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Comparing deliantra/server/lib/cf.pm (file contents):
Revision 1.31 by elmex, Mon Aug 14 04:22:04 2006 UTC vs.
Revision 1.45 by root, Sat Aug 26 23:36:32 2006 UTC

5use Storable; 5use Storable;
6use Opcode; 6use Opcode;
7use Safe; 7use Safe;
8use Safe::Hole; 8use Safe::Hole;
9 9
10use Time::HiRes;
10use Event; 11use Event;
11$Event::Eval = 1; # no idea why this is required, but it is 12$Event::Eval = 1; # no idea why this is required, but it is
12 13
13use strict; 14use strict;
14 15
15our %COMMAND; 16our %COMMAND = ();
16our @EVENT; 17our @EVENT;
17our %PROP_TYPE; 18our %PROP_TYPE;
18our %PROP_IDX; 19our %PROP_IDX;
19our $LIBDIR = maps_directory "perl"; 20our $LIBDIR = maps_directory "perl";
20 21
22our $TICK = MAX_TIME * 1e-6;
23our $TICK_WATCHER;
24our $NEXT_TICK;
25
21BEGIN { 26BEGIN {
22 @EVENT = map lc, @EVENT;
23
24 *CORE::GLOBAL::warn = sub { 27 *CORE::GLOBAL::warn = sub {
25 my $msg = join "", @_; 28 my $msg = join "", @_;
26 $msg .= "\n" 29 $msg .= "\n"
27 unless $msg =~ /\n$/; 30 unless $msg =~ /\n$/;
28 31
63prop_gen PLAYER_PROP => "cf::object::player"; 66prop_gen PLAYER_PROP => "cf::object::player";
64 67
65prop_gen MAP_PROP => "cf::map"; 68prop_gen MAP_PROP => "cf::map";
66prop_gen ARCH_PROP => "cf::arch"; 69prop_gen ARCH_PROP => "cf::arch";
67 70
68# guessed hierarchies
69
70@ext::cf::object::player::ISA = @cf::object::player::ISA = 'cf::object'; 71@safe::cf::object::player::ISA = @cf::object::player::ISA = 'cf::object';
71@ext::cf::object::map::ISA = @cf::object::map::ISA = 'cf::object';
72 72
73# we bless all objects into derived classes to force a method lookup 73# we bless all objects into (empty) derived classes to force a method lookup
74# within the Safe compartment. 74# within the Safe compartment.
75for my $pkg (qw(cf::object cf::object::map cf::object::player cf::player cf::map cf::party cf::region cf::arch)) { 75for my $pkg (qw(cf::object cf::object::player cf::player cf::map cf::party cf::region cf::arch)) {
76 no strict 'refs'; 76 no strict 'refs';
77 @{"ext::$pkg\::wrap::ISA"} = @{"$pkg\::wrap::ISA"} = $pkg; 77 @{"safe::$pkg\::wrap::ISA"} = @{"$pkg\::wrap::ISA"} = $pkg;
78} 78}
79 79
80$Event::DIED = sub { 80$Event::DIED = sub {
81 warn "error in event callback: @_"; 81 warn "error in event callback: @_";
82}; 82};
85my @exts; 85my @exts;
86my @hook; 86my @hook;
87my %command; 87my %command;
88my %extcmd; 88my %extcmd;
89 89
90#############################################################################
91# utility functions
92
93use JSON::Syck (); # TODO# replace by JSON::PC once working
94
95sub from_json($) {
96 $JSON::Syck::ImplicitUnicode = 1; # work around JSON::Syck bugs
97 JSON::Syck::Load $_[0]
98}
99
100sub to_json($) {
101 $JSON::Syck::ImplicitUnicode = 0; # work around JSON::Syck bugs
102 JSON::Syck::Dump $_[0]
103}
104
105#############################################################################
106# "new" plug-in system
107
108=item cf::object::attach ... # NYI
109
110=item cf::attach_global ...
111
112=item cf::attach_to_type $object_type, ...
113
114=item cf::attach_to_objects ...
115
116=item cf::attach_to_players ...
117
118=item cf::attach_to_maps ...
119
120=item cf:register_attachment $name, ...
121
122 prio => $number, # lower is earlier
123 on_xxx => \&cb,
124 package => package::,
125
126=cut
127
128# the following variables are defined in .xs and must not be re-created
129our @CB_GLOBAL = (); # registry for all global events
130our @CB_OBJECT = (); # all objects (should not be used except in emergency)
131our @CB_PLAYER = ();
132our @CB_TYPE = (); # registry for type (cf-object class) based events
133our @CB_MAP = ();
134
135my %attachment;
136
137sub _attach_cb($\%$$$) {
138 my ($registry, $undo, $event, $prio, $cb) = @_;
139
140 use sort 'stable';
141
142 $cb = [$prio, $cb];
143
144 @{$registry->[$event]} = sort
145 { $a->[0] cmp $b->[0] }
146 @{$registry->[$event] || []}, $cb;
147
148 push @{$undo->{cb}}, [$event, $cb];
149}
150
151# attach handles attaching event callbacks
152# the only thing the caller has to do is pass the correct
153# registry (== where the callback attaches to).
154sub _attach(\@$@) {
155 my ($registry, $klass, @arg) = @_;
156
157 my $prio = 0;
158
159 my %undo = (
160 registry => $registry,
161 cb => [],
162 );
163
164 my %cb_id = map +("on_" . lc $EVENT[$_][0], $_) , grep $EVENT[$_][1] == $klass, 0 .. $#EVENT;
165
166 while (@arg) {
167 my $type = shift @arg;
168
169 if ($type eq "prio") {
170 $prio = shift @arg;
171
172 } elsif ($type eq "package") {
173 my $pkg = shift @arg;
174
175 while (my ($name, $id) = each %cb_id) {
176 if (my $cb = $pkg->can ($name)) {
177 _attach_cb $registry, %undo, $id, $prio, $cb;
178 }
179 }
180
181 } elsif (exists $cb_id{$type}) {
182 _attach_cb $registry, %undo, $cb_id{$type}, $prio, shift @arg;
183
184 } elsif (ref $type) {
185 warn "attaching objects not supported, ignoring.\n";
186
187 } else {
188 shift @arg;
189 warn "attach argument '$type' not supported, ignoring.\n";
190 }
191 }
192
193 \%undo
194}
195
196sub cf::object::attach {
197 die;
198}
199
200sub attach_global {
201 _attach @CB_GLOBAL, KLASS_GLOBAL, @_
202}
203
204sub attach_to_type {
205 my $type = shift;
206
207 _attach @{$CB_TYPE[$type]}, KLASS_OBJECT, @_
208}
209
210sub attach_to_objects {
211 _attach @CB_OBJECT, KLASS_OBJECT, @_
212}
213
214sub attach_to_players {
215 _attach @CB_PLAYER, KLASS_PLAYER, @_
216}
217
218sub attach_to_maps {
219 _attach @CB_MAP, KLASS_MAP, @_
220}
221
222sub register_attachment {
223 my $name = shift;
224
225 $attachment{$name} = [@_];
226}
227
228our $override;
229our @invoke_results = (); # referenced from .xs code. TODO: play tricks with reify and mortals?
230
231sub override {
232 $override = 1;
233 @invoke_results = ();
234}
235
236sub do_invoke {
237 my $event = shift;
238 my $callbacks = shift;
239
240 @invoke_results = ();
241
242 local $override;
243
244 for (@$callbacks) {
245 eval { &{$_->[1]} };
246
247 if ($@) {
248 warn "$@";
249 warn "... while processing $EVENT[$event][0] event, skipping processing altogether.\n";
250 override;
251 }
252
253 return 1 if $override;
254 }
255
256 0
257}
258
259#############################################################################
260# object support
261
262sub instantiate {
263 my ($obj, $data) = @_;
264 my $registry = $obj->registry;
265
266 $data = from_json $data;
267
268 for (@$data) {
269 my ($pri, $name, @args) = @$_;
270
271 if (my $attach = $attachment{$name}) {
272 _attach @$registry, KLASS_OBJECT, @$attach;
273
274 if (my $cb = delete $registry->[EVENT_OBJECT_INSTANTIATE]) {
275 for (@$cb) {
276 eval { $_->[1]->($obj, @args); };
277 if ($@) {
278 warn "$@";
279 warn "... while processing '$name' instantiate with args <@args>\n";
280 }
281 }
282 }
283 } else {
284 warn "object uses attachment $name that is not available, postponing.\n";
285 }
286
287 push @{$obj->{_attachment}}, $name;
288 }
289}
290
291# basically do the same as instantiate, without calling instantiate
292sub reattach {
293 my ($obj) = @_;
294 my $registry = $obj->registry;
295
296 warn "reattach<@_, $_>\n";
297}
298
299attach_to_objects
300 prio => -1000000,
301 on_clone => sub {
302 my ($src, $dst) = @_;
303
304 @{$dst->registry} = @{$src->registry};
305 warn "registry clone ", join ":", @{$src->registry};#d#
306
307 %$dst = %$src;
308
309 $dst->{_attachment} = [@{ $src->{_attachment} }]
310 if exists $src->{_attachment};
311
312 warn "clone<@_>\n";#d#
313 },
314;
315
316#############################################################################
317# old plug-in events
318
90sub inject_event { 319sub inject_event {
91 my $extension = shift; 320 my $extension = shift;
92 my $event_code = shift; 321 my $event_code = shift;
93 322
94 my $cb = $hook[$event_code]{$extension} 323 my $cb = $hook[$event_code]{$extension}
136} 365}
137 366
138sub register { 367sub register {
139 my ($base, $pkg) = @_; 368 my ($base, $pkg) = @_;
140 369
141 for my $idx (0 .. $#EVENT) { 370 #TODO
142 if (my $ref = $pkg->can ("on_$EVENT[$idx]")) {
143 #warn "registering $EVENT[$idx] hook to '$pkg'\n";
144 $hook[$idx]{$base} = $ref;
145 }
146 }
147} 371}
148 372
149sub load_extension { 373sub load_extension {
150 my ($path) = @_; 374 my ($path) = @_;
151 375
152 $path =~ /([^\/\\]+)\.ext$/ or die "$path"; 376 $path =~ /([^\/\\]+)\.ext$/ or die "$path";
153 my $base = $1; 377 my $base = $1;
154 my $pkg = $1; 378 my $pkg = $1;
155 $pkg =~ s/[^[:word:]]/_/g; 379 $pkg =~ s/[^[:word:]]/_/g;
156 $pkg = "cf::ext::$pkg"; 380 $pkg = "ext::$pkg";
157 381
158 warn "loading '$path' into '$pkg'\n"; 382 warn "loading '$path' into '$pkg'\n";
159 383
160 open my $fh, "<:utf8", $path 384 open my $fh, "<:utf8", $path
161 or die "$path: $!"; 385 or die "$path: $!";
182 my ($pkg) = @_; 406 my ($pkg) = @_;
183 407
184 warn "removing extension $pkg\n"; 408 warn "removing extension $pkg\n";
185 409
186 # remove hooks 410 # remove hooks
411 #TODO
187 for my $idx (0 .. $#EVENT) { 412# for my $idx (0 .. $#PLUGIN_EVENT) {
188 delete $hook[$idx]{$pkg}; 413# delete $hook[$idx]{$pkg};
189 } 414# }
190 415
191 # remove commands 416 # remove commands
192 for my $name (keys %command) { 417 for my $name (keys %command) {
193 my @cb = grep $_->[2] ne $pkg, @{ $command{$name} }; 418 my @cb = grep $_->[2] ne $pkg, @{ $command{$name} };
194 419
204 # remove extcmds 429 # remove extcmds
205 for my $name (grep $extcmd{$_}[1] eq $pkg, keys %extcmd) { 430 for my $name (grep $extcmd{$_}[1] eq $pkg, keys %extcmd) {
206 delete $extcmd{$name}; 431 delete $extcmd{$name};
207 } 432 }
208 433
209 if (my $cb = $pkg->can ("on_unload")) { 434 if (my $cb = $pkg->can ("unload")) {
210 eval { 435 eval {
211 $cb->($pkg); 436 $cb->($pkg);
212 1 437 1
213 } or warn "$pkg unloaded, but with errors: $@"; 438 } or warn "$pkg unloaded, but with errors: $@";
214 } 439 }
226 1 451 1
227 } or warn "$ext not loaded: $@"; 452 } or warn "$ext not loaded: $@";
228 } 453 }
229} 454}
230 455
456sub _perl_reload(&) {
457 my ($msg) = @_;
458
459 $msg->("reloading...");
460
461 eval {
462 # 1. cancel all watchers
463 $_->cancel for Event::all_watchers;
464
465 # 2. unload all extensions
466 for (@exts) {
467 $msg->("unloading <$_>");
468 unload_extension $_;
469 }
470
471 # 3. unload all modules loaded from $LIBDIR
472 while (my ($k, $v) = each %INC) {
473 next unless $v =~ /^\Q$LIBDIR\E\/.*\.pm$/;
474
475 $msg->("removing <$k>");
476 delete $INC{$k};
477
478 $k =~ s/\.pm$//;
479 $k =~ s/\//::/g;
480
481 if (my $cb = $k->can ("unload_module")) {
482 $cb->();
483 }
484
485 Symbol::delete_package $k;
486 }
487
488 # 4. get rid of safe::, as good as possible
489 Symbol::delete_package "safe::$_"
490 for qw(cf::object cf::object::player cf::player cf::map cf::party cf::region);
491
492 # 5. remove register_script_function callbacks
493 # TODO
494
495 # 6. unload cf.pm "a bit"
496 delete $INC{"cf.pm"};
497
498 # don't, removes xs symbols, too,
499 # and global variables created in xs
500 #Symbol::delete_package __PACKAGE__;
501
502 # 7. reload cf.pm
503 $msg->("reloading cf.pm");
504 require cf;
505 };
506 $msg->($@) if $@;
507
508 $msg->("reloaded");
509};
510
511sub perl_reload() {
512 _perl_reload {
513 warn $_[0];
514 print "$_[0]\n";
515 };
516}
517
231register_command "perl-reload", 0, sub { 518register_command "perl-reload", 0, sub {
232 my ($who, $arg) = @_; 519 my ($who, $arg) = @_;
233 520
234 if ($who->flag (FLAG_WIZ)) { 521 if ($who->flag (FLAG_WIZ)) {
235 $who->message ("reloading..."); 522 _perl_reload {
236 523 warn $_[0];
237 warn "reloading...\n"; 524 $who->message ($_[0]);
238 eval {
239 # 1. cancel all watchers
240 $_->cancel for Event::all_watchers;
241
242 # 2. unload all extensions
243 for (@exts) {
244 $who->message ("unloading <$_>");
245 unload_extension $_;
246 }
247
248 # 3. unload all modules loaded from $LIBDIR
249 while (my ($k, $v) = each %INC) {
250 next unless $v =~ /^\Q$LIBDIR\E\/.*\.pm$/;
251
252 $who->message ("removing <$k>");
253 delete $INC{$k};
254
255 $k =~ s/\.pm$//;
256 $k =~ s/\//::/g;
257
258 if (my $cb = $k->can ("unload_module")) {
259 $cb->();
260 }
261
262 Symbol::delete_package $k;
263 }
264
265 # 4. get rid of ext::, as good as possible
266 Symbol::delete_package "ext::$_"
267 for qw(cf::object cf::object::map cf::object::player cf::player cf::map cf::party cf::region);
268
269 # 5. remove register_script_function callbacks
270 # TODO
271
272 # 6. unload cf.pm "a bit"
273 delete $INC{"cf.pm"};
274
275 # don't, removes xs symbols, too
276 #Symbol::delete_package __PACKAGE__;
277
278 # 7. reload cf.pm
279 $who->message ("reloading cf.pm");
280 require cf;
281 }; 525 };
282 warn $@ if $@;
283 $who->message ($@) if $@;
284 warn "reloaded\n";
285
286 $who->message ("reloaded");
287 } else {
288 $who->message ("Intruder Alert!");
289 } 526 }
290}; 527};
291
292#############################################################################
293# utility functions
294
295use JSON::Syck (); # TODO# replace by JSON::PC once working
296
297sub from_json($) {
298 $JSON::Syck::ImplicitUnicode = 1; # work around JSON::Syck bugs
299 JSON::Syck::Load $_[0]
300}
301
302sub to_json($) {
303 $JSON::Syck::ImplicitUnicode = 0; # work around JSON::Syck bugs
304 JSON::Syck::Dump $_[0]
305}
306 528
307############################################################################# 529#############################################################################
308# extcmd framework, basically convert ext <msg> 530# extcmd framework, basically convert ext <msg>
309# into pkg::->on_extcmd_arg1 (...) while shortcutting a few 531# into pkg::->on_extcmd_arg1 (...) while shortcutting a few
310 532
311sub on_extcmd { 533attach_to_players
534 on_extcmd => sub {
312 my ($pl, $buf) = @_; 535 my ($pl, $buf) = @_;
313 536
314 my $msg = eval { from_json $buf }; 537 my $msg = eval { from_json $buf };
315 538
316 if (ref $msg) { 539 if (ref $msg) {
317 if (my $cb = $extcmd{$msg->{msgtype}}) { 540 if (my $cb = $extcmd{$msg->{msgtype}}) {
318 if (my %reply = $cb->[0]->($pl, $msg)) { 541 if (my %reply = $cb->[0]->($pl, $msg)) {
319 $pl->ext_reply ($msg->{msgid}, %reply); 542 $pl->ext_reply ($msg->{msgid}, %reply);
543 }
320 } 544 }
545 } else {
546 warn "player " . ($pl->ob->name) . " sent unparseable ext message: <$buf>\n";
321 } 547 }
322 } else { 548
323 warn "player " . ($pl->ob->name) . " sent unparseable ext message: <$buf>\n"; 549 cf::override;
324 } 550 },
325 551;
326 1
327}
328 552
329############################################################################# 553#############################################################################
330# load/save/clean perl data associated with a map 554# load/save/clean perl data associated with a map
331 555
332*on_mapclean = sub { 556*cf::mapsupport::on_clean = sub {
333 my ($map) = @_; 557 my ($map) = @_;
334 558
335 my $path = $map->tmpname; 559 my $path = $map->tmpname;
336 defined $path or return; 560 defined $path or return;
337 561
338 unlink "$path.cfperl"; 562 unlink "$path.cfperl";
339}; 563};
340 564
341*on_mapin = 565*cf::mapsupport::on_swapin =
342*on_mapload = sub { 566*cf::mapsupport::on_load = sub {
343 my ($map) = @_; 567 my ($map) = @_;
344 568
345 my $path = $map->tmpname; 569 my $path = $map->tmpname;
346 $path = $map->path unless defined $path; 570 $path = $map->path unless defined $path;
347 571
354 or return; # too new 578 or return; # too new
355 579
356 $map->_set_obs ($data->{obs}); 580 $map->_set_obs ($data->{obs});
357}; 581};
358 582
359*on_mapout = sub { 583*cf::mapsupport::on_swapout = sub {
360 my ($map) = @_; 584 my ($map) = @_;
361 585
362 my $path = $map->tmpname; 586 my $path = $map->tmpname;
363 $path = $map->path unless defined $path; 587 $path = $map->path unless defined $path;
364 588
381 } else { 605 } else {
382 unlink "$path.cfperl"; 606 unlink "$path.cfperl";
383 } 607 }
384}; 608};
385 609
610attach_to_maps prio => -10000, package => cf::mapsupport::;
611
386############################################################################# 612#############################################################################
387# load/save perl data associated with player->ob objects 613# load/save perl data associated with player->ob objects
388 614
389*on_player_load = sub { 615sub all_objects(@) {
616 @_, map all_objects ($_->inv), @_
617}
618
619attach_to_players
620 on_load => sub {
390 my ($ob, $path) = @_; 621 my ($pl, $path) = @_;
391 622
392 for my $o ($ob, $ob->inv) { 623 for my $o (all_objects $pl->ob) {
393 if (my $value = $o->get_ob_key_value ("_perl_data")) { 624 if (my $value = $o->get_ob_key_value ("_perl_data")) {
394 $o->set_ob_key_value ("_perl_data"); 625 $o->set_ob_key_value ("_perl_data");
395 626
396 %$o = %{ Storable::thaw pack "H*", $value }; 627 %$o = %{ Storable::thaw pack "H*", $value };
628 }
397 } 629 }
398 } 630 },
399}; 631 on_save => sub {
400
401*on_player_save = sub {
402 my ($ob, $path) = @_; 632 my ($pl, $path) = @_;
403 633
404 $_->set_ob_key_value (_perl_data => unpack "H*", Storable::nfreeze $_) 634 $_->set_ob_key_value (_perl_data => unpack "H*", Storable::nfreeze $_)
405 for grep %$_, $ob, $ob->inv; 635 for grep %$_, all_objects $pl->ob;
406}; 636 },
637;
407 638
408############################################################################# 639#############################################################################
409# core extensions - in perl 640# core extensions - in perl
410 641
411=item cf::player::exists $login 642=item cf::player::exists $login
457} 688}
458 689
459############################################################################# 690#############################################################################
460# map scripting support 691# map scripting support
461 692
462our $safe = new Safe "ext"; 693our $safe = new Safe "safe";
463our $safe_hole = new Safe::Hole; 694our $safe_hole = new Safe::Hole;
464 695
465$SIG{FPE} = 'IGNORE'; 696$SIG{FPE} = 'IGNORE';
466 697
467$safe->permit_only (Opcode::opset qw(:base_core :base_mem :base_orig :base_math sort time)); 698$safe->permit_only (Opcode::opset qw(:base_core :base_mem :base_orig :base_math sort time));
473 ["cf::object::player" => qw(player)], 704 ["cf::object::player" => qw(player)],
474 ["cf::player" => qw(peaceful)], 705 ["cf::player" => qw(peaceful)],
475) { 706) {
476 no strict 'refs'; 707 no strict 'refs';
477 my ($pkg, @funs) = @$_; 708 my ($pkg, @funs) = @$_;
478 *{"ext::$pkg\::$_"} = $safe_hole->wrap (\&{"$pkg\::$_"}) 709 *{"safe::$pkg\::$_"} = $safe_hole->wrap (\&{"$pkg\::$_"})
479 for @funs; 710 for @funs;
480} 711}
481 712
482sub safe_eval($;@) { 713sub safe_eval($;@) {
483 my ($code, %vars) = @_; 714 my ($code, %vars) = @_;
485 my $qcode = $code; 716 my $qcode = $code;
486 $qcode =~ s/"/‟/g; # not allowed in #line filenames 717 $qcode =~ s/"/‟/g; # not allowed in #line filenames
487 $qcode =~ s/\n/\\n/g; 718 $qcode =~ s/\n/\\n/g;
488 719
489 local $_; 720 local $_;
490 local @ext::cf::_safe_eval_args = values %vars; 721 local @safe::cf::_safe_eval_args = values %vars;
491 722
492 $code = 723 my $eval =
493 "do {\n" 724 "do {\n"
494 . "my (" . (join ",", map "\$$_", keys %vars) . ") = \@cf::_safe_eval_args;\n" 725 . "my (" . (join ",", map "\$$_", keys %vars) . ") = \@cf::_safe_eval_args;\n"
495 . "#line 0 \"{$qcode}\"\n" 726 . "#line 0 \"{$qcode}\"\n"
496 . $code 727 . $code
497 . "\n}" 728 . "\n}"
498 ; 729 ;
499 730
500 sub_generation_inc; 731 sub_generation_inc;
501 my @res = wantarray ? $safe->reval ($code) : scalar $safe->reval ($code); 732 my @res = wantarray ? $safe->reval ($eval) : scalar $safe->reval ($eval);
502 sub_generation_inc; 733 sub_generation_inc;
734
735 if ($@) {
736 warn "$@";
737 warn "while executing safe code '$code'\n";
738 warn "with arguments " . (join " ", %vars) . "\n";
739 }
503 740
504 wantarray ? @res : $res[0] 741 wantarray ? @res : $res[0]
505} 742}
506 743
507sub register_script_function { 744sub register_script_function {
508 my ($fun, $cb) = @_; 745 my ($fun, $cb) = @_;
509 746
510 no strict 'refs'; 747 no strict 'refs';
511 *{"ext::$fun"} = $safe_hole->wrap ($cb); 748 *{"safe::$fun"} = $safe_hole->wrap ($cb);
749}
750
751#############################################################################
752# the server's main()
753
754sub main {
755 Event::loop;
512} 756}
513 757
514############################################################################# 758#############################################################################
515# initialisation 759# initialisation
516 760
518 762
519unshift @INC, $LIBDIR; 763unshift @INC, $LIBDIR;
520 764
521load_extensions; 765load_extensions;
522 766
767$TICK_WATCHER = Event->timer (
768 prio => 1,
769 at => $NEXT_TICK || 1,
770 cb => sub {
771 cf::server_tick; # one server iteration
772
773 my $NOW = Event::time;
774 $NEXT_TICK += $TICK;
775
776 # if we are delayed by four ticks, skip them all
777 $NEXT_TICK = $NOW if $NOW >= $NEXT_TICK + $TICK * 4;
778
779 $TICK_WATCHER->at ($NEXT_TICK);
780 $TICK_WATCHER->start;
781 },
782);
783
5231 7841
524 785

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