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Revision 1.380 by root, Thu Sep 1 04:07:18 2011 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
…		…
15	# file handle or descriptor readable	15	# file handle or descriptor readable
16	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });	16	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });
17		17
18	# one-shot or repeating timers	18	# one-shot or repeating timers
19	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });	19	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });
20	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...	20	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...);
21		21
22	print AnyEvent->now; # prints current event loop time	22	print AnyEvent->now; # prints current event loop time
23	print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.	23	print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.
24		24
25	# POSIX signal	25	# POSIX signal
…		…
46	in a tutorial or some gentle introduction, have a look at the	46	in a tutorial or some gentle introduction, have a look at the
47	L<AnyEvent::Intro> manpage.	47	L<AnyEvent::Intro> manpage.
48		48
49	=head1 SUPPORT	49	=head1 SUPPORT
50		50
		51	An FAQ document is available as L<AnyEvent::FAQ>.
		52
51	There is a mailinglist for discussing all things AnyEvent, and an IRC	53	There also is a mailinglist for discussing all things AnyEvent, and an IRC
52	channel, too.	54	channel, too.
53		55
54	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software	56	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software
55	Repository>, at L<http://anyevent.schmorp.de>, for more info.	57	Repository>, at L<http://anyevent.schmorp.de>, for more info.
56		58
…		…
76	module users into the same thing by forcing them to use the same event	78	module users into the same thing by forcing them to use the same event
77	model you use.	79	model you use.
78		80
79	For modules like POE or IO::Async (which is a total misnomer as it is	81	For modules like POE or IO::Async (which is a total misnomer as it is
80	actually doing all I/O I<synchronously>...), using them in your module is	82	actually doing all I/O I<synchronously>...), using them in your module is
81	like joining a cult: After you joined, you are dependent on them and you	83	like joining a cult: After you join, you are dependent on them and you
82	cannot use anything else, as they are simply incompatible to everything	84	cannot use anything else, as they are simply incompatible to everything
83	that isn't them. What's worse, all the potential users of your	85	that isn't them. What's worse, all the potential users of your
84	module are I<also> forced to use the same event loop you use.	86	module are I<also> forced to use the same event loop you use.
85		87
86	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works	88	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works
87	fine. AnyEvent + Tk works fine etc. etc. but none of these work together	89	fine. AnyEvent + Tk works fine etc. etc. but none of these work together
88	with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if	90	with the rest: POE + EV? No go. Tk + Event? No go. Again: if your module
89	your module uses one of those, every user of your module has to use it,	91	uses one of those, every user of your module has to use it, too. But if
90	too. But if your module uses AnyEvent, it works transparently with all	92	your module uses AnyEvent, it works transparently with all event models it
91	event models it supports (including stuff like IO::Async, as long as those	93	supports (including stuff like IO::Async, as long as those use one of the
92	use one of the supported event loops. It is trivial to add new event loops	94	supported event loops. It is easy to add new event loops to AnyEvent, too,
93	to AnyEvent, too, so it is future-proof).	95	so it is future-proof).
94		96
95	In addition to being free of having to use I<the one and only true event	97	In addition to being free of having to use I<the one and only true event
96	model>, AnyEvent also is free of bloat and policy: with POE or similar	98	model>, AnyEvent also is free of bloat and policy: with POE or similar
97	modules, you get an enormous amount of code and strict rules you have to	99	modules, you get an enormous amount of code and strict rules you have to
98	follow. AnyEvent, on the other hand, is lean and up to the point, by only	100	follow. AnyEvent, on the other hand, is lean and to the point, by only
99	offering the functionality that is necessary, in as thin as a wrapper as	101	offering the functionality that is necessary, in as thin as a wrapper as
100	technically possible.	102	technically possible.
101		103
102	Of course, AnyEvent comes with a big (and fully optional!) toolbox	104	Of course, AnyEvent comes with a big (and fully optional!) toolbox
103	of useful functionality, such as an asynchronous DNS resolver, 100%	105	of useful functionality, such as an asynchronous DNS resolver, 100%
…		…
109	useful) and you want to force your users to use the one and only event	111	useful) and you want to force your users to use the one and only event
110	model, you should I<not> use this module.	112	model, you should I<not> use this module.
111		113
112	=head1 DESCRIPTION	114	=head1 DESCRIPTION
113		115
114	L<AnyEvent> provides an identical interface to multiple event loops. This	116	L<AnyEvent> provides a uniform interface to various event loops. This
115	allows module authors to utilise an event loop without forcing module	117	allows module authors to use event loop functionality without forcing
116	users to use the same event loop (as only a single event loop can coexist	118	module users to use a specific event loop implementation (since more
117	peacefully at any one time).	119	than one event loop cannot coexist peacefully).
118		120
119	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>
120	module.	122	module.
121		123
122	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
123	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
124	following modules is already loaded: L<EV>,	126	following modules is already loaded: L<EV>, L<AnyEvent::Loop>,
125	L<Event>, L<Glib>, L<AnyEvent::Impl::Perl>, L<Tk>, L<Event::Lib>, L<Qt>,	127	L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. The first one
126	L<POE>. The first one found is used. If none are found, the module tries	128	found is used. If none are detected, the module tries to load the first
127	to load these modules (excluding Tk, Event::Lib, Qt and POE as the pure perl	129	four modules in the order given; but note that if L<EV> is not
128	adaptor should always succeed) in the order given. The first one that can	130	available, the pure-perl L<AnyEvent::Loop> should always work, so
129	be successfully loaded will be used. If, after this, still none could be	131	the other two are not normally tried.
130	found, AnyEvent will fall back to a pure-perl event loop, which is not
131	very efficient, but should work everywhere.
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:
136		136
…		…
138	use AnyEvent;	138	use AnyEvent;
139		139
140	# .. AnyEvent will likely default to Tk	140	# .. AnyEvent will likely default to Tk
141		141
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. Maybe you should tell their authors to	143	starts using it, all bets are off - this case should be very rare though,
144	use AnyEvent so their modules work together with others seamlessly...	144	as very few modules hardcode event loops without announcing this very
		145	loudly.
145		146
146	The pure-perl implementation of AnyEvent is called	147	The pure-perl implementation of AnyEvent is called C<AnyEvent::Loop>. Like
147	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
148	explicitly and enjoy the high availability of that event loop :)	149	availability of that event loop :)
149		150
150	=head1 WATCHERS	151	=head1 WATCHERS
151		152
152	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
153	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
…		…
158	callback when the event occurs (of course, only when the event model	159	callback when the event occurs (of course, only when the event model
159	is in control).	160	is in control).
160		161
161	Note that B<callbacks must not permanently change global variables>	162	Note that B<callbacks must not permanently change global variables>
162	potentially in use by the event loop (such as C<$_> or C<$[>) and that B<<	163	potentially in use by the event loop (such as C<$_> or C<$[>) and that B<<
163	callbacks must not C<die> >>. The former is good programming practise in	164	callbacks must not C<die> >>. The former is good programming practice in
164	Perl and the latter stems from the fact that exception handling differs	165	Perl and the latter stems from the fact that exception handling differs
165	widely between event loops.	166	widely between event loops.
166		167
167	To disable the watcher you have to destroy it (e.g. by setting the	168	To disable a watcher you have to destroy it (e.g. by setting the
168	variable you store it in to C<undef> or otherwise deleting all references	169	variable you store it in to C<undef> or otherwise deleting all references
169	to it).	170	to it).
170		171
171	All watchers are created by calling a method on the C<AnyEvent> class.	172	All watchers are created by calling a method on the C<AnyEvent> class.
172		173
173	Many watchers either are used with "recursion" (repeating timers for	174	Many watchers either are used with "recursion" (repeating timers for
174	example), or need to refer to their watcher object in other ways.	175	example), or need to refer to their watcher object in other ways.
175		176
176	An any way to achieve that is this pattern:	177	One way to achieve that is this pattern:
177		178
178	my $w; $w = AnyEvent->type (arg => value ..., cb => sub {	179	my $w; $w = AnyEvent->type (arg => value ..., cb => sub {
179	# you can use $w here, for example to undef it	180	# you can use $w here, for example to undef it
180	undef $w;	181	undef $w;
181	});	182	});
…		…
213		214
214	The I/O watcher might use the underlying file descriptor or a copy of it.	215	The I/O watcher might use the underlying file descriptor or a copy of it.
215	You must not close a file handle as long as any watcher is active on the	216	You must not close a file handle as long as any watcher is active on the
216	underlying file descriptor.	217	underlying file descriptor.
217		218
218	Some event loops issue spurious readyness notifications, so you should	219	Some event loops issue spurious readiness notifications, so you should
219	always use non-blocking calls when reading/writing from/to your file	220	always use non-blocking calls when reading/writing from/to your file
220	handles.	221	handles.
221		222
222	Example: wait for readability of STDIN, then read a line and disable the	223	Example: wait for readability of STDIN, then read a line and disable the
223	watcher.	224	watcher.
…		…
247		248
248	Although the callback might get passed parameters, their value and	249	Although the callback might get passed parameters, their value and
249	presence is undefined and you cannot rely on them. Portable AnyEvent	250	presence is undefined and you cannot rely on them. Portable AnyEvent
250	callbacks cannot use arguments passed to time watcher callbacks.	251	callbacks cannot use arguments passed to time watcher callbacks.
251		252
252	The callback will normally be invoked once only. If you specify another	253	The callback will normally be invoked only once. If you specify another
253	parameter, C<interval>, as a strictly positive number (> 0), then the	254	parameter, C<interval>, as a strictly positive number (> 0), then the
254	callback will be invoked regularly at that interval (in fractional	255	callback will be invoked regularly at that interval (in fractional
255	seconds) after the first invocation. If C<interval> is specified with a	256	seconds) after the first invocation. If C<interval> is specified with a
256	false value, then it is treated as if it were missing.	257	false value, then it is treated as if it were not specified at all.
257		258
258	The callback will be rescheduled before invoking the callback, but no	259	The callback will be rescheduled before invoking the callback, but no
259	attempt is done to avoid timer drift in most backends, so the interval is	260	attempt is made to avoid timer drift in most backends, so the interval is
260	only approximate.	261	only approximate.
261		262
262	Example: fire an event after 7.7 seconds.	263	Example: fire an event after 7.7 seconds.
263		264
264	my $w = AnyEvent->timer (after => 7.7, cb => sub {	265	my $w = AnyEvent->timer (after => 7.7, cb => sub {
…		…
282		283
283	While most event loops expect timers to specified in a relative way, they	284	While most event loops expect timers to specified in a relative way, they
284	use absolute time internally. This makes a difference when your clock	285	use absolute time internally. This makes a difference when your clock
285	"jumps", for example, when ntp decides to set your clock backwards from	286	"jumps", for example, when ntp decides to set your clock backwards from
286	the wrong date of 2014-01-01 to 2008-01-01, a watcher that is supposed to	287	the wrong date of 2014-01-01 to 2008-01-01, a watcher that is supposed to
287	fire "after" a second might actually take six years to finally fire.	288	fire "after a second" might actually take six years to finally fire.
288		289
289	AnyEvent cannot compensate for this. The only event loop that is conscious	290	AnyEvent cannot compensate for this. The only event loop that is conscious
290	about these issues is L<EV>, which offers both relative (ev_timer, based	291	of these issues is L<EV>, which offers both relative (ev_timer, based
291	on true relative time) and absolute (ev_periodic, based on wallclock time)	292	on true relative time) and absolute (ev_periodic, based on wallclock time)
292	timers.	293	timers.
293		294
294	AnyEvent always prefers relative timers, if available, matching the	295	AnyEvent always prefers relative timers, if available, matching the
295	AnyEvent API.	296	AnyEvent API.
…		…
317	I<In almost all cases (in all cases if you don't care), this is the	318	I<In almost all cases (in all cases if you don't care), this is the
318	function to call when you want to know the current time.>	319	function to call when you want to know the current time.>
319		320
320	This function is also often faster then C<< AnyEvent->time >>, and	321	This function is also often faster then C<< AnyEvent->time >>, and
321	thus the preferred method if you want some timestamp (for example,	322	thus the preferred method if you want some timestamp (for example,
322	L<AnyEvent::Handle> uses this to update it's activity timeouts).	323	L<AnyEvent::Handle> uses this to update its activity timeouts).
323		324
324	The rest of this section is only of relevance if you try to be very exact	325	The rest of this section is only of relevance if you try to be very exact
325	with your timing, you can skip it without bad conscience.	326	with your timing; you can skip it without a bad conscience.
326		327
327	For a practical example of when these times differ, consider L<Event::Lib>	328	For a practical example of when these times differ, consider L<Event::Lib>
328	and L<EV> and the following set-up:	329	and L<EV> and the following set-up:
329		330
330	The event loop is running and has just invoked one of your callback at	331	The event loop is running and has just invoked one of your callbacks at
331	time=500 (assume no other callbacks delay processing). In your callback,	332	time=500 (assume no other callbacks delay processing). In your callback,
332	you wait a second by executing C<sleep 1> (blocking the process for a	333	you wait a second by executing C<sleep 1> (blocking the process for a
333	second) and then (at time=501) you create a relative timer that fires	334	second) and then (at time=501) you create a relative timer that fires
334	after three seconds.	335	after three seconds.
335		336
…		…
355	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into	356	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into
356	account.	357	account.
357		358
358	=item AnyEvent->now_update	359	=item AnyEvent->now_update
359		360
360	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
361	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 >>,
362	AnyEvent->now >>, above).	363	above).
363		364
364	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
365	this "current" time will differ substantially from the real time, which	366	this "current" time will differ substantially from the real time, which
366	might affect timers and time-outs.	367	might affect timers and time-outs.
367		368
…		…
428	=head3 Signal Races, Delays and Workarounds	429	=head3 Signal Races, Delays and Workarounds
429		430
430	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 attaching
431	callbacks to signals in a generic way, which is a pity, as you cannot	432	callbacks to signals in a generic way, which is a pity, as you cannot
432	do race-free signal handling in perl, requiring C libraries for	433	do race-free signal handling in perl, requiring C libraries for
433	this. AnyEvent will try to do it's best, which means in some cases,	434	this. AnyEvent will try to do its best, which means in some cases,
434	signals will be delayed. The maximum time a signal might be delayed is	435	signals will be delayed. The maximum time a signal might be delayed is
435	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This	436	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This
436	variable can be changed only before the first signal watcher is created,	437	variable can be changed only before the first signal watcher is created,
437	and should be left alone otherwise. This variable determines how often	438	and should be left alone otherwise. This variable determines how often
438	AnyEvent polls for signals (in case a wake-up was missed). Higher values	439	AnyEvent polls for signals (in case a wake-up was missed). Higher values
…		…
440	saving.	441	saving.
441		442
442	All these problems can be avoided by installing the optional	443	All these problems can be avoided by installing the optional
443	L<Async::Interrupt> module, which works with most event loops. It will not	444	L<Async::Interrupt> module, which works with most event loops. It will not
444	work with inherently broken event loops such as L<Event> or L<Event::Lib>	445	work with inherently broken event loops such as L<Event> or L<Event::Lib>
445	(and not with L<POE> currently, as POE does it's own workaround with	446	(and not with L<POE> currently, as POE does its own workaround with
446	one-second latency). For those, you just have to suffer the delays.	447	one-second latency). For those, you just have to suffer the delays.
447		448
448	=head2 CHILD PROCESS WATCHERS	449	=head2 CHILD PROCESS WATCHERS
449		450
450	$w = AnyEvent->child (pid => <process id>, cb => <callback>);	451	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
451		452
452	You can also watch on a child process exit and catch its exit status.	453	You can also watch for a child process exit and catch its exit status.
453		454
454	The child process is specified by the C<pid> argument (one some backends,	455	The child process is specified by the C<pid> argument (on some backends,
455	using C<0> watches for any child process exit, on others this will	456	using C<0> watches for any child process exit, on others this will
456	croak). The watcher will be triggered only when the child process has	457	croak). The watcher will be triggered only when the child process has
457	finished and an exit status is available, not on any trace events	458	finished and an exit status is available, not on any trace events
458	(stopped/continued).	459	(stopped/continued).
459		460
…		…
481	thing in an AnyEvent program, you I<have> to create at least one	482	thing in an AnyEvent program, you I<have> to create at least one
482	watcher before you C<fork> the child (alternatively, you can call	483	watcher before you C<fork> the child (alternatively, you can call
483	C<AnyEvent::detect>).	484	C<AnyEvent::detect>).
484		485
485	As most event loops do not support waiting for child events, they will be	486	As most event loops do not support waiting for child events, they will be
486	emulated by AnyEvent in most cases, in which the latency and race problems	487	emulated by AnyEvent in most cases, in which case the latency and race
487	mentioned in the description of signal watchers apply.	488	problems mentioned in the description of signal watchers apply.
488		489
489	Example: fork a process and wait for it	490	Example: fork a process and wait for it
490		491
491	my $done = AnyEvent->condvar;	492	my $done = AnyEvent->condvar;
492		493
…		…
506		507
507	=head2 IDLE WATCHERS	508	=head2 IDLE WATCHERS
508		509
509	$w = AnyEvent->idle (cb => <callback>);	510	$w = AnyEvent->idle (cb => <callback>);
510		511
511	Repeatedly invoke the callback after the process becomes idle, until	512	This will repeatedly invoke the callback after the process becomes idle,
512	either the watcher is destroyed or new events have been detected.	513	until either the watcher is destroyed or new events have been detected.
513		514
514	Idle watchers are useful when there is a need to do something, but it	515	Idle watchers are useful when there is a need to do something, but it
515	is not so important (or wise) to do it instantly. The callback will be	516	is not so important (or wise) to do it instantly. The callback will be
516	invoked only when there is "nothing better to do", which is usually	517	invoked only when there is "nothing better to do", which is usually
517	defined as "all outstanding events have been handled and no new events	518	defined as "all outstanding events have been handled and no new events
…		…
556	will actively watch for new events and call your callbacks.	557	will actively watch for new events and call your callbacks.
557		558
558	AnyEvent is slightly different: it expects somebody else to run the event	559	AnyEvent is slightly different: it expects somebody else to run the event
559	loop and will only block when necessary (usually when told by the user).	560	loop and will only block when necessary (usually when told by the user).
560		561
561	The instrument to do that is called a "condition variable", so called	562	The tool to do that is called a "condition variable", so called because
562	because they represent a condition that must become true.	563	they represent a condition that must become true.
563		564
564	Now is probably a good time to look at the examples further below.	565	Now is probably a good time to look at the examples further below.
565		566
566	Condition variables can be created by calling the C<< AnyEvent->condvar	567	Condition variables can be created by calling the C<< AnyEvent->condvar
567	>> method, usually without arguments. The only argument pair allowed is	568	>> method, usually without arguments. The only argument pair allowed is
…		…
572	After creation, the condition variable is "false" until it becomes "true"	573	After creation, the condition variable is "false" until it becomes "true"
573	by calling the C<send> method (or calling the condition variable as if it	574	by calling the C<send> method (or calling the condition variable as if it
574	were a callback, read about the caveats in the description for the C<<	575	were a callback, read about the caveats in the description for the C<<
575	->send >> method).	576	->send >> method).
576		577
577	Condition variables are similar to callbacks, except that you can	578	Since condition variables are the most complex part of the AnyEvent API, here are
578	optionally wait for them. They can also be called merge points - points	579	some different mental models of what they are - pick the ones you can connect to:
579	in time where multiple outstanding events have been processed. And yet	580
580	another way to call them is transactions - each condition variable can be	581	=over 4
581	used to represent a transaction, which finishes at some point and delivers	582
582	a result. And yet some people know them as "futures" - a promise to	583	=item * Condition variables are like callbacks - you can call them (and pass them instead
583	compute/deliver something that you can wait for.	584	of callbacks). Unlike callbacks however, you can also wait for them to be called.
		585
		586	=item * Condition variables are signals - one side can emit or send them,
		587	the other side can wait for them, or install a handler that is called when
		588	the signal fires.
		589
		590	=item * Condition variables are like "Merge Points" - points in your program
		591	where you merge multiple independent results/control flows into one.
		592
		593	=item * Condition variables represent a transaction - functions that start
		594	some kind of transaction can return them, leaving the caller the choice
		595	between waiting in a blocking fashion, or setting a callback.
		596
		597	=item * Condition variables represent future values, or promises to deliver
		598	some result, long before the result is available.
		599
		600	=back
584		601
585	Condition variables are very useful to signal that something has finished,	602	Condition variables are very useful to signal that something has finished,
586	for example, if you write a module that does asynchronous http requests,	603	for example, if you write a module that does asynchronous http requests,
587	then a condition variable would be the ideal candidate to signal the	604	then a condition variable would be the ideal candidate to signal the
588	availability of results. The user can either act when the callback is	605	availability of results. The user can either act when the callback is
…		…
601		618
602	Condition variables are represented by hash refs in perl, and the keys	619	Condition variables are represented by hash refs in perl, and the keys
603	used by AnyEvent itself are all named C<_ae_XXX> to make subclassing	620	used by AnyEvent itself are all named C<_ae_XXX> to make subclassing
604	easy (it is often useful to build your own transaction class on top of	621	easy (it is often useful to build your own transaction class on top of
605	AnyEvent). To subclass, use C<AnyEvent::CondVar> as base class and call	622	AnyEvent). To subclass, use C<AnyEvent::CondVar> as base class and call
606	it's C<new> method in your own C<new> method.	623	its C<new> method in your own C<new> method.
607		624
608	There are two "sides" to a condition variable - the "producer side" which	625	There are two "sides" to a condition variable - the "producer side" which
609	eventually calls C<< -> send >>, and the "consumer side", which waits	626	eventually calls C<< -> send >>, and the "consumer side", which waits
610	for the send to occur.	627	for the send to occur.
611		628
…		…
676	they were a code reference). Calling them directly is the same as calling	693	they were a code reference). Calling them directly is the same as calling
677	C<send>.	694	C<send>.
678		695
679	=item $cv->croak ($error)	696	=item $cv->croak ($error)
680		697
681	Similar to send, but causes all call's to C<< ->recv >> to invoke	698	Similar to send, but causes all calls to C<< ->recv >> to invoke
682	C<Carp::croak> with the given error message/object/scalar.	699	C<Carp::croak> with the given error message/object/scalar.
683		700
684	This can be used to signal any errors to the condition variable	701	This can be used to signal any errors to the condition variable
685	user/consumer. Doing it this way instead of calling C<croak> directly	702	user/consumer. Doing it this way instead of calling C<croak> directly
686	delays the error detetcion, but has the overwhelmign advantage that it	703	delays the error detection, but has the overwhelming advantage that it
687	diagnoses the error at the place where the result is expected, and not	704	diagnoses the error at the place where the result is expected, and not
688	deep in some event clalback without connection to the actual code causing	705	deep in some event callback with no connection to the actual code causing
689	the problem.	706	the problem.
690		707
691	=item $cv->begin ([group callback])	708	=item $cv->begin ([group callback])
692		709
693	=item $cv->end	710	=item $cv->end
…		…
731	one call to C<begin>, so the condvar waits for all calls to C<end> before	748	one call to C<begin>, so the condvar waits for all calls to C<end> before
732	sending.	749	sending.
733		750
734	The ping example mentioned above is slightly more complicated, as the	751	The ping example mentioned above is slightly more complicated, as the
735	there are results to be passwd back, and the number of tasks that are	752	there are results to be passwd back, and the number of tasks that are
736	begung can potentially be zero:	753	begun can potentially be zero:
737		754
738	my $cv = AnyEvent->condvar;	755	my $cv = AnyEvent->condvar;
739		756
740	my %result;	757	my %result;
741	$cv->begin (sub { shift->send (\%result) });	758	$cv->begin (sub { shift->send (\%result) });
…		…
762	to be called once the counter reaches C<0>, and second, it ensures that	779	to be called once the counter reaches C<0>, and second, it ensures that
763	C<send> is called even when C<no> hosts are being pinged (the loop	780	C<send> is called even when C<no> hosts are being pinged (the loop
764	doesn't execute once).	781	doesn't execute once).
765		782
766	This is the general pattern when you "fan out" into multiple (but	783	This is the general pattern when you "fan out" into multiple (but
767	potentially none) subrequests: use an outer C<begin>/C<end> pair to set	784	potentially zero) subrequests: use an outer C<begin>/C<end> pair to set
768	the callback and ensure C<end> is called at least once, and then, for each	785	the callback and ensure C<end> is called at least once, and then, for each
769	subrequest you start, call C<begin> and for each subrequest you finish,	786	subrequest you start, call C<begin> and for each subrequest you finish,
770	call C<end>.	787	call C<end>.
771		788
772	=back	789	=back
…		…
779	=over 4	796	=over 4
780		797
781	=item $cv->recv	798	=item $cv->recv
782		799
783	Wait (blocking if necessary) until the C<< ->send >> or C<< ->croak	800	Wait (blocking if necessary) until the C<< ->send >> or C<< ->croak
784	>> methods have been called on c<$cv>, while servicing other watchers	801	>> methods have been called on C<$cv>, while servicing other watchers
785	normally.	802	normally.
786		803
787	You can only wait once on a condition - additional calls are valid but	804	You can only wait once on a condition - additional calls are valid but
788	will return immediately.	805	will return immediately.
789		806
…		…
806	caller decide whether the call will block or not (for example, by coupling	823	caller decide whether the call will block or not (for example, by coupling
807	condition variables with some kind of request results and supporting	824	condition variables with some kind of request results and supporting
808	callbacks so the caller knows that getting the result will not block,	825	callbacks so the caller knows that getting the result will not block,
809	while still supporting blocking waits if the caller so desires).	826	while still supporting blocking waits if the caller so desires).
810		827
811	You can ensure that C<< -recv >> never blocks by setting a callback and	828	You can ensure that C<< ->recv >> never blocks by setting a callback and
812	only calling C<< ->recv >> from within that callback (or at a later	829	only calling C<< ->recv >> from within that callback (or at a later
813	time). This will work even when the event loop does not support blocking	830	time). This will work even when the event loop does not support blocking
814	waits otherwise.	831	waits otherwise.
815		832
816	=item $bool = $cv->ready	833	=item $bool = $cv->ready
…		…
821	=item $cb = $cv->cb ($cb->($cv))	838	=item $cb = $cv->cb ($cb->($cv))
822		839
823	This is a mutator function that returns the callback set and optionally	840	This is a mutator function that returns the callback set and optionally
824	replaces it before doing so.	841	replaces it before doing so.
825		842
826	The callback will be called when the condition becomes (or already was)	843	The callback will be called when the condition becomes "true", i.e. when
827	"true", i.e. when C<send> or C<croak> are called (or were called), with	844	C<send> or C<croak> are called, with the only argument being the
828	the only argument being the condition variable itself. Calling C<recv>	845	condition variable itself. If the condition is already true, the
		846	callback is called immediately when it is set. Calling C<recv> inside
829	inside the callback or at any later time is guaranteed not to block.	847	the callback or at any later time is guaranteed not to block.
830		848
831	=back	849	=back
832		850
833	=head1 SUPPORTED EVENT LOOPS/BACKENDS	851	=head1 SUPPORTED EVENT LOOPS/BACKENDS
834		852
…		…
842	use. If EV is not installed, then AnyEvent will fall back to its own	860	use. If EV is not installed, then AnyEvent will fall back to its own
843	pure-perl implementation, which is available everywhere as it comes with	861	pure-perl implementation, which is available everywhere as it comes with
844	AnyEvent itself.	862	AnyEvent itself.
845		863
846	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	864	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
847	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	865	AnyEvent::Impl::Perl pure-perl AnyEvent::Loop, fast and portable.
848		866
849	=item Backends that are transparently being picked up when they are used.	867	=item Backends that are transparently being picked up when they are used.
850		868
851	These will be used when they are currently loaded when the first watcher	869	These will be used if they are already loaded when the first watcher
852	is created, in which case it is assumed that the application is using	870	is created, in which case it is assumed that the application is using
853	them. This means that AnyEvent will automatically pick the right backend	871	them. This means that AnyEvent will automatically pick the right backend
854	when the main program loads an event module before anything starts to	872	when the main program loads an event module before anything starts to
855	create watchers. Nothing special needs to be done by the main program.	873	create watchers. Nothing special needs to be done by the main program.
856		874
…		…
858	AnyEvent::Impl::Glib based on Glib, slow but very stable.	876	AnyEvent::Impl::Glib based on Glib, slow but very stable.
859	AnyEvent::Impl::Tk based on Tk, very broken.	877	AnyEvent::Impl::Tk based on Tk, very broken.
860	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	878	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
861	AnyEvent::Impl::POE based on POE, very slow, some limitations.	879	AnyEvent::Impl::POE based on POE, very slow, some limitations.
862	AnyEvent::Impl::Irssi used when running within irssi.	880	AnyEvent::Impl::Irssi used when running within irssi.
		881	AnyEvent::Impl::IOAsync based on IO::Async.
		882	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
		883	AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
863		884
864	=item Backends with special needs.	885	=item Backends with special needs.
865		886
866	Qt requires the Qt::Application to be instantiated first, but will	887	Qt requires the Qt::Application to be instantiated first, but will
867	otherwise be picked up automatically. As long as the main program	888	otherwise be picked up automatically. As long as the main program
868	instantiates the application before any AnyEvent watchers are created,	889	instantiates the application before any AnyEvent watchers are created,
869	everything should just work.	890	everything should just work.
870		891
871	AnyEvent::Impl::Qt based on Qt.	892	AnyEvent::Impl::Qt based on Qt.
872		893
873	Support for IO::Async can only be partial, as it is too broken and
874	architecturally limited to even support the AnyEvent API. It also
875	is the only event loop that needs the loop to be set explicitly, so
876	it can only be used by a main program knowing about AnyEvent. See
877	L<AnyEvent::Impl::Async> for the gory details.
878
879	AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed.
880
881	=item Event loops that are indirectly supported via other backends.	894	=item Event loops that are indirectly supported via other backends.
882		895
883	Some event loops can be supported via other modules:	896	Some event loops can be supported via other modules:
884		897
885	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.	898	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.
…		…
910	Contains C<undef> until the first watcher is being created, before the	923	Contains C<undef> until the first watcher is being created, before the
911	backend has been autodetected.	924	backend has been autodetected.
912		925
913	Afterwards it contains the event model that is being used, which is the	926	Afterwards it contains the event model that is being used, which is the
914	name of the Perl class implementing the model. This class is usually one	927	name of the Perl class implementing the model. This class is usually one
915	of the C<AnyEvent::Impl:xxx> modules, but can be any other class in the	928	of the C<AnyEvent::Impl::xxx> modules, but can be any other class in the
916	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it	929	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it
917	will be C<urxvt::anyevent>).	930	will be C<urxvt::anyevent>).
918		931
919	=item AnyEvent::detect	932	=item AnyEvent::detect
920		933
921	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	934	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
922	if necessary. You should only call this function right before you would	935	if necessary. You should only call this function right before you would
923	have created an AnyEvent watcher anyway, that is, as late as possible at	936	have created an AnyEvent watcher anyway, that is, as late as possible at
924	runtime, and not e.g. while initialising of your module.	937	runtime, and not e.g. during initialisation of your module.
		938
		939	The effect of calling this function is as if a watcher had been created
		940	(specifically, actions that happen "when the first watcher is created"
		941	happen when calling detetc as well).
925		942
926	If you need to do some initialisation before AnyEvent watchers are	943	If you need to do some initialisation before AnyEvent watchers are
927	created, use C<post_detect>.	944	created, use C<post_detect>.
928		945
929	=item $guard = AnyEvent::post_detect { BLOCK }	946	=item $guard = AnyEvent::post_detect { BLOCK }
930		947
931	Arranges for the code block to be executed as soon as the event model is	948	Arranges for the code block to be executed as soon as the event model is
932	autodetected (or immediately if this has already happened).	949	autodetected (or immediately if that has already happened).
933		950
934	The block will be executed I<after> the actual backend has been detected	951	The block will be executed I<after> the actual backend has been detected
935	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been	952	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been
936	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do	953	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do
937	other initialisations - see the sources of L<AnyEvent::Strict> or	954	other initialisations - see the sources of L<AnyEvent::Strict> or
…		…
946	that automatically removes the callback again when it is destroyed (or	963	that automatically removes the callback again when it is destroyed (or
947	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for	964	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for
948	a case where this is useful.	965	a case where this is useful.
949		966
950	Example: Create a watcher for the IO::AIO module and store it in	967	Example: Create a watcher for the IO::AIO module and store it in
951	C<$WATCHER>. Only do so after the event loop is initialised, though.	968	C<$WATCHER>, but do so only do so after the event loop is initialised.
952		969
953	our WATCHER;	970	our WATCHER;
954		971
955	my $guard = AnyEvent::post_detect {	972	my $guard = AnyEvent::post_detect {
956	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);	973	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);
…		…
964	$WATCHER ||= $guard;	981	$WATCHER ||= $guard;
965		982
966	=item @AnyEvent::post_detect	983	=item @AnyEvent::post_detect
967		984
968	If there are any code references in this array (you can C<push> to it	985	If there are any code references in this array (you can C<push> to it
969	before or after loading AnyEvent), then they will called directly after	986	before or after loading AnyEvent), then they will be called directly
970	the event loop has been chosen.	987	after the event loop has been chosen.
971		988
972	You should check C<$AnyEvent::MODEL> before adding to this array, though:	989	You should check C<$AnyEvent::MODEL> before adding to this array, though:
973	if it is defined then the event loop has already been detected, and the	990	if it is defined then the event loop has already been detected, and the
974	array will be ignored.	991	array will be ignored.
975		992
…		…
992	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent	1009	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
993	# as soon as it is	1010	# as soon as it is
994	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };	1011	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
995	}	1012	}
996		1013
		1014	=item AnyEvent::postpone { BLOCK }
		1015
		1016	Arranges for the block to be executed as soon as possible, but not before
		1017	the call itself returns. In practise, the block will be executed just
		1018	before the event loop polls for new events, or shortly afterwards.
		1019
		1020	This function never returns anything (to make the C<return postpone { ...
		1021	}> idiom more useful.
		1022
		1023	To understand the usefulness of this function, consider a function that
		1024	asynchronously does something for you and returns some transaction
		1025	object or guard to let you cancel the operation. For example,
		1026	C<AnyEvent::Socket::tcp_connect>:
		1027
		1028	# start a conenction attempt unless one is active
		1029	$self->{connect_guard} ||= AnyEvent::Socket::tcp_connect "www.example.net", 80, sub {
		1030	delete $self->{connect_guard};
		1031	...
		1032	};
		1033
		1034	Imagine that this function could instantly call the callback, for
		1035	example, because it detects an obvious error such as a negative port
		1036	number. Invoking the callback before the function returns causes problems
		1037	however: the callback will be called and will try to delete the guard
		1038	object. But since the function hasn't returned yet, there is nothing to
		1039	delete. When the function eventually returns it will assign the guard
		1040	object to C<< $self->{connect_guard} >>, where it will likely never be
		1041	deleted, so the program thinks it is still trying to connect.
		1042
		1043	This is where C<AnyEvent::postpone> should be used. Instead of calling the
		1044	callback directly on error:
		1045
		1046	$cb->(undef), return # signal error to callback, BAD!
		1047	if $some_error_condition;
		1048
		1049	It should use C<postpone>:
		1050
		1051	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
		1052	if $some_error_condition;
		1053
		1054	=item AnyEvent::log $level, $msg[, @args]
		1055
		1056	Log the given C<$msg> at the given C<$level>.
		1057
		1058	If L<AnyEvent::Log> is not loaded then this function makes a simple test
		1059	to see whether the message will be logged. If the test succeeds it will
		1060	load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
		1061	the L<AnyEvent::Log> documentation for details.
		1062
		1063	If the test fails it will simply return. Right now this happens when a
		1064	numerical loglevel is used and it is larger than the level specified via
		1065	C<$ENV{PERL_ANYEVENT_VERBOSE}>.
		1066
		1067	If you want to sprinkle loads of logging calls around your code, consider
		1068	creating a logger callback with the C<AnyEvent::Log::logger> function,
		1069	which can reduce typing, codesize and can reduce the logging overhead
		1070	enourmously.
		1071
997	=back	1072	=back
998		1073
999	=head1 WHAT TO DO IN A MODULE	1074	=head1 WHAT TO DO IN A MODULE
1000		1075
1001	As a module author, you should C<use AnyEvent> and call AnyEvent methods	1076	As a module author, you should C<use AnyEvent> and call AnyEvent methods
…		…
1011	because it will stall the whole program, and the whole point of using	1086	because it will stall the whole program, and the whole point of using
1012	events is to stay interactive.	1087	events is to stay interactive.
1013		1088
1014	It is fine, however, to call C<< ->recv >> when the user of your module	1089	It is fine, however, to call C<< ->recv >> when the user of your module
1015	requests it (i.e. if you create a http request object ad have a method	1090	requests it (i.e. if you create a http request object ad have a method
1016	called C<results> that returns the results, it should call C<< ->recv >>	1091	called C<results> that returns the results, it may call C<< ->recv >>
1017	freely, as the user of your module knows what she is doing. always).	1092	freely, as the user of your module knows what she is doing. Always).
1018		1093
1019	=head1 WHAT TO DO IN THE MAIN PROGRAM	1094	=head1 WHAT TO DO IN THE MAIN PROGRAM
1020		1095
1021	There will always be a single main program - the only place that should	1096	There will always be a single main program - the only place that should
1022	dictate which event model to use.	1097	dictate which event model to use.
1023		1098
1024	If it doesn't care, it can just "use AnyEvent" and use it itself, or not	1099	If the program is not event-based, it need not do anything special, even
1025	do anything special (it does not need to be event-based) and let AnyEvent	1100	when it depends on a module that uses an AnyEvent. If the program itself
1026	decide which implementation to chose if some module relies on it.	1101	uses AnyEvent, but does not care which event loop is used, all it needs
		1102	to do is C<use AnyEvent>. In either case, AnyEvent will choose the best
		1103	available loop implementation.
1027		1104
1028	If the main program relies on a specific event model - for example, in	1105	If the main program relies on a specific event model - for example, in
1029	Gtk2 programs you have to rely on the Glib module - you should load the	1106	Gtk2 programs you have to rely on the Glib module - you should load the
1030	event module before loading AnyEvent or any module that uses it: generally	1107	event module before loading AnyEvent or any module that uses it: generally
1031	speaking, you should load it as early as possible. The reason is that	1108	speaking, you should load it as early as possible. The reason is that
1032	modules might create watchers when they are loaded, and AnyEvent will	1109	modules might create watchers when they are loaded, and AnyEvent will
1033	decide on the event model to use as soon as it creates watchers, and it	1110	decide on the event model to use as soon as it creates watchers, and it
1034	might chose the wrong one unless you load the correct one yourself.	1111	might choose the wrong one unless you load the correct one yourself.
1035		1112
1036	You can chose to use a pure-perl implementation by loading the	1113	You can chose to use a pure-perl implementation by loading the
1037	C<AnyEvent::Impl::Perl> module, which gives you similar behaviour	1114	C<AnyEvent::Loop> module, which gives you similar behaviour
1038	everywhere, but letting AnyEvent chose the model is generally better.	1115	everywhere, but letting AnyEvent chose the model is generally better.
1039		1116
1040	=head2 MAINLOOP EMULATION	1117	=head2 MAINLOOP EMULATION
1041		1118
1042	Sometimes (often for short test scripts, or even standalone programs who	1119	Sometimes (often for short test scripts, or even standalone programs who
…		…
1055		1132
1056		1133
1057	=head1 OTHER MODULES	1134	=head1 OTHER MODULES
1058		1135
1059	The following is a non-exhaustive list of additional modules that use	1136	The following is a non-exhaustive list of additional modules that use
1060	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1137	AnyEvent as a client and can therefore be mixed easily with other
1061	modules and other event loops in the same program. Some of the modules	1138	AnyEvent modules and other event loops in the same program. Some of the
1062	come with AnyEvent, most are available via CPAN.	1139	modules come as part of AnyEvent, the others are available via CPAN (see
		1140	L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
		1141	a longer non-exhaustive list), and the list is heavily biased towards
		1142	modules of the AnyEvent author himself :)
1063		1143
1064	=over 4	1144	=over 4
1065		1145
1066	=item L<AnyEvent::Util>	1146	=item L<AnyEvent::Util>
1067		1147
1068	Contains various utility functions that replace often-used but blocking	1148	Contains various utility functions that replace often-used blocking
1069	functions such as C<inet_aton> by event-/callback-based versions.	1149	functions such as C<inet_aton> with event/callback-based versions.
1070		1150
1071	=item L<AnyEvent::Socket>	1151	=item L<AnyEvent::Socket>
1072		1152
1073	Provides various utility functions for (internet protocol) sockets,	1153	Provides various utility functions for (internet protocol) sockets,
1074	addresses and name resolution. Also functions to create non-blocking tcp	1154	addresses and name resolution. Also functions to create non-blocking tcp
…		…
1076		1156
1077	=item L<AnyEvent::Handle>	1157	=item L<AnyEvent::Handle>
1078		1158
1079	Provide read and write buffers, manages watchers for reads and writes,	1159	Provide read and write buffers, manages watchers for reads and writes,
1080	supports raw and formatted I/O, I/O queued and fully transparent and	1160	supports raw and formatted I/O, I/O queued and fully transparent and
1081	non-blocking SSL/TLS (via L<AnyEvent::TLS>.	1161	non-blocking SSL/TLS (via L<AnyEvent::TLS>).
1082		1162
1083	=item L<AnyEvent::DNS>	1163	=item L<AnyEvent::DNS>
1084		1164
1085	Provides rich asynchronous DNS resolver capabilities.	1165	Provides rich asynchronous DNS resolver capabilities.
1086		1166
1087	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>	1167	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1088		1168
1089	Implement event-based interfaces to the protocols of the same name (for	1169	Implement event-based interfaces to the protocols of the same name (for
1090	the curious, IGS is the International Go Server and FCP is the Freenet	1170	the curious, IGS is the International Go Server and FCP is the Freenet
1091	Client Protocol).	1171	Client Protocol).
1092
1093	=item L<AnyEvent::Handle::UDP>
1094
1095	Here be danger!
1096
1097	As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1098	there are so many things wrong with AnyEvent::Handle::UDP, most notably
1099	it's use of a stream-based API with a protocol that isn't streamable, that
1100	the only way to improve it is to delete it.
1101
1102	It features data corruption (but typically only under load) and general
1103	confusion. On top, the author is not only clueless about UDP but also
1104	fact-resistant - some gems of his understanding: "connect doesn't work
1105	with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1106	packets", "I don't need to implement proper error checking as UDP doesn't
1107	support error checking" and so on - he doesn't even understand what's
1108	wrong with his module when it is explained to him.
1109
1110	=item L<AnyEvent::DBI>
1111
1112	Executes L<DBI> requests asynchronously in a proxy process for you,
1113	notifying you in an event-bnased way when the operation is finished.
1114		1172
1115	=item L<AnyEvent::AIO>	1173	=item L<AnyEvent::AIO>
1116		1174
1117	Truly asynchronous (as opposed to non-blocking) I/O, should be in the	1175	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1118	toolbox of every event programmer. AnyEvent::AIO transparently fuses	1176	toolbox of every event programmer. AnyEvent::AIO transparently fuses
1119	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based	1177	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1120	file I/O, and much more.	1178	file I/O, and much more.
1121		1179
		1180	=item L<AnyEvent::Filesys::Notify>
		1181
		1182	AnyEvent is good for non-blocking stuff, but it can't detect file or
		1183	path changes (e.g. "watch this directory for new files", "watch this
		1184	file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
		1185	do just that in a portbale fashion, supporting inotify on GNU/Linux and
		1186	some weird, without doubt broken, stuff on OS X to monitor files. It can
		1187	fall back to blocking scans at regular intervals transparently on other
		1188	platforms, so it's about as portable as it gets.
		1189
		1190	(I haven't used it myself, but I haven't heard anybody complaining about
		1191	it yet).
		1192
		1193	=item L<AnyEvent::DBI>
		1194
		1195	Executes L<DBI> requests asynchronously in a proxy process for you,
		1196	notifying you in an event-based way when the operation is finished.
		1197
1122	=item L<AnyEvent::HTTPD>	1198	=item L<AnyEvent::HTTPD>
1123		1199
1124	A simple embedded webserver.	1200	A simple embedded webserver.
1125		1201
1126	=item L<AnyEvent::FastPing>	1202	=item L<AnyEvent::FastPing>
1127		1203
1128	The fastest ping in the west.	1204	The fastest ping in the west.
1129		1205
1130	=item L<Coro>	1206	=item L<Coro>
1131		1207
1132	Has special support for AnyEvent via L<Coro::AnyEvent>.	1208	Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
		1209	to simply invert the flow control - don't call us, we will call you:
		1210
		1211	async {
		1212	Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
		1213	print "5 seconds later!\n";
		1214
		1215	Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
		1216	my $line = <STDIN>; # works for ttys
		1217
		1218	AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
		1219	my ($body, $hdr) = Coro::rouse_wait;
		1220	};
1133		1221
1134	=back	1222	=back
1135		1223
1136	=cut	1224	=cut
1137		1225
1138	package AnyEvent;	1226	package AnyEvent;
1139		1227
1140	# basically a tuned-down version of common::sense	1228	# basically a tuned-down version of common::sense
1141	sub common_sense {	1229	sub common_sense {
1142	# from common:.sense 1.0	1230	# from common:.sense 3.4
1143	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";	1231	${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf0\x0f\xc0\xf0\xfc\x33\x00";
1144	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)	1232	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1145	$^H |= 0x00000600;	1233	$^H |= 0x00000600;
1146	}	1234	}
1147		1235
1148	BEGIN { AnyEvent::common_sense }	1236	BEGIN { AnyEvent::common_sense }
1149		1237
1150	use Carp ();	1238	use Carp ();
1151		1239
1152	our $VERSION = '5.261';	1240	our $VERSION = '6.02';
1153	our $MODEL;	1241	our $MODEL;
1154		1242
1155	our $AUTOLOAD;
1156	our @ISA;	1243	our @ISA;
1157		1244
1158	our @REGISTRY;	1245	our @REGISTRY;
1159		1246
1160	our $VERBOSE;	1247	our $VERBOSE;
…		…
1165	eval "sub TAINT (){" . (${^TAINT}*1) . "}";	1252	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1166		1253
1167	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1254	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1168	if ${^TAINT};	1255	if ${^TAINT};
1169		1256
1170	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1257	$ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
		1258	for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1171		1259
		1260	@ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
		1261	if ${^TAINT};
		1262
		1263	$VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 3;
1172	}	1264	}
1173		1265
1174	our $MAX_SIGNAL_LATENCY = 10;	1266	our $MAX_SIGNAL_LATENCY = 10;
1175		1267
1176	our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred	1268	our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
…		…
1180	$PROTOCOL{$_} = ++$idx	1272	$PROTOCOL{$_} = ++$idx
1181	for reverse split /\s*,\s*/,	1273	for reverse split /\s*,\s*/,
1182	$ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";	1274	$ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1183	}	1275	}
1184		1276
		1277	our @post_detect;
		1278
		1279	sub post_detect(&) {
		1280	my ($cb) = @_;
		1281
		1282	push @post_detect, $cb;
		1283
		1284	defined wantarray
		1285	? bless \$cb, "AnyEvent::Util::postdetect"
		1286	: ()
		1287	}
		1288
		1289	sub AnyEvent::Util::postdetect::DESTROY {
		1290	@post_detect = grep $_ != ${$_[0]}, @post_detect;
		1291	}
		1292
		1293	our $POSTPONE_W;
		1294	our @POSTPONE;
		1295
		1296	sub _postpone_exec {
		1297	undef $POSTPONE_W;
		1298
		1299	&{ shift @POSTPONE }
		1300	while @POSTPONE;
		1301	}
		1302
		1303	sub postpone(&) {
		1304	push @POSTPONE, shift;
		1305
		1306	$POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
		1307
		1308	()
		1309	}
		1310
		1311	sub log($$;@) {
		1312	# only load the big bloated module when we actually are about to log something
		1313	if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!)
		1314	require AnyEvent::Log;
		1315	# AnyEvent::Log overwrites this function
		1316	goto &log;
		1317	}
		1318
		1319	0 # not logged
		1320	}
		1321
		1322	if (length $ENV{PERL_ANYEVENT_LOG}) {
		1323	require AnyEvent::Log; # AnyEvent::Log does the thing for us
		1324	}
		1325
1185	my @models = (	1326	our @models = (
1186	[EV:: => AnyEvent::Impl::EV:: , 1],	1327	[EV:: => AnyEvent::Impl::EV:: , 1],
1187	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1328	[AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],
1188	# everything below here will not (normally) be autoprobed	1329	# everything below here will not (normally) be autoprobed
1189	# as the pureperl backend should work everywhere	1330	# as the pure perl backend should work everywhere
1190	# and is usually faster	1331	# and is usually faster
1191	[Event:: => AnyEvent::Impl::Event::, 1],	1332	[Event:: => AnyEvent::Impl::Event::, 1],
1192	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1333	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1193	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1334	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1194	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1335	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1195	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1336	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1196	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1337	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1197	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1338	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1198	[Wx:: => AnyEvent::Impl::POE::],	1339	[Wx:: => AnyEvent::Impl::POE::],
1199	[Prima:: => AnyEvent::Impl::POE::],	1340	[Prima:: => AnyEvent::Impl::POE::],
1200	# IO::Async is just too broken - we would need workarounds for its	1341	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1201	# byzantine signal and broken child handling, among others.	1342	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1202	# IO::Async is rather hard to detect, as it doesn't have any	1343	[FLTK:: => AnyEvent::Impl::FLTK::],
1203	# obvious default class.
1204	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1205	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1206	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
1207	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1208	);	1344	);
1209		1345
1210	our %method = map +($_ => 1),	1346	our @isa_hook;
		1347
		1348	sub _isa_set {
		1349	my @pkg = ("AnyEvent", (map $_->[0], grep defined, @isa_hook), $MODEL);
		1350
		1351	@{"$pkg[$_-1]::ISA"} = $pkg[$_]
		1352	for 1 .. $#pkg;
		1353
		1354	grep $_ && $_->[1], @isa_hook
		1355	and AE::_reset ();
		1356	}
		1357
		1358	# used for hooking AnyEvent::Strict and AnyEvent::Debug::Wrap into the class hierarchy
		1359	sub _isa_hook($$;$) {
		1360	my ($i, $pkg, $reset_ae) = @_;
		1361
		1362	$isa_hook[$i] = $pkg ? [$pkg, $reset_ae] : undef;
		1363
		1364	_isa_set;
		1365	}
		1366
		1367	# all autoloaded methods reserve the complete glob, not just the method slot.
		1368	# due to bugs in perls method cache implementation.
1211	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1369	our @methods = qw(io timer time now now_update signal child idle condvar);
1212
1213	our @post_detect;
1214
1215	sub post_detect(&) {
1216	my ($cb) = @_;
1217
1218	push @post_detect, $cb;
1219
1220	defined wantarray
1221	? bless \$cb, "AnyEvent::Util::postdetect"
1222	: ()
1223	}
1224
1225	sub AnyEvent::Util::postdetect::DESTROY {
1226	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1227	}
1228		1370
1229	sub detect() {	1371	sub detect() {
		1372	return $MODEL if $MODEL; # some programs keep references to detect
		1373
		1374	local $!; # for good measure
		1375	local $SIG{__DIE__}; # we use eval
		1376
1230	# free some memory	1377	# free some memory
1231	*detect = sub () { $MODEL };	1378	*detect = sub () { $MODEL };
		1379	# undef &func doesn't correctly update the method cache. grmbl.
		1380	# so we delete the whole glob. grmbl.
		1381	# otoh, perl doesn't let me undef an active usb, but it lets me free
		1382	# a glob with an active sub. hrm. i hope it works, but perl is
		1383	# usually buggy in this department. sigh.
		1384	delete @{"AnyEvent::"}{@methods};
		1385	undef @methods;
1232		1386
1233	local $!; # for good measure
1234	local $SIG{__DIE__};
1235
1236	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1387	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1237	my $model = "AnyEvent::Impl::$1";	1388	my $model = $1;
		1389	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1238	if (eval "require $model") {	1390	if (eval "require $model") {
		1391	AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1239	$MODEL = $model;	1392	$MODEL = $model;
1240	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1241	} else {	1393	} else {
1242	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1394	AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1243	}	1395	}
1244	}	1396	}
1245		1397
1246	# check for already loaded models	1398	# check for already loaded models
1247	unless ($MODEL) {	1399	unless ($MODEL) {
1248	for (@REGISTRY, @models) {	1400	for (@REGISTRY, @models) {
1249	my ($package, $model) = @$_;	1401	my ($package, $model) = @$_;
1250	if (${"$package\::VERSION"} > 0) {	1402	if (${"$package\::VERSION"} > 0) {
1251	if (eval "require $model") {	1403	if (eval "require $model") {
		1404	AnyEvent::log 7 => "autodetected model '$model', using it.";
1252	$MODEL = $model;	1405	$MODEL = $model;
1253	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1254	last;	1406	last;
1255	}	1407	}
1256	}	1408	}
1257	}	1409	}
1258		1410
…		…
1264	$autoload	1416	$autoload
1265	and eval "require $package"	1417	and eval "require $package"
1266	and ${"$package\::VERSION"} > 0	1418	and ${"$package\::VERSION"} > 0
1267	and eval "require $model"	1419	and eval "require $model"
1268	) {	1420	) {
		1421	AnyEvent::log 7 => "autoloaded model '$model', using it.";
1269	$MODEL = $model;	1422	$MODEL = $model;
1270	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1271	last;	1423	last;
1272	}	1424	}
1273	}	1425	}
1274		1426
1275	$MODEL	1427	$MODEL
1276	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1428	or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?";
1277	}	1429	}
1278	}	1430	}
1279		1431
1280	@models = (); # free probe data	1432	# free memory only needed for probing
		1433	undef @models;
		1434	undef @REGISTRY;
1281		1435
1282	push @{"$MODEL\::ISA"}, "AnyEvent::Base";	1436	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1283	unshift @ISA, $MODEL;
1284		1437
1285	# now nuke some methods that are overriden by the backend.	1438	# now nuke some methods that are overridden by the backend.
1286	# SUPER is not allowed.	1439	# SUPER usage is not allowed in these.
1287	for (qw(time signal child idle)) {	1440	for (qw(time signal child idle)) {
1288	undef &{"AnyEvent::Base::$_"}	1441	undef &{"AnyEvent::Base::$_"}
1289	if defined &{"$MODEL\::$_"};	1442	if defined &{"$MODEL\::$_"};
1290	}	1443	}
1291		1444
1292	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};	1445	_isa_set;
		1446
		1447	# we're officially open!
		1448
		1449	if ($ENV{PERL_ANYEVENT_STRICT}) {
		1450	require AnyEvent::Strict;
		1451	}
		1452
		1453	if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
		1454	require AnyEvent::Debug;
		1455	AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
		1456	}
		1457
		1458	if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
		1459	require AnyEvent::Socket;
		1460	require AnyEvent::Debug;
		1461
		1462	my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
		1463	$shell =~ s/\$\$/$$/g;
		1464
		1465	my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
		1466	$AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
		1467	}
		1468
		1469	# now the anyevent environment is set up as the user told us to, so
		1470	# call the actual user code - post detects
1293		1471
1294	(shift @post_detect)->() while @post_detect;	1472	(shift @post_detect)->() while @post_detect;
		1473	undef @post_detect;
1295		1474
1296	*post_detect = sub(&) {	1475	*post_detect = sub(&) {
1297	shift->();	1476	shift->();
1298		1477
1299	undef	1478	undef
1300	};	1479	};
1301		1480
1302	$MODEL	1481	$MODEL
1303	}	1482	}
1304		1483
1305	sub AUTOLOAD {	1484	for my $name (@methods) {
1306	(my $func = $AUTOLOAD) =~ s/.*://;	1485	*$name = sub {
1307
1308	$method{$func}
1309	or Carp::croak "$func: not a valid AnyEvent class method";
1310
1311	detect;	1486	detect;
1312		1487	# we use goto because
1313	my $class = shift;	1488	# a) it makes the thunk more transparent
1314	$class->$func (@_);	1489	# b) it allows us to delete the thunk later
		1490	goto &{ UNIVERSAL::can AnyEvent => "SUPER::$name" }
		1491	};
1315	}	1492	}
1316		1493
1317	# utility function to dup a filehandle. this is used by many backends	1494	# utility function to dup a filehandle. this is used by many backends
1318	# to support binding more than one watcher per filehandle (they usually	1495	# to support binding more than one watcher per filehandle (they usually
1319	# allow only one watcher per fd, so we dup it to get a different one).	1496	# allow only one watcher per fd, so we dup it to get a different one).
…		…
1343		1520
1344	package AE;	1521	package AE;
1345		1522
1346	our $VERSION = $AnyEvent::VERSION;	1523	our $VERSION = $AnyEvent::VERSION;
1347		1524
		1525	sub _reset() {
		1526	eval q{
1348	# fall back to the main API by default - backends and AnyEvent::Base	1527	# fall back to the main API by default - backends and AnyEvent::Base
1349	# implementations can overwrite these.	1528	# implementations can overwrite these.
1350		1529
1351	sub io($$$) {	1530	sub io($$$) {
1352	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])	1531	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1353	}	1532	}
1354		1533
1355	sub timer($$$) {	1534	sub timer($$$) {
1356	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])	1535	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
1357	}	1536	}
1358		1537
1359	sub signal($$) {	1538	sub signal($$) {
1360	AnyEvent->signal (signal => $_[0], cb => $_[1])	1539	AnyEvent->signal (signal => $_[0], cb => $_[1])
1361	}	1540	}
1362		1541
1363	sub child($$) {	1542	sub child($$) {
1364	AnyEvent->child (pid => $_[0], cb => $_[1])	1543	AnyEvent->child (pid => $_[0], cb => $_[1])
1365	}	1544	}
1366		1545
1367	sub idle($) {	1546	sub idle($) {
1368	AnyEvent->idle (cb => $_[0])	1547	AnyEvent->idle (cb => $_[0]);
1369	}	1548	}
1370		1549
1371	sub cv(;&) {	1550	sub cv(;&) {
1372	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())	1551	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1373	}	1552	}
1374		1553
1375	sub now() {	1554	sub now() {
1376	AnyEvent->now	1555	AnyEvent->now
1377	}	1556	}
1378		1557
1379	sub now_update() {	1558	sub now_update() {
1380	AnyEvent->now_update	1559	AnyEvent->now_update
1381	}	1560	}
1382		1561
1383	sub time() {	1562	sub time() {
1384	AnyEvent->time	1563	AnyEvent->time
		1564	}
		1565
		1566	*postpone = \&AnyEvent::postpone;
		1567	*log = \&AnyEvent::log;
		1568	};
		1569	die if $@;
1385	}	1570	}
		1571
		1572	BEGIN { _reset }
1386		1573
1387	package AnyEvent::Base;	1574	package AnyEvent::Base;
1388		1575
1389	# default implementations for many methods	1576	# default implementations for many methods
1390		1577
1391	sub time {	1578	sub time {
1392	eval q{ # poor man's autoloading {}	1579	eval q{ # poor man's autoloading {}
1393	# probe for availability of Time::HiRes	1580	# probe for availability of Time::HiRes
1394	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1581	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1395	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1582	*time = sub { Time::HiRes::time () };
1396	*AE::time = \&Time::HiRes::time;	1583	*AE::time = \& Time::HiRes::time ;
		1584	*now = \&time;
		1585	AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy.";
1397	# if (eval "use POSIX (); (POSIX::times())...	1586	# if (eval "use POSIX (); (POSIX::times())...
1398	} else {	1587	} else {
		1588	*time = sub { CORE::time };
		1589	*AE::time = sub (){ CORE::time };
		1590	*now = \&time;
1399	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1591	AnyEvent::log 3 => "using built-in time(), WARNING, no sub-second resolution!";
1400	*AE::time = sub (){ time }; # epic fail
1401	}	1592	}
1402
1403	*time = sub { AE::time }; # different prototypes
1404	};	1593	};
1405	die if $@;	1594	die if $@;
1406		1595
1407	&time	1596	&time
1408	}	1597	}
1409		1598
1410	*now = \&time;	1599	*now = \&time;
1411
1412	sub now_update { }	1600	sub now_update { }
1413		1601
		1602	sub _poll {
		1603	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
		1604	}
		1605
1414	# default implementation for ->condvar	1606	# default implementation for ->condvar
		1607	# in fact, the default should not be overwritten
1415		1608
1416	sub condvar {	1609	sub condvar {
1417	eval q{ # poor man's autoloading {}	1610	eval q{ # poor man's autoloading {}
1418	*condvar = sub {	1611	*condvar = sub {
1419	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1612	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
…		…
1497		1690
1498	sub signal {	1691	sub signal {
1499	eval q{ # poor man's autoloading {}	1692	eval q{ # poor man's autoloading {}
1500	# probe for availability of Async::Interrupt	1693	# probe for availability of Async::Interrupt
1501	if (_have_async_interrupt) {	1694	if (_have_async_interrupt) {
1502	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1695	AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1503		1696
1504	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1697	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1505	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;	1698	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1506		1699
1507	} else {	1700	} else {
1508	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1701	AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1509		1702
1510	if (AnyEvent::WIN32) {	1703	if (AnyEvent::WIN32) {
1511	require AnyEvent::Util;	1704	require AnyEvent::Util;
1512		1705
1513	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1706	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
…		…
1589	: sysread $SIGPIPE_R, (my $dummy), 9;	1782	: sysread $SIGPIPE_R, (my $dummy), 9;
1590		1783
1591	while (%SIG_EV) {	1784	while (%SIG_EV) {
1592	for (keys %SIG_EV) {	1785	for (keys %SIG_EV) {
1593	delete $SIG_EV{$_};	1786	delete $SIG_EV{$_};
1594	$_->() for values %{ $SIG_CB{$_} || {} };	1787	&$_ for values %{ $SIG_CB{$_} || {} };
1595	}	1788	}
1596	}	1789	}
1597	};	1790	};
1598	};	1791	};
1599	die if $@;	1792	die if $@;
…		…
1604	# default implementation for ->child	1797	# default implementation for ->child
1605		1798
1606	our %PID_CB;	1799	our %PID_CB;
1607	our $CHLD_W;	1800	our $CHLD_W;
1608	our $CHLD_DELAY_W;	1801	our $CHLD_DELAY_W;
1609	our $WNOHANG;
1610		1802
1611	# used by many Impl's	1803	# used by many Impl's
1612	sub _emit_childstatus($$) {	1804	sub _emit_childstatus($$) {
1613	my (undef, $rpid, $rstatus) = @_;	1805	my (undef, $rpid, $rstatus) = @_;
1614		1806
…		…
1621	eval q{ # poor man's autoloading {}	1813	eval q{ # poor man's autoloading {}
1622	*_sigchld = sub {	1814	*_sigchld = sub {
1623	my $pid;	1815	my $pid;
1624		1816
1625	AnyEvent->_emit_childstatus ($pid, $?)	1817	AnyEvent->_emit_childstatus ($pid, $?)
1626	while ($pid = waitpid -1, $WNOHANG) > 0;	1818	while ($pid = waitpid -1, WNOHANG) > 0;
1627	};	1819	};
1628		1820
1629	*child = sub {	1821	*child = sub {
1630	my (undef, %arg) = @_;	1822	my (undef, %arg) = @_;
1631		1823
1632	defined (my $pid = $arg{pid} + 0)	1824	my $pid = $arg{pid};
1633	or Carp::croak "required option 'pid' is missing";	1825	my $cb = $arg{cb};
1634		1826
1635	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1827	$PID_CB{$pid}{$cb+0} = $cb;
1636
1637	# WNOHANG is almost cetrainly 1 everywhere
1638	$WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/
1639	? 1
1640	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1;
1641		1828
1642	unless ($CHLD_W) {	1829	unless ($CHLD_W) {
1643	$CHLD_W = AE::signal CHLD => \&_sigchld;	1830	$CHLD_W = AE::signal CHLD => \&_sigchld;
1644	# child could be a zombie already, so make at least one round	1831	# child could be a zombie already, so make at least one round
1645	&_sigchld;	1832	&_sigchld;
1646	}	1833	}
1647		1834
1648	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1835	bless [$pid, $cb+0], "AnyEvent::Base::child"
1649	};	1836	};
1650		1837
1651	*AnyEvent::Base::child::DESTROY = sub {	1838	*AnyEvent::Base::child::DESTROY = sub {
1652	my ($pid, $cb) = @{$_[0]};	1839	my ($pid, $icb) = @{$_[0]};
1653		1840
1654	delete $PID_CB{$pid}{$cb};	1841	delete $PID_CB{$pid}{$icb};
1655	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1842	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1656		1843
1657	undef $CHLD_W unless keys %PID_CB;	1844	undef $CHLD_W unless keys %PID_CB;
1658	};	1845	};
1659	};	1846	};
…		…
1672		1859
1673	my ($cb, $w, $rcb) = $arg{cb};	1860	my ($cb, $w, $rcb) = $arg{cb};
1674		1861
1675	$rcb = sub {	1862	$rcb = sub {
1676	if ($cb) {	1863	if ($cb) {
1677	$w = _time;	1864	$w = AE::time;
1678	&$cb;	1865	&$cb;
1679	$w = _time - $w;	1866	$w = AE::time - $w;
1680		1867
1681	# never use more then 50% of the time for the idle watcher,	1868	# never use more then 50% of the time for the idle watcher,
1682	# within some limits	1869	# within some limits
1683	$w = 0.0001 if $w < 0.0001;	1870	$w = 0.0001 if $w < 0.0001;
1684	$w = 5 if $w > 5;	1871	$w = 5 if $w > 5;
…		…
1707		1894
1708	package AnyEvent::CondVar;	1895	package AnyEvent::CondVar;
1709		1896
1710	our @ISA = AnyEvent::CondVar::Base::;	1897	our @ISA = AnyEvent::CondVar::Base::;
1711		1898
		1899	# only to be used for subclassing
		1900	sub new {
		1901	my $class = shift;
		1902	bless AnyEvent->condvar (@_), $class
		1903	}
		1904
1712	package AnyEvent::CondVar::Base;	1905	package AnyEvent::CondVar::Base;
1713		1906
1714	#use overload	1907	#use overload
1715	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },	1908	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },
1716	# fallback => 1;	1909	# fallback => 1;
…		…
1725		1918
1726	sub _send {	1919	sub _send {
1727	# nop	1920	# nop
1728	}	1921	}
1729		1922
		1923	sub _wait {
		1924	AnyEvent->_poll until $_[0]{_ae_sent};
		1925	}
		1926
1730	sub send {	1927	sub send {
1731	my $cv = shift;	1928	my $cv = shift;
1732	$cv->{_ae_sent} = [@_];	1929	$cv->{_ae_sent} = [@_];
1733	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};	1930	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};
1734	$cv->_send;	1931	$cv->_send;
…		…
1741		1938
1742	sub ready {	1939	sub ready {
1743	$_[0]{_ae_sent}	1940	$_[0]{_ae_sent}
1744	}	1941	}
1745		1942
1746	sub _wait {
1747	$WAITING
1748	and !$_[0]{_ae_sent}
1749	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
1750
1751	local $WAITING = 1;
1752	AnyEvent->one_event while !$_[0]{_ae_sent};
1753	}
1754
1755	sub recv {	1943	sub recv {
		1944	unless ($_[0]{_ae_sent}) {
		1945	$WAITING
		1946	and Carp::croak "AnyEvent::CondVar: recursive blocking wait attempted";
		1947
		1948	local $WAITING = 1;
1756	$_[0]->_wait;	1949	$_[0]->_wait;
		1950	}
1757		1951
1758	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1952	$_[0]{_ae_croak}
1759	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1953	and Carp::croak $_[0]{_ae_croak};
		1954
		1955	wantarray
		1956	? @{ $_[0]{_ae_sent} }
		1957	: $_[0]{_ae_sent}[0]
1760	}	1958	}
1761		1959
1762	sub cb {	1960	sub cb {
1763	my $cv = shift;	1961	my $cv = shift;
1764		1962
…		…
1780	&{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };	1978	&{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };
1781	}	1979	}
1782		1980
1783	# undocumented/compatibility with pre-3.4	1981	# undocumented/compatibility with pre-3.4
1784	*broadcast = \&send;	1982	*broadcast = \&send;
1785	*wait = \&_wait;	1983	*wait = \&recv;
1786		1984
1787	=head1 ERROR AND EXCEPTION HANDLING	1985	=head1 ERROR AND EXCEPTION HANDLING
1788		1986
1789	In general, AnyEvent does not do any error handling - it relies on the	1987	In general, AnyEvent does not do any error handling - it relies on the
1790	caller to do that if required. The L<AnyEvent::Strict> module (see also	1988	caller to do that if required. The L<AnyEvent::Strict> module (see also
…		…
1802	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and	2000	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1803	so on.	2001	so on.
1804		2002
1805	=head1 ENVIRONMENT VARIABLES	2003	=head1 ENVIRONMENT VARIABLES
1806		2004
1807	The following environment variables are used by this module or its	2005	AnyEvent supports a number of environment variables that tune the
1808	submodules.	2006	runtime behaviour. They are usually evaluated when AnyEvent is
		2007	loaded, initialised, or a submodule that uses them is loaded. Many of
		2008	them also cause AnyEvent to load additional modules - for example,
		2009	C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
		2010	loaded.
1809		2011
1810	Note that AnyEvent will remove I<all> environment variables starting with	2012	All the environment variables documented here start with
1811	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is	2013	C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1812	enabled.	2014	namespace. Other modules are encouraged (but by no means required) to use
		2015	C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
		2016	namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
		2017	be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
		2018	variables starting with C<AE_>, see below).
		2019
		2020	All variables can also be set via the C<AE_> prefix, that is, instead
		2021	of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
		2022	case there is a clash btween anyevent and another program that uses
		2023	C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
		2024	variable to the empty string, as those variables take precedence.
		2025
		2026	When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
		2027	to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
		2028	exists. If taint mode is on, then AnyEvent will remove I<all> environment
		2029	variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
		2030	with C<undef> or the empty string, if the corresaponding C<AE_> variable
		2031	is set).
		2032
		2033	The exact algorithm is currently:
		2034
		2035	1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
		2036	2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
		2037	3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
		2038
		2039	This ensures that child processes will not see the C<AE_> variables.
		2040
		2041	The following environment variables are currently known to AnyEvent:
1813		2042
1814	=over 4	2043	=over 4
1815		2044
1816	=item C<PERL_ANYEVENT_VERBOSE>	2045	=item C<PERL_ANYEVENT_VERBOSE>
1817		2046
1818	By default, AnyEvent will be completely silent except in fatal	2047	By default, AnyEvent will only log messages with loglevel C<3>
1819	conditions. You can set this environment variable to make AnyEvent more	2048	(C<critical>) or higher (see L<AnyEvent::Log>). You can set this
		2049	environment variable to a numerical loglevel to make AnyEvent more (or
1820	talkative.	2050	less) talkative.
1821		2051
		2052	If you want to do more than just set the global logging level
		2053	you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
		2054	complex specifications.
		2055
		2056	When set to C<0> (C<off>), then no messages whatsoever will be logged with
		2057	the default logging settings.
		2058
1822	When set to C<1> or higher, causes AnyEvent to warn about unexpected	2059	When set to C<5> or higher (C<warn>), causes AnyEvent to warn about
1823	conditions, such as not being able to load the event model specified by	2060	unexpected conditions, such as not being able to load the event model
1824	C<PERL_ANYEVENT_MODEL>.	2061	specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
		2062	exception - this is the minimum recommended level.
1825		2063
1826	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	2064	When set to C<7> or higher (info), cause AnyEvent to report which event model it
1827	model it chooses.	2065	chooses.
1828		2066
1829	When set to C<8> or higher, then AnyEvent will report extra information on	2067	When set to C<8> or higher (debug), then AnyEvent will report extra information on
1830	which optional modules it loads and how it implements certain features.	2068	which optional modules it loads and how it implements certain features.
		2069
		2070	=item C<PERL_ANYEVENT_LOG>
		2071
		2072	Accepts rather complex logging specifications. For example, you could log
		2073	all C<debug> messages of some module to stderr, warnings and above to
		2074	stderr, and errors and above to syslog, with:
		2075
		2076	PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
		2077
		2078	For the rather extensive details, see L<AnyEvent::Log>.
		2079
		2080	This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
		2081	so will take effect even before AnyEvent has initialised itself.
		2082
		2083	Note that specifying this environment variable causes the L<AnyEvent::Log>
		2084	module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
		2085	using the latter saves a few hundred kB of memory until the first message
		2086	is being logged.
1831		2087
1832	=item C<PERL_ANYEVENT_STRICT>	2088	=item C<PERL_ANYEVENT_STRICT>
1833		2089
1834	AnyEvent does not do much argument checking by default, as thorough	2090	AnyEvent does not do much argument checking by default, as thorough
1835	argument checking is very costly. Setting this variable to a true value	2091	argument checking is very costly. Setting this variable to a true value
…		…
1837	check the arguments passed to most method calls. If it finds any problems,	2093	check the arguments passed to most method calls. If it finds any problems,
1838	it will croak.	2094	it will croak.
1839		2095
1840	In other words, enables "strict" mode.	2096	In other words, enables "strict" mode.
1841		2097
1842	Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense>	2098	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>
1843	>>, it is definitely recommended to keep it off in production. Keeping	2099	>>, it is definitely recommended to keep it off in production. Keeping
1844	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs	2100	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1845	can be very useful, however.	2101	can be very useful, however.
1846		2102
		2103	=item C<PERL_ANYEVENT_DEBUG_SHELL>
		2104
		2105	If this env variable is set, then its contents will be interpreted by
		2106	C<AnyEvent::Socket::parse_hostport> (after replacing every occurance of
		2107	C<$$> by the process pid) and an C<AnyEvent::Debug::shell> is bound on
		2108	that port. The shell object is saved in C<$AnyEvent::Debug::SHELL>.
		2109
		2110	This happens when the first watcher is created.
		2111
		2112	For example, to bind a debug shell on a unix domain socket in
		2113	F<< /tmp/debug<pid>.sock >>, you could use this:
		2114
		2115	PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
		2116
		2117	Note that creating sockets in F</tmp> is very unsafe on multiuser
		2118	systems.
		2119
		2120	=item C<PERL_ANYEVENT_DEBUG_WRAP>
		2121
		2122	Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
		2123	debugging purposes. See C<AnyEvent::Debug::wrap> for details.
		2124
1847	=item C<PERL_ANYEVENT_MODEL>	2125	=item C<PERL_ANYEVENT_MODEL>
1848		2126
1849	This can be used to specify the event model to be used by AnyEvent, before	2127	This can be used to specify the event model to be used by AnyEvent, before
1850	auto detection and -probing kicks in. It must be a string consisting	2128	auto detection and -probing kicks in.
1851	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended	2129
		2130	It normally is a string consisting entirely of ASCII letters (e.g. C<EV>
		2131	or C<IOAsync>). The string C<AnyEvent::Impl::> gets prepended and the
1852	and the resulting module name is loaded and if the load was successful,	2132	resulting module name is loaded and - if the load was successful - used as
1853	used as event model. If it fails to load AnyEvent will proceed with	2133	event model backend. If it fails to load then AnyEvent will proceed with
1854	auto detection and -probing.	2134	auto detection and -probing.
1855		2135
1856	This functionality might change in future versions.	2136	If the string ends with C<::> instead (e.g. C<AnyEvent::Impl::EV::>) then
		2137	nothing gets prepended and the module name is used as-is (hint: C<::> at
		2138	the end of a string designates a module name and quotes it appropriately).
1857		2139
1858	For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you	2140	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1859	could start your program like this:	2141	could start your program like this:
1860		2142
1861	PERL_ANYEVENT_MODEL=Perl perl ...	2143	PERL_ANYEVENT_MODEL=Perl perl ...
1862		2144
1863	=item C<PERL_ANYEVENT_PROTOCOLS>	2145	=item C<PERL_ANYEVENT_PROTOCOLS>
…		…
1879	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	2161	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1880	- only support IPv4, never try to resolve or contact IPv6	2162	- only support IPv4, never try to resolve or contact IPv6
1881	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	2163	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1882	IPv6, but prefer IPv6 over IPv4.	2164	IPv6, but prefer IPv6 over IPv4.
1883		2165
		2166	=item C<PERL_ANYEVENT_HOSTS>
		2167
		2168	This variable, if specified, overrides the F</etc/hosts> file used by
		2169	L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
		2170	from that file instead.
		2171
1884	=item C<PERL_ANYEVENT_EDNS0>	2172	=item C<PERL_ANYEVENT_EDNS0>
1885		2173
1886	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension	2174	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
1887	for DNS. This extension is generally useful to reduce DNS traffic, but	2175	DNS. This extension is generally useful to reduce DNS traffic, especially
1888	some (broken) firewalls drop such DNS packets, which is why it is off by	2176	when DNSSEC is involved, but some (broken) firewalls drop such DNS
1889	default.	2177	packets, which is why it is off by default.
1890		2178
1891	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce	2179	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
1892	EDNS0 in its DNS requests.	2180	EDNS0 in its DNS requests.
1893		2181
1894	=item C<PERL_ANYEVENT_MAX_FORKS>	2182	=item C<PERL_ANYEVENT_MAX_FORKS>
…		…
1902	resolver - this is the maximum number of parallel DNS requests that are	2190	resolver - this is the maximum number of parallel DNS requests that are
1903	sent to the DNS server.	2191	sent to the DNS server.
1904		2192
1905	=item C<PERL_ANYEVENT_RESOLV_CONF>	2193	=item C<PERL_ANYEVENT_RESOLV_CONF>
1906		2194
1907	The file to use instead of F</etc/resolv.conf> (or OS-specific	2195	The absolute path to a F<resolv.conf>-style file to use instead of
1908	configuration) in the default resolver. When set to the empty string, no	2196	F</etc/resolv.conf> (or the OS-specific configuration) in the default
1909	default config will be used.	2197	resolver, or the empty string to select the default configuration.
1910		2198
1911	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.	2199	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
1912		2200
1913	When neither C<ca_file> nor C<ca_path> was specified during	2201	When neither C<ca_file> nor C<ca_path> was specified during
1914	L<AnyEvent::TLS> context creation, and either of these environment	2202	L<AnyEvent::TLS> context creation, and either of these environment
1915	variables exist, they will be used to specify CA certificate locations	2203	variables are nonempty, they will be used to specify CA certificate
1916	instead of a system-dependent default.	2204	locations instead of a system-dependent default.
1917		2205
1918	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>	2206	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
1919		2207
1920	When these are set to C<1>, then the respective modules are not	2208	When these are set to C<1>, then the respective modules are not
1921	loaded. Mostly good for testing AnyEvent itself.	2209	loaded. Mostly good for testing AnyEvent itself.
…		…
2253	(even when used without AnyEvent), but most event loops have acceptable	2541	(even when used without AnyEvent), but most event loops have acceptable
2254	performance with or without AnyEvent.	2542	performance with or without AnyEvent.
2255		2543
2256	=item * The overhead AnyEvent adds is usually much smaller than the overhead of	2544	=item * The overhead AnyEvent adds is usually much smaller than the overhead of
2257	the actual event loop, only with extremely fast event loops such as EV	2545	the actual event loop, only with extremely fast event loops such as EV
2258	adds AnyEvent significant overhead.	2546	does AnyEvent add significant overhead.
2259		2547
2260	=item * You should avoid POE like the plague if you want performance or	2548	=item * You should avoid POE like the plague if you want performance or
2261	reasonable memory usage.	2549	reasonable memory usage.
2262		2550
2263	=back	2551	=back
…		…
2493	unless defined $SIG{PIPE};	2781	unless defined $SIG{PIPE};
2494		2782
2495	=head1 RECOMMENDED/OPTIONAL MODULES	2783	=head1 RECOMMENDED/OPTIONAL MODULES
2496		2784
2497	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and	2785	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and
2498	it's built-in modules) are required to use it.	2786	its built-in modules) are required to use it.
2499		2787
2500	That does not mean that AnyEvent won't take advantage of some additional	2788	That does not mean that AnyEvent won't take advantage of some additional
2501	modules if they are installed.	2789	modules if they are installed.
2502		2790
2503	This section explains which additional modules will be used, and how they	2791	This section explains which additional modules will be used, and how they
…		…
2561	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.	2849	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.
2562		2850
2563	=item L<Time::HiRes>	2851	=item L<Time::HiRes>
2564		2852
2565	This module is part of perl since release 5.008. It will be used when the	2853	This module is part of perl since release 5.008. It will be used when the
2566	chosen event library does not come with a timing source on it's own. The	2854	chosen event library does not come with a timing source of its own. The
2567	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to	2855	pure-perl event loop (L<AnyEvent::Loop>) will additionally load it to
2568	try to use a monotonic clock for timing stability.	2856	try to use a monotonic clock for timing stability.
2569		2857
2570	=back	2858	=back
2571		2859
2572		2860
…		…
2634	pronounced).	2922	pronounced).
2635		2923
2636		2924
2637	=head1 SEE ALSO	2925	=head1 SEE ALSO
2638		2926
2639	Utility functions: L<AnyEvent::Util>.	2927	Tutorial/Introduction: L<AnyEvent::Intro>.
2640		2928
2641	Event modules: L<EV>, L<EV::Glib>, L<Glib::EV>, L<Event>, L<Glib::Event>,	2929	FAQ: L<AnyEvent::FAQ>.
2642	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2930
		2931	Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
		2932	(simply logging).
		2933
		2934	Development/Debugging: L<AnyEvent::Strict> (stricter checking),
		2935	L<AnyEvent::Debug> (interactive shell, watcher tracing).
		2936
		2937	Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
		2938	L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
		2939	L<Qt>, L<POE>, L<FLTK>.
2643		2940
2644	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2941	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2645	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2942	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2646	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2943	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2647	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.	2944	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
		2945	L<AnyEvent::Impl::FLTK>.
2648		2946
2649	Non-blocking file handles, sockets, TCP clients and	2947	Non-blocking handles, pipes, stream sockets, TCP clients and
2650	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	2948	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2651		2949
2652	Asynchronous DNS: L<AnyEvent::DNS>.	2950	Asynchronous DNS: L<AnyEvent::DNS>.
2653		2951
2654	Coroutine support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>,	2952	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.
2655	L<Coro::Event>,
2656		2953
2657	Nontrivial usage examples: L<AnyEvent::GPSD>, L<AnyEvent::XMPP>,	2954	Nontrivial usage examples: L<AnyEvent::GPSD>, L<AnyEvent::IRC>,
2658	L<AnyEvent::HTTP>.	2955	L<AnyEvent::HTTP>.
2659		2956
2660		2957
2661	=head1 AUTHOR	2958	=head1 AUTHOR
2662		2959

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