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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.264 by root, Wed Jul 29 12:42:09 2009 UTC vs.
Revision 1.328 by root, Tue Jun 8 10:06:15 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 => ...
…		…
181	my variables are only visible after the statement in which they are	184	my variables are only visible after the statement in which they are
182	declared.	185	declared.
183		186
184	=head2 I/O WATCHERS	187	=head2 I/O WATCHERS
185		188
		189	$w = AnyEvent->io (
		190	fh => <filehandle_or_fileno>,
		191	poll => <"r" or "w">,
		192	cb => <callback>,
		193	);
		194
186	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	195	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
187	with the following mandatory key-value pairs as arguments:	196	with the following mandatory key-value pairs as arguments:
188		197
189	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch	198	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
190	for events (AnyEvent might or might not keep a reference to this file	199	for events (AnyEvent might or might not keep a reference to this file
…		…
219	undef $w;	228	undef $w;
220	});	229	});
221		230
222	=head2 TIME WATCHERS	231	=head2 TIME WATCHERS
223		232
		233	$w = AnyEvent->timer (after => <seconds>, cb => <callback>);
		234
		235	$w = AnyEvent->timer (
		236	after => <fractional_seconds>,
		237	interval => <fractional_seconds>,
		238	cb => <callback>,
		239	);
		240
224	You can create a time watcher by calling the C<< AnyEvent->timer >>	241	You can create a time watcher by calling the C<< AnyEvent->timer >>
225	method with the following mandatory arguments:	242	method with the following mandatory arguments:
226		243
227	C<after> specifies after how many seconds (fractional values are	244	C<after> specifies after how many seconds (fractional values are
228	supported) the callback should be invoked. C<cb> is the callback to invoke	245	supported) the callback should be invoked. C<cb> is the callback to invoke
…		…
349	might affect timers and time-outs.	366	might affect timers and time-outs.
350		367
351	When this is the case, you can call this method, which will update the	368	When this is the case, you can call this method, which will update the
352	event loop's idea of "current time".	369	event loop's idea of "current time".
353		370
		371	A typical example would be a script in a web server (e.g. C<mod_perl>) -
		372	when mod_perl executes the script, then the event loop will have the wrong
		373	idea about the "current time" (being potentially far in the past, when the
		374	script ran the last time). In that case you should arrange a call to C<<
		375	AnyEvent->now_update >> each time the web server process wakes up again
		376	(e.g. at the start of your script, or in a handler).
		377
354	Note that updating the time I<might> cause some events to be handled.	378	Note that updating the time I<might> cause some events to be handled.
355		379
356	=back	380	=back
357		381
358	=head2 SIGNAL WATCHERS	382	=head2 SIGNAL WATCHERS
		383
		384	$w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>);
359		385
360	You can watch for signals using a signal watcher, C<signal> is the signal	386	You can watch for signals using a signal watcher, C<signal> is the signal
361	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl	387	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl
362	callback to be invoked whenever a signal occurs.	388	callback to be invoked whenever a signal occurs.
363		389
…		…
380		406
381	Example: exit on SIGINT	407	Example: exit on SIGINT
382		408
383	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	409	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
384		410
		411	=head3 Restart Behaviour
		412
		413	While restart behaviour is up to the event loop implementation, most will
		414	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		415	pure perl implementation).
		416
		417	=head3 Safe/Unsafe Signals
		418
		419	Perl signals can be either "safe" (synchronous to opcode handling) or
		420	"unsafe" (asynchronous) - the former might get delayed indefinitely, the
		421	latter might corrupt your memory.
		422
		423	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		424	i.e. they will not interrupt your running perl program but will only be
		425	called as part of the normal event handling (just like timer, I/O etc.
		426	callbacks, too).
		427
385	=head3 Signal Races, Delays and Workarounds	428	=head3 Signal Races, Delays and Workarounds
386		429
387	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	430	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
388	callbacks to signals in a generic way, which is a pity, as you cannot do	431	callbacks to signals in a generic way, which is a pity, as you cannot
389	race-free signal handling in perl. AnyEvent will try to do it's best, but	432	do race-free signal handling in perl, requiring C libraries for
		433	this. AnyEvent will try to do it's best, which means in some cases,
390	in some cases, signals will be delayed. The maximum time a signal might	434	signals will be delayed. The maximum time a signal might be delayed is
391	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10	435	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This
392	seconds). This variable can be changed only before the first signal	436	variable can be changed only before the first signal watcher is created,
393	watcher is created, and should be left alone otherwise. Higher values	437	and should be left alone otherwise. This variable determines how often
		438	AnyEvent polls for signals (in case a wake-up was missed). Higher values
394	will cause fewer spurious wake-ups, which is better for power and CPU	439	will cause fewer spurious wake-ups, which is better for power and CPU
		440	saving.
		441
395	saving. All these problems can be avoided by installing the optional	442	All these problems can be avoided by installing the optional
396	L<Async::Interrupt> module. This will not work with inherently broken	443	L<Async::Interrupt> module, which works with most event loops. It will not
397	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>	444	work with inherently broken event loops such as L<Event> or L<Event::Lib>
398	currently, as POE does it's own workaround with one-second latency). With	445	(and not with L<POE> currently, as POE does it's own workaround with
399	those, you just have to suffer the delays.	446	one-second latency). For those, you just have to suffer the delays.
400		447
401	=head2 CHILD PROCESS WATCHERS	448	=head2 CHILD PROCESS WATCHERS
		449
		450	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
402		451
403	You can also watch on a child process exit and catch its exit status.	452	You can also watch on a child process exit and catch its exit status.
404		453
405	The child process is specified by the C<pid> argument (one some backends,	454	The child process is specified by the C<pid> argument (one some backends,
406	using C<0> watches for any child process exit, on others this will	455	using C<0> watches for any child process exit, on others this will
…		…
455	# do something else, then wait for process exit	504	# do something else, then wait for process exit
456	$done->recv;	505	$done->recv;
457		506
458	=head2 IDLE WATCHERS	507	=head2 IDLE WATCHERS
459		508
460	Sometimes there is a need to do something, but it is not so important	509	$w = AnyEvent->idle (cb => <callback>);
461	to do it instantly, but only when there is nothing better to do. This
462	"nothing better to do" is usually defined to be "no other events need
463	attention by the event loop".
464		510
465	Idle watchers ideally get invoked when the event loop has nothing	511	Repeatedly invoke the callback after the process becomes idle, until
466	better to do, just before it would block the process to wait for new	512	either the watcher is destroyed or new events have been detected.
467	events. Instead of blocking, the idle watcher is invoked.
468		513
469	Most event loops unfortunately do not really support idle watchers (only	514	Idle watchers are useful when there is a need to do something, but it
		515	is not so important (or wise) to do it instantly. The callback will be
		516	invoked only when there is "nothing better to do", which is usually
		517	defined as "all outstanding events have been handled and no new events
		518	have been detected". That means that idle watchers ideally get invoked
		519	when the event loop has just polled for new events but none have been
		520	detected. Instead of blocking to wait for more events, the idle watchers
		521	will be invoked.
		522
		523	Unfortunately, most event loops do not really support idle watchers (only
470	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	524	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
471	will simply call the callback "from time to time".	525	will simply call the callback "from time to time".
472		526
473	Example: read lines from STDIN, but only process them when the	527	Example: read lines from STDIN, but only process them when the
474	program is otherwise idle:	528	program is otherwise idle:
…		…
490	});	544	});
491	});	545	});
492		546
493	=head2 CONDITION VARIABLES	547	=head2 CONDITION VARIABLES
494		548
		549	$cv = AnyEvent->condvar;
		550
		551	$cv->send (<list>);
		552	my @res = $cv->recv;
		553
495	If you are familiar with some event loops you will know that all of them	554	If you are familiar with some event loops you will know that all of them
496	require you to run some blocking "loop", "run" or similar function that	555	require you to run some blocking "loop", "run" or similar function that
497	will actively watch for new events and call your callbacks.	556	will actively watch for new events and call your callbacks.
498		557
499	AnyEvent is slightly different: it expects somebody else to run the event	558	AnyEvent is slightly different: it expects somebody else to run the event
500	loop and will only block when necessary (usually when told by the user).	559	loop and will only block when necessary (usually when told by the user).
501		560
502	The instrument to do that is called a "condition variable", so called	561	The tool to do that is called a "condition variable", so called because
503	because they represent a condition that must become true.	562	they represent a condition that must become true.
504		563
505	Now is probably a good time to look at the examples further below.	564	Now is probably a good time to look at the examples further below.
506		565
507	Condition variables can be created by calling the C<< AnyEvent->condvar	566	Condition variables can be created by calling the C<< AnyEvent->condvar
508	>> method, usually without arguments. The only argument pair allowed is	567	>> method, usually without arguments. The only argument pair allowed is
…		…
513	After creation, the condition variable is "false" until it becomes "true"	572	After creation, the condition variable is "false" until it becomes "true"
514	by calling the C<send> method (or calling the condition variable as if it	573	by calling the C<send> method (or calling the condition variable as if it
515	were a callback, read about the caveats in the description for the C<<	574	were a callback, read about the caveats in the description for the C<<
516	->send >> method).	575	->send >> method).
517		576
518	Condition variables are similar to callbacks, except that you can	577	Since condition variables are the most complex part of the AnyEvent API, here are
519	optionally wait for them. They can also be called merge points - points	578	some different mental models of what they are - pick the ones you can connect to:
520	in time where multiple outstanding events have been processed. And yet	579
521	another way to call them is transactions - each condition variable can be	580	=over 4
522	used to represent a transaction, which finishes at some point and delivers	581
523	a result. And yet some people know them as "futures" - a promise to	582	=item * Condition variables are like callbacks - you can call them (and pass them instead
524	compute/deliver something that you can wait for.	583	of callbacks). Unlike callbacks however, you can also wait for them to be called.
		584
		585	=item * Condition variables are signals - one side can emit or send them,
		586	the other side can wait for them, or install a handler that is called when
		587	the signal fires.
		588
		589	=item * Condition variables are like "Merge Points" - points in your program
		590	where you merge multiple independent results/control flows into one.
		591
		592	=item * Condition variables represent a transaction - function that start
		593	some kind of transaction can return them, leaving the caller the choice
		594	between waiting in a blocking fashion, or setting a callback.
		595
		596	=item * Condition variables represent future values, or promises to deliver
		597	some result, long before the result is available.
		598
		599	=back
525		600
526	Condition variables are very useful to signal that something has finished,	601	Condition variables are very useful to signal that something has finished,
527	for example, if you write a module that does asynchronous http requests,	602	for example, if you write a module that does asynchronous http requests,
528	then a condition variable would be the ideal candidate to signal the	603	then a condition variable would be the ideal candidate to signal the
529	availability of results. The user can either act when the callback is	604	availability of results. The user can either act when the callback is
…		…
550	eventually calls C<< -> send >>, and the "consumer side", which waits	625	eventually calls C<< -> send >>, and the "consumer side", which waits
551	for the send to occur.	626	for the send to occur.
552		627
553	Example: wait for a timer.	628	Example: wait for a timer.
554		629
555	# wait till the result is ready	630	# condition: "wait till the timer is fired"
556	my $result_ready = AnyEvent->condvar;	631	my $timer_fired = AnyEvent->condvar;
557		632
558	# do something such as adding a timer	633	# create the timer - we could wait for, say
559	# or socket watcher the calls $result_ready->send	634	# a handle becomign ready, or even an
560	# when the "result" is ready.	635	# AnyEvent::HTTP request to finish, but
561	# in this case, we simply use a timer:	636	# in this case, we simply use a timer:
562	my $w = AnyEvent->timer (	637	my $w = AnyEvent->timer (
563	after => 1,	638	after => 1,
564	cb => sub { $result_ready->send },	639	cb => sub { $timer_fired->send },
565	);	640	);
566		641
567	# this "blocks" (while handling events) till the callback	642	# this "blocks" (while handling events) till the callback
568	# calls -<send	643	# calls ->send
569	$result_ready->recv;	644	$timer_fired->recv;
570		645
571	Example: wait for a timer, but take advantage of the fact that condition	646	Example: wait for a timer, but take advantage of the fact that condition
572	variables are also callable directly.	647	variables are also callable directly.
573		648
574	my $done = AnyEvent->condvar;	649	my $done = AnyEvent->condvar;
…		…
637	one. For example, a function that pings many hosts in parallel might want	712	one. For example, a function that pings many hosts in parallel might want
638	to use a condition variable for the whole process.	713	to use a condition variable for the whole process.
639		714
640	Every call to C<< ->begin >> will increment a counter, and every call to	715	Every call to C<< ->begin >> will increment a counter, and every call to
641	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	716	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
642	>>, the (last) callback passed to C<begin> will be executed. That callback	717	>>, the (last) callback passed to C<begin> will be executed, passing the
643	is I<supposed> to call C<< ->send >>, but that is not required. If no	718	condvar as first argument. That callback is I<supposed> to call C<< ->send
644	callback was set, C<send> will be called without any arguments.	719	>>, but that is not required. If no group callback was set, C<send> will
		720	be called without any arguments.
645		721
646	You can think of C<< $cv->send >> giving you an OR condition (one call	722	You can think of C<< $cv->send >> giving you an OR condition (one call
647	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	723	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
648	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	724	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
649		725
…		…
676	begung can potentially be zero:	752	begung can potentially be zero:
677		753
678	my $cv = AnyEvent->condvar;	754	my $cv = AnyEvent->condvar;
679		755
680	my %result;	756	my %result;
681	$cv->begin (sub { $cv->send (\%result) });	757	$cv->begin (sub { shift->send (\%result) });
682		758
683	for my $host (@list_of_hosts) {	759	for my $host (@list_of_hosts) {
684	$cv->begin;	760	$cv->begin;
685	ping_host_then_call_callback $host, sub {	761	ping_host_then_call_callback $host, sub {
686	$result{$host} = ...;	762	$result{$host} = ...;
…		…
761	=item $cb = $cv->cb ($cb->($cv))	837	=item $cb = $cv->cb ($cb->($cv))
762		838
763	This is a mutator function that returns the callback set and optionally	839	This is a mutator function that returns the callback set and optionally
764	replaces it before doing so.	840	replaces it before doing so.
765		841
766	The callback will be called when the condition becomes "true", i.e. when	842	The callback will be called when the condition becomes (or already was)
767	C<send> or C<croak> are called, with the only argument being the condition	843	"true", i.e. when C<send> or C<croak> are called (or were called), with
768	variable itself. Calling C<recv> inside the callback or at any later time	844	the only argument being the condition variable itself. Calling C<recv>
769	is guaranteed not to block.	845	inside the callback or at any later time is guaranteed not to block.
770		846
771	=back	847	=back
772		848
773	=head1 SUPPORTED EVENT LOOPS/BACKENDS	849	=head1 SUPPORTED EVENT LOOPS/BACKENDS
774		850
…		…
777	=over 4	853	=over 4
778		854
779	=item Backends that are autoprobed when no other event loop can be found.	855	=item Backends that are autoprobed when no other event loop can be found.
780		856
781	EV is the preferred backend when no other event loop seems to be in	857	EV is the preferred backend when no other event loop seems to be in
782	use. If EV is not installed, then AnyEvent will try Event, and, failing	858	use. If EV is not installed, then AnyEvent will fall back to its own
783	that, will fall back to its own pure-perl implementation, which is	859	pure-perl implementation, which is available everywhere as it comes with
784	available everywhere as it comes with AnyEvent itself.	860	AnyEvent itself.
785		861
786	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	862	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
787	AnyEvent::Impl::Event based on Event, very stable, few glitches.
788	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	863	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
789		864
790	=item Backends that are transparently being picked up when they are used.	865	=item Backends that are transparently being picked up when they are used.
791		866
792	These will be used when they are currently loaded when the first watcher	867	These will be used when they are currently loaded when the first watcher
793	is created, in which case it is assumed that the application is using	868	is created, in which case it is assumed that the application is using
794	them. This means that AnyEvent will automatically pick the right backend	869	them. This means that AnyEvent will automatically pick the right backend
795	when the main program loads an event module before anything starts to	870	when the main program loads an event module before anything starts to
796	create watchers. Nothing special needs to be done by the main program.	871	create watchers. Nothing special needs to be done by the main program.
797		872
		873	AnyEvent::Impl::Event based on Event, very stable, few glitches.
798	AnyEvent::Impl::Glib based on Glib, slow but very stable.	874	AnyEvent::Impl::Glib based on Glib, slow but very stable.
799	AnyEvent::Impl::Tk based on Tk, very broken.	875	AnyEvent::Impl::Tk based on Tk, very broken.
800	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	876	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
801	AnyEvent::Impl::POE based on POE, very slow, some limitations.	877	AnyEvent::Impl::POE based on POE, very slow, some limitations.
802	AnyEvent::Impl::Irssi used when running within irssi.	878	AnyEvent::Impl::Irssi used when running within irssi.
…		…
912	You should check C<$AnyEvent::MODEL> before adding to this array, though:	988	You should check C<$AnyEvent::MODEL> before adding to this array, though:
913	if it is defined then the event loop has already been detected, and the	989	if it is defined then the event loop has already been detected, and the
914	array will be ignored.	990	array will be ignored.
915		991
916	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	992	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
917	it,as it takes care of these details.	993	it, as it takes care of these details.
918		994
919	This variable is mainly useful for modules that can do something useful	995	This variable is mainly useful for modules that can do something useful
920	when AnyEvent is used and thus want to know when it is initialised, but do	996	when AnyEvent is used and thus want to know when it is initialised, but do
921	not need to even load it by default. This array provides the means to hook	997	not need to even load it by default. This array provides the means to hook
922	into AnyEvent passively, without loading it.	998	into AnyEvent passively, without loading it.
		999
		1000	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		1001	together, you could put this into Coro (this is the actual code used by
		1002	Coro to accomplish this):
		1003
		1004	if (defined $AnyEvent::MODEL) {
		1005	# AnyEvent already initialised, so load Coro::AnyEvent
		1006	require Coro::AnyEvent;
		1007	} else {
		1008	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		1009	# as soon as it is
		1010	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		1011	}
923		1012
924	=back	1013	=back
925		1014
926	=head1 WHAT TO DO IN A MODULE	1015	=head1 WHAT TO DO IN A MODULE
927		1016
…		…
984	=head1 OTHER MODULES	1073	=head1 OTHER MODULES
985		1074
986	The following is a non-exhaustive list of additional modules that use	1075	The following is a non-exhaustive list of additional modules that use
987	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1076	AnyEvent as a client and can therefore be mixed easily with other AnyEvent
988	modules and other event loops in the same program. Some of the modules	1077	modules and other event loops in the same program. Some of the modules
989	come with AnyEvent, most are available via CPAN.	1078	come as part of AnyEvent, the others are available via CPAN.
990		1079
991	=over 4	1080	=over 4
992		1081
993	=item L<AnyEvent::Util>	1082	=item L<AnyEvent::Util>
994		1083
…		…
1009		1098
1010	=item L<AnyEvent::DNS>	1099	=item L<AnyEvent::DNS>
1011		1100
1012	Provides rich asynchronous DNS resolver capabilities.	1101	Provides rich asynchronous DNS resolver capabilities.
1013		1102
		1103	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
		1104
		1105	Implement event-based interfaces to the protocols of the same name (for
		1106	the curious, IGS is the International Go Server and FCP is the Freenet
		1107	Client Protocol).
		1108
		1109	=item L<AnyEvent::Handle::UDP>
		1110
		1111	Here be danger!
		1112
		1113	As Pauli would put it, "Not only is it not right, it's not even wrong!" -
		1114	there are so many things wrong with AnyEvent::Handle::UDP, most notably
		1115	it's use of a stream-based API with a protocol that isn't streamable, that
		1116	the only way to improve it is to delete it.
		1117
		1118	It features data corruption (but typically only under load) and general
		1119	confusion. On top, the author is not only clueless about UDP but also
		1120	fact-resistant - some gems of his understanding: "connect doesn't work
		1121	with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
		1122	packets", "I don't need to implement proper error checking as UDP doesn't
		1123	support error checking" and so on - he doesn't even understand what's
		1124	wrong with his module when it is explained to him.
		1125
1014	=item L<AnyEvent::HTTP>	1126	=item L<AnyEvent::DBI>
1015		1127
1016	A simple-to-use HTTP library that is capable of making a lot of concurrent	1128	Executes L<DBI> requests asynchronously in a proxy process for you,
1017	HTTP requests.	1129	notifying you in an event-bnased way when the operation is finished.
		1130
		1131	=item L<AnyEvent::AIO>
		1132
		1133	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
		1134	toolbox of every event programmer. AnyEvent::AIO transparently fuses
		1135	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
		1136	file I/O, and much more.
1018		1137
1019	=item L<AnyEvent::HTTPD>	1138	=item L<AnyEvent::HTTPD>
1020		1139
1021	Provides a simple web application server framework.	1140	A simple embedded webserver.
1022		1141
1023	=item L<AnyEvent::FastPing>	1142	=item L<AnyEvent::FastPing>
1024		1143
1025	The fastest ping in the west.	1144	The fastest ping in the west.
1026
1027	=item L<AnyEvent::DBI>
1028
1029	Executes L<DBI> requests asynchronously in a proxy process.
1030
1031	=item L<AnyEvent::AIO>
1032
1033	Truly asynchronous I/O, should be in the toolbox of every event
1034	programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent
1035	together.
1036
1037	=item L<AnyEvent::BDB>
1038
1039	Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses
1040	L<BDB> and AnyEvent together.
1041
1042	=item L<AnyEvent::GPSD>
1043
1044	A non-blocking interface to gpsd, a daemon delivering GPS information.
1045
1046	=item L<AnyEvent::IRC>
1047
1048	AnyEvent based IRC client module family (replacing the older Net::IRC3).
1049
1050	=item L<AnyEvent::XMPP>
1051
1052	AnyEvent based XMPP (Jabber protocol) module family (replacing the older
1053	Net::XMPP2>.
1054
1055	=item L<AnyEvent::IGS>
1056
1057	A non-blocking interface to the Internet Go Server protocol (used by
1058	L<App::IGS>).
1059
1060	=item L<Net::FCP>
1061
1062	AnyEvent-based implementation of the Freenet Client Protocol, birthplace
1063	of AnyEvent.
1064
1065	=item L<Event::ExecFlow>
1066
1067	High level API for event-based execution flow control.
1068		1145
1069	=item L<Coro>	1146	=item L<Coro>
1070		1147
1071	Has special support for AnyEvent via L<Coro::AnyEvent>.	1148	Has special support for AnyEvent via L<Coro::AnyEvent>.
1072		1149
…		…
1076		1153
1077	package AnyEvent;	1154	package AnyEvent;
1078		1155
1079	# basically a tuned-down version of common::sense	1156	# basically a tuned-down version of common::sense
1080	sub common_sense {	1157	sub common_sense {
1081	# no warnings	1158	# from common:.sense 1.0
1082	${^WARNING_BITS} ^= ${^WARNING_BITS};	1159	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1083	# use strict vars subs	1160	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1084	$^H \|= 0x00000600;	1161	$^H \|= 0x00000600;
1085	}	1162	}
1086		1163
1087	BEGIN { AnyEvent::common_sense }	1164	BEGIN { AnyEvent::common_sense }
1088		1165
1089	use Carp ();	1166	use Carp ();
1090		1167
1091	our $VERSION = 4.881;	1168	our $VERSION = '5.271';
1092	our $MODEL;	1169	our $MODEL;
1093		1170
1094	our $AUTOLOAD;	1171	our $AUTOLOAD;
1095	our @ISA;	1172	our @ISA;
1096		1173
1097	our @REGISTRY;	1174	our @REGISTRY;
1098		1175
1099	our $WIN32;
1100
1101	our $VERBOSE;	1176	our $VERBOSE;
1102		1177
1103	BEGIN {	1178	BEGIN {
1104	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1179	require "AnyEvent/constants.pl";
		1180
1105	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1181	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1106		1182
1107	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1183	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1108	if ${^TAINT};	1184	if ${^TAINT};
1109		1185
1110	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1186	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1122	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1198	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1123	}	1199	}
1124		1200
1125	my @models = (	1201	my @models = (
1126	[EV:: => AnyEvent::Impl::EV:: , 1],	1202	[EV:: => AnyEvent::Impl::EV:: , 1],
1127	[Event:: => AnyEvent::Impl::Event::, 1],
1128	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1203	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1129	# everything below here will not (normally) be autoprobed	1204	# everything below here will not (normally) be autoprobed
1130	# as the pureperl backend should work everywhere	1205	# as the pureperl backend should work everywhere
1131	# and is usually faster	1206	# and is usually faster
		1207	[Event:: => AnyEvent::Impl::Event::, 1],
1132	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1208	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1133	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1209	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1134	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1210	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1135	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1211	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1136	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1212	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
…		…
1139	[Prima:: => AnyEvent::Impl::POE::],	1215	[Prima:: => AnyEvent::Impl::POE::],
1140	# IO::Async is just too broken - we would need workarounds for its	1216	# IO::Async is just too broken - we would need workarounds for its
1141	# byzantine signal and broken child handling, among others.	1217	# byzantine signal and broken child handling, among others.
1142	# IO::Async is rather hard to detect, as it doesn't have any	1218	# IO::Async is rather hard to detect, as it doesn't have any
1143	# obvious default class.	1219	# obvious default class.
1144	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1220	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1145	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1221	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1146	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1222	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1223	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1147	);	1224	);
1148		1225
1149	our %method = map +($_ => 1),	1226	our %method = map +($_ => 1),
1150	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1227	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1151		1228
1152	our @post_detect;	1229	our @post_detect;
1153		1230
1154	sub post_detect(&) {	1231	sub post_detect(&) {
1155	my ($cb) = @_;	1232	my ($cb) = @_;
1156		1233
1157	if ($MODEL) {
1158	$cb->();
1159
1160	undef
1161	} else {
1162	push @post_detect, $cb;	1234	push @post_detect, $cb;
1163		1235
1164	defined wantarray	1236	defined wantarray
1165	? bless \$cb, "AnyEvent::Util::postdetect"	1237	? bless \$cb, "AnyEvent::Util::postdetect"
1166	: ()	1238	: ()
1167	}
1168	}	1239	}
1169		1240
1170	sub AnyEvent::Util::postdetect::DESTROY {	1241	sub AnyEvent::Util::postdetect::DESTROY {
1171	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1242	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1172	}	1243	}
1173		1244
1174	sub detect() {	1245	sub detect() {
		1246	# free some memory
		1247	*detect = sub () { $MODEL };
		1248
		1249	local $!; # for good measure
		1250	local $SIG{__DIE__};
		1251
		1252	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1253	my $model = "AnyEvent::Impl::$1";
		1254	if (eval "require $model") {
		1255	$MODEL = $model;
		1256	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1257	} else {
		1258	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1259	}
		1260	}
		1261
		1262	# check for already loaded models
1175	unless ($MODEL) {	1263	unless ($MODEL) {
1176	local $SIG{__DIE__};	1264	for (@REGISTRY, @models) {
1177		1265	my ($package, $model) = @$_;
1178	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1266	if (${"$package\::VERSION"} > 0) {
1179	my $model = "AnyEvent::Impl::$1";
1180	if (eval "require $model") {	1267	if (eval "require $model") {
1181	$MODEL = $model;	1268	$MODEL = $model;
1182	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1269	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1183	} else {	1270	last;
1184	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1271	}
1185	}	1272	}
1186	}	1273	}
1187		1274
1188	# check for already loaded models
1189	unless ($MODEL) {	1275	unless ($MODEL) {
		1276	# try to autoload a model
1190	for (@REGISTRY, @models) {	1277	for (@REGISTRY, @models) {
1191	my ($package, $model) = @$_;	1278	my ($package, $model, $autoload) = @$_;
		1279	if (
		1280	$autoload
		1281	and eval "require $package"
1192	if (${"$package\::VERSION"} > 0) {	1282	and ${"$package\::VERSION"} > 0
1193	if (eval "require $model") {	1283	and eval "require $model"
		1284	) {
1194	$MODEL = $model;	1285	$MODEL = $model;
1195	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1286	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1196	last;	1287	last;
1197	}
1198	}	1288	}
1199	}	1289	}
1200		1290
1201	unless ($MODEL) {
1202	# try to autoload a model
1203	for (@REGISTRY, @models) {
1204	my ($package, $model, $autoload) = @$_;
1205	if (
1206	$autoload
1207	and eval "require $package"
1208	and ${"$package\::VERSION"} > 0
1209	and eval "require $model"
1210	) {
1211	$MODEL = $model;
1212	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1213	last;
1214	}
1215	}
1216
1217	$MODEL	1291	$MODEL
1218	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1292	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1219	}
1220	}	1293	}
1221
1222	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1223
1224	unshift @ISA, $MODEL;
1225
1226	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1227
1228	(shift @post_detect)->() while @post_detect;
1229	}	1294	}
		1295
		1296	@models = (); # free probe data
		1297
		1298	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1299	unshift @ISA, $MODEL;
		1300
		1301	# now nuke some methods that are overriden by the backend.
		1302	# SUPER is not allowed.
		1303	for (qw(time signal child idle)) {
		1304	undef &{"AnyEvent::Base::$_"}
		1305	if defined &{"$MODEL\::$_"};
		1306	}
		1307
		1308	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1309
		1310	(shift @post_detect)->() while @post_detect;
		1311
		1312	*post_detect = sub(&) {
		1313	shift->();
		1314
		1315	undef
		1316	};
1230		1317
1231	$MODEL	1318	$MODEL
1232	}	1319	}
1233		1320
1234	sub AUTOLOAD {	1321	sub AUTOLOAD {
1235	(my $func = $AUTOLOAD) =~ s/.*://;	1322	(my $func = $AUTOLOAD) =~ s/.*://;
1236		1323
1237	$method{$func}	1324	$method{$func}
1238	or Carp::croak "$func: not a valid method for AnyEvent objects";	1325	or Carp::croak "$func: not a valid AnyEvent class method";
1239		1326
1240	detect unless $MODEL;	1327	detect;
1241		1328
1242	my $class = shift;	1329	my $class = shift;
1243	$class->$func (@_);	1330	$class->$func (@_);
1244	}	1331	}
1245		1332
…		…
1258	# we assume CLOEXEC is already set by perl in all important cases	1345	# we assume CLOEXEC is already set by perl in all important cases
1259		1346
1260	($fh2, $rw)	1347	($fh2, $rw)
1261	}	1348	}
1262		1349
		1350	=head1 SIMPLIFIED AE API
		1351
		1352	Starting with version 5.0, AnyEvent officially supports a second, much
		1353	simpler, API that is designed to reduce the calling, typing and memory
		1354	overhead by using function call syntax and a fixed number of parameters.
		1355
		1356	See the L<AE> manpage for details.
		1357
		1358	=cut
		1359
		1360	package AE;
		1361
		1362	our $VERSION = $AnyEvent::VERSION;
		1363
		1364	# fall back to the main API by default - backends and AnyEvent::Base
		1365	# implementations can overwrite these.
		1366
		1367	sub io($$$) {
		1368	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1369	}
		1370
		1371	sub timer($$$) {
		1372	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1373	}
		1374
		1375	sub signal($$) {
		1376	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1377	}
		1378
		1379	sub child($$) {
		1380	AnyEvent->child (pid => $_[0], cb => $_[1])
		1381	}
		1382
		1383	sub idle($) {
		1384	AnyEvent->idle (cb => $_[0])
		1385	}
		1386
		1387	sub cv(;&) {
		1388	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1389	}
		1390
		1391	sub now() {
		1392	AnyEvent->now
		1393	}
		1394
		1395	sub now_update() {
		1396	AnyEvent->now_update
		1397	}
		1398
		1399	sub time() {
		1400	AnyEvent->time
		1401	}
		1402
1263	package AnyEvent::Base;	1403	package AnyEvent::Base;
1264		1404
1265	# default implementations for many methods	1405	# default implementations for many methods
1266		1406
1267	sub _time {	1407	sub time {
		1408	eval q{ # poor man's autoloading {}
1268	# probe for availability of Time::HiRes	1409	# probe for availability of Time::HiRes
1269	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1410	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1270	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1411	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1271	*_time = \&Time::HiRes::time;	1412	*AE::time = \&Time::HiRes::time;
1272	# if (eval "use POSIX (); (POSIX::times())...	1413	# if (eval "use POSIX (); (POSIX::times())...
1273	} else {	1414	} else {
1274	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1415	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1275	*_time = sub { time }; # epic fail	1416	*AE::time = sub (){ time }; # epic fail
		1417	}
		1418
		1419	*time = sub { AE::time }; # different prototypes
1276	}	1420	};
		1421	die if $@;
1277		1422
1278	&_time	1423	&time
1279	}	1424	}
1280		1425
1281	sub time { _time }	1426	*now = \&time;
1282	sub now { _time }	1427
1283	sub now_update { }	1428	sub now_update { }
1284		1429
1285	# default implementation for ->condvar	1430	# default implementation for ->condvar
1286		1431
1287	sub condvar {	1432	sub condvar {
		1433	eval q{ # poor man's autoloading {}
		1434	*condvar = sub {
1288	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1435	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
		1436	};
		1437
		1438	*AE::cv = sub (;&) {
		1439	bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar"
		1440	};
		1441	};
		1442	die if $@;
		1443
		1444	&condvar
1289	}	1445	}
1290		1446
1291	# default implementation for ->signal	1447	# default implementation for ->signal
1292		1448
1293	our $HAVE_ASYNC_INTERRUPT;	1449	our $HAVE_ASYNC_INTERRUPT;
1294		1450
1295	sub _have_async_interrupt() {	1451	sub _have_async_interrupt() {
1296	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1452	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1297	&& eval "use Async::Interrupt 1.0 (); 1")	1453	&& eval "use Async::Interrupt 1.02 (); 1")
1298	unless defined $HAVE_ASYNC_INTERRUPT;	1454	unless defined $HAVE_ASYNC_INTERRUPT;
1299		1455
1300	$HAVE_ASYNC_INTERRUPT	1456	$HAVE_ASYNC_INTERRUPT
1301	}	1457	}
1302		1458
1303	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1459	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1304	our (%SIG_ASY, %SIG_ASY_W);	1460	our (%SIG_ASY, %SIG_ASY_W);
1305	our ($SIG_COUNT, $SIG_TW);	1461	our ($SIG_COUNT, $SIG_TW);
1306		1462
1307	sub _signal_exec {
1308	$HAVE_ASYNC_INTERRUPT
1309	? $SIGPIPE_R->drain
1310	: sysread $SIGPIPE_R, my $dummy, 9;
1311
1312	while (%SIG_EV) {
1313	for (keys %SIG_EV) {
1314	delete $SIG_EV{$_};
1315	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1316	}
1317	}
1318	}
1319
1320	# install a dummy wakeup watcher to reduce signal catching latency	1463	# install a dummy wakeup watcher to reduce signal catching latency
		1464	# used by Impls
1321	sub _sig_add() {	1465	sub _sig_add() {
1322	unless ($SIG_COUNT++) {	1466	unless ($SIG_COUNT++) {
1323	# try to align timer on a full-second boundary, if possible	1467	# try to align timer on a full-second boundary, if possible
1324	my $NOW = AnyEvent->now;	1468	my $NOW = AE::now;
1325		1469
1326	$SIG_TW = AnyEvent->timer (	1470	$SIG_TW = AE::timer
1327	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1471	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1328	interval => $MAX_SIGNAL_LATENCY,	1472	$MAX_SIGNAL_LATENCY,
1329	cb => sub { }, # just for the PERL_ASYNC_CHECK	1473	sub { } # just for the PERL_ASYNC_CHECK
1330	);	1474	;
1331	}	1475	}
1332	}	1476	}
1333		1477
1334	sub _sig_del {	1478	sub _sig_del {
1335	undef $SIG_TW	1479	undef $SIG_TW
1336	unless --$SIG_COUNT;	1480	unless --$SIG_COUNT;
1337	}	1481	}
1338		1482
1339	our $_sig_name_init; $_sig_name_init = sub {	1483	our $_sig_name_init; $_sig_name_init = sub {
		1484	eval q{ # poor man's autoloading {}
1340	undef $_sig_name_init;	1485	undef $_sig_name_init;
1341		1486
1342	if (_have_async_interrupt) {	1487	if (_have_async_interrupt) {
1343	*sig2num = \&Async::Interrupt::sig2num;	1488	*sig2num = \&Async::Interrupt::sig2num;
1344	*sig2name = \&Async::Interrupt::sig2name;	1489	*sig2name = \&Async::Interrupt::sig2name;
1345	} else {	1490	} else {
1346	require Config;	1491	require Config;
1347		1492
1348	my %signame2num;	1493	my %signame2num;
1349	@signame2num{ split ' ', $Config::Config{sig_name} }	1494	@signame2num{ split ' ', $Config::Config{sig_name} }
1350	= split ' ', $Config::Config{sig_num};	1495	= split ' ', $Config::Config{sig_num};
1351		1496
1352	my @signum2name;	1497	my @signum2name;
1353	@signum2name[values %signame2num] = keys %signame2num;	1498	@signum2name[values %signame2num] = keys %signame2num;
1354		1499
1355	*sig2num = sub($) {	1500	*sig2num = sub($) {
1356	$_[0] > 0 ? shift : $signame2num{+shift}	1501	$_[0] > 0 ? shift : $signame2num{+shift}
1357	};	1502	};
1358	*sig2name = sub ($) {	1503	*sig2name = sub ($) {
1359	$_[0] > 0 ? $signum2name[+shift] : shift	1504	$_[0] > 0 ? $signum2name[+shift] : shift
		1505	};
1360	};	1506	}
1361	}	1507	};
		1508	die if $@;
1362	};	1509	};
1363		1510
1364	sub sig2num ($) { &$_sig_name_init; &sig2num }	1511	sub sig2num ($) { &$_sig_name_init; &sig2num }
1365	sub sig2name($) { &$_sig_name_init; &sig2name }	1512	sub sig2name($) { &$_sig_name_init; &sig2name }
1366		1513
1367	sub _signal {	1514	sub signal {
		1515	eval q{ # poor man's autoloading {}
		1516	# probe for availability of Async::Interrupt
		1517	if (_have_async_interrupt) {
		1518	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
		1519
		1520	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1521	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
		1522
		1523	} else {
		1524	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1525
		1526	if (AnyEvent::WIN32) {
		1527	require AnyEvent::Util;
		1528
		1529	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1530	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1531	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1532	} else {
		1533	pipe $SIGPIPE_R, $SIGPIPE_W;
		1534	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
		1535	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
		1536
		1537	# not strictly required, as $^F is normally 2, but let's make sure...
		1538	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1539	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1540	}
		1541
		1542	$SIGPIPE_R
		1543	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1544
		1545	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1546	}
		1547
		1548	*signal = $HAVE_ASYNC_INTERRUPT
		1549	? sub {
1368	my (undef, %arg) = @_;	1550	my (undef, %arg) = @_;
1369		1551
1370	my $signal = uc $arg{signal}
1371	or Carp::croak "required option 'signal' is missing";
1372
1373	if ($HAVE_ASYNC_INTERRUPT) {
1374	# async::interrupt	1552	# async::interrupt
1375
1376	$signal = sig2num $signal;	1553	my $signal = sig2num $arg{signal};
1377	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1554	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1378		1555
1379	$SIG_ASY{$signal} \|\|= new Async::Interrupt	1556	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1380	cb => sub { undef $SIG_EV{$signal} },	1557	cb => sub { undef $SIG_EV{$signal} },
1381	signal => $signal,	1558	signal => $signal,
1382	pipe => [$SIGPIPE_R->filenos],	1559	pipe => [$SIGPIPE_R->filenos],
1383	pipe_autodrain => 0,	1560	pipe_autodrain => 0,
		1561	;
		1562
		1563	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1564	}
		1565	: sub {
		1566	my (undef, %arg) = @_;
		1567
		1568	# pure perl
		1569	my $signal = sig2name $arg{signal};
		1570	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1571
		1572	$SIG{$signal} \|\|= sub {
		1573	local $!;
		1574	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1575	undef $SIG_EV{$signal};
		1576	};
		1577
		1578	# can't do signal processing without introducing races in pure perl,
		1579	# so limit the signal latency.
		1580	_sig_add;
		1581
		1582	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1583	}
1384	;	1584	;
1385		1585
1386	} else {	1586	*AnyEvent::Base::signal::DESTROY = sub {
1387	# pure perl	1587	my ($signal, $cb) = @{$_[0]};
1388		1588
1389	# AE::Util has been loaded in signal	1589	_sig_del;
1390	$signal = sig2name $signal;
1391	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1392		1590
1393	$SIG{$signal} \|\|= sub {	1591	delete $SIG_CB{$signal}{$cb};
1394	local $!;	1592
1395	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1593	$HAVE_ASYNC_INTERRUPT
		1594	? delete $SIG_ASY{$signal}
		1595	: # delete doesn't work with older perls - they then
		1596	# print weird messages, or just unconditionally exit
		1597	# instead of getting the default action.
1396	undef $SIG_EV{$signal};	1598	undef $SIG{$signal}
		1599	unless keys %{ $SIG_CB{$signal} };
1397	};	1600	};
1398		1601
1399	# can't do signal processing without introducing races in pure perl,	1602	*_signal_exec = sub {
1400	# so limit the signal latency.	1603	$HAVE_ASYNC_INTERRUPT
1401	_sig_add;	1604	? $SIGPIPE_R->drain
1402	}	1605	: sysread $SIGPIPE_R, (my $dummy), 9;
1403		1606
1404	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"	1607	while (%SIG_EV) {
1405	}	1608	for (keys %SIG_EV) {
1406		1609	delete $SIG_EV{$_};
1407	sub signal {	1610	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1408	# probe for availability of Async::Interrupt	1611	}
1409	if (_have_async_interrupt) {	1612	}
1410	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1411
1412	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1413	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
1414
1415	} else {
1416	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1417
1418	require Fcntl;
1419
1420	if (AnyEvent::WIN32) {
1421	require AnyEvent::Util;
1422
1423	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1424	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1425	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1426	} else {
1427	pipe $SIGPIPE_R, $SIGPIPE_W;
1428	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1429	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1430
1431	# not strictly required, as $^F is normally 2, but let's make sure...
1432	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1433	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1434	}	1613	};
1435
1436	$SIGPIPE_R
1437	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1438
1439	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1440	}	1614	};
		1615	die if $@;
1441		1616
1442	*signal = \&_signal;
1443	&signal	1617	&signal
1444	}
1445
1446	sub AnyEvent::Base::signal::DESTROY {
1447	my ($signal, $cb) = @{$_[0]};
1448
1449	_sig_del;
1450
1451	delete $SIG_CB{$signal}{$cb};
1452
1453	$HAVE_ASYNC_INTERRUPT
1454	? delete $SIG_ASY{$signal}
1455	: # delete doesn't work with older perls - they then
1456	# print weird messages, or just unconditionally exit
1457	# instead of getting the default action.
1458	undef $SIG{$signal}
1459	unless keys %{ $SIG_CB{$signal} };
1460	}	1618	}
1461		1619
1462	# default implementation for ->child	1620	# default implementation for ->child
1463		1621
1464	our %PID_CB;	1622	our %PID_CB;
1465	our $CHLD_W;	1623	our $CHLD_W;
1466	our $CHLD_DELAY_W;	1624	our $CHLD_DELAY_W;
1467	our $WNOHANG;	1625	our $WNOHANG;
1468		1626
		1627	# used by many Impl's
1469	sub _emit_childstatus($$) {	1628	sub _emit_childstatus($$) {
1470	my (undef, $rpid, $rstatus) = @_;	1629	my (undef, $rpid, $rstatus) = @_;
1471		1630
1472	$_->($rpid, $rstatus)	1631	$_->($rpid, $rstatus)
1473	for values %{ $PID_CB{$rpid} \|\| {} },	1632	for values %{ $PID_CB{$rpid} \|\| {} },
1474	values %{ $PID_CB{0} \|\| {} };	1633	values %{ $PID_CB{0} \|\| {} };
1475	}	1634	}
1476		1635
1477	sub _sigchld {
1478	my $pid;
1479
1480	AnyEvent->_emit_childstatus ($pid, $?)
1481	while ($pid = waitpid -1, $WNOHANG) > 0;
1482	}
1483
1484	sub child {	1636	sub child {
		1637	eval q{ # poor man's autoloading {}
		1638	*_sigchld = sub {
		1639	my $pid;
		1640
		1641	AnyEvent->_emit_childstatus ($pid, $?)
		1642	while ($pid = waitpid -1, $WNOHANG) > 0;
		1643	};
		1644
		1645	*child = sub {
1485	my (undef, %arg) = @_;	1646	my (undef, %arg) = @_;
1486		1647
1487	defined (my $pid = $arg{pid} + 0)	1648	defined (my $pid = $arg{pid} + 0)
1488	or Carp::croak "required option 'pid' is missing";	1649	or Carp::croak "required option 'pid' is missing";
1489		1650
1490	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1651	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1491		1652
1492	# WNOHANG is almost cetrainly 1 everywhere	1653	# WNOHANG is almost cetrainly 1 everywhere
1493	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1654	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1494	? 1	1655	? 1
1495	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1656	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1496		1657
1497	unless ($CHLD_W) {	1658	unless ($CHLD_W) {
1498	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1659	$CHLD_W = AE::signal CHLD => \&_sigchld;
1499	# child could be a zombie already, so make at least one round	1660	# child could be a zombie already, so make at least one round
1500	&_sigchld;	1661	&_sigchld;
1501	}	1662	}
1502		1663
1503	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1664	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1504	}	1665	};
1505		1666
1506	sub AnyEvent::Base::child::DESTROY {	1667	*AnyEvent::Base::child::DESTROY = sub {
1507	my ($pid, $cb) = @{$_[0]};	1668	my ($pid, $cb) = @{$_[0]};
1508		1669
1509	delete $PID_CB{$pid}{$cb};	1670	delete $PID_CB{$pid}{$cb};
1510	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1671	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1511		1672
1512	undef $CHLD_W unless keys %PID_CB;	1673	undef $CHLD_W unless keys %PID_CB;
		1674	};
		1675	};
		1676	die if $@;
		1677
		1678	&child
1513	}	1679	}
1514		1680
1515	# idle emulation is done by simply using a timer, regardless	1681	# idle emulation is done by simply using a timer, regardless
1516	# of whether the process is idle or not, and not letting	1682	# of whether the process is idle or not, and not letting
1517	# the callback use more than 50% of the time.	1683	# the callback use more than 50% of the time.
1518	sub idle {	1684	sub idle {
		1685	eval q{ # poor man's autoloading {}
		1686	*idle = sub {
1519	my (undef, %arg) = @_;	1687	my (undef, %arg) = @_;
1520		1688
1521	my ($cb, $w, $rcb) = $arg{cb};	1689	my ($cb, $w, $rcb) = $arg{cb};
1522		1690
1523	$rcb = sub {	1691	$rcb = sub {
1524	if ($cb) {	1692	if ($cb) {
1525	$w = _time;	1693	$w = _time;
1526	&$cb;	1694	&$cb;
1527	$w = _time - $w;	1695	$w = _time - $w;
1528		1696
1529	# never use more then 50% of the time for the idle watcher,	1697	# never use more then 50% of the time for the idle watcher,
1530	# within some limits	1698	# within some limits
1531	$w = 0.0001 if $w < 0.0001;	1699	$w = 0.0001 if $w < 0.0001;
1532	$w = 5 if $w > 5;	1700	$w = 5 if $w > 5;
1533		1701
1534	$w = AnyEvent->timer (after => $w, cb => $rcb);	1702	$w = AE::timer $w, 0, $rcb;
1535	} else {	1703	} else {
1536	# clean up...	1704	# clean up...
1537	undef $w;	1705	undef $w;
1538	undef $rcb;	1706	undef $rcb;
		1707	}
		1708	};
		1709
		1710	$w = AE::timer 0.05, 0, $rcb;
		1711
		1712	bless \\$cb, "AnyEvent::Base::idle"
1539	}	1713	};
		1714
		1715	*AnyEvent::Base::idle::DESTROY = sub {
		1716	undef $${$_[0]};
		1717	};
1540	};	1718	};
		1719	die if $@;
1541		1720
1542	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1721	&idle
1543
1544	bless \\$cb, "AnyEvent::Base::idle"
1545	}
1546
1547	sub AnyEvent::Base::idle::DESTROY {
1548	undef $${$_[0]};
1549	}	1722	}
1550		1723
1551	package AnyEvent::CondVar;	1724	package AnyEvent::CondVar;
1552		1725
1553	our @ISA = AnyEvent::CondVar::Base::;	1726	our @ISA = AnyEvent::CondVar::Base::;
…		…
1601	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1774	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1602	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1775	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1603	}	1776	}
1604		1777
1605	sub cb {	1778	sub cb {
1606	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1779	my $cv = shift;
		1780
		1781	@_
		1782	and $cv->{_ae_cb} = shift
		1783	and $cv->{_ae_sent}
		1784	and (delete $cv->{_ae_cb})->($cv);
		1785
1607	$_[0]{_ae_cb}	1786	$cv->{_ae_cb}
1608	}	1787	}
1609		1788
1610	sub begin {	1789	sub begin {
1611	++$_[0]{_ae_counter};	1790	++$_[0]{_ae_counter};
1612	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1791	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1821	warn "read: $input\n"; # output what has been read	2000	warn "read: $input\n"; # output what has been read
1822	$cv->send if $input =~ /^q/i; # quit program if /^q/i	2001	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1823	},	2002	},
1824	);	2003	);
1825		2004
1826	my $time_watcher; # can only be used once
1827
1828	sub new_timer {
1829	$timer = AnyEvent->timer (after => 1, cb => sub {	2005	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1830	warn "timeout\n"; # print 'timeout' about every second	2006	warn "timeout\n"; # print 'timeout' at most every second
1831	&new_timer; # and restart the time
1832	});	2007	});
1833	}
1834
1835	new_timer; # create first timer
1836		2008
1837	$cv->recv; # wait until user enters /^q/i	2009	$cv->recv; # wait until user enters /^q/i
1838		2010
1839	=head1 REAL-WORLD EXAMPLE	2011	=head1 REAL-WORLD EXAMPLE
1840		2012
…		…
1913		2085
1914	The actual code goes further and collects all errors (C<die>s, exceptions)	2086	The actual code goes further and collects all errors (C<die>s, exceptions)
1915	that occurred during request processing. The C<result> method detects	2087	that occurred during request processing. The C<result> method detects
1916	whether an exception as thrown (it is stored inside the $txn object)	2088	whether an exception as thrown (it is stored inside the $txn object)
1917	and just throws the exception, which means connection errors and other	2089	and just throws the exception, which means connection errors and other
1918	problems get reported tot he code that tries to use the result, not in a	2090	problems get reported to the code that tries to use the result, not in a
1919	random callback.	2091	random callback.
1920		2092
1921	All of this enables the following usage styles:	2093	All of this enables the following usage styles:
1922		2094
1923	1. Blocking:	2095	1. Blocking:
…		…
1971	through AnyEvent. The benchmark creates a lot of timers (with a zero	2143	through AnyEvent. The benchmark creates a lot of timers (with a zero
1972	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2144	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
1973	which it is), lets them fire exactly once and destroys them again.	2145	which it is), lets them fire exactly once and destroys them again.
1974		2146
1975	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2147	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1976	distribution.	2148	distribution. It uses the L<AE> interface, which makes a real difference
		2149	for the EV and Perl backends only.
1977		2150
1978	=head3 Explanation of the columns	2151	=head3 Explanation of the columns
1979		2152
1980	I<watcher> is the number of event watchers created/destroyed. Since	2153	I<watcher> is the number of event watchers created/destroyed. Since
1981	different event models feature vastly different performances, each event	2154	different event models feature vastly different performances, each event
…		…
2002	watcher.	2175	watcher.
2003		2176
2004	=head3 Results	2177	=head3 Results
2005		2178
2006	name watchers bytes create invoke destroy comment	2179	name watchers bytes create invoke destroy comment
2007	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2180	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
2008	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2181	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
2009	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2182	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
2010	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2183	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
2011	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2184	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
2012	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2185	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
2013	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2186	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
2014	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2187	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
2015	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2188	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
2016	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2189	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
2017	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2190	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
2018	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2191	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2019		2192
2020	=head3 Discussion	2193	=head3 Discussion
2021		2194
2022	The benchmark does I<not> measure scalability of the event loop very	2195	The benchmark does I<not> measure scalability of the event loop very
2023	well. For example, a select-based event loop (such as the pure perl one)	2196	well. For example, a select-based event loop (such as the pure perl one)
…		…
2035	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2208	benchmark machine, handling an event takes roughly 1600 CPU cycles with
2036	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2209	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2037	cycles with POE.	2210	cycles with POE.
2038		2211
2039	C<EV> is the sole leader regarding speed and memory use, which are both	2212	C<EV> is the sole leader regarding speed and memory use, which are both
2040	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2213	maximal/minimal, respectively. When using the L<AE> API there is zero
		2214	overhead (when going through the AnyEvent API create is about 5-6 times
		2215	slower, with other times being equal, so still uses far less memory than
2041	far less memory than any other event loop and is still faster than Event	2216	any other event loop and is still faster than Event natively).
2042	natively.
2043		2217
2044	The pure perl implementation is hit in a few sweet spots (both the	2218	The pure perl implementation is hit in a few sweet spots (both the
2045	constant timeout and the use of a single fd hit optimisations in the perl	2219	constant timeout and the use of a single fd hit optimisations in the perl
2046	interpreter and the backend itself). Nevertheless this shows that it	2220	interpreter and the backend itself). Nevertheless this shows that it
2047	adds very little overhead in itself. Like any select-based backend its	2221	adds very little overhead in itself. Like any select-based backend its
…		…
2121	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2295	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2122	(1%) are active. This mirrors the activity of large servers with many	2296	(1%) are active. This mirrors the activity of large servers with many
2123	connections, most of which are idle at any one point in time.	2297	connections, most of which are idle at any one point in time.
2124		2298
2125	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2299	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2126	distribution.	2300	distribution. It uses the L<AE> interface, which makes a real difference
		2301	for the EV and Perl backends only.
2127		2302
2128	=head3 Explanation of the columns	2303	=head3 Explanation of the columns
2129		2304
2130	I<sockets> is the number of sockets, and twice the number of "servers" (as	2305	I<sockets> is the number of sockets, and twice the number of "servers" (as
2131	each server has a read and write socket end).	2306	each server has a read and write socket end).
…		…
2139	a new one that moves the timeout into the future.	2314	a new one that moves the timeout into the future.
2140		2315
2141	=head3 Results	2316	=head3 Results
2142		2317
2143	name sockets create request	2318	name sockets create request
2144	EV 20000 69.01 11.16	2319	EV 20000 62.66 7.99
2145	Perl 20000 73.32 35.87	2320	Perl 20000 68.32 32.64
2146	IOAsync 20000 157.00 98.14 epoll	2321	IOAsync 20000 174.06 101.15 epoll
2147	IOAsync 20000 159.31 616.06 poll	2322	IOAsync 20000 174.67 610.84 poll
2148	Event 20000 212.62 257.32	2323	Event 20000 202.69 242.91
2149	Glib 20000 651.16 1896.30	2324	Glib 20000 557.01 1689.52
2150	POE 20000 349.67 12317.24 uses POE::Loop::Event	2325	POE 20000 341.54 12086.32 uses POE::Loop::Event
2151		2326
2152	=head3 Discussion	2327	=head3 Discussion
2153		2328
2154	This benchmark I<does> measure scalability and overall performance of the	2329	This benchmark I<does> measure scalability and overall performance of the
2155	particular event loop.	2330	particular event loop.
…		…
2281	As you can see, the AnyEvent + EV combination even beats the	2456	As you can see, the AnyEvent + EV combination even beats the
2282	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2457	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2283	backend easily beats IO::Lambda and POE.	2458	backend easily beats IO::Lambda and POE.
2284		2459
2285	And even the 100% non-blocking version written using the high-level (and	2460	And even the 100% non-blocking version written using the high-level (and
2286	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2461	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2287	large margin, even though it does all of DNS, tcp-connect and socket I/O	2462	higher level ("unoptimised") abstractions by a large margin, even though
2288	in a non-blocking way.	2463	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2289		2464
2290	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2465	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2291	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2466	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2292	part of the IO::lambda distribution and were used without any changes.	2467	part of the IO::Lambda distribution and were used without any changes.
2293		2468
2294		2469
2295	=head1 SIGNALS	2470	=head1 SIGNALS
2296		2471
2297	AnyEvent currently installs handlers for these signals:	2472	AnyEvent currently installs handlers for these signals:
…		…
2339	it's built-in modules) are required to use it.	2514	it's built-in modules) are required to use it.
2340		2515
2341	That does not mean that AnyEvent won't take advantage of some additional	2516	That does not mean that AnyEvent won't take advantage of some additional
2342	modules if they are installed.	2517	modules if they are installed.
2343		2518
2344	This section epxlains which additional modules will be used, and how they	2519	This section explains which additional modules will be used, and how they
2345	affect AnyEvent's operetion.	2520	affect AnyEvent's operation.
2346		2521
2347	=over 4	2522	=over 4
2348		2523
2349	=item L<Async::Interrupt>	2524	=item L<Async::Interrupt>
2350		2525
…		…
2355	catch the signals) with some delay (default is 10 seconds, look for	2530	catch the signals) with some delay (default is 10 seconds, look for
2356	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2531	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2357		2532
2358	If this module is available, then it will be used to implement signal	2533	If this module is available, then it will be used to implement signal
2359	catching, which means that signals will not be delayed, and the event loop	2534	catching, which means that signals will not be delayed, and the event loop
2360	will not be interrupted regularly, which is more efficient (And good for	2535	will not be interrupted regularly, which is more efficient (and good for
2361	battery life on laptops).	2536	battery life on laptops).
2362		2537
2363	This affects not just the pure-perl event loop, but also other event loops	2538	This affects not just the pure-perl event loop, but also other event loops
2364	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2539	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2365		2540
…		…
2377	automatic timer adjustments even when no monotonic clock is available,	2552	automatic timer adjustments even when no monotonic clock is available,
2378	can take avdantage of advanced kernel interfaces such as C<epoll> and	2553	can take avdantage of advanced kernel interfaces such as C<epoll> and
2379	C<kqueue>, and is the fastest backend I<by far>. You can even embed	2554	C<kqueue>, and is the fastest backend I<by far>. You can even embed
2380	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).	2555	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
2381		2556
		2557	If you only use backends that rely on another event loop (e.g. C<Tk>),
		2558	then this module will do nothing for you.
		2559
2382	=item L<Guard>	2560	=item L<Guard>
2383		2561
2384	The guard module, when used, will be used to implement	2562	The guard module, when used, will be used to implement
2385	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a	2563	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
2386	lot less memory), but otherwise doesn't affect guard operation much. It is	2564	lot less memory), but otherwise doesn't affect guard operation much. It is
2387	purely used for performance.	2565	purely used for performance.
2388		2566
2389	=item L<JSON> and L<JSON::XS>	2567	=item L<JSON> and L<JSON::XS>
2390		2568
2391	This module is required when you want to read or write JSON data via	2569	One of these modules is required when you want to read or write JSON data
2392	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2570	via L<AnyEvent::Handle>. L<JSON> is also written in pure-perl, but can take
2393	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2571	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2394
2395	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2396	installed.
2397		2572
2398	=item L<Net::SSLeay>	2573	=item L<Net::SSLeay>
2399		2574
2400	Implementing TLS/SSL in Perl is certainly interesting, but not very	2575	Implementing TLS/SSL in Perl is certainly interesting, but not very
2401	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with	2576	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
…		…
2412		2587
2413		2588
2414	=head1 FORK	2589	=head1 FORK
2415		2590
2416	Most event libraries are not fork-safe. The ones who are usually are	2591	Most event libraries are not fork-safe. The ones who are usually are
2417	because they rely on inefficient but fork-safe C<select> or C<poll>	2592	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2418	calls. Only L<EV> is fully fork-aware.	2593	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2594	are usually badly thought-out hacks that are incompatible with fork in
		2595	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2596	continue event-processing in both parent and child (or both, if you know
		2597	what you are doing).
		2598
		2599	This means that, in general, you cannot fork and do event processing in
		2600	the child if the event library was initialised before the fork (which
		2601	usually happens when the first AnyEvent watcher is created, or the library
		2602	is loaded).
2419		2603
2420	If you have to fork, you must either do so I<before> creating your first	2604	If you have to fork, you must either do so I<before> creating your first
2421	watcher OR you must not use AnyEvent at all in the child OR you must do	2605	watcher OR you must not use AnyEvent at all in the child OR you must do
2422	something completely out of the scope of AnyEvent.	2606	something completely out of the scope of AnyEvent.
		2607
		2608	The problem of doing event processing in the parent I<and> the child
		2609	is much more complicated: even for backends that I<are> fork-aware or
		2610	fork-safe, their behaviour is not usually what you want: fork clones all
		2611	watchers, that means all timers, I/O watchers etc. are active in both
		2612	parent and child, which is almost never what you want. USing C<exec>
		2613	to start worker children from some kind of manage rprocess is usually
		2614	preferred, because it is much easier and cleaner, at the expense of having
		2615	to have another binary.
2423		2616
2424		2617
2425	=head1 SECURITY CONSIDERATIONS	2618	=head1 SECURITY CONSIDERATIONS
2426		2619
2427	AnyEvent can be forced to load any event model via	2620	AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.264 by root, Wed Jul 29 12:42:09 2009 UTC vs. Revision 1.328 by root, Tue Jun 8 10:06:15 2010 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.264 by root, Wed Jul 29 12:42:09 2009 UTC vs.
Revision 1.328 by root, Tue Jun 8 10:06:15 2010 UTC