-
Notifications
You must be signed in to change notification settings - Fork 2.9k
/
bif.c
5061 lines (4392 loc) · 124 KB
/
bif.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
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2013. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stddef.h> /* offsetof() */
#include "sys.h"
#include "erl_vm.h"
#include "erl_sys_driver.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "bif.h"
#include "big.h"
#include "dist.h"
#include "erl_version.h"
#include "erl_binary.h"
#include "beam_bp.h"
#include "erl_db_util.h"
#include "register.h"
#include "erl_thr_progress.h"
#define ERTS_PTAB_WANT_BIF_IMPL__
#include "erl_ptab.h"
#include "erl_bits.h"
static Export* flush_monitor_message_trap = NULL;
static Export* set_cpu_topology_trap = NULL;
static Export* await_proc_exit_trap = NULL;
static Export* await_port_send_result_trap = NULL;
Export* erts_format_cpu_topology_trap = NULL;
static Export *await_sched_wall_time_mod_trap;
static erts_smp_atomic32_t sched_wall_time;
#define DECL_AM(S) Eterm AM_ ## S = am_atom_put(#S, sizeof(#S) - 1)
/*
* The BIF's now follow, see the Erlang Manual for a description of what
* each individual BIF does.
*/
BIF_RETTYPE spawn_3(BIF_ALIST_3)
{
ErlSpawnOpts so;
Eterm pid;
so.flags = 0;
pid = erl_create_process(BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3, &so);
if (is_non_value(pid)) {
BIF_ERROR(BIF_P, so.error_code);
} else {
if (ERTS_USE_MODIFIED_TIMING()) {
BIF_TRAP2(erts_delay_trap, BIF_P, pid, ERTS_MODIFIED_TIMING_DELAY);
}
BIF_RET(pid);
}
}
/**********************************************************************/
/* Utility to add a new link between processes p and another internal
* process (rpid). Process p must be the currently executing process.
*/
static int insert_internal_link(Process* p, Eterm rpid)
{
Process *rp;
ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
ASSERT(is_internal_pid(rpid));
#ifdef ERTS_SMP
if (IS_TRACED(p)
&& (ERTS_TRACE_FLAGS(p) & (F_TRACE_SOL|F_TRACE_SOL1))) {
rp_locks = ERTS_PROC_LOCKS_ALL;
}
erts_smp_proc_lock(p, ERTS_PROC_LOCK_LINK);
#endif
/* get a pointer to the process struct of the linked process */
rp = erts_pid2proc_opt(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK,
rpid, rp_locks,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp) {
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
return 0;
}
if (p != rp) {
erts_add_link(&ERTS_P_LINKS(p), LINK_PID, rp->common.id);
erts_add_link(&ERTS_P_LINKS(rp), LINK_PID, p->common.id);
ASSERT(is_nil(ERTS_TRACER_PROC(p))
|| is_internal_pid(ERTS_TRACER_PROC(p))
|| is_internal_port(ERTS_TRACER_PROC(p)));
if (IS_TRACED(p)) {
if (ERTS_TRACE_FLAGS(p) & (F_TRACE_SOL|F_TRACE_SOL1)) {
ERTS_TRACE_FLAGS(rp) |= (ERTS_TRACE_FLAGS(p) & TRACEE_FLAGS);
ERTS_TRACER_PROC(rp) = ERTS_TRACER_PROC(p); /* maybe steal */
if (ERTS_TRACE_FLAGS(p) & F_TRACE_SOL1) { /* maybe override */
ERTS_TRACE_FLAGS(rp) &= ~(F_TRACE_SOL1 | F_TRACE_SOL);
ERTS_TRACE_FLAGS(p) &= ~(F_TRACE_SOL1 | F_TRACE_SOL);
}
}
}
}
if (IS_TRACED_FL(rp, F_TRACE_PROCS))
trace_proc(p, rp, am_getting_linked, p->common.id);
if (p == rp)
erts_smp_proc_unlock(p, rp_locks & ~ERTS_PROC_LOCK_MAIN);
else {
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
erts_smp_proc_unlock(rp, rp_locks);
}
return 1;
}
/* create a link to the process */
BIF_RETTYPE link_1(BIF_ALIST_1)
{
DistEntry *dep;
if (IS_TRACED_FL(BIF_P, F_TRACE_PROCS)) {
trace_proc(BIF_P, BIF_P, am_link, BIF_ARG_1);
}
/* check that the pid or port which is our argument is OK */
if (is_internal_pid(BIF_ARG_1)) {
if (insert_internal_link(BIF_P, BIF_ARG_1)) {
BIF_RET(am_true);
}
else {
goto res_no_proc;
}
}
if (is_internal_port(BIF_ARG_1)) {
int send_link_signal = 0;
Port *prt = erts_port_lookup(BIF_ARG_1, ERTS_PORT_SFLGS_INVALID_LOOKUP);
if (!prt) {
goto res_no_proc;
}
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK);
if (erts_add_link(&ERTS_P_LINKS(BIF_P), LINK_PID, BIF_ARG_1) >= 0)
send_link_signal = 1;
/* else: already linked */
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
if (send_link_signal) {
Eterm ref;
Eterm *refp = erts_port_synchronous_ops ? &ref : NULL;
switch (erts_port_link(BIF_P, prt, BIF_P->common.id, refp)) {
case ERTS_PORT_OP_DROPPED:
case ERTS_PORT_OP_BADARG:
goto res_no_proc;
case ERTS_PORT_OP_SCHEDULED:
if (refp) {
ASSERT(is_internal_ref(ref));
BIF_TRAP3(await_port_send_result_trap, BIF_P, ref, am_true, am_true);
}
default:
break;
}
}
BIF_RET(am_true);
}
else if (is_external_port(BIF_ARG_1)
&& external_port_dist_entry(BIF_ARG_1) == erts_this_dist_entry) {
goto res_no_proc;
}
if (is_external_pid(BIF_ARG_1)) {
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK);
/* We may earn time by checking first that we're not linked already */
if (erts_lookup_link(ERTS_P_LINKS(BIF_P), BIF_ARG_1) != NULL) {
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
BIF_RET(am_true);
}
else {
ErtsLink *lnk;
int code;
ErtsDSigData dsd;
dep = external_pid_dist_entry(BIF_ARG_1);
if (dep == erts_this_dist_entry) {
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
goto res_no_proc;
}
code = erts_dsig_prepare(&dsd, dep, BIF_P, ERTS_DSP_RLOCK, 0);
switch (code) {
case ERTS_DSIG_PREP_NOT_ALIVE:
/* Let the dlink trap handle it */
case ERTS_DSIG_PREP_NOT_CONNECTED:
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
BIF_TRAP1(dlink_trap, BIF_P, BIF_ARG_1);
case ERTS_DSIG_PREP_CONNECTED:
/* We are connected. Setup link and send link signal */
erts_smp_de_links_lock(dep);
erts_add_link(&ERTS_P_LINKS(BIF_P), LINK_PID, BIF_ARG_1);
lnk = erts_add_or_lookup_link(&(dep->nlinks),
LINK_PID,
BIF_P->common.id);
ASSERT(lnk != NULL);
erts_add_link(&ERTS_LINK_ROOT(lnk), LINK_PID, BIF_ARG_1);
erts_smp_de_links_unlock(dep);
erts_smp_de_runlock(dep);
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);
code = erts_dsig_send_link(&dsd, BIF_P->common.id, BIF_ARG_1);
if (code == ERTS_DSIG_SEND_YIELD)
ERTS_BIF_YIELD_RETURN(BIF_P, am_true);
BIF_RET(am_true);
default:
ASSERT(! "Invalid dsig prepare result");
BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
}
}
}
BIF_ERROR(BIF_P, BADARG);
res_no_proc: {
erts_aint32_t state = erts_smp_atomic32_read_nob(&BIF_P->state);
if (state & ERTS_PSFLG_TRAP_EXIT) {
ErtsProcLocks locks = ERTS_PROC_LOCK_MAIN;
erts_deliver_exit_message(BIF_ARG_1, BIF_P, &locks, am_noproc, NIL);
erts_smp_proc_unlock(BIF_P, ~ERTS_PROC_LOCK_MAIN & locks);
BIF_RET(am_true);
}
else
BIF_ERROR(BIF_P, EXC_NOPROC);
}
}
#define ERTS_DEMONITOR_FALSE 2
#define ERTS_DEMONITOR_TRUE 1
#define ERTS_DEMONITOR_BADARG 0
#define ERTS_DEMONITOR_YIELD_TRUE -1
#define ERTS_DEMONITOR_INTERNAL_ERROR -2
static int
remote_demonitor(Process *c_p, DistEntry *dep, Eterm ref, Eterm to)
{
ErtsDSigData dsd;
ErtsMonitor *dmon;
ErtsMonitor *mon;
int code;
int res;
#ifndef ERTS_SMP
int stale_mon = 0;
#endif
ERTS_SMP_LC_ASSERT((ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK)
== erts_proc_lc_my_proc_locks(c_p));
code = erts_dsig_prepare(&dsd, dep, c_p, ERTS_DSP_RLOCK, 0);
switch (code) {
case ERTS_DSIG_PREP_NOT_ALIVE:
case ERTS_DSIG_PREP_NOT_CONNECTED:
#ifndef ERTS_SMP
/* XXX Is this possible? Shouldn't this link
previously have been removed if the node
had previously been disconnected. */
ASSERT(0);
stale_mon = 1;
#endif
/*
* In the smp case this is possible if the node goes
* down just before the call to demonitor.
*/
if (dep) {
erts_smp_de_links_lock(dep);
dmon = erts_remove_monitor(&dep->monitors, ref);
erts_smp_de_links_unlock(dep);
if (dmon)
erts_destroy_monitor(dmon);
}
mon = erts_remove_monitor(&ERTS_P_MONITORS(c_p), ref);
erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_LINK);
res = ERTS_DEMONITOR_TRUE;
break;
case ERTS_DSIG_PREP_CONNECTED:
erts_smp_de_links_lock(dep);
mon = erts_remove_monitor(&ERTS_P_MONITORS(c_p), ref);
dmon = erts_remove_monitor(&dep->monitors, ref);
erts_smp_de_links_unlock(dep);
erts_smp_de_runlock(dep);
erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_LINK);
if (!dmon) {
#ifndef ERTS_SMP
/* XXX How is this possible? Shouldn't this link
previously have been removed when the distributed
end was removed. */
ASSERT(0);
stale_mon = 1;
#endif
/*
* This is possible when smp support is enabled.
* 'DOWN' message just arrived.
*/
res = ERTS_DEMONITOR_TRUE;
}
else {
/*
* Soft (no force) send, use ->data in dist slot
* monitor list since in case of monitor name
* the atom is stored there. Yield if necessary.
*/
code = erts_dsig_send_demonitor(&dsd,
c_p->common.id,
(mon->name != NIL
? mon->name
: mon->pid),
ref,
0);
res = (code == ERTS_DSIG_SEND_YIELD
? ERTS_DEMONITOR_YIELD_TRUE
: ERTS_DEMONITOR_TRUE);
erts_destroy_monitor(dmon);
}
break;
default:
ASSERT(! "Invalid dsig prepare result");
return ERTS_DEMONITOR_INTERNAL_ERROR;
}
#ifndef ERTS_SMP
if (stale_mon) {
erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf();
erts_dsprintf(dsbufp, "Stale process monitor %T to ", ref);
if (is_atom(to))
erts_dsprintf(dsbufp, "{%T, %T}", to, dep->sysname);
else
erts_dsprintf(dsbufp, "%T", to);
erts_dsprintf(dsbufp, " found\n");
erts_send_error_to_logger(c_p->group_leader, dsbufp);
}
#endif
/*
* We aren't allowed to destroy 'mon' until now, since 'to'
* may refer into 'mon' (external pid).
*/
ASSERT(mon); /* Since link lock wasn't released between
lookup and remove */
erts_destroy_monitor(mon);
ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(c_p));
return res;
}
static int demonitor(Process *c_p, Eterm ref)
{
ErtsMonitor *mon = NULL; /* The monitor entry to delete */
Process *rp; /* Local target process */
Eterm to = NIL; /* Monitor link traget */
DistEntry *dep = NULL; /* Target's distribution entry */
int deref_de = 0;
int res;
int unlock_link = 1;
erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_LINK);
if (is_not_internal_ref(ref)) {
res = ERTS_DEMONITOR_BADARG;
goto done; /* Cannot be this monitor's ref */
}
mon = erts_lookup_monitor(ERTS_P_MONITORS(c_p), ref);
if (!mon) {
res = ERTS_DEMONITOR_FALSE;
goto done;
}
if (mon->type != MON_ORIGIN) {
res = ERTS_DEMONITOR_BADARG;
goto done;
}
to = mon->pid;
if (is_atom(to)) {
/* Monitoring a name at node to */
ASSERT(is_node_name_atom(to));
dep = erts_sysname_to_connected_dist_entry(to);
ASSERT(dep != erts_this_dist_entry);
if (dep)
deref_de = 1;
} else {
ASSERT(is_pid(to));
dep = pid_dist_entry(to);
}
if (dep != erts_this_dist_entry) {
res = remote_demonitor(c_p, dep, ref, to);
/* remote_demonitor() unlocks link lock on c_p */
unlock_link = 0;
}
else { /* Local monitor */
if (deref_de) {
deref_de = 0;
erts_deref_dist_entry(dep);
}
dep = NULL;
rp = erts_pid2proc_opt(c_p,
ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK,
to,
ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
mon = erts_remove_monitor(&ERTS_P_MONITORS(c_p), ref);
#ifndef ERTS_SMP
ASSERT(mon);
#else
if (!mon)
res = ERTS_DEMONITOR_FALSE;
else
#endif
{
res = ERTS_DEMONITOR_TRUE;
erts_destroy_monitor(mon);
}
if (rp) {
ErtsMonitor *rmon;
rmon = erts_remove_monitor(&ERTS_P_MONITORS(rp), ref);
if (rp != c_p)
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
if (rmon != NULL)
erts_destroy_monitor(rmon);
}
else {
ERTS_SMP_ASSERT_IS_NOT_EXITING(c_p);
}
}
done:
if (unlock_link)
erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_LINK);
if (deref_de) {
ASSERT(dep);
erts_deref_dist_entry(dep);
}
ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(c_p));
return res;
}
BIF_RETTYPE demonitor_1(BIF_ALIST_1)
{
switch (demonitor(BIF_P, BIF_ARG_1)) {
case ERTS_DEMONITOR_FALSE:
case ERTS_DEMONITOR_TRUE:
BIF_RET(am_true);
case ERTS_DEMONITOR_YIELD_TRUE:
ERTS_BIF_YIELD_RETURN(BIF_P, am_true);
case ERTS_DEMONITOR_BADARG:
BIF_ERROR(BIF_P, BADARG);
case ERTS_DEMONITOR_INTERNAL_ERROR:
default:
ASSERT(! "demonitor(): internal error");
BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
}
}
BIF_RETTYPE demonitor_2(BIF_ALIST_2)
{
Eterm res = am_true;
int info = 0;
int flush = 0;
Eterm list = BIF_ARG_2;
while (is_list(list)) {
Eterm* consp = list_val(list);
switch (CAR(consp)) {
case am_flush:
flush = 1;
break;
case am_info:
info = 1;
break;
default:
goto badarg;
}
list = CDR(consp);
}
if (is_not_nil(list))
goto badarg;
switch (demonitor(BIF_P, BIF_ARG_1)) {
case ERTS_DEMONITOR_FALSE:
if (info)
res = am_false;
if (flush)
BIF_TRAP2(flush_monitor_message_trap, BIF_P, BIF_ARG_1, res);
case ERTS_DEMONITOR_TRUE:
BIF_RET(res);
case ERTS_DEMONITOR_YIELD_TRUE:
ERTS_BIF_YIELD_RETURN(BIF_P, am_true);
case ERTS_DEMONITOR_BADARG:
badarg:
BIF_ERROR(BIF_P, BADARG);
case ERTS_DEMONITOR_INTERNAL_ERROR:
default:
ASSERT(! "demonitor(): internal error");
BIF_ERROR(BIF_P, EXC_INTERNAL_ERROR);
}
}
/* Type must be atomic object! */
void
erts_queue_monitor_message(Process *p,
ErtsProcLocks *p_locksp,
Eterm ref,
Eterm type,
Eterm item,
Eterm reason)
{
Eterm tup;
Eterm* hp;
Eterm reason_copy, ref_copy, item_copy;
Uint reason_size, ref_size, item_size, heap_size;
ErlOffHeap *ohp;
ErlHeapFragment *bp;
reason_size = IS_CONST(reason) ? 0 : size_object(reason);
item_size = IS_CONST(item) ? 0 : size_object(item);
ref_size = size_object(ref);
heap_size = 6+reason_size+ref_size+item_size;
hp = erts_alloc_message_heap(heap_size,
&bp,
&ohp,
p,
p_locksp);
reason_copy = (IS_CONST(reason)
? reason
: copy_struct(reason, reason_size, &hp, ohp));
item_copy = (IS_CONST(item)
? item
: copy_struct(item, item_size, &hp, ohp));
ref_copy = copy_struct(ref, ref_size, &hp, ohp);
tup = TUPLE5(hp, am_DOWN, ref_copy, type, item_copy, reason_copy);
erts_queue_message(p, p_locksp, bp, tup, NIL
#ifdef USE_VM_PROBES
, NIL
#endif
);
}
static BIF_RETTYPE
local_pid_monitor(Process *p, Eterm target)
{
BIF_RETTYPE ret;
Eterm mon_ref;
Process *rp;
ErtsProcLocks p_locks = ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK;
mon_ref = erts_make_ref(p);
ERTS_BIF_PREP_RET(ret, mon_ref);
if (target == p->common.id) {
return ret;
}
erts_smp_proc_lock(p, ERTS_PROC_LOCK_LINK);
rp = erts_pid2proc_opt(p, p_locks,
target, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp) {
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
p_locks &= ~ERTS_PROC_LOCK_LINK;
erts_queue_monitor_message(p, &p_locks,
mon_ref, am_process, target, am_noproc);
}
else {
ASSERT(rp != p);
erts_add_monitor(&ERTS_P_MONITORS(p), MON_ORIGIN, mon_ref, target, NIL);
erts_add_monitor(&ERTS_P_MONITORS(rp), MON_TARGET, mon_ref, p->common.id, NIL);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
}
erts_smp_proc_unlock(p, p_locks & ~ERTS_PROC_LOCK_MAIN);
return ret;
}
static BIF_RETTYPE
local_name_monitor(Process *p, Eterm target_name)
{
BIF_RETTYPE ret;
Eterm mon_ref;
ErtsProcLocks p_locks = ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK;
Process *rp;
mon_ref = erts_make_ref(p);
ERTS_BIF_PREP_RET(ret, mon_ref);
erts_smp_proc_lock(p, ERTS_PROC_LOCK_LINK);
rp = erts_whereis_process(p, p_locks, target_name, ERTS_PROC_LOCK_LINK,
ERTS_P2P_FLG_ALLOW_OTHER_X);
if (!rp) {
DeclareTmpHeap(lhp,3,p);
Eterm item;
UseTmpHeap(3,p);
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
p_locks &= ~ERTS_PROC_LOCK_LINK;
item = TUPLE2(lhp, target_name, erts_this_dist_entry->sysname);
erts_queue_monitor_message(p, &p_locks,
mon_ref, am_process, item, am_noproc);
UnUseTmpHeap(3,p);
}
else if (rp != p) {
erts_add_monitor(&ERTS_P_MONITORS(p), MON_ORIGIN, mon_ref, rp->common.id,
target_name);
erts_add_monitor(&ERTS_P_MONITORS(rp), MON_TARGET, mon_ref, p->common.id,
target_name);
erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
}
erts_smp_proc_unlock(p, p_locks & ~ERTS_PROC_LOCK_MAIN);
return ret;
}
static BIF_RETTYPE
remote_monitor(Process *p, Eterm bifarg1, Eterm bifarg2,
DistEntry *dep, Eterm target, int byname)
{
ErtsDSigData dsd;
BIF_RETTYPE ret;
int code;
erts_smp_proc_lock(p, ERTS_PROC_LOCK_LINK);
code = erts_dsig_prepare(&dsd, dep, p, ERTS_DSP_RLOCK, 0);
switch (code) {
case ERTS_DSIG_PREP_NOT_ALIVE:
/* Let the dmonitor_p trap handle it */
case ERTS_DSIG_PREP_NOT_CONNECTED:
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
ERTS_BIF_PREP_TRAP2(ret, dmonitor_p_trap, p, bifarg1, bifarg2);
break;
case ERTS_DSIG_PREP_CONNECTED:
if (!(dep->flags & DFLAG_DIST_MONITOR)
|| (byname && !(dep->flags & DFLAG_DIST_MONITOR_NAME))) {
erts_smp_de_runlock(dep);
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
ERTS_BIF_PREP_ERROR(ret, p, BADARG);
}
else {
Eterm p_trgt, p_name, d_name, mon_ref;
mon_ref = erts_make_ref(p);
if (byname) {
p_trgt = dep->sysname;
p_name = target;
d_name = target;
}
else {
p_trgt = target;
p_name = NIL;
d_name = NIL;
}
erts_smp_de_links_lock(dep);
erts_add_monitor(&ERTS_P_MONITORS(p), MON_ORIGIN, mon_ref, p_trgt,
p_name);
erts_add_monitor(&(dep->monitors), MON_TARGET, mon_ref, p->common.id,
d_name);
erts_smp_de_links_unlock(dep);
erts_smp_de_runlock(dep);
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_LINK);
code = erts_dsig_send_monitor(&dsd, p->common.id, target, mon_ref);
if (code == ERTS_DSIG_SEND_YIELD)
ERTS_BIF_PREP_YIELD_RETURN(ret, p, mon_ref);
else
ERTS_BIF_PREP_RET(ret, mon_ref);
}
break;
default:
ASSERT(! "Invalid dsig prepare result");
ERTS_BIF_PREP_ERROR(ret, p, EXC_INTERNAL_ERROR);
break;
}
return ret;
}
BIF_RETTYPE monitor_2(BIF_ALIST_2)
{
Eterm target = BIF_ARG_2;
BIF_RETTYPE ret;
DistEntry *dep = NULL;
int deref_de = 0;
/* Only process monitors are implemented */
if (BIF_ARG_1 != am_process) {
goto error;
}
if (is_internal_pid(target)) {
local_pid:
ret = local_pid_monitor(BIF_P, target);
} else if (is_external_pid(target)) {
dep = external_pid_dist_entry(target);
if (dep == erts_this_dist_entry)
goto local_pid;
ret = remote_monitor(BIF_P, BIF_ARG_1, BIF_ARG_2, dep, target, 0);
} else if (is_atom(target)) {
ret = local_name_monitor(BIF_P, target);
} else if (is_tuple(target)) {
Eterm *tp = tuple_val(target);
Eterm remote_node;
Eterm name;
if (arityval(*tp) != 2)
goto error;
remote_node = tp[2];
name = tp[1];
if (!is_atom(remote_node) || !is_atom(name)) {
goto error;
}
if (!erts_is_alive && remote_node != am_Noname) {
goto error; /* Remote monitor from (this) undistributed node */
}
dep = erts_sysname_to_connected_dist_entry(remote_node);
if (dep == erts_this_dist_entry) {
deref_de = 1;
ret = local_name_monitor(BIF_P, name);
} else {
if (dep)
deref_de = 1;
ret = remote_monitor(BIF_P, BIF_ARG_1, BIF_ARG_2, dep, name, 1);
}
} else {
error:
ERTS_BIF_PREP_ERROR(ret, BIF_P, BADARG);
}
if (deref_de) {
deref_de = 0;
erts_deref_dist_entry(dep);
}
return ret;
}
/**********************************************************************/
/* this is a combination of the spawn and link BIFs */
BIF_RETTYPE spawn_link_3(BIF_ALIST_3)
{
ErlSpawnOpts so;
Eterm pid;
so.flags = SPO_LINK;
pid = erl_create_process(BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3, &so);
if (is_non_value(pid)) {
BIF_ERROR(BIF_P, so.error_code);
} else {
if (ERTS_USE_MODIFIED_TIMING()) {
BIF_TRAP2(erts_delay_trap, BIF_P, pid, ERTS_MODIFIED_TIMING_DELAY);
}
BIF_RET(pid);
}
}
/**********************************************************************/
BIF_RETTYPE spawn_opt_1(BIF_ALIST_1)
{
ErlSpawnOpts so;
Eterm pid;
Eterm* tp;
Eterm ap;
Eterm arg;
Eterm res;
/*
* Check that the first argument is a tuple of four elements.
*/
if (is_not_tuple(BIF_ARG_1)) {
error:
BIF_ERROR(BIF_P, BADARG);
}
tp = tuple_val(BIF_ARG_1);
if (*tp != make_arityval(4))
goto error;
/*
* Store default values for options.
*/
so.flags = SPO_USE_ARGS;
so.min_heap_size = H_MIN_SIZE;
so.min_vheap_size = BIN_VH_MIN_SIZE;
so.priority = PRIORITY_NORMAL;
so.max_gen_gcs = (Uint16) erts_smp_atomic32_read_nob(&erts_max_gen_gcs);
so.scheduler = 0;
/*
* Walk through the option list.
*/
ap = tp[4];
while (is_list(ap)) {
arg = CAR(list_val(ap));
if (arg == am_link) {
so.flags |= SPO_LINK;
} else if (arg == am_monitor) {
so.flags |= SPO_MONITOR;
} else if (is_tuple(arg)) {
Eterm* tp2 = tuple_val(arg);
Eterm val;
if (*tp2 != make_arityval(2))
goto error;
arg = tp2[1];
val = tp2[2];
if (arg == am_priority) {
if (val == am_max)
so.priority = PRIORITY_MAX;
else if (val == am_high)
so.priority = PRIORITY_HIGH;
else if (val == am_normal)
so.priority = PRIORITY_NORMAL;
else if (val == am_low)
so.priority = PRIORITY_LOW;
else
goto error;
} else if (arg == am_min_heap_size && is_small(val)) {
Sint min_heap_size = signed_val(val);
if (min_heap_size < 0) {
goto error;
} else if (min_heap_size < H_MIN_SIZE) {
so.min_heap_size = H_MIN_SIZE;
} else {
so.min_heap_size = erts_next_heap_size(min_heap_size, 0);
}
} else if (arg == am_min_bin_vheap_size && is_small(val)) {
Sint min_vheap_size = signed_val(val);
if (min_vheap_size < 0) {
goto error;
} else if (min_vheap_size < BIN_VH_MIN_SIZE) {
so.min_vheap_size = BIN_VH_MIN_SIZE;
} else {
so.min_vheap_size = erts_next_heap_size(min_vheap_size, 0);
}
} else if (arg == am_fullsweep_after && is_small(val)) {
Sint max_gen_gcs = signed_val(val);
if (max_gen_gcs < 0) {
goto error;
} else {
so.max_gen_gcs = max_gen_gcs;
}
} else if (arg == am_scheduler && is_small(val)) {
Sint scheduler = signed_val(val);
if (scheduler < 0 || erts_no_schedulers < scheduler)
goto error;
so.scheduler = (int) scheduler;
} else {
goto error;
}
} else {
goto error;
}
ap = CDR(list_val(ap));
}
if (is_not_nil(ap)) {
goto error;
}
/*
* Spawn the process.
*/
pid = erl_create_process(BIF_P, tp[1], tp[2], tp[3], &so);
if (is_non_value(pid)) {
BIF_ERROR(BIF_P, so.error_code);
} else if (so.flags & SPO_MONITOR) {
Eterm* hp = HAlloc(BIF_P, 3);
res = TUPLE2(hp, pid, so.mref);
} else {
res = pid;
}
if (ERTS_USE_MODIFIED_TIMING()) {
BIF_TRAP2(erts_delay_trap, BIF_P, res, ERTS_MODIFIED_TIMING_DELAY);
}
else {
BIF_RET(res);
}
}
/**********************************************************************/
/* remove a link from a process */
BIF_RETTYPE unlink_1(BIF_ALIST_1)
{
Process *rp;
DistEntry *dep;
ErtsLink *l = NULL, *rl = NULL;
/*
* SMP specific note concerning incoming exit signals:
* We have to have at least the status lock during removal of
* the link half on current process, and check for and handle
* a present pending exit while the status lock is held. This
* in order to ensure that we wont be exited by a link after
* it has been removed.
*
* (We also have to have the link lock, of course, in order to
* be allowed to remove the link...)
*/
if (IS_TRACED_FL(BIF_P, F_TRACE_PROCS)) {
trace_proc(BIF_P, BIF_P, am_unlink, BIF_ARG_1);
}
if (is_internal_port(BIF_ARG_1)) {
erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS);
#ifdef ERTS_SMP
if (ERTS_PROC_PENDING_EXIT(BIF_P))
goto handle_pending_exit;
#endif
l = erts_remove_link(&ERTS_P_LINKS(BIF_P), BIF_ARG_1);
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS);
if (l) {
Port *prt;
erts_destroy_link(l);
/* Send unlink signal */
prt = erts_port_lookup(BIF_ARG_1, ERTS_PORT_SFLGS_DEAD);
if (prt) {
ErtsPortOpResult res;
Eterm ref;
Eterm *refp = erts_port_synchronous_ops ? &ref : NULL;
#ifdef DEBUG
ref = NIL;
#endif
res = erts_port_unlink(BIF_P, prt, BIF_P->common.id, refp);
if (refp && res == ERTS_PORT_OP_SCHEDULED) {
ASSERT(is_internal_ref(ref));
BIF_TRAP3(await_port_send_result_trap, BIF_P, ref, am_true, am_true);
}
}
}
BIF_RET(am_true);
}
else if (is_external_port(BIF_ARG_1)
&& external_port_dist_entry(BIF_ARG_1) == erts_this_dist_entry) {
BIF_RET(am_true);