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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.208 by root, Sun Apr 26 18:12:53 2009 UTC vs.
Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - provide framework for multiple event loops	3	AnyEvent - provide framework for multiple event loops
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops	5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported
		6	event loops.
6		7
7	=head1 SYNOPSIS	8	=head1 SYNOPSIS
8		9
9	use AnyEvent;	10	use AnyEvent;
10		11
175	=head2 I/O WATCHERS	176	=head2 I/O WATCHERS
176		177
177	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	178	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
178	with the following mandatory key-value pairs as arguments:	179	with the following mandatory key-value pairs as arguments:
179		180
180	C<fh> is the Perl I<file handle> (I<not> file descriptor) to watch	181	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
181	for events (AnyEvent might or might not keep a reference to this file	182	for events (AnyEvent might or might not keep a reference to this file
182	handle). Note that only file handles pointing to things for which	183	handle). Note that only file handles pointing to things for which
183	non-blocking operation makes sense are allowed. This includes sockets,	184	non-blocking operation makes sense are allowed. This includes sockets,
184	most character devices, pipes, fifos and so on, but not for example files	185	most character devices, pipes, fifos and so on, but not for example files
185	or block devices.	186	or block devices.
…		…
360	invocation, and callback invocation will be synchronous. Synchronous means	361	invocation, and callback invocation will be synchronous. Synchronous means
361	that it might take a while until the signal gets handled by the process,	362	that it might take a while until the signal gets handled by the process,
362	but it is guaranteed not to interrupt any other callbacks.	363	but it is guaranteed not to interrupt any other callbacks.
363		364
364	The main advantage of using these watchers is that you can share a signal	365	The main advantage of using these watchers is that you can share a signal
365	between multiple watchers.	366	between multiple watchers, and AnyEvent will ensure that signals will not
		367	interrupt your program at bad times.
366		368
367	This watcher might use C<%SIG>, so programs overwriting those signals	369	This watcher might use C<%SIG> (depending on the event loop used),
368	directly will likely not work correctly.	370	so programs overwriting those signals directly will likely not work
		371	correctly.
369		372
370	Example: exit on SIGINT	373	Example: exit on SIGINT
371		374
372	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	375	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		376
		377	=head3 Signal Races, Delays and Workarounds
		378
		379	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
		380	callbacks to signals in a generic way, which is a pity, as you cannot do
		381	race-free signal handling in perl. AnyEvent will try to do it's best, but
		382	in some cases, signals will be delayed. The maximum time a signal might
		383	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10
		384	seconds). This variable can be changed only before the first signal
		385	watcher is created, and should be left alone otherwise. Higher values
		386	will cause fewer spurious wake-ups, which is better for power and CPU
		387	saving. All these problems can be avoided by installing the optional
		388	L<Async::Interrupt> module. This will not work with inherently broken
		389	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>
		390	currently, as POE does it's own workaround with one-second latency). With
		391	those, you just have to suffer the delays.
373		392
374	=head2 CHILD PROCESS WATCHERS	393	=head2 CHILD PROCESS WATCHERS
375		394
376	You can also watch on a child process exit and catch its exit status.	395	You can also watch on a child process exit and catch its exit status.
377		396
…		…
391		410
392	There is a slight catch to child watchers, however: you usually start them	411	There is a slight catch to child watchers, however: you usually start them
393	I<after> the child process was created, and this means the process could	412	I<after> the child process was created, and this means the process could
394	have exited already (and no SIGCHLD will be sent anymore).	413	have exited already (and no SIGCHLD will be sent anymore).
395		414
396	Not all event models handle this correctly (POE doesn't), but even for	415	Not all event models handle this correctly (neither POE nor IO::Async do,
		416	see their AnyEvent::Impl manpages for details), but even for event models
397	event models that I<do> handle this correctly, they usually need to be	417	that I<do> handle this correctly, they usually need to be loaded before
398	loaded before the process exits (i.e. before you fork in the first place).	418	the process exits (i.e. before you fork in the first place). AnyEvent's
		419	pure perl event loop handles all cases correctly regardless of when you
		420	start the watcher.
399		421
400	This means you cannot create a child watcher as the very first thing in an	422	This means you cannot create a child watcher as the very first
401	AnyEvent program, you I<have> to create at least one watcher before you	423	thing in an AnyEvent program, you I<have> to create at least one
402	C<fork> the child (alternatively, you can call C<AnyEvent::detect>).	424	watcher before you C<fork> the child (alternatively, you can call
		425	C<AnyEvent::detect>).
		426
		427	As most event loops do not support waiting for child events, they will be
		428	emulated by AnyEvent in most cases, in which the latency and race problems
		429	mentioned in the description of signal watchers apply.
403		430
404	Example: fork a process and wait for it	431	Example: fork a process and wait for it
405		432
406	my $done = AnyEvent->condvar;	433	my $done = AnyEvent->condvar;
407		434
…		…
458		485
459	If you are familiar with some event loops you will know that all of them	486	If you are familiar with some event loops you will know that all of them
460	require you to run some blocking "loop", "run" or similar function that	487	require you to run some blocking "loop", "run" or similar function that
461	will actively watch for new events and call your callbacks.	488	will actively watch for new events and call your callbacks.
462		489
463	AnyEvent is different, it expects somebody else to run the event loop and	490	AnyEvent is slightly different: it expects somebody else to run the event
464	will only block when necessary (usually when told by the user).	491	loop and will only block when necessary (usually when told by the user).
465		492
466	The instrument to do that is called a "condition variable", so called	493	The instrument to do that is called a "condition variable", so called
467	because they represent a condition that must become true.	494	because they represent a condition that must become true.
468		495
		496	Now is probably a good time to look at the examples further below.
		497
469	Condition variables can be created by calling the C<< AnyEvent->condvar	498	Condition variables can be created by calling the C<< AnyEvent->condvar
470	>> method, usually without arguments. The only argument pair allowed is	499	>> method, usually without arguments. The only argument pair allowed is
471
472	C<cb>, which specifies a callback to be called when the condition variable	500	C<cb>, which specifies a callback to be called when the condition variable
473	becomes true, with the condition variable as the first argument (but not	501	becomes true, with the condition variable as the first argument (but not
474	the results).	502	the results).
475		503
476	After creation, the condition variable is "false" until it becomes "true"	504	After creation, the condition variable is "false" until it becomes "true"
…		…
525	after => 1,	553	after => 1,
526	cb => sub { $result_ready->send },	554	cb => sub { $result_ready->send },
527	);	555	);
528		556
529	# this "blocks" (while handling events) till the callback	557	# this "blocks" (while handling events) till the callback
530	# calls send	558	# calls -<send
531	$result_ready->recv;	559	$result_ready->recv;
532		560
533	Example: wait for a timer, but take advantage of the fact that	561	Example: wait for a timer, but take advantage of the fact that condition
534	condition variables are also code references.	562	variables are also callable directly.
535		563
536	my $done = AnyEvent->condvar;	564	my $done = AnyEvent->condvar;
537	my $delay = AnyEvent->timer (after => 5, cb => $done);	565	my $delay = AnyEvent->timer (after => 5, cb => $done);
538	$done->recv;	566	$done->recv;
539		567
…		…
545		573
546	...	574	...
547		575
548	my @info = $couchdb->info->recv;	576	my @info = $couchdb->info->recv;
549		577
550	And this is how you would just ste a callback to be called whenever the	578	And this is how you would just set a callback to be called whenever the
551	results are available:	579	results are available:
552		580
553	$couchdb->info->cb (sub {	581	$couchdb->info->cb (sub {
554	my @info = $_[0]->recv;	582	my @info = $_[0]->recv;
555	});	583	});
…		…
573	immediately from within send.	601	immediately from within send.
574		602
575	Any arguments passed to the C<send> call will be returned by all	603	Any arguments passed to the C<send> call will be returned by all
576	future C<< ->recv >> calls.	604	future C<< ->recv >> calls.
577		605
578	Condition variables are overloaded so one can call them directly	606	Condition variables are overloaded so one can call them directly (as if
579	(as a code reference). Calling them directly is the same as calling	607	they were a code reference). Calling them directly is the same as calling
580	C<send>. Note, however, that many C-based event loops do not handle	608	C<send>.
581	overloading, so as tempting as it may be, passing a condition variable
582	instead of a callback does not work. Both the pure perl and EV loops
583	support overloading, however, as well as all functions that use perl to
584	invoke a callback (as in L<AnyEvent::Socket> and L<AnyEvent::DNS> for
585	example).
586		609
587	=item $cv->croak ($error)	610	=item $cv->croak ($error)
588		611
589	Similar to send, but causes all call's to C<< ->recv >> to invoke	612	Similar to send, but causes all call's to C<< ->recv >> to invoke
590	C<Carp::croak> with the given error message/object/scalar.	613	C<Carp::croak> with the given error message/object/scalar.
591		614
592	This can be used to signal any errors to the condition variable	615	This can be used to signal any errors to the condition variable
593	user/consumer.	616	user/consumer. Doing it this way instead of calling C<croak> directly
		617	delays the error detetcion, but has the overwhelmign advantage that it
		618	diagnoses the error at the place where the result is expected, and not
		619	deep in some event clalback without connection to the actual code causing
		620	the problem.
594		621
595	=item $cv->begin ([group callback])	622	=item $cv->begin ([group callback])
596		623
597	=item $cv->end	624	=item $cv->end
598
599	These two methods are EXPERIMENTAL and MIGHT CHANGE.
600		625
601	These two methods can be used to combine many transactions/events into	626	These two methods can be used to combine many transactions/events into
602	one. For example, a function that pings many hosts in parallel might want	627	one. For example, a function that pings many hosts in parallel might want
603	to use a condition variable for the whole process.	628	to use a condition variable for the whole process.
604		629
…		…
606	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	631	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
607	>>, the (last) callback passed to C<begin> will be executed. That callback	632	>>, the (last) callback passed to C<begin> will be executed. That callback
608	is I<supposed> to call C<< ->send >>, but that is not required. If no	633	is I<supposed> to call C<< ->send >>, but that is not required. If no
609	callback was set, C<send> will be called without any arguments.	634	callback was set, C<send> will be called without any arguments.
610		635
611	Let's clarify this with the ping example:	636	You can think of C<< $cv->send >> giving you an OR condition (one call
		637	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
		638	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
		639
		640	Let's start with a simple example: you have two I/O watchers (for example,
		641	STDOUT and STDERR for a program), and you want to wait for both streams to
		642	close before activating a condvar:
		643
		644	my $cv = AnyEvent->condvar;
		645
		646	$cv->begin; # first watcher
		647	my $w1 = AnyEvent->io (fh => $fh1, cb => sub {
		648	defined sysread $fh1, my $buf, 4096
		649	or $cv->end;
		650	});
		651
		652	$cv->begin; # second watcher
		653	my $w2 = AnyEvent->io (fh => $fh2, cb => sub {
		654	defined sysread $fh2, my $buf, 4096
		655	or $cv->end;
		656	});
		657
		658	$cv->recv;
		659
		660	This works because for every event source (EOF on file handle), there is
		661	one call to C<begin>, so the condvar waits for all calls to C<end> before
		662	sending.
		663
		664	The ping example mentioned above is slightly more complicated, as the
		665	there are results to be passwd back, and the number of tasks that are
		666	begung can potentially be zero:
612		667
613	my $cv = AnyEvent->condvar;	668	my $cv = AnyEvent->condvar;
614		669
615	my %result;	670	my %result;
616	$cv->begin (sub { $cv->send (\%result) });	671	$cv->begin (sub { $cv->send (\%result) });
…		…
636	loop, which serves two important purposes: first, it sets the callback	691	loop, which serves two important purposes: first, it sets the callback
637	to be called once the counter reaches C<0>, and second, it ensures that	692	to be called once the counter reaches C<0>, and second, it ensures that
638	C<send> is called even when C<no> hosts are being pinged (the loop	693	C<send> is called even when C<no> hosts are being pinged (the loop
639	doesn't execute once).	694	doesn't execute once).
640		695
641	This is the general pattern when you "fan out" into multiple subrequests:	696	This is the general pattern when you "fan out" into multiple (but
642	use an outer C<begin>/C<end> pair to set the callback and ensure C<end>	697	potentially none) subrequests: use an outer C<begin>/C<end> pair to set
643	is called at least once, and then, for each subrequest you start, call	698	the callback and ensure C<end> is called at least once, and then, for each
644	C<begin> and for each subrequest you finish, call C<end>.	699	subrequest you start, call C<begin> and for each subrequest you finish,
		700	call C<end>.
645		701
646	=back	702	=back
647		703
648	=head3 METHODS FOR CONSUMERS	704	=head3 METHODS FOR CONSUMERS
649		705
…		…
665	function will call C<croak>.	721	function will call C<croak>.
666		722
667	In list context, all parameters passed to C<send> will be returned,	723	In list context, all parameters passed to C<send> will be returned,
668	in scalar context only the first one will be returned.	724	in scalar context only the first one will be returned.
669		725
		726	Note that doing a blocking wait in a callback is not supported by any
		727	event loop, that is, recursive invocation of a blocking C<< ->recv
		728	>> is not allowed, and the C<recv> call will C<croak> if such a
		729	condition is detected. This condition can be slightly loosened by using
		730	L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from
		731	any thread that doesn't run the event loop itself.
		732
670	Not all event models support a blocking wait - some die in that case	733	Not all event models support a blocking wait - some die in that case
671	(programs might want to do that to stay interactive), so I<if you are	734	(programs might want to do that to stay interactive), so I<if you are
672	using this from a module, never require a blocking wait>, but let the	735	using this from a module, never require a blocking wait>. Instead, let the
673	caller decide whether the call will block or not (for example, by coupling	736	caller decide whether the call will block or not (for example, by coupling
674	condition variables with some kind of request results and supporting	737	condition variables with some kind of request results and supporting
675	callbacks so the caller knows that getting the result will not block,	738	callbacks so the caller knows that getting the result will not block,
676	while still supporting blocking waits if the caller so desires).	739	while still supporting blocking waits if the caller so desires).
677		740
678	Another reason I<never> to C<< ->recv >> in a module is that you cannot
679	sensibly have two C<< ->recv >>'s in parallel, as that would require
680	multiple interpreters or coroutines/threads, none of which C<AnyEvent>
681	can supply.
682
683	The L<Coro> module, however, I<can> and I<does> supply coroutines and, in
684	fact, L<Coro::AnyEvent> replaces AnyEvent's condvars by coroutine-safe
685	versions and also integrates coroutines into AnyEvent, making blocking
686	C<< ->recv >> calls perfectly safe as long as they are done from another
687	coroutine (one that doesn't run the event loop).
688
689	You can ensure that C<< -recv >> never blocks by setting a callback and	741	You can ensure that C<< -recv >> never blocks by setting a callback and
690	only calling C<< ->recv >> from within that callback (or at a later	742	only calling C<< ->recv >> from within that callback (or at a later
691	time). This will work even when the event loop does not support blocking	743	time). This will work even when the event loop does not support blocking
692	waits otherwise.	744	waits otherwise.
693		745
…		…
706	variable itself. Calling C<recv> inside the callback or at any later time	758	variable itself. Calling C<recv> inside the callback or at any later time
707	is guaranteed not to block.	759	is guaranteed not to block.
708		760
709	=back	761	=back
710		762
		763	=head1 SUPPORTED EVENT LOOPS/BACKENDS
		764
		765	The available backend classes are (every class has its own manpage):
		766
		767	=over 4
		768
		769	=item Backends that are autoprobed when no other event loop can be found.
		770
		771	EV is the preferred backend when no other event loop seems to be in
		772	use. If EV is not installed, then AnyEvent will try Event, and, failing
		773	that, will fall back to its own pure-perl implementation, which is
		774	available everywhere as it comes with AnyEvent itself.
		775
		776	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
		777	AnyEvent::Impl::Event based on Event, very stable, few glitches.
		778	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
		779
		780	=item Backends that are transparently being picked up when they are used.
		781
		782	These will be used when they are currently loaded when the first watcher
		783	is created, in which case it is assumed that the application is using
		784	them. This means that AnyEvent will automatically pick the right backend
		785	when the main program loads an event module before anything starts to
		786	create watchers. Nothing special needs to be done by the main program.
		787
		788	AnyEvent::Impl::Glib based on Glib, slow but very stable.
		789	AnyEvent::Impl::Tk based on Tk, very broken.
		790	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
		791	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		792
		793	=item Backends with special needs.
		794
		795	Qt requires the Qt::Application to be instantiated first, but will
		796	otherwise be picked up automatically. As long as the main program
		797	instantiates the application before any AnyEvent watchers are created,
		798	everything should just work.
		799
		800	AnyEvent::Impl::Qt based on Qt.
		801
		802	Support for IO::Async can only be partial, as it is too broken and
		803	architecturally limited to even support the AnyEvent API. It also
		804	is the only event loop that needs the loop to be set explicitly, so
		805	it can only be used by a main program knowing about AnyEvent. See
		806	L<AnyEvent::Impl::Async> for the gory details.
		807
		808	AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed.
		809
		810	=item Event loops that are indirectly supported via other backends.
		811
		812	Some event loops can be supported via other modules:
		813
		814	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.
		815
		816	B<WxWidgets> has no support for watching file handles. However, you can
		817	use WxWidgets through the POE adaptor, as POE has a Wx backend that simply
		818	polls 20 times per second, which was considered to be too horrible to even
		819	consider for AnyEvent.
		820
		821	B<Prima> is not supported as nobody seems to be using it, but it has a POE
		822	backend, so it can be supported through POE.
		823
		824	AnyEvent knows about both L<Prima> and L<Wx>, however, and will try to
		825	load L<POE> when detecting them, in the hope that POE will pick them up,
		826	in which case everything will be automatic.
		827
		828	=back
		829
711	=head1 GLOBAL VARIABLES AND FUNCTIONS	830	=head1 GLOBAL VARIABLES AND FUNCTIONS
712		831
		832	These are not normally required to use AnyEvent, but can be useful to
		833	write AnyEvent extension modules.
		834
713	=over 4	835	=over 4
714		836
715	=item $AnyEvent::MODEL	837	=item $AnyEvent::MODEL
716		838
717	Contains C<undef> until the first watcher is being created. Then it	839	Contains C<undef> until the first watcher is being created, before the
		840	backend has been autodetected.
		841
718	contains the event model that is being used, which is the name of the	842	Afterwards it contains the event model that is being used, which is the
719	Perl class implementing the model. This class is usually one of the	843	name of the Perl class implementing the model. This class is usually one
720	C<AnyEvent::Impl:xxx> modules, but can be any other class in the case	844	of the C<AnyEvent::Impl:xxx> modules, but can be any other class in the
721	AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode>).	845	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it
722		846	will be C<urxvt::anyevent>).
723	The known classes so far are:
724
725	AnyEvent::Impl::EV based on EV (an interface to libev, best choice).
726	AnyEvent::Impl::Event based on Event, second best choice.
727	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
728	AnyEvent::Impl::Glib based on Glib, third-best choice.
729	AnyEvent::Impl::Tk based on Tk, very bad choice.
730	AnyEvent::Impl::Qt based on Qt, cannot be autoprobed (see its docs).
731	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
732	AnyEvent::Impl::POE based on POE, not generic enough for full support.
733
734	There is no support for WxWidgets, as WxWidgets has no support for
735	watching file handles. However, you can use WxWidgets through the
736	POE Adaptor, as POE has a Wx backend that simply polls 20 times per
737	second, which was considered to be too horrible to even consider for
738	AnyEvent. Likewise, other POE backends can be used by AnyEvent by using
739	it's adaptor.
740
741	AnyEvent knows about L<Prima> and L<Wx> and will try to use L<POE> when
742	autodetecting them.
743		847
744	=item AnyEvent::detect	848	=item AnyEvent::detect
745		849
746	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	850	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
747	if necessary. You should only call this function right before you would	851	if necessary. You should only call this function right before you would
748	have created an AnyEvent watcher anyway, that is, as late as possible at	852	have created an AnyEvent watcher anyway, that is, as late as possible at
749	runtime.	853	runtime, and not e.g. while initialising of your module.
		854
		855	If you need to do some initialisation before AnyEvent watchers are
		856	created, use C<post_detect>.
750		857
751	=item $guard = AnyEvent::post_detect { BLOCK }	858	=item $guard = AnyEvent::post_detect { BLOCK }
752		859
753	Arranges for the code block to be executed as soon as the event model is	860	Arranges for the code block to be executed as soon as the event model is
754	autodetected (or immediately if this has already happened).	861	autodetected (or immediately if this has already happened).
		862
		863	The block will be executed I<after> the actual backend has been detected
		864	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been
		865	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do
		866	other initialisations - see the sources of L<AnyEvent::Strict> or
		867	L<AnyEvent::AIO> to see how this is used.
		868
		869	The most common usage is to create some global watchers, without forcing
		870	event module detection too early, for example, L<AnyEvent::AIO> creates
		871	and installs the global L<IO::AIO> watcher in a C<post_detect> block to
		872	avoid autodetecting the event module at load time.
755		873
756	If called in scalar or list context, then it creates and returns an object	874	If called in scalar or list context, then it creates and returns an object
757	that automatically removes the callback again when it is destroyed. See	875	that automatically removes the callback again when it is destroyed. See
758	L<Coro::BDB> for a case where this is useful.	876	L<Coro::BDB> for a case where this is useful.
759		877
…		…
762	If there are any code references in this array (you can C<push> to it	880	If there are any code references in this array (you can C<push> to it
763	before or after loading AnyEvent), then they will called directly after	881	before or after loading AnyEvent), then they will called directly after
764	the event loop has been chosen.	882	the event loop has been chosen.
765		883
766	You should check C<$AnyEvent::MODEL> before adding to this array, though:	884	You should check C<$AnyEvent::MODEL> before adding to this array, though:
767	if it contains a true value then the event loop has already been detected,	885	if it is defined then the event loop has already been detected, and the
768	and the array will be ignored.	886	array will be ignored.
769		887
770	Best use C<AnyEvent::post_detect { BLOCK }> instead.	888	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
		889	it,as it takes care of these details.
		890
		891	This variable is mainly useful for modules that can do something useful
		892	when AnyEvent is used and thus want to know when it is initialised, but do
		893	not need to even load it by default. This array provides the means to hook
		894	into AnyEvent passively, without loading it.
771		895
772	=back	896	=back
773		897
774	=head1 WHAT TO DO IN A MODULE	898	=head1 WHAT TO DO IN A MODULE
775		899
…		…
830		954
831		955
832	=head1 OTHER MODULES	956	=head1 OTHER MODULES
833		957
834	The following is a non-exhaustive list of additional modules that use	958	The following is a non-exhaustive list of additional modules that use
835	AnyEvent and can therefore be mixed easily with other AnyEvent modules	959	AnyEvent as a client and can therefore be mixed easily with other AnyEvent
836	in the same program. Some of the modules come with AnyEvent, some are	960	modules and other event loops in the same program. Some of the modules
837	available via CPAN.	961	come with AnyEvent, most are available via CPAN.
838		962
839	=over 4	963	=over 4
840		964
841	=item L<AnyEvent::Util>	965	=item L<AnyEvent::Util>
842		966
…		…
851		975
852	=item L<AnyEvent::Handle>	976	=item L<AnyEvent::Handle>
853		977
854	Provide read and write buffers, manages watchers for reads and writes,	978	Provide read and write buffers, manages watchers for reads and writes,
855	supports raw and formatted I/O, I/O queued and fully transparent and	979	supports raw and formatted I/O, I/O queued and fully transparent and
856	non-blocking SSL/TLS.	980	non-blocking SSL/TLS (via L<AnyEvent::TLS>.
857		981
858	=item L<AnyEvent::DNS>	982	=item L<AnyEvent::DNS>
859		983
860	Provides rich asynchronous DNS resolver capabilities.	984	Provides rich asynchronous DNS resolver capabilities.
861		985
…		…
889		1013
890	=item L<AnyEvent::GPSD>	1014	=item L<AnyEvent::GPSD>
891		1015
892	A non-blocking interface to gpsd, a daemon delivering GPS information.	1016	A non-blocking interface to gpsd, a daemon delivering GPS information.
893		1017
		1018	=item L<AnyEvent::IRC>
		1019
		1020	AnyEvent based IRC client module family (replacing the older Net::IRC3).
		1021
		1022	=item L<AnyEvent::XMPP>
		1023
		1024	AnyEvent based XMPP (Jabber protocol) module family (replacing the older
		1025	Net::XMPP2>.
		1026
894	=item L<AnyEvent::IGS>	1027	=item L<AnyEvent::IGS>
895		1028
896	A non-blocking interface to the Internet Go Server protocol (used by	1029	A non-blocking interface to the Internet Go Server protocol (used by
897	L<App::IGS>).	1030	L<App::IGS>).
898		1031
899	=item L<AnyEvent::IRC>
900
901	AnyEvent based IRC client module family (replacing the older Net::IRC3).
902
903	=item L<Net::XMPP2>
904
905	AnyEvent based XMPP (Jabber protocol) module family.
906
907	=item L<Net::FCP>	1032	=item L<Net::FCP>
908		1033
909	AnyEvent-based implementation of the Freenet Client Protocol, birthplace	1034	AnyEvent-based implementation of the Freenet Client Protocol, birthplace
910	of AnyEvent.	1035	of AnyEvent.
911		1036
…		…
915		1040
916	=item L<Coro>	1041	=item L<Coro>
917		1042
918	Has special support for AnyEvent via L<Coro::AnyEvent>.	1043	Has special support for AnyEvent via L<Coro::AnyEvent>.
919		1044
920	=item L<IO::Lambda>
921
922	The lambda approach to I/O - don't ask, look there. Can use AnyEvent.
923
924	=back	1045	=back
925		1046
926	=cut	1047	=cut
927		1048
928	package AnyEvent;	1049	package AnyEvent;
929		1050
		1051	# basically a tuned-down version of common::sense
		1052	sub common_sense {
930	no warnings;	1053	# no warnings
		1054	${^WARNING_BITS} ^= ${^WARNING_BITS};
931	use strict qw(vars subs);	1055	# use strict vars subs
		1056	$^H \|= 0x00000600;
		1057	}
932		1058
		1059	BEGIN { AnyEvent::common_sense }
		1060
933	use Carp;	1061	use Carp ();
934		1062
935	our $VERSION = 4.4;	1063	our $VERSION = 4.85;
936	our $MODEL;	1064	our $MODEL;
937		1065
938	our $AUTOLOAD;	1066	our $AUTOLOAD;
939	our @ISA;	1067	our @ISA;
940		1068
941	our @REGISTRY;	1069	our @REGISTRY;
942		1070
943	our $WIN32;	1071	our $WIN32;
944		1072
		1073	our $VERBOSE;
		1074
945	BEGIN {	1075	BEGIN {
946	my $win32 = ! ! ($^O =~ /mswin32/i);	1076	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
947	eval "sub WIN32(){ $win32 }";	1077	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";
948	}
949		1078
		1079	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
		1080	if ${^TAINT};
		1081
950	our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1082	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
		1083
		1084	}
		1085
		1086	our $MAX_SIGNAL_LATENCY = 10;
951		1087
952	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1088	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
953		1089
954	{	1090	{
955	my $idx;	1091	my $idx;
…		…
963	[Event:: => AnyEvent::Impl::Event::],	1099	[Event:: => AnyEvent::Impl::Event::],
964	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1100	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],
965	# everything below here will not be autoprobed	1101	# everything below here will not be autoprobed
966	# as the pureperl backend should work everywhere	1102	# as the pureperl backend should work everywhere
967	# and is usually faster	1103	# and is usually faster
968	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
969	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1104	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
970	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1105	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1106	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
971	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1107	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
972	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1108	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
973	[Wx:: => AnyEvent::Impl::POE::],	1109	[Wx:: => AnyEvent::Impl::POE::],
974	[Prima:: => AnyEvent::Impl::POE::],	1110	[Prima:: => AnyEvent::Impl::POE::],
		1111	# IO::Async is just too broken - we would need workarounds for its
		1112	# byzantine signal and broken child handling, among others.
		1113	# IO::Async is rather hard to detect, as it doesn't have any
		1114	# obvious default class.
		1115	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1116	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1117	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
975	);	1118	);
976		1119
977	our %method = map +($_ => 1),	1120	our %method = map +($_ => 1),
978	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1121	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
979		1122
…		…
999	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1142	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1000	}	1143	}
1001		1144
1002	sub detect() {	1145	sub detect() {
1003	unless ($MODEL) {	1146	unless ($MODEL) {
1004	no strict 'refs';
1005	local $SIG{__DIE__};	1147	local $SIG{__DIE__};
1006		1148
1007	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1149	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
1008	my $model = "AnyEvent::Impl::$1";	1150	my $model = "AnyEvent::Impl::$1";
1009	if (eval "require $model") {	1151	if (eval "require $model") {
1010	$MODEL = $model;	1152	$MODEL = $model;
1011	warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1;	1153	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1012	} else {	1154	} else {
1013	warn "AnyEvent: unable to load model '$model' (from \$PERL_ANYEVENT_MODEL):\n$@" if $verbose;	1155	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
1014	}	1156	}
1015	}	1157	}
1016		1158
1017	# check for already loaded models	1159	# check for already loaded models
1018	unless ($MODEL) {	1160	unless ($MODEL) {
1019	for (@REGISTRY, @models) {	1161	for (@REGISTRY, @models) {
1020	my ($package, $model) = @$_;	1162	my ($package, $model) = @$_;
1021	if (${"$package\::VERSION"} > 0) {	1163	if (${"$package\::VERSION"} > 0) {
1022	if (eval "require $model") {	1164	if (eval "require $model") {
1023	$MODEL = $model;	1165	$MODEL = $model;
1024	warn "AnyEvent: autodetected model '$model', using it.\n" if $verbose > 1;	1166	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1025	last;	1167	last;
1026	}	1168	}
1027	}	1169	}
1028	}	1170	}
1029		1171
…		…
1034	my ($package, $model) = @$_;	1176	my ($package, $model) = @$_;
1035	if (eval "require $package"	1177	if (eval "require $package"
1036	and ${"$package\::VERSION"} > 0	1178	and ${"$package\::VERSION"} > 0
1037	and eval "require $model") {	1179	and eval "require $model") {
1038	$MODEL = $model;	1180	$MODEL = $model;
1039	warn "AnyEvent: autoprobed model '$model', using it.\n" if $verbose > 1;	1181	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;
1040	last;	1182	last;
1041	}	1183	}
1042	}	1184	}
1043		1185
1044	$MODEL	1186	$MODEL
…		…
1060		1202
1061	sub AUTOLOAD {	1203	sub AUTOLOAD {
1062	(my $func = $AUTOLOAD) =~ s/.*://;	1204	(my $func = $AUTOLOAD) =~ s/.*://;
1063		1205
1064	$method{$func}	1206	$method{$func}
1065	or croak "$func: not a valid method for AnyEvent objects";	1207	or Carp::croak "$func: not a valid method for AnyEvent objects";
1066		1208
1067	detect unless $MODEL;	1209	detect unless $MODEL;
1068		1210
1069	my $class = shift;	1211	my $class = shift;
1070	$class->$func (@_);	1212	$class->$func (@_);
1071	}	1213	}
1072		1214
1073	# utility function to dup a filehandle. this is used by many backends	1215	# utility function to dup a filehandle. this is used by many backends
1074	# to support binding more than one watcher per filehandle (they usually	1216	# to support binding more than one watcher per filehandle (they usually
1075	# allow only one watcher per fd, so we dup it to get a different one).	1217	# allow only one watcher per fd, so we dup it to get a different one).
1076	sub _dupfh($$$$) {	1218	sub _dupfh($$;$$) {
1077	my ($poll, $fh, $r, $w) = @_;	1219	my ($poll, $fh, $r, $w) = @_;
1078		1220
1079	# cygwin requires the fh mode to be matching, unix doesn't	1221	# cygwin requires the fh mode to be matching, unix doesn't
1080	my ($rw, $mode) = $poll eq "r" ? ($r, "<")	1222	my ($rw, $mode) = $poll eq "r" ? ($r, "<&") : ($w, ">&");
1081	: $poll eq "w" ? ($w, ">")
1082	: Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'";
1083		1223
1084	open my $fh2, "$mode&" . fileno $fh	1224	open my $fh2, $mode, $fh
1085	or die "cannot dup() filehandle: $!,";	1225	or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,";
1086		1226
1087	# we assume CLOEXEC is already set by perl in all important cases	1227	# we assume CLOEXEC is already set by perl in all important cases
1088		1228
1089	($fh2, $rw)	1229	($fh2, $rw)
1090	}	1230	}
1091		1231
1092	package AnyEvent::Base;	1232	package AnyEvent::Base;
1093		1233
1094	# default implementations for many methods	1234	# default implementations for many methods
1095		1235
1096	BEGIN {	1236	sub _time {
		1237	# probe for availability of Time::HiRes
1097	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1238	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
		1239	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1098	*_time = \&Time::HiRes::time;	1240	*_time = \&Time::HiRes::time;
1099	# if (eval "use POSIX (); (POSIX::times())...	1241	# if (eval "use POSIX (); (POSIX::times())...
1100	} else {	1242	} else {
		1243	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1101	*_time = sub { time }; # epic fail	1244	*_time = sub { time }; # epic fail
1102	}	1245	}
		1246
		1247	&_time
1103	}	1248	}
1104		1249
1105	sub time { _time }	1250	sub time { _time }
1106	sub now { _time }	1251	sub now { _time }
1107	sub now_update { }	1252	sub now_update { }
…		…
1112	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1257	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
1113	}	1258	}
1114		1259
1115	# default implementation for ->signal	1260	# default implementation for ->signal
1116		1261
		1262	our $HAVE_ASYNC_INTERRUPT;
1117	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1263	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
		1264	our (%SIG_ASY, %SIG_ASY_W);
		1265	our ($SIG_COUNT, $SIG_TW);
1118		1266
1119	sub _signal_exec {	1267	sub _signal_exec {
		1268	$HAVE_ASYNC_INTERRUPT
		1269	? $SIGPIPE_R->drain
1120	sysread $SIGPIPE_R, my $dummy, 4;	1270	: sysread $SIGPIPE_R, my $dummy, 9;
1121		1271
1122	while (%SIG_EV) {	1272	while (%SIG_EV) {
1123	for (keys %SIG_EV) {	1273	for (keys %SIG_EV) {
1124	delete $SIG_EV{$_};	1274	delete $SIG_EV{$_};
1125	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1275	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1126	}	1276	}
1127	}	1277	}
1128	}	1278	}
1129		1279
		1280	# install a dumym wakeupw atcher to reduce signal catching latency
		1281	sub _sig_add() {
		1282	unless ($SIG_COUNT++) {
		1283	# try to align timer on a full-second boundary, if possible
		1284	my $NOW = AnyEvent->now;
		1285
		1286	$SIG_TW = AnyEvent->timer (
		1287	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
		1288	interval => $MAX_SIGNAL_LATENCY,
		1289	cb => sub { }, # just for the PERL_ASYNC_CHECK
		1290	);
		1291	}
		1292	}
		1293
		1294	sub _sig_del {
		1295	undef $SIG_TW
		1296	unless --$SIG_COUNT;
		1297	}
		1298
		1299	sub _signal {
		1300	my (undef, %arg) = @_;
		1301
		1302	my $signal = uc $arg{signal}
		1303	or Carp::croak "required option 'signal' is missing";
		1304
		1305	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1306
		1307	if ($HAVE_ASYNC_INTERRUPT) {
		1308	# async::interrupt
		1309
		1310	$SIG_ASY{$signal} \|\|= do {
		1311	my $asy = new Async::Interrupt
		1312	cb => sub { undef $SIG_EV{$signal} },
		1313	signal => $signal,
		1314	pipe => [$SIGPIPE_R->filenos],
		1315	;
		1316	$asy->pipe_autodrain (0);
		1317
		1318	$asy
		1319	};
		1320
		1321	} else {
		1322	# pure perl
		1323
		1324	$SIG{$signal} \|\|= sub {
		1325	local $!;
		1326	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1327	undef $SIG_EV{$signal};
		1328	};
		1329
		1330	# can't do signal processing without introducing races in pure perl,
		1331	# so limit the signal latency.
		1332	_sig_add;
		1333	}
		1334
		1335	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1336	}
		1337
1130	sub signal {	1338	sub signal {
1131	my (undef, %arg) = @_;	1339	# probe for availability of Async::Interrupt
		1340	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
		1341	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1132		1342
1133	unless ($SIGPIPE_R) {	1343	$HAVE_ASYNC_INTERRUPT = 1;
		1344	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1345	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
		1346
		1347	} else {
		1348	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1349
1134	require Fcntl;	1350	require Fcntl;
1135		1351
1136	if (AnyEvent::WIN32) {	1352	if (AnyEvent::WIN32) {
1137	require AnyEvent::Util;	1353	require AnyEvent::Util;
1138		1354
…		…
1141	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case	1357	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1142	} else {	1358	} else {
1143	pipe $SIGPIPE_R, $SIGPIPE_W;	1359	pipe $SIGPIPE_R, $SIGPIPE_W;
1144	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;	1360	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1145	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case	1361	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1362
		1363	# not strictly required, as $^F is normally 2, but let's make sure...
		1364	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1365	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1146	}	1366	}
1147		1367
1148	$SIGPIPE_R	1368	$SIGPIPE_R
1149	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1369	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1150		1370
1151	# not strictly required, as $^F is normally 2, but let's make sure...
1152	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1153	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1154
1155	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);	1371	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1156	}	1372	}
1157		1373
1158	my $signal = uc $arg{signal}	1374	*signal = \&_signal;
1159	or Carp::croak "required option 'signal' is missing";	1375	&signal
1160
1161	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1162	$SIG{$signal} \|\|= sub {
1163	local $!;
1164	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1165	undef $SIG_EV{$signal};
1166	};
1167
1168	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1169	}	1376	}
1170		1377
1171	sub AnyEvent::Base::signal::DESTROY {	1378	sub AnyEvent::Base::signal::DESTROY {
1172	my ($signal, $cb) = @{$_[0]};	1379	my ($signal, $cb) = @{$_[0]};
1173		1380
		1381	_sig_del;
		1382
1174	delete $SIG_CB{$signal}{$cb};	1383	delete $SIG_CB{$signal}{$cb};
1175		1384
		1385	$HAVE_ASYNC_INTERRUPT
		1386	? delete $SIG_ASY{$signal}
		1387	: # delete doesn't work with older perls - they then
		1388	# print weird messages, or just unconditionally exit
		1389	# instead of getting the default action.
		1390	undef $SIG{$signal}
1176	delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} };	1391	unless keys %{ $SIG_CB{$signal} };
1177	}	1392	}
1178		1393
1179	# default implementation for ->child	1394	# default implementation for ->child
1180		1395
1181	our %PID_CB;	1396	our %PID_CB;
1182	our $CHLD_W;	1397	our $CHLD_W;
1183	our $CHLD_DELAY_W;	1398	our $CHLD_DELAY_W;
1184	our $PID_IDLE;
1185	our $WNOHANG;	1399	our $WNOHANG;
1186		1400
1187	sub _child_wait {	1401	sub _sigchld {
1188	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1402	while (0 < (my $pid = waitpid -1, $WNOHANG)) {
		1403	$_->($pid, $?)
1189	$_->($pid, $?) for (values %{ $PID_CB{$pid} \|\| {} }),	1404	for values %{ $PID_CB{$pid} \|\| {} },
1190	(values %{ $PID_CB{0} \|\| {} });	1405	values %{ $PID_CB{0} \|\| {} };
1191	}	1406	}
1192
1193	undef $PID_IDLE;
1194	}
1195
1196	sub _sigchld {
1197	# make sure we deliver these changes "synchronous" with the event loop.
1198	$CHLD_DELAY_W \|\|= AnyEvent->timer (after => 0, cb => sub {
1199	undef $CHLD_DELAY_W;
1200	&_child_wait;
1201	});
1202	}	1407	}
1203		1408
1204	sub child {	1409	sub child {
1205	my (undef, %arg) = @_;	1410	my (undef, %arg) = @_;
1206		1411
1207	defined (my $pid = $arg{pid} + 0)	1412	defined (my $pid = $arg{pid} + 0)
1208	or Carp::croak "required option 'pid' is missing";	1413	or Carp::croak "required option 'pid' is missing";
1209		1414
1210	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1415	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1211		1416
1212	unless ($WNOHANG) {	1417	# WNOHANG is almost cetrainly 1 everywhere
		1418	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
		1419	? 1
1213	$WNOHANG = eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1420	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1214	}
1215		1421
1216	unless ($CHLD_W) {	1422	unless ($CHLD_W) {
1217	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1423	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);
1218	# child could be a zombie already, so make at least one round	1424	# child could be a zombie already, so make at least one round
1219	&_sigchld;	1425	&_sigchld;
…		…
1230		1436
1231	undef $CHLD_W unless keys %PID_CB;	1437	undef $CHLD_W unless keys %PID_CB;
1232	}	1438	}
1233		1439
1234	# idle emulation is done by simply using a timer, regardless	1440	# idle emulation is done by simply using a timer, regardless
1235	# of whether the proces sis idle or not, and not letting	1441	# of whether the process is idle or not, and not letting
1236	# the callback use more than 50% of the time.	1442	# the callback use more than 50% of the time.
1237	sub idle {	1443	sub idle {
1238	my (undef, %arg) = @_;	1444	my (undef, %arg) = @_;
1239		1445
1240	my ($cb, $w, $rcb) = $arg{cb};	1446	my ($cb, $w, $rcb) = $arg{cb};
…		…
1271		1477
1272	our @ISA = AnyEvent::CondVar::Base::;	1478	our @ISA = AnyEvent::CondVar::Base::;
1273		1479
1274	package AnyEvent::CondVar::Base;	1480	package AnyEvent::CondVar::Base;
1275		1481
1276	use overload	1482	#use overload
1277	'&{}' => sub { my $self = shift; sub { $self->send (@_) } },	1483	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },
1278	fallback => 1;	1484	# fallback => 1;
		1485
		1486	# save 300+ kilobytes by dirtily hardcoding overloading
		1487	${"AnyEvent::CondVar::Base::OVERLOAD"}{dummy}++; # Register with magic by touching.
		1488	*{'AnyEvent::CondVar::Base::()'} = sub { }; # "Make it findable via fetchmethod."
		1489	*{'AnyEvent::CondVar::Base::(&{}'} = sub { my $self = shift; sub { $self->send (@_) } }; # &{}
		1490	${'AnyEvent::CondVar::Base::()'} = 1; # fallback
		1491
		1492	our $WAITING;
1279		1493
1280	sub _send {	1494	sub _send {
1281	# nop	1495	# nop
1282	}	1496	}
1283		1497
…		…
1296	sub ready {	1510	sub ready {
1297	$_[0]{_ae_sent}	1511	$_[0]{_ae_sent}
1298	}	1512	}
1299		1513
1300	sub _wait {	1514	sub _wait {
		1515	$WAITING
		1516	and !$_[0]{_ae_sent}
		1517	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
		1518
		1519	local $WAITING = 1;
1301	AnyEvent->one_event while !$_[0]{_ae_sent};	1520	AnyEvent->one_event while !$_[0]{_ae_sent};
1302	}	1521	}
1303		1522
1304	sub recv {	1523	sub recv {
1305	$_[0]->_wait;	1524	$_[0]->_wait;
…		…
1346	so on.	1565	so on.
1347		1566
1348	=head1 ENVIRONMENT VARIABLES	1567	=head1 ENVIRONMENT VARIABLES
1349		1568
1350	The following environment variables are used by this module or its	1569	The following environment variables are used by this module or its
1351	submodules:	1570	submodules.
		1571
		1572	Note that AnyEvent will remove I<all> environment variables starting with
		1573	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is
		1574	enabled.
1352		1575
1353	=over 4	1576	=over 4
1354		1577
1355	=item C<PERL_ANYEVENT_VERBOSE>	1578	=item C<PERL_ANYEVENT_VERBOSE>
1356		1579
…		…
1363	C<PERL_ANYEVENT_MODEL>.	1586	C<PERL_ANYEVENT_MODEL>.
1364		1587
1365	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	1588	When set to C<2> or higher, cause AnyEvent to report to STDERR which event
1366	model it chooses.	1589	model it chooses.
1367		1590
		1591	When set to C<8> or higher, then AnyEvent will report extra information on
		1592	which optional modules it loads and how it implements certain features.
		1593
1368	=item C<PERL_ANYEVENT_STRICT>	1594	=item C<PERL_ANYEVENT_STRICT>
1369		1595
1370	AnyEvent does not do much argument checking by default, as thorough	1596	AnyEvent does not do much argument checking by default, as thorough
1371	argument checking is very costly. Setting this variable to a true value	1597	argument checking is very costly. Setting this variable to a true value
1372	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly	1598	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly
1373	check the arguments passed to most method calls. If it finds any problems	1599	check the arguments passed to most method calls. If it finds any problems,
1374	it will croak.	1600	it will croak.
1375		1601
1376	In other words, enables "strict" mode.	1602	In other words, enables "strict" mode.
1377		1603
1378	Unlike C<use strict>, it is definitely recommended ot keep it off in	1604	Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense>
1379	production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while	1605	>>, it is definitely recommended to keep it off in production. Keeping
1380	developing programs can be very useful, however.	1606	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
		1607	can be very useful, however.
1381		1608
1382	=item C<PERL_ANYEVENT_MODEL>	1609	=item C<PERL_ANYEVENT_MODEL>
1383		1610
1384	This can be used to specify the event model to be used by AnyEvent, before	1611	This can be used to specify the event model to be used by AnyEvent, before
1385	auto detection and -probing kicks in. It must be a string consisting	1612	auto detection and -probing kicks in. It must be a string consisting
…		…
1428		1655
1429	=item C<PERL_ANYEVENT_MAX_FORKS>	1656	=item C<PERL_ANYEVENT_MAX_FORKS>
1430		1657
1431	The maximum number of child processes that C<AnyEvent::Util::fork_call>	1658	The maximum number of child processes that C<AnyEvent::Util::fork_call>
1432	will create in parallel.	1659	will create in parallel.
		1660
		1661	=item C<PERL_ANYEVENT_MAX_OUTSTANDING_DNS>
		1662
		1663	The default value for the C<max_outstanding> parameter for the default DNS
		1664	resolver - this is the maximum number of parallel DNS requests that are
		1665	sent to the DNS server.
		1666
		1667	=item C<PERL_ANYEVENT_RESOLV_CONF>
		1668
		1669	The file to use instead of F</etc/resolv.conf> (or OS-specific
		1670	configuration) in the default resolver. When set to the empty string, no
		1671	default config will be used.
		1672
		1673	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
		1674
		1675	When neither C<ca_file> nor C<ca_path> was specified during
		1676	L<AnyEvent::TLS> context creation, and either of these environment
		1677	variables exist, they will be used to specify CA certificate locations
		1678	instead of a system-dependent default.
		1679
		1680	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
		1681
		1682	When these are set to C<1>, then the respective modules are not
		1683	loaded. Mostly good for testing AnyEvent itself.
1433		1684
1434	=back	1685	=back
1435		1686
1436	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE	1687	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE
1437		1688
…		…
1682	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	1933	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers
1683	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	1934	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal
1684	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	1935	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation
1685	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	1936	Event/Event 16000 517 32.20 31.80 0.81 Event native interface
1686	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	1937	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers
		1938	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll
		1939	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll
1687	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	1940	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour
1688	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	1941	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers
1689	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	1942	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event
1690	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	1943	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select
1691		1944
…		…
1720	performance becomes really bad with lots of file descriptors (and few of	1973	performance becomes really bad with lots of file descriptors (and few of
1721	them active), of course, but this was not subject of this benchmark.	1974	them active), of course, but this was not subject of this benchmark.
1722		1975
1723	The C<Event> module has a relatively high setup and callback invocation	1976	The C<Event> module has a relatively high setup and callback invocation
1724	cost, but overall scores in on the third place.	1977	cost, but overall scores in on the third place.
		1978
		1979	C<IO::Async> performs admirably well, about on par with C<Event>, even
		1980	when using its pure perl backend.
1725		1981
1726	C<Glib>'s memory usage is quite a bit higher, but it features a	1982	C<Glib>'s memory usage is quite a bit higher, but it features a
1727	faster callback invocation and overall ends up in the same class as	1983	faster callback invocation and overall ends up in the same class as
1728	C<Event>. However, Glib scales extremely badly, doubling the number of	1984	C<Event>. However, Glib scales extremely badly, doubling the number of
1729	watchers increases the processing time by more than a factor of four,	1985	watchers increases the processing time by more than a factor of four,
…		…
1807	it to another server. This includes deleting the old timeout and creating	2063	it to another server. This includes deleting the old timeout and creating
1808	a new one that moves the timeout into the future.	2064	a new one that moves the timeout into the future.
1809		2065
1810	=head3 Results	2066	=head3 Results
1811		2067
1812	name sockets create request	2068	name sockets create request
1813	EV 20000 69.01 11.16	2069	EV 20000 69.01 11.16
1814	Perl 20000 73.32 35.87	2070	Perl 20000 73.32 35.87
		2071	IOAsync 20000 157.00 98.14 epoll
		2072	IOAsync 20000 159.31 616.06 poll
1815	Event 20000 212.62 257.32	2073	Event 20000 212.62 257.32
1816	Glib 20000 651.16 1896.30	2074	Glib 20000 651.16 1896.30
1817	POE 20000 349.67 12317.24 uses POE::Loop::Event	2075	POE 20000 349.67 12317.24 uses POE::Loop::Event
1818		2076
1819	=head3 Discussion	2077	=head3 Discussion
1820		2078
1821	This benchmark I<does> measure scalability and overall performance of the	2079	This benchmark I<does> measure scalability and overall performance of the
1822	particular event loop.	2080	particular event loop.
…		…
1824	EV is again fastest. Since it is using epoll on my system, the setup time	2082	EV is again fastest. Since it is using epoll on my system, the setup time
1825	is relatively high, though.	2083	is relatively high, though.
1826		2084
1827	Perl surprisingly comes second. It is much faster than the C-based event	2085	Perl surprisingly comes second. It is much faster than the C-based event
1828	loops Event and Glib.	2086	loops Event and Glib.
		2087
		2088	IO::Async performs very well when using its epoll backend, and still quite
		2089	good compared to Glib when using its pure perl backend.
1829		2090
1830	Event suffers from high setup time as well (look at its code and you will	2091	Event suffers from high setup time as well (look at its code and you will
1831	understand why). Callback invocation also has a high overhead compared to	2092	understand why). Callback invocation also has a high overhead compared to
1832	the C<< $_->() for .. >>-style loop that the Perl event loop uses. Event	2093	the C<< $_->() for .. >>-style loop that the Perl event loop uses. Event
1833	uses select or poll in basically all documented configurations.	2094	uses select or poll in basically all documented configurations.
…		…
1896	=item * C-based event loops perform very well with small number of	2157	=item * C-based event loops perform very well with small number of
1897	watchers, as the management overhead dominates.	2158	watchers, as the management overhead dominates.
1898		2159
1899	=back	2160	=back
1900		2161
		2162	=head2 THE IO::Lambda BENCHMARK
		2163
		2164	Recently I was told about the benchmark in the IO::Lambda manpage, which
		2165	could be misinterpreted to make AnyEvent look bad. In fact, the benchmark
		2166	simply compares IO::Lambda with POE, and IO::Lambda looks better (which
		2167	shouldn't come as a surprise to anybody). As such, the benchmark is
		2168	fine, and mostly shows that the AnyEvent backend from IO::Lambda isn't
		2169	very optimal. But how would AnyEvent compare when used without the extra
		2170	baggage? To explore this, I wrote the equivalent benchmark for AnyEvent.
		2171
		2172	The benchmark itself creates an echo-server, and then, for 500 times,
		2173	connects to the echo server, sends a line, waits for the reply, and then
		2174	creates the next connection. This is a rather bad benchmark, as it doesn't
		2175	test the efficiency of the framework or much non-blocking I/O, but it is a
		2176	benchmark nevertheless.
		2177
		2178	name runtime
		2179	Lambda/select 0.330 sec
		2180	+ optimized 0.122 sec
		2181	Lambda/AnyEvent 0.327 sec
		2182	+ optimized 0.138 sec
		2183	Raw sockets/select 0.077 sec
		2184	POE/select, components 0.662 sec
		2185	POE/select, raw sockets 0.226 sec
		2186	POE/select, optimized 0.404 sec
		2187
		2188	AnyEvent/select/nb 0.085 sec
		2189	AnyEvent/EV/nb 0.068 sec
		2190	+state machine 0.134 sec
		2191
		2192	The benchmark is also a bit unfair (my fault): the IO::Lambda/POE
		2193	benchmarks actually make blocking connects and use 100% blocking I/O,
		2194	defeating the purpose of an event-based solution. All of the newly
		2195	written AnyEvent benchmarks use 100% non-blocking connects (using
		2196	AnyEvent::Socket::tcp_connect and the asynchronous pure perl DNS
		2197	resolver), so AnyEvent is at a disadvantage here, as non-blocking connects
		2198	generally require a lot more bookkeeping and event handling than blocking
		2199	connects (which involve a single syscall only).
		2200
		2201	The last AnyEvent benchmark additionally uses L<AnyEvent::Handle>, which
		2202	offers similar expressive power as POE and IO::Lambda, using conventional
		2203	Perl syntax. This means that both the echo server and the client are 100%
		2204	non-blocking, further placing it at a disadvantage.
		2205
		2206	As you can see, the AnyEvent + EV combination even beats the
		2207	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
		2208	backend easily beats IO::Lambda and POE.
		2209
		2210	And even the 100% non-blocking version written using the high-level (and
		2211	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a
		2212	large margin, even though it does all of DNS, tcp-connect and socket I/O
		2213	in a non-blocking way.
		2214
		2215	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
		2216	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
		2217	part of the IO::lambda distribution and were used without any changes.
		2218
1901		2219
1902	=head1 SIGNALS	2220	=head1 SIGNALS
1903		2221
1904	AnyEvent currently installs handlers for these signals:	2222	AnyEvent currently installs handlers for these signals:
1905		2223
…		…
1908	=item SIGCHLD	2226	=item SIGCHLD
1909		2227
1910	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher	2228	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher
1911	emulation for event loops that do not support them natively. Also, some	2229	emulation for event loops that do not support them natively. Also, some
1912	event loops install a similar handler.	2230	event loops install a similar handler.
		2231
		2232	Additionally, when AnyEvent is loaded and SIGCHLD is set to IGNORE, then
		2233	AnyEvent will reset it to default, to avoid losing child exit statuses.
1913		2234
1914	=item SIGPIPE	2235	=item SIGPIPE
1915		2236
1916	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>	2237	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>
1917	when AnyEvent gets loaded.	2238	when AnyEvent gets loaded.
…		…
1929		2250
1930	=back	2251	=back
1931		2252
1932	=cut	2253	=cut
1933		2254
		2255	undef $SIG{CHLD}
		2256	if $SIG{CHLD} eq 'IGNORE';
		2257
1934	$SIG{PIPE} = sub { }	2258	$SIG{PIPE} = sub { }
1935	unless defined $SIG{PIPE};	2259	unless defined $SIG{PIPE};
		2260
		2261	=head1 RECOMMENDED/OPTIONAL MODULES
		2262
		2263	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and
		2264	it's built-in modules) are required to use it.
		2265
		2266	That does not mean that AnyEvent won't take advantage of some additional
		2267	modules if they are installed.
		2268
		2269	This section epxlains which additional modules will be used, and how they
		2270	affect AnyEvent's operetion.
		2271
		2272	=over 4
		2273
		2274	=item L<Async::Interrupt>
		2275
		2276	This slightly arcane module is used to implement fast signal handling: To
		2277	my knowledge, there is no way to do completely race-free and quick
		2278	signal handling in pure perl. To ensure that signals still get
		2279	delivered, AnyEvent will start an interval timer to wake up perl (and
		2280	catch the signals) with some delay (default is 10 seconds, look for
		2281	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
		2282
		2283	If this module is available, then it will be used to implement signal
		2284	catching, which means that signals will not be delayed, and the event loop
		2285	will not be interrupted regularly, which is more efficient (And good for
		2286	battery life on laptops).
		2287
		2288	This affects not just the pure-perl event loop, but also other event loops
		2289	that have no signal handling on their own (e.g. Glib, Tk, Qt).
		2290
		2291	Some event loops (POE, Event, Event::Lib) offer signal watchers natively,
		2292	and either employ their own workarounds (POE) or use AnyEvent's workaround
		2293	(using C<$AnyEvent::MAX_SIGNAL_LATENCY>). Installing L<Async::Interrupt>
		2294	does nothing for those backends.
		2295
		2296	=item L<EV>
		2297
		2298	This module isn't really "optional", as it is simply one of the backend
		2299	event loops that AnyEvent can use. However, it is simply the best event
		2300	loop available in terms of features, speed and stability: It supports
		2301	the AnyEvent API optimally, implements all the watcher types in XS, does
		2302	automatic timer adjustments even when no monotonic clock is available,
		2303	can take avdantage of advanced kernel interfaces such as C<epoll> and
		2304	C<kqueue>, and is the fastest backend I<by far>. You can even embed
		2305	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
		2306
		2307	=item L<Guard>
		2308
		2309	The guard module, when used, will be used to implement
		2310	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
		2311	lot less memory), but otherwise doesn't affect guard operation much. It is
		2312	purely used for performance.
		2313
		2314	=item L<JSON> and L<JSON::XS>
		2315
		2316	This module is required when you want to read or write JSON data via
		2317	L<AnyEvent::Handle>. It is also written in pure-perl, but can take
		2318	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
		2319
		2320	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
		2321	installed.
		2322
		2323	=item L<Net::SSLeay>
		2324
		2325	Implementing TLS/SSL in Perl is certainly interesting, but not very
		2326	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
		2327	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.
		2328
		2329	=item L<Time::HiRes>
		2330
		2331	This module is part of perl since release 5.008. It will be used when the
		2332	chosen event library does not come with a timing source on it's own. The
		2333	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to
		2334	try to use a monotonic clock for timing stability.
		2335
		2336	=back
1936		2337
1937		2338
1938	=head1 FORK	2339	=head1 FORK
1939		2340
1940	Most event libraries are not fork-safe. The ones who are usually are	2341	Most event libraries are not fork-safe. The ones who are usually are
1941	because they rely on inefficient but fork-safe C<select> or C<poll>	2342	because they rely on inefficient but fork-safe C<select> or C<poll>
1942	calls. Only L<EV> is fully fork-aware.	2343	calls. Only L<EV> is fully fork-aware.
1943		2344
1944	If you have to fork, you must either do so I<before> creating your first	2345	If you have to fork, you must either do so I<before> creating your first
1945	watcher OR you must not use AnyEvent at all in the child.	2346	watcher OR you must not use AnyEvent at all in the child OR you must do
		2347	something completely out of the scope of AnyEvent.
1946		2348
1947		2349
1948	=head1 SECURITY CONSIDERATIONS	2350	=head1 SECURITY CONSIDERATIONS
1949		2351
1950	AnyEvent can be forced to load any event model via	2352	AnyEvent can be forced to load any event model via
…		…
1962	use AnyEvent;	2364	use AnyEvent;
1963		2365
1964	Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can	2366	Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can
1965	be used to probe what backend is used and gain other information (which is	2367	be used to probe what backend is used and gain other information (which is
1966	probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and	2368	probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and
1967	$ENV{PERL_ANYEGENT_STRICT}.	2369	$ENV{PERL_ANYEVENT_STRICT}.
		2370
		2371	Note that AnyEvent will remove I<all> environment variables starting with
		2372	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is
		2373	enabled.
1968		2374
1969		2375
1970	=head1 BUGS	2376	=head1 BUGS
1971		2377
1972	Perl 5.8 has numerous memleaks that sometimes hit this module and are hard	2378	Perl 5.8 has numerous memleaks that sometimes hit this module and are hard
…		…
1984	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2390	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
1985		2391
1986	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2392	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
1987	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2393	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
1988	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2394	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
1989	L<AnyEvent::Impl::POE>.	2395	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.
1990		2396
1991	Non-blocking file handles, sockets, TCP clients and	2397	Non-blocking file handles, sockets, TCP clients and
1992	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>.	2398	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
1993		2399
1994	Asynchronous DNS: L<AnyEvent::DNS>.	2400	Asynchronous DNS: L<AnyEvent::DNS>.
1995		2401
1996	Coroutine support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>,	2402	Coroutine support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>,
		2403	L<Coro::Event>,
1997		2404
1998	Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>.	2405	Nontrivial usage examples: L<AnyEvent::GPSD>, L<AnyEvent::XMPP>,
		2406	L<AnyEvent::HTTP>.
1999		2407
2000		2408
2001	=head1 AUTHOR	2409	=head1 AUTHOR
2002		2410
2003	Marc Lehmann <schmorp@schmorp.de>	2411	Marc Lehmann <schmorp@schmorp.de>

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.208 by root, Sun Apr 26 18:12:53 2009 UTC vs. Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.208 by root, Sun Apr 26 18:12:53 2009 UTC vs.
Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC