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Comparing deliantra/server/lib/cf.pm (file contents):
Revision 1.35 by root, Thu Aug 24 13:35:48 2006 UTC vs.
Revision 1.45 by root, Sat Aug 26 23:36:32 2006 UTC

11use Event; 11use Event;
12$Event::Eval = 1; # no idea why this is required, but it is 12$Event::Eval = 1; # no idea why this is required, but it is
13 13
14use strict; 14use strict;
15 15
16our %COMMAND; 16our %COMMAND = ();
17our @EVENT; 17our @EVENT;
18our %PROP_TYPE; 18our %PROP_TYPE;
19our %PROP_IDX; 19our %PROP_IDX;
20our $LIBDIR = maps_directory "perl"; 20our $LIBDIR = maps_directory "perl";
21 21
22our $TICK = MAX_TIME * 1e-6; 22our $TICK = MAX_TIME * 1e-6;
23our $TICK_WATCHER; 23our $TICK_WATCHER;
24our $NEXT_TICK; 24our $NEXT_TICK;
25 25
26BEGIN { 26BEGIN {
27 @EVENT = map lc, @EVENT;
28
29 *CORE::GLOBAL::warn = sub { 27 *CORE::GLOBAL::warn = sub {
30 my $msg = join "", @_; 28 my $msg = join "", @_;
31 $msg .= "\n" 29 $msg .= "\n"
32 unless $msg =~ /\n$/; 30 unless $msg =~ /\n$/;
33 31
68prop_gen PLAYER_PROP => "cf::object::player"; 66prop_gen PLAYER_PROP => "cf::object::player";
69 67
70prop_gen MAP_PROP => "cf::map"; 68prop_gen MAP_PROP => "cf::map";
71prop_gen ARCH_PROP => "cf::arch"; 69prop_gen ARCH_PROP => "cf::arch";
72 70
73# guessed hierarchies
74
75@ext::cf::object::player::ISA = @cf::object::player::ISA = 'cf::object'; 71@safe::cf::object::player::ISA = @cf::object::player::ISA = 'cf::object';
76@ext::cf::object::map::ISA = @cf::object::map::ISA = 'cf::object';
77 72
78# 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
79# within the Safe compartment. 74# within the Safe compartment.
80for my $pkg (qw(cf::object cf::object::map cf::object::player cf::player cf::map cf::party cf::region cf::arch)) { 75for my $pkg (qw(cf::object cf::object::player cf::player cf::map cf::party cf::region cf::arch)) {
81 no strict 'refs'; 76 no strict 'refs';
82 @{"ext::$pkg\::wrap::ISA"} = @{"$pkg\::wrap::ISA"} = $pkg; 77 @{"safe::$pkg\::wrap::ISA"} = @{"$pkg\::wrap::ISA"} = $pkg;
83} 78}
84 79
85$Event::DIED = sub { 80$Event::DIED = sub {
86 warn "error in event callback: @_"; 81 warn "error in event callback: @_";
87}; 82};
90my @exts; 85my @exts;
91my @hook; 86my @hook;
92my %command; 87my %command;
93my %extcmd; 88my %extcmd;
94 89
90#############################################################################
91# utility functions
92
93use JSON::Syck (); # TODO# replace by JSON::PC once working
94
95sub from_json($) {
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
95sub inject_event { 319sub inject_event {
96 my $extension = shift; 320 my $extension = shift;
97 my $event_code = shift; 321 my $event_code = shift;
98 322
99 my $cb = $hook[$event_code]{$extension} 323 my $cb = $hook[$event_code]{$extension}
141} 365}
142 366
143sub register { 367sub register {
144 my ($base, $pkg) = @_; 368 my ($base, $pkg) = @_;
145 369
146 for my $idx (0 .. $#EVENT) { 370 #TODO
147 if (my $ref = $pkg->can ("on_$EVENT[$idx]")) {
148 #warn "registering $EVENT[$idx] hook to '$pkg'\n";
149 $hook[$idx]{$base} = $ref;
150 }
151 }
152} 371}
153 372
154sub load_extension { 373sub load_extension {
155 my ($path) = @_; 374 my ($path) = @_;
156 375
157 $path =~ /([^\/\\]+)\.ext$/ or die "$path"; 376 $path =~ /([^\/\\]+)\.ext$/ or die "$path";
158 my $base = $1; 377 my $base = $1;
159 my $pkg = $1; 378 my $pkg = $1;
160 $pkg =~ s/[^[:word:]]/_/g; 379 $pkg =~ s/[^[:word:]]/_/g;
161 $pkg = "cf::ext::$pkg"; 380 $pkg = "ext::$pkg";
162 381
163 warn "loading '$path' into '$pkg'\n"; 382 warn "loading '$path' into '$pkg'\n";
164 383
165 open my $fh, "<:utf8", $path 384 open my $fh, "<:utf8", $path
166 or die "$path: $!"; 385 or die "$path: $!";
187 my ($pkg) = @_; 406 my ($pkg) = @_;
188 407
189 warn "removing extension $pkg\n"; 408 warn "removing extension $pkg\n";
190 409
191 # remove hooks 410 # remove hooks
411 #TODO
192 for my $idx (0 .. $#EVENT) { 412# for my $idx (0 .. $#PLUGIN_EVENT) {
193 delete $hook[$idx]{$pkg}; 413# delete $hook[$idx]{$pkg};
194 } 414# }
195 415
196 # remove commands 416 # remove commands
197 for my $name (keys %command) { 417 for my $name (keys %command) {
198 my @cb = grep $_->[2] ne $pkg, @{ $command{$name} }; 418 my @cb = grep $_->[2] ne $pkg, @{ $command{$name} };
199 419
209 # remove extcmds 429 # remove extcmds
210 for my $name (grep $extcmd{$_}[1] eq $pkg, keys %extcmd) { 430 for my $name (grep $extcmd{$_}[1] eq $pkg, keys %extcmd) {
211 delete $extcmd{$name}; 431 delete $extcmd{$name};
212 } 432 }
213 433
214 if (my $cb = $pkg->can ("on_unload")) { 434 if (my $cb = $pkg->can ("unload")) {
215 eval { 435 eval {
216 $cb->($pkg); 436 $cb->($pkg);
217 1 437 1
218 } or warn "$pkg unloaded, but with errors: $@"; 438 } or warn "$pkg unloaded, but with errors: $@";
219 } 439 }
231 1 451 1
232 } or warn "$ext not loaded: $@"; 452 } or warn "$ext not loaded: $@";
233 } 453 }
234} 454}
235 455
456sub _perl_reload(&) {
457 my ($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
236register_command "perl-reload", 0, sub { 518register_command "perl-reload", 0, sub {
237 my ($who, $arg) = @_; 519 my ($who, $arg) = @_;
238 520
239 if ($who->flag (FLAG_WIZ)) { 521 if ($who->flag (FLAG_WIZ)) {
240 $who->message ("reloading..."); 522 _perl_reload {
241 523 warn $_[0];
242 warn "reloading...\n"; 524 $who->message ($_[0]);
243 eval {
244 # 1. cancel all watchers
245 $_->cancel for Event::all_watchers;
246
247 # 2. unload all extensions
248 for (@exts) {
249 $who->message ("unloading <$_>");
250 unload_extension $_;
251 }
252
253 # 3. unload all modules loaded from $LIBDIR
254 while (my ($k, $v) = each %INC) {
255 next unless $v =~ /^\Q$LIBDIR\E\/.*\.pm$/;
256
257 $who->message ("removing <$k>");
258 delete $INC{$k};
259
260 $k =~ s/\.pm$//;
261 $k =~ s/\//::/g;
262
263 if (my $cb = $k->can ("unload_module")) {
264 $cb->();
265 }
266
267 Symbol::delete_package $k;
268 }
269
270 # 4. get rid of ext::, as good as possible
271 Symbol::delete_package "ext::$_"
272 for qw(cf::object cf::object::map cf::object::player cf::player cf::map cf::party cf::region);
273
274 # 5. remove register_script_function callbacks
275 # TODO
276
277 # 6. unload cf.pm "a bit"
278 delete $INC{"cf.pm"};
279
280 # don't, removes xs symbols, too
281 #Symbol::delete_package __PACKAGE__;
282
283 # 7. reload cf.pm
284 $who->message ("reloading cf.pm");
285 require cf;
286 }; 525 };
287 warn $@ if $@;
288 $who->message ($@) if $@;
289 warn "reloaded\n";
290
291 $who->message ("reloaded");
292 } else {
293 $who->message ("Intruder Alert!");
294 } 526 }
295}; 527};
296
297#############################################################################
298# utility functions
299
300use JSON::Syck (); # TODO# replace by JSON::PC once working
301
302sub from_json($) {
303 $JSON::Syck::ImplicitUnicode = 1; # work around JSON::Syck bugs
304 JSON::Syck::Load $_[0]
305}
306
307sub to_json($) {
308 $JSON::Syck::ImplicitUnicode = 0; # work around JSON::Syck bugs
309 JSON::Syck::Dump $_[0]
310}
311 528
312############################################################################# 529#############################################################################
313# extcmd framework, basically convert ext <msg> 530# extcmd framework, basically convert ext <msg>
314# into pkg::->on_extcmd_arg1 (...) while shortcutting a few 531# into pkg::->on_extcmd_arg1 (...) while shortcutting a few
315 532
316sub on_extcmd { 533attach_to_players
534 on_extcmd => sub {
317 my ($pl, $buf) = @_; 535 my ($pl, $buf) = @_;
318 536
319 my $msg = eval { from_json $buf }; 537 my $msg = eval { from_json $buf };
320 538
321 if (ref $msg) { 539 if (ref $msg) {
322 if (my $cb = $extcmd{$msg->{msgtype}}) { 540 if (my $cb = $extcmd{$msg->{msgtype}}) {
323 if (my %reply = $cb->[0]->($pl, $msg)) { 541 if (my %reply = $cb->[0]->($pl, $msg)) {
324 $pl->ext_reply ($msg->{msgid}, %reply); 542 $pl->ext_reply ($msg->{msgid}, %reply);
543 }
325 } 544 }
545 } else {
546 warn "player " . ($pl->ob->name) . " sent unparseable ext message: <$buf>\n";
326 } 547 }
327 } else { 548
328 warn "player " . ($pl->ob->name) . " sent unparseable ext message: <$buf>\n"; 549 cf::override;
329 } 550 },
330 551;
331 1
332}
333 552
334############################################################################# 553#############################################################################
335# load/save/clean perl data associated with a map 554# load/save/clean perl data associated with a map
336 555
337*on_mapclean = sub { 556*cf::mapsupport::on_clean = sub {
338 my ($map) = @_; 557 my ($map) = @_;
339 558
340 my $path = $map->tmpname; 559 my $path = $map->tmpname;
341 defined $path or return; 560 defined $path or return;
342 561
343 unlink "$path.cfperl"; 562 unlink "$path.cfperl";
344}; 563};
345 564
346*on_mapin = 565*cf::mapsupport::on_swapin =
347*on_mapload = sub { 566*cf::mapsupport::on_load = sub {
348 my ($map) = @_; 567 my ($map) = @_;
349 568
350 my $path = $map->tmpname; 569 my $path = $map->tmpname;
351 $path = $map->path unless defined $path; 570 $path = $map->path unless defined $path;
352 571
359 or return; # too new 578 or return; # too new
360 579
361 $map->_set_obs ($data->{obs}); 580 $map->_set_obs ($data->{obs});
362}; 581};
363 582
364*on_mapout = sub { 583*cf::mapsupport::on_swapout = sub {
365 my ($map) = @_; 584 my ($map) = @_;
366 585
367 my $path = $map->tmpname; 586 my $path = $map->tmpname;
368 $path = $map->path unless defined $path; 587 $path = $map->path unless defined $path;
369 588
386 } else { 605 } else {
387 unlink "$path.cfperl"; 606 unlink "$path.cfperl";
388 } 607 }
389}; 608};
390 609
610attach_to_maps prio => -10000, package => cf::mapsupport::;
611
391############################################################################# 612#############################################################################
392# load/save perl data associated with player->ob objects 613# load/save perl data associated with player->ob objects
393 614
394sub all_objects(@) { 615sub all_objects(@) {
395 @_, map all_objects ($_->inv), @_ 616 @_, map all_objects ($_->inv), @_
396} 617}
397 618
398*on_player_load = sub { 619attach_to_players
620 on_load => sub {
399 my ($ob, $path) = @_; 621 my ($pl, $path) = @_;
400 622
401 for my $o (all_objects $ob) { 623 for my $o (all_objects $pl->ob) {
402 if (my $value = $o->get_ob_key_value ("_perl_data")) { 624 if (my $value = $o->get_ob_key_value ("_perl_data")) {
403 $o->set_ob_key_value ("_perl_data"); 625 $o->set_ob_key_value ("_perl_data");
404 626
405 %$o = %{ Storable::thaw pack "H*", $value }; 627 %$o = %{ Storable::thaw pack "H*", $value };
628 }
406 } 629 }
407 } 630 },
408}; 631 on_save => sub {
409
410*on_player_save = sub {
411 my ($ob, $path) = @_; 632 my ($pl, $path) = @_;
412 633
413 $_->set_ob_key_value (_perl_data => unpack "H*", Storable::nfreeze $_) 634 $_->set_ob_key_value (_perl_data => unpack "H*", Storable::nfreeze $_)
414 for grep %$_, all_objects $ob; 635 for grep %$_, all_objects $pl->ob;
415}; 636 },
637;
416 638
417############################################################################# 639#############################################################################
418# core extensions - in perl 640# core extensions - in perl
419 641
420=item cf::player::exists $login 642=item cf::player::exists $login
466} 688}
467 689
468############################################################################# 690#############################################################################
469# map scripting support 691# map scripting support
470 692
471our $safe = new Safe "ext"; 693our $safe = new Safe "safe";
472our $safe_hole = new Safe::Hole; 694our $safe_hole = new Safe::Hole;
473 695
474$SIG{FPE} = 'IGNORE'; 696$SIG{FPE} = 'IGNORE';
475 697
476$safe->permit_only (Opcode::opset qw(:base_core :base_mem :base_orig :base_math sort time)); 698$safe->permit_only (Opcode::opset qw(:base_core :base_mem :base_orig :base_math sort time));
482 ["cf::object::player" => qw(player)], 704 ["cf::object::player" => qw(player)],
483 ["cf::player" => qw(peaceful)], 705 ["cf::player" => qw(peaceful)],
484) { 706) {
485 no strict 'refs'; 707 no strict 'refs';
486 my ($pkg, @funs) = @$_; 708 my ($pkg, @funs) = @$_;
487 *{"ext::$pkg\::$_"} = $safe_hole->wrap (\&{"$pkg\::$_"}) 709 *{"safe::$pkg\::$_"} = $safe_hole->wrap (\&{"$pkg\::$_"})
488 for @funs; 710 for @funs;
489} 711}
490 712
491sub safe_eval($;@) { 713sub safe_eval($;@) {
492 my ($code, %vars) = @_; 714 my ($code, %vars) = @_;
494 my $qcode = $code; 716 my $qcode = $code;
495 $qcode =~ s/"/‟/g; # not allowed in #line filenames 717 $qcode =~ s/"/‟/g; # not allowed in #line filenames
496 $qcode =~ s/\n/\\n/g; 718 $qcode =~ s/\n/\\n/g;
497 719
498 local $_; 720 local $_;
499 local @ext::cf::_safe_eval_args = values %vars; 721 local @safe::cf::_safe_eval_args = values %vars;
500 722
501 $code = 723 my $eval =
502 "do {\n" 724 "do {\n"
503 . "my (" . (join ",", map "\$$_", keys %vars) . ") = \@cf::_safe_eval_args;\n" 725 . "my (" . (join ",", map "\$$_", keys %vars) . ") = \@cf::_safe_eval_args;\n"
504 . "#line 0 \"{$qcode}\"\n" 726 . "#line 0 \"{$qcode}\"\n"
505 . $code 727 . $code
506 . "\n}" 728 . "\n}"
507 ; 729 ;
508 730
509 sub_generation_inc; 731 sub_generation_inc;
510 my @res = wantarray ? $safe->reval ($code) : scalar $safe->reval ($code); 732 my @res = wantarray ? $safe->reval ($eval) : scalar $safe->reval ($eval);
511 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 }
512 740
513 wantarray ? @res : $res[0] 741 wantarray ? @res : $res[0]
514} 742}
515 743
516sub register_script_function { 744sub register_script_function {
517 my ($fun, $cb) = @_; 745 my ($fun, $cb) = @_;
518 746
519 no strict 'refs'; 747 no strict 'refs';
520 *{"ext::$fun"} = $safe_hole->wrap ($cb); 748 *{"safe::$fun"} = $safe_hole->wrap ($cb);
521} 749}
522 750
523############################################################################# 751#############################################################################
524# the server's main() 752# the server's main()
525 753
526sub run { 754sub main {
527 Event::loop; 755 Event::loop;
528} 756}
529 757
530############################################################################# 758#############################################################################
531# initialisation 759# initialisation
543 cf::server_tick; # one server iteration 771 cf::server_tick; # one server iteration
544 772
545 my $NOW = Event::time; 773 my $NOW = Event::time;
546 $NEXT_TICK += $TICK; 774 $NEXT_TICK += $TICK;
547 775
548 # if we are delayed by > 0.25 second, skip ticks 776 # if we are delayed by four ticks, skip them all
549 $NEXT_TICK = $NOW if $NOW >= $NEXT_TICK + .25; 777 $NEXT_TICK = $NOW if $NOW >= $NEXT_TICK + $TICK * 4;
550 778
551 $TICK_WATCHER->at ($NEXT_TICK); 779 $TICK_WATCHER->at ($NEXT_TICK);
552 $TICK_WATCHER->start; 780 $TICK_WATCHER->start;
553 }, 781 },
554); 782);

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