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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.343 by root, Wed Dec 29 04:27:53 2010 UTC vs.
Revision 1.414 by root, Wed Aug 21 08:40:28 2013 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - the DBI of event loop programming	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt,
6	and POE are various supported event loops/environments.	6	FLTK 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
121	The interface itself is vaguely similar, but not identical to the L<Event>	121	The interface itself is vaguely similar, but not identical to the L<Event>
122	module.	122	module.
123		123
124	During the first call of any watcher-creation method, the module tries	124	During the first call of any watcher-creation method, the module tries
125	to detect the currently loaded event loop by probing whether one of the	125	to detect the currently loaded event loop by probing whether one of the
126	following modules is already loaded: L<EV>, L<AnyEvent::Impl::Perl>,	126	following modules is already loaded: L<EV>, L<AnyEvent::Loop>,
127	L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. The first one	127	L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. The first one
128	found is used. If none are detected, the module tries to load the first	128	found is used. If none are detected, the module tries to load the first
129	four modules in the order given; but note that if L<EV> is not	129	four modules in the order given; but note that if L<EV> is not
130	available, the pure-perl L<AnyEvent::Impl::Perl> should always work, so	130	available, the pure-perl L<AnyEvent::Loop> should always work, so
131	the other two are not normally tried.	131	the other two are not normally tried.
132		132
133	Because AnyEvent first checks for modules that are already loaded, loading	133	Because AnyEvent first checks for modules that are already loaded, loading
134	an event model explicitly before first using AnyEvent will likely make	134	an event model explicitly before first using AnyEvent will likely make
135	that model the default. For example:	135	that model the default. For example:
…		…
142	The I<likely> means that, if any module loads another event model and	142	The I<likely> means that, if any module loads another event model and
143	starts using it, all bets are off - this case should be very rare though,	143	starts using it, all bets are off - this case should be very rare though,
144	as very few modules hardcode event loops without announcing this very	144	as very few modules hardcode event loops without announcing this very
145	loudly.	145	loudly.
146		146
147	The pure-perl implementation of AnyEvent is called	147	The pure-perl implementation of AnyEvent is called C<AnyEvent::Loop>. Like
148	C<AnyEvent::Impl::Perl>. Like other event modules you can load it	148	other event modules you can load it explicitly and enjoy the high
149	explicitly and enjoy the high availability of that event loop :)	149	availability of that event loop :)
150		150
151	=head1 WATCHERS	151	=head1 WATCHERS
152		152
153	AnyEvent has the central concept of a I<watcher>, which is an object that	153	AnyEvent has the central concept of a I<watcher>, which is an object that
154	stores relevant data for each kind of event you are waiting for, such as	154	stores relevant data for each kind of event you are waiting for, such as
…		…
271		271
272	Example 2: fire an event after 0.5 seconds, then roughly every second.	272	Example 2: fire an event after 0.5 seconds, then roughly every second.
273		273
274	my $w = AnyEvent->timer (after => 0.5, interval => 1, cb => sub {	274	my $w = AnyEvent->timer (after => 0.5, interval => 1, cb => sub {
275	warn "timeout\n";	275	warn "timeout\n";
276	};	276	});
277		277
278	=head3 TIMING ISSUES	278	=head3 TIMING ISSUES
279		279
280	There are two ways to handle timers: based on real time (relative, "fire	280	There are two ways to handle timers: based on real time (relative, "fire
281	in 10 seconds") and based on wallclock time (absolute, "fire at 12	281	in 10 seconds") and based on wallclock time (absolute, "fire at 12
…		…
356	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into	356	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into
357	account.	357	account.
358		358
359	=item AnyEvent->now_update	359	=item AnyEvent->now_update
360		360
361	Some event loops (such as L<EV> or L<AnyEvent::Impl::Perl>) cache	361	Some event loops (such as L<EV> or L<AnyEvent::Loop>) cache the current
362	the current time for each loop iteration (see the discussion of L<<	362	time for each loop iteration (see the discussion of L<< AnyEvent->now >>,
363	AnyEvent->now >>, above).	363	above).
364		364
365	When a callback runs for a long time (or when the process sleeps), then	365	When a callback runs for a long time (or when the process sleeps), then
366	this "current" time will differ substantially from the real time, which	366	this "current" time will differ substantially from the real time, which
367	might affect timers and time-outs.	367	might affect timers and time-outs.
368		368
…		…
415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's	415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
416	pure perl implementation).	416	pure perl implementation).
417		417
418	=head3 Safe/Unsafe Signals	418	=head3 Safe/Unsafe Signals
419		419
420	Perl signals can be either "safe" (synchronous to opcode handling) or	420	Perl signals can be either "safe" (synchronous to opcode handling)
421	"unsafe" (asynchronous) - the former might get delayed indefinitely, the	421	or "unsafe" (asynchronous) - the former might delay signal delivery
422	latter might corrupt your memory.	422	indefinitely, the latter might corrupt your memory.
423		423
424	AnyEvent signal handlers are, in addition, synchronous to the event loop,	424	AnyEvent signal handlers are, in addition, synchronous to the event loop,
425	i.e. they will not interrupt your running perl program but will only be	425	i.e. they will not interrupt your running perl program but will only be
426	called as part of the normal event handling (just like timer, I/O etc.	426	called as part of the normal event handling (just like timer, I/O etc.
427	callbacks, too).	427	callbacks, too).
428		428
429	=head3 Signal Races, Delays and Workarounds	429	=head3 Signal Races, Delays and Workarounds
430		430
431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support
432	callbacks to signals in a generic way, which is a pity, as you cannot	432	attaching callbacks to signals in a generic way, which is a pity,
433	do race-free signal handling in perl, requiring C libraries for	433	as you cannot do race-free signal handling in perl, requiring
434	this. AnyEvent will try to do its best, which means in some cases,	434	C libraries for this. AnyEvent will try to do its best, which
435	signals will be delayed. The maximum time a signal might be delayed is	435	means in some cases, signals will be delayed. The maximum time
436	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This	436	a signal might be delayed is 10 seconds by default, but can
437	variable can be changed only before the first signal watcher is created,	437	be overriden via C<$ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY}> or
438	and should be left alone otherwise. This variable determines how often	438	C<$AnyEvent::MAX_SIGNAL_LATENCY> - see the L<ENVIRONMENT VARIABLES>
439	AnyEvent polls for signals (in case a wake-up was missed). Higher values	439	section for details.
440	will cause fewer spurious wake-ups, which is better for power and CPU
441	saving.
442		440
443	All these problems can be avoided by installing the optional	441	All these problems can be avoided by installing the optional
444	L<Async::Interrupt> module, which works with most event loops. It will not	442	L<Async::Interrupt> module, which works with most event loops. It will not
445	work with inherently broken event loops such as L<Event> or L<Event::Lib>	443	work with inherently broken event loops such as L<Event> or L<Event::Lib>
446	(and not with L<POE> currently, as POE does its own workaround with	444	(and not with L<POE> currently). For those, you just have to suffer the
447	one-second latency). For those, you just have to suffer the delays.	445	delays.
448		446
449	=head2 CHILD PROCESS WATCHERS	447	=head2 CHILD PROCESS WATCHERS
450		448
451	$w = AnyEvent->child (pid => <process id>, cb => <callback>);	449	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
452		450
…		…
482	thing in an AnyEvent program, you I<have> to create at least one	480	thing in an AnyEvent program, you I<have> to create at least one
483	watcher before you C<fork> the child (alternatively, you can call	481	watcher before you C<fork> the child (alternatively, you can call
484	C<AnyEvent::detect>).	482	C<AnyEvent::detect>).
485		483
486	As most event loops do not support waiting for child events, they will be	484	As most event loops do not support waiting for child events, they will be
487	emulated by AnyEvent in most cases, in which the latency and race problems	485	emulated by AnyEvent in most cases, in which case the latency and race
488	mentioned in the description of signal watchers apply.	486	problems mentioned in the description of signal watchers apply.
489		487
490	Example: fork a process and wait for it	488	Example: fork a process and wait for it
491		489
492	my $done = AnyEvent->condvar;	490	my $done = AnyEvent->condvar;
493		491
…		…
765	};	763	};
766	}	764	}
767		765
768	$cv->end;	766	$cv->end;
769		767
		768	...
		769
		770	my $results = $cv->recv;
		771
770	This code fragment supposedly pings a number of hosts and calls	772	This code fragment supposedly pings a number of hosts and calls
771	C<send> after results for all then have have been gathered - in any	773	C<send> after results for all then have have been gathered - in any
772	order. To achieve this, the code issues a call to C<begin> when it starts	774	order. To achieve this, the code issues a call to C<begin> when it starts
773	each ping request and calls C<end> when it has received some result for	775	each ping request and calls C<end> when it has received some result for
774	it. Since C<begin> and C<end> only maintain a counter, the order in which	776	it. Since C<begin> and C<end> only maintain a counter, the order in which
…		…
809		811
810	In list context, all parameters passed to C<send> will be returned,	812	In list context, all parameters passed to C<send> will be returned,
811	in scalar context only the first one will be returned.	813	in scalar context only the first one will be returned.
812		814
813	Note that doing a blocking wait in a callback is not supported by any	815	Note that doing a blocking wait in a callback is not supported by any
814	event loop, that is, recursive invocation of a blocking C<< ->recv	816	event loop, that is, recursive invocation of a blocking C<< ->recv >> is
815	>> is not allowed, and the C<recv> call will C<croak> if such a	817	not allowed and the C<recv> call will C<croak> if such a condition is
816	condition is detected. This condition can be slightly loosened by using	818	detected. This requirement can be dropped by relying on L<Coro::AnyEvent>
817	L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from	819	, which allows you to do a blocking C<< ->recv >> from any thread
818	any thread that doesn't run the event loop itself.	820	that doesn't run the event loop itself. L<Coro::AnyEvent> is loaded
		821	automatically when L<Coro> is used with L<AnyEvent>, so code does not need
		822	to do anything special to take advantage of that: any code that would
		823	normally block your program because it calls C<recv>, be executed in an
		824	C<async> thread instead without blocking other threads.
819		825
820	Not all event models support a blocking wait - some die in that case	826	Not all event models support a blocking wait - some die in that case
821	(programs might want to do that to stay interactive), so I<if you are	827	(programs might want to do that to stay interactive), so I<if you are
822	using this from a module, never require a blocking wait>. Instead, let the	828	using this from a module, never require a blocking wait>. Instead, let the
823	caller decide whether the call will block or not (for example, by coupling	829	caller decide whether the call will block or not (for example, by coupling
…		…
860	use. If EV is not installed, then AnyEvent will fall back to its own	866	use. If EV is not installed, then AnyEvent will fall back to its own
861	pure-perl implementation, which is available everywhere as it comes with	867	pure-perl implementation, which is available everywhere as it comes with
862	AnyEvent itself.	868	AnyEvent itself.
863		869
864	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	870	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
865	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	871	AnyEvent::Impl::Perl pure-perl AnyEvent::Loop, fast and portable.
866		872
867	=item Backends that are transparently being picked up when they are used.	873	=item Backends that are transparently being picked up when they are used.
868		874
869	These will be used if they are already loaded when the first watcher	875	These will be used if they are already loaded when the first watcher
870	is created, in which case it is assumed that the application is using	876	is created, in which case it is assumed that the application is using
…		…
877	AnyEvent::Impl::Tk based on Tk, very broken.	883	AnyEvent::Impl::Tk based on Tk, very broken.
878	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	884	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879	AnyEvent::Impl::POE based on POE, very slow, some limitations.	885	AnyEvent::Impl::POE based on POE, very slow, some limitations.
880	AnyEvent::Impl::Irssi used when running within irssi.	886	AnyEvent::Impl::Irssi used when running within irssi.
881	AnyEvent::Impl::IOAsync based on IO::Async.	887	AnyEvent::Impl::IOAsync based on IO::Async.
		888	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
		889	AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
882		890
883	=item Backends with special needs.	891	=item Backends with special needs.
884		892
885	Qt requires the Qt::Application to be instantiated first, but will	893	Qt requires the Qt::Application to be instantiated first, but will
886	otherwise be picked up automatically. As long as the main program	894	otherwise be picked up automatically. As long as the main program
…		…
931		939
932	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	940	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
933	if necessary. You should only call this function right before you would	941	if necessary. You should only call this function right before you would
934	have created an AnyEvent watcher anyway, that is, as late as possible at	942	have created an AnyEvent watcher anyway, that is, as late as possible at
935	runtime, and not e.g. during initialisation of your module.	943	runtime, and not e.g. during initialisation of your module.
		944
		945	The effect of calling this function is as if a watcher had been created
		946	(specifically, actions that happen "when the first watcher is created"
		947	happen when calling detetc as well).
936		948
937	If you need to do some initialisation before AnyEvent watchers are	949	If you need to do some initialisation before AnyEvent watchers are
938	created, use C<post_detect>.	950	created, use C<post_detect>.
939		951
940	=item $guard = AnyEvent::post_detect { BLOCK }	952	=item $guard = AnyEvent::post_detect { BLOCK }
…		…
1003	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent	1015	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
1004	# as soon as it is	1016	# as soon as it is
1005	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };	1017	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
1006	}	1018	}
1007		1019
		1020	=item AnyEvent::postpone { BLOCK }
		1021
		1022	Arranges for the block to be executed as soon as possible, but not before
		1023	the call itself returns. In practise, the block will be executed just
		1024	before the event loop polls for new events, or shortly afterwards.
		1025
		1026	This function never returns anything (to make the C<return postpone { ...
		1027	}> idiom more useful.
		1028
		1029	To understand the usefulness of this function, consider a function that
		1030	asynchronously does something for you and returns some transaction
		1031	object or guard to let you cancel the operation. For example,
		1032	C<AnyEvent::Socket::tcp_connect>:
		1033
		1034	# start a conenction attempt unless one is active
		1035	$self->{connect_guard} \|\|= AnyEvent::Socket::tcp_connect "www.example.net", 80, sub {
		1036	delete $self->{connect_guard};
		1037	...
		1038	};
		1039
		1040	Imagine that this function could instantly call the callback, for
		1041	example, because it detects an obvious error such as a negative port
		1042	number. Invoking the callback before the function returns causes problems
		1043	however: the callback will be called and will try to delete the guard
		1044	object. But since the function hasn't returned yet, there is nothing to
		1045	delete. When the function eventually returns it will assign the guard
		1046	object to C<< $self->{connect_guard} >>, where it will likely never be
		1047	deleted, so the program thinks it is still trying to connect.
		1048
		1049	This is where C<AnyEvent::postpone> should be used. Instead of calling the
		1050	callback directly on error:
		1051
		1052	$cb->(undef), return # signal error to callback, BAD!
		1053	if $some_error_condition;
		1054
		1055	It should use C<postpone>:
		1056
		1057	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
		1058	if $some_error_condition;
		1059
		1060	=item AnyEvent::log $level, $msg[, @args]
		1061
		1062	Log the given C<$msg> at the given C<$level>.
		1063
		1064	If L<AnyEvent::Log> is not loaded then this function makes a simple test
		1065	to see whether the message will be logged. If the test succeeds it will
		1066	load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
		1067	the L<AnyEvent::Log> documentation for details.
		1068
		1069	If the test fails it will simply return. Right now this happens when a
		1070	numerical loglevel is used and it is larger than the level specified via
		1071	C<$ENV{PERL_ANYEVENT_VERBOSE}>.
		1072
		1073	If you want to sprinkle loads of logging calls around your code, consider
		1074	creating a logger callback with the C<AnyEvent::Log::logger> function,
		1075	which can reduce typing, codesize and can reduce the logging overhead
		1076	enourmously.
		1077
1008	=back	1078	=back
1009		1079
1010	=head1 WHAT TO DO IN A MODULE	1080	=head1 WHAT TO DO IN A MODULE
1011		1081
1012	As a module author, you should C<use AnyEvent> and call AnyEvent methods	1082	As a module author, you should C<use AnyEvent> and call AnyEvent methods
…		…
1045	modules might create watchers when they are loaded, and AnyEvent will	1115	modules might create watchers when they are loaded, and AnyEvent will
1046	decide on the event model to use as soon as it creates watchers, and it	1116	decide on the event model to use as soon as it creates watchers, and it
1047	might choose the wrong one unless you load the correct one yourself.	1117	might choose the wrong one unless you load the correct one yourself.
1048		1118
1049	You can chose to use a pure-perl implementation by loading the	1119	You can chose to use a pure-perl implementation by loading the
1050	C<AnyEvent::Impl::Perl> module, which gives you similar behaviour	1120	C<AnyEvent::Loop> module, which gives you similar behaviour
1051	everywhere, but letting AnyEvent chose the model is generally better.	1121	everywhere, but letting AnyEvent chose the model is generally better.
1052		1122
1053	=head2 MAINLOOP EMULATION	1123	=head2 MAINLOOP EMULATION
1054		1124
1055	Sometimes (often for short test scripts, or even standalone programs who	1125	Sometimes (often for short test scripts, or even standalone programs who
…		…
1068		1138
1069		1139
1070	=head1 OTHER MODULES	1140	=head1 OTHER MODULES
1071		1141
1072	The following is a non-exhaustive list of additional modules that use	1142	The following is a non-exhaustive list of additional modules that use
1073	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1143	AnyEvent as a client and can therefore be mixed easily with other
1074	modules and other event loops in the same program. Some of the modules	1144	AnyEvent modules and other event loops in the same program. Some of the
1075	come as part of AnyEvent, the others are available via CPAN.	1145	modules come as part of AnyEvent, the others are available via CPAN (see
		1146	L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
		1147	a longer non-exhaustive list), and the list is heavily biased towards
		1148	modules of the AnyEvent author himself :)
1076		1149
1077	=over 4	1150	=over 4
1078		1151
1079	=item L<AnyEvent::Util>	1152	=item L<AnyEvent::Util> (part of the AnyEvent distribution)
1080		1153
1081	Contains various utility functions that replace often-used blocking	1154	Contains various utility functions that replace often-used blocking
1082	functions such as C<inet_aton> with event/callback-based versions.	1155	functions such as C<inet_aton> with event/callback-based versions.
1083		1156
1084	=item L<AnyEvent::Socket>	1157	=item L<AnyEvent::Socket> (part of the AnyEvent distribution)
1085		1158
1086	Provides various utility functions for (internet protocol) sockets,	1159	Provides various utility functions for (internet protocol) sockets,
1087	addresses and name resolution. Also functions to create non-blocking tcp	1160	addresses and name resolution. Also functions to create non-blocking tcp
1088	connections or tcp servers, with IPv6 and SRV record support and more.	1161	connections or tcp servers, with IPv6 and SRV record support and more.
1089		1162
1090	=item L<AnyEvent::Handle>	1163	=item L<AnyEvent::Handle> (part of the AnyEvent distribution)
1091		1164
1092	Provide read and write buffers, manages watchers for reads and writes,	1165	Provide read and write buffers, manages watchers for reads and writes,
1093	supports raw and formatted I/O, I/O queued and fully transparent and	1166	supports raw and formatted I/O, I/O queued and fully transparent and
1094	non-blocking SSL/TLS (via L<AnyEvent::TLS>).	1167	non-blocking SSL/TLS (via L<AnyEvent::TLS>).
1095		1168
1096	=item L<AnyEvent::DNS>	1169	=item L<AnyEvent::DNS> (part of the AnyEvent distribution)
1097		1170
1098	Provides rich asynchronous DNS resolver capabilities.	1171	Provides rich asynchronous DNS resolver capabilities.
1099		1172
1100	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>	1173	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1101		1174
1102	Implement event-based interfaces to the protocols of the same name (for	1175	Implement event-based interfaces to the protocols of the same name (for
1103	the curious, IGS is the International Go Server and FCP is the Freenet	1176	the curious, IGS is the International Go Server and FCP is the Freenet
1104	Client Protocol).	1177	Client Protocol).
1105		1178
1106	=item L<AnyEvent::Handle::UDP>	1179	=item L<AnyEvent::AIO> (part of the AnyEvent distribution)
1107
1108	Here be danger!
1109
1110	As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1111	there are so many things wrong with AnyEvent::Handle::UDP, most notably
1112	its use of a stream-based API with a protocol that isn't streamable, that
1113	the only way to improve it is to delete it.
1114
1115	It features data corruption (but typically only under load) and general
1116	confusion. On top, the author is not only clueless about UDP but also
1117	fact-resistant - some gems of his understanding: "connect doesn't work
1118	with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1119	packets", "I don't need to implement proper error checking as UDP doesn't
1120	support error checking" and so on - he doesn't even understand what's
1121	wrong with his module when it is explained to him.
1122
1123	=item L<AnyEvent::DBI>
1124
1125	Executes L<DBI> requests asynchronously in a proxy process for you,
1126	notifying you in an event-based way when the operation is finished.
1127
1128	=item L<AnyEvent::AIO>
1129		1180
1130	Truly asynchronous (as opposed to non-blocking) I/O, should be in the	1181	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1131	toolbox of every event programmer. AnyEvent::AIO transparently fuses	1182	toolbox of every event programmer. AnyEvent::AIO transparently fuses
1132	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based	1183	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1133	file I/O, and much more.	1184	file I/O, and much more.
1134		1185
		1186	=item L<AnyEvent::Filesys::Notify>
		1187
		1188	AnyEvent is good for non-blocking stuff, but it can't detect file or
		1189	path changes (e.g. "watch this directory for new files", "watch this
		1190	file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
		1191	do just that in a portbale fashion, supporting inotify on GNU/Linux and
		1192	some weird, without doubt broken, stuff on OS X to monitor files. It can
		1193	fall back to blocking scans at regular intervals transparently on other
		1194	platforms, so it's about as portable as it gets.
		1195
		1196	(I haven't used it myself, but I haven't heard anybody complaining about
		1197	it yet).
		1198
		1199	=item L<AnyEvent::DBI>
		1200
		1201	Executes L<DBI> requests asynchronously in a proxy process for you,
		1202	notifying you in an event-based way when the operation is finished.
		1203
1135	=item L<AnyEvent::HTTPD>	1204	=item L<AnyEvent::HTTPD>
1136		1205
1137	A simple embedded webserver.	1206	A simple embedded webserver.
1138		1207
1139	=item L<AnyEvent::FastPing>	1208	=item L<AnyEvent::FastPing>
1140		1209
1141	The fastest ping in the west.	1210	The fastest ping in the west.
1142		1211
1143	=item L<Coro>	1212	=item L<Coro>
1144		1213
1145	Has special support for AnyEvent via L<Coro::AnyEvent>.	1214	Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
		1215	to simply invert the flow control - don't call us, we will call you:
		1216
		1217	async {
		1218	Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
		1219	print "5 seconds later!\n";
		1220
		1221	Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
		1222	my $line = <STDIN>; # works for ttys
		1223
		1224	AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
		1225	my ($body, $hdr) = Coro::rouse_wait;
		1226	};
1146		1227
1147	=back	1228	=back
1148		1229
1149	=cut	1230	=cut
1150		1231
1151	package AnyEvent;	1232	package AnyEvent;
1152
1153	# basically a tuned-down version of common::sense
1154	sub common_sense {
1155	# from common:.sense 3.3
1156	${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf3\x0f\xc0\xf0\xfc\x33\x00";
1157	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1158	$^H \|= 0x00000600;
1159	}
1160
1161	BEGIN { AnyEvent::common_sense }
1162
1163	use Carp ();
1164
1165	our $VERSION = '5.29';
1166	our $MODEL;
1167
1168	our $AUTOLOAD;
1169	our @ISA;
1170
1171	our @REGISTRY;
1172
1173	our $VERBOSE;
1174		1233
1175	BEGIN {	1234	BEGIN {
1176	require "AnyEvent/constants.pl";	1235	require "AnyEvent/constants.pl";
		1236	&AnyEvent::common_sense;
		1237	}
1177		1238
		1239	use Carp ();
		1240
		1241	our $VERSION = '7.05';
		1242	our $MODEL;
		1243	our @ISA;
		1244	our @REGISTRY;
		1245	our $VERBOSE;
		1246	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
		1247	our $MAX_SIGNAL_LATENCY = $ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY} \|\| 10; # executes after the BEGIN block below (tainting!)
		1248
		1249	BEGIN {
1178	eval "sub TAINT (){" . (${^TAINT}*1) . "}";	1250	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1179		1251
1180	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1252	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1181	if ${^TAINT};	1253	if ${^TAINT};
1182		1254
1183	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1255	$ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
		1256	for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1184		1257
1185	}	1258	@ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
		1259	if ${^TAINT};
1186		1260
1187	our $MAX_SIGNAL_LATENCY = 10;	1261	# $ENV{PERL_ANYEVENT_xxx} now valid
1188		1262
1189	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1263	$VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 4;
1190		1264
1191	{
1192	my $idx;	1265	my $idx;
1193	$PROTOCOL{$_} = ++$idx	1266	$PROTOCOL{$_} = ++$idx
1194	for reverse split /\s,\s/,	1267	for reverse split /\s,\s/,
1195	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1268	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1196	}	1269	}
1197		1270
		1271	our @post_detect;
		1272
		1273	sub post_detect(&) {
		1274	my ($cb) = @_;
		1275
		1276	push @post_detect, $cb;
		1277
		1278	defined wantarray
		1279	? bless \$cb, "AnyEvent::Util::postdetect"
		1280	: ()
		1281	}
		1282
		1283	sub AnyEvent::Util::postdetect::DESTROY {
		1284	@post_detect = grep $_ != ${$_[0]}, @post_detect;
		1285	}
		1286
		1287	our $POSTPONE_W;
		1288	our @POSTPONE;
		1289
		1290	sub _postpone_exec {
		1291	undef $POSTPONE_W;
		1292
		1293	&{ shift @POSTPONE }
		1294	while @POSTPONE;
		1295	}
		1296
		1297	sub postpone(&) {
		1298	push @POSTPONE, shift;
		1299
		1300	$POSTPONE_W \|\|= AE::timer (0, 0, \&_postpone_exec);
		1301
		1302	()
		1303	}
		1304
		1305	sub log($$;@) {
		1306	# only load the big bloated module when we actually are about to log something
		1307	if ($_[0] <= ($VERBOSE \|\| 1)) { # also catches non-numeric levels(!) and fatal
		1308	local ($!, $@);
		1309	require AnyEvent::Log; # among other things, sets $VERBOSE to 9
		1310	# AnyEvent::Log overwrites this function
		1311	goto &log;
		1312	}
		1313
		1314	0 # not logged
		1315	}
		1316
		1317	sub _logger($;$) {
		1318	my ($level, $renabled) = @_;
		1319
		1320	$$renabled = $level <= $VERBOSE;
		1321
		1322	my $logger = [(caller)[0], $level, $renabled];
		1323
		1324	$AnyEvent::Log::LOGGER{$logger+0} = $logger;
		1325
		1326	# return unless defined wantarray;
		1327	#
		1328	# require AnyEvent::Util;
		1329	# my $guard = AnyEvent::Util::guard (sub {
		1330	# # "clean up"
		1331	# delete $LOGGER{$logger+0};
		1332	# });
		1333	#
		1334	# sub {
		1335	# return 0 unless $$renabled;
		1336	#
		1337	# $guard if 0; # keep guard alive, but don't cause runtime overhead
		1338	# require AnyEvent::Log unless $AnyEvent::Log::VERSION;
		1339	# package AnyEvent::Log;
		1340	# _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time
		1341	# }
		1342	}
		1343
		1344	if (length $ENV{PERL_ANYEVENT_LOG}) {
		1345	require AnyEvent::Log; # AnyEvent::Log does the thing for us
		1346	}
		1347
1198	my @models = (	1348	our @models = (
1199	[EV:: => AnyEvent::Impl::EV:: , 1],	1349	[EV:: => AnyEvent::Impl::EV::],
1200	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1350	[AnyEvent::Loop:: => AnyEvent::Impl::Perl::],
1201	# everything below here will not (normally) be autoprobed	1351	# everything below here will not (normally) be autoprobed
1202	# as the pureperl backend should work everywhere	1352	# as the pure perl backend should work everywhere
1203	# and is usually faster	1353	# and is usually faster
		1354	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package, so msut be near the top
1204	[Event:: => AnyEvent::Impl::Event::, 1],	1355	[Event:: => AnyEvent::Impl::Event::], # slow, stable
1205	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1356	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
		1357	# everything below here should not be autoloaded
1206	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1358	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1207	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1208	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1359	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1209	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1360	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1210	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1361	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1211	[Wx:: => AnyEvent::Impl::POE::],	1362	[Wx:: => AnyEvent::Impl::POE::],
1212	[Prima:: => AnyEvent::Impl::POE::],	1363	[Prima:: => AnyEvent::Impl::POE::],
1213	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::],	1364	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
		1365	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
		1366	[FLTK:: => AnyEvent::Impl::FLTK::],
1214	);	1367	);
1215		1368
1216	our %method = map +($_ => 1),	1369	our @isa_hook;
		1370
		1371	sub _isa_set {
		1372	my @pkg = ("AnyEvent", (map $_->[0], grep defined, @isa_hook), $MODEL);
		1373
		1374	@{"$pkg[$_-1]::ISA"} = $pkg[$_]
		1375	for 1 .. $#pkg;
		1376
		1377	grep $_ && $_->[1], @isa_hook
		1378	and AE::_reset ();
		1379	}
		1380
		1381	# used for hooking AnyEvent::Strict and AnyEvent::Debug::Wrap into the class hierarchy
		1382	sub _isa_hook($$;$) {
		1383	my ($i, $pkg, $reset_ae) = @_;
		1384
		1385	$isa_hook[$i] = $pkg ? [$pkg, $reset_ae] : undef;
		1386
		1387	_isa_set;
		1388	}
		1389
		1390	# all autoloaded methods reserve the complete glob, not just the method slot.
		1391	# due to bugs in perls method cache implementation.
1217	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1392	our @methods = qw(io timer time now now_update signal child idle condvar);
1218
1219	our @post_detect;
1220
1221	sub post_detect(&) {
1222	my ($cb) = @_;
1223
1224	push @post_detect, $cb;
1225
1226	defined wantarray
1227	? bless \$cb, "AnyEvent::Util::postdetect"
1228	: ()
1229	}
1230
1231	sub AnyEvent::Util::postdetect::DESTROY {
1232	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1233	}
1234		1393
1235	sub detect() {	1394	sub detect() {
		1395	return $MODEL if $MODEL; # some programs keep references to detect
		1396
		1397	# IO::Async::Loop::AnyEvent is extremely evil, refuse to work with it
		1398	# the author knows about the problems and what it does to AnyEvent as a whole
		1399	# (and the ability of others to use AnyEvent), but simply wants to abuse AnyEvent
		1400	# anyway.
		1401	AnyEvent::log fatal => "IO::Async::Loop::AnyEvent detected - that module is broken by\n"
		1402	. "design, abuses internals and breaks AnyEvent - will not continue."
		1403	if exists $INC{"IO/Async/Loop/AnyEvent.pm"};
		1404
		1405	local $!; # for good measure
		1406	local $SIG{__DIE__}; # we use eval
		1407
1236	# free some memory	1408	# free some memory
1237	*detect = sub () { $MODEL };	1409	*detect = sub () { $MODEL };
		1410	# undef &func doesn't correctly update the method cache. grmbl.
		1411	# so we delete the whole glob. grmbl.
		1412	# otoh, perl doesn't let me undef an active usb, but it lets me free
		1413	# a glob with an active sub. hrm. i hope it works, but perl is
		1414	# usually buggy in this department. sigh.
		1415	delete @{"AnyEvent::"}{@methods};
		1416	undef @methods;
1238		1417
1239	local $!; # for good measure
1240	local $SIG{__DIE__};
1241
1242	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1418	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1243	my $model = "AnyEvent::Impl::$1";	1419	my $model = $1;
		1420	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1244	if (eval "require $model") {	1421	if (eval "require $model") {
		1422	AnyEvent::log 7 => "Loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1245	$MODEL = $model;	1423	$MODEL = $model;
1246	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1247	} else {	1424	} else {
1248	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1425	AnyEvent::log 4 => "Unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1249	}	1426	}
1250	}	1427	}
1251		1428
1252	# check for already loaded models	1429	# check for already loaded models
1253	unless ($MODEL) {	1430	unless ($MODEL) {
1254	for (@REGISTRY, @models) {	1431	for (@REGISTRY, @models) {
1255	my ($package, $model) = @$_;	1432	my ($package, $model) = @$_;
1256	if (${"$package\::VERSION"} > 0) {	1433	if (${"$package\::VERSION"} > 0) {
1257	if (eval "require $model") {	1434	if (eval "require $model") {
		1435	AnyEvent::log 7 => "Autodetected model '$model', using it.";
1258	$MODEL = $model;	1436	$MODEL = $model;
1259	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1437	last;
		1438	} else {
		1439	AnyEvent::log 8 => "Detected event loop $package, but cannot load '$model', skipping: $@";
		1440	}
		1441	}
		1442	}
		1443
		1444	unless ($MODEL) {
		1445	# try to autoload a model
		1446	for (@REGISTRY, @models) {
		1447	my ($package, $model) = @$_;
		1448	if (
		1449	eval "require $package"
		1450	and ${"$package\::VERSION"} > 0
		1451	and eval "require $model"
		1452	) {
		1453	AnyEvent::log 7 => "Autoloaded model '$model', using it.";
		1454	$MODEL = $model;
1260	last;	1455	last;
1261	}	1456	}
1262	}	1457	}
1263	}
1264
1265	unless ($MODEL) {
1266	# try to autoload a model
1267	for (@REGISTRY, @models) {
1268	my ($package, $model, $autoload) = @$_;
1269	if (
1270	$autoload
1271	and eval "require $package"
1272	and ${"$package\::VERSION"} > 0
1273	and eval "require $model"
1274	) {
1275	$MODEL = $model;
1276	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1277	last;
1278	}
1279	}
1280		1458
1281	$MODEL	1459	$MODEL
1282	or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n";	1460	or AnyEvent::log fatal => "Backend autodetection failed - did you properly install AnyEvent?";
1283	}	1461	}
1284	}	1462	}
1285		1463
1286	@models = (); # free probe data	1464	# free memory only needed for probing
		1465	undef @models;
		1466	undef @REGISTRY;
1287		1467
1288	push @{"$MODEL\::ISA"}, "AnyEvent::Base";	1468	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1289	unshift @ISA, $MODEL;
1290		1469
1291	# now nuke some methods that are overridden by the backend.	1470	# now nuke some methods that are overridden by the backend.
1292	# SUPER is not allowed.	1471	# SUPER usage is not allowed in these.
1293	for (qw(time signal child idle)) {	1472	for (qw(time signal child idle)) {
1294	undef &{"AnyEvent::Base::$_"}	1473	undef &{"AnyEvent::Base::$_"}
1295	if defined &{"$MODEL\::$_"};	1474	if defined &{"$MODEL\::$_"};
1296	}	1475	}
1297		1476
		1477	_isa_set;
		1478
		1479	# we're officially open!
		1480
1298	if ($ENV{PERL_ANYEVENT_STRICT}) {	1481	if ($ENV{PERL_ANYEVENT_STRICT}) {
1299	eval { require AnyEvent::Strict };	1482	require AnyEvent::Strict;
1300	warn "AnyEvent: cannot load AnyEvent::Strict: $@"
1301	if $@ && $VERBOSE;
1302	}	1483	}
1303		1484
		1485	if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
		1486	require AnyEvent::Debug;
		1487	AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
		1488	}
		1489
		1490	if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
		1491	require AnyEvent::Socket;
		1492	require AnyEvent::Debug;
		1493
		1494	my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
		1495	$shell =~ s/\$\$/$$/g;
		1496
		1497	my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
		1498	$AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
		1499	}
		1500
		1501	# now the anyevent environment is set up as the user told us to, so
		1502	# call the actual user code - post detects
		1503
1304	(shift @post_detect)->() while @post_detect;	1504	(shift @post_detect)->() while @post_detect;
		1505	undef @post_detect;
1305		1506
1306	*post_detect = sub(&) {	1507	*post_detect = sub(&) {
1307	shift->();	1508	shift->();
1308		1509
1309	undef	1510	undef
1310	};	1511	};
1311		1512
1312	$MODEL	1513	$MODEL
1313	}	1514	}
1314		1515
1315	sub AUTOLOAD {	1516	for my $name (@methods) {
1316	(my $func = $AUTOLOAD) =~ s/.*://;	1517	*$name = sub {
1317
1318	$method{$func}
1319	or Carp::croak "$func: not a valid AnyEvent class method";
1320
1321	detect;	1518	detect;
1322		1519	# we use goto because
1323	my $class = shift;	1520	# a) it makes the thunk more transparent
1324	$class->$func (@_);	1521	# b) it allows us to delete the thunk later
		1522	goto &{ UNIVERSAL::can AnyEvent => "SUPER::$name" }
		1523	};
1325	}	1524	}
1326		1525
1327	# utility function to dup a filehandle. this is used by many backends	1526	# utility function to dup a filehandle. this is used by many backends
1328	# to support binding more than one watcher per filehandle (they usually	1527	# to support binding more than one watcher per filehandle (they usually
1329	# allow only one watcher per fd, so we dup it to get a different one).	1528	# allow only one watcher per fd, so we dup it to get a different one).
…		…
1353		1552
1354	package AE;	1553	package AE;
1355		1554
1356	our $VERSION = $AnyEvent::VERSION;	1555	our $VERSION = $AnyEvent::VERSION;
1357		1556
		1557	sub _reset() {
		1558	eval q{
1358	# fall back to the main API by default - backends and AnyEvent::Base	1559	# fall back to the main API by default - backends and AnyEvent::Base
1359	# implementations can overwrite these.	1560	# implementations can overwrite these.
1360		1561
1361	sub io($$$) {	1562	sub io($$$) {
1362	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])	1563	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1363	}	1564	}
1364		1565
1365	sub timer($$$) {	1566	sub timer($$$) {
1366	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])	1567	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
1367	}	1568	}
1368		1569
1369	sub signal($$) {	1570	sub signal($$) {
1370	AnyEvent->signal (signal => $_[0], cb => $_[1])	1571	AnyEvent->signal (signal => $_[0], cb => $_[1])
1371	}	1572	}
1372		1573
1373	sub child($$) {	1574	sub child($$) {
1374	AnyEvent->child (pid => $_[0], cb => $_[1])	1575	AnyEvent->child (pid => $_[0], cb => $_[1])
1375	}	1576	}
1376		1577
1377	sub idle($) {	1578	sub idle($) {
1378	AnyEvent->idle (cb => $_[0])	1579	AnyEvent->idle (cb => $_[0]);
1379	}	1580	}
1380		1581
1381	sub cv(;&) {	1582	sub cv(;&) {
1382	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())	1583	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1383	}	1584	}
1384		1585
1385	sub now() {	1586	sub now() {
1386	AnyEvent->now	1587	AnyEvent->now
1387	}	1588	}
1388		1589
1389	sub now_update() {	1590	sub now_update() {
1390	AnyEvent->now_update	1591	AnyEvent->now_update
1391	}	1592	}
1392		1593
1393	sub time() {	1594	sub time() {
1394	AnyEvent->time	1595	AnyEvent->time
		1596	}
		1597
		1598	*postpone = \&AnyEvent::postpone;
		1599	*log = \&AnyEvent::log;
		1600	};
		1601	die if $@;
1395	}	1602	}
		1603
		1604	BEGIN { _reset }
1396		1605
1397	package AnyEvent::Base;	1606	package AnyEvent::Base;
1398		1607
1399	# default implementations for many methods	1608	# default implementations for many methods
1400		1609
1401	sub time {	1610	sub time {
1402	eval q{ # poor man's autoloading {}	1611	eval q{ # poor man's autoloading {}
1403	# probe for availability of Time::HiRes	1612	# probe for availability of Time::HiRes
1404	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1613	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1405	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1614	*time = sub { Time::HiRes::time () };
1406	*AE::time = \&Time::HiRes::time;	1615	*AE::time = \& Time::HiRes::time ;
		1616	*now = \&time;
		1617	AnyEvent::log 8 => "using Time::HiRes for sub-second timing accuracy.";
1407	# if (eval "use POSIX (); (POSIX::times())...	1618	# if (eval "use POSIX (); (POSIX::times())...
1408	} else {	1619	} else {
1409	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1620	*time = sub { CORE::time };
1410	*AE::time = sub (){ time }; # epic fail	1621	*AE::time = sub (){ CORE::time };
		1622	*now = \&time;
		1623	AnyEvent::log 3 => "Using built-in time(), no sub-second resolution!";
1411	}	1624	}
1412
1413	*time = sub { AE::time }; # different prototypes
1414	};	1625	};
1415	die if $@;	1626	die if $@;
1416		1627
1417	&time	1628	&time
1418	}	1629	}
1419		1630
1420	*now = \&time;	1631	*now = \&time;
1421
1422	sub now_update { }	1632	sub now_update { }
1423		1633
		1634	sub _poll {
		1635	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
		1636	}
		1637
1424	# default implementation for ->condvar	1638	# default implementation for ->condvar
		1639	# in fact, the default should not be overwritten
1425		1640
1426	sub condvar {	1641	sub condvar {
1427	eval q{ # poor man's autoloading {}	1642	eval q{ # poor man's autoloading {}
1428	*condvar = sub {	1643	*condvar = sub {
1429	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1644	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
…		…
1507		1722
1508	sub signal {	1723	sub signal {
1509	eval q{ # poor man's autoloading {}	1724	eval q{ # poor man's autoloading {}
1510	# probe for availability of Async::Interrupt	1725	# probe for availability of Async::Interrupt
1511	if (_have_async_interrupt) {	1726	if (_have_async_interrupt) {
1512	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1727	AnyEvent::log 8 => "Using Async::Interrupt for race-free signal handling.";
1513		1728
1514	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1729	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1515	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;	1730	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1516		1731
1517	} else {	1732	} else {
1518	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1733	AnyEvent::log 8 => "Using emulated perl signal handling with latency timer.";
1519		1734
1520	if (AnyEvent::WIN32) {	1735	if (AnyEvent::WIN32) {
1521	require AnyEvent::Util;	1736	require AnyEvent::Util;
1522		1737
1523	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1738	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
…		…
1599	: sysread $SIGPIPE_R, (my $dummy), 9;	1814	: sysread $SIGPIPE_R, (my $dummy), 9;
1600		1815
1601	while (%SIG_EV) {	1816	while (%SIG_EV) {
1602	for (keys %SIG_EV) {	1817	for (keys %SIG_EV) {
1603	delete $SIG_EV{$_};	1818	delete $SIG_EV{$_};
1604	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1819	&$_ for values %{ $SIG_CB{$_} \|\| {} };
1605	}	1820	}
1606	}	1821	}
1607	};	1822	};
1608	};	1823	};
1609	die if $@;	1824	die if $@;
…		…
1636	};	1851	};
1637		1852
1638	*child = sub {	1853	*child = sub {
1639	my (undef, %arg) = @_;	1854	my (undef, %arg) = @_;
1640		1855
1641	defined (my $pid = $arg{pid} + 0)	1856	my $pid = $arg{pid};
1642	or Carp::croak "required option 'pid' is missing";	1857	my $cb = $arg{cb};
1643		1858
1644	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1859	$PID_CB{$pid}{$cb+0} = $cb;
1645		1860
1646	unless ($CHLD_W) {	1861	unless ($CHLD_W) {
1647	$CHLD_W = AE::signal CHLD => \&_sigchld;	1862	$CHLD_W = AE::signal CHLD => \&_sigchld;
1648	# child could be a zombie already, so make at least one round	1863	# child could be a zombie already, so make at least one round
1649	&_sigchld;	1864	&_sigchld;
1650	}	1865	}
1651		1866
1652	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1867	bless [$pid, $cb+0], "AnyEvent::Base::child"
1653	};	1868	};
1654		1869
1655	*AnyEvent::Base::child::DESTROY = sub {	1870	*AnyEvent::Base::child::DESTROY = sub {
1656	my ($pid, $cb) = @{$_[0]};	1871	my ($pid, $icb) = @{$_[0]};
1657		1872
1658	delete $PID_CB{$pid}{$cb};	1873	delete $PID_CB{$pid}{$icb};
1659	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1874	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1660		1875
1661	undef $CHLD_W unless keys %PID_CB;	1876	undef $CHLD_W unless keys %PID_CB;
1662	};	1877	};
1663	};	1878	};
…		…
1676		1891
1677	my ($cb, $w, $rcb) = $arg{cb};	1892	my ($cb, $w, $rcb) = $arg{cb};
1678		1893
1679	$rcb = sub {	1894	$rcb = sub {
1680	if ($cb) {	1895	if ($cb) {
1681	$w = _time;	1896	$w = AE::time;
1682	&$cb;	1897	&$cb;
1683	$w = _time - $w;	1898	$w = AE::time - $w;
1684		1899
1685	# never use more then 50% of the time for the idle watcher,	1900	# never use more then 50% of the time for the idle watcher,
1686	# within some limits	1901	# within some limits
1687	$w = 0.0001 if $w < 0.0001;	1902	$w = 0.0001 if $w < 0.0001;
1688	$w = 5 if $w > 5;	1903	$w = 5 if $w > 5;
…		…
1735		1950
1736	sub _send {	1951	sub _send {
1737	# nop	1952	# nop
1738	}	1953	}
1739		1954
		1955	sub _wait {
		1956	AnyEvent->_poll until $_[0]{_ae_sent};
		1957	}
		1958
1740	sub send {	1959	sub send {
1741	my $cv = shift;	1960	my $cv = shift;
1742	$cv->{_ae_sent} = [@_];	1961	$cv->{_ae_sent} = [@_];
1743	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};	1962	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};
1744	$cv->_send;	1963	$cv->_send;
…		…
1751		1970
1752	sub ready {	1971	sub ready {
1753	$_[0]{_ae_sent}	1972	$_[0]{_ae_sent}
1754	}	1973	}
1755		1974
1756	sub _wait {
1757	$WAITING
1758	and !$_[0]{_ae_sent}
1759	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
1760
1761	local $WAITING = 1;
1762	AnyEvent->one_event while !$_[0]{_ae_sent};
1763	}
1764
1765	sub recv {	1975	sub recv {
		1976	unless ($_[0]{_ae_sent}) {
		1977	$WAITING
		1978	and Carp::croak "AnyEvent::CondVar: recursive blocking wait attempted";
		1979
		1980	local $WAITING = 1;
1766	$_[0]->_wait;	1981	$_[0]->_wait;
		1982	}
1767		1983
1768	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1984	$_[0]{_ae_croak}
1769	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1985	and Carp::croak $_[0]{_ae_croak};
		1986
		1987	wantarray
		1988	? @{ $_[0]{_ae_sent} }
		1989	: $_[0]{_ae_sent}[0]
1770	}	1990	}
1771		1991
1772	sub cb {	1992	sub cb {
1773	my $cv = shift;	1993	my $cv = shift;
1774		1994
…		…
1790	&{ $_[0]{_ae_end_cb} \|\| sub { $_[0]->send } };	2010	&{ $_[0]{_ae_end_cb} \|\| sub { $_[0]->send } };
1791	}	2011	}
1792		2012
1793	# undocumented/compatibility with pre-3.4	2013	# undocumented/compatibility with pre-3.4
1794	*broadcast = \&send;	2014	*broadcast = \&send;
1795	*wait = \&_wait;	2015	*wait = \&recv;
1796		2016
1797	=head1 ERROR AND EXCEPTION HANDLING	2017	=head1 ERROR AND EXCEPTION HANDLING
1798		2018
1799	In general, AnyEvent does not do any error handling - it relies on the	2019	In general, AnyEvent does not do any error handling - it relies on the
1800	caller to do that if required. The L<AnyEvent::Strict> module (see also	2020	caller to do that if required. The L<AnyEvent::Strict> module (see also
…		…
1812	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and	2032	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1813	so on.	2033	so on.
1814		2034
1815	=head1 ENVIRONMENT VARIABLES	2035	=head1 ENVIRONMENT VARIABLES
1816		2036
1817	The following environment variables are used by this module or its	2037	AnyEvent supports a number of environment variables that tune the
1818	submodules.	2038	runtime behaviour. They are usually evaluated when AnyEvent is
		2039	loaded, initialised, or a submodule that uses them is loaded. Many of
		2040	them also cause AnyEvent to load additional modules - for example,
		2041	C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
		2042	loaded.
1819		2043
1820	Note that AnyEvent will remove I<all> environment variables starting with	2044	All the environment variables documented here start with
1821	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is	2045	C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1822	enabled.	2046	namespace. Other modules are encouraged (but by no means required) to use
		2047	C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
		2048	namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
		2049	be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
		2050	variables starting with C<AE_>, see below).
		2051
		2052	All variables can also be set via the C<AE_> prefix, that is, instead
		2053	of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
		2054	case there is a clash btween anyevent and another program that uses
		2055	C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
		2056	variable to the empty string, as those variables take precedence.
		2057
		2058	When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
		2059	to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
		2060	exists. If taint mode is on, then AnyEvent will remove I<all> environment
		2061	variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
		2062	with C<undef> or the empty string, if the corresaponding C<AE_> variable
		2063	is set).
		2064
		2065	The exact algorithm is currently:
		2066
		2067	1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
		2068	2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
		2069	3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
		2070
		2071	This ensures that child processes will not see the C<AE_> variables.
		2072
		2073	The following environment variables are currently known to AnyEvent:
1823		2074
1824	=over 4	2075	=over 4
1825		2076
1826	=item C<PERL_ANYEVENT_VERBOSE>	2077	=item C<PERL_ANYEVENT_VERBOSE>
1827		2078
1828	By default, AnyEvent will be completely silent except in fatal	2079	By default, AnyEvent will log messages with loglevel C<4> (C<error>) or
1829	conditions. You can set this environment variable to make AnyEvent more	2080	higher (see L<AnyEvent::Log>). You can set this environment variable to a
1830	talkative.	2081	numerical loglevel to make AnyEvent more (or less) talkative.
1831		2082
		2083	If you want to do more than just set the global logging level
		2084	you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
		2085	complex specifications.
		2086
		2087	When set to C<0> (C<off>), then no messages whatsoever will be logged with
		2088	everything else at defaults.
		2089
1832	When set to C<1> or higher, causes AnyEvent to warn about unexpected	2090	When set to C<5> or higher (C<warn>), AnyEvent warns about unexpected
1833	conditions, such as not being able to load the event model specified by	2091	conditions, such as not being able to load the event model specified by
1834	C<PERL_ANYEVENT_MODEL>.	2092	C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an exception - this
		2093	is the minimum recommended level for use during development.
1835		2094
1836	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	2095	When set to C<7> or higher (info), AnyEvent reports which event model it
1837	model it chooses.	2096	chooses.
1838		2097
1839	When set to C<8> or higher, then AnyEvent will report extra information on	2098	When set to C<8> or higher (debug), then AnyEvent will report extra
1840	which optional modules it loads and how it implements certain features.	2099	information on which optional modules it loads and how it implements
		2100	certain features.
		2101
		2102	=item C<PERL_ANYEVENT_LOG>
		2103
		2104	Accepts rather complex logging specifications. For example, you could log
		2105	all C<debug> messages of some module to stderr, warnings and above to
		2106	stderr, and errors and above to syslog, with:
		2107
		2108	PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
		2109
		2110	For the rather extensive details, see L<AnyEvent::Log>.
		2111
		2112	This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
		2113	so will take effect even before AnyEvent has initialised itself.
		2114
		2115	Note that specifying this environment variable causes the L<AnyEvent::Log>
		2116	module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
		2117	using the latter saves a few hundred kB of memory unless a module
		2118	explicitly needs the extra features of AnyEvent::Log.
1841		2119
1842	=item C<PERL_ANYEVENT_STRICT>	2120	=item C<PERL_ANYEVENT_STRICT>
1843		2121
1844	AnyEvent does not do much argument checking by default, as thorough	2122	AnyEvent does not do much argument checking by default, as thorough
1845	argument checking is very costly. Setting this variable to a true value	2123	argument checking is very costly. Setting this variable to a true value
…		…
1852	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>	2130	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>
1853	>>, it is definitely recommended to keep it off in production. Keeping	2131	>>, it is definitely recommended to keep it off in production. Keeping
1854	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs	2132	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1855	can be very useful, however.	2133	can be very useful, however.
1856		2134
		2135	=item C<PERL_ANYEVENT_DEBUG_SHELL>
		2136
		2137	If this env variable is nonempty, then its contents will be interpreted by
		2138	C<AnyEvent::Socket::parse_hostport> and C<AnyEvent::Debug::shell> (after
		2139	replacing every occurance of C<$$> by the process pid). The shell object
		2140	is saved in C<$AnyEvent::Debug::SHELL>.
		2141
		2142	This happens when the first watcher is created.
		2143
		2144	For example, to bind a debug shell on a unix domain socket in
		2145	F<< /tmp/debug<pid>.sock >>, you could use this:
		2146
		2147	PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
		2148	# connect with e.g.: socat readline /tmp/debug123.sock
		2149
		2150	Or to bind to tcp port 4545 on localhost:
		2151
		2152	PERL_ANYEVENT_DEBUG_SHELL=127.0.0.1:4545 perlprog
		2153	# connect with e.g.: telnet localhost 4545
		2154
		2155	Note that creating sockets in F</tmp> or on localhost is very unsafe on
		2156	multiuser systems.
		2157
		2158	=item C<PERL_ANYEVENT_DEBUG_WRAP>
		2159
		2160	Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
		2161	debugging purposes. See C<AnyEvent::Debug::wrap> for details.
		2162
1857	=item C<PERL_ANYEVENT_MODEL>	2163	=item C<PERL_ANYEVENT_MODEL>
1858		2164
1859	This can be used to specify the event model to be used by AnyEvent, before	2165	This can be used to specify the event model to be used by AnyEvent, before
1860	auto detection and -probing kicks in. It must be a string consisting	2166	auto detection and -probing kicks in.
1861	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended	2167
		2168	It normally is a string consisting entirely of ASCII letters (e.g. C<EV>
		2169	or C<IOAsync>). The string C<AnyEvent::Impl::> gets prepended and the
1862	and the resulting module name is loaded and if the load was successful,	2170	resulting module name is loaded and - if the load was successful - used as
1863	used as event model. If it fails to load AnyEvent will proceed with	2171	event model backend. If it fails to load then AnyEvent will proceed with
1864	auto detection and -probing.	2172	auto detection and -probing.
1865		2173
1866	This functionality might change in future versions.	2174	If the string ends with C<::> instead (e.g. C<AnyEvent::Impl::EV::>) then
		2175	nothing gets prepended and the module name is used as-is (hint: C<::> at
		2176	the end of a string designates a module name and quotes it appropriately).
1867		2177
1868	For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you	2178	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1869	could start your program like this:	2179	could start your program like this:
1870		2180
1871	PERL_ANYEVENT_MODEL=Perl perl ...	2181	PERL_ANYEVENT_MODEL=Perl perl ...
		2182
		2183	=item C<PERL_ANYEVENT_IO_MODEL>
		2184
		2185	The current file I/O model - see L<AnyEvent::IO> for more info.
		2186
		2187	At the moment, only C<Perl> (small, pure-perl, synchronous) and
		2188	C<IOAIO> (truly asynchronous) are supported. The default is C<IOAIO> if
		2189	L<AnyEvent::AIO> can be loaded, otherwise it is C<Perl>.
1872		2190
1873	=item C<PERL_ANYEVENT_PROTOCOLS>	2191	=item C<PERL_ANYEVENT_PROTOCOLS>
1874		2192
1875	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences	2193	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
1876	for IPv4 or IPv6. The default is unspecified (and might change, or be the result	2194	for IPv4 or IPv6. The default is unspecified (and might change, or be the result
…		…
1889	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	2207	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1890	- only support IPv4, never try to resolve or contact IPv6	2208	- only support IPv4, never try to resolve or contact IPv6
1891	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	2209	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1892	IPv6, but prefer IPv6 over IPv4.	2210	IPv6, but prefer IPv6 over IPv4.
1893		2211
		2212	=item C<PERL_ANYEVENT_HOSTS>
		2213
		2214	This variable, if specified, overrides the F</etc/hosts> file used by
		2215	L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
		2216	from that file instead.
		2217
1894	=item C<PERL_ANYEVENT_EDNS0>	2218	=item C<PERL_ANYEVENT_EDNS0>
1895		2219
1896	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension	2220	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
1897	for DNS. This extension is generally useful to reduce DNS traffic, but	2221	DNS. This extension is generally useful to reduce DNS traffic, especially
1898	some (broken) firewalls drop such DNS packets, which is why it is off by	2222	when DNSSEC is involved, but some (broken) firewalls drop such DNS
1899	default.	2223	packets, which is why it is off by default.
1900		2224
1901	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce	2225	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
1902	EDNS0 in its DNS requests.	2226	EDNS0 in its DNS requests.
1903		2227
1904	=item C<PERL_ANYEVENT_MAX_FORKS>	2228	=item C<PERL_ANYEVENT_MAX_FORKS>
…		…
1910		2234
1911	The default value for the C<max_outstanding> parameter for the default DNS	2235	The default value for the C<max_outstanding> parameter for the default DNS
1912	resolver - this is the maximum number of parallel DNS requests that are	2236	resolver - this is the maximum number of parallel DNS requests that are
1913	sent to the DNS server.	2237	sent to the DNS server.
1914		2238
		2239	=item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY>
		2240
		2241	Perl has inherently racy signal handling (you can basically choose between
		2242	losing signals and memory corruption) - pure perl event loops (including
		2243	C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore
		2244	have to poll regularly to avoid losing signals.
		2245
		2246	Some event loops are racy, but don't poll regularly, and some event loops
		2247	are written in C but are still racy. For those event loops, AnyEvent
		2248	installs a timer that regularly wakes up the event loop.
		2249
		2250	By default, the interval for this timer is C<10> seconds, but you can
		2251	override this delay with this environment variable (or by setting
		2252	the C<$AnyEvent::MAX_SIGNAL_LATENCY> variable before creating signal
		2253	watchers).
		2254
		2255	Lower values increase CPU (and energy) usage, higher values can introduce
		2256	long delays when reaping children or waiting for signals.
		2257
		2258	The L<AnyEvent::Async> module, if available, will be used to avoid this
		2259	polling (with most event loops).
		2260
1915	=item C<PERL_ANYEVENT_RESOLV_CONF>	2261	=item C<PERL_ANYEVENT_RESOLV_CONF>
1916		2262
1917	The file to use instead of F</etc/resolv.conf> (or OS-specific	2263	The absolute path to a F<resolv.conf>-style file to use instead of
1918	configuration) in the default resolver. When set to the empty string, no	2264	F</etc/resolv.conf> (or the OS-specific configuration) in the default
1919	default config will be used.	2265	resolver, or the empty string to select the default configuration.
1920		2266
1921	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.	2267	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
1922		2268
1923	When neither C<ca_file> nor C<ca_path> was specified during	2269	When neither C<ca_file> nor C<ca_path> was specified during
1924	L<AnyEvent::TLS> context creation, and either of these environment	2270	L<AnyEvent::TLS> context creation, and either of these environment
1925	variables exist, they will be used to specify CA certificate locations	2271	variables are nonempty, they will be used to specify CA certificate
1926	instead of a system-dependent default.	2272	locations instead of a system-dependent default.
1927		2273
1928	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>	2274	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
1929		2275
1930	When these are set to C<1>, then the respective modules are not	2276	When these are set to C<1>, then the respective modules are not
1931	loaded. Mostly good for testing AnyEvent itself.	2277	loaded. Mostly good for testing AnyEvent itself.
…		…
2263	(even when used without AnyEvent), but most event loops have acceptable	2609	(even when used without AnyEvent), but most event loops have acceptable
2264	performance with or without AnyEvent.	2610	performance with or without AnyEvent.
2265		2611
2266	=item * The overhead AnyEvent adds is usually much smaller than the overhead of	2612	=item * The overhead AnyEvent adds is usually much smaller than the overhead of
2267	the actual event loop, only with extremely fast event loops such as EV	2613	the actual event loop, only with extremely fast event loops such as EV
2268	adds AnyEvent significant overhead.	2614	does AnyEvent add significant overhead.
2269		2615
2270	=item * You should avoid POE like the plague if you want performance or	2616	=item * You should avoid POE like the plague if you want performance or
2271	reasonable memory usage.	2617	reasonable memory usage.
2272		2618
2273	=back	2619	=back
…		…
2572		2918
2573	=item L<Time::HiRes>	2919	=item L<Time::HiRes>
2574		2920
2575	This module is part of perl since release 5.008. It will be used when the	2921	This module is part of perl since release 5.008. It will be used when the
2576	chosen event library does not come with a timing source of its own. The	2922	chosen event library does not come with a timing source of its own. The
2577	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to	2923	pure-perl event loop (L<AnyEvent::Loop>) will additionally load it to
2578	try to use a monotonic clock for timing stability.	2924	try to use a monotonic clock for timing stability.
		2925
		2926	=item L<AnyEvent::AIO> (and L<IO::AIO>)
		2927
		2928	The default implementation of L<AnyEvent::IO> is to do I/O synchronously,
		2929	stopping programs while they access the disk, which is fine for a lot of
		2930	programs.
		2931
		2932	Installing AnyEvent::AIO (and its IO::AIO dependency) makes it switch to
		2933	a true asynchronous implementation, so event processing can continue even
		2934	while waiting for disk I/O.
2579		2935
2580	=back	2936	=back
2581		2937
2582		2938
2583	=head1 FORK	2939	=head1 FORK
…		…
2648		3004
2649	Tutorial/Introduction: L<AnyEvent::Intro>.	3005	Tutorial/Introduction: L<AnyEvent::Intro>.
2650		3006
2651	FAQ: L<AnyEvent::FAQ>.	3007	FAQ: L<AnyEvent::FAQ>.
2652		3008
2653	Utility functions: L<AnyEvent::Util>.	3009	Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
		3010	(simply logging).
2654		3011
2655	Event modules: L<EV>, L<EV::Glib>, L<Glib::EV>, L<Event>, L<Glib::Event>,	3012	Development/Debugging: L<AnyEvent::Strict> (stricter checking),
2656	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	3013	L<AnyEvent::Debug> (interactive shell, watcher tracing).
		3014
		3015	Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
		3016	L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
		3017	L<Qt>, L<POE>, L<FLTK>.
2657		3018
2658	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	3019	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2659	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	3020	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2660	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	3021	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2661	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.	3022	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
		3023	L<AnyEvent::Impl::FLTK>.
2662		3024
2663	Non-blocking file handles, sockets, TCP clients and	3025	Non-blocking handles, pipes, stream sockets, TCP clients and
2664	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	3026	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
		3027
		3028	Asynchronous File I/O: L<AnyEvent::IO>.
2665		3029
2666	Asynchronous DNS: L<AnyEvent::DNS>.	3030	Asynchronous DNS: L<AnyEvent::DNS>.
2667		3031
2668	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.	3032	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.
2669		3033
…		…
2672		3036
2673		3037
2674	=head1 AUTHOR	3038	=head1 AUTHOR
2675		3039
2676	Marc Lehmann <schmorp@schmorp.de>	3040	Marc Lehmann <schmorp@schmorp.de>
2677	http://home.schmorp.de/	3041	http://anyevent.schmorp.de
2678		3042
2679	=cut	3043	=cut
2680		3044
2681	1	3045	1
2682		3046

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.343 by root, Wed Dec 29 04:27:53 2010 UTC vs. Revision 1.414 by root, Wed Aug 21 08:40:28 2013 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.343 by root, Wed Dec 29 04:27:53 2010 UTC vs.
Revision 1.414 by root, Wed Aug 21 08:40:28 2013 UTC