/
scheduler.c
1158 lines (868 loc) · 31.5 KB
/
scheduler.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
/*
Copyright (C) 2007-2010, Parrot Foundation.
$Id$
=head1 NAME
src/scheduler.c - The core routines for the concurrency scheduler
=head1 DESCRIPTION
Each interpreter has a concurrency scheduler element in its core struct. The
scheduler is responsible for receiveing, dispatching, and monitoring events,
exceptions, async I/O, and concurrent tasks (threads).
=cut
*/
#include "parrot/parrot.h"
#include "parrot/scheduler_private.h"
#include "parrot/runcore_api.h"
#include "pmc/pmc_scheduler.h"
#include "pmc/pmc_task.h"
#include "pmc/pmc_timer.h"
#include "scheduler.str"
#define CX_DEBUG 0
/* HEADERIZER HFILE: include/parrot/scheduler.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static void scheduler_process_messages(PARROT_INTERP,
ARGMOD(PMC *scheduler))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*scheduler);
static void scheduler_process_wait_list(PARROT_INTERP,
ARGMOD(PMC *scheduler))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*scheduler);
#define ASSERT_ARGS_scheduler_process_messages __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp) \
, PARROT_ASSERT_ARG(scheduler))
#define ASSERT_ARGS_scheduler_process_wait_list __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp) \
, PARROT_ASSERT_ARG(scheduler))
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/*
=head2 Scheduler Interface Functions
Functions to interface with the concurrency scheduler.
=over 4
=item C<void Parrot_cx_init_scheduler(PARROT_INTERP)>
Initalize the concurrency scheduler for the interpreter.
=cut
*/
void
Parrot_cx_init_scheduler(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_init_scheduler)
if (!interp->parent_interpreter) {
PMC *scheduler;
/* Add the very first interpreter to the list of interps. */
pt_add_to_interpreters(interp, NULL);
scheduler = Parrot_pmc_new(interp, enum_class_Scheduler);
scheduler = VTABLE_share_ro(interp, scheduler);
interp->scheduler = scheduler;
}
}
/*
=item C<void Parrot_cx_check_tasks(PARROT_INTERP, PMC *scheduler)>
If a wake request has been received, handle tasks.
=cut
*/
void
Parrot_cx_check_tasks(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_check_tasks)
if (SCHEDULER_wake_requested_TEST(scheduler))
Parrot_cx_handle_tasks(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_handle_tasks(PARROT_INTERP, PMC *scheduler)>
Handle the pending tasks in the scheduler's task list. Returns when there are
no more pending tasks. Returns 0 to terminate the scheduler runloop, or 1 to
continue the runloop.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_handle_tasks(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_handle_tasks)
SCHEDULER_wake_requested_CLEAR(scheduler);
Parrot_cx_refresh_task_list(interp, scheduler);
while (VTABLE_get_integer(interp, scheduler) > 0) {
PMC * const task = VTABLE_pop_pmc(interp, scheduler);
if (!PMC_IS_NULL(task)) {
PMC * const type_pmc = VTABLE_get_attr_str(interp, task, CONST_STRING(interp, "type"));
STRING * const type = VTABLE_get_string(interp, type_pmc);
if (Parrot_str_equal(interp, type, CONST_STRING(interp, "callback"))) {
Parrot_cx_invoke_callback(interp, task);
}
else if (Parrot_str_equal(interp, type, CONST_STRING(interp, "timer"))) {
Parrot_cx_timer_invoke(interp, task);
}
else if (Parrot_str_equal(interp, type, CONST_STRING(interp, "event"))) {
PMC * const handler = Parrot_cx_find_handler_for_task(interp, task);
if (!PMC_IS_NULL(handler)) {
PMC * const handler_sub = VTABLE_get_attr_str(interp, handler, CONST_STRING(interp, "code"));
Parrot_pcc_invoke_sub_from_c_args(interp, handler_sub,
"PP->", handler, task);
}
}
else {
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Unknown task type '%Ss'.\n", type);
}
Parrot_cx_delete_task(interp, task);
}
/* If the scheduler was flagged to terminate, make sure you process all
* tasks. */
if (SCHEDULER_terminate_requested_TEST(scheduler))
Parrot_cx_refresh_task_list(interp, scheduler);
} /* end of pending tasks */
}
/*
=item C<void Parrot_cx_refresh_task_list(PARROT_INTERP, PMC *scheduler)>
Tell the scheduler to perform maintenance on its list of active tasks, checking
for completed timers or sleep events, sorting for priority, checking for
messages, etc.
=cut
*/
void
Parrot_cx_refresh_task_list(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_refresh_task_list)
scheduler_process_wait_list(interp, scheduler);
scheduler_process_messages(interp, scheduler);
/* TODO: Sort the task list index */
SCHEDULER_cache_valid_SET(scheduler);
return;
}
/*
=item C<void Parrot_cx_runloop_wake(PARROT_INTERP, PMC *scheduler)>
Wake a sleeping scheduler runloop (generally called when new tasks are added to
the scheduler's task list).
=cut
*/
void
Parrot_cx_runloop_wake(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_runloop_wake)
enable_event_checking(interp);
SCHEDULER_wake_requested_SET(scheduler);
}
/*
=item C<void Parrot_cx_runloop_end(PARROT_INTERP)>
Schedule an event to terminate the scheduler runloop.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_runloop_end(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_runloop_end)
SCHEDULER_terminate_requested_SET(interp->scheduler);
Parrot_cx_handle_tasks(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_schedule_task(PARROT_INTERP, PMC *task)>
Add a task to scheduler's task list. Cannot be called across
interpreters/threads, must be called from within the interpreter's runloop.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_schedule_task)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
VTABLE_push_pmc(interp, interp->scheduler, task);
}
/*
=item C<PMC * Parrot_cx_peek_task(PARROT_INTERP)>
Retrieve the the top task on the scheduler's task list, but don't remove it
from the list.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_peek_task(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_peek_task)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
return VTABLE_pop_pmc(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_schedule_timer(PARROT_INTERP, STRING *type, FLOATVAL
duration, FLOATVAL interval, INTVAL repeat, PMC *sub)>
Create a new timer event due at C<diff> from now, repeated at C<interval>
and running the passed C<sub>.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_timer(PARROT_INTERP,
ARGIN_NULLOK(STRING *type), FLOATVAL duration, FLOATVAL interval,
INTVAL repeat, ARGIN_NULLOK(PMC *sub))
{
ASSERT_ARGS(Parrot_cx_schedule_timer)
PMC * const timer = Parrot_pmc_new(interp, enum_class_Timer);
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_NSEC, duration);
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_INTERVAL, interval);
VTABLE_set_integer_keyed_int(interp, timer, PARROT_TIMER_REPEAT, repeat);
if (!PMC_IS_NULL(sub))
VTABLE_set_pmc_keyed_int(interp, timer, PARROT_TIMER_HANDLER, sub);
if (!STRING_IS_NULL(type))
VTABLE_set_string_native(interp, timer, type);
if (repeat && FLOAT_IS_ZERO(interval))
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_INTERVAL, duration);
Parrot_cx_schedule_task(interp, timer);
}
/*
=item C<void Parrot_cx_schedule_repeat(PARROT_INTERP, PMC *task)>
Add a repeat task to scheduler's task list.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_repeat(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_schedule_repeat)
INTVAL repeat = VTABLE_get_integer_keyed_int(interp, task,
PARROT_TIMER_REPEAT);
FLOATVAL duration = VTABLE_get_number_keyed_int(interp, task,
PARROT_TIMER_INTERVAL);
if (repeat != 0) {
PMC * const repeat_task = VTABLE_clone(interp, task);
VTABLE_set_number_keyed_int(interp, repeat_task, PARROT_TIMER_NSEC, duration);
if (repeat > 0)
VTABLE_set_integer_keyed_int(interp, repeat_task,
PARROT_TIMER_REPEAT, repeat - 1);
Parrot_cx_schedule_task(interp, repeat_task);
}
}
/*
=item C<void Parrot_cx_schedule_callback(PARROT_INTERP, PMC *user_data, char
*ext_data)>
Create a new callback event, with an argument for the call.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_callback(PARROT_INTERP,
ARGIN(PMC *user_data), ARGIN(char *ext_data))
{
ASSERT_ARGS(Parrot_cx_schedule_callback)
PMC * const callback = Parrot_pmc_new(interp, enum_class_Task);
Parrot_Task_attributes * const task_struct = PARROT_TASK(callback);
task_struct->type = CONST_STRING(interp, "callback");
task_struct->data = user_data;
task_struct->cb_data = ext_data;
Parrot_cx_schedule_task(interp, callback);
}
/*
=item C<void Parrot_cx_request_suspend_for_gc(PARROT_INTERP)>
Tell the scheduler to suspend for GC at the next safe pause.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_request_suspend_for_gc(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_request_suspend_for_gc)
#if CX_DEBUG
fprintf(stderr, "requesting gc suspend [interp=%p]\n", interp);
#endif
Parrot_cx_send_message(interp, CONST_STRING(interp, "suspend_for_gc"), PMCNULL);
}
/*
=item C<void Parrot_cx_delete_task(PARROT_INTERP, PMC *task)>
Remove a task from the scheduler's task list.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_delete_task)
if (interp->scheduler) {
const INTVAL tid = VTABLE_get_integer(interp, task);
VTABLE_delete_keyed_int(interp, interp->scheduler, tid);
}
else if (interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
}
/*
=item C<PMC * Parrot_cx_delete_suspend_for_gc(PARROT_INTERP)>
Remove a message that would suspend GC from the message queue. (Provided for
backward compatibility in the threads implementation.)
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_delete_suspend_for_gc(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_delete_suspend_for_gc)
if (interp->scheduler) {
STRING *suspend_str = CONST_STRING(interp, "suspend_for_gc");
Parrot_Scheduler_attributes * sched_struct = PARROT_SCHEDULER(interp->scheduler);
INTVAL num_tasks, index;
#if CX_DEBUG
fprintf(stderr, "called delete_suspend_for_gc\n");
#endif
#if CX_DEBUG
fprintf(stderr, "locking msg_lock (delete) [interp=%p]\n", interp);
#endif
LOCK(sched_struct->msg_lock);
/* Search the task index for GC suspend tasks */
num_tasks = VTABLE_elements(interp, sched_struct->messages);
for (index = 0; index < num_tasks; ++index) {
PMC *message = VTABLE_get_pmc_keyed_int(interp, sched_struct->messages, index);
if (!PMC_IS_NULL(message)
&& Parrot_str_equal(interp, VTABLE_get_string(interp, message),
suspend_str)) {
VTABLE_delete_keyed_int(interp, sched_struct->messages, index);
UNLOCK(sched_struct->msg_lock);
return message;
}
}
#if CX_DEBUG
fprintf(stderr, "unlocking msg_lock (delete) [interp=%p]\n", interp);
#endif
UNLOCK(sched_struct->msg_lock);
}
else
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
return PMCNULL;
}
/*
=item C<void Parrot_cx_add_handler_local(PARROT_INTERP, PMC *handler)>
Add a handler to the current context's list of handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_add_handler_local(PARROT_INTERP, ARGIN(PMC *handler))
{
ASSERT_ARGS(Parrot_cx_add_handler_local)
if (PMC_IS_NULL(Parrot_pcc_get_handlers(interp, interp->ctx)))
Parrot_pcc_set_handlers(interp, interp->ctx, Parrot_pmc_new(interp,
enum_class_ResizablePMCArray));
VTABLE_unshift_pmc(interp, Parrot_pcc_get_handlers(interp, interp->ctx), handler);
}
/*
=item C<void Parrot_cx_delete_handler_local(PARROT_INTERP, STRING
*handler_type)>
Remove the top task handler of a particular type from the context's list of
handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_handler_local(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_delete_handler_local)
PMC *handlers = Parrot_pcc_get_handlers(interp, interp->ctx);
if (PMC_IS_NULL(handlers))
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"No handler to delete.");
if (STRING_IS_NULL(handler_type) || STRING_IS_EMPTY(handler_type))
VTABLE_shift_pmc(interp, handlers);
else {
/* Loop from newest handler to oldest handler. */
STRING *exception_str = CONST_STRING(interp, "exception");
STRING *event_str = CONST_STRING(interp, "event");
STRING *handler_str = CONST_STRING(interp, "ExceptionHandler");
const INTVAL elements = VTABLE_elements(interp, handlers);
INTVAL index;
typedef enum { Hunknown, Hexception, Hevent } Htype;
const Htype htype =
Parrot_str_equal(interp, handler_type, exception_str) ?
Hexception :
Parrot_str_equal(interp, handler_type, event_str) ?
Hevent :
Hunknown;
STRING * const handler_name = (htype == Hexception) ? handler_str : (STRING *)NULL;
for (index = 0; index < elements; ++index) {
PMC * const handler = VTABLE_get_pmc_keyed_int(interp, handlers, index);
if (!PMC_IS_NULL(handler)) {
switch (htype) {
case Hexception:
if (VTABLE_isa(interp, handler, handler_name)) {
VTABLE_set_pmc_keyed_int(interp, handlers, index, PMCNULL);
return;
}
break;
case Hevent:
if (handler->vtable->base_type == enum_class_EventHandler) {
VTABLE_set_pmc_keyed_int(interp, handlers, index, PMCNULL);
return;
}
break;
default:
break;
}
}
}
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_INVALID_OPERATION, "No handler to delete.");
}
}
/*
=item C<INTVAL Parrot_cx_count_handlers_local(PARROT_INTERP, STRING
*handler_type)>
Count the number of active handlers of a particular type from the
context's list of handlers.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_cx_count_handlers_local(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_count_handlers_local)
PMC * const handlers = Parrot_pcc_get_handlers(interp, interp->ctx);
INTVAL elements;
if (PMC_IS_NULL(handlers))
return 0;
elements = VTABLE_elements(interp, handlers);
if (STRING_IS_NULL(handler_type) || STRING_IS_EMPTY(handler_type))
return elements;
/* Loop from newest handler to oldest handler. */
{
STRING *exception_str = CONST_STRING(interp, "exception");
STRING *event_str = CONST_STRING(interp, "event");
STRING *handler_str = CONST_STRING(interp, "ExceptionHandler");
INTVAL count = 0;
INTVAL index;
typedef enum { Hunknown, Hexception, Hevent } Htype;
const Htype htype =
(Parrot_str_equal(interp, handler_type, exception_str)) ?
Hexception :
(Parrot_str_equal(interp, handler_type, event_str)) ?
Hevent :
Hunknown;
STRING * const handler_name = (htype == Hexception) ? handler_str : (STRING *)NULL;
for (index = 0; index < elements; ++index) {
PMC * const handler = VTABLE_get_pmc_keyed_int(interp, handlers, index);
if (!PMC_IS_NULL(handler)) {
switch (htype) {
case Hexception:
if (VTABLE_isa(interp, handler, handler_name))
++count;
break;
case Hevent:
if (handler->vtable->base_type == enum_class_EventHandler)
++count;
break;
default:
break;
}
}
}
return count;
}
}
/*
=item C<void Parrot_cx_add_handler(PARROT_INTERP, PMC *handler)>
Add a task handler to scheduler's list of handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_add_handler(PARROT_INTERP, ARGIN(PMC *handler))
{
ASSERT_ARGS(Parrot_cx_add_handler)
STRING * const add_handler = CONST_STRING(interp, "add_handler");
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, add_handler, "P->", handler);
}
/*
=item C<void Parrot_cx_delete_handler_typed(PARROT_INTERP, STRING
*handler_type)>
Remove the top task handler of a particular type from the scheduler's list of
handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_handler_typed(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_delete_handler_typed)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "delete_handler"), "S->", handler_type);
}
/*
=item C<INTVAL Parrot_cx_count_handlers_typed(PARROT_INTERP, STRING
*handler_type)>
Count the number of active handlers of a particular type (event, exception) in
the concurrency scheduler.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_cx_count_handlers_typed(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_count_handlers_typed)
INTVAL count = 0;
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "count_handlers"), "S->I", handler_type, &count);
return count;
}
/*
=back
=head2 Scheduler Message Interface Functions
Functions that are used to interface with the message queue in the concurrency
scheduler.
=over 4
=item C<void Parrot_cx_send_message(PARROT_INTERP, STRING *messagetype, PMC
*payload)>
Send a message to a scheduler in a different interpreter/thread.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_send_message(PARROT_INTERP, ARGIN(STRING *messagetype), SHIM(PMC *payload))
{
ASSERT_ARGS(Parrot_cx_send_message)
if (interp->scheduler) {
Parrot_Scheduler_attributes * sched_struct = PARROT_SCHEDULER(interp->scheduler);
PMC *message = Parrot_pmc_new(interp, enum_class_SchedulerMessage);
VTABLE_set_string_native(interp, message, messagetype);
message = VTABLE_share_ro(interp, message);
#if CX_DEBUG
fprintf(stderr, "sending message[interp=%p]\n", interp);
#endif
#if CX_DEBUG
fprintf(stderr, "locking msg_lock (send) [interp=%p]\n", interp);
#endif
LOCK(sched_struct->msg_lock);
VTABLE_push_pmc(interp, sched_struct->messages, message);
#if CX_DEBUG
fprintf(stderr, "unlocking msg_lock (send) [interp=%p]\n", interp);
#endif
UNLOCK(sched_struct->msg_lock);
Parrot_cx_runloop_wake(interp, interp->scheduler);
}
}
/*
=item C<void Parrot_cx_broadcast_message(PARROT_INTERP, STRING *messagetype, PMC
*data)>
Send a message to the schedulers in all interpreters/threads linked to this
one.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_broadcast_message(PARROT_INTERP, ARGIN(STRING *messagetype), ARGIN_NULLOK(PMC *data))
{
ASSERT_ARGS(Parrot_cx_broadcast_message)
UINTVAL i;
LOCK(interpreter_array_mutex);
for (i = 0; i < n_interpreters; ++i) {
Parrot_Interp other_interp = interpreter_array[i];
if (interp == other_interp)
continue;
Parrot_cx_send_message(other_interp, messagetype, data);
}
UNLOCK(interpreter_array_mutex);
}
/*
=back
=head2 Task Interface Functions
Functions that are used to interface with a specific task in the concurrency scheduler.
=over 4
=item C<PMC * Parrot_cx_find_handler_for_task(PARROT_INTERP, PMC *task)>
Retrieve a handler appropriate to a given task. If the scheduler has no
appropriate handler, returns PMCNULL.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_find_handler_for_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_find_handler_for_task)
PMC *handler = PMCNULL;
#if CX_DEBUG
fprintf(stderr, "searching for handler\n");
#endif
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "find_handler"), "P->P", task, &handler);
#if CX_DEBUG
fprintf(stderr, "done searching for handler\n");
#endif
return handler;
}
/*
=item C<PMC * Parrot_cx_find_handler_local(PARROT_INTERP, PMC *task)>
Retrieve a handler appropriate to a given task from the local context. If the
context has no appropriate handler, returns PMCNULL.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_find_handler_local(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_find_handler_local)
/*
* Quick&dirty way to avoid infinite recursion
* when an exception is thrown while looking
* for a handler
*/
static int already_doing = 0;
static PMC * keep_context = NULL;
PMC *context;
PMC *iter = PMCNULL;
STRING * const handled_str = CONST_STRING(interp, "handled");
STRING * const iter_str = CONST_STRING(interp, "handler_iter");
if (already_doing) {
Parrot_io_eprintf(interp,
"** Exception caught while looking for a handler, trying next **\n");
if (! keep_context)
return NULL;
/*
* Note that we are now trying to handle the new exception,
* not the initial task argument (exception or whatever).
*/
context = Parrot_pcc_get_caller_ctx(interp, keep_context);
keep_context = NULL;
if (context && !PMC_IS_NULL(Parrot_pcc_get_handlers(interp, context)))
iter = VTABLE_get_iter(interp, Parrot_pcc_get_handlers(interp, context));
else
iter = PMCNULL;
}
else {
++already_doing;
/* Exceptions store the handler iterator for rethrow, other kinds of
* tasks don't (though they could). */
if (task->vtable->base_type == enum_class_Exception
&& VTABLE_get_integer_keyed_str(interp, task, handled_str) == -1) {
iter = VTABLE_get_attr_str(interp, task, iter_str);
context = (PMC *)VTABLE_get_pointer(interp, task);
}
else {
context = CURRENT_CONTEXT(interp);
if (!PMC_IS_NULL(Parrot_pcc_get_handlers(interp, context)))
iter = VTABLE_get_iter(interp, Parrot_pcc_get_handlers(interp, context));
}
}
while (context) {
keep_context = context;
/* Loop from newest handler to oldest handler. */
while (!PMC_IS_NULL(iter) && VTABLE_get_bool(interp, iter)) {
PMC * const handler = VTABLE_shift_pmc(interp, iter);
if (!PMC_IS_NULL(handler)) {
INTVAL valid_handler = 0;
if (handler->vtable->base_type == enum_class_Object)
Parrot_pcc_invoke_method_from_c_args(interp, handler, CONST_STRING(interp, "can_handle"),
"P->I", task, &valid_handler);
else
Parrot_pcc_invoke_method_from_c_args(interp, handler, CONST_STRING(interp, "can_handle"),
"P->I", task, &valid_handler);
if (valid_handler) {
if (task->vtable->base_type == enum_class_Exception) {
/* Store iterator and context for a later rethrow. */
VTABLE_set_attr_str(interp, task, CONST_STRING(interp, "handler_iter"), iter);
VTABLE_set_pointer(interp, task, context);
}
--already_doing;
keep_context = NULL;
return handler;
}
}
}
/* Continue the search in the next context up the chain. */
context = Parrot_pcc_get_caller_ctx(interp, context);
if (context && !PMC_IS_NULL(Parrot_pcc_get_handlers(interp, context)))
iter = VTABLE_get_iter(interp, Parrot_pcc_get_handlers(interp, context));
else
iter = PMCNULL;
}
/* Reached the end of the context chain without finding a handler. */
--already_doing;
return PMCNULL;
}
/*
=item C<void Parrot_cx_timer_invoke(PARROT_INTERP, PMC *timer)>
Run the associated code block for a timer event, when the timer fires.
=cut
*/
void
Parrot_cx_timer_invoke(PARROT_INTERP, ARGIN(PMC *timer))
{
ASSERT_ARGS(Parrot_cx_timer_invoke)
Parrot_Timer_attributes * const timer_struct = PARROT_TIMER(timer);
#if CX_DEBUG
fprintf(stderr, "current timer time: %f, %f\n",
timer_struct->birthtime + timer_struct->duration,
Parrot_floatval_time());
#endif
if (!PMC_IS_NULL(timer_struct->codeblock)) {
Parrot_pcc_invoke_sub_from_c_args(interp,
timer_struct->codeblock, "->");
}
}
/*
=item C<void Parrot_cx_invoke_callback(PARROT_INTERP, PMC *callback)>
Run the associated code block for a callback event.
=cut
*/
void
Parrot_cx_invoke_callback(PARROT_INTERP, ARGIN(PMC *callback))
{
ASSERT_ARGS(Parrot_cx_invoke_callback)
Parrot_Task_attributes * const task_struct = PARROT_TASK(callback);
if (!PMC_IS_NULL(task_struct->data)) {
Parrot_run_callback(interp, task_struct->data,
task_struct->cb_data);
}
}
/*
=back
=head2 Opcode Functions
Functions that are called from within opcodes, that take and return an
opcode_t* to allow for changing the code flow.
=over 4
=item C<opcode_t * Parrot_cx_schedule_sleep(PARROT_INTERP, FLOATVAL time,
opcode_t *next)>
Add a sleep timer to the scheduler. This function is called by the C<sleep>
opcode.
=cut