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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.345 by root, Fri Dec 31 04:50:44 2010 UTC vs.
Revision 1.355 by root, Fri Aug 12 00:53:29 2011 UTC

… …
121The interface itself is vaguely similar, but not identical to the L<Event> 121The interface itself is vaguely similar, but not identical to the L<Event>
122module. 122module.
123 123
124During the first call of any watcher-creation method, the module tries 124During the first call of any watcher-creation method, the module tries
125to detect the currently loaded event loop by probing whether one of the 125to detect the currently loaded event loop by probing whether one of the
126following modules is already loaded: L<EV>, L<AnyEvent::Impl::Perl>, 126following modules is already loaded: L<EV>, L<AnyEvent::Loop>,
127L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. The first one 127L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. The first one
128found is used. If none are detected, the module tries to load the first 128found is used. If none are detected, the module tries to load the first
129four modules in the order given; but note that if L<EV> is not 129four modules in the order given; but note that if L<EV> is not
130available, the pure-perl L<AnyEvent::Impl::Perl> should always work, so 130available, the pure-perl L<AnyEvent::Loop> should always work, so
131the other two are not normally tried. 131the other two are not normally tried.
132 132
133Because AnyEvent first checks for modules that are already loaded, loading 133Because AnyEvent first checks for modules that are already loaded, loading
134an event model explicitly before first using AnyEvent will likely make 134an event model explicitly before first using AnyEvent will likely make
135that model the default. For example: 135that model the default. For example:
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142The I<likely> means that, if any module loads another event model and 142The I<likely> means that, if any module loads another event model and
143starts using it, all bets are off - this case should be very rare though, 143starts using it, all bets are off - this case should be very rare though,
144as very few modules hardcode event loops without announcing this very 144as very few modules hardcode event loops without announcing this very
145loudly. 145loudly.
146 146
147The pure-perl implementation of AnyEvent is called 147The pure-perl implementation of AnyEvent is called C<AnyEvent::Loop>. Like
148C<AnyEvent::Impl::Perl>. Like other event modules you can load it 148other event modules you can load it explicitly and enjoy the high
149explicitly and enjoy the high availability of that event loop :) 149availability of that event loop :)
150 150
151=head1 WATCHERS 151=head1 WATCHERS
152 152
153AnyEvent has the central concept of a I<watcher>, which is an object that 153AnyEvent has the central concept of a I<watcher>, which is an object that
154stores relevant data for each kind of event you are waiting for, such as 154stores relevant data for each kind of event you are waiting for, such as
… …
356difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into 356difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into
357account. 357account.
358 358
359=item AnyEvent->now_update 359=item AnyEvent->now_update
360 360
361Some event loops (such as L<EV> or L<AnyEvent::Impl::Perl>) cache 361Some event loops (such as L<EV> or L<AnyEvent::Loop>) cache the current
362the current time for each loop iteration (see the discussion of L<< 362time for each loop iteration (see the discussion of L<< AnyEvent->now >>,
363AnyEvent->now >>, above). 363above).
364 364
365When a callback runs for a long time (or when the process sleeps), then 365When a callback runs for a long time (or when the process sleeps), then
366this "current" time will differ substantially from the real time, which 366this "current" time will differ substantially from the real time, which
367might affect timers and time-outs. 367might affect timers and time-outs.
368 368
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482thing in an AnyEvent program, you I<have> to create at least one 482thing in an AnyEvent program, you I<have> to create at least one
483watcher before you C<fork> the child (alternatively, you can call 483watcher before you C<fork> the child (alternatively, you can call
484C<AnyEvent::detect>). 484C<AnyEvent::detect>).
485 485
486As most event loops do not support waiting for child events, they will be 486As most event loops do not support waiting for child events, they will be
487emulated by AnyEvent in most cases, in which the latency and race problems 487emulated by AnyEvent in most cases, in which case the latency and race
488mentioned in the description of signal watchers apply. 488problems mentioned in the description of signal watchers apply.
489 489
490Example: fork a process and wait for it 490Example: fork a process and wait for it
491 491
492 my $done = AnyEvent->condvar; 492 my $done = AnyEvent->condvar;
493 493
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860use. If EV is not installed, then AnyEvent will fall back to its own 860use. If EV is not installed, then AnyEvent will fall back to its own
861pure-perl implementation, which is available everywhere as it comes with 861pure-perl implementation, which is available everywhere as it comes with
862AnyEvent itself. 862AnyEvent itself.
863 863
864 AnyEvent::Impl::EV based on EV (interface to libev, best choice). 864 AnyEvent::Impl::EV based on EV (interface to libev, best choice).
865 AnyEvent::Impl::Perl pure-perl implementation, fast and portable. 865 AnyEvent::Impl::Perl pure-perl AnyEvent::Loop, fast and portable.
866 866
867=item Backends that are transparently being picked up when they are used. 867=item Backends that are transparently being picked up when they are used.
868 868
869These will be used if they are already loaded when the first watcher 869These will be used if they are already loaded when the first watcher
870is created, in which case it is assumed that the application is using 870is created, in which case it is assumed that the application is using
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878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse. 878 AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879 AnyEvent::Impl::POE based on POE, very slow, some limitations. 879 AnyEvent::Impl::POE based on POE, very slow, some limitations.
880 AnyEvent::Impl::Irssi used when running within irssi. 880 AnyEvent::Impl::Irssi used when running within irssi.
881 AnyEvent::Impl::IOAsync based on IO::Async. 881 AnyEvent::Impl::IOAsync based on IO::Async.
882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop. 882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883 AnyEvent::Impl::FLTK based on FLTK.
883 884
884=item Backends with special needs. 885=item Backends with special needs.
885 886
886Qt requires the Qt::Application to be instantiated first, but will 887Qt requires the Qt::Application to be instantiated first, but will
887otherwise be picked up automatically. As long as the main program 888otherwise be picked up automatically. As long as the main program
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1004 # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent 1005 # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
1005 # as soon as it is 1006 # as soon as it is
1006 push @AnyEvent::post_detect, sub { require Coro::AnyEvent }; 1007 push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
1007 } 1008 }
1008 1009
1010=item AnyEvent::postpone { BLOCK }
1011
1012Arranges for the block to be executed as soon as possible, but not before
1013the call itself returns. In practise, the block will be executed just
1014before the event loop polls for new events, or shortly afterwards.
1015
1016This function never returns anything (to make the C<return postpone { ...
1017}> idiom more useful.
1018
1019To understand the usefulness of this function, consider a function that
1020asynchronously does something for you and returns some transaction
1021object or guard to let you cancel the operation. For example,
1022C<AnyEvent::Socket::tcp_connect>:
1023
1024 # start a conenction attempt unless one is active
1025 $self->{connect_guard} ||= AnyEvent::Socket::tcp_connect "www.example.net", 80, sub {
1026 delete $self->{connect_guard};
1027 ...
1028 };
1029
1030Imagine that this function could instantly call the callback, for
1031example, because it detects an obvious error such as a negative port
1032number. Invoking the callback before the function returns causes problems
1033however: the callback will be called and will try to delete the guard
1034object. But since the function hasn't returned yet, there is nothing to
1035delete. When the function eventually returns it will assign the guard
1036object to C<< $self->{connect_guard} >>, where it will likely never be
1037deleted, so the program thinks it is still trying to connect.
1038
1039This is where C<AnyEvent::postpone> should be used. Instead of calling the
1040callback directly on error:
1041
1042 $cb->(undef), return # signal error to callback, BAD!
1043 if $some_error_condition;
1044
1045It should use C<postpone>:
1046
1047 AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
1048 if $some_error_condition;
1049
1009=back 1050=back
1010 1051
1011=head1 WHAT TO DO IN A MODULE 1052=head1 WHAT TO DO IN A MODULE
1012 1053
1013As a module author, you should C<use AnyEvent> and call AnyEvent methods 1054As a module author, you should C<use AnyEvent> and call AnyEvent methods
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1046modules might create watchers when they are loaded, and AnyEvent will 1087modules might create watchers when they are loaded, and AnyEvent will
1047decide on the event model to use as soon as it creates watchers, and it 1088decide on the event model to use as soon as it creates watchers, and it
1048might choose the wrong one unless you load the correct one yourself. 1089might choose the wrong one unless you load the correct one yourself.
1049 1090
1050You can chose to use a pure-perl implementation by loading the 1091You can chose to use a pure-perl implementation by loading the
1051C<AnyEvent::Impl::Perl> module, which gives you similar behaviour 1092C<AnyEvent::Loop> module, which gives you similar behaviour
1052everywhere, but letting AnyEvent chose the model is generally better. 1093everywhere, but letting AnyEvent chose the model is generally better.
1053 1094
1054=head2 MAINLOOP EMULATION 1095=head2 MAINLOOP EMULATION
1055 1096
1056Sometimes (often for short test scripts, or even standalone programs who 1097Sometimes (often for short test scripts, or even standalone programs who
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1151 1192
1152package AnyEvent; 1193package AnyEvent;
1153 1194
1154# basically a tuned-down version of common::sense 1195# basically a tuned-down version of common::sense
1155sub common_sense { 1196sub common_sense {
1156 # from common:.sense 3.3 1197 # from common:.sense 3.4
1157 ${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf3\x0f\xc0\xf0\xfc\x33\x00"; 1198 ${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf0\x0f\xc0\xf0\xfc\x33\x00";
1158 # use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl) 1199 # use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1159 $^H |= 0x00000600; 1200 $^H |= 0x00000600;
1160} 1201}
1161 1202
1162BEGIN { AnyEvent::common_sense } 1203BEGIN { AnyEvent::common_sense }
1163 1204
1164use Carp (); 1205use Carp ();
1165 1206
1166our $VERSION = '5.3'; 1207our $VERSION = '5.34';
1167our $MODEL; 1208our $MODEL;
1168 1209
1169our $AUTOLOAD; 1210our $AUTOLOAD;
1170our @ISA; 1211our @ISA;
1171 1212
… …
1194 $PROTOCOL{$_} = ++$idx 1235 $PROTOCOL{$_} = ++$idx
1195 for reverse split /\s*,\s*/, 1236 for reverse split /\s*,\s*/,
1196 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; 1237 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1197} 1238}
1198 1239
1240our @post_detect;
1241
1242sub post_detect(&) {
1243 my ($cb) = @_;
1244
1245 push @post_detect, $cb;
1246
1247 defined wantarray
1248 ? bless \$cb, "AnyEvent::Util::postdetect"
1249 : ()
1250}
1251
1252sub AnyEvent::Util::postdetect::DESTROY {
1253 @post_detect = grep $_ != ${$_[0]}, @post_detect;
1254}
1255
1256our $POSTPONE_W;
1257our @POSTPONE;
1258
1259sub _postpone_exec {
1260 undef $POSTPONE_W;
1261
1262 &{ shift @POSTPONE }
1263 while @POSTPONE;
1264}
1265
1266sub postpone(&) {
1267 push @POSTPONE, shift;
1268
1269 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
1270
1271 ()
1272}
1273
1199my @models = ( 1274our @models = (
1200 [EV:: => AnyEvent::Impl::EV:: , 1], 1275 [EV:: => AnyEvent::Impl::EV:: , 1],
1201 [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1], 1276 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
1202 # everything below here will not (normally) be autoprobed 1277 # everything below here will not (normally) be autoprobed
1203 # as the pureperl backend should work everywhere 1278 # as the pure perl backend should work everywhere
1204 # and is usually faster 1279 # and is usually faster
1205 [Event:: => AnyEvent::Impl::Event::, 1], 1280 [Event:: => AnyEvent::Impl::Event::, 1],
1206 [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers 1281 [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1207 [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy 1282 [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1208 [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package 1283 [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1209 [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles 1284 [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1210 [Qt:: => AnyEvent::Impl::Qt::], # requires special main program 1285 [Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1211 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1286 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1212 [Wx:: => AnyEvent::Impl::POE::], 1287 [Wx:: => AnyEvent::Impl::POE::],
1213 [Prima:: => AnyEvent::Impl::POE::], 1288 [Prima:: => AnyEvent::Impl::POE::],
1214 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], 1289 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1215 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::], 1290 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1291 [FLTK:: => AnyEvent::Impl::FLTK::],
1216); 1292);
1217 1293
1218our %method = map +($_ => 1), 1294our %method = map +($_ => 1),
1219 qw(io timer time now now_update signal child idle condvar one_event DESTROY); 1295 qw(io timer time now now_update signal child idle condvar DESTROY);
1220
1221our @post_detect;
1222
1223sub post_detect(&) {
1224 my ($cb) = @_;
1225
1226 push @post_detect, $cb;
1227
1228 defined wantarray
1229 ? bless \$cb, "AnyEvent::Util::postdetect"
1230 : ()
1231}
1232
1233sub AnyEvent::Util::postdetect::DESTROY {
1234 @post_detect = grep $_ != ${$_[0]}, @post_detect;
1235}
1236 1296
1237sub detect() { 1297sub detect() {
1238 # free some memory 1298 # free some memory
1239 *detect = sub () { $MODEL }; 1299 *detect = sub () { $MODEL };
1240 1300
1241 local $!; # for good measure 1301 local $!; # for good measure
1242 local $SIG{__DIE__}; 1302 local $SIG{__DIE__};
1243 1303
1244 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { 1304 if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1245 my $model = "AnyEvent::Impl::$1"; 1305 my $model = $1;
1306 $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1246 if (eval "require $model") { 1307 if (eval "require $model") {
1247 $MODEL = $model; 1308 $MODEL = $model;
1248 warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2; 1309 warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1249 } else { 1310 } else {
1250 warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; 1311 warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
… …
1283 $MODEL 1344 $MODEL
1284 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n"; 1345 or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n";
1285 } 1346 }
1286 } 1347 }
1287 1348
1288 @models = (); # free probe data 1349 # free memory only needed for probing
1350 undef @models;
1351 undef @REGISTRY;
1289 1352
1290 push @{"$MODEL\::ISA"}, "AnyEvent::Base"; 1353 push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1291 unshift @ISA, $MODEL; 1354 unshift @ISA, $MODEL;
1292 1355
1293 # now nuke some methods that are overridden by the backend. 1356 # now nuke some methods that are overridden by the backend.
1294 # SUPER is not allowed. 1357 # SUPER usage is not allowed in these.
1295 for (qw(time signal child idle)) { 1358 for (qw(time signal child idle)) {
1296 undef &{"AnyEvent::Base::$_"} 1359 undef &{"AnyEvent::Base::$_"}
1297 if defined &{"$MODEL\::$_"}; 1360 if defined &{"$MODEL\::$_"};
1298 } 1361 }
1299 1362
… …
1302 warn "AnyEvent: cannot load AnyEvent::Strict: $@" 1365 warn "AnyEvent: cannot load AnyEvent::Strict: $@"
1303 if $@ && $VERBOSE; 1366 if $@ && $VERBOSE;
1304 } 1367 }
1305 1368
1306 (shift @post_detect)->() while @post_detect; 1369 (shift @post_detect)->() while @post_detect;
1370 undef @post_detect;
1307 1371
1308 *post_detect = sub(&) { 1372 *post_detect = sub(&) {
1309 shift->(); 1373 shift->();
1310 1374
1311 undef 1375 undef
1312 }; 1376 };
1313 1377
1378 # recover a few more bytes
1379 postpone {
1380 undef &AUTOLOAD;
1381 };
1382
1314 $MODEL 1383 $MODEL
1315} 1384}
1385
1386our %method = map +($_ => 1),
1387 qw(io timer time now now_update signal child idle condvar DESTROY);
1316 1388
1317sub AUTOLOAD { 1389sub AUTOLOAD {
1318 (my $func = $AUTOLOAD) =~ s/.*://; 1390 (my $func = $AUTOLOAD) =~ s/.*://;
1319 1391
1320 $method{$func} 1392 $method{$func}
1321 or Carp::croak "$func: not a valid AnyEvent class method"; 1393 or Carp::croak "$func: not a valid AnyEvent class method";
1394
1395 # free some memory
1396 undef %method;
1322 1397
1323 detect; 1398 detect;
1324 1399
1325 my $class = shift; 1400 my $class = shift;
1326 $class->$func (@_); 1401 $class->$func (@_);
… …
1355 1430
1356package AE; 1431package AE;
1357 1432
1358our $VERSION = $AnyEvent::VERSION; 1433our $VERSION = $AnyEvent::VERSION;
1359 1434
1435
1436sub _reset() {
1437 eval q{
1360# fall back to the main API by default - backends and AnyEvent::Base 1438 # fall back to the main API by default - backends and AnyEvent::Base
1361# implementations can overwrite these. 1439 # implementations can overwrite these.
1362 1440
1363sub io($$$) { 1441 sub io($$$) {
1364 AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2]) 1442 AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1365} 1443 }
1366 1444
1367sub timer($$$) { 1445 sub timer($$$) {
1368 AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2]) 1446 AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
1369} 1447 }
1370 1448
1371sub signal($$) { 1449 sub signal($$) {
1372 AnyEvent->signal (signal => $_[0], cb => $_[1]) 1450 AnyEvent->signal (signal => $_[0], cb => $_[1])
1373} 1451 }
1374 1452
1375sub child($$) { 1453 sub child($$) {
1376 AnyEvent->child (pid => $_[0], cb => $_[1]) 1454 AnyEvent->child (pid => $_[0], cb => $_[1])
1377} 1455 }
1378 1456
1379sub idle($) { 1457 sub idle($) {
1380 AnyEvent->idle (cb => $_[0]) 1458 AnyEvent->idle (cb => $_[0])
1381} 1459 }
1382 1460
1383sub cv(;&) { 1461 sub cv(;&) {
1384 AnyEvent->condvar (@_ ? (cb => $_[0]) : ()) 1462 AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1385} 1463 }
1386 1464
1387sub now() { 1465 sub now() {
1388 AnyEvent->now 1466 AnyEvent->now
1389} 1467 }
1390 1468
1391sub now_update() { 1469 sub now_update() {
1392 AnyEvent->now_update 1470 AnyEvent->now_update
1393} 1471 }
1394 1472
1395sub time() { 1473 sub time() {
1396 AnyEvent->time 1474 AnyEvent->time
1475 }
1476
1477 *postpone = \&AnyEvent::postpone;
1478 };
1479 die if $@;
1397} 1480}
1481
1482BEGIN { _reset }
1398 1483
1399package AnyEvent::Base; 1484package AnyEvent::Base;
1400 1485
1401# default implementations for many methods 1486# default implementations for many methods
1402 1487
… …
1421 1506
1422*now = \&time; 1507*now = \&time;
1423 1508
1424sub now_update { } 1509sub now_update { }
1425 1510
1511sub _poll {
1512 Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
1513}
1514
1426# default implementation for ->condvar 1515# default implementation for ->condvar
1516# in fact, the default should not be overwritten
1427 1517
1428sub condvar { 1518sub condvar {
1429 eval q{ # poor man's autoloading {} 1519 eval q{ # poor man's autoloading {}
1430 *condvar = sub { 1520 *condvar = sub {
1431 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" 1521 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
… …
1601 : sysread $SIGPIPE_R, (my $dummy), 9; 1691 : sysread $SIGPIPE_R, (my $dummy), 9;
1602 1692
1603 while (%SIG_EV) { 1693 while (%SIG_EV) {
1604 for (keys %SIG_EV) { 1694 for (keys %SIG_EV) {
1605 delete $SIG_EV{$_}; 1695 delete $SIG_EV{$_};
1606 $_->() for values %{ $SIG_CB{$_} || {} }; 1696 &$_ for values %{ $SIG_CB{$_} || {} };
1607 } 1697 }
1608 } 1698 }
1609 }; 1699 };
1610 }; 1700 };
1611 die if $@; 1701 die if $@;
… …
1638 }; 1728 };
1639 1729
1640 *child = sub { 1730 *child = sub {
1641 my (undef, %arg) = @_; 1731 my (undef, %arg) = @_;
1642 1732
1643 defined (my $pid = $arg{pid} + 0) 1733 my $pid = $arg{pid};
1644 or Carp::croak "required option 'pid' is missing"; 1734 my $cb = $arg{cb};
1645 1735
1646 $PID_CB{$pid}{$arg{cb}} = $arg{cb}; 1736 $PID_CB{$pid}{$cb+0} = $cb;
1647 1737
1648 unless ($CHLD_W) { 1738 unless ($CHLD_W) {
1649 $CHLD_W = AE::signal CHLD => \&_sigchld; 1739 $CHLD_W = AE::signal CHLD => \&_sigchld;
1650 # child could be a zombie already, so make at least one round 1740 # child could be a zombie already, so make at least one round
1651 &_sigchld; 1741 &_sigchld;
1652 } 1742 }
1653 1743
1654 bless [$pid, $arg{cb}], "AnyEvent::Base::child" 1744 bless [$pid, $cb+0], "AnyEvent::Base::child"
1655 }; 1745 };
1656 1746
1657 *AnyEvent::Base::child::DESTROY = sub { 1747 *AnyEvent::Base::child::DESTROY = sub {
1658 my ($pid, $cb) = @{$_[0]}; 1748 my ($pid, $icb) = @{$_[0]};
1659 1749
1660 delete $PID_CB{$pid}{$cb}; 1750 delete $PID_CB{$pid}{$icb};
1661 delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; 1751 delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1662 1752
1663 undef $CHLD_W unless keys %PID_CB; 1753 undef $CHLD_W unless keys %PID_CB;
1664 }; 1754 };
1665 }; 1755 };
… …
1737 1827
1738sub _send { 1828sub _send {
1739 # nop 1829 # nop
1740} 1830}
1741 1831
1832sub _wait {
1833 AnyEvent->_poll until $_[0]{_ae_sent};
1834}
1835
1742sub send { 1836sub send {
1743 my $cv = shift; 1837 my $cv = shift;
1744 $cv->{_ae_sent} = [@_]; 1838 $cv->{_ae_sent} = [@_];
1745 (delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb}; 1839 (delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};
1746 $cv->_send; 1840 $cv->_send;
… …
1753 1847
1754sub ready { 1848sub ready {
1755 $_[0]{_ae_sent} 1849 $_[0]{_ae_sent}
1756} 1850}
1757 1851
1758sub _wait {
1759 $WAITING
1760 and !$_[0]{_ae_sent}
1761 and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
1762
1763 local $WAITING = 1;
1764 AnyEvent->one_event while !$_[0]{_ae_sent};
1765}
1766
1767sub recv { 1852sub recv {
1853 unless ($_[0]{_ae_sent}) {
1854 $WAITING
1855 and Carp::croak "AnyEvent::CondVar: recursive blocking wait attempted";
1856
1857 local $WAITING = 1;
1768 $_[0]->_wait; 1858 $_[0]->_wait;
1859 }
1769 1860
1770 Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak}; 1861 $_[0]{_ae_croak}
1771 wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0] 1862 and Carp::croak $_[0]{_ae_croak};
1863
1864 wantarray
1865 ? @{ $_[0]{_ae_sent} }
1866 : $_[0]{_ae_sent}[0]
1772} 1867}
1773 1868
1774sub cb { 1869sub cb {
1775 my $cv = shift; 1870 my $cv = shift;
1776 1871
… …
1792 &{ $_[0]{_ae_end_cb} || sub { $_[0]->send } }; 1887 &{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };
1793} 1888}
1794 1889
1795# undocumented/compatibility with pre-3.4 1890# undocumented/compatibility with pre-3.4
1796*broadcast = \&send; 1891*broadcast = \&send;
1797*wait = \&_wait; 1892*wait = \&recv;
1798 1893
1799=head1 ERROR AND EXCEPTION HANDLING 1894=head1 ERROR AND EXCEPTION HANDLING
1800 1895
1801In general, AnyEvent does not do any error handling - it relies on the 1896In general, AnyEvent does not do any error handling - it relies on the
1802caller to do that if required. The L<AnyEvent::Strict> module (see also 1897caller to do that if required. The L<AnyEvent::Strict> module (see also
… …
1857can be very useful, however. 1952can be very useful, however.
1858 1953
1859=item C<PERL_ANYEVENT_MODEL> 1954=item C<PERL_ANYEVENT_MODEL>
1860 1955
1861This can be used to specify the event model to be used by AnyEvent, before 1956This can be used to specify the event model to be used by AnyEvent, before
1862auto detection and -probing kicks in. It must be a string consisting 1957auto detection and -probing kicks in.
1863entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended 1958
1959It normally is a string consisting entirely of ASCII letters (e.g. C<EV>
1960or C<IOAsync>). The string C<AnyEvent::Impl::> gets prepended and the
1864and the resulting module name is loaded and if the load was successful, 1961resulting module name is loaded and - if the load was successful - used as
1865used as event model. If it fails to load AnyEvent will proceed with 1962event model backend. If it fails to load then AnyEvent will proceed with
1866auto detection and -probing. 1963auto detection and -probing.
1867 1964
1868This functionality might change in future versions. 1965If the string ends with C<::> instead (e.g. C<AnyEvent::Impl::EV::>) then
1966nothing gets prepended and the module name is used as-is (hint: C<::> at
1967the end of a string designates a module name and quotes it appropriately).
1869 1968
1870For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you 1969For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1871could start your program like this: 1970could start your program like this:
1872 1971
1873 PERL_ANYEVENT_MODEL=Perl perl ... 1972 PERL_ANYEVENT_MODEL=Perl perl ...
1874 1973
1875=item C<PERL_ANYEVENT_PROTOCOLS> 1974=item C<PERL_ANYEVENT_PROTOCOLS>
… …
2574 2673
2575=item L<Time::HiRes> 2674=item L<Time::HiRes>
2576 2675
2577This module is part of perl since release 5.008. It will be used when the 2676This module is part of perl since release 5.008. It will be used when the
2578chosen event library does not come with a timing source of its own. The 2677chosen event library does not come with a timing source of its own. The
2579pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to 2678pure-perl event loop (L<AnyEvent::Loop>) will additionally load it to
2580try to use a monotonic clock for timing stability. 2679try to use a monotonic clock for timing stability.
2581 2680
2582=back 2681=back
2583 2682
2584 2683
… …
2652 2751
2653FAQ: L<AnyEvent::FAQ>. 2752FAQ: L<AnyEvent::FAQ>.
2654 2753
2655Utility functions: L<AnyEvent::Util>. 2754Utility functions: L<AnyEvent::Util>.
2656 2755
2657Event modules: L<EV>, L<EV::Glib>, L<Glib::EV>, L<Event>, L<Glib::Event>, 2756Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>,
2658L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. 2757L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2659 2758
2660Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, 2759Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2661L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, 2760L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2662L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, 2761L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2663L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>. 2762L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.

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