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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.236 by root, Fri Jul 10 22:35:27 2009 UTC vs.
Revision 1.277 by root, Sun Aug 9 13:27:23 2009 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - provide framework for multiple event loops	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt
6	event loops.	6	and POE are various supported event loops/environments.
7		7
8	=head1 SYNOPSIS	8	=head1 SYNOPSIS
9		9
10	use AnyEvent;	10	use AnyEvent;
11		11
40	=head1 INTRODUCTION/TUTORIAL	40	=head1 INTRODUCTION/TUTORIAL
41		41
42	This manpage is mainly a reference manual. If you are interested	42	This manpage is mainly a reference manual. If you are interested
43	in a tutorial or some gentle introduction, have a look at the	43	in a tutorial or some gentle introduction, have a look at the
44	L<AnyEvent::Intro> manpage.	44	L<AnyEvent::Intro> manpage.
		45
		46	=head1 SUPPORT
		47
		48	There is a mailinglist for discussing all things AnyEvent, and an IRC
		49	channel, too.
		50
		51	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software
		52	Repository>, at L<http://anyevent.schmorp.de>, for more info.
45		53
46	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)	54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
47		55
48	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen	56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
49	nowadays. So what is different about AnyEvent?	57	nowadays. So what is different about AnyEvent?
…		…
173	my variables are only visible after the statement in which they are	181	my variables are only visible after the statement in which they are
174	declared.	182	declared.
175		183
176	=head2 I/O WATCHERS	184	=head2 I/O WATCHERS
177		185
		186	$w = AnyEvent->io (
		187	fh => <filehandle_or_fileno>,
		188	poll => <"r" or "w">,
		189	cb => <callback>,
		190	);
		191
178	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	192	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
179	with the following mandatory key-value pairs as arguments:	193	with the following mandatory key-value pairs as arguments:
180		194
181	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch	195	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
182	for events (AnyEvent might or might not keep a reference to this file	196	for events (AnyEvent might or might not keep a reference to this file
…		…
211	undef $w;	225	undef $w;
212	});	226	});
213		227
214	=head2 TIME WATCHERS	228	=head2 TIME WATCHERS
215		229
		230	$w = AnyEvent->timer (after => <seconds>, cb => <callback>);
		231
		232	$w = AnyEvent->timer (
		233	after => <fractional_seconds>,
		234	interval => <fractional_seconds>,
		235	cb => <callback>,
		236	);
		237
216	You can create a time watcher by calling the C<< AnyEvent->timer >>	238	You can create a time watcher by calling the C<< AnyEvent->timer >>
217	method with the following mandatory arguments:	239	method with the following mandatory arguments:
218		240
219	C<after> specifies after how many seconds (fractional values are	241	C<after> specifies after how many seconds (fractional values are
220	supported) the callback should be invoked. C<cb> is the callback to invoke	242	supported) the callback should be invoked. C<cb> is the callback to invoke
…		…
347		369
348	=back	370	=back
349		371
350	=head2 SIGNAL WATCHERS	372	=head2 SIGNAL WATCHERS
351		373
		374	$w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>);
		375
352	You can watch for signals using a signal watcher, C<signal> is the signal	376	You can watch for signals using a signal watcher, C<signal> is the signal
353	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl	377	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl
354	callback to be invoked whenever a signal occurs.	378	callback to be invoked whenever a signal occurs.
355		379
356	Although the callback might get passed parameters, their value and	380	Although the callback might get passed parameters, their value and
…		…
361	invocation, and callback invocation will be synchronous. Synchronous means	385	invocation, and callback invocation will be synchronous. Synchronous means
362	that it might take a while until the signal gets handled by the process,	386	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.	387	but it is guaranteed not to interrupt any other callbacks.
364		388
365	The main advantage of using these watchers is that you can share a signal	389	The main advantage of using these watchers is that you can share a signal
366	between multiple watchers.	390	between multiple watchers, and AnyEvent will ensure that signals will not
		391	interrupt your program at bad times.
367		392
368	This watcher might use C<%SIG>, so programs overwriting those signals	393	This watcher might use C<%SIG> (depending on the event loop used),
369	directly will likely not work correctly.	394	so programs overwriting those signals directly will likely not work
		395	correctly.
370		396
371	Example: exit on SIGINT	397	Example: exit on SIGINT
372		398
373	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	399	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
374		400
		401	=head3 Signal Races, Delays and Workarounds
		402
		403	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
		404	callbacks to signals in a generic way, which is a pity, as you cannot
		405	do race-free signal handling in perl, requiring C libraries for
		406	this. AnyEvent will try to do it's best, which means in some cases,
		407	signals will be delayed. The maximum time a signal might be delayed is
		408	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This
		409	variable can be changed only before the first signal watcher is created,
		410	and should be left alone otherwise. This variable determines how often
		411	AnyEvent polls for signals (in case a wake-up was missed). Higher values
		412	will cause fewer spurious wake-ups, which is better for power and CPU
		413	saving.
		414
		415	All these problems can be avoided by installing the optional
		416	L<Async::Interrupt> module, which works with most event loops. It will not
		417	work with inherently broken event loops such as L<Event> or L<Event::Lib>
		418	(and not with L<POE> currently, as POE does it's own workaround with
		419	one-second latency). For those, you just have to suffer the delays.
		420
375	=head2 CHILD PROCESS WATCHERS	421	=head2 CHILD PROCESS WATCHERS
376		422
		423	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
		424
377	You can also watch on a child process exit and catch its exit status.	425	You can also watch on a child process exit and catch its exit status.
378		426
379	The child process is specified by the C<pid> argument (if set to C<0>, it	427	The child process is specified by the C<pid> argument (one some backends,
380	watches for any child process exit). The watcher will triggered only when	428	using C<0> watches for any child process exit, on others this will
381	the child process has finished and an exit status is available, not on	429	croak). The watcher will be triggered only when the child process has
382	any trace events (stopped/continued).	430	finished and an exit status is available, not on any trace events
		431	(stopped/continued).
383		432
384	The callback will be called with the pid and exit status (as returned by	433	The callback will be called with the pid and exit status (as returned by
385	waitpid), so unlike other watcher types, you I<can> rely on child watcher	434	waitpid), so unlike other watcher types, you I<can> rely on child watcher
386	callback arguments.	435	callback arguments.
387		436
…		…
403		452
404	This means you cannot create a child watcher as the very first	453	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	454	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	455	watcher before you C<fork> the child (alternatively, you can call
407	C<AnyEvent::detect>).	456	C<AnyEvent::detect>).
		457
		458	As most event loops do not support waiting for child events, they will be
		459	emulated by AnyEvent in most cases, in which the latency and race problems
		460	mentioned in the description of signal watchers apply.
408		461
409	Example: fork a process and wait for it	462	Example: fork a process and wait for it
410		463
411	my $done = AnyEvent->condvar;	464	my $done = AnyEvent->condvar;
412		465
…		…
424	# do something else, then wait for process exit	477	# do something else, then wait for process exit
425	$done->recv;	478	$done->recv;
426		479
427	=head2 IDLE WATCHERS	480	=head2 IDLE WATCHERS
428		481
		482	$w = AnyEvent->idle (cb => <callback>);
		483
429	Sometimes there is a need to do something, but it is not so important	484	Sometimes there is a need to do something, but it is not so important
430	to do it instantly, but only when there is nothing better to do. This	485	to do it instantly, but only when there is nothing better to do. This
431	"nothing better to do" is usually defined to be "no other events need	486	"nothing better to do" is usually defined to be "no other events need
432	attention by the event loop".	487	attention by the event loop".
433		488
…		…
459	});	514	});
460	});	515	});
461		516
462	=head2 CONDITION VARIABLES	517	=head2 CONDITION VARIABLES
463		518
		519	$cv = AnyEvent->condvar;
		520
		521	$cv->send (<list>);
		522	my @res = $cv->recv;
		523
464	If you are familiar with some event loops you will know that all of them	524	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	525	require you to run some blocking "loop", "run" or similar function that
466	will actively watch for new events and call your callbacks.	526	will actively watch for new events and call your callbacks.
467		527
468	AnyEvent is different, it expects somebody else to run the event loop and	528	AnyEvent is slightly different: it expects somebody else to run the event
469	will only block when necessary (usually when told by the user).	529	loop and will only block when necessary (usually when told by the user).
470		530
471	The instrument to do that is called a "condition variable", so called	531	The instrument to do that is called a "condition variable", so called
472	because they represent a condition that must become true.	532	because they represent a condition that must become true.
473		533
		534	Now is probably a good time to look at the examples further below.
		535
474	Condition variables can be created by calling the C<< AnyEvent->condvar	536	Condition variables can be created by calling the C<< AnyEvent->condvar
475	>> method, usually without arguments. The only argument pair allowed is	537	>> 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	538	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	539	becomes true, with the condition variable as the first argument (but not
479	the results).	540	the results).
480		541
481	After creation, the condition variable is "false" until it becomes "true"	542	After creation, the condition variable is "false" until it becomes "true"
…		…
486	Condition variables are similar to callbacks, except that you can	547	Condition variables are similar to callbacks, except that you can
487	optionally wait for them. They can also be called merge points - points	548	optionally wait for them. They can also be called merge points - points
488	in time where multiple outstanding events have been processed. And yet	549	in time where multiple outstanding events have been processed. And yet
489	another way to call them is transactions - each condition variable can be	550	another way to call them is transactions - each condition variable can be
490	used to represent a transaction, which finishes at some point and delivers	551	used to represent a transaction, which finishes at some point and delivers
491	a result.	552	a result. And yet some people know them as "futures" - a promise to
		553	compute/deliver something that you can wait for.
492		554
493	Condition variables are very useful to signal that something has finished,	555	Condition variables are very useful to signal that something has finished,
494	for example, if you write a module that does asynchronous http requests,	556	for example, if you write a module that does asynchronous http requests,
495	then a condition variable would be the ideal candidate to signal the	557	then a condition variable would be the ideal candidate to signal the
496	availability of results. The user can either act when the callback is	558	availability of results. The user can either act when the callback is
…		…
530	after => 1,	592	after => 1,
531	cb => sub { $result_ready->send },	593	cb => sub { $result_ready->send },
532	);	594	);
533		595
534	# this "blocks" (while handling events) till the callback	596	# this "blocks" (while handling events) till the callback
535	# calls send	597	# calls -<send
536	$result_ready->recv;	598	$result_ready->recv;
537		599
538	Example: wait for a timer, but take advantage of the fact that	600	Example: wait for a timer, but take advantage of the fact that condition
539	condition variables are also code references.	601	variables are also callable directly.
540		602
541	my $done = AnyEvent->condvar;	603	my $done = AnyEvent->condvar;
542	my $delay = AnyEvent->timer (after => 5, cb => $done);	604	my $delay = AnyEvent->timer (after => 5, cb => $done);
543	$done->recv;	605	$done->recv;
544		606
…		…
550		612
551	...	613	...
552		614
553	my @info = $couchdb->info->recv;	615	my @info = $couchdb->info->recv;
554		616
555	And this is how you would just ste a callback to be called whenever the	617	And this is how you would just set a callback to be called whenever the
556	results are available:	618	results are available:
557		619
558	$couchdb->info->cb (sub {	620	$couchdb->info->cb (sub {
559	my @info = $_[0]->recv;	621	my @info = $_[0]->recv;
560	});	622	});
…		…
578	immediately from within send.	640	immediately from within send.
579		641
580	Any arguments passed to the C<send> call will be returned by all	642	Any arguments passed to the C<send> call will be returned by all
581	future C<< ->recv >> calls.	643	future C<< ->recv >> calls.
582		644
583	Condition variables are overloaded so one can call them directly	645	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	646	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	647	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		648
592	=item $cv->croak ($error)	649	=item $cv->croak ($error)
593		650
594	Similar to send, but causes all call's to C<< ->recv >> to invoke	651	Similar to send, but causes all call's to C<< ->recv >> to invoke
595	C<Carp::croak> with the given error message/object/scalar.	652	C<Carp::croak> with the given error message/object/scalar.
596		653
597	This can be used to signal any errors to the condition variable	654	This can be used to signal any errors to the condition variable
598	user/consumer.	655	user/consumer. Doing it this way instead of calling C<croak> directly
		656	delays the error detetcion, but has the overwhelmign advantage that it
		657	diagnoses the error at the place where the result is expected, and not
		658	deep in some event clalback without connection to the actual code causing
		659	the problem.
599		660
600	=item $cv->begin ([group callback])	661	=item $cv->begin ([group callback])
601		662
602	=item $cv->end	663	=item $cv->end
603		664
…		…
699	function will call C<croak>.	760	function will call C<croak>.
700		761
701	In list context, all parameters passed to C<send> will be returned,	762	In list context, all parameters passed to C<send> will be returned,
702	in scalar context only the first one will be returned.	763	in scalar context only the first one will be returned.
703		764
		765	Note that doing a blocking wait in a callback is not supported by any
		766	event loop, that is, recursive invocation of a blocking C<< ->recv
		767	>> is not allowed, and the C<recv> call will C<croak> if such a
		768	condition is detected. This condition can be slightly loosened by using
		769	L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from
		770	any thread that doesn't run the event loop itself.
		771
704	Not all event models support a blocking wait - some die in that case	772	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	773	(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	774	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	775	caller decide whether the call will block or not (for example, by coupling
708	condition variables with some kind of request results and supporting	776	condition variables with some kind of request results and supporting
709	callbacks so the caller knows that getting the result will not block,	777	callbacks so the caller knows that getting the result will not block,
710	while still supporting blocking waits if the caller so desires).	778	while still supporting blocking waits if the caller so desires).
711		779
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	780	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	781	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	782	time). This will work even when the event loop does not support blocking
726	waits otherwise.	783	waits otherwise.
727		784
…		…
733	=item $cb = $cv->cb ($cb->($cv))	790	=item $cb = $cv->cb ($cb->($cv))
734		791
735	This is a mutator function that returns the callback set and optionally	792	This is a mutator function that returns the callback set and optionally
736	replaces it before doing so.	793	replaces it before doing so.
737		794
738	The callback will be called when the condition becomes "true", i.e. when	795	The callback will be called when the condition becomes (or already was)
739	C<send> or C<croak> are called, with the only argument being the condition	796	"true", i.e. when C<send> or C<croak> are called (or were called), with
740	variable itself. Calling C<recv> inside the callback or at any later time	797	the only argument being the condition variable itself. Calling C<recv>
741	is guaranteed not to block.	798	inside the callback or at any later time is guaranteed not to block.
742		799
743	=back	800	=back
744		801
745	=head1 SUPPORTED EVENT LOOPS/BACKENDS	802	=head1 SUPPORTED EVENT LOOPS/BACKENDS
746		803
…		…
749	=over 4	806	=over 4
750		807
751	=item Backends that are autoprobed when no other event loop can be found.	808	=item Backends that are autoprobed when no other event loop can be found.
752		809
753	EV is the preferred backend when no other event loop seems to be in	810	EV is the preferred backend when no other event loop seems to be in
754	use. If EV is not installed, then AnyEvent will try Event, and, failing	811	use. If EV is not installed, then AnyEvent will fall back to its own
755	that, will fall back to its own pure-perl implementation, which is	812	pure-perl implementation, which is available everywhere as it comes with
756	available everywhere as it comes with AnyEvent itself.	813	AnyEvent itself.
757		814
758	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	815	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
759	AnyEvent::Impl::Event based on Event, very stable, few glitches.
760	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	816	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
761		817
762	=item Backends that are transparently being picked up when they are used.	818	=item Backends that are transparently being picked up when they are used.
763		819
764	These will be used when they are currently loaded when the first watcher	820	These will be used when they are currently loaded when the first watcher
765	is created, in which case it is assumed that the application is using	821	is created, in which case it is assumed that the application is using
766	them. This means that AnyEvent will automatically pick the right backend	822	them. This means that AnyEvent will automatically pick the right backend
767	when the main program loads an event module before anything starts to	823	when the main program loads an event module before anything starts to
768	create watchers. Nothing special needs to be done by the main program.	824	create watchers. Nothing special needs to be done by the main program.
769		825
		826	AnyEvent::Impl::Event based on Event, very stable, few glitches.
770	AnyEvent::Impl::Glib based on Glib, slow but very stable.	827	AnyEvent::Impl::Glib based on Glib, slow but very stable.
771	AnyEvent::Impl::Tk based on Tk, very broken.	828	AnyEvent::Impl::Tk based on Tk, very broken.
772	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	829	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
773	AnyEvent::Impl::POE based on POE, very slow, some limitations.	830	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		831	AnyEvent::Impl::Irssi used when running within irssi.
774		832
775	=item Backends with special needs.	833	=item Backends with special needs.
776		834
777	Qt requires the Qt::Application to be instantiated first, but will	835	Qt requires the Qt::Application to be instantiated first, but will
778	otherwise be picked up automatically. As long as the main program	836	otherwise be picked up automatically. As long as the main program
…		…
852	event module detection too early, for example, L<AnyEvent::AIO> creates	910	event module detection too early, for example, L<AnyEvent::AIO> creates
853	and installs the global L<IO::AIO> watcher in a C<post_detect> block to	911	and installs the global L<IO::AIO> watcher in a C<post_detect> block to
854	avoid autodetecting the event module at load time.	912	avoid autodetecting the event module at load time.
855		913
856	If called in scalar or list context, then it creates and returns an object	914	If called in scalar or list context, then it creates and returns an object
857	that automatically removes the callback again when it is destroyed. See	915	that automatically removes the callback again when it is destroyed (or
		916	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for
858	L<Coro::BDB> for a case where this is useful.	917	a case where this is useful.
		918
		919	Example: Create a watcher for the IO::AIO module and store it in
		920	C<$WATCHER>. Only do so after the event loop is initialised, though.
		921
		922	our WATCHER;
		923
		924	my $guard = AnyEvent::post_detect {
		925	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);
		926	};
		927
		928	# the \|\|= is important in case post_detect immediately runs the block,
		929	# as to not clobber the newly-created watcher. assigning both watcher and
		930	# post_detect guard to the same variable has the advantage of users being
		931	# able to just C<undef $WATCHER> if the watcher causes them grief.
		932
		933	$WATCHER \|\|= $guard;
859		934
860	=item @AnyEvent::post_detect	935	=item @AnyEvent::post_detect
861		936
862	If there are any code references in this array (you can C<push> to it	937	If there are any code references in this array (you can C<push> to it
863	before or after loading AnyEvent), then they will called directly after	938	before or after loading AnyEvent), then they will called directly after
…		…
1028		1103
1029	=cut	1104	=cut
1030		1105
1031	package AnyEvent;	1106	package AnyEvent;
1032		1107
		1108	# basically a tuned-down version of common::sense
		1109	sub common_sense {
1033	no warnings;	1110	# no warnings
		1111	${^WARNING_BITS} ^= ${^WARNING_BITS};
1034	use strict qw(vars subs);	1112	# use strict vars subs
		1113	$^H \|= 0x00000600;
		1114	}
1035		1115
		1116	BEGIN { AnyEvent::common_sense }
		1117
1036	use Carp;	1118	use Carp ();
1037		1119
1038	our $VERSION = 4.82;	1120	our $VERSION = 4.92;
1039	our $MODEL;	1121	our $MODEL;
1040		1122
1041	our $AUTOLOAD;	1123	our $AUTOLOAD;
1042	our @ISA;	1124	our @ISA;
1043		1125
1044	our @REGISTRY;	1126	our @REGISTRY;
1045		1127
1046	our $WIN32;	1128	our $WIN32;
		1129
		1130	our $VERBOSE;
1047		1131
1048	BEGIN {	1132	BEGIN {
1049	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1133	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
1050	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1134	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";
1051		1135
1052	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1136	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1053	if ${^TAINT};	1137	if ${^TAINT};
1054	}
1055		1138
1056	our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1139	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
		1140
		1141	}
		1142
		1143	our $MAX_SIGNAL_LATENCY = 10;
1057		1144
1058	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1145	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
1059		1146
1060	{	1147	{
1061	my $idx;	1148	my $idx;
…		…
1063	for reverse split /\s,\s/,	1150	for reverse split /\s,\s/,
1064	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1151	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1065	}	1152	}
1066		1153
1067	my @models = (	1154	my @models = (
1068	[EV:: => AnyEvent::Impl::EV::],	1155	[EV:: => AnyEvent::Impl::EV:: , 1],
1069	[Event:: => AnyEvent::Impl::Event::],
1070	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1156	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1071	# everything below here will not be autoprobed	1157	# everything below here will not (normally) be autoprobed
1072	# as the pureperl backend should work everywhere	1158	# as the pureperl backend should work everywhere
1073	# and is usually faster	1159	# and is usually faster
		1160	[Event:: => AnyEvent::Impl::Event::, 1],
1074	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1161	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1075	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1162	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1163	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1076	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1164	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
		1165	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1077	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1166	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1078	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1079	[Wx:: => AnyEvent::Impl::POE::],	1167	[Wx:: => AnyEvent::Impl::POE::],
1080	[Prima:: => AnyEvent::Impl::POE::],	1168	[Prima:: => AnyEvent::Impl::POE::],
1081	# IO::Async is just too broken - we would need workarounds for its	1169	# IO::Async is just too broken - we would need workarounds for its
1082	# byzantine signal and broken child handling, among others.	1170	# byzantine signal and broken child handling, among others.
1083	# IO::Async is rather hard to detect, as it doesn't have any	1171	# IO::Async is rather hard to detect, as it doesn't have any
1084	# obvious default class.	1172	# obvious default class.
1085	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1173	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1086	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1174	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1087	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1175	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1176	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1088	);	1177	);
1089		1178
1090	our %method = map +($_ => 1),	1179	our %method = map +($_ => 1),
1091	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1180	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1092		1181
…		…
1096	my ($cb) = @_;	1185	my ($cb) = @_;
1097		1186
1098	if ($MODEL) {	1187	if ($MODEL) {
1099	$cb->();	1188	$cb->();
1100		1189
1101	1	1190	undef
1102	} else {	1191	} else {
1103	push @post_detect, $cb;	1192	push @post_detect, $cb;
1104		1193
1105	defined wantarray	1194	defined wantarray
1106	? bless \$cb, "AnyEvent::Util::postdetect"	1195	? bless \$cb, "AnyEvent::Util::postdetect"
…		…
1112	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1201	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1113	}	1202	}
1114		1203
1115	sub detect() {	1204	sub detect() {
1116	unless ($MODEL) {	1205	unless ($MODEL) {
1117	no strict 'refs';
1118	local $SIG{__DIE__};	1206	local $SIG{__DIE__};
1119		1207
1120	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1208	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
1121	my $model = "AnyEvent::Impl::$1";	1209	my $model = "AnyEvent::Impl::$1";
1122	if (eval "require $model") {	1210	if (eval "require $model") {
1123	$MODEL = $model;	1211	$MODEL = $model;
1124	warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1;	1212	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1125	} else {	1213	} else {
1126	warn "AnyEvent: unable to load model '$model' (from \$PERL_ANYEVENT_MODEL):\n$@" if $verbose;	1214	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
1127	}	1215	}
1128	}	1216	}
1129		1217
1130	# check for already loaded models	1218	# check for already loaded models
1131	unless ($MODEL) {	1219	unless ($MODEL) {
1132	for (@REGISTRY, @models) {	1220	for (@REGISTRY, @models) {
1133	my ($package, $model) = @$_;	1221	my ($package, $model) = @$_;
1134	if (${"$package\::VERSION"} > 0) {	1222	if (${"$package\::VERSION"} > 0) {
1135	if (eval "require $model") {	1223	if (eval "require $model") {
1136	$MODEL = $model;	1224	$MODEL = $model;
1137	warn "AnyEvent: autodetected model '$model', using it.\n" if $verbose > 1;	1225	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1138	last;	1226	last;
1139	}	1227	}
1140	}	1228	}
1141	}	1229	}
1142		1230
1143	unless ($MODEL) {	1231	unless ($MODEL) {
1144	# try to load a model	1232	# try to autoload a model
1145
1146	for (@REGISTRY, @models) {	1233	for (@REGISTRY, @models) {
1147	my ($package, $model) = @$_;	1234	my ($package, $model, $autoload) = @$_;
		1235	if (
		1236	$autoload
1148	if (eval "require $package"	1237	and eval "require $package"
1149	and ${"$package\::VERSION"} > 0	1238	and ${"$package\::VERSION"} > 0
1150	and eval "require $model") {	1239	and eval "require $model"
		1240	) {
1151	$MODEL = $model;	1241	$MODEL = $model;
1152	warn "AnyEvent: autoprobed model '$model', using it.\n" if $verbose > 1;	1242	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1153	last;	1243	last;
1154	}	1244	}
1155	}	1245	}
1156		1246
1157	$MODEL	1247	$MODEL
…		…
1173		1263
1174	sub AUTOLOAD {	1264	sub AUTOLOAD {
1175	(my $func = $AUTOLOAD) =~ s/.*://;	1265	(my $func = $AUTOLOAD) =~ s/.*://;
1176		1266
1177	$method{$func}	1267	$method{$func}
1178	or croak "$func: not a valid method for AnyEvent objects";	1268	or Carp::croak "$func: not a valid method for AnyEvent objects";
1179		1269
1180	detect unless $MODEL;	1270	detect unless $MODEL;
1181		1271
1182	my $class = shift;	1272	my $class = shift;
1183	$class->$func (@_);	1273	$class->$func (@_);
…		…
1188	# allow only one watcher per fd, so we dup it to get a different one).	1278	# allow only one watcher per fd, so we dup it to get a different one).
1189	sub _dupfh($$;$$) {	1279	sub _dupfh($$;$$) {
1190	my ($poll, $fh, $r, $w) = @_;	1280	my ($poll, $fh, $r, $w) = @_;
1191		1281
1192	# cygwin requires the fh mode to be matching, unix doesn't	1282	# cygwin requires the fh mode to be matching, unix doesn't
1193	my ($rw, $mode) = $poll eq "r" ? ($r, "<") : ($w, ">");	1283	my ($rw, $mode) = $poll eq "r" ? ($r, "<&") : ($w, ">&");
1194		1284
1195	open my $fh2, "$mode&", $fh	1285	open my $fh2, $mode, $fh
1196	or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,";	1286	or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,";
1197		1287
1198	# we assume CLOEXEC is already set by perl in all important cases	1288	# we assume CLOEXEC is already set by perl in all important cases
1199		1289
1200	($fh2, $rw)	1290	($fh2, $rw)
1201	}	1291	}
1202		1292
		1293	#############################################################################
		1294	# "new" API, currently only emulation of it
		1295	#############################################################################
		1296
		1297	package AE;
		1298
		1299	our $VERSION = $AnyEvent::VERSION;
		1300
		1301	sub io($$$) {
		1302	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1303	}
		1304
		1305	sub timer($$$) {
		1306	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1307	}
		1308
		1309	sub signal($$) {
		1310	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1311	}
		1312
		1313	sub child($$) {
		1314	AnyEvent->child (pid => $_[0], cb => $_[1])
		1315	}
		1316
		1317	sub idle($) {
		1318	AnyEvent->idle (cb => $_[0])
		1319	}
		1320
		1321	sub cv(;&) {
		1322	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1323	}
		1324
		1325	sub now() {
		1326	AnyEvent->now
		1327	}
		1328
		1329	sub now_update() {
		1330	AnyEvent->now_update
		1331	}
		1332
		1333	sub time() {
		1334	AnyEvent->time
		1335	}
		1336
1203	package AnyEvent::Base;	1337	package AnyEvent::Base;
1204		1338
1205	# default implementations for many methods	1339	# default implementations for many methods
1206		1340
1207	BEGIN {	1341	sub _time {
		1342	# probe for availability of Time::HiRes
1208	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1343	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
		1344	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1209	*_time = \&Time::HiRes::time;	1345	*_time = \&Time::HiRes::time;
1210	# if (eval "use POSIX (); (POSIX::times())...	1346	# if (eval "use POSIX (); (POSIX::times())...
1211	} else {	1347	} else {
		1348	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1212	*_time = sub { time }; # epic fail	1349	*_time = sub { time }; # epic fail
1213	}	1350	}
		1351
		1352	&_time
1214	}	1353	}
1215		1354
1216	sub time { _time }	1355	sub time { _time }
1217	sub now { _time }	1356	sub now { _time }
1218	sub now_update { }	1357	sub now_update { }
…		…
1223	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1362	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
1224	}	1363	}
1225		1364
1226	# default implementation for ->signal	1365	# default implementation for ->signal
1227		1366
		1367	our $HAVE_ASYNC_INTERRUPT;
		1368
		1369	sub _have_async_interrupt() {
		1370	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1371	&& eval "use Async::Interrupt 1.0 (); 1")
		1372	unless defined $HAVE_ASYNC_INTERRUPT;
		1373
		1374	$HAVE_ASYNC_INTERRUPT
		1375	}
		1376
1228	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1377	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
		1378	our (%SIG_ASY, %SIG_ASY_W);
		1379	our ($SIG_COUNT, $SIG_TW);
1229		1380
1230	sub _signal_exec {	1381	sub _signal_exec {
		1382	$HAVE_ASYNC_INTERRUPT
		1383	? $SIGPIPE_R->drain
1231	sysread $SIGPIPE_R, my $dummy, 4;	1384	: sysread $SIGPIPE_R, my $dummy, 9;
1232		1385
1233	while (%SIG_EV) {	1386	while (%SIG_EV) {
1234	for (keys %SIG_EV) {	1387	for (keys %SIG_EV) {
1235	delete $SIG_EV{$_};	1388	delete $SIG_EV{$_};
1236	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1389	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1237	}	1390	}
1238	}	1391	}
1239	}	1392	}
1240		1393
		1394	# install a dummy wakeup watcher to reduce signal catching latency
		1395	sub _sig_add() {
		1396	unless ($SIG_COUNT++) {
		1397	# try to align timer on a full-second boundary, if possible
		1398	my $NOW = AE::now;
		1399
		1400	$SIG_TW = AE::timer
		1401	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
		1402	$MAX_SIGNAL_LATENCY,
		1403	sub { } # just for the PERL_ASYNC_CHECK
		1404	;
		1405	}
		1406	}
		1407
		1408	sub _sig_del {
		1409	undef $SIG_TW
		1410	unless --$SIG_COUNT;
		1411	}
		1412
		1413	our $_sig_name_init; $_sig_name_init = sub {
		1414	eval q{ # poor man's autoloading
		1415	undef $_sig_name_init;
		1416
		1417	if (_have_async_interrupt) {
		1418	*sig2num = \&Async::Interrupt::sig2num;
		1419	*sig2name = \&Async::Interrupt::sig2name;
		1420	} else {
		1421	require Config;
		1422
		1423	my %signame2num;
		1424	@signame2num{ split ' ', $Config::Config{sig_name} }
		1425	= split ' ', $Config::Config{sig_num};
		1426
		1427	my @signum2name;
		1428	@signum2name[values %signame2num] = keys %signame2num;
		1429
		1430	*sig2num = sub($) {
		1431	$_[0] > 0 ? shift : $signame2num{+shift}
		1432	};
		1433	*sig2name = sub ($) {
		1434	$_[0] > 0 ? $signum2name[+shift] : shift
		1435	};
		1436	}
		1437	};
		1438	die if $@;
		1439	};
		1440
		1441	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1442	sub sig2name($) { &$_sig_name_init; &sig2name }
		1443
1241	sub signal {	1444	sub signal {
1242	my (undef, %arg) = @_;	1445	eval q{ # poor man's autoloading {}
		1446	# probe for availability of Async::Interrupt
		1447	if (_have_async_interrupt) {
		1448	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1243		1449
1244	unless ($SIGPIPE_R) {	1450	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1245	require Fcntl;	1451	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1246		1452
1247	if (AnyEvent::WIN32) {
1248	require AnyEvent::Util;
1249
1250	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1251	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1252	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1253	} else {	1453	} else {
		1454	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1455
		1456	require Fcntl;
		1457
		1458	if (AnyEvent::WIN32) {
		1459	require AnyEvent::Util;
		1460
		1461	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1462	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1463	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1464	} else {
1254	pipe $SIGPIPE_R, $SIGPIPE_W;	1465	pipe $SIGPIPE_R, $SIGPIPE_W;
1255	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;	1466	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1256	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case	1467	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1257		1468
1258	# not strictly required, as $^F is normally 2, but let's make sure...	1469	# not strictly required, as $^F is normally 2, but let's make sure...
1259	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1470	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1260	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1471	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1472	}
		1473
		1474	$SIGPIPE_R
		1475	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1476
		1477	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
1261	}	1478	}
1262		1479
1263	$SIGPIPE_R	1480	*signal = sub {
1264	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1481	my (undef, %arg) = @_;
1265		1482
1266	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1267	}
1268
1269	my $signal = uc $arg{signal}	1483	my $signal = uc $arg{signal}
1270	or Carp::croak "required option 'signal' is missing";	1484	or Carp::croak "required option 'signal' is missing";
1271		1485
		1486	if ($HAVE_ASYNC_INTERRUPT) {
		1487	# async::interrupt
		1488
		1489	$signal = sig2num $signal;
1272	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1490	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1491
		1492	$SIG_ASY{$signal} \|\|= new Async::Interrupt
		1493	cb => sub { undef $SIG_EV{$signal} },
		1494	signal => $signal,
		1495	pipe => [$SIGPIPE_R->filenos],
		1496	pipe_autodrain => 0,
		1497	;
		1498
		1499	} else {
		1500	# pure perl
		1501
		1502	# AE::Util has been loaded in signal
		1503	$signal = sig2name $signal;
		1504	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1505
1273	$SIG{$signal} \|\|= sub {	1506	$SIG{$signal} \|\|= sub {
1274	local $!;	1507	local $!;
1275	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1508	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1276	undef $SIG_EV{$signal};	1509	undef $SIG_EV{$signal};
		1510	};
		1511
		1512	# can't do signal processing without introducing races in pure perl,
		1513	# so limit the signal latency.
		1514	_sig_add;
		1515	}
		1516
		1517	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1518	};
		1519
		1520	*AnyEvent::Base::signal::DESTROY = sub {
		1521	my ($signal, $cb) = @{$_[0]};
		1522
		1523	_sig_del;
		1524
		1525	delete $SIG_CB{$signal}{$cb};
		1526
		1527	$HAVE_ASYNC_INTERRUPT
		1528	? delete $SIG_ASY{$signal}
		1529	: # delete doesn't work with older perls - they then
		1530	# print weird messages, or just unconditionally exit
		1531	# instead of getting the default action.
		1532	undef $SIG{$signal}
		1533	unless keys %{ $SIG_CB{$signal} };
		1534	};
1277	};	1535	};
1278		1536	die if $@;
1279	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"	1537	&signal
1280	}
1281
1282	sub AnyEvent::Base::signal::DESTROY {
1283	my ($signal, $cb) = @{$_[0]};
1284
1285	delete $SIG_CB{$signal}{$cb};
1286
1287	# delete doesn't work with older perls - they then
1288	# print weird messages, or just unconditionally exit
1289	# instead of getting the default action.
1290	undef $SIG{$signal} unless keys %{ $SIG_CB{$signal} };
1291	}	1538	}
1292		1539
1293	# default implementation for ->child	1540	# default implementation for ->child
1294		1541
1295	our %PID_CB;	1542	our %PID_CB;
1296	our $CHLD_W;	1543	our $CHLD_W;
1297	our $CHLD_DELAY_W;	1544	our $CHLD_DELAY_W;
1298	our $WNOHANG;	1545	our $WNOHANG;
1299		1546
		1547	sub _emit_childstatus($$) {
		1548	my (undef, $rpid, $rstatus) = @_;
		1549
		1550	$_->($rpid, $rstatus)
		1551	for values %{ $PID_CB{$rpid} \|\| {} },
		1552	values %{ $PID_CB{0} \|\| {} };
		1553	}
		1554
1300	sub _sigchld {	1555	sub _sigchld {
		1556	my $pid;
		1557
		1558	AnyEvent->_emit_childstatus ($pid, $?)
1301	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1559	while ($pid = waitpid -1, $WNOHANG) > 0;
1302	$_->($pid, $?) for (values %{ $PID_CB{$pid} \|\| {} }),
1303	(values %{ $PID_CB{0} \|\| {} });
1304	}
1305	}	1560	}
1306		1561
1307	sub child {	1562	sub child {
1308	my (undef, %arg) = @_;	1563	my (undef, %arg) = @_;
1309		1564
1310	defined (my $pid = $arg{pid} + 0)	1565	defined (my $pid = $arg{pid} + 0)
1311	or Carp::croak "required option 'pid' is missing";	1566	or Carp::croak "required option 'pid' is missing";
1312		1567
1313	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1568	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1314		1569
		1570	# WNOHANG is almost cetrainly 1 everywhere
		1571	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
		1572	? 1
1315	$WNOHANG \|\|= eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1573	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1316		1574
1317	unless ($CHLD_W) {	1575	unless ($CHLD_W) {
1318	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1576	$CHLD_W = AE::signal CHLD => \&_sigchld;
1319	# child could be a zombie already, so make at least one round	1577	# child could be a zombie already, so make at least one round
1320	&_sigchld;	1578	&_sigchld;
1321	}	1579	}
1322		1580
1323	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1581	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
…		…
1349	# never use more then 50% of the time for the idle watcher,	1607	# never use more then 50% of the time for the idle watcher,
1350	# within some limits	1608	# within some limits
1351	$w = 0.0001 if $w < 0.0001;	1609	$w = 0.0001 if $w < 0.0001;
1352	$w = 5 if $w > 5;	1610	$w = 5 if $w > 5;
1353		1611
1354	$w = AnyEvent->timer (after => $w, cb => $rcb);	1612	$w = AE::timer $w, 0, $rcb;
1355	} else {	1613	} else {
1356	# clean up...	1614	# clean up...
1357	undef $w;	1615	undef $w;
1358	undef $rcb;	1616	undef $rcb;
1359	}	1617	}
1360	};	1618	};
1361		1619
1362	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1620	$w = AE::timer 0.05, 0, $rcb;
1363		1621
1364	bless \\$cb, "AnyEvent::Base::idle"	1622	bless \\$cb, "AnyEvent::Base::idle"
1365	}	1623	}
1366		1624
1367	sub AnyEvent::Base::idle::DESTROY {	1625	sub AnyEvent::Base::idle::DESTROY {
…		…
1372		1630
1373	our @ISA = AnyEvent::CondVar::Base::;	1631	our @ISA = AnyEvent::CondVar::Base::;
1374		1632
1375	package AnyEvent::CondVar::Base;	1633	package AnyEvent::CondVar::Base;
1376		1634
1377	use overload	1635	#use overload
1378	'&{}' => sub { my $self = shift; sub { $self->send (@_) } },	1636	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },
1379	fallback => 1;	1637	# fallback => 1;
		1638
		1639	# save 300+ kilobytes by dirtily hardcoding overloading
		1640	${"AnyEvent::CondVar::Base::OVERLOAD"}{dummy}++; # Register with magic by touching.
		1641	*{'AnyEvent::CondVar::Base::()'} = sub { }; # "Make it findable via fetchmethod."
		1642	*{'AnyEvent::CondVar::Base::(&{}'} = sub { my $self = shift; sub { $self->send (@_) } }; # &{}
		1643	${'AnyEvent::CondVar::Base::()'} = 1; # fallback
		1644
		1645	our $WAITING;
1380		1646
1381	sub _send {	1647	sub _send {
1382	# nop	1648	# nop
1383	}	1649	}
1384		1650
…		…
1397	sub ready {	1663	sub ready {
1398	$_[0]{_ae_sent}	1664	$_[0]{_ae_sent}
1399	}	1665	}
1400		1666
1401	sub _wait {	1667	sub _wait {
		1668	$WAITING
		1669	and !$_[0]{_ae_sent}
		1670	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
		1671
		1672	local $WAITING = 1;
1402	AnyEvent->one_event while !$_[0]{_ae_sent};	1673	AnyEvent->one_event while !$_[0]{_ae_sent};
1403	}	1674	}
1404		1675
1405	sub recv {	1676	sub recv {
1406	$_[0]->_wait;	1677	$_[0]->_wait;
…		…
1408	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1679	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1409	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1680	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1410	}	1681	}
1411		1682
1412	sub cb {	1683	sub cb {
1413	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1684	my $cv = shift;
		1685
		1686	@_
		1687	and $cv->{_ae_cb} = shift
		1688	and $cv->{_ae_sent}
		1689	and (delete $cv->{_ae_cb})->($cv);
		1690
1414	$_[0]{_ae_cb}	1691	$cv->{_ae_cb}
1415	}	1692	}
1416		1693
1417	sub begin {	1694	sub begin {
1418	++$_[0]{_ae_counter};	1695	++$_[0]{_ae_counter};
1419	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1696	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1468	C<PERL_ANYEVENT_MODEL>.	1745	C<PERL_ANYEVENT_MODEL>.
1469		1746
1470	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	1747	When set to C<2> or higher, cause AnyEvent to report to STDERR which event
1471	model it chooses.	1748	model it chooses.
1472		1749
		1750	When set to C<8> or higher, then AnyEvent will report extra information on
		1751	which optional modules it loads and how it implements certain features.
		1752
1473	=item C<PERL_ANYEVENT_STRICT>	1753	=item C<PERL_ANYEVENT_STRICT>
1474		1754
1475	AnyEvent does not do much argument checking by default, as thorough	1755	AnyEvent does not do much argument checking by default, as thorough
1476	argument checking is very costly. Setting this variable to a true value	1756	argument checking is very costly. Setting this variable to a true value
1477	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly	1757	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly
1478	check the arguments passed to most method calls. If it finds any problems,	1758	check the arguments passed to most method calls. If it finds any problems,
1479	it will croak.	1759	it will croak.
1480		1760
1481	In other words, enables "strict" mode.	1761	In other words, enables "strict" mode.
1482		1762
1483	Unlike C<use strict>, it is definitely recommended to keep it off in	1763	Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense>
1484	production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while	1764	>>, it is definitely recommended to keep it off in production. Keeping
1485	developing programs can be very useful, however.	1765	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
		1766	can be very useful, however.
1486		1767
1487	=item C<PERL_ANYEVENT_MODEL>	1768	=item C<PERL_ANYEVENT_MODEL>
1488		1769
1489	This can be used to specify the event model to be used by AnyEvent, before	1770	This can be used to specify the event model to be used by AnyEvent, before
1490	auto detection and -probing kicks in. It must be a string consisting	1771	auto detection and -probing kicks in. It must be a string consisting
…		…
1552		1833
1553	When neither C<ca_file> nor C<ca_path> was specified during	1834	When neither C<ca_file> nor C<ca_path> was specified during
1554	L<AnyEvent::TLS> context creation, and either of these environment	1835	L<AnyEvent::TLS> context creation, and either of these environment
1555	variables exist, they will be used to specify CA certificate locations	1836	variables exist, they will be used to specify CA certificate locations
1556	instead of a system-dependent default.	1837	instead of a system-dependent default.
		1838
		1839	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
		1840
		1841	When these are set to C<1>, then the respective modules are not
		1842	loaded. Mostly good for testing AnyEvent itself.
1557		1843
1558	=back	1844	=back
1559		1845
1560	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE	1846	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE
1561		1847
…		…
2129	if $SIG{CHLD} eq 'IGNORE';	2415	if $SIG{CHLD} eq 'IGNORE';
2130		2416
2131	$SIG{PIPE} = sub { }	2417	$SIG{PIPE} = sub { }
2132	unless defined $SIG{PIPE};	2418	unless defined $SIG{PIPE};
2133		2419
		2420	=head1 RECOMMENDED/OPTIONAL MODULES
		2421
		2422	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and
		2423	it's built-in modules) are required to use it.
		2424
		2425	That does not mean that AnyEvent won't take advantage of some additional
		2426	modules if they are installed.
		2427
		2428	This section epxlains which additional modules will be used, and how they
		2429	affect AnyEvent's operetion.
		2430
		2431	=over 4
		2432
		2433	=item L<Async::Interrupt>
		2434
		2435	This slightly arcane module is used to implement fast signal handling: To
		2436	my knowledge, there is no way to do completely race-free and quick
		2437	signal handling in pure perl. To ensure that signals still get
		2438	delivered, AnyEvent will start an interval timer to wake up perl (and
		2439	catch the signals) with some delay (default is 10 seconds, look for
		2440	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
		2441
		2442	If this module is available, then it will be used to implement signal
		2443	catching, which means that signals will not be delayed, and the event loop
		2444	will not be interrupted regularly, which is more efficient (And good for
		2445	battery life on laptops).
		2446
		2447	This affects not just the pure-perl event loop, but also other event loops
		2448	that have no signal handling on their own (e.g. Glib, Tk, Qt).
		2449
		2450	Some event loops (POE, Event, Event::Lib) offer signal watchers natively,
		2451	and either employ their own workarounds (POE) or use AnyEvent's workaround
		2452	(using C<$AnyEvent::MAX_SIGNAL_LATENCY>). Installing L<Async::Interrupt>
		2453	does nothing for those backends.
		2454
		2455	=item L<EV>
		2456
		2457	This module isn't really "optional", as it is simply one of the backend
		2458	event loops that AnyEvent can use. However, it is simply the best event
		2459	loop available in terms of features, speed and stability: It supports
		2460	the AnyEvent API optimally, implements all the watcher types in XS, does
		2461	automatic timer adjustments even when no monotonic clock is available,
		2462	can take avdantage of advanced kernel interfaces such as C<epoll> and
		2463	C<kqueue>, and is the fastest backend I<by far>. You can even embed
		2464	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
		2465
		2466	=item L<Guard>
		2467
		2468	The guard module, when used, will be used to implement
		2469	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
		2470	lot less memory), but otherwise doesn't affect guard operation much. It is
		2471	purely used for performance.
		2472
		2473	=item L<JSON> and L<JSON::XS>
		2474
		2475	This module is required when you want to read or write JSON data via
		2476	L<AnyEvent::Handle>. It is also written in pure-perl, but can take
		2477	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
		2478
		2479	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
		2480	installed.
		2481
		2482	=item L<Net::SSLeay>
		2483
		2484	Implementing TLS/SSL in Perl is certainly interesting, but not very
		2485	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
		2486	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.
		2487
		2488	=item L<Time::HiRes>
		2489
		2490	This module is part of perl since release 5.008. It will be used when the
		2491	chosen event library does not come with a timing source on it's own. The
		2492	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to
		2493	try to use a monotonic clock for timing stability.
		2494
		2495	=back
		2496
		2497
2134	=head1 FORK	2498	=head1 FORK
2135		2499
2136	Most event libraries are not fork-safe. The ones who are usually are	2500	Most event libraries are not fork-safe. The ones who are usually are
2137	because they rely on inefficient but fork-safe C<select> or C<poll>	2501	because they rely on inefficient but fork-safe C<select> or C<poll>
2138	calls. Only L<EV> is fully fork-aware.	2502	calls. Only L<EV> is fully fork-aware.
2139		2503
2140	If you have to fork, you must either do so I<before> creating your first	2504	If you have to fork, you must either do so I<before> creating your first
2141	watcher OR you must not use AnyEvent at all in the child.	2505	watcher OR you must not use AnyEvent at all in the child OR you must do
		2506	something completely out of the scope of AnyEvent.
2142		2507
2143		2508
2144	=head1 SECURITY CONSIDERATIONS	2509	=head1 SECURITY CONSIDERATIONS
2145		2510
2146	AnyEvent can be forced to load any event model via	2511	AnyEvent can be forced to load any event model via
…		…
2184	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2549	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2185		2550
2186	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2551	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2187	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2552	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2188	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2553	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2189	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.	2554	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.
2190		2555
2191	Non-blocking file handles, sockets, TCP clients and	2556	Non-blocking file handles, sockets, TCP clients and
2192	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	2557	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2193		2558
2194	Asynchronous DNS: L<AnyEvent::DNS>.	2559	Asynchronous DNS: L<AnyEvent::DNS>.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.236 by root, Fri Jul 10 22:35:27 2009 UTC vs. Revision 1.277 by root, Sun Aug 9 13:27:23 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.236 by root, Fri Jul 10 22:35:27 2009 UTC vs.
Revision 1.277 by root, Sun Aug 9 13:27:23 2009 UTC