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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.230 by root, Wed Jul 8 05:55:17 2009 UTC vs.
Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC

…		…
361	invocation, and callback invocation will be synchronous. Synchronous means	361	invocation, and callback invocation will be synchronous. Synchronous means
362	that it might take a while until the signal gets handled by the process,	362	that it might take a while until the signal gets handled by the process,
363	but it is guaranteed not to interrupt any other callbacks.	363	but it is guaranteed not to interrupt any other callbacks.
364		364
365	The main advantage of using these watchers is that you can share a signal	365	The main advantage of using these watchers is that you can share a signal
366	between multiple watchers.	366	between multiple watchers, and AnyEvent will ensure that signals will not
		367	interrupt your program at bad times.
367		368
368	This watcher might use C<%SIG>, so programs overwriting those signals	369	This watcher might use C<%SIG> (depending on the event loop used),
369	directly will likely not work correctly.	370	so programs overwriting those signals directly will likely not work
		371	correctly.
370		372
371	Example: exit on SIGINT	373	Example: exit on SIGINT
372		374
373	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	375	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		376
		377	=head3 Signal Races, Delays and Workarounds
		378
		379	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
		380	callbacks to signals in a generic way, which is a pity, as you cannot do
		381	race-free signal handling in perl. AnyEvent will try to do it's best, but
		382	in some cases, signals will be delayed. The maximum time a signal might
		383	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10
		384	seconds). This variable can be changed only before the first signal
		385	watcher is created, and should be left alone otherwise. Higher values
		386	will cause fewer spurious wake-ups, which is better for power and CPU
		387	saving. All these problems can be avoided by installing the optional
		388	L<Async::Interrupt> module. This will not work with inherently broken
		389	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>
		390	currently, as POE does it's own workaround with one-second latency). With
		391	those, you just have to suffer the delays.
374		392
375	=head2 CHILD PROCESS WATCHERS	393	=head2 CHILD PROCESS WATCHERS
376		394
377	You can also watch on a child process exit and catch its exit status.	395	You can also watch on a child process exit and catch its exit status.
378		396
…		…
403		421
404	This means you cannot create a child watcher as the very first	422	This means you cannot create a child watcher as the very first
405	thing in an AnyEvent program, you I<have> to create at least one	423	thing in an AnyEvent program, you I<have> to create at least one
406	watcher before you C<fork> the child (alternatively, you can call	424	watcher before you C<fork> the child (alternatively, you can call
407	C<AnyEvent::detect>).	425	C<AnyEvent::detect>).
		426
		427	As most event loops do not support waiting for child events, they will be
		428	emulated by AnyEvent in most cases, in which the latency and race problems
		429	mentioned in the description of signal watchers apply.
408		430
409	Example: fork a process and wait for it	431	Example: fork a process and wait for it
410		432
411	my $done = AnyEvent->condvar;	433	my $done = AnyEvent->condvar;
412		434
…		…
463		485
464	If you are familiar with some event loops you will know that all of them	486	If you are familiar with some event loops you will know that all of them
465	require you to run some blocking "loop", "run" or similar function that	487	require you to run some blocking "loop", "run" or similar function that
466	will actively watch for new events and call your callbacks.	488	will actively watch for new events and call your callbacks.
467		489
468	AnyEvent is different, it expects somebody else to run the event loop and	490	AnyEvent is slightly different: it expects somebody else to run the event
469	will only block when necessary (usually when told by the user).	491	loop and will only block when necessary (usually when told by the user).
470		492
471	The instrument to do that is called a "condition variable", so called	493	The instrument to do that is called a "condition variable", so called
472	because they represent a condition that must become true.	494	because they represent a condition that must become true.
473		495
		496	Now is probably a good time to look at the examples further below.
		497
474	Condition variables can be created by calling the C<< AnyEvent->condvar	498	Condition variables can be created by calling the C<< AnyEvent->condvar
475	>> method, usually without arguments. The only argument pair allowed is	499	>> method, usually without arguments. The only argument pair allowed is
476
477	C<cb>, which specifies a callback to be called when the condition variable	500	C<cb>, which specifies a callback to be called when the condition variable
478	becomes true, with the condition variable as the first argument (but not	501	becomes true, with the condition variable as the first argument (but not
479	the results).	502	the results).
480		503
481	After creation, the condition variable is "false" until it becomes "true"	504	After creation, the condition variable is "false" until it becomes "true"
…		…
530	after => 1,	553	after => 1,
531	cb => sub { $result_ready->send },	554	cb => sub { $result_ready->send },
532	);	555	);
533		556
534	# this "blocks" (while handling events) till the callback	557	# this "blocks" (while handling events) till the callback
535	# calls send	558	# calls -<send
536	$result_ready->recv;	559	$result_ready->recv;
537		560
538	Example: wait for a timer, but take advantage of the fact that	561	Example: wait for a timer, but take advantage of the fact that condition
539	condition variables are also code references.	562	variables are also callable directly.
540		563
541	my $done = AnyEvent->condvar;	564	my $done = AnyEvent->condvar;
542	my $delay = AnyEvent->timer (after => 5, cb => $done);	565	my $delay = AnyEvent->timer (after => 5, cb => $done);
543	$done->recv;	566	$done->recv;
544		567
…		…
550		573
551	...	574	...
552		575
553	my @info = $couchdb->info->recv;	576	my @info = $couchdb->info->recv;
554		577
555	And this is how you would just ste a callback to be called whenever the	578	And this is how you would just set a callback to be called whenever the
556	results are available:	579	results are available:
557		580
558	$couchdb->info->cb (sub {	581	$couchdb->info->cb (sub {
559	my @info = $_[0]->recv;	582	my @info = $_[0]->recv;
560	});	583	});
…		…
578	immediately from within send.	601	immediately from within send.
579		602
580	Any arguments passed to the C<send> call will be returned by all	603	Any arguments passed to the C<send> call will be returned by all
581	future C<< ->recv >> calls.	604	future C<< ->recv >> calls.
582		605
583	Condition variables are overloaded so one can call them directly	606	Condition variables are overloaded so one can call them directly (as if
584	(as a code reference). Calling them directly is the same as calling	607	they were a code reference). Calling them directly is the same as calling
585	C<send>. Note, however, that many C-based event loops do not handle	608	C<send>.
586	overloading, so as tempting as it may be, passing a condition variable
587	instead of a callback does not work. Both the pure perl and EV loops
588	support overloading, however, as well as all functions that use perl to
589	invoke a callback (as in L<AnyEvent::Socket> and L<AnyEvent::DNS> for
590	example).
591		609
592	=item $cv->croak ($error)	610	=item $cv->croak ($error)
593		611
594	Similar to send, but causes all call's to C<< ->recv >> to invoke	612	Similar to send, but causes all call's to C<< ->recv >> to invoke
595	C<Carp::croak> with the given error message/object/scalar.	613	C<Carp::croak> with the given error message/object/scalar.
596		614
597	This can be used to signal any errors to the condition variable	615	This can be used to signal any errors to the condition variable
598	user/consumer.	616	user/consumer. Doing it this way instead of calling C<croak> directly
		617	delays the error detetcion, but has the overwhelmign advantage that it
		618	diagnoses the error at the place where the result is expected, and not
		619	deep in some event clalback without connection to the actual code causing
		620	the problem.
599		621
600	=item $cv->begin ([group callback])	622	=item $cv->begin ([group callback])
601		623
602	=item $cv->end	624	=item $cv->end
603		625
…		…
699	function will call C<croak>.	721	function will call C<croak>.
700		722
701	In list context, all parameters passed to C<send> will be returned,	723	In list context, all parameters passed to C<send> will be returned,
702	in scalar context only the first one will be returned.	724	in scalar context only the first one will be returned.
703		725
		726	Note that doing a blocking wait in a callback is not supported by any
		727	event loop, that is, recursive invocation of a blocking C<< ->recv
		728	>> is not allowed, and the C<recv> call will C<croak> if such a
		729	condition is detected. This condition can be slightly loosened by using
		730	L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from
		731	any thread that doesn't run the event loop itself.
		732
704	Not all event models support a blocking wait - some die in that case	733	Not all event models support a blocking wait - some die in that case
705	(programs might want to do that to stay interactive), so I<if you are	734	(programs might want to do that to stay interactive), so I<if you are
706	using this from a module, never require a blocking wait>, but let the	735	using this from a module, never require a blocking wait>. Instead, let the
707	caller decide whether the call will block or not (for example, by coupling	736	caller decide whether the call will block or not (for example, by coupling
708	condition variables with some kind of request results and supporting	737	condition variables with some kind of request results and supporting
709	callbacks so the caller knows that getting the result will not block,	738	callbacks so the caller knows that getting the result will not block,
710	while still supporting blocking waits if the caller so desires).	739	while still supporting blocking waits if the caller so desires).
711		740
712	Another reason I<never> to C<< ->recv >> in a module is that you cannot
713	sensibly have two C<< ->recv >>'s in parallel, as that would require
714	multiple interpreters or coroutines/threads, none of which C<AnyEvent>
715	can supply.
716
717	The L<Coro> module, however, I<can> and I<does> supply coroutines and, in
718	fact, L<Coro::AnyEvent> replaces AnyEvent's condvars by coroutine-safe
719	versions and also integrates coroutines into AnyEvent, making blocking
720	C<< ->recv >> calls perfectly safe as long as they are done from another
721	coroutine (one that doesn't run the event loop).
722
723	You can ensure that C<< -recv >> never blocks by setting a callback and	741	You can ensure that C<< -recv >> never blocks by setting a callback and
724	only calling C<< ->recv >> from within that callback (or at a later	742	only calling C<< ->recv >> from within that callback (or at a later
725	time). This will work even when the event loop does not support blocking	743	time). This will work even when the event loop does not support blocking
726	waits otherwise.	744	waits otherwise.
727		745
…		…
740	variable itself. Calling C<recv> inside the callback or at any later time	758	variable itself. Calling C<recv> inside the callback or at any later time
741	is guaranteed not to block.	759	is guaranteed not to block.
742		760
743	=back	761	=back
744		762
		763	=head1 SUPPORTED EVENT LOOPS/BACKENDS
		764
		765	The available backend classes are (every class has its own manpage):
		766
		767	=over 4
		768
		769	=item Backends that are autoprobed when no other event loop can be found.
		770
		771	EV is the preferred backend when no other event loop seems to be in
		772	use. If EV is not installed, then AnyEvent will try Event, and, failing
		773	that, will fall back to its own pure-perl implementation, which is
		774	available everywhere as it comes with AnyEvent itself.
		775
		776	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
		777	AnyEvent::Impl::Event based on Event, very stable, few glitches.
		778	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
		779
		780	=item Backends that are transparently being picked up when they are used.
		781
		782	These will be used when they are currently loaded when the first watcher
		783	is created, in which case it is assumed that the application is using
		784	them. This means that AnyEvent will automatically pick the right backend
		785	when the main program loads an event module before anything starts to
		786	create watchers. Nothing special needs to be done by the main program.
		787
		788	AnyEvent::Impl::Glib based on Glib, slow but very stable.
		789	AnyEvent::Impl::Tk based on Tk, very broken.
		790	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
		791	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		792
		793	=item Backends with special needs.
		794
		795	Qt requires the Qt::Application to be instantiated first, but will
		796	otherwise be picked up automatically. As long as the main program
		797	instantiates the application before any AnyEvent watchers are created,
		798	everything should just work.
		799
		800	AnyEvent::Impl::Qt based on Qt.
		801
		802	Support for IO::Async can only be partial, as it is too broken and
		803	architecturally limited to even support the AnyEvent API. It also
		804	is the only event loop that needs the loop to be set explicitly, so
		805	it can only be used by a main program knowing about AnyEvent. See
		806	L<AnyEvent::Impl::Async> for the gory details.
		807
		808	AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed.
		809
		810	=item Event loops that are indirectly supported via other backends.
		811
		812	Some event loops can be supported via other modules:
		813
		814	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.
		815
		816	B<WxWidgets> has no support for watching file handles. However, you can
		817	use WxWidgets through the POE adaptor, as POE has a Wx backend that simply
		818	polls 20 times per second, which was considered to be too horrible to even
		819	consider for AnyEvent.
		820
		821	B<Prima> is not supported as nobody seems to be using it, but it has a POE
		822	backend, so it can be supported through POE.
		823
		824	AnyEvent knows about both L<Prima> and L<Wx>, however, and will try to
		825	load L<POE> when detecting them, in the hope that POE will pick them up,
		826	in which case everything will be automatic.
		827
		828	=back
		829
745	=head1 GLOBAL VARIABLES AND FUNCTIONS	830	=head1 GLOBAL VARIABLES AND FUNCTIONS
746		831
		832	These are not normally required to use AnyEvent, but can be useful to
		833	write AnyEvent extension modules.
		834
747	=over 4	835	=over 4
748		836
749	=item $AnyEvent::MODEL	837	=item $AnyEvent::MODEL
750		838
751	Contains C<undef> until the first watcher is being created. Then it	839	Contains C<undef> until the first watcher is being created, before the
		840	backend has been autodetected.
		841
752	contains the event model that is being used, which is the name of the	842	Afterwards it contains the event model that is being used, which is the
753	Perl class implementing the model. This class is usually one of the	843	name of the Perl class implementing the model. This class is usually one
754	C<AnyEvent::Impl:xxx> modules, but can be any other class in the case	844	of the C<AnyEvent::Impl:xxx> modules, but can be any other class in the
755	AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode>).	845	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it
756		846	will be C<urxvt::anyevent>).
757	The known classes so far are:
758
759	AnyEvent::Impl::EV based on EV (an interface to libev, best choice).
760	AnyEvent::Impl::Event based on Event, second best choice.
761	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
762	AnyEvent::Impl::Glib based on Glib, third-best choice.
763	AnyEvent::Impl::Tk based on Tk, very bad choice.
764	AnyEvent::Impl::Qt based on Qt, cannot be autoprobed (see its docs).
765	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
766	AnyEvent::Impl::POE based on POE, not generic enough for full support.
767
768	# warning, support for IO::Async is only partial, as it is too broken
769	# and limited toe ven support the AnyEvent API. See AnyEvent::Impl::Async.
770	AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed (see its docs).
771
772	There is no support for WxWidgets, as WxWidgets has no support for
773	watching file handles. However, you can use WxWidgets through the
774	POE Adaptor, as POE has a Wx backend that simply polls 20 times per
775	second, which was considered to be too horrible to even consider for
776	AnyEvent. Likewise, other POE backends can be used by AnyEvent by using
777	it's adaptor.
778
779	AnyEvent knows about L<Prima> and L<Wx> and will try to use L<POE> when
780	autodetecting them.
781		847
782	=item AnyEvent::detect	848	=item AnyEvent::detect
783		849
784	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	850	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
785	if necessary. You should only call this function right before you would	851	if necessary. You should only call this function right before you would
786	have created an AnyEvent watcher anyway, that is, as late as possible at	852	have created an AnyEvent watcher anyway, that is, as late as possible at
787	runtime.	853	runtime, and not e.g. while initialising of your module.
		854
		855	If you need to do some initialisation before AnyEvent watchers are
		856	created, use C<post_detect>.
788		857
789	=item $guard = AnyEvent::post_detect { BLOCK }	858	=item $guard = AnyEvent::post_detect { BLOCK }
790		859
791	Arranges for the code block to be executed as soon as the event model is	860	Arranges for the code block to be executed as soon as the event model is
792	autodetected (or immediately if this has already happened).	861	autodetected (or immediately if this has already happened).
		862
		863	The block will be executed I<after> the actual backend has been detected
		864	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been
		865	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do
		866	other initialisations - see the sources of L<AnyEvent::Strict> or
		867	L<AnyEvent::AIO> to see how this is used.
		868
		869	The most common usage is to create some global watchers, without forcing
		870	event module detection too early, for example, L<AnyEvent::AIO> creates
		871	and installs the global L<IO::AIO> watcher in a C<post_detect> block to
		872	avoid autodetecting the event module at load time.
793		873
794	If called in scalar or list context, then it creates and returns an object	874	If called in scalar or list context, then it creates and returns an object
795	that automatically removes the callback again when it is destroyed. See	875	that automatically removes the callback again when it is destroyed. See
796	L<Coro::BDB> for a case where this is useful.	876	L<Coro::BDB> for a case where this is useful.
797		877
…		…
800	If there are any code references in this array (you can C<push> to it	880	If there are any code references in this array (you can C<push> to it
801	before or after loading AnyEvent), then they will called directly after	881	before or after loading AnyEvent), then they will called directly after
802	the event loop has been chosen.	882	the event loop has been chosen.
803		883
804	You should check C<$AnyEvent::MODEL> before adding to this array, though:	884	You should check C<$AnyEvent::MODEL> before adding to this array, though:
805	if it contains a true value then the event loop has already been detected,	885	if it is defined then the event loop has already been detected, and the
806	and the array will be ignored.	886	array will be ignored.
807		887
808	Best use C<AnyEvent::post_detect { BLOCK }> instead.	888	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
		889	it,as it takes care of these details.
		890
		891	This variable is mainly useful for modules that can do something useful
		892	when AnyEvent is used and thus want to know when it is initialised, but do
		893	not need to even load it by default. This array provides the means to hook
		894	into AnyEvent passively, without loading it.
809		895
810	=back	896	=back
811		897
812	=head1 WHAT TO DO IN A MODULE	898	=head1 WHAT TO DO IN A MODULE
813		899
…		…
960		1046
961	=cut	1047	=cut
962		1048
963	package AnyEvent;	1049	package AnyEvent;
964		1050
		1051	# basically a tuned-down version of common::sense
		1052	sub common_sense {
965	no warnings;	1053	# no warnings
		1054	${^WARNING_BITS} ^= ${^WARNING_BITS};
966	use strict qw(vars subs);	1055	# use strict vars subs
		1056	$^H \|= 0x00000600;
		1057	}
967		1058
		1059	BEGIN { AnyEvent::common_sense }
		1060
968	use Carp;	1061	use Carp ();
969		1062
970	our $VERSION = 4.8;	1063	our $VERSION = 4.85;
971	our $MODEL;	1064	our $MODEL;
972		1065
973	our $AUTOLOAD;	1066	our $AUTOLOAD;
974	our @ISA;	1067	our @ISA;
975		1068
976	our @REGISTRY;	1069	our @REGISTRY;
977		1070
978	our $WIN32;	1071	our $WIN32;
		1072
		1073	our $VERBOSE;
979		1074
980	BEGIN {	1075	BEGIN {
981	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1076	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
982	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1077	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";
983		1078
984	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1079	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
985	if ${^TAINT};	1080	if ${^TAINT};
986	}
987		1081
988	our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1082	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
		1083
		1084	}
		1085
		1086	our $MAX_SIGNAL_LATENCY = 10;
989		1087
990	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1088	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
991		1089
992	{	1090	{
993	my $idx;	1091	my $idx;
…		…
1001	[Event:: => AnyEvent::Impl::Event::],	1099	[Event:: => AnyEvent::Impl::Event::],
1002	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1100	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],
1003	# everything below here will not be autoprobed	1101	# everything below here will not be autoprobed
1004	# as the pureperl backend should work everywhere	1102	# as the pureperl backend should work everywhere
1005	# and is usually faster	1103	# and is usually faster
1006	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1007	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1104	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
1008	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1105	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1106	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1009	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1107	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1010	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1108	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1011	[Wx:: => AnyEvent::Impl::POE::],	1109	[Wx:: => AnyEvent::Impl::POE::],
1012	[Prima:: => AnyEvent::Impl::POE::],	1110	[Prima:: => AnyEvent::Impl::POE::],
1013	# IO::Async is just too broken - we would need workaorunds for its	1111	# IO::Async is just too broken - we would need workarounds for its
1014	# byzantine signal and broken child handling, among others.	1112	# byzantine signal and broken child handling, among others.
1015	# IO::Async is rather hard to detect, as it doesn't have any	1113	# IO::Async is rather hard to detect, as it doesn't have any
1016	# obvious default class.	1114	# obvious default class.
1017	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1115	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1018	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1116	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
…		…
1044	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1142	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1045	}	1143	}
1046		1144
1047	sub detect() {	1145	sub detect() {
1048	unless ($MODEL) {	1146	unless ($MODEL) {
1049	no strict 'refs';
1050	local $SIG{__DIE__};	1147	local $SIG{__DIE__};
1051		1148
1052	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1149	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
1053	my $model = "AnyEvent::Impl::$1";	1150	my $model = "AnyEvent::Impl::$1";
1054	if (eval "require $model") {	1151	if (eval "require $model") {
1055	$MODEL = $model;	1152	$MODEL = $model;
1056	warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1;	1153	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1057	} else {	1154	} else {
1058	warn "AnyEvent: unable to load model '$model' (from \$PERL_ANYEVENT_MODEL):\n$@" if $verbose;	1155	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
1059	}	1156	}
1060	}	1157	}
1061		1158
1062	# check for already loaded models	1159	# check for already loaded models
1063	unless ($MODEL) {	1160	unless ($MODEL) {
1064	for (@REGISTRY, @models) {	1161	for (@REGISTRY, @models) {
1065	my ($package, $model) = @$_;	1162	my ($package, $model) = @$_;
1066	if (${"$package\::VERSION"} > 0) {	1163	if (${"$package\::VERSION"} > 0) {
1067	if (eval "require $model") {	1164	if (eval "require $model") {
1068	$MODEL = $model;	1165	$MODEL = $model;
1069	warn "AnyEvent: autodetected model '$model', using it.\n" if $verbose > 1;	1166	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1070	last;	1167	last;
1071	}	1168	}
1072	}	1169	}
1073	}	1170	}
1074		1171
…		…
1079	my ($package, $model) = @$_;	1176	my ($package, $model) = @$_;
1080	if (eval "require $package"	1177	if (eval "require $package"
1081	and ${"$package\::VERSION"} > 0	1178	and ${"$package\::VERSION"} > 0
1082	and eval "require $model") {	1179	and eval "require $model") {
1083	$MODEL = $model;	1180	$MODEL = $model;
1084	warn "AnyEvent: autoprobed model '$model', using it.\n" if $verbose > 1;	1181	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;
1085	last;	1182	last;
1086	}	1183	}
1087	}	1184	}
1088		1185
1089	$MODEL	1186	$MODEL
…		…
1105		1202
1106	sub AUTOLOAD {	1203	sub AUTOLOAD {
1107	(my $func = $AUTOLOAD) =~ s/.*://;	1204	(my $func = $AUTOLOAD) =~ s/.*://;
1108		1205
1109	$method{$func}	1206	$method{$func}
1110	or croak "$func: not a valid method for AnyEvent objects";	1207	or Carp::croak "$func: not a valid method for AnyEvent objects";
1111		1208
1112	detect unless $MODEL;	1209	detect unless $MODEL;
1113		1210
1114	my $class = shift;	1211	my $class = shift;
1115	$class->$func (@_);	1212	$class->$func (@_);
…		…
1120	# allow only one watcher per fd, so we dup it to get a different one).	1217	# allow only one watcher per fd, so we dup it to get a different one).
1121	sub _dupfh($$;$$) {	1218	sub _dupfh($$;$$) {
1122	my ($poll, $fh, $r, $w) = @_;	1219	my ($poll, $fh, $r, $w) = @_;
1123		1220
1124	# cygwin requires the fh mode to be matching, unix doesn't	1221	# cygwin requires the fh mode to be matching, unix doesn't
1125	my ($rw, $mode) = $poll eq "r" ? ($r, "<") : ($w, ">");	1222	my ($rw, $mode) = $poll eq "r" ? ($r, "<&") : ($w, ">&");
1126		1223
1127	open my $fh2, "$mode&", $fh	1224	open my $fh2, $mode, $fh
1128	or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,";	1225	or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,";
1129		1226
1130	# we assume CLOEXEC is already set by perl in all important cases	1227	# we assume CLOEXEC is already set by perl in all important cases
1131		1228
1132	($fh2, $rw)	1229	($fh2, $rw)
…		…
1134		1231
1135	package AnyEvent::Base;	1232	package AnyEvent::Base;
1136		1233
1137	# default implementations for many methods	1234	# default implementations for many methods
1138		1235
1139	BEGIN {	1236	sub _time {
		1237	# probe for availability of Time::HiRes
1140	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1238	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
		1239	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1141	*_time = \&Time::HiRes::time;	1240	*_time = \&Time::HiRes::time;
1142	# if (eval "use POSIX (); (POSIX::times())...	1241	# if (eval "use POSIX (); (POSIX::times())...
1143	} else {	1242	} else {
		1243	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1144	*_time = sub { time }; # epic fail	1244	*_time = sub { time }; # epic fail
1145	}	1245	}
		1246
		1247	&_time
1146	}	1248	}
1147		1249
1148	sub time { _time }	1250	sub time { _time }
1149	sub now { _time }	1251	sub now { _time }
1150	sub now_update { }	1252	sub now_update { }
…		…
1155	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1257	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
1156	}	1258	}
1157		1259
1158	# default implementation for ->signal	1260	# default implementation for ->signal
1159		1261
		1262	our $HAVE_ASYNC_INTERRUPT;
1160	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1263	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
		1264	our (%SIG_ASY, %SIG_ASY_W);
		1265	our ($SIG_COUNT, $SIG_TW);
1161		1266
1162	sub _signal_exec {	1267	sub _signal_exec {
		1268	$HAVE_ASYNC_INTERRUPT
		1269	? $SIGPIPE_R->drain
1163	sysread $SIGPIPE_R, my $dummy, 4;	1270	: sysread $SIGPIPE_R, my $dummy, 9;
1164		1271
1165	while (%SIG_EV) {	1272	while (%SIG_EV) {
1166	for (keys %SIG_EV) {	1273	for (keys %SIG_EV) {
1167	delete $SIG_EV{$_};	1274	delete $SIG_EV{$_};
1168	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1275	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1169	}	1276	}
1170	}	1277	}
1171	}	1278	}
1172		1279
		1280	# install a dumym wakeupw atcher to reduce signal catching latency
		1281	sub _sig_add() {
		1282	unless ($SIG_COUNT++) {
		1283	# try to align timer on a full-second boundary, if possible
		1284	my $NOW = AnyEvent->now;
		1285
		1286	$SIG_TW = AnyEvent->timer (
		1287	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
		1288	interval => $MAX_SIGNAL_LATENCY,
		1289	cb => sub { }, # just for the PERL_ASYNC_CHECK
		1290	);
		1291	}
		1292	}
		1293
		1294	sub _sig_del {
		1295	undef $SIG_TW
		1296	unless --$SIG_COUNT;
		1297	}
		1298
		1299	sub _signal {
		1300	my (undef, %arg) = @_;
		1301
		1302	my $signal = uc $arg{signal}
		1303	or Carp::croak "required option 'signal' is missing";
		1304
		1305	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1306
		1307	if ($HAVE_ASYNC_INTERRUPT) {
		1308	# async::interrupt
		1309
		1310	$SIG_ASY{$signal} \|\|= do {
		1311	my $asy = new Async::Interrupt
		1312	cb => sub { undef $SIG_EV{$signal} },
		1313	signal => $signal,
		1314	pipe => [$SIGPIPE_R->filenos],
		1315	;
		1316	$asy->pipe_autodrain (0);
		1317
		1318	$asy
		1319	};
		1320
		1321	} else {
		1322	# pure perl
		1323
		1324	$SIG{$signal} \|\|= sub {
		1325	local $!;
		1326	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1327	undef $SIG_EV{$signal};
		1328	};
		1329
		1330	# can't do signal processing without introducing races in pure perl,
		1331	# so limit the signal latency.
		1332	_sig_add;
		1333	}
		1334
		1335	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1336	}
		1337
1173	sub signal {	1338	sub signal {
1174	my (undef, %arg) = @_;	1339	# probe for availability of Async::Interrupt
		1340	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
		1341	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1175		1342
1176	unless ($SIGPIPE_R) {	1343	$HAVE_ASYNC_INTERRUPT = 1;
		1344	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1345	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
		1346
		1347	} else {
		1348	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1349
1177	require Fcntl;	1350	require Fcntl;
1178		1351
1179	if (AnyEvent::WIN32) {	1352	if (AnyEvent::WIN32) {
1180	require AnyEvent::Util;	1353	require AnyEvent::Util;
1181		1354
…		…
1196	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1369	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1197		1370
1198	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);	1371	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1199	}	1372	}
1200		1373
1201	my $signal = uc $arg{signal}	1374	*signal = \&_signal;
1202	or Carp::croak "required option 'signal' is missing";	1375	&signal
1203
1204	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1205	$SIG{$signal} \|\|= sub {
1206	local $!;
1207	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1208	undef $SIG_EV{$signal};
1209	};
1210
1211	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1212	}	1376	}
1213		1377
1214	sub AnyEvent::Base::signal::DESTROY {	1378	sub AnyEvent::Base::signal::DESTROY {
1215	my ($signal, $cb) = @{$_[0]};	1379	my ($signal, $cb) = @{$_[0]};
1216		1380
		1381	_sig_del;
		1382
1217	delete $SIG_CB{$signal}{$cb};	1383	delete $SIG_CB{$signal}{$cb};
1218		1384
		1385	$HAVE_ASYNC_INTERRUPT
		1386	? delete $SIG_ASY{$signal}
1219	# delete doesn't work with older perls - they then	1387	: # delete doesn't work with older perls - they then
1220	# print weird messages, or just unconditionally exit	1388	# print weird messages, or just unconditionally exit
1221	# instead of getting the default action.	1389	# instead of getting the default action.
		1390	undef $SIG{$signal}
1222	undef $SIG{$signal} unless keys %{ $SIG_CB{$signal} };	1391	unless keys %{ $SIG_CB{$signal} };
1223	}	1392	}
1224		1393
1225	# default implementation for ->child	1394	# default implementation for ->child
1226		1395
1227	our %PID_CB;	1396	our %PID_CB;
…		…
1229	our $CHLD_DELAY_W;	1398	our $CHLD_DELAY_W;
1230	our $WNOHANG;	1399	our $WNOHANG;
1231		1400
1232	sub _sigchld {	1401	sub _sigchld {
1233	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1402	while (0 < (my $pid = waitpid -1, $WNOHANG)) {
		1403	$_->($pid, $?)
1234	$_->($pid, $?) for (values %{ $PID_CB{$pid} \|\| {} }),	1404	for values %{ $PID_CB{$pid} \|\| {} },
1235	(values %{ $PID_CB{0} \|\| {} });	1405	values %{ $PID_CB{0} \|\| {} };
1236	}	1406	}
1237	}	1407	}
1238		1408
1239	sub child {	1409	sub child {
1240	my (undef, %arg) = @_;	1410	my (undef, %arg) = @_;
…		…
1242	defined (my $pid = $arg{pid} + 0)	1412	defined (my $pid = $arg{pid} + 0)
1243	or Carp::croak "required option 'pid' is missing";	1413	or Carp::croak "required option 'pid' is missing";
1244		1414
1245	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1415	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1246		1416
		1417	# WNOHANG is almost cetrainly 1 everywhere
		1418	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
		1419	? 1
1247	$WNOHANG \|\|= eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1420	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1248		1421
1249	unless ($CHLD_W) {	1422	unless ($CHLD_W) {
1250	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1423	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);
1251	# child could be a zombie already, so make at least one round	1424	# child could be a zombie already, so make at least one round
1252	&_sigchld;	1425	&_sigchld;
…		…
1304		1477
1305	our @ISA = AnyEvent::CondVar::Base::;	1478	our @ISA = AnyEvent::CondVar::Base::;
1306		1479
1307	package AnyEvent::CondVar::Base;	1480	package AnyEvent::CondVar::Base;
1308		1481
1309	use overload	1482	#use overload
1310	'&{}' => sub { my $self = shift; sub { $self->send (@_) } },	1483	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },
1311	fallback => 1;	1484	# fallback => 1;
		1485
		1486	# save 300+ kilobytes by dirtily hardcoding overloading
		1487	${"AnyEvent::CondVar::Base::OVERLOAD"}{dummy}++; # Register with magic by touching.
		1488	*{'AnyEvent::CondVar::Base::()'} = sub { }; # "Make it findable via fetchmethod."
		1489	*{'AnyEvent::CondVar::Base::(&{}'} = sub { my $self = shift; sub { $self->send (@_) } }; # &{}
		1490	${'AnyEvent::CondVar::Base::()'} = 1; # fallback
		1491
		1492	our $WAITING;
1312		1493
1313	sub _send {	1494	sub _send {
1314	# nop	1495	# nop
1315	}	1496	}
1316		1497
…		…
1329	sub ready {	1510	sub ready {
1330	$_[0]{_ae_sent}	1511	$_[0]{_ae_sent}
1331	}	1512	}
1332		1513
1333	sub _wait {	1514	sub _wait {
		1515	$WAITING
		1516	and !$_[0]{_ae_sent}
		1517	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
		1518
		1519	local $WAITING = 1;
1334	AnyEvent->one_event while !$_[0]{_ae_sent};	1520	AnyEvent->one_event while !$_[0]{_ae_sent};
1335	}	1521	}
1336		1522
1337	sub recv {	1523	sub recv {
1338	$_[0]->_wait;	1524	$_[0]->_wait;
…		…
1400	C<PERL_ANYEVENT_MODEL>.	1586	C<PERL_ANYEVENT_MODEL>.
1401		1587
1402	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	1588	When set to C<2> or higher, cause AnyEvent to report to STDERR which event
1403	model it chooses.	1589	model it chooses.
1404		1590
		1591	When set to C<8> or higher, then AnyEvent will report extra information on
		1592	which optional modules it loads and how it implements certain features.
		1593
1405	=item C<PERL_ANYEVENT_STRICT>	1594	=item C<PERL_ANYEVENT_STRICT>
1406		1595
1407	AnyEvent does not do much argument checking by default, as thorough	1596	AnyEvent does not do much argument checking by default, as thorough
1408	argument checking is very costly. Setting this variable to a true value	1597	argument checking is very costly. Setting this variable to a true value
1409	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly	1598	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly
1410	check the arguments passed to most method calls. If it finds any problems,	1599	check the arguments passed to most method calls. If it finds any problems,
1411	it will croak.	1600	it will croak.
1412		1601
1413	In other words, enables "strict" mode.	1602	In other words, enables "strict" mode.
1414		1603
1415	Unlike C<use strict>, it is definitely recommended to keep it off in	1604	Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense>
1416	production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while	1605	>>, it is definitely recommended to keep it off in production. Keeping
1417	developing programs can be very useful, however.	1606	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
		1607	can be very useful, however.
1418		1608
1419	=item C<PERL_ANYEVENT_MODEL>	1609	=item C<PERL_ANYEVENT_MODEL>
1420		1610
1421	This can be used to specify the event model to be used by AnyEvent, before	1611	This can be used to specify the event model to be used by AnyEvent, before
1422	auto detection and -probing kicks in. It must be a string consisting	1612	auto detection and -probing kicks in. It must be a string consisting
…		…
1484		1674
1485	When neither C<ca_file> nor C<ca_path> was specified during	1675	When neither C<ca_file> nor C<ca_path> was specified during
1486	L<AnyEvent::TLS> context creation, and either of these environment	1676	L<AnyEvent::TLS> context creation, and either of these environment
1487	variables exist, they will be used to specify CA certificate locations	1677	variables exist, they will be used to specify CA certificate locations
1488	instead of a system-dependent default.	1678	instead of a system-dependent default.
		1679
		1680	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
		1681
		1682	When these are set to C<1>, then the respective modules are not
		1683	loaded. Mostly good for testing AnyEvent itself.
1489		1684
1490	=back	1685	=back
1491		1686
1492	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE	1687	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE
1493		1688
…		…
2032		2227
2033	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher	2228	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher
2034	emulation for event loops that do not support them natively. Also, some	2229	emulation for event loops that do not support them natively. Also, some
2035	event loops install a similar handler.	2230	event loops install a similar handler.
2036		2231
2037	If, when AnyEvent is loaded, SIGCHLD is set to IGNORE, then AnyEvent will	2232	Additionally, when AnyEvent is loaded and SIGCHLD is set to IGNORE, then
2038	reset it to default, to avoid losing child exit statuses.	2233	AnyEvent will reset it to default, to avoid losing child exit statuses.
2039		2234
2040	=item SIGPIPE	2235	=item SIGPIPE
2041		2236
2042	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>	2237	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>
2043	when AnyEvent gets loaded.	2238	when AnyEvent gets loaded.
…		…
2061	if $SIG{CHLD} eq 'IGNORE';	2256	if $SIG{CHLD} eq 'IGNORE';
2062		2257
2063	$SIG{PIPE} = sub { }	2258	$SIG{PIPE} = sub { }
2064	unless defined $SIG{PIPE};	2259	unless defined $SIG{PIPE};
2065		2260
		2261	=head1 RECOMMENDED/OPTIONAL MODULES
		2262
		2263	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and
		2264	it's built-in modules) are required to use it.
		2265
		2266	That does not mean that AnyEvent won't take advantage of some additional
		2267	modules if they are installed.
		2268
		2269	This section epxlains which additional modules will be used, and how they
		2270	affect AnyEvent's operetion.
		2271
		2272	=over 4
		2273
		2274	=item L<Async::Interrupt>
		2275
		2276	This slightly arcane module is used to implement fast signal handling: To
		2277	my knowledge, there is no way to do completely race-free and quick
		2278	signal handling in pure perl. To ensure that signals still get
		2279	delivered, AnyEvent will start an interval timer to wake up perl (and
		2280	catch the signals) with some delay (default is 10 seconds, look for
		2281	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
		2282
		2283	If this module is available, then it will be used to implement signal
		2284	catching, which means that signals will not be delayed, and the event loop
		2285	will not be interrupted regularly, which is more efficient (And good for
		2286	battery life on laptops).
		2287
		2288	This affects not just the pure-perl event loop, but also other event loops
		2289	that have no signal handling on their own (e.g. Glib, Tk, Qt).
		2290
		2291	Some event loops (POE, Event, Event::Lib) offer signal watchers natively,
		2292	and either employ their own workarounds (POE) or use AnyEvent's workaround
		2293	(using C<$AnyEvent::MAX_SIGNAL_LATENCY>). Installing L<Async::Interrupt>
		2294	does nothing for those backends.
		2295
		2296	=item L<EV>
		2297
		2298	This module isn't really "optional", as it is simply one of the backend
		2299	event loops that AnyEvent can use. However, it is simply the best event
		2300	loop available in terms of features, speed and stability: It supports
		2301	the AnyEvent API optimally, implements all the watcher types in XS, does
		2302	automatic timer adjustments even when no monotonic clock is available,
		2303	can take avdantage of advanced kernel interfaces such as C<epoll> and
		2304	C<kqueue>, and is the fastest backend I<by far>. You can even embed
		2305	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
		2306
		2307	=item L<Guard>
		2308
		2309	The guard module, when used, will be used to implement
		2310	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
		2311	lot less memory), but otherwise doesn't affect guard operation much. It is
		2312	purely used for performance.
		2313
		2314	=item L<JSON> and L<JSON::XS>
		2315
		2316	This module is required when you want to read or write JSON data via
		2317	L<AnyEvent::Handle>. It is also written in pure-perl, but can take
		2318	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
		2319
		2320	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
		2321	installed.
		2322
		2323	=item L<Net::SSLeay>
		2324
		2325	Implementing TLS/SSL in Perl is certainly interesting, but not very
		2326	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
		2327	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.
		2328
		2329	=item L<Time::HiRes>
		2330
		2331	This module is part of perl since release 5.008. It will be used when the
		2332	chosen event library does not come with a timing source on it's own. The
		2333	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to
		2334	try to use a monotonic clock for timing stability.
		2335
		2336	=back
		2337
		2338
2066	=head1 FORK	2339	=head1 FORK
2067		2340
2068	Most event libraries are not fork-safe. The ones who are usually are	2341	Most event libraries are not fork-safe. The ones who are usually are
2069	because they rely on inefficient but fork-safe C<select> or C<poll>	2342	because they rely on inefficient but fork-safe C<select> or C<poll>
2070	calls. Only L<EV> is fully fork-aware.	2343	calls. Only L<EV> is fully fork-aware.
2071		2344
2072	If you have to fork, you must either do so I<before> creating your first	2345	If you have to fork, you must either do so I<before> creating your first
2073	watcher OR you must not use AnyEvent at all in the child.	2346	watcher OR you must not use AnyEvent at all in the child OR you must do
		2347	something completely out of the scope of AnyEvent.
2074		2348
2075		2349
2076	=head1 SECURITY CONSIDERATIONS	2350	=head1 SECURITY CONSIDERATIONS
2077		2351
2078	AnyEvent can be forced to load any event model via	2352	AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.230 by root, Wed Jul 8 05:55:17 2009 UTC vs. Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.230 by root, Wed Jul 8 05:55:17 2009 UTC vs.
Revision 1.248 by root, Sat Jul 18 22:27:10 2009 UTC