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Revision 1.338 by root, Tue Nov 23 04:45:59 2010 UTC vs.
Revision 1.354 by root, Thu Aug 11 21:26:39 2011 UTC

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85that isn't them. What's worse, all the potential users of your 85that isn't them. What's worse, all the potential users of your
86module are I<also> forced to use the same event loop you use. 86module are I<also> forced to use the same event loop you use.
87 87
88AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works 88AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works
89fine. AnyEvent + Tk works fine etc. etc. but none of these work together 89fine. AnyEvent + Tk works fine etc. etc. but none of these work together
90with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if 90with the rest: POE + EV? No go. Tk + Event? No go. Again: if your module
91your module uses one of those, every user of your module has to use it, 91uses one of those, every user of your module has to use it, too. But if
92too. But if your module uses AnyEvent, it works transparently with all 92your module uses AnyEvent, it works transparently with all event models it
93event models it supports (including stuff like IO::Async, as long as those 93supports (including stuff like IO::Async, as long as those use one of the
94use one of the supported event loops. It is easy to add new event loops 94supported event loops. It is easy to add new event loops to AnyEvent, too,
95to AnyEvent, too, so it is future-proof). 95so it is future-proof).
96 96
97In addition to being free of having to use I<the one and only true event 97In addition to being free of having to use I<the one and only true event
98model>, AnyEvent also is free of bloat and policy: with POE or similar 98model>, AnyEvent also is free of bloat and policy: with POE or similar
99modules, you get an enormous amount of code and strict rules you have to 99modules, you get an enormous amount of code and strict rules you have to
100follow. AnyEvent, on the other hand, is lean and to the point, by only 100follow. AnyEvent, on the other hand, is lean and to the point, by only
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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
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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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876 AnyEvent::Impl::Glib based on Glib, slow but very stable. 876 AnyEvent::Impl::Glib based on Glib, slow but very stable.
877 AnyEvent::Impl::Tk based on Tk, very broken. 877 AnyEvent::Impl::Tk based on Tk, very broken.
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.
882 AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883 AnyEvent::Impl::FLTK based on FLTK.
881 884
882=item Backends with special needs. 885=item Backends with special needs.
883 886
884Qt requires the Qt::Application to be instantiated first, but will 887Qt requires the Qt::Application to be instantiated first, but will
885otherwise be picked up automatically. As long as the main program 888otherwise be picked up automatically. As long as the main program
886instantiates the application before any AnyEvent watchers are created, 889instantiates the application before any AnyEvent watchers are created,
887everything should just work. 890everything should just work.
888 891
889 AnyEvent::Impl::Qt based on Qt. 892 AnyEvent::Impl::Qt based on Qt.
890
891Support for IO::Async can only be partial, as it is too broken and
892architecturally limited to even support the AnyEvent API. It also
893is the only event loop that needs the loop to be set explicitly, so
894it can only be used by a main program knowing about AnyEvent. See
895L<AnyEvent::Impl::IOAsync> for the gory details.
896
897 AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed.
898 893
899=item Event loops that are indirectly supported via other backends. 894=item Event loops that are indirectly supported via other backends.
900 895
901Some event loops can be supported via other modules: 896Some event loops can be supported via other modules:
902 897
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1010 # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent 1005 # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
1011 # as soon as it is 1006 # as soon as it is
1012 push @AnyEvent::post_detect, sub { require Coro::AnyEvent }; 1007 push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
1013 } 1008 }
1014 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
1015=back 1050=back
1016 1051
1017=head1 WHAT TO DO IN A MODULE 1052=head1 WHAT TO DO IN A MODULE
1018 1053
1019As 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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1052modules might create watchers when they are loaded, and AnyEvent will 1087modules might create watchers when they are loaded, and AnyEvent will
1053decide 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
1054might choose the wrong one unless you load the correct one yourself. 1089might choose the wrong one unless you load the correct one yourself.
1055 1090
1056You can chose to use a pure-perl implementation by loading the 1091You can chose to use a pure-perl implementation by loading the
1057C<AnyEvent::Impl::Perl> module, which gives you similar behaviour 1092C<AnyEvent::Loop> module, which gives you similar behaviour
1058everywhere, but letting AnyEvent chose the model is generally better. 1093everywhere, but letting AnyEvent chose the model is generally better.
1059 1094
1060=head2 MAINLOOP EMULATION 1095=head2 MAINLOOP EMULATION
1061 1096
1062Sometimes (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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1157 1192
1158package AnyEvent; 1193package AnyEvent;
1159 1194
1160# basically a tuned-down version of common::sense 1195# basically a tuned-down version of common::sense
1161sub common_sense { 1196sub common_sense {
1162 # from common:.sense 3.3 1197 # from common:.sense 3.4
1163 ${^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";
1164 # 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)
1165 $^H |= 0x00000600; 1200 $^H |= 0x00000600;
1166} 1201}
1167 1202
1168BEGIN { AnyEvent::common_sense } 1203BEGIN { AnyEvent::common_sense }
1169 1204
1170use Carp (); 1205use Carp ();
1171 1206
1172our $VERSION = '5.29'; 1207our $VERSION = '5.34';
1173our $MODEL; 1208our $MODEL;
1174 1209
1175our $AUTOLOAD; 1210our $AUTOLOAD;
1176our @ISA; 1211our @ISA;
1177 1212
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1202 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; 1237 $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1203} 1238}
1204 1239
1205my @models = ( 1240my @models = (
1206 [EV:: => AnyEvent::Impl::EV:: , 1], 1241 [EV:: => AnyEvent::Impl::EV:: , 1],
1207 [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1], 1242 [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
1208 # everything below here will not (normally) be autoprobed 1243 # everything below here will not (normally) be autoprobed
1209 # as the pureperl backend should work everywhere 1244 # as the pure perl backend should work everywhere
1210 # and is usually faster 1245 # and is usually faster
1211 [Event:: => AnyEvent::Impl::Event::, 1], 1246 [Event:: => AnyEvent::Impl::Event::, 1],
1212 [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers 1247 [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1213 [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy 1248 [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1214 [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package 1249 [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1215 [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles 1250 [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1216 [Qt:: => AnyEvent::Impl::Qt::], # requires special main program 1251 [Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1217 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza 1252 [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1218 [Wx:: => AnyEvent::Impl::POE::], 1253 [Wx:: => AnyEvent::Impl::POE::],
1219 [Prima:: => AnyEvent::Impl::POE::], 1254 [Prima:: => AnyEvent::Impl::POE::],
1220 # IO::Async is just too broken - we would need workarounds for its
1221 # byzantine signal and broken child handling, among others.
1222 # IO::Async is rather hard to detect, as it doesn't have any
1223 # obvious default class.
1224 [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1225 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program 1255 [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::],
1226 [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program 1256 [Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1227 [AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program 1257 [FLTK:: => AnyEvent::Impl::FLTK::],
1228); 1258);
1229 1259
1230our %method = map +($_ => 1), 1260our %method = map +($_ => 1),
1231 qw(io timer time now now_update signal child idle condvar one_event DESTROY); 1261 qw(io timer time now now_update signal child idle condvar DESTROY);
1232 1262
1233our @post_detect; 1263our @post_detect;
1234 1264
1235sub post_detect(&) { 1265sub post_detect(&) {
1236 my ($cb) = @_; 1266 my ($cb) = @_;
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1307 for (qw(time signal child idle)) { 1337 for (qw(time signal child idle)) {
1308 undef &{"AnyEvent::Base::$_"} 1338 undef &{"AnyEvent::Base::$_"}
1309 if defined &{"$MODEL\::$_"}; 1339 if defined &{"$MODEL\::$_"};
1310 } 1340 }
1311 1341
1312 require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT}; 1342 if ($ENV{PERL_ANYEVENT_STRICT}) {
1343 eval { require AnyEvent::Strict };
1344 warn "AnyEvent: cannot load AnyEvent::Strict: $@"
1345 if $@ && $VERBOSE;
1346 }
1313 1347
1314 (shift @post_detect)->() while @post_detect; 1348 (shift @post_detect)->() while @post_detect;
1315 1349
1316 *post_detect = sub(&) { 1350 *post_detect = sub(&) {
1317 shift->(); 1351 shift->();
… …
1330 1364
1331 detect; 1365 detect;
1332 1366
1333 my $class = shift; 1367 my $class = shift;
1334 $class->$func (@_); 1368 $class->$func (@_);
1369}
1370
1371our $POSTPONE_W;
1372our @POSTPONE;
1373
1374sub _postpone_exec {
1375 undef $POSTPONE_W;
1376 (pop @POSTPONE)->()
1377 while @POSTPONE;
1378}
1379
1380sub postpone(&) {
1381 push @POSTPONE, shift;
1382
1383 $POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
1384
1385 ()
1335} 1386}
1336 1387
1337# utility function to dup a filehandle. this is used by many backends 1388# utility function to dup a filehandle. this is used by many backends
1338# to support binding more than one watcher per filehandle (they usually 1389# to support binding more than one watcher per filehandle (they usually
1339# allow only one watcher per fd, so we dup it to get a different one). 1390# allow only one watcher per fd, so we dup it to get a different one).
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1401} 1452}
1402 1453
1403sub time() { 1454sub time() {
1404 AnyEvent->time 1455 AnyEvent->time
1405} 1456}
1457
1458*postpone = \&AnyEvent::postpone;
1406 1459
1407package AnyEvent::Base; 1460package AnyEvent::Base;
1408 1461
1409# default implementations for many methods 1462# default implementations for many methods
1410 1463
… …
1429 1482
1430*now = \&time; 1483*now = \&time;
1431 1484
1432sub now_update { } 1485sub now_update { }
1433 1486
1487sub _poll {
1488 Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
1489}
1490
1434# default implementation for ->condvar 1491# default implementation for ->condvar
1492# in fact, the default should not be overwritten
1435 1493
1436sub condvar { 1494sub condvar {
1437 eval q{ # poor man's autoloading {} 1495 eval q{ # poor man's autoloading {}
1438 *condvar = sub { 1496 *condvar = sub {
1439 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" 1497 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
… …
1624# default implementation for ->child 1682# default implementation for ->child
1625 1683
1626our %PID_CB; 1684our %PID_CB;
1627our $CHLD_W; 1685our $CHLD_W;
1628our $CHLD_DELAY_W; 1686our $CHLD_DELAY_W;
1629our $WNOHANG;
1630 1687
1631# used by many Impl's 1688# used by many Impl's
1632sub _emit_childstatus($$) { 1689sub _emit_childstatus($$) {
1633 my (undef, $rpid, $rstatus) = @_; 1690 my (undef, $rpid, $rstatus) = @_;
1634 1691
… …
1641 eval q{ # poor man's autoloading {} 1698 eval q{ # poor man's autoloading {}
1642 *_sigchld = sub { 1699 *_sigchld = sub {
1643 my $pid; 1700 my $pid;
1644 1701
1645 AnyEvent->_emit_childstatus ($pid, $?) 1702 AnyEvent->_emit_childstatus ($pid, $?)
1646 while ($pid = waitpid -1, $WNOHANG) > 0; 1703 while ($pid = waitpid -1, WNOHANG) > 0;
1647 }; 1704 };
1648 1705
1649 *child = sub { 1706 *child = sub {
1650 my (undef, %arg) = @_; 1707 my (undef, %arg) = @_;
1651 1708
1652 defined (my $pid = $arg{pid} + 0) 1709 my $pid = $arg{pid};
1653 or Carp::croak "required option 'pid' is missing"; 1710 my $cb = $arg{cb};
1654 1711
1655 $PID_CB{$pid}{$arg{cb}} = $arg{cb}; 1712 $PID_CB{$pid}{$cb+0} = $cb;
1656
1657 # WNOHANG is almost cetrainly 1 everywhere
1658 $WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/
1659 ? 1
1660 : eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1;
1661 1713
1662 unless ($CHLD_W) { 1714 unless ($CHLD_W) {
1663 $CHLD_W = AE::signal CHLD => \&_sigchld; 1715 $CHLD_W = AE::signal CHLD => \&_sigchld;
1664 # child could be a zombie already, so make at least one round 1716 # child could be a zombie already, so make at least one round
1665 &_sigchld; 1717 &_sigchld;
1666 } 1718 }
1667 1719
1668 bless [$pid, $arg{cb}], "AnyEvent::Base::child" 1720 bless [$pid, $cb+0], "AnyEvent::Base::child"
1669 }; 1721 };
1670 1722
1671 *AnyEvent::Base::child::DESTROY = sub { 1723 *AnyEvent::Base::child::DESTROY = sub {
1672 my ($pid, $cb) = @{$_[0]}; 1724 my ($pid, $icb) = @{$_[0]};
1673 1725
1674 delete $PID_CB{$pid}{$cb}; 1726 delete $PID_CB{$pid}{$icb};
1675 delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; 1727 delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1676 1728
1677 undef $CHLD_W unless keys %PID_CB; 1729 undef $CHLD_W unless keys %PID_CB;
1678 }; 1730 };
1679 }; 1731 };
… …
1751 1803
1752sub _send { 1804sub _send {
1753 # nop 1805 # nop
1754} 1806}
1755 1807
1808sub _wait {
1809 AnyEvent->_poll until $_[0]{_ae_sent};
1810}
1811
1756sub send { 1812sub send {
1757 my $cv = shift; 1813 my $cv = shift;
1758 $cv->{_ae_sent} = [@_]; 1814 $cv->{_ae_sent} = [@_];
1759 (delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb}; 1815 (delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};
1760 $cv->_send; 1816 $cv->_send;
… …
1767 1823
1768sub ready { 1824sub ready {
1769 $_[0]{_ae_sent} 1825 $_[0]{_ae_sent}
1770} 1826}
1771 1827
1772sub _wait {
1773 $WAITING
1774 and !$_[0]{_ae_sent}
1775 and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
1776
1777 local $WAITING = 1;
1778 AnyEvent->one_event while !$_[0]{_ae_sent};
1779}
1780
1781sub recv { 1828sub recv {
1829 unless ($_[0]{_ae_sent}) {
1830 $WAITING
1831 and Carp::croak "AnyEvent::CondVar: recursive blocking wait attempted";
1832
1833 local $WAITING = 1;
1782 $_[0]->_wait; 1834 $_[0]->_wait;
1835 }
1783 1836
1784 Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak}; 1837 $_[0]{_ae_croak}
1785 wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0] 1838 and Carp::croak $_[0]{_ae_croak};
1839
1840 wantarray
1841 ? @{ $_[0]{_ae_sent} }
1842 : $_[0]{_ae_sent}[0]
1786} 1843}
1787 1844
1788sub cb { 1845sub cb {
1789 my $cv = shift; 1846 my $cv = shift;
1790 1847
… …
1806 &{ $_[0]{_ae_end_cb} || sub { $_[0]->send } }; 1863 &{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };
1807} 1864}
1808 1865
1809# undocumented/compatibility with pre-3.4 1866# undocumented/compatibility with pre-3.4
1810*broadcast = \&send; 1867*broadcast = \&send;
1811*wait = \&_wait; 1868*wait = \&recv;
1812 1869
1813=head1 ERROR AND EXCEPTION HANDLING 1870=head1 ERROR AND EXCEPTION HANDLING
1814 1871
1815In general, AnyEvent does not do any error handling - it relies on the 1872In general, AnyEvent does not do any error handling - it relies on the
1816caller to do that if required. The L<AnyEvent::Strict> module (see also 1873caller to do that if required. The L<AnyEvent::Strict> module (see also
… …
1879used as event model. If it fails to load AnyEvent will proceed with 1936used as event model. If it fails to load AnyEvent will proceed with
1880auto detection and -probing. 1937auto detection and -probing.
1881 1938
1882This functionality might change in future versions. 1939This functionality might change in future versions.
1883 1940
1884For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you 1941For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1885could start your program like this: 1942could start your program like this:
1886 1943
1887 PERL_ANYEVENT_MODEL=Perl perl ... 1944 PERL_ANYEVENT_MODEL=Perl perl ...
1888 1945
1889=item C<PERL_ANYEVENT_PROTOCOLS> 1946=item C<PERL_ANYEVENT_PROTOCOLS>
… …
2588 2645
2589=item L<Time::HiRes> 2646=item L<Time::HiRes>
2590 2647
2591This module is part of perl since release 5.008. It will be used when the 2648This module is part of perl since release 5.008. It will be used when the
2592chosen event library does not come with a timing source of its own. The 2649chosen event library does not come with a timing source of its own. The
2593pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to 2650pure-perl event loop (L<AnyEvent::Loop>) will additionally load it to
2594try to use a monotonic clock for timing stability. 2651try to use a monotonic clock for timing stability.
2595 2652
2596=back 2653=back
2597 2654
2598 2655
… …
2666 2723
2667FAQ: L<AnyEvent::FAQ>. 2724FAQ: L<AnyEvent::FAQ>.
2668 2725
2669Utility functions: L<AnyEvent::Util>. 2726Utility functions: L<AnyEvent::Util>.
2670 2727
2671Event modules: L<EV>, L<EV::Glib>, L<Glib::EV>, L<Event>, L<Glib::Event>, 2728Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>,
2672L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. 2729L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2673 2730
2674Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, 2731Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2675L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, 2732L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2676L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, 2733L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2677L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>. 2734L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.

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