 means that a timeout occurred). No normal events will be
 *	serviced during the execution of this function.
 *
 * Side effects:
 *	Time passes.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixWaitForFile(
    int fd,			/* Handle for file on which to wait. */
    int mask,			/* What to wait for: OR'ed combination of
				 * TCL_READABLE, TCL_WRITABLE, and
				 * TCL_EXCEPTION. */
    int timeout)		/* Maximum amount of time to wait for one of
				 * the conditions in mask to occur, in
				 * milliseconds. A value of 0 means don't wait
				 * at all, and a value of -1 means wait
				 * forever. */
{
    Tcl_Time abortTime = {0, 0}, now; /* silence gcc 4 warning */
    struct timeval blockTime, *timeoutPtr;
    int numFound, result = 0;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;

#ifndef _DARWIN_C_SOURCE
    /*
     * Sanity check fd.
     */

    if (fd >= FD_SETSIZE) {
	Tcl_Panic("TclUnixWaitForFile can't handle file id %d", fd);
	/* must never get here, or select masks overrun will occur below */
    }
#endif

    /*
     * If there is a non-zero finite timeout, compute the time when we give
     * up.
     */

    if (timeout > 0) {
	Tcl_GetTime(&now);
	abortTime.sec = now.sec + timeout/1000;
	abortTime.usec = now.usec + (timeout%1000)*1000;
	if (abortTime.usec >= 1000000) {
	    abortTime.usec -= 1000000;
	    abortTime.sec += 1;
	}
	timeoutPtr = &blockTime;
    } else if (timeout == 0) {
	timeoutPtr = &blockTime;
	blockTime.tv_sec = 0;
	blockTime.tv_usec = 0;
    } else {
	timeoutPtr = NULL;
    }

    /*
     * Initialize the select masks.
     */

    FD_ZERO(&readableMask);
    FD_ZERO(&writableMask);
    FD_ZERO(&exceptionMask);

    /*
     * Loop in a mini-event loop of our own, waiting for either the file to
     * become ready or a timeout to occur.
     */

    while (1) {
	if (timeout > 0) {
	    blockTime.tv_sec = abortTime.sec - now.sec;
	    blockTime.tv_usec = abortTime.usec - now.usec;
	    if (blockTime.tv_usec < 0) {
		blockTime.tv_sec -= 1;
		blockTime.tv_usec += 1000000;
	    }
	    if (blockTime.tv_sec < 0) {
		blockTime.tv_sec = 0;
		blockTime.tv_usec = 0;
	    }
	}

	/*
	 * Setup the select masks for the fd.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &readableMask);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &writableMask);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &exceptionMask);
	}

	/*
	 * Wait for the event or a timeout.
	 */

	numFound = select(fd + 1, &readableMask, &writableMask,
		&exceptionMask, timeoutPtr);
	if (numFound == 1) {
	    if (FD_ISSET(fd, &readableMask)) {
		SET_BITS(result, TCL_READABLE);
	    }
	    if (FD_ISSET(fd, &writableMask)) {
		SET_BITS(result, TCL_WRITABLE);
	    }
	    if (FD_ISSET(fd, &exceptionMask)) {
		SET_BITS(result, TCL_EXCEPTION);
	    }
	    result &= mask;
	    if (result) {
		break;
	    }
	}
	if (timeout == 0) {
	    break;
	}
	if (timeout < 0) {
	    continue;
	}

	/*
	 * The select returned early, so we need to recompute the timeout.
	 */

	Tcl_GetTime(&now);
	if ((abortTime.sec < now.sec)
		|| (abortTime.sec==now.sec && abortTime.usec<=now.usec)) {
	    break;
	}
    }
    return result;
}
#endif /* HAVE_COREFOUNDATION */
 
/*
 *----------------------------------------------------------------------
 *
 * FileTruncateProc --
 *
 *	Truncates a file to a given length.
 *






<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<







1721
1722
1723
1724
1725
1726
1727
































































































































































1728
1729
1730
1731
1732
1733
1734
    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
	    "\"%s\" cannot be used to get a FILE *", chanID));
    Tcl_SetErrorCode(interp, "TCL", "VALUE", "CHANNEL", "NO_DESCRIPTOR",
	    NULL);
    return TCL_ERROR;
}
 
































































































































































/*
 *----------------------------------------------------------------------
 *
 * FileTruncateProc --
 *
 *	Truncates a file to a given length.
 *

Changes to unix/tclUnixNotfy.c.

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
...
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
...
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
...
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
...
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
....
1403
1404
1405
1406
1407
1408
1409

1410
1411
1412
1413
1414
1415
1416
....
1422
1423
1424
1425
1426
1427
1428





















































































































































1429
1430
1431
1432
1433
1434
1435
1436
1437
/*
 * tclUnixNotfy.c --
 *
 *	This file contains the implementation of the select()-based
 *	Unix-specific notifier, which is the lowest-level part of the Tcl
 *	event loop. This file works together with generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.

 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
#include <signal.h>

/*
 * This structure is used to keep track of the notifier info for a registered
 * file.
 */

typedef struct FileHandler {
    int fd;
    int mask;			/* Mask of desired events: TCL_READABLE,
				 * etc. */
    int readyMask;		/* Mask of events that have been seen since
				 * the last time file handlers were invoked
				 * for this file. */
    Tcl_FileProc *proc;		/* Function to call, in the style of
				 * Tcl_CreateFileHandler. */
    ClientData clientData;	/* Argument to pass to proc. */
    struct FileHandler *nextPtr;/* Next in list of all files we care about. */
} FileHandler;

/*
 * The following structure is what is added to the Tcl event queue when file
 * handlers are ready to fire.
 */

typedef struct {
    Tcl_Event header;		/* Information that is standard for all
				 * events. */
    int fd;			/* File descriptor that is ready. Used to find
				 * the FileHandler structure for the file
				 * (can't point directly to the FileHandler
				 * structure because it could go away while
				 * the event is queued). */
} FileHandlerEvent;

/*
 * The following structure contains a set of select() masks to track readable,
 * writable, and exception conditions.
 */

typedef struct {
    fd_set readable;
    fd_set writable;
    fd_set exception;
} SelectMasks;

/*
 * The following static structure contains the state information for the
 * select based implementation of the Tcl notifier. One of these structures is
 * created for each thread that is using the notifier.
 */

typedef struct ThreadSpecificData {
    FileHandler *firstFileHandlerPtr;
				/* Pointer to head of file handler list. */
    SelectMasks checkMasks;	/* This structure is used to build up the
				 * masks to be used in the next call to
				 * select. Bits are set in response to calls
				 * to Tcl_CreateFileHandler. */
    SelectMasks readyMasks;	/* This array reflects the readable/writable
				 * conditions that were found to exist by the
				 * last call to select. */
    int numFdBits;		/* Number of valid bits in checkMasks (one
				 * more than highest fd for which
				 * Tcl_WatchFile has been called). */
#ifdef TCL_THREADS
    int onList;			/* True if it is in this list */
    unsigned int pollState;	/* pollState is used to implement a polling
				 * handshake between each thread and the
				 * notifier thread. Bits defined below. */
    struct ThreadSpecificData *nextPtr, *prevPtr;
				/* All threads that are currently waiting on
				 * an event have their ThreadSpecificData
				 * structure on a doubly-linked listed formed
				 * from these pointers. You must hold the
				 * notifierMutex lock before accessing these
				 * fields. */
#ifdef __CYGWIN__
    void *event;     /* Any other thread alerts a notifier
	 * that an event is ready to be processed
	 * by sending this event. */
    void *hwnd;			/* Messaging window. */
#else /* !__CYGWIN__ */
    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
#endif /* __CYGWIN__ */
    int waitCVinitialized;	/* Variable to flag initialization of the structure */
    int eventReady;		/* True if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif /* TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

#ifdef TCL_THREADS
/*
 * The following static indicates the number of threads that have initialized
 * notifiers.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */

static int notifierCount = 0;

/*
 * The following variable points to the head of a doubly-linked list of
 * ThreadSpecificData structures for all threads that are currently waiting on
 * an event.
 *
 * You must hold the notifierMutex lock before accessing this list.
 */

static ThreadSpecificData *waitingListPtr = NULL;

/*
 * The notifier thread spends all its time in select() waiting for a file
 * descriptor associated with one of the threads on the waitingListPtr list to
 * do something interesting. But if the contents of the waitingListPtr list
 * ever changes, we need to wake up and restart the select() system call. You
 * can wake up the notifier thread by writing a single byte to the file
 * descriptor defined below. This file descriptor is the input-end of a pipe
 * and the notifier thread is listening for data on the output-end of the same
 * pipe. Hence writing to this file descriptor will cause the select() system
 * call to return and wake up the notifier thread.
 *
 * You must hold the notifierMutex lock before writing to the pipe.
 */

static int triggerPipe = -1;

/*
 * The notifierMutex locks access to all of the global notifier state.
 */

static pthread_mutex_t notifierInitMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t notifierMutex     = PTHREAD_MUTEX_INITIALIZER;
/*
 * The following static indicates if the notifier thread is running.
 *
 * You must hold the notifierInitMutex before accessing this variable.
 */

static int notifierThreadRunning = 0;

/*
 * The notifier thread signals the notifierCV when it has finished
 * initializing the triggerPipe and right before the notifier thread
 * terminates.
 */

static pthread_cond_t notifierCV = PTHREAD_COND_INITIALIZER;

/*
 * The pollState bits
 *	POLL_WANT is set by each thread before it waits on its condition
 *		variable. It is checked by the notifier before it does select.
 *	POLL_DONE is set by the notifier if it goes into select after seeing
 *		POLL_WANT. The idea is to ensure it tries a select with the
 *		same bits the initial thread had set.
 */

#define POLL_WANT	0x1
#define POLL_DONE	0x2

/*
 * This is the thread ID of the notifier thread that does select.
 */

static Tcl_ThreadId notifierThread;

#endif /* TCL_THREADS */

/*
 * Static routines defined in this file.
 */


#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)
static int	atForkInit = 0;
static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */

static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);
 
/*
 * Import of Windows API when building threaded with Cygwin.
 */

#if defined(TCL_THREADS) && defined(__CYGWIN__)
typedef struct {
    void *hwnd;
    unsigned int *message;
    int wParam;
    int lParam;
    int time;
    int x;
    int y;
} MSG;

typedef struct {
    unsigned int style;
    void *lpfnWndProc;
    int cbClsExtra;
    int cbWndExtra;
    void *hInstance;
    void *hIcon;
    void *hCursor;
    void *hbrBackground;
    void *lpszMenuName;
    const void *lpszClassName;
} WNDCLASS;

extern void __stdcall	CloseHandle(void *);
extern void *__stdcall	CreateEventW(void *, unsigned char, unsigned char,
			    void *);
extern void * __stdcall	CreateWindowExW(void *, const void *, const void *,
			    DWORD, int, int, int, int, void *, void *, void *, void *);
extern DWORD __stdcall	DefWindowProcW(void *, int, void *, void *);
extern unsigned char __stdcall	DestroyWindow(void *);
extern int __stdcall	DispatchMessageW(const MSG *);
extern unsigned char __stdcall	GetMessageW(MSG *, void *, int, int);
extern void __stdcall	MsgWaitForMultipleObjects(DWORD, void *,
			    unsigned char, DWORD, DWORD);
extern unsigned char __stdcall	PeekMessageW(MSG *, void *, int, int, int);
extern unsigned char __stdcall	PostMessageW(void *, unsigned int, void *,
				    void *);
extern void __stdcall	PostQuitMessage(int);
extern void *__stdcall	RegisterClassW(const WNDCLASS *);
extern unsigned char __stdcall	ResetEvent(void *);
extern unsigned char __stdcall	TranslateMessage(const MSG *);

/*
 * Threaded-cygwin specific constants and functions in this file:
 */

static const WCHAR className[] = L"TclNotifier";
static DWORD __stdcall	NotifierProc(void *hwnd, unsigned int message,
			    void *wParam, void *lParam);
#endif /* TCL_THREADS && __CYGWIN__ */
 
#if TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * StartNotifierThread --
 *
 *	Start a notfier thread and wait for the notifier pipe to be created.
................................................................................

	    notifierThreadRunning = 1;
	}
	pthread_mutex_unlock(&notifierInitMutex);
    }
}
#endif /* TCL_THREADS */
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_InitNotifier --
 *
 *	Initializes the platform specific notifier state.
 *
 * Results:
 *	Returns a handle to the notifier state for this thread.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

ClientData
Tcl_InitNotifier(void)
{
    if (tclNotifierHooks.initNotifierProc) {
	return tclNotifierHooks.initNotifierProc();
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

#ifdef TCL_THREADS
	tsdPtr->eventReady = 0;

	/*
	 * Initialize thread specific condition variable for this thread.
	 */
	if (tsdPtr->waitCVinitialized == 0) {
#ifdef __CYGWIN__
	    WNDCLASS class;

	    class.style = 0;
	    class.cbClsExtra = 0;
	    class.cbWndExtra = 0;
	    class.hInstance = TclWinGetTclInstance();
	    class.hbrBackground = NULL;
	    class.lpszMenuName = NULL;
	    class.lpszClassName = className;
	    class.lpfnWndProc = NotifierProc;
	    class.hIcon = NULL;
	    class.hCursor = NULL;

	    RegisterClassW(&class);
	    tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
		    class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
		    0 /* !signaled */, NULL);
#else
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif /* __CYGWIN__ */
	    tsdPtr->waitCVinitialized = 1;
	}

	pthread_mutex_lock(&notifierInitMutex);
#if defined(HAVE_PTHREAD_ATFORK)
	/*
	 * Install pthread_atfork handlers to clean up the notifier in the
	 * child of a fork.
	 */

	if (!atForkInit) {
	    int result = pthread_atfork(NULL, NULL, AtForkChild);

	    if (result) {
		Tcl_Panic("Tcl_InitNotifier: pthread_atfork failed");
	    }
	    atForkInit = 1;
	}
#endif /* HAVE_PTHREAD_ATFORK */

	notifierCount++;

	pthread_mutex_unlock(&notifierInitMutex);

#endif /* TCL_THREADS */
	return tsdPtr;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --
 *
 *	This function is called to cleanup the notifier state before a thread
 *	is terminated.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May terminate the background notifier thread if this is the last
 *	notifier instance.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_FinalizeNotifier(
    ClientData clientData)		/* Not used. */
{
    if (tclNotifierHooks.finalizeNotifierProc) {
	tclNotifierHooks.finalizeNotifierProc(clientData);
	return;
    } else {
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	pthread_mutex_lock(&notifierInitMutex);
	notifierCount--;

	/*
	 * If this is the last thread to use the notifier, close the notifier
	 * pipe and wait for the background thread to terminate.
	 */

	if (notifierCount == 0) {

	    if (triggerPipe != -1) {
		if (write(triggerPipe, "q", 1) != 1) {
		    Tcl_Panic("Tcl_FinalizeNotifier: %s",
			    "unable to write q to triggerPipe");
		}
		close(triggerPipe);
		pthread_mutex_lock(&notifierMutex);
		while(triggerPipe != -1) {
		    pthread_cond_wait(&notifierCV, &notifierMutex);
		}
		pthread_mutex_unlock(&notifierMutex);
		if (notifierThreadRunning) {
		    int result = pthread_join((pthread_t) notifierThread, NULL);

		    if (result) {
			Tcl_Panic("Tcl_FinalizeNotifier: unable to join notifier "
				"thread");
		    }
		    notifierThreadRunning = 0;
		}
	    }
	}

	/*
	 * Clean up any synchronization objects in the thread local storage.
	 */

#ifdef __CYGWIN__
	DestroyWindow(tsdPtr->hwnd);
	CloseHandle(tsdPtr->event);
#else /* __CYGWIN__ */
	pthread_cond_destroy(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	tsdPtr->waitCVinitialized = 0;

	pthread_mutex_unlock(&notifierInitMutex);
#endif /* TCL_THREADS */
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_AlertNotifier --
 *
 *	Wake up the specified notifier from any thread. This routine is called
................................................................................
 *	routine is called. This routine is guaranteed not to be called on a
 *	given notifier after Tcl_FinalizeNotifier is called for that notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:

 *	Signals the notifier condition variable for the specified notifier.





 *
 *----------------------------------------------------------------------
 */

void
Tcl_AlertNotifier(
    ClientData clientData)
{
    if (tclNotifierHooks.alertNotifierProc) {
	tclNotifierHooks.alertNotifierProc(clientData);
	return;
    } else {

#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = clientData;

	pthread_mutex_lock(&notifierMutex);
	tsdPtr->eventReady = 1;

#   ifdef __CYGWIN__
	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#   else
	pthread_cond_broadcast(&tsdPtr->waitCV);
#   endif /* __CYGWIN__ */
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */















    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetTimer --
................................................................................
    int mode)			/* Either TCL_SERVICE_ALL, or
				 * TCL_SERVICE_NONE. */
{
    if (tclNotifierHooks.serviceModeHookProc) {
	tclNotifierHooks.serviceModeHookProc(mode);
	return;
    } else if (mode == TCL_SERVICE_ALL) {

#if TCL_THREADS
	StartNotifierThread("Tcl_ServiceModeHook");
#endif
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateFileHandler --
 *
 *	This function registers a file handler with the select notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Creates a new file handler structure.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateFileHandler(
    int fd,			/* Handle of stream to watch. */
    int mask,			/* OR'ed combination of TCL_READABLE,
				 * TCL_WRITABLE, and TCL_EXCEPTION: indicates
				 * conditions under which proc should be
				 * called. */
    Tcl_FileProc *proc,		/* Function to call for each selected
				 * event. */
    ClientData clientData)	/* Arbitrary data to pass to proc. */
{
    if (tclNotifierHooks.createFileHandlerProc) {
	tclNotifierHooks.createFileHandlerProc(fd, mask, proc, clientData);
	return;
    } else {
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
	FileHandler *filePtr;

	for (filePtr = tsdPtr->firstFileHandlerPtr; filePtr != NULL;
		filePtr = filePtr->nextPtr) {
	    if (filePtr->fd == fd) {
		break;
	    }
	}
	if (filePtr == NULL) {
	    filePtr = ckalloc(sizeof(FileHandler));
	    filePtr->fd = fd;
	    filePtr->readyMask = 0;
	    filePtr->nextPtr = tsdPtr->firstFileHandlerPtr;
	    tsdPtr->firstFileHandlerPtr = filePtr;
	}
	filePtr->proc = proc;
	filePtr->clientData = clientData;
	filePtr->mask = mask;

	/*
	 * Update the check masks for this file.
	 */

	if (mask & TCL_READABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.readable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (mask & TCL_WRITABLE) {
	    FD_SET(fd, &tsdPtr->checkMasks.writable);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (mask & TCL_EXCEPTION) {
	    FD_SET(fd, &tsdPtr->checkMasks.exception);
	} else {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}
	if (tsdPtr->numFdBits <= fd) {
	    tsdPtr->numFdBits = fd+1;
	}
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteFileHandler --
 *
 *	Cancel a previously-arranged callback arrangement for a file.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If a callback was previously registered on file, remove it.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteFileHandler(
    int fd)			/* Stream id for which to remove callback
				 * function. */
{
    if (tclNotifierHooks.deleteFileHandlerProc) {
	tclNotifierHooks.deleteFileHandlerProc(fd);
	return;
    } else {
	FileHandler *filePtr, *prevPtr;
	int i;
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Find the entry for the given file (and return if there isn't one).
	 */

	for (prevPtr = NULL, filePtr = tsdPtr->firstFileHandlerPtr; ;
		prevPtr = filePtr, filePtr = filePtr->nextPtr) {
	    if (filePtr == NULL) {
		return;
	    }
	    if (filePtr->fd == fd) {
		break;
	    }
	}

	/*
	 * Update the check masks for this file.
	 */

	if (filePtr->mask & TCL_READABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.readable);
	}
	if (filePtr->mask & TCL_WRITABLE) {
	    FD_CLR(fd, &tsdPtr->checkMasks.writable);
	}
	if (filePtr->mask & TCL_EXCEPTION) {
	    FD_CLR(fd, &tsdPtr->checkMasks.exception);
	}

	/*
	 * Find current max fd.
	 */

	if (fd+1 == tsdPtr->numFdBits) {
	    int numFdBits = 0;

	    for (i = fd-1; i >= 0; i--) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.writable)
			|| FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    numFdBits = i+1;
		    break;
		}
	    }
	    tsdPtr->numFdBits = numFdBits;
	}

	/*
	 * Clean up information in the callback record.
	 */

	if (prevPtr == NULL) {
	    tsdPtr->firstFileHandlerPtr = filePtr->nextPtr;
	} else {
	    prevPtr->nextPtr = filePtr->nextPtr;
	}
	ckfree(filePtr);

    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * FileHandlerEventProc --
................................................................................
	    filePtr->proc(filePtr->clientData, mask);
	}
	break;
    }
    return 1;
}
 
#if defined(TCL_THREADS) && defined(__CYGWIN__)

static DWORD __stdcall
NotifierProc(
    void *hwnd,
    unsigned int message,
    void *wParam,
    void *lParam)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (message != 1024) {
	return DefWindowProcW(hwnd, message, wParam, lParam);
    }

    /*
     * Process all of the runnable events.
     */

    tsdPtr->eventReady = 1;
    Tcl_ServiceAll();
    return 0;
}
#endif /* TCL_THREADS && __CYGWIN__ */
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitForEvent --

 *
 *	This function is called by Tcl_DoOneEvent to wait for new events on
 *	the message queue. If the block time is 0, then Tcl_WaitForEvent just
 *	polls without blocking.



 *
 * Results:
 *	Returns -1 if the select would block forever, otherwise returns 0.

 *
 * Side effects:
 *	Queues file events that are detected by the select.

 *
 *----------------------------------------------------------------------
 */

int
Tcl_WaitForEvent(
    const Tcl_Time *timePtr)		/* Maximum block time, or NULL. */
{
    if (tclNotifierHooks.waitForEventProc) {
	return tclNotifierHooks.waitForEventProc(timePtr);
    } else {
	FileHandler *filePtr;
	int mask;
	Tcl_Time vTime;
#ifdef TCL_THREADS
	int waitForFiles;
#   ifdef __CYGWIN__
	MSG msg;
#   endif /* __CYGWIN__ */
#else
	/*
	 * Impl. notes: timeout & timeoutPtr are used if, and only if threads
	 * are not enabled. They are the arguments for the regular select()
	 * used when the core is not thread-enabled.
	 */

	struct timeval timeout, *timeoutPtr;
	int numFound;
#endif /* TCL_THREADS */
	ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

	/*
	 * Set up the timeout structure. Note that if there are no events to
	 * check for, we return with a negative result rather than blocking
	 * forever.
	 */

	if (timePtr != NULL) {
	    /*
	     * TIP #233 (Virtualized Time). Is virtual time in effect? And do
	     * we actually have something to scale? If yes to both then we
	     * call the handler to do this scaling.
	     */

	    if (timePtr->sec != 0 || timePtr->usec != 0) {
		vTime = *timePtr;
		tclScaleTimeProcPtr(&vTime, tclTimeClientData);
		timePtr = &vTime;
	    }
#ifndef TCL_THREADS
	    timeout.tv_sec = timePtr->sec;
	    timeout.tv_usec = timePtr->usec;
	    timeoutPtr = &timeout;
	} else if (tsdPtr->numFdBits == 0) {
	    /*
	     * If there are no threads, no timeout, and no fds registered,
	     * then there are no events possible and we must avoid deadlock.
	     * Note that this is not entirely correct because there might be a
	     * signal that could interrupt the select call, but we don't
	     * handle that case if we aren't using threads.
	     */

	    return -1;
	} else {
	    timeoutPtr = NULL;
#endif /* !TCL_THREADS */
	}

#ifdef TCL_THREADS
	/*
	 * Start notifier thread and place this thread on the list of
	 * interested threads, signal the notifier thread, and wait for a
	 * response or a timeout.
	 */
	StartNotifierThread("Tcl_WaitForEvent");

	pthread_mutex_lock(&notifierMutex);

	if (timePtr != NULL && timePtr->sec == 0 && (timePtr->usec == 0
#if defined(__APPLE__) && defined(__LP64__)
		/*
		 * On 64-bit Darwin, pthread_cond_timedwait() appears to have
		 * a bug that causes it to wait forever when passed an
		 * absolute time which has already been exceeded by the system
		 * time; as a workaround, when given a very brief timeout,
		 * just do a poll. [Bug 1457797]
		 */
		|| timePtr->usec < 10
#endif /* __APPLE__ && __LP64__ */
		)) {
	    /*
	     * Cannot emulate a polling select with a polling condition
	     * variable. Instead, pretend to wait for files and tell the
	     * notifier thread what we are doing. The notifier thread makes
	     * sure it goes through select with its select mask in the same
	     * state as ours currently is. We block until that happens.
	     */

	    waitForFiles = 1;
	    tsdPtr->pollState = POLL_WANT;
	    timePtr = NULL;
	} else {
	    waitForFiles = (tsdPtr->numFdBits > 0);
	    tsdPtr->pollState = 0;
	}

	if (waitForFiles) {
	    /*
	     * Add the ThreadSpecificData structure of this thread to the list
	     * of ThreadSpecificData structures of all threads that are
	     * waiting on file events.
	     */

	    tsdPtr->nextPtr = waitingListPtr;
	    if (waitingListPtr) {
		waitingListPtr->prevPtr = tsdPtr;
	    }
	    tsdPtr->prevPtr = 0;
	    waitingListPtr = tsdPtr;
	    tsdPtr->onList = 1;

	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

	FD_ZERO(&tsdPtr->readyMasks.readable);
	FD_ZERO(&tsdPtr->readyMasks.writable);
	FD_ZERO(&tsdPtr->readyMasks.exception);

	if (!tsdPtr->eventReady) {
#ifdef __CYGWIN__
	    if (!PeekMessageW(&msg, NULL, 0, 0, 0)) {
		DWORD timeout;

		if (timePtr) {
		    timeout = timePtr->sec * 1000 + timePtr->usec / 1000;
		} else {
		    timeout = 0xFFFFFFFF;
		}
		pthread_mutex_unlock(&notifierMutex);
		MsgWaitForMultipleObjects(1, &tsdPtr->event, 0, timeout, 1279);
		pthread_mutex_lock(&notifierMutex);
	    }
#else
	    if (timePtr != NULL) {
	       Tcl_Time now;
	       struct timespec ptime;

	       Tcl_GetTime(&now);
	       ptime.tv_sec = timePtr->sec + now.sec + (timePtr->usec + now.usec) / 1000000;
	       ptime.tv_nsec = 1000 * ((timePtr->usec + now.usec) % 1000000);

	       pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex, &ptime);
	    } else {
	       pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
	    }
#endif /* __CYGWIN__ */
	}
	tsdPtr->eventReady = 0;

#ifdef __CYGWIN__
	while (PeekMessageW(&msg, NULL, 0, 0, 0)) {
	    /*
	     * Retrieve and dispatch the message.
	     */

	    DWORD result = GetMessageW(&msg, NULL, 0, 0);

	    if (result == 0) {
		PostQuitMessage(msg.wParam);
		/* What to do here? */
	    } else if (result != (DWORD) -1) {
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	    }
	}
	ResetEvent(tsdPtr->event);
#endif /* __CYGWIN__ */

	if (waitForFiles && tsdPtr->onList) {
	    /*
	     * Remove the ThreadSpecificData structure of this thread from the
	     * waiting list. Alert the notifier thread to recompute its select
	     * masks - skipping this caused a hang when trying to close a pipe
	     * which the notifier thread was still doing a select on.
	     */

	    if (tsdPtr->prevPtr) {
		tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
	    } else {
		waitingListPtr = tsdPtr->nextPtr;
	    }
	    if (tsdPtr->nextPtr) {
		tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
	    }
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	    tsdPtr->onList = 0;
	    if ((write(triggerPipe, "", 1) == -1) && (errno != EAGAIN)) {
		Tcl_Panic("Tcl_WaitForEvent: %s",
			"unable to write to triggerPipe");
	    }
	}

#else
	tsdPtr->readyMasks = tsdPtr->checkMasks;
	numFound = select(tsdPtr->numFdBits, &tsdPtr->readyMasks.readable,
		&tsdPtr->readyMasks.writable, &tsdPtr->readyMasks.exception,
		timeoutPtr);

	/*
	 * Some systems don't clear the masks after an error, so we have to do
	 * it here.
	 */

	if (numFound == -1) {
	    FD_ZERO(&tsdPtr->readyMasks.readable);
	    FD_ZERO(&tsdPtr->readyMasks.writable);
	    FD_ZERO(&tsdPtr->readyMasks.exception);
	}
#endif /* TCL_THREADS */

	/*
	 * Queue all detected file events before returning.
	 */

	for (filePtr = tsdPtr->firstFileHandlerPtr; (filePtr != NULL);
		filePtr = filePtr->nextPtr) {
	    mask = 0;
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.readable)) {
		mask |= TCL_READABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.writable)) {
		mask |= TCL_WRITABLE;
	    }
	    if (FD_ISSET(filePtr->fd, &tsdPtr->readyMasks.exception)) {
		mask |= TCL_EXCEPTION;
	    }

	    if (!mask) {
		continue;
	    }

	    /*
	     * Don't bother to queue an event if the mask was previously
	     * non-zero since an event must still be on the queue.
	     */

	    if (filePtr->readyMask == 0) {
		FileHandlerEvent *fileEvPtr =
			ckalloc(sizeof(FileHandlerEvent));

		fileEvPtr->header.proc = FileHandlerEventProc;
		fileEvPtr->fd = filePtr->fd;
		Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL);
	    }
	    filePtr->readyMask = mask;
	}
#ifdef TCL_THREADS
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
	return 0;
    }
}
 
#ifdef TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * NotifierThreadProc --
 *
 *	This routine is the initial (and only) function executed by the
 *	special notifier thread. Its job is to wait for file descriptors to
 *	become readable or writable or to have an exception condition and then
 *	to notify other threads who are interested in this information by
 *	signalling a condition variable. Other threads can signal this
 *	notifier thread of a change in their interests by writing a single
 *	byte to a special pipe that the notifier thread is monitoring.
 *
 * Result:
 *	None. Once started, this routine never exits. It dies with the overall
 *	process.
 *
 * Side effects:
 *	The trigger pipe used to signal the notifier thread is created when
 *	the notifier thread first starts.
 *
 *----------------------------------------------------------------------
 */

static TCL_NORETURN void
NotifierThreadProc(
    ClientData clientData)	/* Not used. */
{

    ThreadSpecificData *tsdPtr;
    fd_set readableMask;
    fd_set writableMask;
    fd_set exceptionMask;
    int fds[2];
    int i, numFdBits = 0, receivePipe;
    long found;
    struct timeval poll = {0., 0.}, *timePtr;
    char buf[2];

    if (pipe(fds) != 0) {
	Tcl_Panic("NotifierThreadProc: %s", "could not create trigger pipe");
    }

    receivePipe = fds[0];

    if (TclUnixSetBlockingMode(receivePipe, TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe non blocking");
    }
    if (TclUnixSetBlockingMode(fds[1], TCL_MODE_NONBLOCKING) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe non blocking");
    }
    if (fcntl(receivePipe, F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make receive pipe close-on-exec");
    }
    if (fcntl(fds[1], F_SETFD, FD_CLOEXEC) < 0) {
	Tcl_Panic("NotifierThreadProc: %s",
		"could not make trigger pipe close-on-exec");
    }

    /*
     * Install the write end of the pipe into the global variable.
     */

    pthread_mutex_lock(&notifierMutex);
    triggerPipe = fds[1];

    /*
     * Signal any threads that are waiting.
     */

    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    /*
     * Look for file events and report them to interested threads.
     */

    while (1) {
	FD_ZERO(&readableMask);
	FD_ZERO(&writableMask);
	FD_ZERO(&exceptionMask);

	/*
	 * Compute the logical OR of the select masks from all the waiting
	 * notifiers.
	 */

	pthread_mutex_lock(&notifierMutex);
	timePtr = NULL;
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)) {
		    FD_SET(i, &readableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)) {
		    FD_SET(i, &writableMask);
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)) {
		    FD_SET(i, &exceptionMask);
		}
	    }
	    if (tsdPtr->numFdBits > numFdBits) {
		numFdBits = tsdPtr->numFdBits;
	    }
	    if (tsdPtr->pollState & POLL_WANT) {
		/*
		 * Here we make sure we go through select() with the same mask
		 * bits that were present when the thread tried to poll.
		 */

		tsdPtr->pollState |= POLL_DONE;
		timePtr = &poll;
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Set up the select mask to include the receive pipe.
	 */

	if (receivePipe >= numFdBits) {
	    numFdBits = receivePipe + 1;
	}
	FD_SET(receivePipe, &readableMask);

	if (select(numFdBits, &readableMask, &writableMask, &exceptionMask,
		timePtr) == -1) {
	    /*
	     * Try again immediately on an error.
	     */

	    continue;
	}

	/*
	 * Alert any threads that are waiting on a ready file descriptor.
	 */

	pthread_mutex_lock(&notifierMutex);
	for (tsdPtr = waitingListPtr; tsdPtr; tsdPtr = tsdPtr->nextPtr) {
	    found = 0;

	    for (i = tsdPtr->numFdBits-1; i >= 0; --i) {
		if (FD_ISSET(i, &tsdPtr->checkMasks.readable)
			&& FD_ISSET(i, &readableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.readable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.writable)
			&& FD_ISSET(i, &writableMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.writable);
		    found = 1;
		}
		if (FD_ISSET(i, &tsdPtr->checkMasks.exception)
			&& FD_ISSET(i, &exceptionMask)) {
		    FD_SET(i, &tsdPtr->readyMasks.exception);
		    found = 1;
		}
	    }

	    if (found || (tsdPtr->pollState & POLL_DONE)) {
		tsdPtr->eventReady = 1;
		if (tsdPtr->onList) {
		    /*
		     * Remove the ThreadSpecificData structure of this thread
		     * from the waiting list. This prevents us from
		     * continuously spining on select until the other threads

		     * runs and services the file event.
		     */

		    if (tsdPtr->prevPtr) {
			tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
		    } else {
			waitingListPtr = tsdPtr->nextPtr;
		    }
		    if (tsdPtr->nextPtr) {
			tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
		    }
		    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
		    tsdPtr->onList = 0;
		    tsdPtr->pollState = 0;
		}
#ifdef __CYGWIN__
		PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#else /* __CYGWIN__ */
		pthread_cond_broadcast(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */
	    }
	}
	pthread_mutex_unlock(&notifierMutex);

	/*
	 * Consume the next byte from the notifier pipe if the pipe was
	 * readable. Note that there may be multiple bytes pending, but to
	 * avoid a race condition we only read one at a time.
	 */

	if (FD_ISSET(receivePipe, &readableMask)) {
	    i = read(receivePipe, buf, 1);

	    if ((i == 0) || ((i == 1) && (buf[0] == 'q'))) {
		/*
		 * Someone closed the write end of the pipe or sent us a Quit
		 * message [Bug: 4139] and then closed the write end of the
		 * pipe so we need to shut down the notifier thread.
		 */

		break;
	    }
	}
    }

    /*
     * Clean up the read end of the pipe and signal any threads waiting on
     * termination of the notifier thread.
     */

    close(receivePipe);
    pthread_mutex_lock(&notifierMutex);
    triggerPipe = -1;
    pthread_cond_broadcast(&notifierCV);
    pthread_mutex_unlock(&notifierMutex);

    TclpThreadExit(0);
}
 
#if defined(HAVE_PTHREAD_ATFORK)
/*
 *----------------------------------------------------------------------
 *
 * AtForkChild --
................................................................................
		    className, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    ResetEvent(tsdPtr->event);
#else
	    pthread_cond_destroy(&tsdPtr->waitCV);
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif

	    /*
	     * In case, we had multiple threads running before the fork,
	     * make sure, we don't try to reach out to their thread local data.
	     */
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;

	    /*
................................................................................

    Tcl_InitNotifier();
}
#endif /* HAVE_PTHREAD_ATFORK */

#endif /* TCL_THREADS */






















































































































































#endif /* !HAVE_COREFOUNDATION */
 
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */


|
|
<


>





<
<
<
|


<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<



>



<



>


<
|
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<







 







<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
|
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<







 







>
|
>
>
>
>
>












>













>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







 







>



<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
>







 







|
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
|
<



<
>

<
<
<
>
>
>

|
<
>


<
>




<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
|
<
<
<
>
|
<
<
<
<
<
<
<
<
|
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
|
|
|
|
|
<
>
|
|

|
|
|
|
|
|
|
|
|
|
|
|

|

|

<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<







 







>







 







>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>

|







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
..
67
68
69
70
71
72
73






















































74











































































































75
76
77
78
79
80
81
..
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
...
193
194
195
196
197
198
199
200
201
202
203




































































































































































204
205
206
207
208
209
210
211
...
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
...
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
...
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
/*
 * tclUnixNotfy.c --
 *
 *	This file contains subroutines shared by all notifier backend
 *	implementations on *nix platforms.

 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 * Copyright (c) 2016 Lucio Andrés Illanes Albornoz <[email protected]>
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */




#include <poll.h>

/*












































































































































































 * Static routines defined in this file.
 */

#ifdef NOTIFIER_SELECT
#ifdef TCL_THREADS
static TCL_NORETURN void NotifierThreadProc(ClientData clientData);
#if defined(HAVE_PTHREAD_ATFORK)

static void	AtForkChild(void);
#endif /* HAVE_PTHREAD_ATFORK */
#endif /* TCL_THREADS */
#endif /* NOTIFIER_SELECT */
static int	FileHandlerEventProc(Tcl_Event *evPtr, int flags);
 

#ifdef NOTIFIER_SELECT






















































#if TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * StartNotifierThread --
 *
 *	Start a notfier thread and wait for the notifier pipe to be created.
................................................................................

	    notifierThreadRunning = 1;
	}
	pthread_mutex_unlock(&notifierInitMutex);
    }
}
#endif /* TCL_THREADS */






















































#endif /* NOTIFIER_SELECT */











































































































 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_AlertNotifier --
 *
 *	Wake up the specified notifier from any thread. This routine is called
................................................................................
 *	routine is called. This routine is guaranteed not to be called on a
 *	given notifier after Tcl_FinalizeNotifier is called for that notifier.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	select(2) notifier:
 *		signals the notifier condition variable for the specified
 *		notifier.
 *	epoll(7) notifier:
 *		write(2)s to the eventfd(2) of the specified thread.
 *	kqueue(2) notifier:
 *		write(2)s to the trigger pipe(2) of the specified thread.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_AlertNotifier(
    ClientData clientData)
{
    if (tclNotifierHooks.alertNotifierProc) {
	tclNotifierHooks.alertNotifierProc(clientData);
	return;
    } else {
#ifdef NOTIFIER_SELECT
#ifdef TCL_THREADS
	ThreadSpecificData *tsdPtr = clientData;

	pthread_mutex_lock(&notifierMutex);
	tsdPtr->eventReady = 1;

#   ifdef __CYGWIN__
	PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#   else
	pthread_cond_broadcast(&tsdPtr->waitCV);
#   endif /* __CYGWIN__ */
	pthread_mutex_unlock(&notifierMutex);
#endif /* TCL_THREADS */
#else
	ThreadSpecificData *tsdPtr = clientData;
#if defined(NOTIFIER_EPOLL) && defined(HAVE_EVENTFD)
	uint64_t eventFdVal = 1;
	if (write(tsdPtr->triggerEventFd, &eventFdVal,
		sizeof(eventFdVal)) != sizeof(eventFdVal)) {
	    Tcl_Panic("Tcl_AlertNotifier: unable to write to %p->triggerEventFd",
		(void *)tsdPtr);
#else
	if (write(tsdPtr->triggerPipe[1], "", 1) != 1) {
	    Tcl_Panic("Tcl_AlertNotifier: unable to write to %p->triggerPipe",
		(void *)tsdPtr);
#endif /* NOTIFIER_EPOLL && HAVE_EVENTFD */
	}
#endif /* NOTIFIER_SELECT */
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * Tcl_SetTimer --
................................................................................
    int mode)			/* Either TCL_SERVICE_ALL, or
				 * TCL_SERVICE_NONE. */
{
    if (tclNotifierHooks.serviceModeHookProc) {
	tclNotifierHooks.serviceModeHookProc(mode);
	return;
    } else if (mode == TCL_SERVICE_ALL) {
#ifdef NOTIFIER_SELECT
#if TCL_THREADS
	StartNotifierThread("Tcl_ServiceModeHook");
#endif




































































































































































#endif /* NOTIFIER_SELECT */
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * FileHandlerEventProc --
................................................................................
	    filePtr->proc(filePtr->clientData, mask);
	}
	break;
    }
    return 1;
}
 
#ifdef NOTIFIER_SELECT






















#ifdef TCL_THREADS

/*
 *----------------------------------------------------------------------
 *

 * AlertSingleThread --
 *



 *	Notify a single thread that is waiting on a file descriptor to become
 *	readable or writable or to have an exception condition.
 *	notifierMutex must be held.
 *
 * Result:

 *	None.
 *
 * Side effects:

 *	The condition variable associated with the thread is broadcasted.
 *
 *----------------------------------------------------------------------
 */
































































































































































































































































































static void



AlertSingleThread(
	ThreadSpecificData *tsdPtr)








{





























































































































    tsdPtr->eventReady = 1;
    if (tsdPtr->onList) {
        /*
         * Remove the ThreadSpecificData structure of this thread
         * from the waiting list. This prevents us from

         * continuously spinning on epoll_wait until the other
         * threads runs and services the file event.
         */

        if (tsdPtr->prevPtr) {
    	    tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
        } else {
    	    waitingListPtr = tsdPtr->nextPtr;
        }
        if (tsdPtr->nextPtr) {
    	    tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
        }
        tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
        tsdPtr->onList = 0;
        tsdPtr->pollState = 0;
    }
#ifdef __CYGWIN__
    PostMessageW(tsdPtr->hwnd, 1024, 0, 0);
#else /* __CYGWIN__ */
    pthread_cond_broadcast(&tsdPtr->waitCV);
#endif /* __CYGWIN__ */





































}
 
#if defined(HAVE_PTHREAD_ATFORK)
/*
 *----------------------------------------------------------------------
 *
 * AtForkChild --
................................................................................
		    className, 0, 0, 0, 0, 0, NULL, NULL,
		    TclWinGetTclInstance(), NULL);
	    ResetEvent(tsdPtr->event);
#else
	    pthread_cond_destroy(&tsdPtr->waitCV);
	    pthread_cond_init(&tsdPtr->waitCV, NULL);
#endif

	    /*
	     * In case, we had multiple threads running before the fork,
	     * make sure, we don't try to reach out to their thread local data.
	     */
	    tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;

	    /*
................................................................................

    Tcl_InitNotifier();
}
#endif /* HAVE_PTHREAD_ATFORK */

#endif /* TCL_THREADS */

#endif /* NOTIFIER_SELECT */
#ifndef HAVE_COREFOUNDATION	/* Darwin/Mac OS X CoreFoundation notifier is
				 * in tclMacOSXNotify.c */
/*
 *----------------------------------------------------------------------
 *
 * TclUnixWaitForFile --
 *
 *	This function waits synchronously for a file to become readable or
 *	writable, with an optional timeout.
 *
 * Results:
 *	The return value is an OR'ed combination of TCL_READABLE,
 *	TCL_WRITABLE, and TCL_EXCEPTION, indicating the conditions that are
 *	present on file at the time of the return. This function will not
 *	return until either "timeout" milliseconds have elapsed or at least
 *	one of the conditions given by mask has occurred for file (a return
 *	value of 0 means that a timeout occurred). No normal events will be
 *	serviced during the execution of this function.
 *
 * Side effects:
 *	Time passes.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixWaitForFile(
    int fd,			/* Handle for file on which to wait. */
    int mask,			/* What to wait for: OR'ed combination of
				 * TCL_READABLE, TCL_WRITABLE, and
				 * TCL_EXCEPTION. */
    int timeout)		/* Maximum amount of time to wait for one of
				 * the conditions in mask to occur, in
				 * milliseconds. A value of 0 means don't wait
				 * at all, and a value of -1 means wait
				 * forever. */
{
    Tcl_Time abortTime = {0, 0}, now; /* silence gcc 4 warning */
    struct timeval blockTime, *timeoutPtr;
    struct pollfd pollFds[1];
    int numFound, result = 0, pollTimeout;

    /*
     * If there is a non-zero finite timeout, compute the time when we give
     * up.
     */

    if (timeout > 0) {
	Tcl_GetTime(&now);
	abortTime.sec = now.sec + timeout/1000;
	abortTime.usec = now.usec + (timeout%1000)*1000;
	if (abortTime.usec >= 1000000) {
	    abortTime.usec -= 1000000;
	    abortTime.sec += 1;
	}
	timeoutPtr = &blockTime;
    } else if (timeout == 0) {
	timeoutPtr = &blockTime;
	blockTime.tv_sec = 0;
	blockTime.tv_usec = 0;
    } else {
	timeoutPtr = NULL;
    }

    /*
     * Setup the pollfd structure for the fd.
     */

    pollFds[0].fd = fd;
    pollFds[0].events = pollFds[0].revents = 0;
    if (mask & TCL_READABLE) {
	pollFds[0].events |= (POLLIN | POLLHUP);
    }
    if (mask & TCL_WRITABLE) {
	pollFds[0].events |= POLLOUT;
    }
    if (mask & TCL_EXCEPTION) {
	pollFds[0].events |= POLLERR;
    }

    /*
     * Loop in a mini-event loop of our own, waiting for either the file to
     * become ready or a timeout to occur.
     */

    while (1) {
	if (timeout > 0) {
	    blockTime.tv_sec = abortTime.sec - now.sec;
	    blockTime.tv_usec = abortTime.usec - now.usec;
	    if (blockTime.tv_usec < 0) {
		blockTime.tv_sec -= 1;
		blockTime.tv_usec += 1000000;
	    }
	    if (blockTime.tv_sec < 0) {
		blockTime.tv_sec = 0;
		blockTime.tv_usec = 0;
	    }
	}

	/*
	 * Wait for the event or a timeout.
	 */

	if (!timeoutPtr) {
	    pollTimeout = -1;
	} else if (!timeoutPtr->tv_sec && !timeoutPtr->tv_usec) {
	    pollTimeout = 0;
	} else {
	    pollTimeout = (int)timeoutPtr->tv_sec * 1000;
	    if (timeoutPtr->tv_usec) {
		pollTimeout += ((int)timeoutPtr->tv_usec / 1000);
	    }
	}
	numFound = poll(pollFds, 1, pollTimeout);
	if (numFound == 1) {
	    result = 0;
	    if (pollFds[0].events & (POLLIN | POLLHUP)) {
		result |= TCL_READABLE;
	    }
	    if (pollFds[0].events & POLLOUT) {
		result |= TCL_WRITABLE;
	    }
	    if (pollFds[0].events & POLLERR) {
		result |= TCL_EXCEPTION;
	    }
	    if (result) {
		break;
	    }
	}
	if (timeout == 0) {
	    break;
	}
	if (timeout < 0) {
	    continue;
	}

	/*
	 * The select returned early, so we need to recompute the timeout.
	 */

	Tcl_GetTime(&now);
	if ((abortTime.sec < now.sec)
		|| (abortTime.sec==now.sec && abortTime.usec<=now.usec)) {
	    break;
	}
    }
    return result;
}
#endif /* !HAVE_COREFOUNDATION */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */