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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.247 by root, Sat Jul 18 22:24:17 2009 UTC vs.
Revision 1.317 by root, Wed Mar 24 21:22:57 2010 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - provide framework for multiple event loops	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt
6	event loops.	6	and POE are various supported event loops/environments.
7		7
8	=head1 SYNOPSIS	8	=head1 SYNOPSIS
9		9
10	use AnyEvent;	10	use AnyEvent;
11		11
40	=head1 INTRODUCTION/TUTORIAL	40	=head1 INTRODUCTION/TUTORIAL
41		41
42	This manpage is mainly a reference manual. If you are interested	42	This manpage is mainly a reference manual. If you are interested
43	in a tutorial or some gentle introduction, have a look at the	43	in a tutorial or some gentle introduction, have a look at the
44	L<AnyEvent::Intro> manpage.	44	L<AnyEvent::Intro> manpage.
		45
		46	=head1 SUPPORT
		47
		48	There is a mailinglist for discussing all things AnyEvent, and an IRC
		49	channel, too.
		50
		51	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software
		52	Repository>, at L<http://anyevent.schmorp.de>, for more info.
45		53
46	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)	54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
47		55
48	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen	56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
49	nowadays. So what is different about AnyEvent?	57	nowadays. So what is different about AnyEvent?
…		…
173	my variables are only visible after the statement in which they are	181	my variables are only visible after the statement in which they are
174	declared.	182	declared.
175		183
176	=head2 I/O WATCHERS	184	=head2 I/O WATCHERS
177		185
		186	$w = AnyEvent->io (
		187	fh => <filehandle_or_fileno>,
		188	poll => <"r" or "w">,
		189	cb => <callback>,
		190	);
		191
178	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	192	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
179	with the following mandatory key-value pairs as arguments:	193	with the following mandatory key-value pairs as arguments:
180		194
181	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch	195	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
182	for events (AnyEvent might or might not keep a reference to this file	196	for events (AnyEvent might or might not keep a reference to this file
…		…
211	undef $w;	225	undef $w;
212	});	226	});
213		227
214	=head2 TIME WATCHERS	228	=head2 TIME WATCHERS
215		229
		230	$w = AnyEvent->timer (after => <seconds>, cb => <callback>);
		231
		232	$w = AnyEvent->timer (
		233	after => <fractional_seconds>,
		234	interval => <fractional_seconds>,
		235	cb => <callback>,
		236	);
		237
216	You can create a time watcher by calling the C<< AnyEvent->timer >>	238	You can create a time watcher by calling the C<< AnyEvent->timer >>
217	method with the following mandatory arguments:	239	method with the following mandatory arguments:
218		240
219	C<after> specifies after how many seconds (fractional values are	241	C<after> specifies after how many seconds (fractional values are
220	supported) the callback should be invoked. C<cb> is the callback to invoke	242	supported) the callback should be invoked. C<cb> is the callback to invoke
…		…
341	might affect timers and time-outs.	363	might affect timers and time-outs.
342		364
343	When this is the case, you can call this method, which will update the	365	When this is the case, you can call this method, which will update the
344	event loop's idea of "current time".	366	event loop's idea of "current time".
345		367
		368	A typical example would be a script in a web server (e.g. C<mod_perl>) -
		369	when mod_perl executes the script, then the event loop will have the wrong
		370	idea about the "current time" (being potentially far in the past, when the
		371	script ran the last time). In that case you should arrange a call to C<<
		372	AnyEvent->now_update >> each time the web server process wakes up again
		373	(e.g. at the start of your script, or in a handler).
		374
346	Note that updating the time I<might> cause some events to be handled.	375	Note that updating the time I<might> cause some events to be handled.
347		376
348	=back	377	=back
349		378
350	=head2 SIGNAL WATCHERS	379	=head2 SIGNAL WATCHERS
		380
		381	$w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>);
351		382
352	You can watch for signals using a signal watcher, C<signal> is the signal	383	You can watch for signals using a signal watcher, C<signal> is the signal
353	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl	384	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl
354	callback to be invoked whenever a signal occurs.	385	callback to be invoked whenever a signal occurs.
355		386
…		…
372		403
373	Example: exit on SIGINT	404	Example: exit on SIGINT
374		405
375	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	406	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
376		407
		408	=head3 Restart Behaviour
		409
		410	While restart behaviour is up to the event loop implementation, most will
		411	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		412	pure perl implementation).
		413
		414	=head3 Safe/Unsafe Signals
		415
		416	Perl signals can be either "safe" (synchronous to opcode handling) or
		417	"unsafe" (asynchronous) - the former might get delayed indefinitely, the
		418	latter might corrupt your memory.
		419
		420	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		421	i.e. they will not interrupt your running perl program but will only be
		422	called as part of the normal event handling (just like timer, I/O etc.
		423	callbacks, too).
		424
377	=head3 Signal Races, Delays and Workarounds	425	=head3 Signal Races, Delays and Workarounds
378		426
379	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	427	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
380	callbacks to signals in a generic way, which is a pity, as you cannot do	428	callbacks to signals in a generic way, which is a pity, as you cannot
381	race-free signal handling in perl. AnyEvent will try to do it's best, but	429	do race-free signal handling in perl, requiring C libraries for
		430	this. AnyEvent will try to do it's best, which means in some cases,
382	in some cases, signals will be delayed. The maximum time a signal might	431	signals will be delayed. The maximum time a signal might be delayed is
383	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10	432	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This
384	seconds). This variable can be changed only before the first signal	433	variable can be changed only before the first signal watcher is created,
385	watcher is created, and should be left alone otherwise. Higher values	434	and should be left alone otherwise. This variable determines how often
		435	AnyEvent polls for signals (in case a wake-up was missed). Higher values
386	will cause fewer spurious wake-ups, which is better for power and CPU	436	will cause fewer spurious wake-ups, which is better for power and CPU
		437	saving.
		438
387	saving. All these problems can be avoided by installing the optional	439	All these problems can be avoided by installing the optional
388	L<Async::Interrupt> module. This will not work with inherently broken	440	L<Async::Interrupt> module, which works with most event loops. It will not
389	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>	441	work with inherently broken event loops such as L<Event> or L<Event::Lib>
390	currently, as POE does it's own workaround with one-second latency). With	442	(and not with L<POE> currently, as POE does it's own workaround with
391	those, you just have to suffer the delays.	443	one-second latency). For those, you just have to suffer the delays.
392		444
393	=head2 CHILD PROCESS WATCHERS	445	=head2 CHILD PROCESS WATCHERS
394		446
		447	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
		448
395	You can also watch on a child process exit and catch its exit status.	449	You can also watch on a child process exit and catch its exit status.
396		450
397	The child process is specified by the C<pid> argument (if set to C<0>, it	451	The child process is specified by the C<pid> argument (one some backends,
398	watches for any child process exit). The watcher will triggered only when	452	using C<0> watches for any child process exit, on others this will
399	the child process has finished and an exit status is available, not on	453	croak). The watcher will be triggered only when the child process has
400	any trace events (stopped/continued).	454	finished and an exit status is available, not on any trace events
		455	(stopped/continued).
401		456
402	The callback will be called with the pid and exit status (as returned by	457	The callback will be called with the pid and exit status (as returned by
403	waitpid), so unlike other watcher types, you I<can> rely on child watcher	458	waitpid), so unlike other watcher types, you I<can> rely on child watcher
404	callback arguments.	459	callback arguments.
405		460
…		…
446	# do something else, then wait for process exit	501	# do something else, then wait for process exit
447	$done->recv;	502	$done->recv;
448		503
449	=head2 IDLE WATCHERS	504	=head2 IDLE WATCHERS
450		505
451	Sometimes there is a need to do something, but it is not so important	506	$w = AnyEvent->idle (cb => <callback>);
452	to do it instantly, but only when there is nothing better to do. This
453	"nothing better to do" is usually defined to be "no other events need
454	attention by the event loop".
455		507
456	Idle watchers ideally get invoked when the event loop has nothing	508	Repeatedly invoke the callback after the process becomes idle, until
457	better to do, just before it would block the process to wait for new	509	either the watcher is destroyed or new events have been detected.
458	events. Instead of blocking, the idle watcher is invoked.
459		510
460	Most event loops unfortunately do not really support idle watchers (only	511	Idle watchers are useful when there is a need to do something, but it
		512	is not so important (or wise) to do it instantly. The callback will be
		513	invoked only when there is "nothing better to do", which is usually
		514	defined as "all outstanding events have been handled and no new events
		515	have been detected". That means that idle watchers ideally get invoked
		516	when the event loop has just polled for new events but none have been
		517	detected. Instead of blocking to wait for more events, the idle watchers
		518	will be invoked.
		519
		520	Unfortunately, most event loops do not really support idle watchers (only
461	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	521	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
462	will simply call the callback "from time to time".	522	will simply call the callback "from time to time".
463		523
464	Example: read lines from STDIN, but only process them when the	524	Example: read lines from STDIN, but only process them when the
465	program is otherwise idle:	525	program is otherwise idle:
…		…
481	});	541	});
482	});	542	});
483		543
484	=head2 CONDITION VARIABLES	544	=head2 CONDITION VARIABLES
485		545
		546	$cv = AnyEvent->condvar;
		547
		548	$cv->send (<list>);
		549	my @res = $cv->recv;
		550
486	If you are familiar with some event loops you will know that all of them	551	If you are familiar with some event loops you will know that all of them
487	require you to run some blocking "loop", "run" or similar function that	552	require you to run some blocking "loop", "run" or similar function that
488	will actively watch for new events and call your callbacks.	553	will actively watch for new events and call your callbacks.
489		554
490	AnyEvent is slightly different: it expects somebody else to run the event	555	AnyEvent is slightly different: it expects somebody else to run the event
…		…
509	Condition variables are similar to callbacks, except that you can	574	Condition variables are similar to callbacks, except that you can
510	optionally wait for them. They can also be called merge points - points	575	optionally wait for them. They can also be called merge points - points
511	in time where multiple outstanding events have been processed. And yet	576	in time where multiple outstanding events have been processed. And yet
512	another way to call them is transactions - each condition variable can be	577	another way to call them is transactions - each condition variable can be
513	used to represent a transaction, which finishes at some point and delivers	578	used to represent a transaction, which finishes at some point and delivers
514	a result.	579	a result. And yet some people know them as "futures" - a promise to
		580	compute/deliver something that you can wait for.
515		581
516	Condition variables are very useful to signal that something has finished,	582	Condition variables are very useful to signal that something has finished,
517	for example, if you write a module that does asynchronous http requests,	583	for example, if you write a module that does asynchronous http requests,
518	then a condition variable would be the ideal candidate to signal the	584	then a condition variable would be the ideal candidate to signal the
519	availability of results. The user can either act when the callback is	585	availability of results. The user can either act when the callback is
…		…
553	after => 1,	619	after => 1,
554	cb => sub { $result_ready->send },	620	cb => sub { $result_ready->send },
555	);	621	);
556		622
557	# this "blocks" (while handling events) till the callback	623	# this "blocks" (while handling events) till the callback
558	# calls -<send	624	# calls ->send
559	$result_ready->recv;	625	$result_ready->recv;
560		626
561	Example: wait for a timer, but take advantage of the fact that condition	627	Example: wait for a timer, but take advantage of the fact that condition
562	variables are also callable directly.	628	variables are also callable directly.
563		629
…		…
627	one. For example, a function that pings many hosts in parallel might want	693	one. For example, a function that pings many hosts in parallel might want
628	to use a condition variable for the whole process.	694	to use a condition variable for the whole process.
629		695
630	Every call to C<< ->begin >> will increment a counter, and every call to	696	Every call to C<< ->begin >> will increment a counter, and every call to
631	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	697	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
632	>>, the (last) callback passed to C<begin> will be executed. That callback	698	>>, the (last) callback passed to C<begin> will be executed, passing the
633	is I<supposed> to call C<< ->send >>, but that is not required. If no	699	condvar as first argument. That callback is I<supposed> to call C<< ->send
634	callback was set, C<send> will be called without any arguments.	700	>>, but that is not required. If no group callback was set, C<send> will
		701	be called without any arguments.
635		702
636	You can think of C<< $cv->send >> giving you an OR condition (one call	703	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	704	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).	705	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
639		706
…		…
666	begung can potentially be zero:	733	begung can potentially be zero:
667		734
668	my $cv = AnyEvent->condvar;	735	my $cv = AnyEvent->condvar;
669		736
670	my %result;	737	my %result;
671	$cv->begin (sub { $cv->send (\%result) });	738	$cv->begin (sub { shift->send (\%result) });
672		739
673	for my $host (@list_of_hosts) {	740	for my $host (@list_of_hosts) {
674	$cv->begin;	741	$cv->begin;
675	ping_host_then_call_callback $host, sub {	742	ping_host_then_call_callback $host, sub {
676	$result{$host} = ...;	743	$result{$host} = ...;
…		…
751	=item $cb = $cv->cb ($cb->($cv))	818	=item $cb = $cv->cb ($cb->($cv))
752		819
753	This is a mutator function that returns the callback set and optionally	820	This is a mutator function that returns the callback set and optionally
754	replaces it before doing so.	821	replaces it before doing so.
755		822
756	The callback will be called when the condition becomes "true", i.e. when	823	The callback will be called when the condition becomes (or already was)
757	C<send> or C<croak> are called, with the only argument being the condition	824	"true", i.e. when C<send> or C<croak> are called (or were called), with
758	variable itself. Calling C<recv> inside the callback or at any later time	825	the only argument being the condition variable itself. Calling C<recv>
759	is guaranteed not to block.	826	inside the callback or at any later time is guaranteed not to block.
760		827
761	=back	828	=back
762		829
763	=head1 SUPPORTED EVENT LOOPS/BACKENDS	830	=head1 SUPPORTED EVENT LOOPS/BACKENDS
764		831
…		…
767	=over 4	834	=over 4
768		835
769	=item Backends that are autoprobed when no other event loop can be found.	836	=item Backends that are autoprobed when no other event loop can be found.
770		837
771	EV is the preferred backend when no other event loop seems to be in	838	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	839	use. If EV is not installed, then AnyEvent will fall back to its own
773	that, will fall back to its own pure-perl implementation, which is	840	pure-perl implementation, which is available everywhere as it comes with
774	available everywhere as it comes with AnyEvent itself.	841	AnyEvent itself.
775		842
776	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	843	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.	844	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
779		845
780	=item Backends that are transparently being picked up when they are used.	846	=item Backends that are transparently being picked up when they are used.
781		847
782	These will be used when they are currently loaded when the first watcher	848	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	849	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	850	them. This means that AnyEvent will automatically pick the right backend
785	when the main program loads an event module before anything starts to	851	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.	852	create watchers. Nothing special needs to be done by the main program.
787		853
		854	AnyEvent::Impl::Event based on Event, very stable, few glitches.
788	AnyEvent::Impl::Glib based on Glib, slow but very stable.	855	AnyEvent::Impl::Glib based on Glib, slow but very stable.
789	AnyEvent::Impl::Tk based on Tk, very broken.	856	AnyEvent::Impl::Tk based on Tk, very broken.
790	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	857	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
791	AnyEvent::Impl::POE based on POE, very slow, some limitations.	858	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		859	AnyEvent::Impl::Irssi used when running within irssi.
792		860
793	=item Backends with special needs.	861	=item Backends with special needs.
794		862
795	Qt requires the Qt::Application to be instantiated first, but will	863	Qt requires the Qt::Application to be instantiated first, but will
796	otherwise be picked up automatically. As long as the main program	864	otherwise be picked up automatically. As long as the main program
…		…
870	event module detection too early, for example, L<AnyEvent::AIO> creates	938	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	939	and installs the global L<IO::AIO> watcher in a C<post_detect> block to
872	avoid autodetecting the event module at load time.	940	avoid autodetecting the event module at load time.
873		941
874	If called in scalar or list context, then it creates and returns an object	942	If called in scalar or list context, then it creates and returns an object
875	that automatically removes the callback again when it is destroyed. See	943	that automatically removes the callback again when it is destroyed (or
		944	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for
876	L<Coro::BDB> for a case where this is useful.	945	a case where this is useful.
		946
		947	Example: Create a watcher for the IO::AIO module and store it in
		948	C<$WATCHER>. Only do so after the event loop is initialised, though.
		949
		950	our WATCHER;
		951
		952	my $guard = AnyEvent::post_detect {
		953	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);
		954	};
		955
		956	# the \|\|= is important in case post_detect immediately runs the block,
		957	# as to not clobber the newly-created watcher. assigning both watcher and
		958	# post_detect guard to the same variable has the advantage of users being
		959	# able to just C<undef $WATCHER> if the watcher causes them grief.
		960
		961	$WATCHER \|\|= $guard;
877		962
878	=item @AnyEvent::post_detect	963	=item @AnyEvent::post_detect
879		964
880	If there are any code references in this array (you can C<push> to it	965	If there are any code references in this array (you can C<push> to it
881	before or after loading AnyEvent), then they will called directly after	966	before or after loading AnyEvent), then they will called directly after
…		…
884	You should check C<$AnyEvent::MODEL> before adding to this array, though:	969	You should check C<$AnyEvent::MODEL> before adding to this array, though:
885	if it is defined then the event loop has already been detected, and the	970	if it is defined then the event loop has already been detected, and the
886	array will be ignored.	971	array will be ignored.
887		972
888	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	973	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
889	it,as it takes care of these details.	974	it, as it takes care of these details.
890		975
891	This variable is mainly useful for modules that can do something useful	976	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	977	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	978	not need to even load it by default. This array provides the means to hook
894	into AnyEvent passively, without loading it.	979	into AnyEvent passively, without loading it.
		980
		981	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		982	together, you could put this into Coro (this is the actual code used by
		983	Coro to accomplish this):
		984
		985	if (defined $AnyEvent::MODEL) {
		986	# AnyEvent already initialised, so load Coro::AnyEvent
		987	require Coro::AnyEvent;
		988	} else {
		989	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		990	# as soon as it is
		991	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		992	}
895		993
896	=back	994	=back
897		995
898	=head1 WHAT TO DO IN A MODULE	996	=head1 WHAT TO DO IN A MODULE
899		997
…		…
1048		1146
1049	package AnyEvent;	1147	package AnyEvent;
1050		1148
1051	# basically a tuned-down version of common::sense	1149	# basically a tuned-down version of common::sense
1052	sub common_sense {	1150	sub common_sense {
1053	# no warnings	1151	# from common:.sense 1.0
1054	${^WARNING_BITS} ^= ${^WARNING_BITS};	1152	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1055	# use strict vars subs	1153	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1056	$^H \|= 0x00000600;	1154	$^H \|= 0x00000600;
1057	}	1155	}
1058		1156
1059	BEGIN { AnyEvent::common_sense }	1157	BEGIN { AnyEvent::common_sense }
1060		1158
1061	use Carp ();	1159	use Carp ();
1062		1160
1063	our $VERSION = 4.85;	1161	our $VERSION = '5.251';
1064	our $MODEL;	1162	our $MODEL;
1065		1163
1066	our $AUTOLOAD;	1164	our $AUTOLOAD;
1067	our @ISA;	1165	our @ISA;
1068		1166
1069	our @REGISTRY;	1167	our @REGISTRY;
1070		1168
1071	our $WIN32;
1072
1073	our $VERBOSE;	1169	our $VERBOSE;
1074		1170
1075	BEGIN {	1171	BEGIN {
1076	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1172	require "AnyEvent/constants.pl";
		1173
1077	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1174	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1078		1175
1079	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1176	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1080	if ${^TAINT};	1177	if ${^TAINT};
1081		1178
1082	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1179	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1093	for reverse split /\s,\s/,	1190	for reverse split /\s,\s/,
1094	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1191	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1095	}	1192	}
1096		1193
1097	my @models = (	1194	my @models = (
1098	[EV:: => AnyEvent::Impl::EV::],	1195	[EV:: => AnyEvent::Impl::EV:: , 1],
1099	[Event:: => AnyEvent::Impl::Event::],
1100	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1196	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1101	# everything below here will not be autoprobed	1197	# everything below here will not (normally) be autoprobed
1102	# as the pureperl backend should work everywhere	1198	# as the pureperl backend should work everywhere
1103	# and is usually faster	1199	# and is usually faster
		1200	[Event:: => AnyEvent::Impl::Event::, 1],
1104	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1201	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1105	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1202	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1203	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1106	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1204	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1107	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1205	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1108	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1206	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1109	[Wx:: => AnyEvent::Impl::POE::],	1207	[Wx:: => AnyEvent::Impl::POE::],
1110	[Prima:: => AnyEvent::Impl::POE::],	1208	[Prima:: => AnyEvent::Impl::POE::],
1111	# IO::Async is just too broken - we would need workarounds for its	1209	# IO::Async is just too broken - we would need workarounds for its
1112	# byzantine signal and broken child handling, among others.	1210	# byzantine signal and broken child handling, among others.
1113	# IO::Async is rather hard to detect, as it doesn't have any	1211	# IO::Async is rather hard to detect, as it doesn't have any
1114	# obvious default class.	1212	# obvious default class.
1115	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1213	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1116	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1214	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1117	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1215	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1216	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1118	);	1217	);
1119		1218
1120	our %method = map +($_ => 1),	1219	our %method = map +($_ => 1),
1121	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1220	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1122		1221
1123	our @post_detect;	1222	our @post_detect;
1124		1223
1125	sub post_detect(&) {	1224	sub post_detect(&) {
1126	my ($cb) = @_;	1225	my ($cb) = @_;
1127		1226
1128	if ($MODEL) {
1129	$cb->();
1130
1131	1
1132	} else {
1133	push @post_detect, $cb;	1227	push @post_detect, $cb;
1134		1228
1135	defined wantarray	1229	defined wantarray
1136	? bless \$cb, "AnyEvent::Util::postdetect"	1230	? bless \$cb, "AnyEvent::Util::postdetect"
1137	: ()	1231	: ()
1138	}
1139	}	1232	}
1140		1233
1141	sub AnyEvent::Util::postdetect::DESTROY {	1234	sub AnyEvent::Util::postdetect::DESTROY {
1142	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1235	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1143	}	1236	}
1144		1237
1145	sub detect() {	1238	sub detect() {
		1239	# free some memory
		1240	*detect = sub () { $MODEL };
		1241
		1242	local $!; # for good measure
		1243	local $SIG{__DIE__};
		1244
		1245	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1246	my $model = "AnyEvent::Impl::$1";
		1247	if (eval "require $model") {
		1248	$MODEL = $model;
		1249	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1250	} else {
		1251	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1252	}
		1253	}
		1254
		1255	# check for already loaded models
1146	unless ($MODEL) {	1256	unless ($MODEL) {
1147	local $SIG{__DIE__};	1257	for (@REGISTRY, @models) {
1148		1258	my ($package, $model) = @$_;
1149	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1259	if (${"$package\::VERSION"} > 0) {
1150	my $model = "AnyEvent::Impl::$1";
1151	if (eval "require $model") {	1260	if (eval "require $model") {
1152	$MODEL = $model;	1261	$MODEL = $model;
1153	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1262	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1154	} else {	1263	last;
1155	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1264	}
1156	}	1265	}
1157	}	1266	}
1158		1267
1159	# check for already loaded models
1160	unless ($MODEL) {	1268	unless ($MODEL) {
		1269	# try to autoload a model
1161	for (@REGISTRY, @models) {	1270	for (@REGISTRY, @models) {
1162	my ($package, $model) = @$_;	1271	my ($package, $model, $autoload) = @$_;
		1272	if (
		1273	$autoload
		1274	and eval "require $package"
1163	if (${"$package\::VERSION"} > 0) {	1275	and ${"$package\::VERSION"} > 0
1164	if (eval "require $model") {	1276	and eval "require $model"
		1277	) {
1165	$MODEL = $model;	1278	$MODEL = $model;
1166	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1279	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1167	last;	1280	last;
1168	}
1169	}	1281	}
1170	}	1282	}
1171		1283
1172	unless ($MODEL) {
1173	# try to load a model
1174
1175	for (@REGISTRY, @models) {
1176	my ($package, $model) = @$_;
1177	if (eval "require $package"
1178	and ${"$package\::VERSION"} > 0
1179	and eval "require $model") {
1180	$MODEL = $model;
1181	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;
1182	last;
1183	}
1184	}
1185
1186	$MODEL	1284	$MODEL
1187	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1285	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1188	}
1189	}	1286	}
1190
1191	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1192
1193	unshift @ISA, $MODEL;
1194
1195	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1196
1197	(shift @post_detect)->() while @post_detect;
1198	}	1287	}
		1288
		1289	@models = (); # free probe data
		1290
		1291	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1292	unshift @ISA, $MODEL;
		1293
		1294	# now nuke some methods that are overriden by the backend.
		1295	# SUPER is not allowed.
		1296	for (qw(time signal child idle)) {
		1297	undef &{"AnyEvent::Base::$_"}
		1298	if defined &{"$MODEL\::$_"};
		1299	}
		1300
		1301	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1302
		1303	(shift @post_detect)->() while @post_detect;
		1304
		1305	*post_detect = sub(&) {
		1306	shift->();
		1307
		1308	undef
		1309	};
1199		1310
1200	$MODEL	1311	$MODEL
1201	}	1312	}
1202		1313
1203	sub AUTOLOAD {	1314	sub AUTOLOAD {
1204	(my $func = $AUTOLOAD) =~ s/.*://;	1315	(my $func = $AUTOLOAD) =~ s/.*://;
1205		1316
1206	$method{$func}	1317	$method{$func}
1207	or Carp::croak "$func: not a valid method for AnyEvent objects";	1318	or Carp::croak "$func: not a valid AnyEvent class method";
1208		1319
1209	detect unless $MODEL;	1320	detect;
1210		1321
1211	my $class = shift;	1322	my $class = shift;
1212	$class->$func (@_);	1323	$class->$func (@_);
1213	}	1324	}
1214		1325
…		…
1227	# we assume CLOEXEC is already set by perl in all important cases	1338	# we assume CLOEXEC is already set by perl in all important cases
1228		1339
1229	($fh2, $rw)	1340	($fh2, $rw)
1230	}	1341	}
1231		1342
		1343	=head1 SIMPLIFIED AE API
		1344
		1345	Starting with version 5.0, AnyEvent officially supports a second, much
		1346	simpler, API that is designed to reduce the calling, typing and memory
		1347	overhead.
		1348
		1349	See the L<AE> manpage for details.
		1350
		1351	=cut
		1352
		1353	package AE;
		1354
		1355	our $VERSION = $AnyEvent::VERSION;
		1356
		1357	sub io($$$) {
		1358	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1359	}
		1360
		1361	sub timer($$$) {
		1362	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1363	}
		1364
		1365	sub signal($$) {
		1366	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1367	}
		1368
		1369	sub child($$) {
		1370	AnyEvent->child (pid => $_[0], cb => $_[1])
		1371	}
		1372
		1373	sub idle($) {
		1374	AnyEvent->idle (cb => $_[0])
		1375	}
		1376
		1377	sub cv(;&) {
		1378	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1379	}
		1380
		1381	sub now() {
		1382	AnyEvent->now
		1383	}
		1384
		1385	sub now_update() {
		1386	AnyEvent->now_update
		1387	}
		1388
		1389	sub time() {
		1390	AnyEvent->time
		1391	}
		1392
1232	package AnyEvent::Base;	1393	package AnyEvent::Base;
1233		1394
1234	# default implementations for many methods	1395	# default implementations for many methods
1235		1396
1236	sub _time {	1397	sub time {
		1398	eval q{ # poor man's autoloading {}
1237	# probe for availability of Time::HiRes	1399	# probe for availability of Time::HiRes
1238	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1400	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1239	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1401	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1240	*_time = \&Time::HiRes::time;	1402	*AE::time = \&Time::HiRes::time;
1241	# if (eval "use POSIX (); (POSIX::times())...	1403	# if (eval "use POSIX (); (POSIX::times())...
1242	} else {	1404	} else {
1243	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1405	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1244	*_time = sub { time }; # epic fail	1406	*AE::time = sub (){ time }; # epic fail
		1407	}
		1408
		1409	*time = sub { AE::time }; # different prototypes
1245	}	1410	};
		1411	die if $@;
1246		1412
1247	&_time	1413	&time
1248	}	1414	}
1249		1415
1250	sub time { _time }	1416	*now = \&time;
1251	sub now { _time }	1417
1252	sub now_update { }	1418	sub now_update { }
1253		1419
1254	# default implementation for ->condvar	1420	# default implementation for ->condvar
1255		1421
1256	sub condvar {	1422	sub condvar {
		1423	eval q{ # poor man's autoloading {}
		1424	*condvar = sub {
1257	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1425	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
		1426	};
		1427
		1428	*AE::cv = sub (;&) {
		1429	bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar"
		1430	};
		1431	};
		1432	die if $@;
		1433
		1434	&condvar
1258	}	1435	}
1259		1436
1260	# default implementation for ->signal	1437	# default implementation for ->signal
1261		1438
1262	our $HAVE_ASYNC_INTERRUPT;	1439	our $HAVE_ASYNC_INTERRUPT;
		1440
		1441	sub _have_async_interrupt() {
		1442	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1443	&& eval "use Async::Interrupt 1.02 (); 1")
		1444	unless defined $HAVE_ASYNC_INTERRUPT;
		1445
		1446	$HAVE_ASYNC_INTERRUPT
		1447	}
		1448
1263	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1449	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1264	our (%SIG_ASY, %SIG_ASY_W);	1450	our (%SIG_ASY, %SIG_ASY_W);
1265	our ($SIG_COUNT, $SIG_TW);	1451	our ($SIG_COUNT, $SIG_TW);
1266		1452
1267	sub _signal_exec {
1268	$HAVE_ASYNC_INTERRUPT
1269	? $SIGPIPE_R->drain
1270	: sysread $SIGPIPE_R, my $dummy, 9;
1271
1272	while (%SIG_EV) {
1273	for (keys %SIG_EV) {
1274	delete $SIG_EV{$_};
1275	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1276	}
1277	}
1278	}
1279
1280	# install a dumym wakeupw atcher to reduce signal catching latency	1453	# install a dummy wakeup watcher to reduce signal catching latency
		1454	# used by Impls
1281	sub _sig_add() {	1455	sub _sig_add() {
1282	unless ($SIG_COUNT++) {	1456	unless ($SIG_COUNT++) {
1283	# try to align timer on a full-second boundary, if possible	1457	# try to align timer on a full-second boundary, if possible
1284	my $NOW = AnyEvent->now;	1458	my $NOW = AE::now;
1285		1459
1286	$SIG_TW = AnyEvent->timer (	1460	$SIG_TW = AE::timer
1287	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1461	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1288	interval => $MAX_SIGNAL_LATENCY,	1462	$MAX_SIGNAL_LATENCY,
1289	cb => sub { }, # just for the PERL_ASYNC_CHECK	1463	sub { } # just for the PERL_ASYNC_CHECK
1290	);	1464	;
1291	}	1465	}
1292	}	1466	}
1293		1467
1294	sub _sig_del {	1468	sub _sig_del {
1295	undef $SIG_TW	1469	undef $SIG_TW
1296	unless --$SIG_COUNT;	1470	unless --$SIG_COUNT;
1297	}	1471	}
1298		1472
		1473	our $_sig_name_init; $_sig_name_init = sub {
		1474	eval q{ # poor man's autoloading {}
		1475	undef $_sig_name_init;
		1476
		1477	if (_have_async_interrupt) {
		1478	*sig2num = \&Async::Interrupt::sig2num;
		1479	*sig2name = \&Async::Interrupt::sig2name;
		1480	} else {
		1481	require Config;
		1482
		1483	my %signame2num;
		1484	@signame2num{ split ' ', $Config::Config{sig_name} }
		1485	= split ' ', $Config::Config{sig_num};
		1486
		1487	my @signum2name;
		1488	@signum2name[values %signame2num] = keys %signame2num;
		1489
		1490	*sig2num = sub($) {
		1491	$_[0] > 0 ? shift : $signame2num{+shift}
		1492	};
		1493	*sig2name = sub ($) {
		1494	$_[0] > 0 ? $signum2name[+shift] : shift
		1495	};
		1496	}
		1497	};
		1498	die if $@;
		1499	};
		1500
		1501	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1502	sub sig2name($) { &$_sig_name_init; &sig2name }
		1503
1299	sub _signal {	1504	sub signal {
1300	my (undef, %arg) = @_;	1505	eval q{ # poor man's autoloading {}
		1506	# probe for availability of Async::Interrupt
		1507	if (_have_async_interrupt) {
		1508	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1301		1509
1302	my $signal = uc $arg{signal}	1510	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1303	or Carp::croak "required option 'signal' is missing";	1511	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1304		1512
1305	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1513	} else {
		1514	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1306		1515
1307	if ($HAVE_ASYNC_INTERRUPT) {	1516	if (AnyEvent::WIN32) {
1308	# async::interrupt	1517	require AnyEvent::Util;
1309		1518
1310	$SIG_ASY{$signal} \|\|= do {	1519	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1311	my $asy = new Async::Interrupt	1520	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
1312	cb => sub { undef $SIG_EV{$signal} },	1521	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
1313	signal => $signal,	1522	} else {
1314	pipe => [$SIGPIPE_R->filenos],	1523	pipe $SIGPIPE_R, $SIGPIPE_W;
		1524	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
		1525	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
		1526
		1527	# not strictly required, as $^F is normally 2, but let's make sure...
		1528	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1529	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1315	;	1530	}
1316	$asy->pipe_autodrain (0);
1317		1531
1318	$asy	1532	$SIGPIPE_R
		1533	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1534
		1535	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1536	}
		1537
		1538	*signal = $HAVE_ASYNC_INTERRUPT
		1539	? sub {
		1540	my (undef, %arg) = @_;
		1541
		1542	# async::interrupt
		1543	my $signal = sig2num $arg{signal};
		1544	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1545
		1546	$SIG_ASY{$signal} \|\|= new Async::Interrupt
		1547	cb => sub { undef $SIG_EV{$signal} },
		1548	signal => $signal,
		1549	pipe => [$SIGPIPE_R->filenos],
		1550	pipe_autodrain => 0,
		1551	;
		1552
		1553	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1554	}
		1555	: sub {
		1556	my (undef, %arg) = @_;
		1557
		1558	# pure perl
		1559	my $signal = sig2name $arg{signal};
		1560	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1561
		1562	$SIG{$signal} \|\|= sub {
		1563	local $!;
		1564	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1565	undef $SIG_EV{$signal};
		1566	};
		1567
		1568	# can't do signal processing without introducing races in pure perl,
		1569	# so limit the signal latency.
		1570	_sig_add;
		1571
		1572	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1573	}
		1574	;
		1575
		1576	*AnyEvent::Base::signal::DESTROY = sub {
		1577	my ($signal, $cb) = @{$_[0]};
		1578
		1579	_sig_del;
		1580
		1581	delete $SIG_CB{$signal}{$cb};
		1582
		1583	$HAVE_ASYNC_INTERRUPT
		1584	? delete $SIG_ASY{$signal}
		1585	: # delete doesn't work with older perls - they then
		1586	# print weird messages, or just unconditionally exit
		1587	# instead of getting the default action.
		1588	undef $SIG{$signal}
		1589	unless keys %{ $SIG_CB{$signal} };
1319	};	1590	};
1320		1591
1321	} else {	1592	*_signal_exec = sub {
1322	# pure perl	1593	$HAVE_ASYNC_INTERRUPT
		1594	? $SIGPIPE_R->drain
		1595	: sysread $SIGPIPE_R, (my $dummy), 9;
1323		1596
1324	$SIG{$signal} \|\|= sub {	1597	while (%SIG_EV) {
1325	local $!;	1598	for (keys %SIG_EV) {
1326	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1599	delete $SIG_EV{$_};
1327	undef $SIG_EV{$signal};	1600	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1601	}
		1602	}
1328	};	1603	};
1329
1330	# can't do signal processing without introducing races in pure perl,
1331	# so limit the signal latency.
1332	_sig_add;
1333	}	1604	};
		1605	die if $@;
1334		1606
1335	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1336	}
1337
1338	sub signal {
1339	# probe for availability of Async::Interrupt
1340	if (!$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;
1342
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 $VERBOSE >= 8;
1349
1350	require Fcntl;
1351
1352	if (AnyEvent::WIN32) {
1353	require AnyEvent::Util;
1354
1355	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1356	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1357	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1358	} else {
1359	pipe $SIGPIPE_R, $SIGPIPE_W;
1360	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
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;
1366	}
1367
1368	$SIGPIPE_R
1369	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1370
1371	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1372	}
1373
1374	*signal = \&_signal;
1375	&signal	1607	&signal
1376	}
1377
1378	sub AnyEvent::Base::signal::DESTROY {
1379	my ($signal, $cb) = @{$_[0]};
1380
1381	_sig_del;
1382
1383	delete $SIG_CB{$signal}{$cb};
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}
1391	unless keys %{ $SIG_CB{$signal} };
1392	}	1608	}
1393		1609
1394	# default implementation for ->child	1610	# default implementation for ->child
1395		1611
1396	our %PID_CB;	1612	our %PID_CB;
1397	our $CHLD_W;	1613	our $CHLD_W;
1398	our $CHLD_DELAY_W;	1614	our $CHLD_DELAY_W;
1399	our $WNOHANG;	1615	our $WNOHANG;
1400		1616
1401	sub _sigchld {	1617	# used by many Impl's
1402	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1618	sub _emit_childstatus($$) {
1403	$_->($pid, $?)	1619	my (undef, $rpid, $rstatus) = @_;
		1620
		1621	$_->($rpid, $rstatus)
1404	for values %{ $PID_CB{$pid} \|\| {} },	1622	for values %{ $PID_CB{$rpid} \|\| {} },
1405	values %{ $PID_CB{0} \|\| {} };	1623	values %{ $PID_CB{0} \|\| {} };
1406	}
1407	}	1624	}
1408		1625
1409	sub child {	1626	sub child {
		1627	eval q{ # poor man's autoloading {}
		1628	*_sigchld = sub {
		1629	my $pid;
		1630
		1631	AnyEvent->_emit_childstatus ($pid, $?)
		1632	while ($pid = waitpid -1, $WNOHANG) > 0;
		1633	};
		1634
		1635	*child = sub {
1410	my (undef, %arg) = @_;	1636	my (undef, %arg) = @_;
1411		1637
1412	defined (my $pid = $arg{pid} + 0)	1638	defined (my $pid = $arg{pid} + 0)
1413	or Carp::croak "required option 'pid' is missing";	1639	or Carp::croak "required option 'pid' is missing";
1414		1640
1415	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1641	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1416		1642
1417	# WNOHANG is almost cetrainly 1 everywhere	1643	# WNOHANG is almost cetrainly 1 everywhere
1418	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1644	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1419	? 1	1645	? 1
1420	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1646	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1421		1647
1422	unless ($CHLD_W) {	1648	unless ($CHLD_W) {
1423	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1649	$CHLD_W = AE::signal CHLD => \&_sigchld;
1424	# child could be a zombie already, so make at least one round	1650	# child could be a zombie already, so make at least one round
1425	&_sigchld;	1651	&_sigchld;
1426	}	1652	}
1427		1653
1428	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1654	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1429	}	1655	};
1430		1656
1431	sub AnyEvent::Base::child::DESTROY {	1657	*AnyEvent::Base::child::DESTROY = sub {
1432	my ($pid, $cb) = @{$_[0]};	1658	my ($pid, $cb) = @{$_[0]};
1433		1659
1434	delete $PID_CB{$pid}{$cb};	1660	delete $PID_CB{$pid}{$cb};
1435	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1661	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1436		1662
1437	undef $CHLD_W unless keys %PID_CB;	1663	undef $CHLD_W unless keys %PID_CB;
		1664	};
		1665	};
		1666	die if $@;
		1667
		1668	&child
1438	}	1669	}
1439		1670
1440	# idle emulation is done by simply using a timer, regardless	1671	# idle emulation is done by simply using a timer, regardless
1441	# of whether the process is idle or not, and not letting	1672	# of whether the process is idle or not, and not letting
1442	# the callback use more than 50% of the time.	1673	# the callback use more than 50% of the time.
1443	sub idle {	1674	sub idle {
		1675	eval q{ # poor man's autoloading {}
		1676	*idle = sub {
1444	my (undef, %arg) = @_;	1677	my (undef, %arg) = @_;
1445		1678
1446	my ($cb, $w, $rcb) = $arg{cb};	1679	my ($cb, $w, $rcb) = $arg{cb};
1447		1680
1448	$rcb = sub {	1681	$rcb = sub {
1449	if ($cb) {	1682	if ($cb) {
1450	$w = _time;	1683	$w = _time;
1451	&$cb;	1684	&$cb;
1452	$w = _time - $w;	1685	$w = _time - $w;
1453		1686
1454	# never use more then 50% of the time for the idle watcher,	1687	# never use more then 50% of the time for the idle watcher,
1455	# within some limits	1688	# within some limits
1456	$w = 0.0001 if $w < 0.0001;	1689	$w = 0.0001 if $w < 0.0001;
1457	$w = 5 if $w > 5;	1690	$w = 5 if $w > 5;
1458		1691
1459	$w = AnyEvent->timer (after => $w, cb => $rcb);	1692	$w = AE::timer $w, 0, $rcb;
1460	} else {	1693	} else {
1461	# clean up...	1694	# clean up...
1462	undef $w;	1695	undef $w;
1463	undef $rcb;	1696	undef $rcb;
		1697	}
		1698	};
		1699
		1700	$w = AE::timer 0.05, 0, $rcb;
		1701
		1702	bless \\$cb, "AnyEvent::Base::idle"
1464	}	1703	};
		1704
		1705	*AnyEvent::Base::idle::DESTROY = sub {
		1706	undef $${$_[0]};
		1707	};
1465	};	1708	};
		1709	die if $@;
1466		1710
1467	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1711	&idle
1468
1469	bless \\$cb, "AnyEvent::Base::idle"
1470	}
1471
1472	sub AnyEvent::Base::idle::DESTROY {
1473	undef $${$_[0]};
1474	}	1712	}
1475		1713
1476	package AnyEvent::CondVar;	1714	package AnyEvent::CondVar;
1477		1715
1478	our @ISA = AnyEvent::CondVar::Base::;	1716	our @ISA = AnyEvent::CondVar::Base::;
…		…
1526	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1764	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1527	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1765	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1528	}	1766	}
1529		1767
1530	sub cb {	1768	sub cb {
1531	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1769	my $cv = shift;
		1770
		1771	@_
		1772	and $cv->{_ae_cb} = shift
		1773	and $cv->{_ae_sent}
		1774	and (delete $cv->{_ae_cb})->($cv);
		1775
1532	$_[0]{_ae_cb}	1776	$cv->{_ae_cb}
1533	}	1777	}
1534		1778
1535	sub begin {	1779	sub begin {
1536	++$_[0]{_ae_counter};	1780	++$_[0]{_ae_counter};
1537	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1781	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1746	warn "read: $input\n"; # output what has been read	1990	warn "read: $input\n"; # output what has been read
1747	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1991	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1748	},	1992	},
1749	);	1993	);
1750		1994
1751	my $time_watcher; # can only be used once
1752
1753	sub new_timer {
1754	$timer = AnyEvent->timer (after => 1, cb => sub {	1995	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1755	warn "timeout\n"; # print 'timeout' about every second	1996	warn "timeout\n"; # print 'timeout' at most every second
1756	&new_timer; # and restart the time
1757	});	1997	});
1758	}
1759
1760	new_timer; # create first timer
1761		1998
1762	$cv->recv; # wait until user enters /^q/i	1999	$cv->recv; # wait until user enters /^q/i
1763		2000
1764	=head1 REAL-WORLD EXAMPLE	2001	=head1 REAL-WORLD EXAMPLE
1765		2002
…		…
1896	through AnyEvent. The benchmark creates a lot of timers (with a zero	2133	through AnyEvent. The benchmark creates a lot of timers (with a zero
1897	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2134	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
1898	which it is), lets them fire exactly once and destroys them again.	2135	which it is), lets them fire exactly once and destroys them again.
1899		2136
1900	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2137	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1901	distribution.	2138	distribution. It uses the L<AE> interface, which makes a real difference
		2139	for the EV and Perl backends only.
1902		2140
1903	=head3 Explanation of the columns	2141	=head3 Explanation of the columns
1904		2142
1905	I<watcher> is the number of event watchers created/destroyed. Since	2143	I<watcher> is the number of event watchers created/destroyed. Since
1906	different event models feature vastly different performances, each event	2144	different event models feature vastly different performances, each event
…		…
1927	watcher.	2165	watcher.
1928		2166
1929	=head3 Results	2167	=head3 Results
1930		2168
1931	name watchers bytes create invoke destroy comment	2169	name watchers bytes create invoke destroy comment
1932	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2170	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
1933	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2171	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
1934	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2172	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
1935	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2173	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
1936	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2174	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
1937	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2175	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
1938	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2176	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
1939	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2177	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
1940	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2178	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
1941	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2179	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
1942	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2180	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
1943	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2181	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
1944		2182
1945	=head3 Discussion	2183	=head3 Discussion
1946		2184
1947	The benchmark does I<not> measure scalability of the event loop very	2185	The benchmark does I<not> measure scalability of the event loop very
1948	well. For example, a select-based event loop (such as the pure perl one)	2186	well. For example, a select-based event loop (such as the pure perl one)
…		…
1960	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2198	benchmark machine, handling an event takes roughly 1600 CPU cycles with
1961	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2199	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
1962	cycles with POE.	2200	cycles with POE.
1963		2201
1964	C<EV> is the sole leader regarding speed and memory use, which are both	2202	C<EV> is the sole leader regarding speed and memory use, which are both
1965	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2203	maximal/minimal, respectively. When using the L<AE> API there is zero
		2204	overhead (when going through the AnyEvent API create is about 5-6 times
		2205	slower, with other times being equal, so still uses far less memory than
1966	far less memory than any other event loop and is still faster than Event	2206	any other event loop and is still faster than Event natively).
1967	natively.
1968		2207
1969	The pure perl implementation is hit in a few sweet spots (both the	2208	The pure perl implementation is hit in a few sweet spots (both the
1970	constant timeout and the use of a single fd hit optimisations in the perl	2209	constant timeout and the use of a single fd hit optimisations in the perl
1971	interpreter and the backend itself). Nevertheless this shows that it	2210	interpreter and the backend itself). Nevertheless this shows that it
1972	adds very little overhead in itself. Like any select-based backend its	2211	adds very little overhead in itself. Like any select-based backend its
…		…
2046	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2285	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2047	(1%) are active. This mirrors the activity of large servers with many	2286	(1%) are active. This mirrors the activity of large servers with many
2048	connections, most of which are idle at any one point in time.	2287	connections, most of which are idle at any one point in time.
2049		2288
2050	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2289	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2051	distribution.	2290	distribution. It uses the L<AE> interface, which makes a real difference
		2291	for the EV and Perl backends only.
2052		2292
2053	=head3 Explanation of the columns	2293	=head3 Explanation of the columns
2054		2294
2055	I<sockets> is the number of sockets, and twice the number of "servers" (as	2295	I<sockets> is the number of sockets, and twice the number of "servers" (as
2056	each server has a read and write socket end).	2296	each server has a read and write socket end).
…		…
2064	a new one that moves the timeout into the future.	2304	a new one that moves the timeout into the future.
2065		2305
2066	=head3 Results	2306	=head3 Results
2067		2307
2068	name sockets create request	2308	name sockets create request
2069	EV 20000 69.01 11.16	2309	EV 20000 62.66 7.99
2070	Perl 20000 73.32 35.87	2310	Perl 20000 68.32 32.64
2071	IOAsync 20000 157.00 98.14 epoll	2311	IOAsync 20000 174.06 101.15 epoll
2072	IOAsync 20000 159.31 616.06 poll	2312	IOAsync 20000 174.67 610.84 poll
2073	Event 20000 212.62 257.32	2313	Event 20000 202.69 242.91
2074	Glib 20000 651.16 1896.30	2314	Glib 20000 557.01 1689.52
2075	POE 20000 349.67 12317.24 uses POE::Loop::Event	2315	POE 20000 341.54 12086.32 uses POE::Loop::Event
2076		2316
2077	=head3 Discussion	2317	=head3 Discussion
2078		2318
2079	This benchmark I<does> measure scalability and overall performance of the	2319	This benchmark I<does> measure scalability and overall performance of the
2080	particular event loop.	2320	particular event loop.
…		…
2206	As you can see, the AnyEvent + EV combination even beats the	2446	As you can see, the AnyEvent + EV combination even beats the
2207	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2447	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2208	backend easily beats IO::Lambda and POE.	2448	backend easily beats IO::Lambda and POE.
2209		2449
2210	And even the 100% non-blocking version written using the high-level (and	2450	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	2451	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2212	large margin, even though it does all of DNS, tcp-connect and socket I/O	2452	higher level ("unoptimised") abstractions by a large margin, even though
2213	in a non-blocking way.	2453	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2214		2454
2215	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2455	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	2456	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.	2457	part of the IO::Lambda distribution and were used without any changes.
2218		2458
2219		2459
2220	=head1 SIGNALS	2460	=head1 SIGNALS
2221		2461
2222	AnyEvent currently installs handlers for these signals:	2462	AnyEvent currently installs handlers for these signals:
…		…
2264	it's built-in modules) are required to use it.	2504	it's built-in modules) are required to use it.
2265		2505
2266	That does not mean that AnyEvent won't take advantage of some additional	2506	That does not mean that AnyEvent won't take advantage of some additional
2267	modules if they are installed.	2507	modules if they are installed.
2268		2508
2269	This section epxlains which additional modules will be used, and how they	2509	This section explains which additional modules will be used, and how they
2270	affect AnyEvent's operetion.	2510	affect AnyEvent's operation.
2271		2511
2272	=over 4	2512	=over 4
2273		2513
2274	=item L<Async::Interrupt>	2514	=item L<Async::Interrupt>
2275		2515
…		…
2280	catch the signals) with some delay (default is 10 seconds, look for	2520	catch the signals) with some delay (default is 10 seconds, look for
2281	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2521	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2282		2522
2283	If this module is available, then it will be used to implement signal	2523	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	2524	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	2525	will not be interrupted regularly, which is more efficient (and good for
2286	battery life on laptops).	2526	battery life on laptops).
2287		2527
2288	This affects not just the pure-perl event loop, but also other event loops	2528	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).	2529	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2290		2530
…		…
2302	automatic timer adjustments even when no monotonic clock is available,	2542	automatic timer adjustments even when no monotonic clock is available,
2303	can take avdantage of advanced kernel interfaces such as C<epoll> and	2543	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	2544	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>).	2545	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
2306		2546
		2547	If you only use backends that rely on another event loop (e.g. C<Tk>),
		2548	then this module will do nothing for you.
		2549
2307	=item L<Guard>	2550	=item L<Guard>
2308		2551
2309	The guard module, when used, will be used to implement	2552	The guard module, when used, will be used to implement
2310	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a	2553	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	2554	lot less memory), but otherwise doesn't affect guard operation much. It is
2312	purely used for performance.	2555	purely used for performance.
2313		2556
2314	=item L<JSON> and L<JSON::XS>	2557	=item L<JSON> and L<JSON::XS>
2315		2558
2316	This module is required when you want to read or write JSON data via	2559	One of these modules is required when you want to read or write JSON data
2317	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2560	via L<AnyEvent::Handle>. L<JSON> is also written in pure-perl, but can take
2318	advantage of the ulta-high-speed L<JSON::XS> module when it is installed.	2561	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		2562
2323	=item L<Net::SSLeay>	2563	=item L<Net::SSLeay>
2324		2564
2325	Implementing TLS/SSL in Perl is certainly interesting, but not very	2565	Implementing TLS/SSL in Perl is certainly interesting, but not very
2326	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with	2566	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
…		…
2337		2577
2338		2578
2339	=head1 FORK	2579	=head1 FORK
2340		2580
2341	Most event libraries are not fork-safe. The ones who are usually are	2581	Most event libraries are not fork-safe. The ones who are usually are
2342	because they rely on inefficient but fork-safe C<select> or C<poll>	2582	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2343	calls. Only L<EV> is fully fork-aware.	2583	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2584	are usually badly thought-out hacks that are incompatible with fork in
		2585	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2586	continue event-processing in both parent and child (or both, if you know
		2587	what you are doing).
		2588
		2589	This means that, in general, you cannot fork and do event processing in
		2590	the child if the event library was initialised before the fork (which
		2591	usually happens when the first AnyEvent watcher is created, or the library
		2592	is loaded).
2344		2593
2345	If you have to fork, you must either do so I<before> creating your first	2594	If you have to fork, you must either do so I<before> creating your first
2346	watcher OR you must not use AnyEvent at all in the child OR you must do	2595	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.	2596	something completely out of the scope of AnyEvent.
		2597
		2598	The problem of doing event processing in the parent I<and> the child
		2599	is much more complicated: even for backends that I<are> fork-aware or
		2600	fork-safe, their behaviour is not usually what you want: fork clones all
		2601	watchers, that means all timers, I/O watchers etc. are active in both
		2602	parent and child, which is almost never what you want. USing C<exec>
		2603	to start worker children from some kind of manage rprocess is usually
		2604	preferred, because it is much easier and cleaner, at the expense of having
		2605	to have another binary.
2348		2606
2349		2607
2350	=head1 SECURITY CONSIDERATIONS	2608	=head1 SECURITY CONSIDERATIONS
2351		2609
2352	AnyEvent can be forced to load any event model via	2610	AnyEvent can be forced to load any event model via
…		…
2390	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2648	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2391		2649
2392	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2650	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2393	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2651	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2394	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2652	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2395	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.	2653	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.
2396		2654
2397	Non-blocking file handles, sockets, TCP clients and	2655	Non-blocking file handles, sockets, TCP clients and
2398	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	2656	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2399		2657
2400	Asynchronous DNS: L<AnyEvent::DNS>.	2658	Asynchronous DNS: L<AnyEvent::DNS>.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.247 by root, Sat Jul 18 22:24:17 2009 UTC vs. Revision 1.317 by root, Wed Mar 24 21:22:57 2010 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.247 by root, Sat Jul 18 22:24:17 2009 UTC vs.
Revision 1.317 by root, Wed Mar 24 21:22:57 2010 UTC