[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent.pm

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.269 by root, Fri Jul 31 20:16:29 2009 UTC vs.
Revision 1.329 by root, Sun Jul 11 05:44:22 2010 UTC

…		…
7		7
8	=head1 SYNOPSIS	8	=head1 SYNOPSIS
9		9
10	use AnyEvent;	10	use AnyEvent;
11		11
		12	# if you prefer function calls, look at the AE manpage for
		13	# an alternative API.
		14
12	# file descriptor readable	15	# file handle or descriptor readable
13	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });	16	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });
14		17
15	# one-shot or repeating timers	18	# one-shot or repeating timers
16	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });	19	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });
17	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...	20	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...
…		…
135	use AnyEvent;	138	use AnyEvent;
136		139
137	# .. AnyEvent will likely default to Tk	140	# .. AnyEvent will likely default to Tk
138		141
139	The I<likely> means that, if any module loads another event model and	142	The I<likely> means that, if any module loads another event model and
140	starts using it, all bets are off. Maybe you should tell their authors to	143	starts using it, all bets are off - this case should be very rare though,
141	use AnyEvent so their modules work together with others seamlessly...	144	as very few modules hardcode event loops without announcing this very
		145	loudly.
142		146
143	The pure-perl implementation of AnyEvent is called	147	The pure-perl implementation of AnyEvent is called
144	C<AnyEvent::Impl::Perl>. Like other event modules you can load it	148	C<AnyEvent::Impl::Perl>. Like other event modules you can load it
145	explicitly and enjoy the high availability of that event loop :)	149	explicitly and enjoy the high availability of that event loop :)
146		150
…		…
363	might affect timers and time-outs.	367	might affect timers and time-outs.
364		368
365	When this is the case, you can call this method, which will update the	369	When this is the case, you can call this method, which will update the
366	event loop's idea of "current time".	370	event loop's idea of "current time".
367		371
		372	A typical example would be a script in a web server (e.g. C<mod_perl>) -
		373	when mod_perl executes the script, then the event loop will have the wrong
		374	idea about the "current time" (being potentially far in the past, when the
		375	script ran the last time). In that case you should arrange a call to C<<
		376	AnyEvent->now_update >> each time the web server process wakes up again
		377	(e.g. at the start of your script, or in a handler).
		378
368	Note that updating the time I<might> cause some events to be handled.	379	Note that updating the time I<might> cause some events to be handled.
369		380
370	=back	381	=back
371		382
372	=head2 SIGNAL WATCHERS	383	=head2 SIGNAL WATCHERS
…		…
395	correctly.	406	correctly.
396		407
397	Example: exit on SIGINT	408	Example: exit on SIGINT
398		409
399	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	410	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		411
		412	=head3 Restart Behaviour
		413
		414	While restart behaviour is up to the event loop implementation, most will
		415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		416	pure perl implementation).
		417
		418	=head3 Safe/Unsafe Signals
		419
		420	Perl signals can be either "safe" (synchronous to opcode handling) or
		421	"unsafe" (asynchronous) - the former might get delayed indefinitely, the
		422	latter might corrupt your memory.
		423
		424	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		425	i.e. they will not interrupt your running perl program but will only be
		426	called as part of the normal event handling (just like timer, I/O etc.
		427	callbacks, too).
400		428
401	=head3 Signal Races, Delays and Workarounds	429	=head3 Signal Races, Delays and Workarounds
402		430
403	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
404	callbacks to signals in a generic way, which is a pity, as you cannot	432	callbacks to signals in a generic way, which is a pity, as you cannot
…		…
479		507
480	=head2 IDLE WATCHERS	508	=head2 IDLE WATCHERS
481		509
482	$w = AnyEvent->idle (cb => <callback>);	510	$w = AnyEvent->idle (cb => <callback>);
483		511
484	Sometimes there is a need to do something, but it is not so important	512	Repeatedly invoke the callback after the process becomes idle, until
485	to do it instantly, but only when there is nothing better to do. This	513	either the watcher is destroyed or new events have been detected.
486	"nothing better to do" is usually defined to be "no other events need
487	attention by the event loop".
488		514
489	Idle watchers ideally get invoked when the event loop has nothing	515	Idle watchers are useful when there is a need to do something, but it
490	better to do, just before it would block the process to wait for new	516	is not so important (or wise) to do it instantly. The callback will be
491	events. Instead of blocking, the idle watcher is invoked.	517	invoked only when there is "nothing better to do", which is usually
		518	defined as "all outstanding events have been handled and no new events
		519	have been detected". That means that idle watchers ideally get invoked
		520	when the event loop has just polled for new events but none have been
		521	detected. Instead of blocking to wait for more events, the idle watchers
		522	will be invoked.
492		523
493	Most event loops unfortunately do not really support idle watchers (only	524	Unfortunately, most event loops do not really support idle watchers (only
494	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	525	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
495	will simply call the callback "from time to time".	526	will simply call the callback "from time to time".
496		527
497	Example: read lines from STDIN, but only process them when the	528	Example: read lines from STDIN, but only process them when the
498	program is otherwise idle:	529	program is otherwise idle:
…		…
526	will actively watch for new events and call your callbacks.	557	will actively watch for new events and call your callbacks.
527		558
528	AnyEvent is slightly different: it expects somebody else to run the event	559	AnyEvent is slightly different: it expects somebody else to run the event
529	loop and will only block when necessary (usually when told by the user).	560	loop and will only block when necessary (usually when told by the user).
530		561
531	The instrument to do that is called a "condition variable", so called	562	The tool to do that is called a "condition variable", so called because
532	because they represent a condition that must become true.	563	they represent a condition that must become true.
533		564
534	Now is probably a good time to look at the examples further below.	565	Now is probably a good time to look at the examples further below.
535		566
536	Condition variables can be created by calling the C<< AnyEvent->condvar	567	Condition variables can be created by calling the C<< AnyEvent->condvar
537	>> method, usually without arguments. The only argument pair allowed is	568	>> method, usually without arguments. The only argument pair allowed is
…		…
542	After creation, the condition variable is "false" until it becomes "true"	573	After creation, the condition variable is "false" until it becomes "true"
543	by calling the C<send> method (or calling the condition variable as if it	574	by calling the C<send> method (or calling the condition variable as if it
544	were a callback, read about the caveats in the description for the C<<	575	were a callback, read about the caveats in the description for the C<<
545	->send >> method).	576	->send >> method).
546		577
547	Condition variables are similar to callbacks, except that you can	578	Since condition variables are the most complex part of the AnyEvent API, here are
548	optionally wait for them. They can also be called merge points - points	579	some different mental models of what they are - pick the ones you can connect to:
549	in time where multiple outstanding events have been processed. And yet	580
550	another way to call them is transactions - each condition variable can be	581	=over 4
551	used to represent a transaction, which finishes at some point and delivers	582
552	a result. And yet some people know them as "futures" - a promise to	583	=item * Condition variables are like callbacks - you can call them (and pass them instead
553	compute/deliver something that you can wait for.	584	of callbacks). Unlike callbacks however, you can also wait for them to be called.
		585
		586	=item * Condition variables are signals - one side can emit or send them,
		587	the other side can wait for them, or install a handler that is called when
		588	the signal fires.
		589
		590	=item * Condition variables are like "Merge Points" - points in your program
		591	where you merge multiple independent results/control flows into one.
		592
		593	=item * Condition variables represent a transaction - function that start
		594	some kind of transaction can return them, leaving the caller the choice
		595	between waiting in a blocking fashion, or setting a callback.
		596
		597	=item * Condition variables represent future values, or promises to deliver
		598	some result, long before the result is available.
		599
		600	=back
554		601
555	Condition variables are very useful to signal that something has finished,	602	Condition variables are very useful to signal that something has finished,
556	for example, if you write a module that does asynchronous http requests,	603	for example, if you write a module that does asynchronous http requests,
557	then a condition variable would be the ideal candidate to signal the	604	then a condition variable would be the ideal candidate to signal the
558	availability of results. The user can either act when the callback is	605	availability of results. The user can either act when the callback is
…		…
579	eventually calls C<< -> send >>, and the "consumer side", which waits	626	eventually calls C<< -> send >>, and the "consumer side", which waits
580	for the send to occur.	627	for the send to occur.
581		628
582	Example: wait for a timer.	629	Example: wait for a timer.
583		630
584	# wait till the result is ready	631	# condition: "wait till the timer is fired"
585	my $result_ready = AnyEvent->condvar;	632	my $timer_fired = AnyEvent->condvar;
586		633
587	# do something such as adding a timer	634	# create the timer - we could wait for, say
588	# or socket watcher the calls $result_ready->send	635	# a handle becomign ready, or even an
589	# when the "result" is ready.	636	# AnyEvent::HTTP request to finish, but
590	# in this case, we simply use a timer:	637	# in this case, we simply use a timer:
591	my $w = AnyEvent->timer (	638	my $w = AnyEvent->timer (
592	after => 1,	639	after => 1,
593	cb => sub { $result_ready->send },	640	cb => sub { $timer_fired->send },
594	);	641	);
595		642
596	# this "blocks" (while handling events) till the callback	643	# this "blocks" (while handling events) till the callback
597	# calls -<send	644	# calls ->send
598	$result_ready->recv;	645	$timer_fired->recv;
599		646
600	Example: wait for a timer, but take advantage of the fact that condition	647	Example: wait for a timer, but take advantage of the fact that condition
601	variables are also callable directly.	648	variables are also callable directly.
602		649
603	my $done = AnyEvent->condvar;	650	my $done = AnyEvent->condvar;
…		…
666	one. For example, a function that pings many hosts in parallel might want	713	one. For example, a function that pings many hosts in parallel might want
667	to use a condition variable for the whole process.	714	to use a condition variable for the whole process.
668		715
669	Every call to C<< ->begin >> will increment a counter, and every call to	716	Every call to C<< ->begin >> will increment a counter, and every call to
670	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	717	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
671	>>, the (last) callback passed to C<begin> will be executed. That callback	718	>>, the (last) callback passed to C<begin> will be executed, passing the
672	is I<supposed> to call C<< ->send >>, but that is not required. If no	719	condvar as first argument. That callback is I<supposed> to call C<< ->send
673	callback was set, C<send> will be called without any arguments.	720	>>, but that is not required. If no group callback was set, C<send> will
		721	be called without any arguments.
674		722
675	You can think of C<< $cv->send >> giving you an OR condition (one call	723	You can think of C<< $cv->send >> giving you an OR condition (one call
676	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	724	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
677	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	725	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
678		726
…		…
705	begung can potentially be zero:	753	begung can potentially be zero:
706		754
707	my $cv = AnyEvent->condvar;	755	my $cv = AnyEvent->condvar;
708		756
709	my %result;	757	my %result;
710	$cv->begin (sub { $cv->send (\%result) });	758	$cv->begin (sub { shift->send (\%result) });
711		759
712	for my $host (@list_of_hosts) {	760	for my $host (@list_of_hosts) {
713	$cv->begin;	761	$cv->begin;
714	ping_host_then_call_callback $host, sub {	762	ping_host_then_call_callback $host, sub {
715	$result{$host} = ...;	763	$result{$host} = ...;
…		…
806	=over 4	854	=over 4
807		855
808	=item Backends that are autoprobed when no other event loop can be found.	856	=item Backends that are autoprobed when no other event loop can be found.
809		857
810	EV is the preferred backend when no other event loop seems to be in	858	EV is the preferred backend when no other event loop seems to be in
811	use. If EV is not installed, then AnyEvent will try Event, and, failing	859	use. If EV is not installed, then AnyEvent will fall back to its own
812	that, will fall back to its own pure-perl implementation, which is	860	pure-perl implementation, which is available everywhere as it comes with
813	available everywhere as it comes with AnyEvent itself.	861	AnyEvent itself.
814		862
815	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	863	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
816	AnyEvent::Impl::Event based on Event, very stable, few glitches.
817	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	864	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
818		865
819	=item Backends that are transparently being picked up when they are used.	866	=item Backends that are transparently being picked up when they are used.
820		867
821	These will be used when they are currently loaded when the first watcher	868	These will be used when they are currently loaded when the first watcher
822	is created, in which case it is assumed that the application is using	869	is created, in which case it is assumed that the application is using
823	them. This means that AnyEvent will automatically pick the right backend	870	them. This means that AnyEvent will automatically pick the right backend
824	when the main program loads an event module before anything starts to	871	when the main program loads an event module before anything starts to
825	create watchers. Nothing special needs to be done by the main program.	872	create watchers. Nothing special needs to be done by the main program.
826		873
		874	AnyEvent::Impl::Event based on Event, very stable, few glitches.
827	AnyEvent::Impl::Glib based on Glib, slow but very stable.	875	AnyEvent::Impl::Glib based on Glib, slow but very stable.
828	AnyEvent::Impl::Tk based on Tk, very broken.	876	AnyEvent::Impl::Tk based on Tk, very broken.
829	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	877	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
830	AnyEvent::Impl::POE based on POE, very slow, some limitations.	878	AnyEvent::Impl::POE based on POE, very slow, some limitations.
831	AnyEvent::Impl::Irssi used when running within irssi.	879	AnyEvent::Impl::Irssi used when running within irssi.
…		…
941	You should check C<$AnyEvent::MODEL> before adding to this array, though:	989	You should check C<$AnyEvent::MODEL> before adding to this array, though:
942	if it is defined then the event loop has already been detected, and the	990	if it is defined then the event loop has already been detected, and the
943	array will be ignored.	991	array will be ignored.
944		992
945	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	993	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
946	it,as it takes care of these details.	994	it, as it takes care of these details.
947		995
948	This variable is mainly useful for modules that can do something useful	996	This variable is mainly useful for modules that can do something useful
949	when AnyEvent is used and thus want to know when it is initialised, but do	997	when AnyEvent is used and thus want to know when it is initialised, but do
950	not need to even load it by default. This array provides the means to hook	998	not need to even load it by default. This array provides the means to hook
951	into AnyEvent passively, without loading it.	999	into AnyEvent passively, without loading it.
		1000
		1001	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		1002	together, you could put this into Coro (this is the actual code used by
		1003	Coro to accomplish this):
		1004
		1005	if (defined $AnyEvent::MODEL) {
		1006	# AnyEvent already initialised, so load Coro::AnyEvent
		1007	require Coro::AnyEvent;
		1008	} else {
		1009	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		1010	# as soon as it is
		1011	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		1012	}
952		1013
953	=back	1014	=back
954		1015
955	=head1 WHAT TO DO IN A MODULE	1016	=head1 WHAT TO DO IN A MODULE
956		1017
…		…
1013	=head1 OTHER MODULES	1074	=head1 OTHER MODULES
1014		1075
1015	The following is a non-exhaustive list of additional modules that use	1076	The following is a non-exhaustive list of additional modules that use
1016	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1077	AnyEvent as a client and can therefore be mixed easily with other AnyEvent
1017	modules and other event loops in the same program. Some of the modules	1078	modules and other event loops in the same program. Some of the modules
1018	come with AnyEvent, most are available via CPAN.	1079	come as part of AnyEvent, the others are available via CPAN.
1019		1080
1020	=over 4	1081	=over 4
1021		1082
1022	=item L<AnyEvent::Util>	1083	=item L<AnyEvent::Util>
1023		1084
…		…
1038		1099
1039	=item L<AnyEvent::DNS>	1100	=item L<AnyEvent::DNS>
1040		1101
1041	Provides rich asynchronous DNS resolver capabilities.	1102	Provides rich asynchronous DNS resolver capabilities.
1042		1103
		1104	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
		1105
		1106	Implement event-based interfaces to the protocols of the same name (for
		1107	the curious, IGS is the International Go Server and FCP is the Freenet
		1108	Client Protocol).
		1109
		1110	=item L<AnyEvent::Handle::UDP>
		1111
		1112	Here be danger!
		1113
		1114	As Pauli would put it, "Not only is it not right, it's not even wrong!" -
		1115	there are so many things wrong with AnyEvent::Handle::UDP, most notably
		1116	it's use of a stream-based API with a protocol that isn't streamable, that
		1117	the only way to improve it is to delete it.
		1118
		1119	It features data corruption (but typically only under load) and general
		1120	confusion. On top, the author is not only clueless about UDP but also
		1121	fact-resistant - some gems of his understanding: "connect doesn't work
		1122	with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
		1123	packets", "I don't need to implement proper error checking as UDP doesn't
		1124	support error checking" and so on - he doesn't even understand what's
		1125	wrong with his module when it is explained to him.
		1126
1043	=item L<AnyEvent::HTTP>	1127	=item L<AnyEvent::DBI>
1044		1128
1045	A simple-to-use HTTP library that is capable of making a lot of concurrent	1129	Executes L<DBI> requests asynchronously in a proxy process for you,
1046	HTTP requests.	1130	notifying you in an event-bnased way when the operation is finished.
		1131
		1132	=item L<AnyEvent::AIO>
		1133
		1134	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
		1135	toolbox of every event programmer. AnyEvent::AIO transparently fuses
		1136	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
		1137	file I/O, and much more.
1047		1138
1048	=item L<AnyEvent::HTTPD>	1139	=item L<AnyEvent::HTTPD>
1049		1140
1050	Provides a simple web application server framework.	1141	A simple embedded webserver.
1051		1142
1052	=item L<AnyEvent::FastPing>	1143	=item L<AnyEvent::FastPing>
1053		1144
1054	The fastest ping in the west.	1145	The fastest ping in the west.
1055
1056	=item L<AnyEvent::DBI>
1057
1058	Executes L<DBI> requests asynchronously in a proxy process.
1059
1060	=item L<AnyEvent::AIO>
1061
1062	Truly asynchronous I/O, should be in the toolbox of every event
1063	programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent
1064	together.
1065
1066	=item L<AnyEvent::BDB>
1067
1068	Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses
1069	L<BDB> and AnyEvent together.
1070
1071	=item L<AnyEvent::GPSD>
1072
1073	A non-blocking interface to gpsd, a daemon delivering GPS information.
1074
1075	=item L<AnyEvent::IRC>
1076
1077	AnyEvent based IRC client module family (replacing the older Net::IRC3).
1078
1079	=item L<AnyEvent::XMPP>
1080
1081	AnyEvent based XMPP (Jabber protocol) module family (replacing the older
1082	Net::XMPP2>.
1083
1084	=item L<AnyEvent::IGS>
1085
1086	A non-blocking interface to the Internet Go Server protocol (used by
1087	L<App::IGS>).
1088
1089	=item L<Net::FCP>
1090
1091	AnyEvent-based implementation of the Freenet Client Protocol, birthplace
1092	of AnyEvent.
1093
1094	=item L<Event::ExecFlow>
1095
1096	High level API for event-based execution flow control.
1097		1146
1098	=item L<Coro>	1147	=item L<Coro>
1099		1148
1100	Has special support for AnyEvent via L<Coro::AnyEvent>.	1149	Has special support for AnyEvent via L<Coro::AnyEvent>.
1101		1150
…		…
1105		1154
1106	package AnyEvent;	1155	package AnyEvent;
1107		1156
1108	# basically a tuned-down version of common::sense	1157	# basically a tuned-down version of common::sense
1109	sub common_sense {	1158	sub common_sense {
1110	# no warnings	1159	# from common:.sense 1.0
1111	${^WARNING_BITS} ^= ${^WARNING_BITS};	1160	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1112	# use strict vars subs	1161	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1113	$^H \|= 0x00000600;	1162	$^H \|= 0x00000600;
1114	}	1163	}
1115		1164
1116	BEGIN { AnyEvent::common_sense }	1165	BEGIN { AnyEvent::common_sense }
1117		1166
1118	use Carp ();	1167	use Carp ();
1119		1168
1120	our $VERSION = 4.9;	1169	our $VERSION = '5.271';
1121	our $MODEL;	1170	our $MODEL;
1122		1171
1123	our $AUTOLOAD;	1172	our $AUTOLOAD;
1124	our @ISA;	1173	our @ISA;
1125		1174
1126	our @REGISTRY;	1175	our @REGISTRY;
1127		1176
1128	our $WIN32;
1129
1130	our $VERBOSE;	1177	our $VERBOSE;
1131		1178
1132	BEGIN {	1179	BEGIN {
1133	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1180	require "AnyEvent/constants.pl";
		1181
1134	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1182	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1135		1183
1136	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1184	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1137	if ${^TAINT};	1185	if ${^TAINT};
1138		1186
1139	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1187	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1151	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1199	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1152	}	1200	}
1153		1201
1154	my @models = (	1202	my @models = (
1155	[EV:: => AnyEvent::Impl::EV:: , 1],	1203	[EV:: => AnyEvent::Impl::EV:: , 1],
1156	[Event:: => AnyEvent::Impl::Event::, 1],
1157	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1204	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1158	# everything below here will not (normally) be autoprobed	1205	# everything below here will not (normally) be autoprobed
1159	# as the pureperl backend should work everywhere	1206	# as the pureperl backend should work everywhere
1160	# and is usually faster	1207	# and is usually faster
		1208	[Event:: => AnyEvent::Impl::Event::, 1],
1161	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1209	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1162	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1210	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1163	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1211	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1164	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1212	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1165	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1213	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
…		…
1168	[Prima:: => AnyEvent::Impl::POE::],	1216	[Prima:: => AnyEvent::Impl::POE::],
1169	# IO::Async is just too broken - we would need workarounds for its	1217	# IO::Async is just too broken - we would need workarounds for its
1170	# byzantine signal and broken child handling, among others.	1218	# byzantine signal and broken child handling, among others.
1171	# IO::Async is rather hard to detect, as it doesn't have any	1219	# IO::Async is rather hard to detect, as it doesn't have any
1172	# obvious default class.	1220	# obvious default class.
1173	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1221	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1174	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1222	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1175	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1223	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1224	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1176	);	1225	);
1177		1226
1178	our %method = map +($_ => 1),	1227	our %method = map +($_ => 1),
1179	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1228	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1180		1229
1181	our @post_detect;	1230	our @post_detect;
1182		1231
1183	sub post_detect(&) {	1232	sub post_detect(&) {
1184	my ($cb) = @_;	1233	my ($cb) = @_;
1185		1234
1186	if ($MODEL) {
1187	$cb->();
1188
1189	undef
1190	} else {
1191	push @post_detect, $cb;	1235	push @post_detect, $cb;
1192		1236
1193	defined wantarray	1237	defined wantarray
1194	? bless \$cb, "AnyEvent::Util::postdetect"	1238	? bless \$cb, "AnyEvent::Util::postdetect"
1195	: ()	1239	: ()
1196	}
1197	}	1240	}
1198		1241
1199	sub AnyEvent::Util::postdetect::DESTROY {	1242	sub AnyEvent::Util::postdetect::DESTROY {
1200	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1243	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1201	}	1244	}
1202		1245
1203	sub detect() {	1246	sub detect() {
		1247	# free some memory
		1248	*detect = sub () { $MODEL };
		1249
		1250	local $!; # for good measure
		1251	local $SIG{__DIE__};
		1252
		1253	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1254	my $model = "AnyEvent::Impl::$1";
		1255	if (eval "require $model") {
		1256	$MODEL = $model;
		1257	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1258	} else {
		1259	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1260	}
		1261	}
		1262
		1263	# check for already loaded models
1204	unless ($MODEL) {	1264	unless ($MODEL) {
1205	local $SIG{__DIE__};	1265	for (@REGISTRY, @models) {
1206		1266	my ($package, $model) = @$_;
1207	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1267	if (${"$package\::VERSION"} > 0) {
1208	my $model = "AnyEvent::Impl::$1";
1209	if (eval "require $model") {	1268	if (eval "require $model") {
1210	$MODEL = $model;	1269	$MODEL = $model;
1211	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1270	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1212	} else {	1271	last;
1213	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1272	}
1214	}	1273	}
1215	}	1274	}
1216		1275
1217	# check for already loaded models
1218	unless ($MODEL) {	1276	unless ($MODEL) {
		1277	# try to autoload a model
1219	for (@REGISTRY, @models) {	1278	for (@REGISTRY, @models) {
1220	my ($package, $model) = @$_;	1279	my ($package, $model, $autoload) = @$_;
		1280	if (
		1281	$autoload
		1282	and eval "require $package"
1221	if (${"$package\::VERSION"} > 0) {	1283	and ${"$package\::VERSION"} > 0
1222	if (eval "require $model") {	1284	and eval "require $model"
		1285	) {
1223	$MODEL = $model;	1286	$MODEL = $model;
1224	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1287	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1225	last;	1288	last;
1226	}
1227	}	1289	}
1228	}	1290	}
1229		1291
1230	unless ($MODEL) {
1231	# try to autoload a model
1232	for (@REGISTRY, @models) {
1233	my ($package, $model, $autoload) = @$_;
1234	if (
1235	$autoload
1236	and eval "require $package"
1237	and ${"$package\::VERSION"} > 0
1238	and eval "require $model"
1239	) {
1240	$MODEL = $model;
1241	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1242	last;
1243	}
1244	}
1245
1246	$MODEL	1292	$MODEL
1247	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1293	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1248	}
1249	}	1294	}
1250
1251	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1252
1253	unshift @ISA, $MODEL;
1254
1255	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1256
1257	(shift @post_detect)->() while @post_detect;
1258	}	1295	}
		1296
		1297	@models = (); # free probe data
		1298
		1299	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1300	unshift @ISA, $MODEL;
		1301
		1302	# now nuke some methods that are overriden by the backend.
		1303	# SUPER is not allowed.
		1304	for (qw(time signal child idle)) {
		1305	undef &{"AnyEvent::Base::$_"}
		1306	if defined &{"$MODEL\::$_"};
		1307	}
		1308
		1309	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1310
		1311	(shift @post_detect)->() while @post_detect;
		1312
		1313	*post_detect = sub(&) {
		1314	shift->();
		1315
		1316	undef
		1317	};
1259		1318
1260	$MODEL	1319	$MODEL
1261	}	1320	}
1262		1321
1263	sub AUTOLOAD {	1322	sub AUTOLOAD {
1264	(my $func = $AUTOLOAD) =~ s/.*://;	1323	(my $func = $AUTOLOAD) =~ s/.*://;
1265		1324
1266	$method{$func}	1325	$method{$func}
1267	or Carp::croak "$func: not a valid method for AnyEvent objects";	1326	or Carp::croak "$func: not a valid AnyEvent class method";
1268		1327
1269	detect unless $MODEL;	1328	detect;
1270		1329
1271	my $class = shift;	1330	my $class = shift;
1272	$class->$func (@_);	1331	$class->$func (@_);
1273	}	1332	}
1274		1333
…		…
1287	# we assume CLOEXEC is already set by perl in all important cases	1346	# we assume CLOEXEC is already set by perl in all important cases
1288		1347
1289	($fh2, $rw)	1348	($fh2, $rw)
1290	}	1349	}
1291		1350
		1351	=head1 SIMPLIFIED AE API
		1352
		1353	Starting with version 5.0, AnyEvent officially supports a second, much
		1354	simpler, API that is designed to reduce the calling, typing and memory
		1355	overhead by using function call syntax and a fixed number of parameters.
		1356
		1357	See the L<AE> manpage for details.
		1358
		1359	=cut
		1360
		1361	package AE;
		1362
		1363	our $VERSION = $AnyEvent::VERSION;
		1364
		1365	# fall back to the main API by default - backends and AnyEvent::Base
		1366	# implementations can overwrite these.
		1367
		1368	sub io($$$) {
		1369	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1370	}
		1371
		1372	sub timer($$$) {
		1373	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1374	}
		1375
		1376	sub signal($$) {
		1377	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1378	}
		1379
		1380	sub child($$) {
		1381	AnyEvent->child (pid => $_[0], cb => $_[1])
		1382	}
		1383
		1384	sub idle($) {
		1385	AnyEvent->idle (cb => $_[0])
		1386	}
		1387
		1388	sub cv(;&) {
		1389	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1390	}
		1391
		1392	sub now() {
		1393	AnyEvent->now
		1394	}
		1395
		1396	sub now_update() {
		1397	AnyEvent->now_update
		1398	}
		1399
		1400	sub time() {
		1401	AnyEvent->time
		1402	}
		1403
1292	package AnyEvent::Base;	1404	package AnyEvent::Base;
1293		1405
1294	# default implementations for many methods	1406	# default implementations for many methods
1295		1407
1296	sub _time {	1408	sub time {
		1409	eval q{ # poor man's autoloading {}
1297	# probe for availability of Time::HiRes	1410	# probe for availability of Time::HiRes
1298	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1411	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1299	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1412	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1300	*_time = \&Time::HiRes::time;	1413	*AE::time = \&Time::HiRes::time;
1301	# if (eval "use POSIX (); (POSIX::times())...	1414	# if (eval "use POSIX (); (POSIX::times())...
1302	} else {	1415	} else {
1303	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1416	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1304	*_time = sub { time }; # epic fail	1417	*AE::time = sub (){ time }; # epic fail
		1418	}
		1419
		1420	*time = sub { AE::time }; # different prototypes
1305	}	1421	};
		1422	die if $@;
1306		1423
1307	&_time	1424	&time
1308	}	1425	}
1309		1426
1310	sub time { _time }	1427	*now = \&time;
1311	sub now { _time }	1428
1312	sub now_update { }	1429	sub now_update { }
1313		1430
1314	# default implementation for ->condvar	1431	# default implementation for ->condvar
1315		1432
1316	sub condvar {	1433	sub condvar {
		1434	eval q{ # poor man's autoloading {}
		1435	*condvar = sub {
1317	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1436	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
		1437	};
		1438
		1439	*AE::cv = sub (;&) {
		1440	bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar"
		1441	};
		1442	};
		1443	die if $@;
		1444
		1445	&condvar
1318	}	1446	}
1319		1447
1320	# default implementation for ->signal	1448	# default implementation for ->signal
1321		1449
1322	our $HAVE_ASYNC_INTERRUPT;	1450	our $HAVE_ASYNC_INTERRUPT;
1323		1451
1324	sub _have_async_interrupt() {	1452	sub _have_async_interrupt() {
1325	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1453	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1326	&& eval "use Async::Interrupt 1.0 (); 1")	1454	&& eval "use Async::Interrupt 1.02 (); 1")
1327	unless defined $HAVE_ASYNC_INTERRUPT;	1455	unless defined $HAVE_ASYNC_INTERRUPT;
1328		1456
1329	$HAVE_ASYNC_INTERRUPT	1457	$HAVE_ASYNC_INTERRUPT
1330	}	1458	}
1331		1459
1332	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1460	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1333	our (%SIG_ASY, %SIG_ASY_W);	1461	our (%SIG_ASY, %SIG_ASY_W);
1334	our ($SIG_COUNT, $SIG_TW);	1462	our ($SIG_COUNT, $SIG_TW);
1335		1463
1336	sub _signal_exec {
1337	$HAVE_ASYNC_INTERRUPT
1338	? $SIGPIPE_R->drain
1339	: sysread $SIGPIPE_R, my $dummy, 9;
1340
1341	while (%SIG_EV) {
1342	for (keys %SIG_EV) {
1343	delete $SIG_EV{$_};
1344	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1345	}
1346	}
1347	}
1348
1349	# install a dummy wakeup watcher to reduce signal catching latency	1464	# install a dummy wakeup watcher to reduce signal catching latency
		1465	# used by Impls
1350	sub _sig_add() {	1466	sub _sig_add() {
1351	unless ($SIG_COUNT++) {	1467	unless ($SIG_COUNT++) {
1352	# try to align timer on a full-second boundary, if possible	1468	# try to align timer on a full-second boundary, if possible
1353	my $NOW = AnyEvent->now;	1469	my $NOW = AE::now;
1354		1470
1355	$SIG_TW = AnyEvent->timer (	1471	$SIG_TW = AE::timer
1356	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1472	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1357	interval => $MAX_SIGNAL_LATENCY,	1473	$MAX_SIGNAL_LATENCY,
1358	cb => sub { }, # just for the PERL_ASYNC_CHECK	1474	sub { } # just for the PERL_ASYNC_CHECK
1359	);	1475	;
1360	}	1476	}
1361	}	1477	}
1362		1478
1363	sub _sig_del {	1479	sub _sig_del {
1364	undef $SIG_TW	1480	undef $SIG_TW
1365	unless --$SIG_COUNT;	1481	unless --$SIG_COUNT;
1366	}	1482	}
1367		1483
1368	our $_sig_name_init; $_sig_name_init = sub {	1484	our $_sig_name_init; $_sig_name_init = sub {
1369	eval q{ # poor man's autoloading	1485	eval q{ # poor man's autoloading {}
1370	undef $_sig_name_init;	1486	undef $_sig_name_init;
1371		1487
1372	if (_have_async_interrupt) {	1488	if (_have_async_interrupt) {
1373	*sig2num = \&Async::Interrupt::sig2num;	1489	*sig2num = \&Async::Interrupt::sig2num;
1374	*sig2name = \&Async::Interrupt::sig2name;	1490	*sig2name = \&Async::Interrupt::sig2name;
…		…
1401	# probe for availability of Async::Interrupt	1517	# probe for availability of Async::Interrupt
1402	if (_have_async_interrupt) {	1518	if (_have_async_interrupt) {
1403	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1519	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1404		1520
1405	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1521	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1406	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);	1522	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1407		1523
1408	} else {	1524	} else {
1409	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1525	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1410
1411	require Fcntl;
1412		1526
1413	if (AnyEvent::WIN32) {	1527	if (AnyEvent::WIN32) {
1414	require AnyEvent::Util;	1528	require AnyEvent::Util;
1415		1529
1416	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1530	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1417	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;	1531	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
1418	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case	1532	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
1419	} else {	1533	} else {
1420	pipe $SIGPIPE_R, $SIGPIPE_W;	1534	pipe $SIGPIPE_R, $SIGPIPE_W;
1421	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;	1535	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
1422	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case	1536	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
1423		1537
1424	# not strictly required, as $^F is normally 2, but let's make sure...	1538	# not strictly required, as $^F is normally 2, but let's make sure...
1425	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1539	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1426	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1540	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1427	}	1541	}
1428		1542
1429	$SIGPIPE_R	1543	$SIGPIPE_R
1430	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1544	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1431		1545
1432	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);	1546	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
1433	}	1547	}
1434		1548
1435	*signal = sub {	1549	*signal = $HAVE_ASYNC_INTERRUPT
		1550	? sub {
1436	my (undef, %arg) = @_;	1551	my (undef, %arg) = @_;
1437		1552
1438	my $signal = uc $arg{signal}
1439	or Carp::croak "required option 'signal' is missing";
1440
1441	if ($HAVE_ASYNC_INTERRUPT) {
1442	# async::interrupt	1553	# async::interrupt
1443
1444	$signal = sig2num $signal;	1554	my $signal = sig2num $arg{signal};
1445	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1555	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1446		1556
1447	$SIG_ASY{$signal} \|\|= new Async::Interrupt	1557	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1448	cb => sub { undef $SIG_EV{$signal} },	1558	cb => sub { undef $SIG_EV{$signal} },
1449	signal => $signal,	1559	signal => $signal,
1450	pipe => [$SIGPIPE_R->filenos],	1560	pipe => [$SIGPIPE_R->filenos],
1451	pipe_autodrain => 0,	1561	pipe_autodrain => 0,
1452	;	1562	;
1453		1563
1454	} else {	1564	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1565	}
		1566	: sub {
		1567	my (undef, %arg) = @_;
		1568
1455	# pure perl	1569	# pure perl
1456
1457	# AE::Util has been loaded in signal
1458	$signal = sig2name $signal;	1570	my $signal = sig2name $arg{signal};
1459	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1571	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1460		1572
1461	$SIG{$signal} \|\|= sub {	1573	$SIG{$signal} \|\|= sub {
1462	local $!;	1574	local $!;
1463	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1575	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1464	undef $SIG_EV{$signal};	1576	undef $SIG_EV{$signal};
1465	};	1577	};
1466		1578
1467	# can't do signal processing without introducing races in pure perl,	1579	# can't do signal processing without introducing races in pure perl,
1468	# so limit the signal latency.	1580	# so limit the signal latency.
1469	_sig_add;	1581	_sig_add;
1470	}
1471		1582
1472	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"	1583	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1584	}
1473	};	1585	;
1474		1586
1475	*AnyEvent::Base::signal::DESTROY = sub {	1587	*AnyEvent::Base::signal::DESTROY = sub {
1476	my ($signal, $cb) = @{$_[0]};	1588	my ($signal, $cb) = @{$_[0]};
1477		1589
1478	_sig_del;	1590	_sig_del;
…		…
1485	# print weird messages, or just unconditionally exit	1597	# print weird messages, or just unconditionally exit
1486	# instead of getting the default action.	1598	# instead of getting the default action.
1487	undef $SIG{$signal}	1599	undef $SIG{$signal}
1488	unless keys %{ $SIG_CB{$signal} };	1600	unless keys %{ $SIG_CB{$signal} };
1489	};	1601	};
		1602
		1603	*_signal_exec = sub {
		1604	$HAVE_ASYNC_INTERRUPT
		1605	? $SIGPIPE_R->drain
		1606	: sysread $SIGPIPE_R, (my $dummy), 9;
		1607
		1608	while (%SIG_EV) {
		1609	for (keys %SIG_EV) {
		1610	delete $SIG_EV{$_};
		1611	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1612	}
		1613	}
		1614	};
1490	};	1615	};
1491	die if $@;	1616	die if $@;
		1617
1492	&signal	1618	&signal
1493	}	1619	}
1494		1620
1495	# default implementation for ->child	1621	# default implementation for ->child
1496		1622
1497	our %PID_CB;	1623	our %PID_CB;
1498	our $CHLD_W;	1624	our $CHLD_W;
1499	our $CHLD_DELAY_W;	1625	our $CHLD_DELAY_W;
1500	our $WNOHANG;	1626	our $WNOHANG;
1501		1627
		1628	# used by many Impl's
1502	sub _emit_childstatus($$) {	1629	sub _emit_childstatus($$) {
1503	my (undef, $rpid, $rstatus) = @_;	1630	my (undef, $rpid, $rstatus) = @_;
1504		1631
1505	$_->($rpid, $rstatus)	1632	$_->($rpid, $rstatus)
1506	for values %{ $PID_CB{$rpid} \|\| {} },	1633	for values %{ $PID_CB{$rpid} \|\| {} },
1507	values %{ $PID_CB{0} \|\| {} };	1634	values %{ $PID_CB{0} \|\| {} };
1508	}	1635	}
1509		1636
1510	sub _sigchld {
1511	my $pid;
1512
1513	AnyEvent->_emit_childstatus ($pid, $?)
1514	while ($pid = waitpid -1, $WNOHANG) > 0;
1515	}
1516
1517	sub child {	1637	sub child {
		1638	eval q{ # poor man's autoloading {}
		1639	*_sigchld = sub {
		1640	my $pid;
		1641
		1642	AnyEvent->_emit_childstatus ($pid, $?)
		1643	while ($pid = waitpid -1, $WNOHANG) > 0;
		1644	};
		1645
		1646	*child = sub {
1518	my (undef, %arg) = @_;	1647	my (undef, %arg) = @_;
1519		1648
1520	defined (my $pid = $arg{pid} + 0)	1649	defined (my $pid = $arg{pid} + 0)
1521	or Carp::croak "required option 'pid' is missing";	1650	or Carp::croak "required option 'pid' is missing";
1522		1651
1523	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1652	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1524		1653
1525	# WNOHANG is almost cetrainly 1 everywhere	1654	# WNOHANG is almost cetrainly 1 everywhere
1526	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1655	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1527	? 1	1656	? 1
1528	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1657	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1529		1658
1530	unless ($CHLD_W) {	1659	unless ($CHLD_W) {
1531	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1660	$CHLD_W = AE::signal CHLD => \&_sigchld;
1532	# child could be a zombie already, so make at least one round	1661	# child could be a zombie already, so make at least one round
1533	&_sigchld;	1662	&_sigchld;
1534	}	1663	}
1535		1664
1536	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1665	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1537	}	1666	};
1538		1667
1539	sub AnyEvent::Base::child::DESTROY {	1668	*AnyEvent::Base::child::DESTROY = sub {
1540	my ($pid, $cb) = @{$_[0]};	1669	my ($pid, $cb) = @{$_[0]};
1541		1670
1542	delete $PID_CB{$pid}{$cb};	1671	delete $PID_CB{$pid}{$cb};
1543	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1672	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1544		1673
1545	undef $CHLD_W unless keys %PID_CB;	1674	undef $CHLD_W unless keys %PID_CB;
		1675	};
		1676	};
		1677	die if $@;
		1678
		1679	&child
1546	}	1680	}
1547		1681
1548	# idle emulation is done by simply using a timer, regardless	1682	# idle emulation is done by simply using a timer, regardless
1549	# of whether the process is idle or not, and not letting	1683	# of whether the process is idle or not, and not letting
1550	# the callback use more than 50% of the time.	1684	# the callback use more than 50% of the time.
1551	sub idle {	1685	sub idle {
		1686	eval q{ # poor man's autoloading {}
		1687	*idle = sub {
1552	my (undef, %arg) = @_;	1688	my (undef, %arg) = @_;
1553		1689
1554	my ($cb, $w, $rcb) = $arg{cb};	1690	my ($cb, $w, $rcb) = $arg{cb};
1555		1691
1556	$rcb = sub {	1692	$rcb = sub {
1557	if ($cb) {	1693	if ($cb) {
1558	$w = _time;	1694	$w = _time;
1559	&$cb;	1695	&$cb;
1560	$w = _time - $w;	1696	$w = _time - $w;
1561		1697
1562	# never use more then 50% of the time for the idle watcher,	1698	# never use more then 50% of the time for the idle watcher,
1563	# within some limits	1699	# within some limits
1564	$w = 0.0001 if $w < 0.0001;	1700	$w = 0.0001 if $w < 0.0001;
1565	$w = 5 if $w > 5;	1701	$w = 5 if $w > 5;
1566		1702
1567	$w = AnyEvent->timer (after => $w, cb => $rcb);	1703	$w = AE::timer $w, 0, $rcb;
1568	} else {	1704	} else {
1569	# clean up...	1705	# clean up...
1570	undef $w;	1706	undef $w;
1571	undef $rcb;	1707	undef $rcb;
		1708	}
		1709	};
		1710
		1711	$w = AE::timer 0.05, 0, $rcb;
		1712
		1713	bless \\$cb, "AnyEvent::Base::idle"
1572	}	1714	};
		1715
		1716	*AnyEvent::Base::idle::DESTROY = sub {
		1717	undef $${$_[0]};
		1718	};
1573	};	1719	};
		1720	die if $@;
1574		1721
1575	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1722	&idle
1576
1577	bless \\$cb, "AnyEvent::Base::idle"
1578	}
1579
1580	sub AnyEvent::Base::idle::DESTROY {
1581	undef $${$_[0]};
1582	}	1723	}
1583		1724
1584	package AnyEvent::CondVar;	1725	package AnyEvent::CondVar;
1585		1726
1586	our @ISA = AnyEvent::CondVar::Base::;	1727	our @ISA = AnyEvent::CondVar::Base::;
…		…
1640		1781
1641	@_	1782	@_
1642	and $cv->{_ae_cb} = shift	1783	and $cv->{_ae_cb} = shift
1643	and $cv->{_ae_sent}	1784	and $cv->{_ae_sent}
1644	and (delete $cv->{_ae_cb})->($cv);	1785	and (delete $cv->{_ae_cb})->($cv);
		1786
1645	$cv->{_ae_cb}	1787	$cv->{_ae_cb}
1646	}	1788	}
1647		1789
1648	sub begin {	1790	sub begin {
1649	++$_[0]{_ae_counter};	1791	++$_[0]{_ae_counter};
…		…
1656	}	1798	}
1657		1799
1658	# undocumented/compatibility with pre-3.4	1800	# undocumented/compatibility with pre-3.4
1659	*broadcast = \&send;	1801	*broadcast = \&send;
1660	*wait = \&_wait;	1802	*wait = \&_wait;
1661
1662	#############################################################################
1663	# "new" API, currently only emulation of it
1664	#############################################################################
1665
1666	package AE;
1667
1668	sub io($$$) {
1669	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1670	}
1671
1672	sub timer($$$) {
1673	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2]);
1674	}
1675
1676	sub signal($$) {
1677	AnyEvent->signal (signal => $_[0], cb => $_[1]);
1678	}
1679
1680	sub child($$) {
1681	AnyEvent->child (pid => $_[0], cb => $_[1]);
1682	}
1683
1684	sub idle($) {
1685	AnyEvent->idle (cb => $_[0]);
1686	}
1687
1688	sub cv() {
1689	AnyEvent->condvar
1690	}
1691
1692	sub now() {
1693	AnyEvent->now
1694	}
1695
1696	sub now_update() {
1697	AnyEvent->now_update
1698	}
1699
1700	sub time() {
1701	AnyEvent->time
1702	}
1703		1803
1704	=head1 ERROR AND EXCEPTION HANDLING	1804	=head1 ERROR AND EXCEPTION HANDLING
1705		1805
1706	In general, AnyEvent does not do any error handling - it relies on the	1806	In general, AnyEvent does not do any error handling - it relies on the
1707	caller to do that if required. The L<AnyEvent::Strict> module (see also	1807	caller to do that if required. The L<AnyEvent::Strict> module (see also
…		…
1901	warn "read: $input\n"; # output what has been read	2001	warn "read: $input\n"; # output what has been read
1902	$cv->send if $input =~ /^q/i; # quit program if /^q/i	2002	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1903	},	2003	},
1904	);	2004	);
1905		2005
1906	my $time_watcher; # can only be used once
1907
1908	sub new_timer {
1909	$timer = AnyEvent->timer (after => 1, cb => sub {	2006	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1910	warn "timeout\n"; # print 'timeout' about every second	2007	warn "timeout\n"; # print 'timeout' at most every second
1911	&new_timer; # and restart the time
1912	});	2008	});
1913	}
1914
1915	new_timer; # create first timer
1916		2009
1917	$cv->recv; # wait until user enters /^q/i	2010	$cv->recv; # wait until user enters /^q/i
1918		2011
1919	=head1 REAL-WORLD EXAMPLE	2012	=head1 REAL-WORLD EXAMPLE
1920		2013
…		…
1993		2086
1994	The actual code goes further and collects all errors (C<die>s, exceptions)	2087	The actual code goes further and collects all errors (C<die>s, exceptions)
1995	that occurred during request processing. The C<result> method detects	2088	that occurred during request processing. The C<result> method detects
1996	whether an exception as thrown (it is stored inside the $txn object)	2089	whether an exception as thrown (it is stored inside the $txn object)
1997	and just throws the exception, which means connection errors and other	2090	and just throws the exception, which means connection errors and other
1998	problems get reported tot he code that tries to use the result, not in a	2091	problems get reported to the code that tries to use the result, not in a
1999	random callback.	2092	random callback.
2000		2093
2001	All of this enables the following usage styles:	2094	All of this enables the following usage styles:
2002		2095
2003	1. Blocking:	2096	1. Blocking:
…		…
2051	through AnyEvent. The benchmark creates a lot of timers (with a zero	2144	through AnyEvent. The benchmark creates a lot of timers (with a zero
2052	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2145	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
2053	which it is), lets them fire exactly once and destroys them again.	2146	which it is), lets them fire exactly once and destroys them again.
2054		2147
2055	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2148	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
2056	distribution.	2149	distribution. It uses the L<AE> interface, which makes a real difference
		2150	for the EV and Perl backends only.
2057		2151
2058	=head3 Explanation of the columns	2152	=head3 Explanation of the columns
2059		2153
2060	I<watcher> is the number of event watchers created/destroyed. Since	2154	I<watcher> is the number of event watchers created/destroyed. Since
2061	different event models feature vastly different performances, each event	2155	different event models feature vastly different performances, each event
…		…
2082	watcher.	2176	watcher.
2083		2177
2084	=head3 Results	2178	=head3 Results
2085		2179
2086	name watchers bytes create invoke destroy comment	2180	name watchers bytes create invoke destroy comment
2087	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2181	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
2088	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2182	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
2089	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2183	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
2090	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2184	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
2091	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2185	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
2092	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2186	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
2093	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2187	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
2094	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2188	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
2095	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2189	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
2096	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2190	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
2097	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2191	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
2098	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2192	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2099		2193
2100	=head3 Discussion	2194	=head3 Discussion
2101		2195
2102	The benchmark does I<not> measure scalability of the event loop very	2196	The benchmark does I<not> measure scalability of the event loop very
2103	well. For example, a select-based event loop (such as the pure perl one)	2197	well. For example, a select-based event loop (such as the pure perl one)
…		…
2115	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2209	benchmark machine, handling an event takes roughly 1600 CPU cycles with
2116	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2210	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2117	cycles with POE.	2211	cycles with POE.
2118		2212
2119	C<EV> is the sole leader regarding speed and memory use, which are both	2213	C<EV> is the sole leader regarding speed and memory use, which are both
2120	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2214	maximal/minimal, respectively. When using the L<AE> API there is zero
		2215	overhead (when going through the AnyEvent API create is about 5-6 times
		2216	slower, with other times being equal, so still uses far less memory than
2121	far less memory than any other event loop and is still faster than Event	2217	any other event loop and is still faster than Event natively).
2122	natively.
2123		2218
2124	The pure perl implementation is hit in a few sweet spots (both the	2219	The pure perl implementation is hit in a few sweet spots (both the
2125	constant timeout and the use of a single fd hit optimisations in the perl	2220	constant timeout and the use of a single fd hit optimisations in the perl
2126	interpreter and the backend itself). Nevertheless this shows that it	2221	interpreter and the backend itself). Nevertheless this shows that it
2127	adds very little overhead in itself. Like any select-based backend its	2222	adds very little overhead in itself. Like any select-based backend its
…		…
2201	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2296	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2202	(1%) are active. This mirrors the activity of large servers with many	2297	(1%) are active. This mirrors the activity of large servers with many
2203	connections, most of which are idle at any one point in time.	2298	connections, most of which are idle at any one point in time.
2204		2299
2205	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2300	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2206	distribution.	2301	distribution. It uses the L<AE> interface, which makes a real difference
		2302	for the EV and Perl backends only.
2207		2303
2208	=head3 Explanation of the columns	2304	=head3 Explanation of the columns
2209		2305
2210	I<sockets> is the number of sockets, and twice the number of "servers" (as	2306	I<sockets> is the number of sockets, and twice the number of "servers" (as
2211	each server has a read and write socket end).	2307	each server has a read and write socket end).
…		…
2219	a new one that moves the timeout into the future.	2315	a new one that moves the timeout into the future.
2220		2316
2221	=head3 Results	2317	=head3 Results
2222		2318
2223	name sockets create request	2319	name sockets create request
2224	EV 20000 69.01 11.16	2320	EV 20000 62.66 7.99
2225	Perl 20000 73.32 35.87	2321	Perl 20000 68.32 32.64
2226	IOAsync 20000 157.00 98.14 epoll	2322	IOAsync 20000 174.06 101.15 epoll
2227	IOAsync 20000 159.31 616.06 poll	2323	IOAsync 20000 174.67 610.84 poll
2228	Event 20000 212.62 257.32	2324	Event 20000 202.69 242.91
2229	Glib 20000 651.16 1896.30	2325	Glib 20000 557.01 1689.52
2230	POE 20000 349.67 12317.24 uses POE::Loop::Event	2326	POE 20000 341.54 12086.32 uses POE::Loop::Event
2231		2327
2232	=head3 Discussion	2328	=head3 Discussion
2233		2329
2234	This benchmark I<does> measure scalability and overall performance of the	2330	This benchmark I<does> measure scalability and overall performance of the
2235	particular event loop.	2331	particular event loop.
…		…
2361	As you can see, the AnyEvent + EV combination even beats the	2457	As you can see, the AnyEvent + EV combination even beats the
2362	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2458	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2363	backend easily beats IO::Lambda and POE.	2459	backend easily beats IO::Lambda and POE.
2364		2460
2365	And even the 100% non-blocking version written using the high-level (and	2461	And even the 100% non-blocking version written using the high-level (and
2366	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2462	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2367	large margin, even though it does all of DNS, tcp-connect and socket I/O	2463	higher level ("unoptimised") abstractions by a large margin, even though
2368	in a non-blocking way.	2464	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2369		2465
2370	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2466	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2371	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2467	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2372	part of the IO::lambda distribution and were used without any changes.	2468	part of the IO::Lambda distribution and were used without any changes.
2373		2469
2374		2470
2375	=head1 SIGNALS	2471	=head1 SIGNALS
2376		2472
2377	AnyEvent currently installs handlers for these signals:	2473	AnyEvent currently installs handlers for these signals:
…		…
2419	it's built-in modules) are required to use it.	2515	it's built-in modules) are required to use it.
2420		2516
2421	That does not mean that AnyEvent won't take advantage of some additional	2517	That does not mean that AnyEvent won't take advantage of some additional
2422	modules if they are installed.	2518	modules if they are installed.
2423		2519
2424	This section epxlains which additional modules will be used, and how they	2520	This section explains which additional modules will be used, and how they
2425	affect AnyEvent's operetion.	2521	affect AnyEvent's operation.
2426		2522
2427	=over 4	2523	=over 4
2428		2524
2429	=item L<Async::Interrupt>	2525	=item L<Async::Interrupt>
2430		2526
…		…
2435	catch the signals) with some delay (default is 10 seconds, look for	2531	catch the signals) with some delay (default is 10 seconds, look for
2436	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2532	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2437		2533
2438	If this module is available, then it will be used to implement signal	2534	If this module is available, then it will be used to implement signal
2439	catching, which means that signals will not be delayed, and the event loop	2535	catching, which means that signals will not be delayed, and the event loop
2440	will not be interrupted regularly, which is more efficient (And good for	2536	will not be interrupted regularly, which is more efficient (and good for
2441	battery life on laptops).	2537	battery life on laptops).
2442		2538
2443	This affects not just the pure-perl event loop, but also other event loops	2539	This affects not just the pure-perl event loop, but also other event loops
2444	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2540	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2445		2541
…		…
2457	automatic timer adjustments even when no monotonic clock is available,	2553	automatic timer adjustments even when no monotonic clock is available,
2458	can take avdantage of advanced kernel interfaces such as C<epoll> and	2554	can take avdantage of advanced kernel interfaces such as C<epoll> and
2459	C<kqueue>, and is the fastest backend I<by far>. You can even embed	2555	C<kqueue>, and is the fastest backend I<by far>. You can even embed
2460	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).	2556	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
2461		2557
		2558	If you only use backends that rely on another event loop (e.g. C<Tk>),
		2559	then this module will do nothing for you.
		2560
2462	=item L<Guard>	2561	=item L<Guard>
2463		2562
2464	The guard module, when used, will be used to implement	2563	The guard module, when used, will be used to implement
2465	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a	2564	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
2466	lot less memory), but otherwise doesn't affect guard operation much. It is	2565	lot less memory), but otherwise doesn't affect guard operation much. It is
2467	purely used for performance.	2566	purely used for performance.
2468		2567
2469	=item L<JSON> and L<JSON::XS>	2568	=item L<JSON> and L<JSON::XS>
2470		2569
2471	This module is required when you want to read or write JSON data via	2570	One of these modules is required when you want to read or write JSON data
2472	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2571	via L<AnyEvent::Handle>. L<JSON> is also written in pure-perl, but can take
2473	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2572	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2474
2475	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2476	installed.
2477		2573
2478	=item L<Net::SSLeay>	2574	=item L<Net::SSLeay>
2479		2575
2480	Implementing TLS/SSL in Perl is certainly interesting, but not very	2576	Implementing TLS/SSL in Perl is certainly interesting, but not very
2481	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with	2577	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
…		…
2492		2588
2493		2589
2494	=head1 FORK	2590	=head1 FORK
2495		2591
2496	Most event libraries are not fork-safe. The ones who are usually are	2592	Most event libraries are not fork-safe. The ones who are usually are
2497	because they rely on inefficient but fork-safe C<select> or C<poll>	2593	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2498	calls. Only L<EV> is fully fork-aware.	2594	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2595	are usually badly thought-out hacks that are incompatible with fork in
		2596	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2597	continue event-processing in both parent and child (or both, if you know
		2598	what you are doing).
		2599
		2600	This means that, in general, you cannot fork and do event processing in
		2601	the child if the event library was initialised before the fork (which
		2602	usually happens when the first AnyEvent watcher is created, or the library
		2603	is loaded).
2499		2604
2500	If you have to fork, you must either do so I<before> creating your first	2605	If you have to fork, you must either do so I<before> creating your first
2501	watcher OR you must not use AnyEvent at all in the child OR you must do	2606	watcher OR you must not use AnyEvent at all in the child OR you must do
2502	something completely out of the scope of AnyEvent.	2607	something completely out of the scope of AnyEvent.
		2608
		2609	The problem of doing event processing in the parent I<and> the child
		2610	is much more complicated: even for backends that I<are> fork-aware or
		2611	fork-safe, their behaviour is not usually what you want: fork clones all
		2612	watchers, that means all timers, I/O watchers etc. are active in both
		2613	parent and child, which is almost never what you want. USing C<exec>
		2614	to start worker children from some kind of manage rprocess is usually
		2615	preferred, because it is much easier and cleaner, at the expense of having
		2616	to have another binary.
2503		2617
2504		2618
2505	=head1 SECURITY CONSIDERATIONS	2619	=head1 SECURITY CONSIDERATIONS
2506		2620
2507	AnyEvent can be forced to load any event model via	2621	AnyEvent can be forced to load any event model via

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.269 by root, Fri Jul 31 20:16:29 2009 UTC vs. Revision 1.329 by root, Sun Jul 11 05:44:22 2010 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.269 by root, Fri Jul 31 20:16:29 2009 UTC vs.
Revision 1.329 by root, Sun Jul 11 05:44:22 2010 UTC