[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 1.320 by root, Mon Apr 12 02:50:31 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 L<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
…		…
550	eventually calls C<< -> send >>, and the "consumer side", which waits	609	eventually calls C<< -> send >>, and the "consumer side", which waits
551	for the send to occur.	610	for the send to occur.
552		611
553	Example: wait for a timer.	612	Example: wait for a timer.
554		613
555	# wait till the result is ready	614	# condition: "wait till the timer is fired"
556	my $result_ready = AnyEvent->condvar;	615	my $timer_fired = AnyEvent->condvar;
557		616
558	# do something such as adding a timer	617	# create the timer - we could wait for, say
559	# or socket watcher the calls $result_ready->send	618	# a handle becomign ready, or even an
560	# when the "result" is ready.	619	# AnyEvent::HTTP request to finish, but
561	# in this case, we simply use a timer:	620	# in this case, we simply use a timer:
562	my $w = AnyEvent->timer (	621	my $w = AnyEvent->timer (
563	after => 1,	622	after => 1,
564	cb => sub { $result_ready->send },	623	cb => sub { $timer_fired->send },
565	);	624	);
566		625
567	# this "blocks" (while handling events) till the callback	626	# this "blocks" (while handling events) till the callback
568	# calls -<send	627	# calls ->send
569	$result_ready->recv;	628	$timer_fired->recv;
570		629
571	Example: wait for a timer, but take advantage of the fact that condition	630	Example: wait for a timer, but take advantage of the fact that condition
572	variables are also callable directly.	631	variables are also callable directly.
573		632
574	my $done = AnyEvent->condvar;	633	my $done = AnyEvent->condvar;
…		…
637	one. For example, a function that pings many hosts in parallel might want	696	one. For example, a function that pings many hosts in parallel might want
638	to use a condition variable for the whole process.	697	to use a condition variable for the whole process.
639		698
640	Every call to C<< ->begin >> will increment a counter, and every call to	699	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	700	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	701	>>, 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	702	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.	703	>>, but that is not required. If no group callback was set, C<send> will
		704	be called without any arguments.
645		705
646	You can think of C<< $cv->send >> giving you an OR condition (one call	706	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	707	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).	708	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
649		709
…		…
676	begung can potentially be zero:	736	begung can potentially be zero:
677		737
678	my $cv = AnyEvent->condvar;	738	my $cv = AnyEvent->condvar;
679		739
680	my %result;	740	my %result;
681	$cv->begin (sub { $cv->send (\%result) });	741	$cv->begin (sub { shift->send (\%result) });
682		742
683	for my $host (@list_of_hosts) {	743	for my $host (@list_of_hosts) {
684	$cv->begin;	744	$cv->begin;
685	ping_host_then_call_callback $host, sub {	745	ping_host_then_call_callback $host, sub {
686	$result{$host} = ...;	746	$result{$host} = ...;
…		…
761	=item $cb = $cv->cb ($cb->($cv))	821	=item $cb = $cv->cb ($cb->($cv))
762		822
763	This is a mutator function that returns the callback set and optionally	823	This is a mutator function that returns the callback set and optionally
764	replaces it before doing so.	824	replaces it before doing so.
765		825
766	The callback will be called when the condition becomes "true", i.e. when	826	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	827	"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	828	the only argument being the condition variable itself. Calling C<recv>
769	is guaranteed not to block.	829	inside the callback or at any later time is guaranteed not to block.
770		830
771	=back	831	=back
772		832
773	=head1 SUPPORTED EVENT LOOPS/BACKENDS	833	=head1 SUPPORTED EVENT LOOPS/BACKENDS
774		834
…		…
777	=over 4	837	=over 4
778		838
779	=item Backends that are autoprobed when no other event loop can be found.	839	=item Backends that are autoprobed when no other event loop can be found.
780		840
781	EV is the preferred backend when no other event loop seems to be in	841	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	842	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	843	pure-perl implementation, which is available everywhere as it comes with
784	available everywhere as it comes with AnyEvent itself.	844	AnyEvent itself.
785		845
786	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	846	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.	847	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
789		848
790	=item Backends that are transparently being picked up when they are used.	849	=item Backends that are transparently being picked up when they are used.
791		850
792	These will be used when they are currently loaded when the first watcher	851	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	852	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	853	them. This means that AnyEvent will automatically pick the right backend
795	when the main program loads an event module before anything starts to	854	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.	855	create watchers. Nothing special needs to be done by the main program.
797		856
		857	AnyEvent::Impl::Event based on Event, very stable, few glitches.
798	AnyEvent::Impl::Glib based on Glib, slow but very stable.	858	AnyEvent::Impl::Glib based on Glib, slow but very stable.
799	AnyEvent::Impl::Tk based on Tk, very broken.	859	AnyEvent::Impl::Tk based on Tk, very broken.
800	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	860	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
801	AnyEvent::Impl::POE based on POE, very slow, some limitations.	861	AnyEvent::Impl::POE based on POE, very slow, some limitations.
802	AnyEvent::Impl::Irssi used when running within irssi.	862	AnyEvent::Impl::Irssi used when running within irssi.
…		…
912	You should check C<$AnyEvent::MODEL> before adding to this array, though:	972	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	973	if it is defined then the event loop has already been detected, and the
914	array will be ignored.	974	array will be ignored.
915		975
916	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	976	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
917	it,as it takes care of these details.	977	it, as it takes care of these details.
918		978
919	This variable is mainly useful for modules that can do something useful	979	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	980	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	981	not need to even load it by default. This array provides the means to hook
922	into AnyEvent passively, without loading it.	982	into AnyEvent passively, without loading it.
		983
		984	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		985	together, you could put this into Coro (this is the actual code used by
		986	Coro to accomplish this):
		987
		988	if (defined $AnyEvent::MODEL) {
		989	# AnyEvent already initialised, so load Coro::AnyEvent
		990	require Coro::AnyEvent;
		991	} else {
		992	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		993	# as soon as it is
		994	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		995	}
923		996
924	=back	997	=back
925		998
926	=head1 WHAT TO DO IN A MODULE	999	=head1 WHAT TO DO IN A MODULE
927		1000
…		…
1076		1149
1077	package AnyEvent;	1150	package AnyEvent;
1078		1151
1079	# basically a tuned-down version of common::sense	1152	# basically a tuned-down version of common::sense
1080	sub common_sense {	1153	sub common_sense {
1081	# no warnings	1154	# from common:.sense 1.0
1082	${^WARNING_BITS} ^= ${^WARNING_BITS};	1155	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1083	# use strict vars subs	1156	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1084	$^H \|= 0x00000600;	1157	$^H \|= 0x00000600;
1085	}	1158	}
1086		1159
1087	BEGIN { AnyEvent::common_sense }	1160	BEGIN { AnyEvent::common_sense }
1088		1161
1089	use Carp ();	1162	use Carp ();
1090		1163
1091	our $VERSION = 4.881;	1164	our $VERSION = '5.26';
1092	our $MODEL;	1165	our $MODEL;
1093		1166
1094	our $AUTOLOAD;	1167	our $AUTOLOAD;
1095	our @ISA;	1168	our @ISA;
1096		1169
1097	our @REGISTRY;	1170	our @REGISTRY;
1098		1171
1099	our $WIN32;
1100
1101	our $VERBOSE;	1172	our $VERBOSE;
1102		1173
1103	BEGIN {	1174	BEGIN {
1104	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1175	require "AnyEvent/constants.pl";
		1176
1105	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1177	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1106		1178
1107	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1179	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1108	if ${^TAINT};	1180	if ${^TAINT};
1109		1181
1110	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1182	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1122	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1194	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1123	}	1195	}
1124		1196
1125	my @models = (	1197	my @models = (
1126	[EV:: => AnyEvent::Impl::EV:: , 1],	1198	[EV:: => AnyEvent::Impl::EV:: , 1],
1127	[Event:: => AnyEvent::Impl::Event::, 1],
1128	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1199	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1129	# everything below here will not (normally) be autoprobed	1200	# everything below here will not (normally) be autoprobed
1130	# as the pureperl backend should work everywhere	1201	# as the pureperl backend should work everywhere
1131	# and is usually faster	1202	# and is usually faster
		1203	[Event:: => AnyEvent::Impl::Event::, 1],
1132	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1204	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1133	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1205	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1134	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1206	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1135	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1207	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1136	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1208	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
…		…
1139	[Prima:: => AnyEvent::Impl::POE::],	1211	[Prima:: => AnyEvent::Impl::POE::],
1140	# IO::Async is just too broken - we would need workarounds for its	1212	# IO::Async is just too broken - we would need workarounds for its
1141	# byzantine signal and broken child handling, among others.	1213	# byzantine signal and broken child handling, among others.
1142	# IO::Async is rather hard to detect, as it doesn't have any	1214	# IO::Async is rather hard to detect, as it doesn't have any
1143	# obvious default class.	1215	# obvious default class.
1144	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1216	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1145	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1217	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1146	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1218	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1219	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1147	);	1220	);
1148		1221
1149	our %method = map +($_ => 1),	1222	our %method = map +($_ => 1),
1150	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1223	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1151		1224
1152	our @post_detect;	1225	our @post_detect;
1153		1226
1154	sub post_detect(&) {	1227	sub post_detect(&) {
1155	my ($cb) = @_;	1228	my ($cb) = @_;
1156		1229
1157	if ($MODEL) {
1158	$cb->();
1159
1160	undef
1161	} else {
1162	push @post_detect, $cb;	1230	push @post_detect, $cb;
1163		1231
1164	defined wantarray	1232	defined wantarray
1165	? bless \$cb, "AnyEvent::Util::postdetect"	1233	? bless \$cb, "AnyEvent::Util::postdetect"
1166	: ()	1234	: ()
1167	}
1168	}	1235	}
1169		1236
1170	sub AnyEvent::Util::postdetect::DESTROY {	1237	sub AnyEvent::Util::postdetect::DESTROY {
1171	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1238	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1172	}	1239	}
1173		1240
1174	sub detect() {	1241	sub detect() {
		1242	# free some memory
		1243	*detect = sub () { $MODEL };
		1244
		1245	local $!; # for good measure
		1246	local $SIG{__DIE__};
		1247
		1248	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1249	my $model = "AnyEvent::Impl::$1";
		1250	if (eval "require $model") {
		1251	$MODEL = $model;
		1252	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1253	} else {
		1254	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1255	}
		1256	}
		1257
		1258	# check for already loaded models
1175	unless ($MODEL) {	1259	unless ($MODEL) {
1176	local $SIG{__DIE__};	1260	for (@REGISTRY, @models) {
1177		1261	my ($package, $model) = @$_;
1178	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1262	if (${"$package\::VERSION"} > 0) {
1179	my $model = "AnyEvent::Impl::$1";
1180	if (eval "require $model") {	1263	if (eval "require $model") {
1181	$MODEL = $model;	1264	$MODEL = $model;
1182	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1265	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1183	} else {	1266	last;
1184	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1267	}
1185	}	1268	}
1186	}	1269	}
1187		1270
1188	# check for already loaded models
1189	unless ($MODEL) {	1271	unless ($MODEL) {
		1272	# try to autoload a model
1190	for (@REGISTRY, @models) {	1273	for (@REGISTRY, @models) {
1191	my ($package, $model) = @$_;	1274	my ($package, $model, $autoload) = @$_;
		1275	if (
		1276	$autoload
		1277	and eval "require $package"
1192	if (${"$package\::VERSION"} > 0) {	1278	and ${"$package\::VERSION"} > 0
1193	if (eval "require $model") {	1279	and eval "require $model"
		1280	) {
1194	$MODEL = $model;	1281	$MODEL = $model;
1195	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1282	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1196	last;	1283	last;
1197	}
1198	}	1284	}
1199	}	1285	}
1200		1286
1201	unless ($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	1287	$MODEL
1218	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1288	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1219	}
1220	}	1289	}
1221
1222	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1223
1224	unshift @ISA, $MODEL;
1225
1226	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1227
1228	(shift @post_detect)->() while @post_detect;
1229	}	1290	}
		1291
		1292	@models = (); # free probe data
		1293
		1294	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1295	unshift @ISA, $MODEL;
		1296
		1297	# now nuke some methods that are overriden by the backend.
		1298	# SUPER is not allowed.
		1299	for (qw(time signal child idle)) {
		1300	undef &{"AnyEvent::Base::$_"}
		1301	if defined &{"$MODEL\::$_"};
		1302	}
		1303
		1304	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1305
		1306	(shift @post_detect)->() while @post_detect;
		1307
		1308	*post_detect = sub(&) {
		1309	shift->();
		1310
		1311	undef
		1312	};
1230		1313
1231	$MODEL	1314	$MODEL
1232	}	1315	}
1233		1316
1234	sub AUTOLOAD {	1317	sub AUTOLOAD {
1235	(my $func = $AUTOLOAD) =~ s/.*://;	1318	(my $func = $AUTOLOAD) =~ s/.*://;
1236		1319
1237	$method{$func}	1320	$method{$func}
1238	or Carp::croak "$func: not a valid method for AnyEvent objects";	1321	or Carp::croak "$func: not a valid AnyEvent class method";
1239		1322
1240	detect unless $MODEL;	1323	detect;
1241		1324
1242	my $class = shift;	1325	my $class = shift;
1243	$class->$func (@_);	1326	$class->$func (@_);
1244	}	1327	}
1245		1328
…		…
1258	# we assume CLOEXEC is already set by perl in all important cases	1341	# we assume CLOEXEC is already set by perl in all important cases
1259		1342
1260	($fh2, $rw)	1343	($fh2, $rw)
1261	}	1344	}
1262		1345
		1346	=head1 SIMPLIFIED AE API
		1347
		1348	Starting with version 5.0, AnyEvent officially supports a second, much
		1349	simpler, API that is designed to reduce the calling, typing and memory
		1350	overhead by using function call syntax and a fixed number of parameters.
		1351
		1352	See the L<AE> manpage for details.
		1353
		1354	=cut
		1355
		1356	package AE;
		1357
		1358	our $VERSION = $AnyEvent::VERSION;
		1359
		1360	# fall back to the main API by default - backends and AnyEvent::Base
		1361	# implementations can overwrite these.
		1362
		1363	sub io($$$) {
		1364	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1365	}
		1366
		1367	sub timer($$$) {
		1368	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1369	}
		1370
		1371	sub signal($$) {
		1372	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1373	}
		1374
		1375	sub child($$) {
		1376	AnyEvent->child (pid => $_[0], cb => $_[1])
		1377	}
		1378
		1379	sub idle($) {
		1380	AnyEvent->idle (cb => $_[0])
		1381	}
		1382
		1383	sub cv(;&) {
		1384	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1385	}
		1386
		1387	sub now() {
		1388	AnyEvent->now
		1389	}
		1390
		1391	sub now_update() {
		1392	AnyEvent->now_update
		1393	}
		1394
		1395	sub time() {
		1396	AnyEvent->time
		1397	}
		1398
1263	package AnyEvent::Base;	1399	package AnyEvent::Base;
1264		1400
1265	# default implementations for many methods	1401	# default implementations for many methods
1266		1402
1267	sub _time {	1403	sub time {
		1404	eval q{ # poor man's autoloading {}
1268	# probe for availability of Time::HiRes	1405	# probe for availability of Time::HiRes
1269	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1406	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1270	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1407	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1271	*_time = \&Time::HiRes::time;	1408	*AE::time = \&Time::HiRes::time;
1272	# if (eval "use POSIX (); (POSIX::times())...	1409	# if (eval "use POSIX (); (POSIX::times())...
1273	} else {	1410	} else {
1274	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1411	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1275	*_time = sub { time }; # epic fail	1412	*AE::time = sub (){ time }; # epic fail
		1413	}
		1414
		1415	*time = sub { AE::time }; # different prototypes
1276	}	1416	};
		1417	die if $@;
1277		1418
1278	&_time	1419	&time
1279	}	1420	}
1280		1421
1281	sub time { _time }	1422	*now = \&time;
1282	sub now { _time }	1423
1283	sub now_update { }	1424	sub now_update { }
1284		1425
1285	# default implementation for ->condvar	1426	# default implementation for ->condvar
1286		1427
1287	sub condvar {	1428	sub condvar {
		1429	eval q{ # poor man's autoloading {}
		1430	*condvar = sub {
1288	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1431	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
		1432	};
		1433
		1434	*AE::cv = sub (;&) {
		1435	bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar"
		1436	};
		1437	};
		1438	die if $@;
		1439
		1440	&condvar
1289	}	1441	}
1290		1442
1291	# default implementation for ->signal	1443	# default implementation for ->signal
1292		1444
1293	our $HAVE_ASYNC_INTERRUPT;	1445	our $HAVE_ASYNC_INTERRUPT;
1294		1446
1295	sub _have_async_interrupt() {	1447	sub _have_async_interrupt() {
1296	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1448	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1297	&& eval "use Async::Interrupt 1.0 (); 1")	1449	&& eval "use Async::Interrupt 1.02 (); 1")
1298	unless defined $HAVE_ASYNC_INTERRUPT;	1450	unless defined $HAVE_ASYNC_INTERRUPT;
1299		1451
1300	$HAVE_ASYNC_INTERRUPT	1452	$HAVE_ASYNC_INTERRUPT
1301	}	1453	}
1302		1454
1303	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1455	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1304	our (%SIG_ASY, %SIG_ASY_W);	1456	our (%SIG_ASY, %SIG_ASY_W);
1305	our ($SIG_COUNT, $SIG_TW);	1457	our ($SIG_COUNT, $SIG_TW);
1306		1458
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	1459	# install a dummy wakeup watcher to reduce signal catching latency
		1460	# used by Impls
1321	sub _sig_add() {	1461	sub _sig_add() {
1322	unless ($SIG_COUNT++) {	1462	unless ($SIG_COUNT++) {
1323	# try to align timer on a full-second boundary, if possible	1463	# try to align timer on a full-second boundary, if possible
1324	my $NOW = AnyEvent->now;	1464	my $NOW = AE::now;
1325		1465
1326	$SIG_TW = AnyEvent->timer (	1466	$SIG_TW = AE::timer
1327	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1467	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1328	interval => $MAX_SIGNAL_LATENCY,	1468	$MAX_SIGNAL_LATENCY,
1329	cb => sub { }, # just for the PERL_ASYNC_CHECK	1469	sub { } # just for the PERL_ASYNC_CHECK
1330	);	1470	;
1331	}	1471	}
1332	}	1472	}
1333		1473
1334	sub _sig_del {	1474	sub _sig_del {
1335	undef $SIG_TW	1475	undef $SIG_TW
1336	unless --$SIG_COUNT;	1476	unless --$SIG_COUNT;
1337	}	1477	}
1338		1478
1339	our $_sig_name_init; $_sig_name_init = sub {	1479	our $_sig_name_init; $_sig_name_init = sub {
		1480	eval q{ # poor man's autoloading {}
1340	undef $_sig_name_init;	1481	undef $_sig_name_init;
1341		1482
1342	if (_have_async_interrupt) {	1483	if (_have_async_interrupt) {
1343	*sig2num = \&Async::Interrupt::sig2num;	1484	*sig2num = \&Async::Interrupt::sig2num;
1344	*sig2name = \&Async::Interrupt::sig2name;	1485	*sig2name = \&Async::Interrupt::sig2name;
1345	} else {	1486	} else {
1346	require Config;	1487	require Config;
1347		1488
1348	my %signame2num;	1489	my %signame2num;
1349	@signame2num{ split ' ', $Config::Config{sig_name} }	1490	@signame2num{ split ' ', $Config::Config{sig_name} }
1350	= split ' ', $Config::Config{sig_num};	1491	= split ' ', $Config::Config{sig_num};
1351		1492
1352	my @signum2name;	1493	my @signum2name;
1353	@signum2name[values %signame2num] = keys %signame2num;	1494	@signum2name[values %signame2num] = keys %signame2num;
1354		1495
1355	*sig2num = sub($) {	1496	*sig2num = sub($) {
1356	$_[0] > 0 ? shift : $signame2num{+shift}	1497	$_[0] > 0 ? shift : $signame2num{+shift}
1357	};	1498	};
1358	*sig2name = sub ($) {	1499	*sig2name = sub ($) {
1359	$_[0] > 0 ? $signum2name[+shift] : shift	1500	$_[0] > 0 ? $signum2name[+shift] : shift
		1501	};
1360	};	1502	}
1361	}	1503	};
		1504	die if $@;
1362	};	1505	};
1363		1506
1364	sub sig2num ($) { &$_sig_name_init; &sig2num }	1507	sub sig2num ($) { &$_sig_name_init; &sig2num }
1365	sub sig2name($) { &$_sig_name_init; &sig2name }	1508	sub sig2name($) { &$_sig_name_init; &sig2name }
1366		1509
1367	sub _signal {	1510	sub signal {
		1511	eval q{ # poor man's autoloading {}
		1512	# probe for availability of Async::Interrupt
		1513	if (_have_async_interrupt) {
		1514	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
		1515
		1516	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1517	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
		1518
		1519	} else {
		1520	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1521
		1522	if (AnyEvent::WIN32) {
		1523	require AnyEvent::Util;
		1524
		1525	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1526	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1527	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1528	} else {
		1529	pipe $SIGPIPE_R, $SIGPIPE_W;
		1530	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
		1531	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
		1532
		1533	# not strictly required, as $^F is normally 2, but let's make sure...
		1534	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1535	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1536	}
		1537
		1538	$SIGPIPE_R
		1539	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1540
		1541	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1542	}
		1543
		1544	*signal = $HAVE_ASYNC_INTERRUPT
		1545	? sub {
1368	my (undef, %arg) = @_;	1546	my (undef, %arg) = @_;
1369		1547
1370	my $signal = uc $arg{signal}
1371	or Carp::croak "required option 'signal' is missing";
1372
1373	if ($HAVE_ASYNC_INTERRUPT) {
1374	# async::interrupt	1548	# async::interrupt
1375
1376	$signal = sig2num $signal;	1549	my $signal = sig2num $arg{signal};
1377	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1550	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1378		1551
1379	$SIG_ASY{$signal} \|\|= new Async::Interrupt	1552	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1380	cb => sub { undef $SIG_EV{$signal} },	1553	cb => sub { undef $SIG_EV{$signal} },
1381	signal => $signal,	1554	signal => $signal,
1382	pipe => [$SIGPIPE_R->filenos],	1555	pipe => [$SIGPIPE_R->filenos],
1383	pipe_autodrain => 0,	1556	pipe_autodrain => 0,
		1557	;
		1558
		1559	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1560	}
		1561	: sub {
		1562	my (undef, %arg) = @_;
		1563
		1564	# pure perl
		1565	my $signal = sig2name $arg{signal};
		1566	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1567
		1568	$SIG{$signal} \|\|= sub {
		1569	local $!;
		1570	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1571	undef $SIG_EV{$signal};
		1572	};
		1573
		1574	# can't do signal processing without introducing races in pure perl,
		1575	# so limit the signal latency.
		1576	_sig_add;
		1577
		1578	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1579	}
1384	;	1580	;
1385		1581
1386	} else {	1582	*AnyEvent::Base::signal::DESTROY = sub {
1387	# pure perl	1583	my ($signal, $cb) = @{$_[0]};
1388		1584
1389	# AE::Util has been loaded in signal	1585	_sig_del;
1390	$signal = sig2name $signal;
1391	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1392		1586
1393	$SIG{$signal} \|\|= sub {	1587	delete $SIG_CB{$signal}{$cb};
1394	local $!;	1588
1395	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1589	$HAVE_ASYNC_INTERRUPT
		1590	? delete $SIG_ASY{$signal}
		1591	: # delete doesn't work with older perls - they then
		1592	# print weird messages, or just unconditionally exit
		1593	# instead of getting the default action.
1396	undef $SIG_EV{$signal};	1594	undef $SIG{$signal}
		1595	unless keys %{ $SIG_CB{$signal} };
1397	};	1596	};
1398		1597
1399	# can't do signal processing without introducing races in pure perl,	1598	*_signal_exec = sub {
1400	# so limit the signal latency.	1599	$HAVE_ASYNC_INTERRUPT
1401	_sig_add;	1600	? $SIGPIPE_R->drain
1402	}	1601	: sysread $SIGPIPE_R, (my $dummy), 9;
1403		1602
1404	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"	1603	while (%SIG_EV) {
1405	}	1604	for (keys %SIG_EV) {
1406		1605	delete $SIG_EV{$_};
1407	sub signal {	1606	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1408	# probe for availability of Async::Interrupt	1607	}
1409	if (_have_async_interrupt) {	1608	}
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	}	1609	};
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	}	1610	};
		1611	die if $@;
1441		1612
1442	*signal = \&_signal;
1443	&signal	1613	&signal
1444	}
1445
1446	sub AnyEvent::Base::signal::DESTROY {
1447	my ($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	}	1614	}
1461		1615
1462	# default implementation for ->child	1616	# default implementation for ->child
1463		1617
1464	our %PID_CB;	1618	our %PID_CB;
1465	our $CHLD_W;	1619	our $CHLD_W;
1466	our $CHLD_DELAY_W;	1620	our $CHLD_DELAY_W;
1467	our $WNOHANG;	1621	our $WNOHANG;
1468		1622
		1623	# used by many Impl's
1469	sub _emit_childstatus($$) {	1624	sub _emit_childstatus($$) {
1470	my (undef, $rpid, $rstatus) = @_;	1625	my (undef, $rpid, $rstatus) = @_;
1471		1626
1472	$_->($rpid, $rstatus)	1627	$_->($rpid, $rstatus)
1473	for values %{ $PID_CB{$rpid} \|\| {} },	1628	for values %{ $PID_CB{$rpid} \|\| {} },
1474	values %{ $PID_CB{0} \|\| {} };	1629	values %{ $PID_CB{0} \|\| {} };
1475	}	1630	}
1476		1631
1477	sub _sigchld {
1478	my $pid;
1479
1480	AnyEvent->_emit_childstatus ($pid, $?)
1481	while ($pid = waitpid -1, $WNOHANG) > 0;
1482	}
1483
1484	sub child {	1632	sub child {
		1633	eval q{ # poor man's autoloading {}
		1634	*_sigchld = sub {
		1635	my $pid;
		1636
		1637	AnyEvent->_emit_childstatus ($pid, $?)
		1638	while ($pid = waitpid -1, $WNOHANG) > 0;
		1639	};
		1640
		1641	*child = sub {
1485	my (undef, %arg) = @_;	1642	my (undef, %arg) = @_;
1486		1643
1487	defined (my $pid = $arg{pid} + 0)	1644	defined (my $pid = $arg{pid} + 0)
1488	or Carp::croak "required option 'pid' is missing";	1645	or Carp::croak "required option 'pid' is missing";
1489		1646
1490	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1647	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1491		1648
1492	# WNOHANG is almost cetrainly 1 everywhere	1649	# WNOHANG is almost cetrainly 1 everywhere
1493	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1650	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1494	? 1	1651	? 1
1495	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1652	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1496		1653
1497	unless ($CHLD_W) {	1654	unless ($CHLD_W) {
1498	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1655	$CHLD_W = AE::signal CHLD => \&_sigchld;
1499	# child could be a zombie already, so make at least one round	1656	# child could be a zombie already, so make at least one round
1500	&_sigchld;	1657	&_sigchld;
1501	}	1658	}
1502		1659
1503	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1660	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1504	}	1661	};
1505		1662
1506	sub AnyEvent::Base::child::DESTROY {	1663	*AnyEvent::Base::child::DESTROY = sub {
1507	my ($pid, $cb) = @{$_[0]};	1664	my ($pid, $cb) = @{$_[0]};
1508		1665
1509	delete $PID_CB{$pid}{$cb};	1666	delete $PID_CB{$pid}{$cb};
1510	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1667	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1511		1668
1512	undef $CHLD_W unless keys %PID_CB;	1669	undef $CHLD_W unless keys %PID_CB;
		1670	};
		1671	};
		1672	die if $@;
		1673
		1674	&child
1513	}	1675	}
1514		1676
1515	# idle emulation is done by simply using a timer, regardless	1677	# idle emulation is done by simply using a timer, regardless
1516	# of whether the process is idle or not, and not letting	1678	# of whether the process is idle or not, and not letting
1517	# the callback use more than 50% of the time.	1679	# the callback use more than 50% of the time.
1518	sub idle {	1680	sub idle {
		1681	eval q{ # poor man's autoloading {}
		1682	*idle = sub {
1519	my (undef, %arg) = @_;	1683	my (undef, %arg) = @_;
1520		1684
1521	my ($cb, $w, $rcb) = $arg{cb};	1685	my ($cb, $w, $rcb) = $arg{cb};
1522		1686
1523	$rcb = sub {	1687	$rcb = sub {
1524	if ($cb) {	1688	if ($cb) {
1525	$w = _time;	1689	$w = _time;
1526	&$cb;	1690	&$cb;
1527	$w = _time - $w;	1691	$w = _time - $w;
1528		1692
1529	# never use more then 50% of the time for the idle watcher,	1693	# never use more then 50% of the time for the idle watcher,
1530	# within some limits	1694	# within some limits
1531	$w = 0.0001 if $w < 0.0001;	1695	$w = 0.0001 if $w < 0.0001;
1532	$w = 5 if $w > 5;	1696	$w = 5 if $w > 5;
1533		1697
1534	$w = AnyEvent->timer (after => $w, cb => $rcb);	1698	$w = AE::timer $w, 0, $rcb;
1535	} else {	1699	} else {
1536	# clean up...	1700	# clean up...
1537	undef $w;	1701	undef $w;
1538	undef $rcb;	1702	undef $rcb;
		1703	}
		1704	};
		1705
		1706	$w = AE::timer 0.05, 0, $rcb;
		1707
		1708	bless \\$cb, "AnyEvent::Base::idle"
1539	}	1709	};
		1710
		1711	*AnyEvent::Base::idle::DESTROY = sub {
		1712	undef $${$_[0]};
		1713	};
1540	};	1714	};
		1715	die if $@;
1541		1716
1542	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1717	&idle
1543
1544	bless \\$cb, "AnyEvent::Base::idle"
1545	}
1546
1547	sub AnyEvent::Base::idle::DESTROY {
1548	undef $${$_[0]};
1549	}	1718	}
1550		1719
1551	package AnyEvent::CondVar;	1720	package AnyEvent::CondVar;
1552		1721
1553	our @ISA = AnyEvent::CondVar::Base::;	1722	our @ISA = AnyEvent::CondVar::Base::;
…		…
1601	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1770	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1602	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1771	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1603	}	1772	}
1604		1773
1605	sub cb {	1774	sub cb {
1606	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1775	my $cv = shift;
		1776
		1777	@_
		1778	and $cv->{_ae_cb} = shift
		1779	and $cv->{_ae_sent}
		1780	and (delete $cv->{_ae_cb})->($cv);
		1781
1607	$_[0]{_ae_cb}	1782	$cv->{_ae_cb}
1608	}	1783	}
1609		1784
1610	sub begin {	1785	sub begin {
1611	++$_[0]{_ae_counter};	1786	++$_[0]{_ae_counter};
1612	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1787	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1821	warn "read: $input\n"; # output what has been read	1996	warn "read: $input\n"; # output what has been read
1822	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1997	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1823	},	1998	},
1824	);	1999	);
1825		2000
1826	my $time_watcher; # can only be used once
1827
1828	sub new_timer {
1829	$timer = AnyEvent->timer (after => 1, cb => sub {	2001	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1830	warn "timeout\n"; # print 'timeout' about every second	2002	warn "timeout\n"; # print 'timeout' at most every second
1831	&new_timer; # and restart the time
1832	});	2003	});
1833	}
1834
1835	new_timer; # create first timer
1836		2004
1837	$cv->recv; # wait until user enters /^q/i	2005	$cv->recv; # wait until user enters /^q/i
1838		2006
1839	=head1 REAL-WORLD EXAMPLE	2007	=head1 REAL-WORLD EXAMPLE
1840		2008
…		…
1913		2081
1914	The actual code goes further and collects all errors (C<die>s, exceptions)	2082	The actual code goes further and collects all errors (C<die>s, exceptions)
1915	that occurred during request processing. The C<result> method detects	2083	that occurred during request processing. The C<result> method detects
1916	whether an exception as thrown (it is stored inside the $txn object)	2084	whether an exception as thrown (it is stored inside the $txn object)
1917	and just throws the exception, which means connection errors and other	2085	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	2086	problems get reported to the code that tries to use the result, not in a
1919	random callback.	2087	random callback.
1920		2088
1921	All of this enables the following usage styles:	2089	All of this enables the following usage styles:
1922		2090
1923	1. Blocking:	2091	1. Blocking:
…		…
1971	through AnyEvent. The benchmark creates a lot of timers (with a zero	2139	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,	2140	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.	2141	which it is), lets them fire exactly once and destroys them again.
1974		2142
1975	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2143	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1976	distribution.	2144	distribution. It uses the L<AE> interface, which makes a real difference
		2145	for the EV and Perl backends only.
1977		2146
1978	=head3 Explanation of the columns	2147	=head3 Explanation of the columns
1979		2148
1980	I<watcher> is the number of event watchers created/destroyed. Since	2149	I<watcher> is the number of event watchers created/destroyed. Since
1981	different event models feature vastly different performances, each event	2150	different event models feature vastly different performances, each event
…		…
2002	watcher.	2171	watcher.
2003		2172
2004	=head3 Results	2173	=head3 Results
2005		2174
2006	name watchers bytes create invoke destroy comment	2175	name watchers bytes create invoke destroy comment
2007	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2176	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	2177	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	2178	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	2179	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	2180	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	2181	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	2182	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	2183	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	2184	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	2185	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	2186	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	2187	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2019		2188
2020	=head3 Discussion	2189	=head3 Discussion
2021		2190
2022	The benchmark does I<not> measure scalability of the event loop very	2191	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)	2192	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	2204	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	2205	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2037	cycles with POE.	2206	cycles with POE.
2038		2207
2039	C<EV> is the sole leader regarding speed and memory use, which are both	2208	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	2209	maximal/minimal, respectively. When using the L<AE> API there is zero
		2210	overhead (when going through the AnyEvent API create is about 5-6 times
		2211	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	2212	any other event loop and is still faster than Event natively).
2042	natively.
2043		2213
2044	The pure perl implementation is hit in a few sweet spots (both the	2214	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	2215	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	2216	interpreter and the backend itself). Nevertheless this shows that it
2047	adds very little overhead in itself. Like any select-based backend its	2217	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	2291	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	2292	(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.	2293	connections, most of which are idle at any one point in time.
2124		2294
2125	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2295	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2126	distribution.	2296	distribution. It uses the L<AE> interface, which makes a real difference
		2297	for the EV and Perl backends only.
2127		2298
2128	=head3 Explanation of the columns	2299	=head3 Explanation of the columns
2129		2300
2130	I<sockets> is the number of sockets, and twice the number of "servers" (as	2301	I<sockets> is the number of sockets, and twice the number of "servers" (as
2131	each server has a read and write socket end).	2302	each server has a read and write socket end).
…		…
2139	a new one that moves the timeout into the future.	2310	a new one that moves the timeout into the future.
2140		2311
2141	=head3 Results	2312	=head3 Results
2142		2313
2143	name sockets create request	2314	name sockets create request
2144	EV 20000 69.01 11.16	2315	EV 20000 62.66 7.99
2145	Perl 20000 73.32 35.87	2316	Perl 20000 68.32 32.64
2146	IOAsync 20000 157.00 98.14 epoll	2317	IOAsync 20000 174.06 101.15 epoll
2147	IOAsync 20000 159.31 616.06 poll	2318	IOAsync 20000 174.67 610.84 poll
2148	Event 20000 212.62 257.32	2319	Event 20000 202.69 242.91
2149	Glib 20000 651.16 1896.30	2320	Glib 20000 557.01 1689.52
2150	POE 20000 349.67 12317.24 uses POE::Loop::Event	2321	POE 20000 341.54 12086.32 uses POE::Loop::Event
2151		2322
2152	=head3 Discussion	2323	=head3 Discussion
2153		2324
2154	This benchmark I<does> measure scalability and overall performance of the	2325	This benchmark I<does> measure scalability and overall performance of the
2155	particular event loop.	2326	particular event loop.
…		…
2281	As you can see, the AnyEvent + EV combination even beats the	2452	As you can see, the AnyEvent + EV combination even beats the
2282	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2453	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2283	backend easily beats IO::Lambda and POE.	2454	backend easily beats IO::Lambda and POE.
2284		2455
2285	And even the 100% non-blocking version written using the high-level (and	2456	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	2457	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	2458	higher level ("unoptimised") abstractions by a large margin, even though
2288	in a non-blocking way.	2459	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2289		2460
2290	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2461	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	2462	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.	2463	part of the IO::Lambda distribution and were used without any changes.
2293		2464
2294		2465
2295	=head1 SIGNALS	2466	=head1 SIGNALS
2296		2467
2297	AnyEvent currently installs handlers for these signals:	2468	AnyEvent currently installs handlers for these signals:
…		…
2339	it's built-in modules) are required to use it.	2510	it's built-in modules) are required to use it.
2340		2511
2341	That does not mean that AnyEvent won't take advantage of some additional	2512	That does not mean that AnyEvent won't take advantage of some additional
2342	modules if they are installed.	2513	modules if they are installed.
2343		2514
2344	This section epxlains which additional modules will be used, and how they	2515	This section explains which additional modules will be used, and how they
2345	affect AnyEvent's operetion.	2516	affect AnyEvent's operation.
2346		2517
2347	=over 4	2518	=over 4
2348		2519
2349	=item L<Async::Interrupt>	2520	=item L<Async::Interrupt>
2350		2521
…		…
2355	catch the signals) with some delay (default is 10 seconds, look for	2526	catch the signals) with some delay (default is 10 seconds, look for
2356	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2527	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2357		2528
2358	If this module is available, then it will be used to implement signal	2529	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	2530	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	2531	will not be interrupted regularly, which is more efficient (and good for
2361	battery life on laptops).	2532	battery life on laptops).
2362		2533
2363	This affects not just the pure-perl event loop, but also other event loops	2534	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).	2535	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2365		2536
…		…
2377	automatic timer adjustments even when no monotonic clock is available,	2548	automatic timer adjustments even when no monotonic clock is available,
2378	can take avdantage of advanced kernel interfaces such as C<epoll> and	2549	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	2550	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>).	2551	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
2381		2552
		2553	If you only use backends that rely on another event loop (e.g. C<Tk>),
		2554	then this module will do nothing for you.
		2555
2382	=item L<Guard>	2556	=item L<Guard>
2383		2557
2384	The guard module, when used, will be used to implement	2558	The guard module, when used, will be used to implement
2385	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a	2559	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	2560	lot less memory), but otherwise doesn't affect guard operation much. It is
2387	purely used for performance.	2561	purely used for performance.
2388		2562
2389	=item L<JSON> and L<JSON::XS>	2563	=item L<JSON> and L<JSON::XS>
2390		2564
2391	This module is required when you want to read or write JSON data via	2565	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	2566	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.	2567	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		2568
2398	=item L<Net::SSLeay>	2569	=item L<Net::SSLeay>
2399		2570
2400	Implementing TLS/SSL in Perl is certainly interesting, but not very	2571	Implementing TLS/SSL in Perl is certainly interesting, but not very
2401	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with	2572	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
…		…
2412		2583
2413		2584
2414	=head1 FORK	2585	=head1 FORK
2415		2586
2416	Most event libraries are not fork-safe. The ones who are usually are	2587	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>	2588	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2418	calls. Only L<EV> is fully fork-aware.	2589	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2590	are usually badly thought-out hacks that are incompatible with fork in
		2591	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2592	continue event-processing in both parent and child (or both, if you know
		2593	what you are doing).
		2594
		2595	This means that, in general, you cannot fork and do event processing in
		2596	the child if the event library was initialised before the fork (which
		2597	usually happens when the first AnyEvent watcher is created, or the library
		2598	is loaded).
2419		2599
2420	If you have to fork, you must either do so I<before> creating your first	2600	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	2601	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.	2602	something completely out of the scope of AnyEvent.
		2603
		2604	The problem of doing event processing in the parent I<and> the child
		2605	is much more complicated: even for backends that I<are> fork-aware or
		2606	fork-safe, their behaviour is not usually what you want: fork clones all
		2607	watchers, that means all timers, I/O watchers etc. are active in both
		2608	parent and child, which is almost never what you want. USing C<exec>
		2609	to start worker children from some kind of manage rprocess is usually
		2610	preferred, because it is much easier and cleaner, at the expense of having
		2611	to have another binary.
2423		2612
2424		2613
2425	=head1 SECURITY CONSIDERATIONS	2614	=head1 SECURITY CONSIDERATIONS
2426		2615
2427	AnyEvent can be forced to load any event model via	2616	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 1.320 by root, Mon Apr 12 02:50:31 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 1.320 by root, Mon Apr 12 02:50:31 2010 UTC