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Revision 1.253 by root, Tue Jul 21 06:00:47 2009 UTC vs.
Revision 1.410 by root, Fri Mar 1 06:03:21 2013 UTC

1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - events independent of event loop implementation	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt,
6	event loops.	6	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
		12	# if you prefer function calls, look at the AE manpage for
		13	# an alternative API.
		14
12	# file descriptor readable	15	# file handle or descriptor readable
13	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });	16	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });
14		17
15	# one-shot or repeating timers	18	# one-shot or repeating timers
16	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });	19	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });
17	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...	20	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...);
18		21
19	print AnyEvent->now; # prints current event loop time	22	print AnyEvent->now; # prints current event loop time
20	print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.	23	print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.
21		24
22	# POSIX signal	25	# POSIX signal
…		…
43	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
44	L<AnyEvent::Intro> manpage.	47	L<AnyEvent::Intro> manpage.
45		48
46	=head1 SUPPORT	49	=head1 SUPPORT
47		50
		51	An FAQ document is available as L<AnyEvent::FAQ>.
		52
48	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
49	channel, too.	54	channel, too.
50		55
51	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
52	Respository>, at L<http://anyevent.schmorp.de>, for more info.	57	Repository>, at L<http://anyevent.schmorp.de>, for more info.
53		58
54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)	59	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
55		60
56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen	61	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
57	nowadays. So what is different about AnyEvent?	62	nowadays. So what is different about AnyEvent?
…		…
73	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
74	model you use.	79	model you use.
75		80
76	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
77	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
78	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
79	cannot use anything else, as they are simply incompatible to everything	84	cannot use anything else, as they are simply incompatible to everything
80	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
81	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.
82		87
83	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works	88	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works
84	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
85	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
86	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
87	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
88	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
89	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,
90	to AnyEvent, too, so it is future-proof).	95	so it is future-proof).
91		96
92	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
93	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
94	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
95	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
96	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
97	technically possible.	102	technically possible.
98		103
99	Of course, AnyEvent comes with a big (and fully optional!) toolbox	104	Of course, AnyEvent comes with a big (and fully optional!) toolbox
100	of useful functionality, such as an asynchronous DNS resolver, 100%	105	of useful functionality, such as an asynchronous DNS resolver, 100%
…		…
106	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
107	model, you should I<not> use this module.	112	model, you should I<not> use this module.
108		113
109	=head1 DESCRIPTION	114	=head1 DESCRIPTION
110		115
111	L<AnyEvent> provides an identical interface to multiple event loops. This	116	L<AnyEvent> provides a uniform interface to various event loops. This
112	allows module authors to utilise an event loop without forcing module	117	allows module authors to use event loop functionality without forcing
113	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
114	peacefully at any one time).	119	than one event loop cannot coexist peacefully).
115		120
116	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>
117	module.	122	module.
118		123
119	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
120	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
121	following modules is already loaded: L<EV>,	126	following modules is already loaded: L<EV>, L<AnyEvent::Loop>,
122	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
123	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
124	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
125	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
126	be successfully loaded will be used. If, after this, still none could be	131	the other two are not normally tried.
127	found, AnyEvent will fall back to a pure-perl event loop, which is not
128	very efficient, but should work everywhere.
129		132
130	Because AnyEvent first checks for modules that are already loaded, loading	133	Because AnyEvent first checks for modules that are already loaded, loading
131	an event model explicitly before first using AnyEvent will likely make	134	an event model explicitly before first using AnyEvent will likely make
132	that model the default. For example:	135	that model the default. For example:
133		136
…		…
135	use AnyEvent;	138	use AnyEvent;
136		139
137	# .. AnyEvent will likely default to Tk	140	# .. AnyEvent will likely default to Tk
138		141
139	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
140	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,
141	use AnyEvent so their modules work together with others seamlessly...	144	as very few modules hardcode event loops without announcing this very
		145	loudly.
142		146
143	The pure-perl implementation of AnyEvent is called	147	The pure-perl implementation of AnyEvent is called C<AnyEvent::Loop>. Like
144	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
145	explicitly and enjoy the high availability of that event loop :)	149	availability of that event loop :)
146		150
147	=head1 WATCHERS	151	=head1 WATCHERS
148		152
149	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
150	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
…		…
155	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
156	is in control).	160	is in control).
157		161
158	Note that B<callbacks must not permanently change global variables>	162	Note that B<callbacks must not permanently change global variables>
159	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<<
160	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
161	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
162	widely between event loops.	166	widely between event loops.
163		167
164	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
165	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
166	to it).	170	to it).
167		171
168	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.
169		173
170	Many watchers either are used with "recursion" (repeating timers for	174	Many watchers either are used with "recursion" (repeating timers for
171	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.
172		176
173	An any way to achieve that is this pattern:	177	One way to achieve that is this pattern:
174		178
175	my $w; $w = AnyEvent->type (arg => value ..., cb => sub {	179	my $w; $w = AnyEvent->type (arg => value ..., cb => sub {
176	# you can use $w here, for example to undef it	180	# you can use $w here, for example to undef it
177	undef $w;	181	undef $w;
178	});	182	});
…		…
180	Note that C<my $w; $w => combination. This is necessary because in Perl,	184	Note that C<my $w; $w => combination. This is necessary because in Perl,
181	my variables are only visible after the statement in which they are	185	my variables are only visible after the statement in which they are
182	declared.	186	declared.
183		187
184	=head2 I/O WATCHERS	188	=head2 I/O WATCHERS
		189
		190	$w = AnyEvent->io (
		191	fh => <filehandle_or_fileno>,
		192	poll => <"r" or "w">,
		193	cb => <callback>,
		194	);
185		195
186	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	196	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
187	with the following mandatory key-value pairs as arguments:	197	with the following mandatory key-value pairs as arguments:
188		198
189	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch	199	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
…		…
204		214
205	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.
206	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
207	underlying file descriptor.	217	underlying file descriptor.
208		218
209	Some event loops issue spurious readyness notifications, so you should	219	Some event loops issue spurious readiness notifications, so you should
210	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
211	handles.	221	handles.
212		222
213	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
214	watcher.	224	watcher.
…		…
219	undef $w;	229	undef $w;
220	});	230	});
221		231
222	=head2 TIME WATCHERS	232	=head2 TIME WATCHERS
223		233
		234	$w = AnyEvent->timer (after => <seconds>, cb => <callback>);
		235
		236	$w = AnyEvent->timer (
		237	after => <fractional_seconds>,
		238	interval => <fractional_seconds>,
		239	cb => <callback>,
		240	);
		241
224	You can create a time watcher by calling the C<< AnyEvent->timer >>	242	You can create a time watcher by calling the C<< AnyEvent->timer >>
225	method with the following mandatory arguments:	243	method with the following mandatory arguments:
226		244
227	C<after> specifies after how many seconds (fractional values are	245	C<after> specifies after how many seconds (fractional values are
228	supported) the callback should be invoked. C<cb> is the callback to invoke	246	supported) the callback should be invoked. C<cb> is the callback to invoke
…		…
230		248
231	Although the callback might get passed parameters, their value and	249	Although the callback might get passed parameters, their value and
232	presence is undefined and you cannot rely on them. Portable AnyEvent	250	presence is undefined and you cannot rely on them. Portable AnyEvent
233	callbacks cannot use arguments passed to time watcher callbacks.	251	callbacks cannot use arguments passed to time watcher callbacks.
234		252
235	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
236	parameter, C<interval>, as a strictly positive number (> 0), then the	254	parameter, C<interval>, as a strictly positive number (> 0), then the
237	callback will be invoked regularly at that interval (in fractional	255	callback will be invoked regularly at that interval (in fractional
238	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
239	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.
240		258
241	The callback will be rescheduled before invoking the callback, but no	259	The callback will be rescheduled before invoking the callback, but no
242	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
243	only approximate.	261	only approximate.
244		262
245	Example: fire an event after 7.7 seconds.	263	Example: fire an event after 7.7 seconds.
246		264
247	my $w = AnyEvent->timer (after => 7.7, cb => sub {	265	my $w = AnyEvent->timer (after => 7.7, cb => sub {
…		…
265		283
266	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
267	use absolute time internally. This makes a difference when your clock	285	use absolute time internally. This makes a difference when your clock
268	"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
269	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
270	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.
271		289
272	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
273	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
274	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)
275	timers.	293	timers.
276		294
277	AnyEvent always prefers relative timers, if available, matching the	295	AnyEvent always prefers relative timers, if available, matching the
278	AnyEvent API.	296	AnyEvent API.
…		…
300	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
301	function to call when you want to know the current time.>	319	function to call when you want to know the current time.>
302		320
303	This function is also often faster then C<< AnyEvent->time >>, and	321	This function is also often faster then C<< AnyEvent->time >>, and
304	thus the preferred method if you want some timestamp (for example,	322	thus the preferred method if you want some timestamp (for example,
305	L<AnyEvent::Handle> uses this to update it's activity timeouts).	323	L<AnyEvent::Handle> uses this to update its activity timeouts).
306		324
307	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
308	with your timing, you can skip it without bad conscience.	326	with your timing; you can skip it without a bad conscience.
309		327
310	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>
311	and L<EV> and the following set-up:	329	and L<EV> and the following set-up:
312		330
313	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
314	time=500 (assume no other callbacks delay processing). In your callback,	332	time=500 (assume no other callbacks delay processing). In your callback,
315	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
316	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
317	after three seconds.	335	after three seconds.
318		336
…		…
338	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into	356	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into
339	account.	357	account.
340		358
341	=item AnyEvent->now_update	359	=item AnyEvent->now_update
342		360
343	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
344	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 >>,
345	AnyEvent->now >>, above).	363	above).
346		364
347	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
348	this "current" time will differ substantially from the real time, which	366	this "current" time will differ substantially from the real time, which
349	might affect timers and time-outs.	367	might affect timers and time-outs.
350		368
351	When this is the case, you can call this method, which will update the	369	When this is the case, you can call this method, which will update the
352	event loop's idea of "current time".	370	event loop's idea of "current time".
353		371
		372	A typical example would be a script in a web server (e.g. C<mod_perl>) -
		373	when mod_perl executes the script, then the event loop will have the wrong
		374	idea about the "current time" (being potentially far in the past, when the
		375	script ran the last time). In that case you should arrange a call to C<<
		376	AnyEvent->now_update >> each time the web server process wakes up again
		377	(e.g. at the start of your script, or in a handler).
		378
354	Note that updating the time I<might> cause some events to be handled.	379	Note that updating the time I<might> cause some events to be handled.
355		380
356	=back	381	=back
357		382
358	=head2 SIGNAL WATCHERS	383	=head2 SIGNAL WATCHERS
		384
		385	$w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>);
359		386
360	You can watch for signals using a signal watcher, C<signal> is the signal	387	You can watch for signals using a signal watcher, C<signal> is the signal
361	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl	388	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl
362	callback to be invoked whenever a signal occurs.	389	callback to be invoked whenever a signal occurs.
363		390
…		…
380		407
381	Example: exit on SIGINT	408	Example: exit on SIGINT
382		409
383	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	410	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
384		411
		412	=head3 Restart Behaviour
		413
		414	While restart behaviour is up to the event loop implementation, most will
		415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		416	pure perl implementation).
		417
		418	=head3 Safe/Unsafe Signals
		419
		420	Perl signals can be either "safe" (synchronous to opcode handling)
		421	or "unsafe" (asynchronous) - the former might delay signal delivery
		422	indefinitely, the latter might corrupt your memory.
		423
		424	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		425	i.e. they will not interrupt your running perl program but will only be
		426	called as part of the normal event handling (just like timer, I/O etc.
		427	callbacks, too).
		428
385	=head3 Signal Races, Delays and Workarounds	429	=head3 Signal Races, Delays and Workarounds
386		430
387	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support
388	callbacks to signals in a generic way, which is a pity, as you cannot do	432	attaching callbacks to signals in a generic way, which is a pity,
389	race-free signal handling in perl. AnyEvent will try to do it's best, but	433	as you cannot do race-free signal handling in perl, requiring
		434	C libraries for this. AnyEvent will try to do its best, which
390	in some cases, signals will be delayed. The maximum time a signal might	435	means in some cases, signals will be delayed. The maximum time
391	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10	436	a signal might be delayed is 10 seconds by default, but can
392	seconds). This variable can be changed only before the first signal	437	be overriden via C<$ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY}> or
393	watcher is created, and should be left alone otherwise. Higher values	438	C<$AnyEvent::MAX_SIGNAL_LATENCY> - see the L<ENVIRONMENT VARIABLES>
394	will cause fewer spurious wake-ups, which is better for power and CPU	439	section for details.
		440
395	saving. All these problems can be avoided by installing the optional	441	All these problems can be avoided by installing the optional
396	L<Async::Interrupt> module. This will not work with inherently broken	442	L<Async::Interrupt> module, which works with most event loops. It will not
397	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>	443	work with inherently broken event loops such as L<Event> or L<Event::Lib>
398	currently, as POE does it's own workaround with one-second latency). With	444	(and not with L<POE> currently). For those, you just have to suffer the
399	those, you just have to suffer the delays.	445	delays.
400		446
401	=head2 CHILD PROCESS WATCHERS	447	=head2 CHILD PROCESS WATCHERS
402		448
		449	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
		450
403	You can also watch on a child process exit and catch its exit status.	451	You can also watch for a child process exit and catch its exit status.
404		452
405	The child process is specified by the C<pid> argument (if set to C<0>, it	453	The child process is specified by the C<pid> argument (on some backends,
406	watches for any child process exit). The watcher will triggered only when	454	using C<0> watches for any child process exit, on others this will
407	the child process has finished and an exit status is available, not on	455	croak). The watcher will be triggered only when the child process has
408	any trace events (stopped/continued).	456	finished and an exit status is available, not on any trace events
		457	(stopped/continued).
409		458
410	The callback will be called with the pid and exit status (as returned by	459	The callback will be called with the pid and exit status (as returned by
411	waitpid), so unlike other watcher types, you I<can> rely on child watcher	460	waitpid), so unlike other watcher types, you I<can> rely on child watcher
412	callback arguments.	461	callback arguments.
413		462
…		…
431	thing in an AnyEvent program, you I<have> to create at least one	480	thing in an AnyEvent program, you I<have> to create at least one
432	watcher before you C<fork> the child (alternatively, you can call	481	watcher before you C<fork> the child (alternatively, you can call
433	C<AnyEvent::detect>).	482	C<AnyEvent::detect>).
434		483
435	As most event loops do not support waiting for child events, they will be	484	As most event loops do not support waiting for child events, they will be
436	emulated by AnyEvent in most cases, in which the latency and race problems	485	emulated by AnyEvent in most cases, in which case the latency and race
437	mentioned in the description of signal watchers apply.	486	problems mentioned in the description of signal watchers apply.
438		487
439	Example: fork a process and wait for it	488	Example: fork a process and wait for it
440		489
441	my $done = AnyEvent->condvar;	490	my $done = AnyEvent->condvar;
442		491
…		…
454	# do something else, then wait for process exit	503	# do something else, then wait for process exit
455	$done->recv;	504	$done->recv;
456		505
457	=head2 IDLE WATCHERS	506	=head2 IDLE WATCHERS
458		507
459	Sometimes there is a need to do something, but it is not so important	508	$w = AnyEvent->idle (cb => <callback>);
460	to do it instantly, but only when there is nothing better to do. This
461	"nothing better to do" is usually defined to be "no other events need
462	attention by the event loop".
463		509
464	Idle watchers ideally get invoked when the event loop has nothing	510	This will repeatedly invoke the callback after the process becomes idle,
465	better to do, just before it would block the process to wait for new	511	until either the watcher is destroyed or new events have been detected.
466	events. Instead of blocking, the idle watcher is invoked.
467		512
468	Most event loops unfortunately do not really support idle watchers (only	513	Idle watchers are useful when there is a need to do something, but it
		514	is not so important (or wise) to do it instantly. The callback will be
		515	invoked only when there is "nothing better to do", which is usually
		516	defined as "all outstanding events have been handled and no new events
		517	have been detected". That means that idle watchers ideally get invoked
		518	when the event loop has just polled for new events but none have been
		519	detected. Instead of blocking to wait for more events, the idle watchers
		520	will be invoked.
		521
		522	Unfortunately, most event loops do not really support idle watchers (only
469	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	523	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
470	will simply call the callback "from time to time".	524	will simply call the callback "from time to time".
471		525
472	Example: read lines from STDIN, but only process them when the	526	Example: read lines from STDIN, but only process them when the
473	program is otherwise idle:	527	program is otherwise idle:
…		…
489	});	543	});
490	});	544	});
491		545
492	=head2 CONDITION VARIABLES	546	=head2 CONDITION VARIABLES
493		547
		548	$cv = AnyEvent->condvar;
		549
		550	$cv->send (<list>);
		551	my @res = $cv->recv;
		552
494	If you are familiar with some event loops you will know that all of them	553	If you are familiar with some event loops you will know that all of them
495	require you to run some blocking "loop", "run" or similar function that	554	require you to run some blocking "loop", "run" or similar function that
496	will actively watch for new events and call your callbacks.	555	will actively watch for new events and call your callbacks.
497		556
498	AnyEvent is slightly different: it expects somebody else to run the event	557	AnyEvent is slightly different: it expects somebody else to run the event
499	loop and will only block when necessary (usually when told by the user).	558	loop and will only block when necessary (usually when told by the user).
500		559
501	The instrument to do that is called a "condition variable", so called	560	The tool to do that is called a "condition variable", so called because
502	because they represent a condition that must become true.	561	they represent a condition that must become true.
503		562
504	Now is probably a good time to look at the examples further below.	563	Now is probably a good time to look at the examples further below.
505		564
506	Condition variables can be created by calling the C<< AnyEvent->condvar	565	Condition variables can be created by calling the C<< AnyEvent->condvar
507	>> method, usually without arguments. The only argument pair allowed is	566	>> method, usually without arguments. The only argument pair allowed is
…		…
512	After creation, the condition variable is "false" until it becomes "true"	571	After creation, the condition variable is "false" until it becomes "true"
513	by calling the C<send> method (or calling the condition variable as if it	572	by calling the C<send> method (or calling the condition variable as if it
514	were a callback, read about the caveats in the description for the C<<	573	were a callback, read about the caveats in the description for the C<<
515	->send >> method).	574	->send >> method).
516		575
517	Condition variables are similar to callbacks, except that you can	576	Since condition variables are the most complex part of the AnyEvent API, here are
518	optionally wait for them. They can also be called merge points - points	577	some different mental models of what they are - pick the ones you can connect to:
519	in time where multiple outstanding events have been processed. And yet	578
520	another way to call them is transactions - each condition variable can be	579	=over 4
521	used to represent a transaction, which finishes at some point and delivers	580
522	a result. And yet some people know them as "futures" - a promise to	581	=item * Condition variables are like callbacks - you can call them (and pass them instead
523	compute/deliver something that you can wait for.	582	of callbacks). Unlike callbacks however, you can also wait for them to be called.
		583
		584	=item * Condition variables are signals - one side can emit or send them,
		585	the other side can wait for them, or install a handler that is called when
		586	the signal fires.
		587
		588	=item * Condition variables are like "Merge Points" - points in your program
		589	where you merge multiple independent results/control flows into one.
		590
		591	=item * Condition variables represent a transaction - functions that start
		592	some kind of transaction can return them, leaving the caller the choice
		593	between waiting in a blocking fashion, or setting a callback.
		594
		595	=item * Condition variables represent future values, or promises to deliver
		596	some result, long before the result is available.
		597
		598	=back
524		599
525	Condition variables are very useful to signal that something has finished,	600	Condition variables are very useful to signal that something has finished,
526	for example, if you write a module that does asynchronous http requests,	601	for example, if you write a module that does asynchronous http requests,
527	then a condition variable would be the ideal candidate to signal the	602	then a condition variable would be the ideal candidate to signal the
528	availability of results. The user can either act when the callback is	603	availability of results. The user can either act when the callback is
…		…
541		616
542	Condition variables are represented by hash refs in perl, and the keys	617	Condition variables are represented by hash refs in perl, and the keys
543	used by AnyEvent itself are all named C<_ae_XXX> to make subclassing	618	used by AnyEvent itself are all named C<_ae_XXX> to make subclassing
544	easy (it is often useful to build your own transaction class on top of	619	easy (it is often useful to build your own transaction class on top of
545	AnyEvent). To subclass, use C<AnyEvent::CondVar> as base class and call	620	AnyEvent). To subclass, use C<AnyEvent::CondVar> as base class and call
546	it's C<new> method in your own C<new> method.	621	its C<new> method in your own C<new> method.
547		622
548	There are two "sides" to a condition variable - the "producer side" which	623	There are two "sides" to a condition variable - the "producer side" which
549	eventually calls C<< -> send >>, and the "consumer side", which waits	624	eventually calls C<< -> send >>, and the "consumer side", which waits
550	for the send to occur.	625	for the send to occur.
551		626
552	Example: wait for a timer.	627	Example: wait for a timer.
553		628
554	# wait till the result is ready	629	# condition: "wait till the timer is fired"
555	my $result_ready = AnyEvent->condvar;	630	my $timer_fired = AnyEvent->condvar;
556		631
557	# do something such as adding a timer	632	# create the timer - we could wait for, say
558	# or socket watcher the calls $result_ready->send	633	# a handle becomign ready, or even an
559	# when the "result" is ready.	634	# AnyEvent::HTTP request to finish, but
560	# in this case, we simply use a timer:	635	# in this case, we simply use a timer:
561	my $w = AnyEvent->timer (	636	my $w = AnyEvent->timer (
562	after => 1,	637	after => 1,
563	cb => sub { $result_ready->send },	638	cb => sub { $timer_fired->send },
564	);	639	);
565		640
566	# this "blocks" (while handling events) till the callback	641	# this "blocks" (while handling events) till the callback
567	# calls -<send	642	# calls ->send
568	$result_ready->recv;	643	$timer_fired->recv;
569		644
570	Example: wait for a timer, but take advantage of the fact that condition	645	Example: wait for a timer, but take advantage of the fact that condition
571	variables are also callable directly.	646	variables are also callable directly.
572		647
573	my $done = AnyEvent->condvar;	648	my $done = AnyEvent->condvar;
…		…
616	they were a code reference). Calling them directly is the same as calling	691	they were a code reference). Calling them directly is the same as calling
617	C<send>.	692	C<send>.
618		693
619	=item $cv->croak ($error)	694	=item $cv->croak ($error)
620		695
621	Similar to send, but causes all call's to C<< ->recv >> to invoke	696	Similar to send, but causes all calls to C<< ->recv >> to invoke
622	C<Carp::croak> with the given error message/object/scalar.	697	C<Carp::croak> with the given error message/object/scalar.
623		698
624	This can be used to signal any errors to the condition variable	699	This can be used to signal any errors to the condition variable
625	user/consumer. Doing it this way instead of calling C<croak> directly	700	user/consumer. Doing it this way instead of calling C<croak> directly
626	delays the error detetcion, but has the overwhelmign advantage that it	701	delays the error detection, but has the overwhelming advantage that it
627	diagnoses the error at the place where the result is expected, and not	702	diagnoses the error at the place where the result is expected, and not
628	deep in some event clalback without connection to the actual code causing	703	deep in some event callback with no connection to the actual code causing
629	the problem.	704	the problem.
630		705
631	=item $cv->begin ([group callback])	706	=item $cv->begin ([group callback])
632		707
633	=item $cv->end	708	=item $cv->end
…		…
636	one. For example, a function that pings many hosts in parallel might want	711	one. For example, a function that pings many hosts in parallel might want
637	to use a condition variable for the whole process.	712	to use a condition variable for the whole process.
638		713
639	Every call to C<< ->begin >> will increment a counter, and every call to	714	Every call to C<< ->begin >> will increment a counter, and every call to
640	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	715	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
641	>>, the (last) callback passed to C<begin> will be executed. That callback	716	>>, the (last) callback passed to C<begin> will be executed, passing the
642	is I<supposed> to call C<< ->send >>, but that is not required. If no	717	condvar as first argument. That callback is I<supposed> to call C<< ->send
643	callback was set, C<send> will be called without any arguments.	718	>>, but that is not required. If no group callback was set, C<send> will
		719	be called without any arguments.
644		720
645	You can think of C<< $cv->send >> giving you an OR condition (one call	721	You can think of C<< $cv->send >> giving you an OR condition (one call
646	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	722	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
647	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	723	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
648		724
…		…
670	one call to C<begin>, so the condvar waits for all calls to C<end> before	746	one call to C<begin>, so the condvar waits for all calls to C<end> before
671	sending.	747	sending.
672		748
673	The ping example mentioned above is slightly more complicated, as the	749	The ping example mentioned above is slightly more complicated, as the
674	there are results to be passwd back, and the number of tasks that are	750	there are results to be passwd back, and the number of tasks that are
675	begung can potentially be zero:	751	begun can potentially be zero:
676		752
677	my $cv = AnyEvent->condvar;	753	my $cv = AnyEvent->condvar;
678		754
679	my %result;	755	my %result;
680	$cv->begin (sub { $cv->send (\%result) });	756	$cv->begin (sub { shift->send (\%result) });
681		757
682	for my $host (@list_of_hosts) {	758	for my $host (@list_of_hosts) {
683	$cv->begin;	759	$cv->begin;
684	ping_host_then_call_callback $host, sub {	760	ping_host_then_call_callback $host, sub {
685	$result{$host} = ...;	761	$result{$host} = ...;
…		…
687	};	763	};
688	}	764	}
689		765
690	$cv->end;	766	$cv->end;
691		767
		768	...
		769
		770	my $results = $cv->recv;
		771
692	This code fragment supposedly pings a number of hosts and calls	772	This code fragment supposedly pings a number of hosts and calls
693	C<send> after results for all then have have been gathered - in any	773	C<send> after results for all then have have been gathered - in any
694	order. To achieve this, the code issues a call to C<begin> when it starts	774	order. To achieve this, the code issues a call to C<begin> when it starts
695	each ping request and calls C<end> when it has received some result for	775	each ping request and calls C<end> when it has received some result for
696	it. Since C<begin> and C<end> only maintain a counter, the order in which	776	it. Since C<begin> and C<end> only maintain a counter, the order in which
…		…
701	to be called once the counter reaches C<0>, and second, it ensures that	781	to be called once the counter reaches C<0>, and second, it ensures that
702	C<send> is called even when C<no> hosts are being pinged (the loop	782	C<send> is called even when C<no> hosts are being pinged (the loop
703	doesn't execute once).	783	doesn't execute once).
704		784
705	This is the general pattern when you "fan out" into multiple (but	785	This is the general pattern when you "fan out" into multiple (but
706	potentially none) subrequests: use an outer C<begin>/C<end> pair to set	786	potentially zero) subrequests: use an outer C<begin>/C<end> pair to set
707	the callback and ensure C<end> is called at least once, and then, for each	787	the callback and ensure C<end> is called at least once, and then, for each
708	subrequest you start, call C<begin> and for each subrequest you finish,	788	subrequest you start, call C<begin> and for each subrequest you finish,
709	call C<end>.	789	call C<end>.
710		790
711	=back	791	=back
…		…
718	=over 4	798	=over 4
719		799
720	=item $cv->recv	800	=item $cv->recv
721		801
722	Wait (blocking if necessary) until the C<< ->send >> or C<< ->croak	802	Wait (blocking if necessary) until the C<< ->send >> or C<< ->croak
723	>> methods have been called on c<$cv>, while servicing other watchers	803	>> methods have been called on C<$cv>, while servicing other watchers
724	normally.	804	normally.
725		805
726	You can only wait once on a condition - additional calls are valid but	806	You can only wait once on a condition - additional calls are valid but
727	will return immediately.	807	will return immediately.
728		808
…		…
731		811
732	In list context, all parameters passed to C<send> will be returned,	812	In list context, all parameters passed to C<send> will be returned,
733	in scalar context only the first one will be returned.	813	in scalar context only the first one will be returned.
734		814
735	Note that doing a blocking wait in a callback is not supported by any	815	Note that doing a blocking wait in a callback is not supported by any
736	event loop, that is, recursive invocation of a blocking C<< ->recv	816	event loop, that is, recursive invocation of a blocking C<< ->recv >> is
737	>> is not allowed, and the C<recv> call will C<croak> if such a	817	not allowed and the C<recv> call will C<croak> if such a condition is
738	condition is detected. This condition can be slightly loosened by using	818	detected. This requirement can be dropped by relying on L<Coro::AnyEvent>
739	L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from	819	, which allows you to do a blocking C<< ->recv >> from any thread
740	any thread that doesn't run the event loop itself.	820	that doesn't run the event loop itself. L<Coro::AnyEvent> is loaded
		821	automatically when L<Coro> is used with L<AnyEvent>, so code does not need
		822	to do anything special to take advantage of that: any code that would
		823	normally block your program because it calls C<recv>, be executed in an
		824	C<async> thread instead without blocking other threads.
741		825
742	Not all event models support a blocking wait - some die in that case	826	Not all event models support a blocking wait - some die in that case
743	(programs might want to do that to stay interactive), so I<if you are	827	(programs might want to do that to stay interactive), so I<if you are
744	using this from a module, never require a blocking wait>. Instead, let the	828	using this from a module, never require a blocking wait>. Instead, let the
745	caller decide whether the call will block or not (for example, by coupling	829	caller decide whether the call will block or not (for example, by coupling
746	condition variables with some kind of request results and supporting	830	condition variables with some kind of request results and supporting
747	callbacks so the caller knows that getting the result will not block,	831	callbacks so the caller knows that getting the result will not block,
748	while still supporting blocking waits if the caller so desires).	832	while still supporting blocking waits if the caller so desires).
749		833
750	You can ensure that C<< -recv >> never blocks by setting a callback and	834	You can ensure that C<< ->recv >> never blocks by setting a callback and
751	only calling C<< ->recv >> from within that callback (or at a later	835	only calling C<< ->recv >> from within that callback (or at a later
752	time). This will work even when the event loop does not support blocking	836	time). This will work even when the event loop does not support blocking
753	waits otherwise.	837	waits otherwise.
754		838
755	=item $bool = $cv->ready	839	=item $bool = $cv->ready
…		…
761		845
762	This is a mutator function that returns the callback set and optionally	846	This is a mutator function that returns the callback set and optionally
763	replaces it before doing so.	847	replaces it before doing so.
764		848
765	The callback will be called when the condition becomes "true", i.e. when	849	The callback will be called when the condition becomes "true", i.e. when
766	C<send> or C<croak> are called, with the only argument being the condition	850	C<send> or C<croak> are called, with the only argument being the
767	variable itself. Calling C<recv> inside the callback or at any later time	851	condition variable itself. If the condition is already true, the
768	is guaranteed not to block.	852	callback is called immediately when it is set. Calling C<recv> inside
		853	the callback or at any later time is guaranteed not to block.
769		854
770	=back	855	=back
771		856
772	=head1 SUPPORTED EVENT LOOPS/BACKENDS	857	=head1 SUPPORTED EVENT LOOPS/BACKENDS
773		858
…		…
776	=over 4	861	=over 4
777		862
778	=item Backends that are autoprobed when no other event loop can be found.	863	=item Backends that are autoprobed when no other event loop can be found.
779		864
780	EV is the preferred backend when no other event loop seems to be in	865	EV is the preferred backend when no other event loop seems to be in
781	use. If EV is not installed, then AnyEvent will try Event, and, failing	866	use. If EV is not installed, then AnyEvent will fall back to its own
782	that, will fall back to its own pure-perl implementation, which is	867	pure-perl implementation, which is available everywhere as it comes with
783	available everywhere as it comes with AnyEvent itself.	868	AnyEvent itself.
784		869
785	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	870	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
786	AnyEvent::Impl::Event based on Event, very stable, few glitches.
787	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	871	AnyEvent::Impl::Perl pure-perl AnyEvent::Loop, fast and portable.
788		872
789	=item Backends that are transparently being picked up when they are used.	873	=item Backends that are transparently being picked up when they are used.
790		874
791	These will be used when they are currently loaded when the first watcher	875	These will be used if they are already loaded when the first watcher
792	is created, in which case it is assumed that the application is using	876	is created, in which case it is assumed that the application is using
793	them. This means that AnyEvent will automatically pick the right backend	877	them. This means that AnyEvent will automatically pick the right backend
794	when the main program loads an event module before anything starts to	878	when the main program loads an event module before anything starts to
795	create watchers. Nothing special needs to be done by the main program.	879	create watchers. Nothing special needs to be done by the main program.
796		880
		881	AnyEvent::Impl::Event based on Event, very stable, few glitches.
797	AnyEvent::Impl::Glib based on Glib, slow but very stable.	882	AnyEvent::Impl::Glib based on Glib, slow but very stable.
798	AnyEvent::Impl::Tk based on Tk, very broken.	883	AnyEvent::Impl::Tk based on Tk, very broken.
799	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	884	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
800	AnyEvent::Impl::POE based on POE, very slow, some limitations.	885	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		886	AnyEvent::Impl::Irssi used when running within irssi.
		887	AnyEvent::Impl::IOAsync based on IO::Async.
		888	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
		889	AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
801		890
802	=item Backends with special needs.	891	=item Backends with special needs.
803		892
804	Qt requires the Qt::Application to be instantiated first, but will	893	Qt requires the Qt::Application to be instantiated first, but will
805	otherwise be picked up automatically. As long as the main program	894	otherwise be picked up automatically. As long as the main program
806	instantiates the application before any AnyEvent watchers are created,	895	instantiates the application before any AnyEvent watchers are created,
807	everything should just work.	896	everything should just work.
808		897
809	AnyEvent::Impl::Qt based on Qt.	898	AnyEvent::Impl::Qt based on Qt.
810		899
811	Support for IO::Async can only be partial, as it is too broken and
812	architecturally limited to even support the AnyEvent API. It also
813	is the only event loop that needs the loop to be set explicitly, so
814	it can only be used by a main program knowing about AnyEvent. See
815	L<AnyEvent::Impl::Async> for the gory details.
816
817	AnyEvent::Impl::IOAsync based on IO::Async, cannot be autoprobed.
818
819	=item Event loops that are indirectly supported via other backends.	900	=item Event loops that are indirectly supported via other backends.
820		901
821	Some event loops can be supported via other modules:	902	Some event loops can be supported via other modules:
822		903
823	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.	904	There is no direct support for WxWidgets (L<Wx>) or L<Prima>.
…		…
848	Contains C<undef> until the first watcher is being created, before the	929	Contains C<undef> until the first watcher is being created, before the
849	backend has been autodetected.	930	backend has been autodetected.
850		931
851	Afterwards it contains the event model that is being used, which is the	932	Afterwards it contains the event model that is being used, which is the
852	name of the Perl class implementing the model. This class is usually one	933	name of the Perl class implementing the model. This class is usually one
853	of the C<AnyEvent::Impl:xxx> modules, but can be any other class in the	934	of the C<AnyEvent::Impl::xxx> modules, but can be any other class in the
854	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it	935	case AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode> it
855	will be C<urxvt::anyevent>).	936	will be C<urxvt::anyevent>).
856		937
857	=item AnyEvent::detect	938	=item AnyEvent::detect
858		939
859	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	940	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
860	if necessary. You should only call this function right before you would	941	if necessary. You should only call this function right before you would
861	have created an AnyEvent watcher anyway, that is, as late as possible at	942	have created an AnyEvent watcher anyway, that is, as late as possible at
862	runtime, and not e.g. while initialising of your module.	943	runtime, and not e.g. during initialisation of your module.
		944
		945	The effect of calling this function is as if a watcher had been created
		946	(specifically, actions that happen "when the first watcher is created"
		947	happen when calling detetc as well).
863		948
864	If you need to do some initialisation before AnyEvent watchers are	949	If you need to do some initialisation before AnyEvent watchers are
865	created, use C<post_detect>.	950	created, use C<post_detect>.
866		951
867	=item $guard = AnyEvent::post_detect { BLOCK }	952	=item $guard = AnyEvent::post_detect { BLOCK }
868		953
869	Arranges for the code block to be executed as soon as the event model is	954	Arranges for the code block to be executed as soon as the event model is
870	autodetected (or immediately if this has already happened).	955	autodetected (or immediately if that has already happened).
871		956
872	The block will be executed I<after> the actual backend has been detected	957	The block will be executed I<after> the actual backend has been detected
873	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been	958	(C<$AnyEvent::MODEL> is set), but I<before> any watchers have been
874	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do	959	created, so it is possible to e.g. patch C<@AnyEvent::ISA> or do
875	other initialisations - see the sources of L<AnyEvent::Strict> or	960	other initialisations - see the sources of L<AnyEvent::Strict> or
…		…
884	that automatically removes the callback again when it is destroyed (or	969	that automatically removes the callback again when it is destroyed (or
885	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for	970	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for
886	a case where this is useful.	971	a case where this is useful.
887		972
888	Example: Create a watcher for the IO::AIO module and store it in	973	Example: Create a watcher for the IO::AIO module and store it in
889	C<$WATCHER>. Only do so after the event loop is initialised, though.	974	C<$WATCHER>, but do so only do so after the event loop is initialised.
890		975
891	our WATCHER;	976	our WATCHER;
892		977
893	my $guard = AnyEvent::post_detect {	978	my $guard = AnyEvent::post_detect {
894	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);	979	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);
…		…
902	$WATCHER ||= $guard;	987	$WATCHER ||= $guard;
903		988
904	=item @AnyEvent::post_detect	989	=item @AnyEvent::post_detect
905		990
906	If there are any code references in this array (you can C<push> to it	991	If there are any code references in this array (you can C<push> to it
907	before or after loading AnyEvent), then they will called directly after	992	before or after loading AnyEvent), then they will be called directly
908	the event loop has been chosen.	993	after the event loop has been chosen.
909		994
910	You should check C<$AnyEvent::MODEL> before adding to this array, though:	995	You should check C<$AnyEvent::MODEL> before adding to this array, though:
911	if it is defined then the event loop has already been detected, and the	996	if it is defined then the event loop has already been detected, and the
912	array will be ignored.	997	array will be ignored.
913		998
914	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	999	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
915	it,as it takes care of these details.	1000	it, as it takes care of these details.
916		1001
917	This variable is mainly useful for modules that can do something useful	1002	This variable is mainly useful for modules that can do something useful
918	when AnyEvent is used and thus want to know when it is initialised, but do	1003	when AnyEvent is used and thus want to know when it is initialised, but do
919	not need to even load it by default. This array provides the means to hook	1004	not need to even load it by default. This array provides the means to hook
920	into AnyEvent passively, without loading it.	1005	into AnyEvent passively, without loading it.
921		1006
		1007	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		1008	together, you could put this into Coro (this is the actual code used by
		1009	Coro to accomplish this):
		1010
		1011	if (defined $AnyEvent::MODEL) {
		1012	# AnyEvent already initialised, so load Coro::AnyEvent
		1013	require Coro::AnyEvent;
		1014	} else {
		1015	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		1016	# as soon as it is
		1017	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		1018	}
		1019
		1020	=item AnyEvent::postpone { BLOCK }
		1021
		1022	Arranges for the block to be executed as soon as possible, but not before
		1023	the call itself returns. In practise, the block will be executed just
		1024	before the event loop polls for new events, or shortly afterwards.
		1025
		1026	This function never returns anything (to make the C<return postpone { ...
		1027	}> idiom more useful.
		1028
		1029	To understand the usefulness of this function, consider a function that
		1030	asynchronously does something for you and returns some transaction
		1031	object or guard to let you cancel the operation. For example,
		1032	C<AnyEvent::Socket::tcp_connect>:
		1033
		1034	# start a conenction attempt unless one is active
		1035	$self->{connect_guard} ||= AnyEvent::Socket::tcp_connect "www.example.net", 80, sub {
		1036	delete $self->{connect_guard};
		1037	...
		1038	};
		1039
		1040	Imagine that this function could instantly call the callback, for
		1041	example, because it detects an obvious error such as a negative port
		1042	number. Invoking the callback before the function returns causes problems
		1043	however: the callback will be called and will try to delete the guard
		1044	object. But since the function hasn't returned yet, there is nothing to
		1045	delete. When the function eventually returns it will assign the guard
		1046	object to C<< $self->{connect_guard} >>, where it will likely never be
		1047	deleted, so the program thinks it is still trying to connect.
		1048
		1049	This is where C<AnyEvent::postpone> should be used. Instead of calling the
		1050	callback directly on error:
		1051
		1052	$cb->(undef), return # signal error to callback, BAD!
		1053	if $some_error_condition;
		1054
		1055	It should use C<postpone>:
		1056
		1057	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
		1058	if $some_error_condition;
		1059
		1060	=item AnyEvent::log $level, $msg[, @args]
		1061
		1062	Log the given C<$msg> at the given C<$level>.
		1063
		1064	If L<AnyEvent::Log> is not loaded then this function makes a simple test
		1065	to see whether the message will be logged. If the test succeeds it will
		1066	load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
		1067	the L<AnyEvent::Log> documentation for details.
		1068
		1069	If the test fails it will simply return. Right now this happens when a
		1070	numerical loglevel is used and it is larger than the level specified via
		1071	C<$ENV{PERL_ANYEVENT_VERBOSE}>.
		1072
		1073	If you want to sprinkle loads of logging calls around your code, consider
		1074	creating a logger callback with the C<AnyEvent::Log::logger> function,
		1075	which can reduce typing, codesize and can reduce the logging overhead
		1076	enourmously.
		1077
922	=back	1078	=back
923		1079
924	=head1 WHAT TO DO IN A MODULE	1080	=head1 WHAT TO DO IN A MODULE
925		1081
926	As a module author, you should C<use AnyEvent> and call AnyEvent methods	1082	As a module author, you should C<use AnyEvent> and call AnyEvent methods
…		…
936	because it will stall the whole program, and the whole point of using	1092	because it will stall the whole program, and the whole point of using
937	events is to stay interactive.	1093	events is to stay interactive.
938		1094
939	It is fine, however, to call C<< ->recv >> when the user of your module	1095	It is fine, however, to call C<< ->recv >> when the user of your module
940	requests it (i.e. if you create a http request object ad have a method	1096	requests it (i.e. if you create a http request object ad have a method
941	called C<results> that returns the results, it should call C<< ->recv >>	1097	called C<results> that returns the results, it may call C<< ->recv >>
942	freely, as the user of your module knows what she is doing. always).	1098	freely, as the user of your module knows what she is doing. Always).
943		1099
944	=head1 WHAT TO DO IN THE MAIN PROGRAM	1100	=head1 WHAT TO DO IN THE MAIN PROGRAM
945		1101
946	There will always be a single main program - the only place that should	1102	There will always be a single main program - the only place that should
947	dictate which event model to use.	1103	dictate which event model to use.
948		1104
949	If it doesn't care, it can just "use AnyEvent" and use it itself, or not	1105	If the program is not event-based, it need not do anything special, even
950	do anything special (it does not need to be event-based) and let AnyEvent	1106	when it depends on a module that uses an AnyEvent. If the program itself
951	decide which implementation to chose if some module relies on it.	1107	uses AnyEvent, but does not care which event loop is used, all it needs
		1108	to do is C<use AnyEvent>. In either case, AnyEvent will choose the best
		1109	available loop implementation.
952		1110
953	If the main program relies on a specific event model - for example, in	1111	If the main program relies on a specific event model - for example, in
954	Gtk2 programs you have to rely on the Glib module - you should load the	1112	Gtk2 programs you have to rely on the Glib module - you should load the
955	event module before loading AnyEvent or any module that uses it: generally	1113	event module before loading AnyEvent or any module that uses it: generally
956	speaking, you should load it as early as possible. The reason is that	1114	speaking, you should load it as early as possible. The reason is that
957	modules might create watchers when they are loaded, and AnyEvent will	1115	modules might create watchers when they are loaded, and AnyEvent will
958	decide on the event model to use as soon as it creates watchers, and it	1116	decide on the event model to use as soon as it creates watchers, and it
959	might chose the wrong one unless you load the correct one yourself.	1117	might choose the wrong one unless you load the correct one yourself.
960		1118
961	You can chose to use a pure-perl implementation by loading the	1119	You can chose to use a pure-perl implementation by loading the
962	C<AnyEvent::Impl::Perl> module, which gives you similar behaviour	1120	C<AnyEvent::Loop> module, which gives you similar behaviour
963	everywhere, but letting AnyEvent chose the model is generally better.	1121	everywhere, but letting AnyEvent chose the model is generally better.
964		1122
965	=head2 MAINLOOP EMULATION	1123	=head2 MAINLOOP EMULATION
966		1124
967	Sometimes (often for short test scripts, or even standalone programs who	1125	Sometimes (often for short test scripts, or even standalone programs who
…		…
980		1138
981		1139
982	=head1 OTHER MODULES	1140	=head1 OTHER MODULES
983		1141
984	The following is a non-exhaustive list of additional modules that use	1142	The following is a non-exhaustive list of additional modules that use
985	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1143	AnyEvent as a client and can therefore be mixed easily with other
986	modules and other event loops in the same program. Some of the modules	1144	AnyEvent modules and other event loops in the same program. Some of the
987	come with AnyEvent, most are available via CPAN.	1145	modules come as part of AnyEvent, the others are available via CPAN (see
		1146	L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
		1147	a longer non-exhaustive list), and the list is heavily biased towards
		1148	modules of the AnyEvent author himself :)
988		1149
989	=over 4	1150	=over 4
990		1151
991	=item L<AnyEvent::Util>	1152	=item L<AnyEvent::Util>
992		1153
993	Contains various utility functions that replace often-used but blocking	1154	Contains various utility functions that replace often-used blocking
994	functions such as C<inet_aton> by event-/callback-based versions.	1155	functions such as C<inet_aton> with event/callback-based versions.
995		1156
996	=item L<AnyEvent::Socket>	1157	=item L<AnyEvent::Socket>
997		1158
998	Provides various utility functions for (internet protocol) sockets,	1159	Provides various utility functions for (internet protocol) sockets,
999	addresses and name resolution. Also functions to create non-blocking tcp	1160	addresses and name resolution. Also functions to create non-blocking tcp
…		…
1001		1162
1002	=item L<AnyEvent::Handle>	1163	=item L<AnyEvent::Handle>
1003		1164
1004	Provide read and write buffers, manages watchers for reads and writes,	1165	Provide read and write buffers, manages watchers for reads and writes,
1005	supports raw and formatted I/O, I/O queued and fully transparent and	1166	supports raw and formatted I/O, I/O queued and fully transparent and
1006	non-blocking SSL/TLS (via L<AnyEvent::TLS>.	1167	non-blocking SSL/TLS (via L<AnyEvent::TLS>).
1007		1168
1008	=item L<AnyEvent::DNS>	1169	=item L<AnyEvent::DNS>
1009		1170
1010	Provides rich asynchronous DNS resolver capabilities.	1171	Provides rich asynchronous DNS resolver capabilities.
1011		1172
		1173	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
		1174
		1175	Implement event-based interfaces to the protocols of the same name (for
		1176	the curious, IGS is the International Go Server and FCP is the Freenet
		1177	Client Protocol).
		1178
1012	=item L<AnyEvent::HTTP>	1179	=item L<AnyEvent::AIO>
1013		1180
1014	A simple-to-use HTTP library that is capable of making a lot of concurrent	1181	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1015	HTTP requests.	1182	toolbox of every event programmer. AnyEvent::AIO transparently fuses
		1183	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
		1184	file I/O, and much more.
		1185
		1186	=item L<AnyEvent::Filesys::Notify>
		1187
		1188	AnyEvent is good for non-blocking stuff, but it can't detect file or
		1189	path changes (e.g. "watch this directory for new files", "watch this
		1190	file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
		1191	do just that in a portbale fashion, supporting inotify on GNU/Linux and
		1192	some weird, without doubt broken, stuff on OS X to monitor files. It can
		1193	fall back to blocking scans at regular intervals transparently on other
		1194	platforms, so it's about as portable as it gets.
		1195
		1196	(I haven't used it myself, but I haven't heard anybody complaining about
		1197	it yet).
		1198
		1199	=item L<AnyEvent::DBI>
		1200
		1201	Executes L<DBI> requests asynchronously in a proxy process for you,
		1202	notifying you in an event-based way when the operation is finished.
1016		1203
1017	=item L<AnyEvent::HTTPD>	1204	=item L<AnyEvent::HTTPD>
1018		1205
1019	Provides a simple web application server framework.	1206	A simple embedded webserver.
1020		1207
1021	=item L<AnyEvent::FastPing>	1208	=item L<AnyEvent::FastPing>
1022		1209
1023	The fastest ping in the west.	1210	The fastest ping in the west.
1024		1211
1025	=item L<AnyEvent::DBI>
1026
1027	Executes L<DBI> requests asynchronously in a proxy process.
1028
1029	=item L<AnyEvent::AIO>
1030
1031	Truly asynchronous I/O, should be in the toolbox of every event
1032	programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent
1033	together.
1034
1035	=item L<AnyEvent::BDB>
1036
1037	Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses
1038	L<BDB> and AnyEvent together.
1039
1040	=item L<AnyEvent::GPSD>
1041
1042	A non-blocking interface to gpsd, a daemon delivering GPS information.
1043
1044	=item L<AnyEvent::IRC>
1045
1046	AnyEvent based IRC client module family (replacing the older Net::IRC3).
1047
1048	=item L<AnyEvent::XMPP>
1049
1050	AnyEvent based XMPP (Jabber protocol) module family (replacing the older
1051	Net::XMPP2>.
1052
1053	=item L<AnyEvent::IGS>
1054
1055	A non-blocking interface to the Internet Go Server protocol (used by
1056	L<App::IGS>).
1057
1058	=item L<Net::FCP>
1059
1060	AnyEvent-based implementation of the Freenet Client Protocol, birthplace
1061	of AnyEvent.
1062
1063	=item L<Event::ExecFlow>
1064
1065	High level API for event-based execution flow control.
1066
1067	=item L<Coro>	1212	=item L<Coro>
1068		1213
1069	Has special support for AnyEvent via L<Coro::AnyEvent>.	1214	Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
		1215	to simply invert the flow control - don't call us, we will call you:
		1216
		1217	async {
		1218	Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
		1219	print "5 seconds later!\n";
		1220
		1221	Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
		1222	my $line = <STDIN>; # works for ttys
		1223
		1224	AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
		1225	my ($body, $hdr) = Coro::rouse_wait;
		1226	};
1070		1227
1071	=back	1228	=back
1072		1229
1073	=cut	1230	=cut
1074		1231
1075	package AnyEvent;	1232	package AnyEvent;
1076		1233
1077	# basically a tuned-down version of common::sense	1234	# basically a tuned-down version of common::sense
1078	sub common_sense {	1235	sub common_sense {
1079	# no warnings	1236	# from common:.sense 3.5
1080	${^WARNING_BITS} ^= ${^WARNING_BITS};	1237	local $^W;
1081	# use strict vars subs	1238	${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf0\x0f\xc0\xf0\xfc\x33\x00";
		1239	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1082	$^H |= 0x00000600;	1240	$^H |= 0x00000600;
1083	}	1241	}
1084		1242
1085	BEGIN { AnyEvent::common_sense }	1243	BEGIN { AnyEvent::common_sense }
1086		1244
1087	use Carp ();	1245	use Carp ();
1088		1246
1089	our $VERSION = 4.86;	1247	our $VERSION = '7.04';
1090	our $MODEL;	1248	our $MODEL;
1091
1092	our $AUTOLOAD;
1093	our @ISA;	1249	our @ISA;
1094
1095	our @REGISTRY;	1250	our @REGISTRY;
1096
1097	our $WIN32;
1098
1099	our $VERBOSE;	1251	our $VERBOSE;
		1252	our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred
		1253	our $MAX_SIGNAL_LATENCY = $ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY} || 10; # executes after the BEGIN block below (tainting!)
1100		1254
1101	BEGIN {	1255	BEGIN {
1102	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1256	require "AnyEvent/constants.pl";
		1257
1103	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1258	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1104		1259
1105	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1260	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1106	if ${^TAINT};	1261	if ${^TAINT};
1107		1262
1108	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1263	$ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
		1264	for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1109		1265
1110	}	1266	@ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
		1267	if ${^TAINT};
1111		1268
1112	our $MAX_SIGNAL_LATENCY = 10;	1269	# $ENV{PERL_ANYEVENT_xxx} now valid
1113		1270
1114	our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred	1271	$VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 4;
1115		1272
1116	{
1117	my $idx;	1273	my $idx;
1118	$PROTOCOL{$_} = ++$idx	1274	$PROTOCOL{$_} = ++$idx
1119	for reverse split /\s*,\s*/,	1275	for reverse split /\s*,\s*/,
1120	$ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";	1276	$ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6";
1121	}	1277	}
1122		1278
		1279	our @post_detect;
		1280
		1281	sub post_detect(&) {
		1282	my ($cb) = @_;
		1283
		1284	push @post_detect, $cb;
		1285
		1286	defined wantarray
		1287	? bless \$cb, "AnyEvent::Util::postdetect"
		1288	: ()
		1289	}
		1290
		1291	sub AnyEvent::Util::postdetect::DESTROY {
		1292	@post_detect = grep $_ != ${$_[0]}, @post_detect;
		1293	}
		1294
		1295	our $POSTPONE_W;
		1296	our @POSTPONE;
		1297
		1298	sub _postpone_exec {
		1299	undef $POSTPONE_W;
		1300
		1301	&{ shift @POSTPONE }
		1302	while @POSTPONE;
		1303	}
		1304
		1305	sub postpone(&) {
		1306	push @POSTPONE, shift;
		1307
		1308	$POSTPONE_W ||= AE::timer (0, 0, \&_postpone_exec);
		1309
		1310	()
		1311	}
		1312
		1313	sub log($$;@) {
		1314	# only load the big bloated module when we actually are about to log something
		1315	if ($_[0] <= ($VERBOSE || 1)) { # also catches non-numeric levels(!) and fatal
		1316	local ($!, $@);
		1317	require AnyEvent::Log; # among other things, sets $VERBOSE to 9
		1318	# AnyEvent::Log overwrites this function
		1319	goto &log;
		1320	}
		1321
		1322	0 # not logged
		1323	}
		1324
		1325	sub _logger($;$) {
		1326	my ($level, $renabled) = @_;
		1327
		1328	$$renabled = $level <= $VERBOSE;
		1329
		1330	my $logger = [(caller)[0], $level, $renabled];
		1331
		1332	$AnyEvent::Log::LOGGER{$logger+0} = $logger;
		1333
		1334	# return unless defined wantarray;
		1335	#
		1336	# require AnyEvent::Util;
		1337	# my $guard = AnyEvent::Util::guard (sub {
		1338	# # "clean up"
		1339	# delete $LOGGER{$logger+0};
		1340	# });
		1341	#
		1342	# sub {
		1343	# return 0 unless $$renabled;
		1344	#
		1345	# $guard if 0; # keep guard alive, but don't cause runtime overhead
		1346	# require AnyEvent::Log unless $AnyEvent::Log::VERSION;
		1347	# package AnyEvent::Log;
		1348	# _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time
		1349	# }
		1350	}
		1351
		1352	if (length $ENV{PERL_ANYEVENT_LOG}) {
		1353	require AnyEvent::Log; # AnyEvent::Log does the thing for us
		1354	}
		1355
1123	my @models = (	1356	our @models = (
1124	[EV:: => AnyEvent::Impl::EV::],	1357	[EV:: => AnyEvent::Impl::EV::],
1125	[Event:: => AnyEvent::Impl::Event::],
1126	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1358	[AnyEvent::Loop:: => AnyEvent::Impl::Perl::],
1127	# everything below here will not be autoprobed	1359	# everything below here will not (normally) be autoprobed
1128	# as the pureperl backend should work everywhere	1360	# as the pure perl backend should work everywhere
1129	# and is usually faster	1361	# and is usually faster
		1362	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package, so msut be near the top
		1363	[Event:: => AnyEvent::Impl::Event::], # slow, stable
1130	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1364	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
		1365	# everything below here should not be autoloaded
1131	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1366	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1132	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1367	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1133	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1368	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1134	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1369	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1135	[Wx:: => AnyEvent::Impl::POE::],	1370	[Wx:: => AnyEvent::Impl::POE::],
1136	[Prima:: => AnyEvent::Impl::POE::],	1371	[Prima:: => AnyEvent::Impl::POE::],
1137	# IO::Async is just too broken - we would need workarounds for its	1372	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1138	# byzantine signal and broken child handling, among others.	1373	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1139	# IO::Async is rather hard to detect, as it doesn't have any	1374	[FLTK:: => AnyEvent::Impl::FLTK::],
1140	# obvious default class.
1141	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1142	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1143	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
1144	);	1375	);
1145		1376
1146	our %method = map +($_ => 1),	1377	our @isa_hook;
		1378
		1379	sub _isa_set {
		1380	my @pkg = ("AnyEvent", (map $_->[0], grep defined, @isa_hook), $MODEL);
		1381
		1382	@{"$pkg[$_-1]::ISA"} = $pkg[$_]
		1383	for 1 .. $#pkg;
		1384
		1385	grep $_ && $_->[1], @isa_hook
		1386	and AE::_reset ();
		1387	}
		1388
		1389	# used for hooking AnyEvent::Strict and AnyEvent::Debug::Wrap into the class hierarchy
		1390	sub _isa_hook($$;$) {
		1391	my ($i, $pkg, $reset_ae) = @_;
		1392
		1393	$isa_hook[$i] = $pkg ? [$pkg, $reset_ae] : undef;
		1394
		1395	_isa_set;
		1396	}
		1397
		1398	# all autoloaded methods reserve the complete glob, not just the method slot.
		1399	# due to bugs in perls method cache implementation.
1147	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1400	our @methods = qw(io timer time now now_update signal child idle condvar);
1148		1401
1149	our @post_detect;
1150
1151	sub post_detect(&) {	1402	sub detect() {
1152	my ($cb) = @_;	1403	return $MODEL if $MODEL; # some programs keep references to detect
1153		1404
1154	if ($MODEL) {	1405	# IO::Async::Loop::AnyEvent is extremely evil, refuse to work with it
1155	$cb->();	1406	# the author knows about the problems and what it does to AnyEvent as a whole
		1407	# (and the ability of others to use AnyEvent), but simply wants to abuse AnyEvent
		1408	# anyway.
		1409	AnyEvent::log fatal => "IO::Async::Loop::AnyEvent detected - that module is broken by\n"
		1410	. "design, abuses internals and breaks AnyEvent - will not continue."
		1411	if exists $INC{"IO/Async/Loop/AnyEvent.pm"};
1156		1412
1157	undef	1413	local $!; # for good measure
		1414	local $SIG{__DIE__}; # we use eval
		1415
		1416	# free some memory
		1417	*detect = sub () { $MODEL };
		1418	# undef &func doesn't correctly update the method cache. grmbl.
		1419	# so we delete the whole glob. grmbl.
		1420	# otoh, perl doesn't let me undef an active usb, but it lets me free
		1421	# a glob with an active sub. hrm. i hope it works, but perl is
		1422	# usually buggy in this department. sigh.
		1423	delete @{"AnyEvent::"}{@methods};
		1424	undef @methods;
		1425
		1426	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
		1427	my $model = $1;
		1428	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
		1429	if (eval "require $model") {
		1430	AnyEvent::log 7 => "Loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
		1431	$MODEL = $model;
1158	} else {	1432	} else {
1159	push @post_detect, $cb;	1433	AnyEvent::log 4 => "Unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1160		1434	}
1161	defined wantarray
1162	? bless \$cb, "AnyEvent::Util::postdetect"
1163	: ()
1164	}	1435	}
1165	}
1166		1436
1167	sub AnyEvent::Util::postdetect::DESTROY {	1437	# check for already loaded models
1168	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1169	}
1170
1171	sub detect() {
1172	unless ($MODEL) {	1438	unless ($MODEL) {
1173	local $SIG{__DIE__};	1439	for (@REGISTRY, @models) {
1174		1440	my ($package, $model) = @$_;
1175	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1441	if (${"$package\::VERSION"} > 0) {
1176	my $model = "AnyEvent::Impl::$1";
1177	if (eval "require $model") {	1442	if (eval "require $model") {
		1443	AnyEvent::log 7 => "Autodetected model '$model', using it.";
1178	$MODEL = $model;	1444	$MODEL = $model;
1179	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1445	last;
1180	} else {	1446	} else {
1181	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1447	AnyEvent::log 8 => "Detected event loop $package, but cannot load '$model', skipping: $@";
		1448	}
1182	}	1449	}
1183	}	1450	}
1184		1451
1185	# check for already loaded models
1186	unless ($MODEL) {	1452	unless ($MODEL) {
		1453	# try to autoload a model
1187	for (@REGISTRY, @models) {	1454	for (@REGISTRY, @models) {
1188	my ($package, $model) = @$_;	1455	my ($package, $model) = @$_;
		1456	if (
		1457	eval "require $package"
1189	if (${"$package\::VERSION"} > 0) {	1458	and ${"$package\::VERSION"} > 0
1190	if (eval "require $model") {	1459	and eval "require $model"
		1460	) {
		1461	AnyEvent::log 7 => "Autoloaded model '$model', using it.";
1191	$MODEL = $model;	1462	$MODEL = $model;
1192	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1193	last;	1463	last;
1194	}
1195	}	1464	}
1196	}	1465	}
1197		1466
1198	unless ($MODEL) {
1199	# try to load a model
1200
1201	for (@REGISTRY, @models) {
1202	my ($package, $model) = @$_;
1203	if (eval "require $package"
1204	and ${"$package\::VERSION"} > 0
1205	and eval "require $model") {
1206	$MODEL = $model;
1207	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;
1208	last;
1209	}
1210	}
1211
1212	$MODEL	1467	$MODEL
1213	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1468	or AnyEvent::log fatal => "Backend autodetection failed - did you properly install AnyEvent?";
1214	}
1215	}	1469	}
1216
1217	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1218
1219	unshift @ISA, $MODEL;
1220
1221	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1222
1223	(shift @post_detect)->() while @post_detect;
1224	}	1470	}
1225		1471
		1472	# free memory only needed for probing
		1473	undef @models;
		1474	undef @REGISTRY;
		1475
		1476	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1477
		1478	# now nuke some methods that are overridden by the backend.
		1479	# SUPER usage is not allowed in these.
		1480	for (qw(time signal child idle)) {
		1481	undef &{"AnyEvent::Base::$_"}
		1482	if defined &{"$MODEL\::$_"};
		1483	}
		1484
		1485	_isa_set;
		1486
		1487	# we're officially open!
		1488
		1489	if ($ENV{PERL_ANYEVENT_STRICT}) {
		1490	require AnyEvent::Strict;
		1491	}
		1492
		1493	if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
		1494	require AnyEvent::Debug;
		1495	AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
		1496	}
		1497
		1498	if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
		1499	require AnyEvent::Socket;
		1500	require AnyEvent::Debug;
		1501
		1502	my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
		1503	$shell =~ s/\$\$/$$/g;
		1504
		1505	my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
		1506	$AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
		1507	}
		1508
		1509	# now the anyevent environment is set up as the user told us to, so
		1510	# call the actual user code - post detects
		1511
		1512	(shift @post_detect)->() while @post_detect;
		1513	undef @post_detect;
		1514
		1515	*post_detect = sub(&) {
		1516	shift->();
		1517
		1518	undef
		1519	};
		1520
1226	$MODEL	1521	$MODEL
1227	}	1522	}
1228		1523
1229	sub AUTOLOAD {	1524	for my $name (@methods) {
1230	(my $func = $AUTOLOAD) =~ s/.*://;	1525	*$name = sub {
1231		1526	detect;
1232	$method{$func}	1527	# we use goto because
1233	or Carp::croak "$func: not a valid method for AnyEvent objects";	1528	# a) it makes the thunk more transparent
1234		1529	# b) it allows us to delete the thunk later
1235	detect unless $MODEL;	1530	goto &{ UNIVERSAL::can AnyEvent => "SUPER::$name" }
1236		1531	};
1237	my $class = shift;
1238	$class->$func (@_);
1239	}	1532	}
1240		1533
1241	# utility function to dup a filehandle. this is used by many backends	1534	# utility function to dup a filehandle. this is used by many backends
1242	# to support binding more than one watcher per filehandle (they usually	1535	# to support binding more than one watcher per filehandle (they usually
1243	# allow only one watcher per fd, so we dup it to get a different one).	1536	# allow only one watcher per fd, so we dup it to get a different one).
…		…
1253	# we assume CLOEXEC is already set by perl in all important cases	1546	# we assume CLOEXEC is already set by perl in all important cases
1254		1547
1255	($fh2, $rw)	1548	($fh2, $rw)
1256	}	1549	}
1257		1550
		1551	=head1 SIMPLIFIED AE API
		1552
		1553	Starting with version 5.0, AnyEvent officially supports a second, much
		1554	simpler, API that is designed to reduce the calling, typing and memory
		1555	overhead by using function call syntax and a fixed number of parameters.
		1556
		1557	See the L<AE> manpage for details.
		1558
		1559	=cut
		1560
		1561	package AE;
		1562
		1563	our $VERSION = $AnyEvent::VERSION;
		1564
		1565	sub _reset() {
		1566	eval q{
		1567	# fall back to the main API by default - backends and AnyEvent::Base
		1568	# implementations can overwrite these.
		1569
		1570	sub io($$$) {
		1571	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1572	}
		1573
		1574	sub timer($$$) {
		1575	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1576	}
		1577
		1578	sub signal($$) {
		1579	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1580	}
		1581
		1582	sub child($$) {
		1583	AnyEvent->child (pid => $_[0], cb => $_[1])
		1584	}
		1585
		1586	sub idle($) {
		1587	AnyEvent->idle (cb => $_[0]);
		1588	}
		1589
		1590	sub cv(;&) {
		1591	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1592	}
		1593
		1594	sub now() {
		1595	AnyEvent->now
		1596	}
		1597
		1598	sub now_update() {
		1599	AnyEvent->now_update
		1600	}
		1601
		1602	sub time() {
		1603	AnyEvent->time
		1604	}
		1605
		1606	*postpone = \&AnyEvent::postpone;
		1607	*log = \&AnyEvent::log;
		1608	};
		1609	die if $@;
		1610	}
		1611
		1612	BEGIN { _reset }
		1613
1258	package AnyEvent::Base;	1614	package AnyEvent::Base;
1259		1615
1260	# default implementations for many methods	1616	# default implementations for many methods
1261		1617
1262	sub _time {	1618	sub time {
		1619	eval q{ # poor man's autoloading {}
1263	# probe for availability of Time::HiRes	1620	# probe for availability of Time::HiRes
1264	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1621	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1265	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1622	*time = sub { Time::HiRes::time () };
1266	*_time = \&Time::HiRes::time;	1623	*AE::time = \& Time::HiRes::time ;
		1624	*now = \&time;
		1625	AnyEvent::log 8 => "using Time::HiRes for sub-second timing accuracy.";
1267	# if (eval "use POSIX (); (POSIX::times())...	1626	# if (eval "use POSIX (); (POSIX::times())...
1268	} else {	1627	} else {
1269	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1628	*time = sub { CORE::time };
1270	*_time = sub { time }; # epic fail	1629	*AE::time = sub (){ CORE::time };
		1630	*now = \&time;
		1631	AnyEvent::log 3 => "Using built-in time(), no sub-second resolution!";
		1632	}
1271	}	1633	};
		1634	die if $@;
1272		1635
1273	&_time	1636	&time
1274	}	1637	}
1275		1638
1276	sub time { _time }	1639	*now = \&time;
1277	sub now { _time }
1278	sub now_update { }	1640	sub now_update { }
1279		1641
		1642	sub _poll {
		1643	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
		1644	}
		1645
1280	# default implementation for ->condvar	1646	# default implementation for ->condvar
		1647	# in fact, the default should not be overwritten
1281		1648
1282	sub condvar {	1649	sub condvar {
		1650	eval q{ # poor man's autoloading {}
		1651	*condvar = sub {
1283	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"	1652	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
		1653	};
		1654
		1655	*AE::cv = sub (;&) {
		1656	bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar"
		1657	};
		1658	};
		1659	die if $@;
		1660
		1661	&condvar
1284	}	1662	}
1285		1663
1286	# default implementation for ->signal	1664	# default implementation for ->signal
1287		1665
1288	our $HAVE_ASYNC_INTERRUPT;	1666	our $HAVE_ASYNC_INTERRUPT;
		1667
		1668	sub _have_async_interrupt() {
		1669	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1670	&& eval "use Async::Interrupt 1.02 (); 1")
		1671	unless defined $HAVE_ASYNC_INTERRUPT;
		1672
		1673	$HAVE_ASYNC_INTERRUPT
		1674	}
		1675
1289	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1676	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1290	our (%SIG_ASY, %SIG_ASY_W);	1677	our (%SIG_ASY, %SIG_ASY_W);
1291	our ($SIG_COUNT, $SIG_TW);	1678	our ($SIG_COUNT, $SIG_TW);
1292		1679
1293	sub _signal_exec {
1294	$HAVE_ASYNC_INTERRUPT
1295	? $SIGPIPE_R->drain
1296	: sysread $SIGPIPE_R, my $dummy, 9;
1297
1298	while (%SIG_EV) {
1299	for (keys %SIG_EV) {
1300	delete $SIG_EV{$_};
1301	$_->() for values %{ $SIG_CB{$_} || {} };
1302	}
1303	}
1304	}
1305
1306	# install a dumym wakeupw atcher to reduce signal catching latency	1680	# install a dummy wakeup watcher to reduce signal catching latency
		1681	# used by Impls
1307	sub _sig_add() {	1682	sub _sig_add() {
1308	unless ($SIG_COUNT++) {	1683	unless ($SIG_COUNT++) {
1309	# try to align timer on a full-second boundary, if possible	1684	# try to align timer on a full-second boundary, if possible
1310	my $NOW = AnyEvent->now;	1685	my $NOW = AE::now;
1311		1686
1312	$SIG_TW = AnyEvent->timer (	1687	$SIG_TW = AE::timer
1313	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1688	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1314	interval => $MAX_SIGNAL_LATENCY,	1689	$MAX_SIGNAL_LATENCY,
1315	cb => sub { }, # just for the PERL_ASYNC_CHECK	1690	sub { } # just for the PERL_ASYNC_CHECK
1316	);	1691	;
1317	}	1692	}
1318	}	1693	}
1319		1694
1320	sub _sig_del {	1695	sub _sig_del {
1321	undef $SIG_TW	1696	undef $SIG_TW
1322	unless --$SIG_COUNT;	1697	unless --$SIG_COUNT;
1323	}	1698	}
1324		1699
		1700	our $_sig_name_init; $_sig_name_init = sub {
		1701	eval q{ # poor man's autoloading {}
		1702	undef $_sig_name_init;
		1703
		1704	if (_have_async_interrupt) {
		1705	*sig2num = \&Async::Interrupt::sig2num;
		1706	*sig2name = \&Async::Interrupt::sig2name;
		1707	} else {
		1708	require Config;
		1709
		1710	my %signame2num;
		1711	@signame2num{ split ' ', $Config::Config{sig_name} }
		1712	= split ' ', $Config::Config{sig_num};
		1713
		1714	my @signum2name;
		1715	@signum2name[values %signame2num] = keys %signame2num;
		1716
		1717	*sig2num = sub($) {
		1718	$_[0] > 0 ? shift : $signame2num{+shift}
		1719	};
		1720	*sig2name = sub ($) {
		1721	$_[0] > 0 ? $signum2name[+shift] : shift
		1722	};
		1723	}
		1724	};
		1725	die if $@;
		1726	};
		1727
		1728	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1729	sub sig2name($) { &$_sig_name_init; &sig2name }
		1730
1325	sub _signal {	1731	sub signal {
1326	my (undef, %arg) = @_;	1732	eval q{ # poor man's autoloading {}
		1733	# probe for availability of Async::Interrupt
		1734	if (_have_async_interrupt) {
		1735	AnyEvent::log 8 => "Using Async::Interrupt for race-free signal handling.";
1327		1736
1328	my $signal = uc $arg{signal}	1737	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1329	or Carp::croak "required option 'signal' is missing";	1738	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1330		1739
1331	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1740	} else {
		1741	AnyEvent::log 8 => "Using emulated perl signal handling with latency timer.";
1332		1742
1333	if ($HAVE_ASYNC_INTERRUPT) {	1743	if (AnyEvent::WIN32) {
1334	# async::interrupt	1744	require AnyEvent::Util;
1335		1745
1336	$SIG_ASY{$signal} ||= do {	1746	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1337	my $asy = new Async::Interrupt	1747	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
1338	cb => sub { undef $SIG_EV{$signal} },	1748	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
1339	signal => $signal,	1749	} else {
1340	pipe => [$SIGPIPE_R->filenos],	1750	pipe $SIGPIPE_R, $SIGPIPE_W;
		1751	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
		1752	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
		1753
		1754	# not strictly required, as $^F is normally 2, but let's make sure...
		1755	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
		1756	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1341	;	1757	}
1342	$asy->pipe_autodrain (0);
1343		1758
1344	$asy	1759	$SIGPIPE_R
		1760	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1761
		1762	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1763	}
		1764
		1765	*signal = $HAVE_ASYNC_INTERRUPT
		1766	? sub {
		1767	my (undef, %arg) = @_;
		1768
		1769	# async::interrupt
		1770	my $signal = sig2num $arg{signal};
		1771	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1772
		1773	$SIG_ASY{$signal} ||= new Async::Interrupt
		1774	cb => sub { undef $SIG_EV{$signal} },
		1775	signal => $signal,
		1776	pipe => [$SIGPIPE_R->filenos],
		1777	pipe_autodrain => 0,
		1778	;
		1779
		1780	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1781	}
		1782	: sub {
		1783	my (undef, %arg) = @_;
		1784
		1785	# pure perl
		1786	my $signal = sig2name $arg{signal};
		1787	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1788
		1789	$SIG{$signal} ||= sub {
		1790	local $!;
		1791	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1792	undef $SIG_EV{$signal};
		1793	};
		1794
		1795	# can't do signal processing without introducing races in pure perl,
		1796	# so limit the signal latency.
		1797	_sig_add;
		1798
		1799	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
		1800	}
		1801	;
		1802
		1803	*AnyEvent::Base::signal::DESTROY = sub {
		1804	my ($signal, $cb) = @{$_[0]};
		1805
		1806	_sig_del;
		1807
		1808	delete $SIG_CB{$signal}{$cb};
		1809
		1810	$HAVE_ASYNC_INTERRUPT
		1811	? delete $SIG_ASY{$signal}
		1812	: # delete doesn't work with older perls - they then
		1813	# print weird messages, or just unconditionally exit
		1814	# instead of getting the default action.
		1815	undef $SIG{$signal}
		1816	unless keys %{ $SIG_CB{$signal} };
1345	};	1817	};
1346		1818
1347	} else {	1819	*_signal_exec = sub {
1348	# pure perl	1820	$HAVE_ASYNC_INTERRUPT
		1821	? $SIGPIPE_R->drain
		1822	: sysread $SIGPIPE_R, (my $dummy), 9;
1349		1823
1350	$SIG{$signal} ||= sub {	1824	while (%SIG_EV) {
1351	local $!;	1825	for (keys %SIG_EV) {
1352	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1826	delete $SIG_EV{$_};
1353	undef $SIG_EV{$signal};	1827	&$_ for values %{ $SIG_CB{$_} || {} };
		1828	}
		1829	}
1354	};	1830	};
1355
1356	# can't do signal processing without introducing races in pure perl,
1357	# so limit the signal latency.
1358	_sig_add;
1359	}	1831	};
		1832	die if $@;
1360		1833
1361	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1362	}
1363
1364	sub signal {
1365	# probe for availability of Async::Interrupt
1366	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
1367	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1368
1369	$HAVE_ASYNC_INTERRUPT = 1;
1370	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1371	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
1372
1373	} else {
1374	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1375
1376	require Fcntl;
1377
1378	if (AnyEvent::WIN32) {
1379	require AnyEvent::Util;
1380
1381	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1382	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1383	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1384	} else {
1385	pipe $SIGPIPE_R, $SIGPIPE_W;
1386	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1387	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1388
1389	# not strictly required, as $^F is normally 2, but let's make sure...
1390	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1391	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1392	}
1393
1394	$SIGPIPE_R
1395	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1396
1397	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1398	}
1399
1400	*signal = \&_signal;
1401	&signal	1834	&signal
1402	}
1403
1404	sub AnyEvent::Base::signal::DESTROY {
1405	my ($signal, $cb) = @{$_[0]};
1406
1407	_sig_del;
1408
1409	delete $SIG_CB{$signal}{$cb};
1410
1411	$HAVE_ASYNC_INTERRUPT
1412	? delete $SIG_ASY{$signal}
1413	: # delete doesn't work with older perls - they then
1414	# print weird messages, or just unconditionally exit
1415	# instead of getting the default action.
1416	undef $SIG{$signal}
1417	unless keys %{ $SIG_CB{$signal} };
1418	}	1835	}
1419		1836
1420	# default implementation for ->child	1837	# default implementation for ->child
1421		1838
1422	our %PID_CB;	1839	our %PID_CB;
1423	our $CHLD_W;	1840	our $CHLD_W;
1424	our $CHLD_DELAY_W;	1841	our $CHLD_DELAY_W;
1425	our $WNOHANG;
1426		1842
1427	sub _sigchld {	1843	# used by many Impl's
1428	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1844	sub _emit_childstatus($$) {
1429	$_->($pid, $?)	1845	my (undef, $rpid, $rstatus) = @_;
		1846
		1847	$_->($rpid, $rstatus)
1430	for values %{ $PID_CB{$pid} || {} },	1848	for values %{ $PID_CB{$rpid} || {} },
1431	values %{ $PID_CB{0} || {} };	1849	values %{ $PID_CB{0} || {} };
1432	}
1433	}	1850	}
1434		1851
1435	sub child {	1852	sub child {
		1853	eval q{ # poor man's autoloading {}
		1854	*_sigchld = sub {
		1855	my $pid;
		1856
		1857	AnyEvent->_emit_childstatus ($pid, $?)
		1858	while ($pid = waitpid -1, WNOHANG) > 0;
		1859	};
		1860
		1861	*child = sub {
1436	my (undef, %arg) = @_;	1862	my (undef, %arg) = @_;
1437		1863
1438	defined (my $pid = $arg{pid} + 0)	1864	my $pid = $arg{pid};
1439	or Carp::croak "required option 'pid' is missing";	1865	my $cb = $arg{cb};
1440		1866
1441	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1867	$PID_CB{$pid}{$cb+0} = $cb;
1442		1868
1443	# WNOHANG is almost cetrainly 1 everywhere
1444	$WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/
1445	? 1
1446	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1;
1447
1448	unless ($CHLD_W) {	1869	unless ($CHLD_W) {
1449	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1870	$CHLD_W = AE::signal CHLD => \&_sigchld;
1450	# child could be a zombie already, so make at least one round	1871	# child could be a zombie already, so make at least one round
1451	&_sigchld;	1872	&_sigchld;
1452	}	1873	}
1453		1874
1454	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1875	bless [$pid, $cb+0], "AnyEvent::Base::child"
1455	}	1876	};
1456		1877
1457	sub AnyEvent::Base::child::DESTROY {	1878	*AnyEvent::Base::child::DESTROY = sub {
1458	my ($pid, $cb) = @{$_[0]};	1879	my ($pid, $icb) = @{$_[0]};
1459		1880
1460	delete $PID_CB{$pid}{$cb};	1881	delete $PID_CB{$pid}{$icb};
1461	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1882	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1462		1883
1463	undef $CHLD_W unless keys %PID_CB;	1884	undef $CHLD_W unless keys %PID_CB;
		1885	};
		1886	};
		1887	die if $@;
		1888
		1889	&child
1464	}	1890	}
1465		1891
1466	# idle emulation is done by simply using a timer, regardless	1892	# idle emulation is done by simply using a timer, regardless
1467	# of whether the process is idle or not, and not letting	1893	# of whether the process is idle or not, and not letting
1468	# the callback use more than 50% of the time.	1894	# the callback use more than 50% of the time.
1469	sub idle {	1895	sub idle {
		1896	eval q{ # poor man's autoloading {}
		1897	*idle = sub {
1470	my (undef, %arg) = @_;	1898	my (undef, %arg) = @_;
1471		1899
1472	my ($cb, $w, $rcb) = $arg{cb};	1900	my ($cb, $w, $rcb) = $arg{cb};
1473		1901
1474	$rcb = sub {	1902	$rcb = sub {
1475	if ($cb) {	1903	if ($cb) {
1476	$w = _time;	1904	$w = AE::time;
1477	&$cb;	1905	&$cb;
1478	$w = _time - $w;	1906	$w = AE::time - $w;
1479		1907
1480	# never use more then 50% of the time for the idle watcher,	1908	# never use more then 50% of the time for the idle watcher,
1481	# within some limits	1909	# within some limits
1482	$w = 0.0001 if $w < 0.0001;	1910	$w = 0.0001 if $w < 0.0001;
1483	$w = 5 if $w > 5;	1911	$w = 5 if $w > 5;
1484		1912
1485	$w = AnyEvent->timer (after => $w, cb => $rcb);	1913	$w = AE::timer $w, 0, $rcb;
1486	} else {	1914	} else {
1487	# clean up...	1915	# clean up...
1488	undef $w;	1916	undef $w;
1489	undef $rcb;	1917	undef $rcb;
		1918	}
		1919	};
		1920
		1921	$w = AE::timer 0.05, 0, $rcb;
		1922
		1923	bless \\$cb, "AnyEvent::Base::idle"
1490	}	1924	};
		1925
		1926	*AnyEvent::Base::idle::DESTROY = sub {
		1927	undef $${$_[0]};
		1928	};
1491	};	1929	};
		1930	die if $@;
1492		1931
1493	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1932	&idle
1494
1495	bless \\$cb, "AnyEvent::Base::idle"
1496	}
1497
1498	sub AnyEvent::Base::idle::DESTROY {
1499	undef $${$_[0]};
1500	}	1933	}
1501		1934
1502	package AnyEvent::CondVar;	1935	package AnyEvent::CondVar;
1503		1936
1504	our @ISA = AnyEvent::CondVar::Base::;	1937	our @ISA = AnyEvent::CondVar::Base::;
		1938
		1939	# only to be used for subclassing
		1940	sub new {
		1941	my $class = shift;
		1942	bless AnyEvent->condvar (@_), $class
		1943	}
1505		1944
1506	package AnyEvent::CondVar::Base;	1945	package AnyEvent::CondVar::Base;
1507		1946
1508	#use overload	1947	#use overload
1509	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },	1948	# '&{}' => sub { my $self = shift; sub { $self->send (@_) } },
…		…
1519		1958
1520	sub _send {	1959	sub _send {
1521	# nop	1960	# nop
1522	}	1961	}
1523		1962
		1963	sub _wait {
		1964	AnyEvent->_poll until $_[0]{_ae_sent};
		1965	}
		1966
1524	sub send {	1967	sub send {
1525	my $cv = shift;	1968	my $cv = shift;
1526	$cv->{_ae_sent} = [@_];	1969	$cv->{_ae_sent} = [@_];
1527	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};	1970	(delete $cv->{_ae_cb})->($cv) if $cv->{_ae_cb};
1528	$cv->_send;	1971	$cv->_send;
…		…
1535		1978
1536	sub ready {	1979	sub ready {
1537	$_[0]{_ae_sent}	1980	$_[0]{_ae_sent}
1538	}	1981	}
1539		1982
1540	sub _wait {
1541	$WAITING
1542	and !$_[0]{_ae_sent}
1543	and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected";
1544
1545	local $WAITING = 1;
1546	AnyEvent->one_event while !$_[0]{_ae_sent};
1547	}
1548
1549	sub recv {	1983	sub recv {
		1984	unless ($_[0]{_ae_sent}) {
		1985	$WAITING
		1986	and Carp::croak "AnyEvent::CondVar: recursive blocking wait attempted";
		1987
		1988	local $WAITING = 1;
1550	$_[0]->_wait;	1989	$_[0]->_wait;
		1990	}
1551		1991
1552	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1992	$_[0]{_ae_croak}
1553	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1993	and Carp::croak $_[0]{_ae_croak};
		1994
		1995	wantarray
		1996	? @{ $_[0]{_ae_sent} }
		1997	: $_[0]{_ae_sent}[0]
1554	}	1998	}
1555		1999
1556	sub cb {	2000	sub cb {
1557	$_[0]{_ae_cb} = $_[1] if @_ > 1;	2001	my $cv = shift;
		2002
		2003	@_
		2004	and $cv->{_ae_cb} = shift
		2005	and $cv->{_ae_sent}
		2006	and (delete $cv->{_ae_cb})->($cv);
		2007
1558	$_[0]{_ae_cb}	2008	$cv->{_ae_cb}
1559	}	2009	}
1560		2010
1561	sub begin {	2011	sub begin {
1562	++$_[0]{_ae_counter};	2012	++$_[0]{_ae_counter};
1563	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	2013	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1568	&{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };	2018	&{ $_[0]{_ae_end_cb} || sub { $_[0]->send } };
1569	}	2019	}
1570		2020
1571	# undocumented/compatibility with pre-3.4	2021	# undocumented/compatibility with pre-3.4
1572	*broadcast = \&send;	2022	*broadcast = \&send;
1573	*wait = \&_wait;	2023	*wait = \&recv;
1574		2024
1575	=head1 ERROR AND EXCEPTION HANDLING	2025	=head1 ERROR AND EXCEPTION HANDLING
1576		2026
1577	In general, AnyEvent does not do any error handling - it relies on the	2027	In general, AnyEvent does not do any error handling - it relies on the
1578	caller to do that if required. The L<AnyEvent::Strict> module (see also	2028	caller to do that if required. The L<AnyEvent::Strict> module (see also
…		…
1590	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and	2040	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1591	so on.	2041	so on.
1592		2042
1593	=head1 ENVIRONMENT VARIABLES	2043	=head1 ENVIRONMENT VARIABLES
1594		2044
1595	The following environment variables are used by this module or its	2045	AnyEvent supports a number of environment variables that tune the
1596	submodules.	2046	runtime behaviour. They are usually evaluated when AnyEvent is
		2047	loaded, initialised, or a submodule that uses them is loaded. Many of
		2048	them also cause AnyEvent to load additional modules - for example,
		2049	C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
		2050	loaded.
1597		2051
1598	Note that AnyEvent will remove I<all> environment variables starting with	2052	All the environment variables documented here start with
1599	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is	2053	C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1600	enabled.	2054	namespace. Other modules are encouraged (but by no means required) to use
		2055	C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
		2056	namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
		2057	be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
		2058	variables starting with C<AE_>, see below).
		2059
		2060	All variables can also be set via the C<AE_> prefix, that is, instead
		2061	of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
		2062	case there is a clash btween anyevent and another program that uses
		2063	C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
		2064	variable to the empty string, as those variables take precedence.
		2065
		2066	When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
		2067	to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
		2068	exists. If taint mode is on, then AnyEvent will remove I<all> environment
		2069	variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
		2070	with C<undef> or the empty string, if the corresaponding C<AE_> variable
		2071	is set).
		2072
		2073	The exact algorithm is currently:
		2074
		2075	1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
		2076	2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
		2077	3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
		2078
		2079	This ensures that child processes will not see the C<AE_> variables.
		2080
		2081	The following environment variables are currently known to AnyEvent:
1601		2082
1602	=over 4	2083	=over 4
1603		2084
1604	=item C<PERL_ANYEVENT_VERBOSE>	2085	=item C<PERL_ANYEVENT_VERBOSE>
1605		2086
1606	By default, AnyEvent will be completely silent except in fatal	2087	By default, AnyEvent will log messages with loglevel C<4> (C<error>) or
1607	conditions. You can set this environment variable to make AnyEvent more	2088	higher (see L<AnyEvent::Log>). You can set this environment variable to a
1608	talkative.	2089	numerical loglevel to make AnyEvent more (or less) talkative.
1609		2090
		2091	If you want to do more than just set the global logging level
		2092	you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
		2093	complex specifications.
		2094
		2095	When set to C<0> (C<off>), then no messages whatsoever will be logged with
		2096	everything else at defaults.
		2097
1610	When set to C<1> or higher, causes AnyEvent to warn about unexpected	2098	When set to C<5> or higher (C<warn>), AnyEvent warns about unexpected
1611	conditions, such as not being able to load the event model specified by	2099	conditions, such as not being able to load the event model specified by
1612	C<PERL_ANYEVENT_MODEL>.	2100	C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an exception - this
		2101	is the minimum recommended level for use during development.
1613		2102
1614	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	2103	When set to C<7> or higher (info), AnyEvent reports which event model it
1615	model it chooses.	2104	chooses.
1616		2105
1617	When set to C<8> or higher, then AnyEvent will report extra information on	2106	When set to C<8> or higher (debug), then AnyEvent will report extra
1618	which optional modules it loads and how it implements certain features.	2107	information on which optional modules it loads and how it implements
		2108	certain features.
		2109
		2110	=item C<PERL_ANYEVENT_LOG>
		2111
		2112	Accepts rather complex logging specifications. For example, you could log
		2113	all C<debug> messages of some module to stderr, warnings and above to
		2114	stderr, and errors and above to syslog, with:
		2115
		2116	PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
		2117
		2118	For the rather extensive details, see L<AnyEvent::Log>.
		2119
		2120	This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
		2121	so will take effect even before AnyEvent has initialised itself.
		2122
		2123	Note that specifying this environment variable causes the L<AnyEvent::Log>
		2124	module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
		2125	using the latter saves a few hundred kB of memory unless a module
		2126	explicitly needs the extra features of AnyEvent::Log.
1619		2127
1620	=item C<PERL_ANYEVENT_STRICT>	2128	=item C<PERL_ANYEVENT_STRICT>
1621		2129
1622	AnyEvent does not do much argument checking by default, as thorough	2130	AnyEvent does not do much argument checking by default, as thorough
1623	argument checking is very costly. Setting this variable to a true value	2131	argument checking is very costly. Setting this variable to a true value
…		…
1625	check the arguments passed to most method calls. If it finds any problems,	2133	check the arguments passed to most method calls. If it finds any problems,
1626	it will croak.	2134	it will croak.
1627		2135
1628	In other words, enables "strict" mode.	2136	In other words, enables "strict" mode.
1629		2137
1630	Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense>	2138	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>
1631	>>, it is definitely recommended to keep it off in production. Keeping	2139	>>, it is definitely recommended to keep it off in production. Keeping
1632	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs	2140	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1633	can be very useful, however.	2141	can be very useful, however.
1634		2142
		2143	=item C<PERL_ANYEVENT_DEBUG_SHELL>
		2144
		2145	If this env variable is nonempty, then its contents will be interpreted by
		2146	C<AnyEvent::Socket::parse_hostport> and C<AnyEvent::Debug::shell> (after
		2147	replacing every occurance of C<$$> by the process pid). The shell object
		2148	is saved in C<$AnyEvent::Debug::SHELL>.
		2149
		2150	This happens when the first watcher is created.
		2151
		2152	For example, to bind a debug shell on a unix domain socket in
		2153	F<< /tmp/debug<pid>.sock >>, you could use this:
		2154
		2155	PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
		2156	# connect with e.g.: socat readline /tmp/debug123.sock
		2157
		2158	Or to bind to tcp port 4545 on localhost:
		2159
		2160	PERL_ANYEVENT_DEBUG_SHELL=127.0.0.1:4545 perlprog
		2161	# connect with e.g.: telnet localhost 4545
		2162
		2163	Note that creating sockets in F</tmp> or on localhost is very unsafe on
		2164	multiuser systems.
		2165
		2166	=item C<PERL_ANYEVENT_DEBUG_WRAP>
		2167
		2168	Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
		2169	debugging purposes. See C<AnyEvent::Debug::wrap> for details.
		2170
1635	=item C<PERL_ANYEVENT_MODEL>	2171	=item C<PERL_ANYEVENT_MODEL>
1636		2172
1637	This can be used to specify the event model to be used by AnyEvent, before	2173	This can be used to specify the event model to be used by AnyEvent, before
1638	auto detection and -probing kicks in. It must be a string consisting	2174	auto detection and -probing kicks in.
1639	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended	2175
		2176	It normally is a string consisting entirely of ASCII letters (e.g. C<EV>
		2177	or C<IOAsync>). The string C<AnyEvent::Impl::> gets prepended and the
1640	and the resulting module name is loaded and if the load was successful,	2178	resulting module name is loaded and - if the load was successful - used as
1641	used as event model. If it fails to load AnyEvent will proceed with	2179	event model backend. If it fails to load then AnyEvent will proceed with
1642	auto detection and -probing.	2180	auto detection and -probing.
1643		2181
1644	This functionality might change in future versions.	2182	If the string ends with C<::> instead (e.g. C<AnyEvent::Impl::EV::>) then
		2183	nothing gets prepended and the module name is used as-is (hint: C<::> at
		2184	the end of a string designates a module name and quotes it appropriately).
1645		2185
1646	For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you	2186	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1647	could start your program like this:	2187	could start your program like this:
1648		2188
1649	PERL_ANYEVENT_MODEL=Perl perl ...	2189	PERL_ANYEVENT_MODEL=Perl perl ...
		2190
		2191	=item C<PERL_ANYEVENT_IO_MODEL>
		2192
		2193	The current file I/O model - see L<AnyEvent::IO> for more info.
		2194
		2195	At the moment, only C<Perl> (small, pure-perl, synchronous) and
		2196	C<IOAIO> (truly asynchronous) are supported. The default is C<IOAIO> if
		2197	L<AnyEvent::AIO> can be loaded, otherwise it is C<Perl>.
1650		2198
1651	=item C<PERL_ANYEVENT_PROTOCOLS>	2199	=item C<PERL_ANYEVENT_PROTOCOLS>
1652		2200
1653	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences	2201	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
1654	for IPv4 or IPv6. The default is unspecified (and might change, or be the result	2202	for IPv4 or IPv6. The default is unspecified (and might change, or be the result
…		…
1667	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	2215	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1668	- only support IPv4, never try to resolve or contact IPv6	2216	- only support IPv4, never try to resolve or contact IPv6
1669	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	2217	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1670	IPv6, but prefer IPv6 over IPv4.	2218	IPv6, but prefer IPv6 over IPv4.
1671		2219
		2220	=item C<PERL_ANYEVENT_HOSTS>
		2221
		2222	This variable, if specified, overrides the F</etc/hosts> file used by
		2223	L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
		2224	from that file instead.
		2225
1672	=item C<PERL_ANYEVENT_EDNS0>	2226	=item C<PERL_ANYEVENT_EDNS0>
1673		2227
1674	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension	2228	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
1675	for DNS. This extension is generally useful to reduce DNS traffic, but	2229	DNS. This extension is generally useful to reduce DNS traffic, especially
1676	some (broken) firewalls drop such DNS packets, which is why it is off by	2230	when DNSSEC is involved, but some (broken) firewalls drop such DNS
1677	default.	2231	packets, which is why it is off by default.
1678		2232
1679	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce	2233	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
1680	EDNS0 in its DNS requests.	2234	EDNS0 in its DNS requests.
1681		2235
1682	=item C<PERL_ANYEVENT_MAX_FORKS>	2236	=item C<PERL_ANYEVENT_MAX_FORKS>
…		…
1688		2242
1689	The default value for the C<max_outstanding> parameter for the default DNS	2243	The default value for the C<max_outstanding> parameter for the default DNS
1690	resolver - this is the maximum number of parallel DNS requests that are	2244	resolver - this is the maximum number of parallel DNS requests that are
1691	sent to the DNS server.	2245	sent to the DNS server.
1692		2246
		2247	=item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY>
		2248
		2249	Perl has inherently racy signal handling (you can basically choose between
		2250	losing signals and memory corruption) - pure perl event loops (including
		2251	C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore
		2252	have to poll regularly to avoid losing signals.
		2253
		2254	Some event loops are racy, but don't poll regularly, and some event loops
		2255	are written in C but are still racy. For those event loops, AnyEvent
		2256	installs a timer that regularly wakes up the event loop.
		2257
		2258	By default, the interval for this timer is C<10> seconds, but you can
		2259	override this delay with this environment variable (or by setting
		2260	the C<$AnyEvent::MAX_SIGNAL_LATENCY> variable before creating signal
		2261	watchers).
		2262
		2263	Lower values increase CPU (and energy) usage, higher values can introduce
		2264	long delays when reaping children or waiting for signals.
		2265
		2266	The L<AnyEvent::Async> module, if available, will be used to avoid this
		2267	polling (with most event loops).
		2268
1693	=item C<PERL_ANYEVENT_RESOLV_CONF>	2269	=item C<PERL_ANYEVENT_RESOLV_CONF>
1694		2270
1695	The file to use instead of F</etc/resolv.conf> (or OS-specific	2271	The absolute path to a F<resolv.conf>-style file to use instead of
1696	configuration) in the default resolver. When set to the empty string, no	2272	F</etc/resolv.conf> (or the OS-specific configuration) in the default
1697	default config will be used.	2273	resolver, or the empty string to select the default configuration.
1698		2274
1699	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.	2275	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
1700		2276
1701	When neither C<ca_file> nor C<ca_path> was specified during	2277	When neither C<ca_file> nor C<ca_path> was specified during
1702	L<AnyEvent::TLS> context creation, and either of these environment	2278	L<AnyEvent::TLS> context creation, and either of these environment
1703	variables exist, they will be used to specify CA certificate locations	2279	variables are nonempty, they will be used to specify CA certificate
1704	instead of a system-dependent default.	2280	locations instead of a system-dependent default.
1705		2281
1706	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>	2282	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
1707		2283
1708	When these are set to C<1>, then the respective modules are not	2284	When these are set to C<1>, then the respective modules are not
1709	loaded. Mostly good for testing AnyEvent itself.	2285	loaded. Mostly good for testing AnyEvent itself.
…		…
1772	warn "read: $input\n"; # output what has been read	2348	warn "read: $input\n"; # output what has been read
1773	$cv->send if $input =~ /^q/i; # quit program if /^q/i	2349	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1774	},	2350	},
1775	);	2351	);
1776		2352
1777	my $time_watcher; # can only be used once
1778
1779	sub new_timer {
1780	$timer = AnyEvent->timer (after => 1, cb => sub {	2353	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1781	warn "timeout\n"; # print 'timeout' about every second	2354	warn "timeout\n"; # print 'timeout' at most every second
1782	&new_timer; # and restart the time
1783	});	2355	});
1784	}
1785
1786	new_timer; # create first timer
1787		2356
1788	$cv->recv; # wait until user enters /^q/i	2357	$cv->recv; # wait until user enters /^q/i
1789		2358
1790	=head1 REAL-WORLD EXAMPLE	2359	=head1 REAL-WORLD EXAMPLE
1791		2360
…		…
1864		2433
1865	The actual code goes further and collects all errors (C<die>s, exceptions)	2434	The actual code goes further and collects all errors (C<die>s, exceptions)
1866	that occurred during request processing. The C<result> method detects	2435	that occurred during request processing. The C<result> method detects
1867	whether an exception as thrown (it is stored inside the $txn object)	2436	whether an exception as thrown (it is stored inside the $txn object)
1868	and just throws the exception, which means connection errors and other	2437	and just throws the exception, which means connection errors and other
1869	problems get reported tot he code that tries to use the result, not in a	2438	problems get reported to the code that tries to use the result, not in a
1870	random callback.	2439	random callback.
1871		2440
1872	All of this enables the following usage styles:	2441	All of this enables the following usage styles:
1873		2442
1874	1. Blocking:	2443	1. Blocking:
…		…
1922	through AnyEvent. The benchmark creates a lot of timers (with a zero	2491	through AnyEvent. The benchmark creates a lot of timers (with a zero
1923	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2492	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
1924	which it is), lets them fire exactly once and destroys them again.	2493	which it is), lets them fire exactly once and destroys them again.
1925		2494
1926	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2495	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1927	distribution.	2496	distribution. It uses the L<AE> interface, which makes a real difference
		2497	for the EV and Perl backends only.
1928		2498
1929	=head3 Explanation of the columns	2499	=head3 Explanation of the columns
1930		2500
1931	I<watcher> is the number of event watchers created/destroyed. Since	2501	I<watcher> is the number of event watchers created/destroyed. Since
1932	different event models feature vastly different performances, each event	2502	different event models feature vastly different performances, each event
…		…
1953	watcher.	2523	watcher.
1954		2524
1955	=head3 Results	2525	=head3 Results
1956		2526
1957	name watchers bytes create invoke destroy comment	2527	name watchers bytes create invoke destroy comment
1958	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2528	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
1959	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2529	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
1960	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2530	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
1961	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2531	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
1962	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2532	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
1963	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2533	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
1964	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2534	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
1965	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2535	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
1966	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2536	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
1967	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2537	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
1968	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2538	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
1969	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2539	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
1970		2540
1971	=head3 Discussion	2541	=head3 Discussion
1972		2542
1973	The benchmark does I<not> measure scalability of the event loop very	2543	The benchmark does I<not> measure scalability of the event loop very
1974	well. For example, a select-based event loop (such as the pure perl one)	2544	well. For example, a select-based event loop (such as the pure perl one)
…		…
1986	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2556	benchmark machine, handling an event takes roughly 1600 CPU cycles with
1987	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2557	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
1988	cycles with POE.	2558	cycles with POE.
1989		2559
1990	C<EV> is the sole leader regarding speed and memory use, which are both	2560	C<EV> is the sole leader regarding speed and memory use, which are both
1991	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2561	maximal/minimal, respectively. When using the L<AE> API there is zero
		2562	overhead (when going through the AnyEvent API create is about 5-6 times
		2563	slower, with other times being equal, so still uses far less memory than
1992	far less memory than any other event loop and is still faster than Event	2564	any other event loop and is still faster than Event natively).
1993	natively.
1994		2565
1995	The pure perl implementation is hit in a few sweet spots (both the	2566	The pure perl implementation is hit in a few sweet spots (both the
1996	constant timeout and the use of a single fd hit optimisations in the perl	2567	constant timeout and the use of a single fd hit optimisations in the perl
1997	interpreter and the backend itself). Nevertheless this shows that it	2568	interpreter and the backend itself). Nevertheless this shows that it
1998	adds very little overhead in itself. Like any select-based backend its	2569	adds very little overhead in itself. Like any select-based backend its
…		…
2046	(even when used without AnyEvent), but most event loops have acceptable	2617	(even when used without AnyEvent), but most event loops have acceptable
2047	performance with or without AnyEvent.	2618	performance with or without AnyEvent.
2048		2619
2049	=item * The overhead AnyEvent adds is usually much smaller than the overhead of	2620	=item * The overhead AnyEvent adds is usually much smaller than the overhead of
2050	the actual event loop, only with extremely fast event loops such as EV	2621	the actual event loop, only with extremely fast event loops such as EV
2051	adds AnyEvent significant overhead.	2622	does AnyEvent add significant overhead.
2052		2623
2053	=item * You should avoid POE like the plague if you want performance or	2624	=item * You should avoid POE like the plague if you want performance or
2054	reasonable memory usage.	2625	reasonable memory usage.
2055		2626
2056	=back	2627	=back
…		…
2072	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2643	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2073	(1%) are active. This mirrors the activity of large servers with many	2644	(1%) are active. This mirrors the activity of large servers with many
2074	connections, most of which are idle at any one point in time.	2645	connections, most of which are idle at any one point in time.
2075		2646
2076	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2647	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2077	distribution.	2648	distribution. It uses the L<AE> interface, which makes a real difference
		2649	for the EV and Perl backends only.
2078		2650
2079	=head3 Explanation of the columns	2651	=head3 Explanation of the columns
2080		2652
2081	I<sockets> is the number of sockets, and twice the number of "servers" (as	2653	I<sockets> is the number of sockets, and twice the number of "servers" (as
2082	each server has a read and write socket end).	2654	each server has a read and write socket end).
…		…
2090	a new one that moves the timeout into the future.	2662	a new one that moves the timeout into the future.
2091		2663
2092	=head3 Results	2664	=head3 Results
2093		2665
2094	name sockets create request	2666	name sockets create request
2095	EV 20000 69.01 11.16	2667	EV 20000 62.66 7.99
2096	Perl 20000 73.32 35.87	2668	Perl 20000 68.32 32.64
2097	IOAsync 20000 157.00 98.14 epoll	2669	IOAsync 20000 174.06 101.15 epoll
2098	IOAsync 20000 159.31 616.06 poll	2670	IOAsync 20000 174.67 610.84 poll
2099	Event 20000 212.62 257.32	2671	Event 20000 202.69 242.91
2100	Glib 20000 651.16 1896.30	2672	Glib 20000 557.01 1689.52
2101	POE 20000 349.67 12317.24 uses POE::Loop::Event	2673	POE 20000 341.54 12086.32 uses POE::Loop::Event
2102		2674
2103	=head3 Discussion	2675	=head3 Discussion
2104		2676
2105	This benchmark I<does> measure scalability and overall performance of the	2677	This benchmark I<does> measure scalability and overall performance of the
2106	particular event loop.	2678	particular event loop.
…		…
2232	As you can see, the AnyEvent + EV combination even beats the	2804	As you can see, the AnyEvent + EV combination even beats the
2233	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2805	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2234	backend easily beats IO::Lambda and POE.	2806	backend easily beats IO::Lambda and POE.
2235		2807
2236	And even the 100% non-blocking version written using the high-level (and	2808	And even the 100% non-blocking version written using the high-level (and
2237	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2809	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2238	large margin, even though it does all of DNS, tcp-connect and socket I/O	2810	higher level ("unoptimised") abstractions by a large margin, even though
2239	in a non-blocking way.	2811	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2240		2812
2241	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2813	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2242	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2814	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2243	part of the IO::lambda distribution and were used without any changes.	2815	part of the IO::Lambda distribution and were used without any changes.
2244		2816
2245		2817
2246	=head1 SIGNALS	2818	=head1 SIGNALS
2247		2819
2248	AnyEvent currently installs handlers for these signals:	2820	AnyEvent currently installs handlers for these signals:
…		…
2285	unless defined $SIG{PIPE};	2857	unless defined $SIG{PIPE};
2286		2858
2287	=head1 RECOMMENDED/OPTIONAL MODULES	2859	=head1 RECOMMENDED/OPTIONAL MODULES
2288		2860
2289	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and	2861	One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and
2290	it's built-in modules) are required to use it.	2862	its built-in modules) are required to use it.
2291		2863
2292	That does not mean that AnyEvent won't take advantage of some additional	2864	That does not mean that AnyEvent won't take advantage of some additional
2293	modules if they are installed.	2865	modules if they are installed.
2294		2866
2295	This section epxlains which additional modules will be used, and how they	2867	This section explains which additional modules will be used, and how they
2296	affect AnyEvent's operetion.	2868	affect AnyEvent's operation.
2297		2869
2298	=over 4	2870	=over 4
2299		2871
2300	=item L<Async::Interrupt>	2872	=item L<Async::Interrupt>
2301		2873
…		…
2306	catch the signals) with some delay (default is 10 seconds, look for	2878	catch the signals) with some delay (default is 10 seconds, look for
2307	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2879	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2308		2880
2309	If this module is available, then it will be used to implement signal	2881	If this module is available, then it will be used to implement signal
2310	catching, which means that signals will not be delayed, and the event loop	2882	catching, which means that signals will not be delayed, and the event loop
2311	will not be interrupted regularly, which is more efficient (And good for	2883	will not be interrupted regularly, which is more efficient (and good for
2312	battery life on laptops).	2884	battery life on laptops).
2313		2885
2314	This affects not just the pure-perl event loop, but also other event loops	2886	This affects not just the pure-perl event loop, but also other event loops
2315	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2887	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2316		2888
…		…
2328	automatic timer adjustments even when no monotonic clock is available,	2900	automatic timer adjustments even when no monotonic clock is available,
2329	can take avdantage of advanced kernel interfaces such as C<epoll> and	2901	can take avdantage of advanced kernel interfaces such as C<epoll> and
2330	C<kqueue>, and is the fastest backend I<by far>. You can even embed	2902	C<kqueue>, and is the fastest backend I<by far>. You can even embed
2331	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).	2903	L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>).
2332		2904
		2905	If you only use backends that rely on another event loop (e.g. C<Tk>),
		2906	then this module will do nothing for you.
		2907
2333	=item L<Guard>	2908	=item L<Guard>
2334		2909
2335	The guard module, when used, will be used to implement	2910	The guard module, when used, will be used to implement
2336	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a	2911	C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a
2337	lot less memory), but otherwise doesn't affect guard operation much. It is	2912	lot less memory), but otherwise doesn't affect guard operation much. It is
2338	purely used for performance.	2913	purely used for performance.
2339		2914
2340	=item L<JSON> and L<JSON::XS>	2915	=item L<JSON> and L<JSON::XS>
2341		2916
2342	This module is required when you want to read or write JSON data via	2917	One of these modules is required when you want to read or write JSON data
2343	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2918	via L<AnyEvent::Handle>. L<JSON> is also written in pure-perl, but can take
2344	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2919	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2345
2346	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2347	installed.
2348		2920
2349	=item L<Net::SSLeay>	2921	=item L<Net::SSLeay>
2350		2922
2351	Implementing TLS/SSL in Perl is certainly interesting, but not very	2923	Implementing TLS/SSL in Perl is certainly interesting, but not very
2352	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with	2924	worthwhile: If this module is installed, then L<AnyEvent::Handle> (with
2353	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.	2925	the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL.
2354		2926
2355	=item L<Time::HiRes>	2927	=item L<Time::HiRes>
2356		2928
2357	This module is part of perl since release 5.008. It will be used when the	2929	This module is part of perl since release 5.008. It will be used when the
2358	chosen event library does not come with a timing source on it's own. The	2930	chosen event library does not come with a timing source of its own. The
2359	pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to	2931	pure-perl event loop (L<AnyEvent::Loop>) will additionally load it to
2360	try to use a monotonic clock for timing stability.	2932	try to use a monotonic clock for timing stability.
2361		2933
		2934	=item L<AnyEvent::AIO> (and L<IO::AIO>)
		2935
		2936	The default implementation of L<AnyEvent::IO> is to do I/O synchronously,
		2937	stopping programs while they access the disk, which is fine for a lot of
		2938	programs.
		2939
		2940	Installing AnyEvent::AIO (and its IO::AIO dependency) makes it switch to
		2941	a true asynchronous implementation, so event processing can continue even
		2942	while waiting for disk I/O.
		2943
2362	=back	2944	=back
2363		2945
2364		2946
2365	=head1 FORK	2947	=head1 FORK
2366		2948
2367	Most event libraries are not fork-safe. The ones who are usually are	2949	Most event libraries are not fork-safe. The ones who are usually are
2368	because they rely on inefficient but fork-safe C<select> or C<poll>	2950	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2369	calls. Only L<EV> is fully fork-aware.	2951	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2952	are usually badly thought-out hacks that are incompatible with fork in
		2953	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2954	continue event-processing in both parent and child (or both, if you know
		2955	what you are doing).
		2956
		2957	This means that, in general, you cannot fork and do event processing in
		2958	the child if the event library was initialised before the fork (which
		2959	usually happens when the first AnyEvent watcher is created, or the library
		2960	is loaded).
2370		2961
2371	If you have to fork, you must either do so I<before> creating your first	2962	If you have to fork, you must either do so I<before> creating your first
2372	watcher OR you must not use AnyEvent at all in the child OR you must do	2963	watcher OR you must not use AnyEvent at all in the child OR you must do
2373	something completely out of the scope of AnyEvent.	2964	something completely out of the scope of AnyEvent.
		2965
		2966	The problem of doing event processing in the parent I<and> the child
		2967	is much more complicated: even for backends that I<are> fork-aware or
		2968	fork-safe, their behaviour is not usually what you want: fork clones all
		2969	watchers, that means all timers, I/O watchers etc. are active in both
		2970	parent and child, which is almost never what you want. USing C<exec>
		2971	to start worker children from some kind of manage rprocess is usually
		2972	preferred, because it is much easier and cleaner, at the expense of having
		2973	to have another binary.
2374		2974
2375		2975
2376	=head1 SECURITY CONSIDERATIONS	2976	=head1 SECURITY CONSIDERATIONS
2377		2977
2378	AnyEvent can be forced to load any event model via	2978	AnyEvent can be forced to load any event model via
…		…
2408	pronounced).	3008	pronounced).
2409		3009
2410		3010
2411	=head1 SEE ALSO	3011	=head1 SEE ALSO
2412		3012
2413	Utility functions: L<AnyEvent::Util>.	3013	Tutorial/Introduction: L<AnyEvent::Intro>.
2414		3014
2415	Event modules: L<EV>, L<EV::Glib>, L<Glib::EV>, L<Event>, L<Glib::Event>,	3015	FAQ: L<AnyEvent::FAQ>.
2416	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	3016
		3017	Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
		3018	(simply logging).
		3019
		3020	Development/Debugging: L<AnyEvent::Strict> (stricter checking),
		3021	L<AnyEvent::Debug> (interactive shell, watcher tracing).
		3022
		3023	Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
		3024	L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
		3025	L<Qt>, L<POE>, L<FLTK>.
2417		3026
2418	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	3027	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2419	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	3028	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2420	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	3029	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2421	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.	3030	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
		3031	L<AnyEvent::Impl::FLTK>.
2422		3032
2423	Non-blocking file handles, sockets, TCP clients and	3033	Non-blocking handles, pipes, stream sockets, TCP clients and
2424	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	3034	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2425		3035
		3036	Asynchronous File I/O: L<AnyEvent::IO>.
		3037
2426	Asynchronous DNS: L<AnyEvent::DNS>.	3038	Asynchronous DNS: L<AnyEvent::DNS>.
2427		3039
2428	Coroutine support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>,	3040	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.
2429	L<Coro::Event>,
2430		3041
2431	Nontrivial usage examples: L<AnyEvent::GPSD>, L<AnyEvent::XMPP>,	3042	Nontrivial usage examples: L<AnyEvent::GPSD>, L<AnyEvent::IRC>,
2432	L<AnyEvent::HTTP>.	3043	L<AnyEvent::HTTP>.
2433		3044
2434		3045
2435	=head1 AUTHOR	3046	=head1 AUTHOR
2436		3047
2437	Marc Lehmann <schmorp@schmorp.de>	3048	Marc Lehmann <schmorp@schmorp.de>
2438	http://home.schmorp.de/	3049	http://anyevent.schmorp.de
2439		3050
2440	=cut	3051	=cut
2441		3052
2442	1	3053	1
2443		3054

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