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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.356 by root, Fri Aug 12 18:41:25 2011 UTC vs.
Revision 1.408 by root, Thu Dec 6 12:04:23 2012 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - the DBI of event loop programming	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt,
6	and POE are various supported event loops/environments.	6	FLTK and POE are various supported event loops/environments.
7		7
8	=head1 SYNOPSIS	8	=head1 SYNOPSIS
9		9
10	use AnyEvent;	10	use AnyEvent;
11		11
415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's	415	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
416	pure perl implementation).	416	pure perl implementation).
417		417
418	=head3 Safe/Unsafe Signals	418	=head3 Safe/Unsafe Signals
419		419
420	Perl signals can be either "safe" (synchronous to opcode handling) or	420	Perl signals can be either "safe" (synchronous to opcode handling)
421	"unsafe" (asynchronous) - the former might get delayed indefinitely, the	421	or "unsafe" (asynchronous) - the former might delay signal delivery
422	latter might corrupt your memory.	422	indefinitely, the latter might corrupt your memory.
423		423
424	AnyEvent signal handlers are, in addition, synchronous to the event loop,	424	AnyEvent signal handlers are, in addition, synchronous to the event loop,
425	i.e. they will not interrupt your running perl program but will only be	425	i.e. they will not interrupt your running perl program but will only be
426	called as part of the normal event handling (just like timer, I/O etc.	426	called as part of the normal event handling (just like timer, I/O etc.
427	callbacks, too).	427	callbacks, too).
428		428
429	=head3 Signal Races, Delays and Workarounds	429	=head3 Signal Races, Delays and Workarounds
430		430
431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	431	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support
432	callbacks to signals in a generic way, which is a pity, as you cannot	432	attaching callbacks to signals in a generic way, which is a pity,
433	do race-free signal handling in perl, requiring C libraries for	433	as you cannot do race-free signal handling in perl, requiring
434	this. AnyEvent will try to do its best, which means in some cases,	434	C libraries for this. AnyEvent will try to do its best, which
435	signals will be delayed. The maximum time a signal might be delayed is	435	means in some cases, signals will be delayed. The maximum time
436	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This	436	a signal might be delayed is 10 seconds by default, but can
437	variable can be changed only before the first signal watcher is created,	437	be overriden via C<$ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY}> or
438	and should be left alone otherwise. This variable determines how often	438	C<$AnyEvent::MAX_SIGNAL_LATENCY> - see the L<ENVIRONMENT VARIABLES>
439	AnyEvent polls for signals (in case a wake-up was missed). Higher values	439	section for details.
440	will cause fewer spurious wake-ups, which is better for power and CPU
441	saving.
442		440
443	All these problems can be avoided by installing the optional	441	All these problems can be avoided by installing the optional
444	L<Async::Interrupt> module, which works with most event loops. It will not	442	L<Async::Interrupt> module, which works with most event loops. It will not
445	work with inherently broken event loops such as L<Event> or L<Event::Lib>	443	work with inherently broken event loops such as L<Event> or L<Event::Lib>
446	(and not with L<POE> currently, as POE does its own workaround with	444	(and not with L<POE> currently). For those, you just have to suffer the
447	one-second latency). For those, you just have to suffer the delays.	445	delays.
448		446
449	=head2 CHILD PROCESS WATCHERS	447	=head2 CHILD PROCESS WATCHERS
450		448
451	$w = AnyEvent->child (pid => <process id>, cb => <callback>);	449	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
452		450
…		…
765	};	763	};
766	}	764	}
767		765
768	$cv->end;	766	$cv->end;
769		767
		768	...
		769
		770	my $results = $cv->recv;
		771
770	This code fragment supposedly pings a number of hosts and calls	772	This code fragment supposedly pings a number of hosts and calls
771	C<send> after results for all then have have been gathered - in any	773	C<send> after results for all then have have been gathered - in any
772	order. To achieve this, the code issues a call to C<begin> when it starts	774	order. To achieve this, the code issues a call to C<begin> when it starts
773	each ping request and calls C<end> when it has received some result for	775	each ping request and calls C<end> when it has received some result for
774	it. Since C<begin> and C<end> only maintain a counter, the order in which	776	it. Since C<begin> and C<end> only maintain a counter, the order in which
…		…
878	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	880	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879	AnyEvent::Impl::POE based on POE, very slow, some limitations.	881	AnyEvent::Impl::POE based on POE, very slow, some limitations.
880	AnyEvent::Impl::Irssi used when running within irssi.	882	AnyEvent::Impl::Irssi used when running within irssi.
881	AnyEvent::Impl::IOAsync based on IO::Async.	883	AnyEvent::Impl::IOAsync based on IO::Async.
882	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.	884	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883	AnyEvent::Impl::FLTK2 based on FLTK (fltk 2 binding).	885	AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
884		886
885	=item Backends with special needs.	887	=item Backends with special needs.
886		888
887	Qt requires the Qt::Application to be instantiated first, but will	889	Qt requires the Qt::Application to be instantiated first, but will
888	otherwise be picked up automatically. As long as the main program	890	otherwise be picked up automatically. As long as the main program
…		…
933		935
934	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	936	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
935	if necessary. You should only call this function right before you would	937	if necessary. You should only call this function right before you would
936	have created an AnyEvent watcher anyway, that is, as late as possible at	938	have created an AnyEvent watcher anyway, that is, as late as possible at
937	runtime, and not e.g. during initialisation of your module.	939	runtime, and not e.g. during initialisation of your module.
		940
		941	The effect of calling this function is as if a watcher had been created
		942	(specifically, actions that happen "when the first watcher is created"
		943	happen when calling detetc as well).
938		944
939	If you need to do some initialisation before AnyEvent watchers are	945	If you need to do some initialisation before AnyEvent watchers are
940	created, use C<post_detect>.	946	created, use C<post_detect>.
941		947
942	=item $guard = AnyEvent::post_detect { BLOCK }	948	=item $guard = AnyEvent::post_detect { BLOCK }
…		…
1045	It should use C<postpone>:	1051	It should use C<postpone>:
1046		1052
1047	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later	1053	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
1048	if $some_error_condition;	1054	if $some_error_condition;
1049		1055
		1056	=item AnyEvent::log $level, $msg[, @args]
		1057
		1058	Log the given C<$msg> at the given C<$level>.
		1059
		1060	If L<AnyEvent::Log> is not loaded then this function makes a simple test
		1061	to see whether the message will be logged. If the test succeeds it will
		1062	load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
		1063	the L<AnyEvent::Log> documentation for details.
		1064
		1065	If the test fails it will simply return. Right now this happens when a
		1066	numerical loglevel is used and it is larger than the level specified via
		1067	C<$ENV{PERL_ANYEVENT_VERBOSE}>.
		1068
		1069	If you want to sprinkle loads of logging calls around your code, consider
		1070	creating a logger callback with the C<AnyEvent::Log::logger> function,
		1071	which can reduce typing, codesize and can reduce the logging overhead
		1072	enourmously.
		1073
1050	=back	1074	=back
1051		1075
1052	=head1 WHAT TO DO IN A MODULE	1076	=head1 WHAT TO DO IN A MODULE
1053		1077
1054	As a module author, you should C<use AnyEvent> and call AnyEvent methods	1078	As a module author, you should C<use AnyEvent> and call AnyEvent methods
…		…
1110		1134
1111		1135
1112	=head1 OTHER MODULES	1136	=head1 OTHER MODULES
1113		1137
1114	The following is a non-exhaustive list of additional modules that use	1138	The following is a non-exhaustive list of additional modules that use
1115	AnyEvent as a client and can therefore be mixed easily with other AnyEvent	1139	AnyEvent as a client and can therefore be mixed easily with other
1116	modules and other event loops in the same program. Some of the modules	1140	AnyEvent modules and other event loops in the same program. Some of the
1117	come as part of AnyEvent, the others are available via CPAN.	1141	modules come as part of AnyEvent, the others are available via CPAN (see
		1142	L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
		1143	a longer non-exhaustive list), and the list is heavily biased towards
		1144	modules of the AnyEvent author himself :)
1118		1145
1119	=over 4	1146	=over 4
1120		1147
1121	=item L<AnyEvent::Util>	1148	=item L<AnyEvent::Util>
1122		1149
…		…
1142	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>	1169	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1143		1170
1144	Implement event-based interfaces to the protocols of the same name (for	1171	Implement event-based interfaces to the protocols of the same name (for
1145	the curious, IGS is the International Go Server and FCP is the Freenet	1172	the curious, IGS is the International Go Server and FCP is the Freenet
1146	Client Protocol).	1173	Client Protocol).
1147
1148	=item L<AnyEvent::Handle::UDP>
1149
1150	Here be danger!
1151
1152	As Pauli would put it, "Not only is it not right, it's not even wrong!" -
1153	there are so many things wrong with AnyEvent::Handle::UDP, most notably
1154	its use of a stream-based API with a protocol that isn't streamable, that
1155	the only way to improve it is to delete it.
1156
1157	It features data corruption (but typically only under load) and general
1158	confusion. On top, the author is not only clueless about UDP but also
1159	fact-resistant - some gems of his understanding: "connect doesn't work
1160	with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not
1161	packets", "I don't need to implement proper error checking as UDP doesn't
1162	support error checking" and so on - he doesn't even understand what's
1163	wrong with his module when it is explained to him.
1164
1165	=item L<AnyEvent::DBI>
1166
1167	Executes L<DBI> requests asynchronously in a proxy process for you,
1168	notifying you in an event-based way when the operation is finished.
1169		1174
1170	=item L<AnyEvent::AIO>	1175	=item L<AnyEvent::AIO>
1171		1176
1172	Truly asynchronous (as opposed to non-blocking) I/O, should be in the	1177	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1173	toolbox of every event programmer. AnyEvent::AIO transparently fuses	1178	toolbox of every event programmer. AnyEvent::AIO transparently fuses
1174	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based	1179	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1175	file I/O, and much more.	1180	file I/O, and much more.
1176		1181
		1182	=item L<AnyEvent::Filesys::Notify>
		1183
		1184	AnyEvent is good for non-blocking stuff, but it can't detect file or
		1185	path changes (e.g. "watch this directory for new files", "watch this
		1186	file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
		1187	do just that in a portbale fashion, supporting inotify on GNU/Linux and
		1188	some weird, without doubt broken, stuff on OS X to monitor files. It can
		1189	fall back to blocking scans at regular intervals transparently on other
		1190	platforms, so it's about as portable as it gets.
		1191
		1192	(I haven't used it myself, but I haven't heard anybody complaining about
		1193	it yet).
		1194
		1195	=item L<AnyEvent::DBI>
		1196
		1197	Executes L<DBI> requests asynchronously in a proxy process for you,
		1198	notifying you in an event-based way when the operation is finished.
		1199
1177	=item L<AnyEvent::HTTPD>	1200	=item L<AnyEvent::HTTPD>
1178		1201
1179	A simple embedded webserver.	1202	A simple embedded webserver.
1180		1203
1181	=item L<AnyEvent::FastPing>	1204	=item L<AnyEvent::FastPing>
1182		1205
1183	The fastest ping in the west.	1206	The fastest ping in the west.
1184		1207
1185	=item L<Coro>	1208	=item L<Coro>
1186		1209
1187	Has special support for AnyEvent via L<Coro::AnyEvent>.	1210	Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
		1211	to simply invert the flow control - don't call us, we will call you:
		1212
		1213	async {
		1214	Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
		1215	print "5 seconds later!\n";
		1216
		1217	Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
		1218	my $line = <STDIN>; # works for ttys
		1219
		1220	AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
		1221	my ($body, $hdr) = Coro::rouse_wait;
		1222	};
1188		1223
1189	=back	1224	=back
1190		1225
1191	=cut	1226	=cut
1192		1227
1193	package AnyEvent;	1228	package AnyEvent;
1194		1229
1195	# basically a tuned-down version of common::sense	1230	# basically a tuned-down version of common::sense
1196	sub common_sense {	1231	sub common_sense {
1197	# from common:.sense 3.4	1232	# from common:.sense 3.5
		1233	local $^W;
1198	${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf0\x0f\xc0\xf0\xfc\x33\x00";	1234	${^WARNING_BITS} ^= ${^WARNING_BITS} ^ "\x3c\x3f\x33\x00\x0f\xf0\x0f\xc0\xf0\xfc\x33\x00";
1199	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)	1235	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1200	$^H \|= 0x00000600;	1236	$^H \|= 0x00000600;
1201	}	1237	}
1202		1238
1203	BEGIN { AnyEvent::common_sense }	1239	BEGIN { AnyEvent::common_sense }
1204		1240
1205	use Carp ();	1241	use Carp ();
1206		1242
1207	our $VERSION = '5.34';	1243	our $VERSION = '7.04';
1208	our $MODEL;	1244	our $MODEL;
1209
1210	our $AUTOLOAD;
1211	our @ISA;	1245	our @ISA;
1212
1213	our @REGISTRY;	1246	our @REGISTRY;
1214
1215	our $VERBOSE;	1247	our $VERBOSE;
		1248	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
		1249	our $MAX_SIGNAL_LATENCY = $ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY} \|\| 10; # executes after the BEGIN block below (tainting!)
1216		1250
1217	BEGIN {	1251	BEGIN {
1218	require "AnyEvent/constants.pl";	1252	require "AnyEvent/constants.pl";
1219		1253
1220	eval "sub TAINT (){" . (${^TAINT}*1) . "}";	1254	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1221		1255
1222	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1256	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1223	if ${^TAINT};	1257	if ${^TAINT};
1224		1258
1225	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1259	$ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
		1260	for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1226		1261
1227	}	1262	@ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
		1263	if ${^TAINT};
1228		1264
1229	our $MAX_SIGNAL_LATENCY = 10;	1265	# $ENV{PERL_ANYEVENT_xxx} now valid
1230		1266
1231	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1267	$VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 4;
1232		1268
1233	{
1234	my $idx;	1269	my $idx;
1235	$PROTOCOL{$_} = ++$idx	1270	$PROTOCOL{$_} = ++$idx
1236	for reverse split /\s,\s/,	1271	for reverse split /\s,\s/,
1237	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1272	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1238	}	1273	}
…		…
1269	$POSTPONE_W \|\|= AE::timer (0, 0, \&_postpone_exec);	1304	$POSTPONE_W \|\|= AE::timer (0, 0, \&_postpone_exec);
1270		1305
1271	()	1306	()
1272	}	1307	}
1273		1308
		1309	sub log($$;@) {
		1310	# only load the big bloated module when we actually are about to log something
		1311	if ($_[0] <= ($VERBOSE \|\| 1)) { # also catches non-numeric levels(!) and fatal
		1312	local ($!, $@);
		1313	require AnyEvent::Log; # among other things, sets $VERBOSE to 9
		1314	# AnyEvent::Log overwrites this function
		1315	goto &log;
		1316	}
		1317
		1318	0 # not logged
		1319	}
		1320
		1321	sub _logger($;$) {
		1322	my ($level, $renabled) = @_;
		1323
		1324	$$renabled = $level <= $VERBOSE;
		1325
		1326	my $logger = [(caller)[0], $level, $renabled];
		1327
		1328	$AnyEvent::Log::LOGGER{$logger+0} = $logger;
		1329
		1330	# return unless defined wantarray;
		1331	#
		1332	# require AnyEvent::Util;
		1333	# my $guard = AnyEvent::Util::guard (sub {
		1334	# # "clean up"
		1335	# delete $LOGGER{$logger+0};
		1336	# });
		1337	#
		1338	# sub {
		1339	# return 0 unless $$renabled;
		1340	#
		1341	# $guard if 0; # keep guard alive, but don't cause runtime overhead
		1342	# require AnyEvent::Log unless $AnyEvent::Log::VERSION;
		1343	# package AnyEvent::Log;
		1344	# _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time
		1345	# }
		1346	}
		1347
		1348	if (length $ENV{PERL_ANYEVENT_LOG}) {
		1349	require AnyEvent::Log; # AnyEvent::Log does the thing for us
		1350	}
		1351
1274	our @models = (	1352	our @models = (
1275	[EV:: => AnyEvent::Impl::EV:: , 1],	1353	[EV:: => AnyEvent::Impl::EV::],
1276	[AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],	1354	[AnyEvent::Loop:: => AnyEvent::Impl::Perl::],
1277	# everything below here will not (normally) be autoprobed	1355	# everything below here will not (normally) be autoprobed
1278	# as the pure perl backend should work everywhere	1356	# as the pure perl backend should work everywhere
1279	# and is usually faster	1357	# and is usually faster
		1358	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package, so msut be near the top
1280	[Event:: => AnyEvent::Impl::Event::, 1],	1359	[Event:: => AnyEvent::Impl::Event::], # slow, stable
1281	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1360	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
		1361	# everything below here should not be autoloaded
1282	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1362	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1283	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1284	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1363	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1285	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1364	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1286	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1365	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1287	[Wx:: => AnyEvent::Impl::POE::],	1366	[Wx:: => AnyEvent::Impl::POE::],
1288	[Prima:: => AnyEvent::Impl::POE::],	1367	[Prima:: => AnyEvent::Impl::POE::],
1289	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect	1368	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1290	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],	1369	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1291	[FLTK:: => AnyEvent::Impl::FLTK2::],	1370	[FLTK:: => AnyEvent::Impl::FLTK::],
1292	);	1371	);
1293		1372
		1373	our @isa_hook;
		1374
		1375	sub _isa_set {
		1376	my @pkg = ("AnyEvent", (map $_->[0], grep defined, @isa_hook), $MODEL);
		1377
		1378	@{"$pkg[$_-1]::ISA"} = $pkg[$_]
		1379	for 1 .. $#pkg;
		1380
		1381	grep $_ && $_->[1], @isa_hook
		1382	and AE::_reset ();
		1383	}
		1384
		1385	# used for hooking AnyEvent::Strict and AnyEvent::Debug::Wrap into the class hierarchy
		1386	sub _isa_hook($$;$) {
		1387	my ($i, $pkg, $reset_ae) = @_;
		1388
		1389	$isa_hook[$i] = $pkg ? [$pkg, $reset_ae] : undef;
		1390
		1391	_isa_set;
		1392	}
		1393
		1394	# all autoloaded methods reserve the complete glob, not just the method slot.
		1395	# due to bugs in perls method cache implementation.
		1396	our @methods = qw(io timer time now now_update signal child idle condvar);
		1397
1294	sub detect() {	1398	sub detect() {
		1399	return $MODEL if $MODEL; # some programs keep references to detect
		1400
		1401	# IO::Async::Loop::AnyEvent is extremely evil, refuse to work with it
		1402	# the author knows about the problems and what it does to AnyEvent as a whole
		1403	# (and the ability of others to use AnyEvent), but simply wants to abuse AnyEvent
		1404	# anyway.
		1405	AnyEvent::log fatal => "IO::Async::Loop::AnyEvent detected - that module is broken by\n"
		1406	. "design, abuses internals and breaks AnyEvent - will not continue."
		1407	if exists $INC{"IO/Async/Loop/AnyEvent.pm"};
		1408
		1409	local $!; # for good measure
		1410	local $SIG{__DIE__}; # we use eval
		1411
1295	# free some memory	1412	# free some memory
1296	*detect = sub () { $MODEL };	1413	*detect = sub () { $MODEL };
1297		1414	# undef &func doesn't correctly update the method cache. grmbl.
1298	local $!; # for good measure	1415	# so we delete the whole glob. grmbl.
1299	local $SIG{__DIE__};	1416	# otoh, perl doesn't let me undef an active usb, but it lets me free
		1417	# a glob with an active sub. hrm. i hope it works, but perl is
		1418	# usually buggy in this department. sigh.
		1419	delete @{"AnyEvent::"}{@methods};
		1420	undef @methods;
1300		1421
1301	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {	1422	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1302	my $model = $1;	1423	my $model = $1;
1303	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;	1424	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1304	if (eval "require $model") {	1425	if (eval "require $model") {
		1426	AnyEvent::log 7 => "Loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1305	$MODEL = $model;	1427	$MODEL = $model;
1306	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1307	} else {	1428	} else {
1308	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1429	AnyEvent::log 4 => "Unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1309	}	1430	}
1310	}	1431	}
1311		1432
1312	# check for already loaded models	1433	# check for already loaded models
1313	unless ($MODEL) {	1434	unless ($MODEL) {
1314	for (@REGISTRY, @models) {	1435	for (@REGISTRY, @models) {
1315	my ($package, $model) = @$_;	1436	my ($package, $model) = @$_;
1316	if (${"$package\::VERSION"} > 0) {	1437	if (${"$package\::VERSION"} > 0) {
1317	if (eval "require $model") {	1438	if (eval "require $model") {
		1439	AnyEvent::log 7 => "Autodetected model '$model', using it.";
1318	$MODEL = $model;	1440	$MODEL = $model;
1319	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1441	last;
		1442	} else {
		1443	AnyEvent::log 8 => "Detected event loop $package, but cannot load '$model', skipping: $@";
		1444	}
		1445	}
		1446	}
		1447
		1448	unless ($MODEL) {
		1449	# try to autoload a model
		1450	for (@REGISTRY, @models) {
		1451	my ($package, $model) = @$_;
		1452	if (
		1453	eval "require $package"
		1454	and ${"$package\::VERSION"} > 0
		1455	and eval "require $model"
		1456	) {
		1457	AnyEvent::log 7 => "Autoloaded model '$model', using it.";
		1458	$MODEL = $model;
1320	last;	1459	last;
1321	}	1460	}
1322	}	1461	}
1323	}
1324
1325	unless ($MODEL) {
1326	# try to autoload a model
1327	for (@REGISTRY, @models) {
1328	my ($package, $model, $autoload) = @$_;
1329	if (
1330	$autoload
1331	and eval "require $package"
1332	and ${"$package\::VERSION"} > 0
1333	and eval "require $model"
1334	) {
1335	$MODEL = $model;
1336	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1337	last;
1338	}
1339	}
1340		1462
1341	$MODEL	1463	$MODEL
1342	or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n";	1464	or AnyEvent::log fatal => "Backend autodetection failed - did you properly install AnyEvent?";
1343	}	1465	}
1344	}	1466	}
1345		1467
1346	# free memory only needed for probing	1468	# free memory only needed for probing
1347	undef @models;	1469	undef @models;
1348	undef @REGISTRY;	1470	undef @REGISTRY;
1349		1471
1350	push @{"$MODEL\::ISA"}, "AnyEvent::Base";	1472	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1351	unshift @ISA, $MODEL;
1352		1473
1353	# now nuke some methods that are overridden by the backend.	1474	# now nuke some methods that are overridden by the backend.
1354	# SUPER usage is not allowed in these.	1475	# SUPER usage is not allowed in these.
1355	for (qw(time signal child idle)) {	1476	for (qw(time signal child idle)) {
1356	undef &{"AnyEvent::Base::$_"}	1477	undef &{"AnyEvent::Base::$_"}
1357	if defined &{"$MODEL\::$_"};	1478	if defined &{"$MODEL\::$_"};
1358	}	1479	}
1359		1480
		1481	_isa_set;
		1482
		1483	# we're officially open!
		1484
1360	if ($ENV{PERL_ANYEVENT_STRICT}) {	1485	if ($ENV{PERL_ANYEVENT_STRICT}) {
1361	eval { require AnyEvent::Strict };	1486	require AnyEvent::Strict;
1362	warn "AnyEvent: cannot load AnyEvent::Strict: $@"
1363	if $@ && $VERBOSE;
1364	}	1487	}
		1488
		1489	if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
		1490	require AnyEvent::Debug;
		1491	AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
		1492	}
		1493
		1494	if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
		1495	require AnyEvent::Socket;
		1496	require AnyEvent::Debug;
		1497
		1498	my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
		1499	$shell =~ s/\$\$/$$/g;
		1500
		1501	my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
		1502	$AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
		1503	}
		1504
		1505	# now the anyevent environment is set up as the user told us to, so
		1506	# call the actual user code - post detects
1365		1507
1366	(shift @post_detect)->() while @post_detect;	1508	(shift @post_detect)->() while @post_detect;
1367	undef @post_detect;	1509	undef @post_detect;
1368		1510
1369	*post_detect = sub(&) {	1511	*post_detect = sub(&) {
1370	shift->();	1512	shift->();
1371		1513
1372	undef	1514	undef
1373	};	1515	};
1374		1516
1375	# recover a few more bytes	1517	$MODEL
1376	postpone {	1518	}
1377	undef &AUTOLOAD;	1519
		1520	for my $name (@methods) {
		1521	*$name = sub {
		1522	detect;
		1523	# we use goto because
		1524	# a) it makes the thunk more transparent
		1525	# b) it allows us to delete the thunk later
		1526	goto &{ UNIVERSAL::can AnyEvent => "SUPER::$name" }
1378	};	1527	};
1379
1380	$MODEL
1381	}
1382
1383	our %method = map +($_ => 1),
1384	qw(io timer time now now_update signal child idle condvar DESTROY);
1385
1386	sub AUTOLOAD {
1387	(my $func = $AUTOLOAD) =~ s/.*://;
1388
1389	$method{$func}
1390	or Carp::croak "$func: not a valid AnyEvent class method";
1391
1392	# free some memory
1393	undef %method;
1394
1395	detect;
1396
1397	my $class = shift;
1398	$class->$func (@_);
1399	}	1528	}
1400		1529
1401	# utility function to dup a filehandle. this is used by many backends	1530	# utility function to dup a filehandle. this is used by many backends
1402	# to support binding more than one watcher per filehandle (they usually	1531	# to support binding more than one watcher per filehandle (they usually
1403	# allow only one watcher per fd, so we dup it to get a different one).	1532	# allow only one watcher per fd, so we dup it to get a different one).
…		…
1427		1556
1428	package AE;	1557	package AE;
1429		1558
1430	our $VERSION = $AnyEvent::VERSION;	1559	our $VERSION = $AnyEvent::VERSION;
1431		1560
1432
1433	sub _reset() {	1561	sub _reset() {
1434	eval q{	1562	eval q{
1435	# fall back to the main API by default - backends and AnyEvent::Base	1563	# fall back to the main API by default - backends and AnyEvent::Base
1436	# implementations can overwrite these.	1564	# implementations can overwrite these.
1437		1565
…		…
1450	sub child($$) {	1578	sub child($$) {
1451	AnyEvent->child (pid => $_[0], cb => $_[1])	1579	AnyEvent->child (pid => $_[0], cb => $_[1])
1452	}	1580	}
1453		1581
1454	sub idle($) {	1582	sub idle($) {
1455	AnyEvent->idle (cb => $_[0])	1583	AnyEvent->idle (cb => $_[0]);
1456	}	1584	}
1457		1585
1458	sub cv(;&) {	1586	sub cv(;&) {
1459	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())	1587	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1460	}	1588	}
…		…
1470	sub time() {	1598	sub time() {
1471	AnyEvent->time	1599	AnyEvent->time
1472	}	1600	}
1473		1601
1474	*postpone = \&AnyEvent::postpone;	1602	*postpone = \&AnyEvent::postpone;
		1603	*log = \&AnyEvent::log;
1475	};	1604	};
1476	die if $@;	1605	die if $@;
1477	}	1606	}
1478		1607
1479	BEGIN { _reset }	1608	BEGIN { _reset }
…		…
1484		1613
1485	sub time {	1614	sub time {
1486	eval q{ # poor man's autoloading {}	1615	eval q{ # poor man's autoloading {}
1487	# probe for availability of Time::HiRes	1616	# probe for availability of Time::HiRes
1488	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1617	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1489	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1618	*time = sub { Time::HiRes::time () };
1490	*AE::time = \&Time::HiRes::time;	1619	*AE::time = \& Time::HiRes::time ;
		1620	*now = \&time;
		1621	AnyEvent::log 8 => "using Time::HiRes for sub-second timing accuracy.";
1491	# if (eval "use POSIX (); (POSIX::times())...	1622	# if (eval "use POSIX (); (POSIX::times())...
1492	} else {	1623	} else {
1493	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1624	*time = sub { CORE::time };
1494	*AE::time = sub (){ time }; # epic fail	1625	*AE::time = sub (){ CORE::time };
		1626	*now = \&time;
		1627	AnyEvent::log 3 => "Using built-in time(), no sub-second resolution!";
1495	}	1628	}
1496
1497	*time = sub { AE::time }; # different prototypes
1498	};	1629	};
1499	die if $@;	1630	die if $@;
1500		1631
1501	&time	1632	&time
1502	}	1633	}
1503		1634
1504	*now = \&time;	1635	*now = \&time;
1505
1506	sub now_update { }	1636	sub now_update { }
1507		1637
1508	sub _poll {	1638	sub _poll {
1509	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";	1639	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
1510	}	1640	}
…		…
1596		1726
1597	sub signal {	1727	sub signal {
1598	eval q{ # poor man's autoloading {}	1728	eval q{ # poor man's autoloading {}
1599	# probe for availability of Async::Interrupt	1729	# probe for availability of Async::Interrupt
1600	if (_have_async_interrupt) {	1730	if (_have_async_interrupt) {
1601	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1731	AnyEvent::log 8 => "Using Async::Interrupt for race-free signal handling.";
1602		1732
1603	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1733	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1604	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;	1734	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1605		1735
1606	} else {	1736	} else {
1607	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1737	AnyEvent::log 8 => "Using emulated perl signal handling with latency timer.";
1608		1738
1609	if (AnyEvent::WIN32) {	1739	if (AnyEvent::WIN32) {
1610	require AnyEvent::Util;	1740	require AnyEvent::Util;
1611		1741
1612	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1742	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
…		…
1906	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and	2036	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1907	so on.	2037	so on.
1908		2038
1909	=head1 ENVIRONMENT VARIABLES	2039	=head1 ENVIRONMENT VARIABLES
1910		2040
1911	The following environment variables are used by this module or its	2041	AnyEvent supports a number of environment variables that tune the
1912	submodules.	2042	runtime behaviour. They are usually evaluated when AnyEvent is
		2043	loaded, initialised, or a submodule that uses them is loaded. Many of
		2044	them also cause AnyEvent to load additional modules - for example,
		2045	C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
		2046	loaded.
1913		2047
1914	Note that AnyEvent will remove I<all> environment variables starting with	2048	All the environment variables documented here start with
1915	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is	2049	C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1916	enabled.	2050	namespace. Other modules are encouraged (but by no means required) to use
		2051	C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
		2052	namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
		2053	be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
		2054	variables starting with C<AE_>, see below).
		2055
		2056	All variables can also be set via the C<AE_> prefix, that is, instead
		2057	of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
		2058	case there is a clash btween anyevent and another program that uses
		2059	C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
		2060	variable to the empty string, as those variables take precedence.
		2061
		2062	When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
		2063	to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
		2064	exists. If taint mode is on, then AnyEvent will remove I<all> environment
		2065	variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
		2066	with C<undef> or the empty string, if the corresaponding C<AE_> variable
		2067	is set).
		2068
		2069	The exact algorithm is currently:
		2070
		2071	1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
		2072	2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
		2073	3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
		2074
		2075	This ensures that child processes will not see the C<AE_> variables.
		2076
		2077	The following environment variables are currently known to AnyEvent:
1917		2078
1918	=over 4	2079	=over 4
1919		2080
1920	=item C<PERL_ANYEVENT_VERBOSE>	2081	=item C<PERL_ANYEVENT_VERBOSE>
1921		2082
1922	By default, AnyEvent will be completely silent except in fatal	2083	By default, AnyEvent will log messages with loglevel C<4> (C<error>) or
1923	conditions. You can set this environment variable to make AnyEvent more	2084	higher (see L<AnyEvent::Log>). You can set this environment variable to a
1924	talkative.	2085	numerical loglevel to make AnyEvent more (or less) talkative.
1925		2086
		2087	If you want to do more than just set the global logging level
		2088	you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
		2089	complex specifications.
		2090
		2091	When set to C<0> (C<off>), then no messages whatsoever will be logged with
		2092	everything else at defaults.
		2093
1926	When set to C<1> or higher, causes AnyEvent to warn about unexpected	2094	When set to C<5> or higher (C<warn>), AnyEvent warns about unexpected
1927	conditions, such as not being able to load the event model specified by	2095	conditions, such as not being able to load the event model specified by
1928	C<PERL_ANYEVENT_MODEL>.	2096	C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an exception - this
		2097	is the minimum recommended level for use during development.
1929		2098
1930	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	2099	When set to C<7> or higher (info), AnyEvent reports which event model it
1931	model it chooses.	2100	chooses.
1932		2101
1933	When set to C<8> or higher, then AnyEvent will report extra information on	2102	When set to C<8> or higher (debug), then AnyEvent will report extra
1934	which optional modules it loads and how it implements certain features.	2103	information on which optional modules it loads and how it implements
		2104	certain features.
		2105
		2106	=item C<PERL_ANYEVENT_LOG>
		2107
		2108	Accepts rather complex logging specifications. For example, you could log
		2109	all C<debug> messages of some module to stderr, warnings and above to
		2110	stderr, and errors and above to syslog, with:
		2111
		2112	PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
		2113
		2114	For the rather extensive details, see L<AnyEvent::Log>.
		2115
		2116	This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
		2117	so will take effect even before AnyEvent has initialised itself.
		2118
		2119	Note that specifying this environment variable causes the L<AnyEvent::Log>
		2120	module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
		2121	using the latter saves a few hundred kB of memory unless a module
		2122	explicitly needs the extra features of AnyEvent::Log.
1935		2123
1936	=item C<PERL_ANYEVENT_STRICT>	2124	=item C<PERL_ANYEVENT_STRICT>
1937		2125
1938	AnyEvent does not do much argument checking by default, as thorough	2126	AnyEvent does not do much argument checking by default, as thorough
1939	argument checking is very costly. Setting this variable to a true value	2127	argument checking is very costly. Setting this variable to a true value
…		…
1946	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>	2134	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>
1947	>>, it is definitely recommended to keep it off in production. Keeping	2135	>>, it is definitely recommended to keep it off in production. Keeping
1948	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs	2136	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1949	can be very useful, however.	2137	can be very useful, however.
1950		2138
		2139	=item C<PERL_ANYEVENT_DEBUG_SHELL>
		2140
		2141	If this env variable is nonempty, then its contents will be interpreted by
		2142	C<AnyEvent::Socket::parse_hostport> and C<AnyEvent::Debug::shell> (after
		2143	replacing every occurance of C<$$> by the process pid). The shell object
		2144	is saved in C<$AnyEvent::Debug::SHELL>.
		2145
		2146	This happens when the first watcher is created.
		2147
		2148	For example, to bind a debug shell on a unix domain socket in
		2149	F<< /tmp/debug<pid>.sock >>, you could use this:
		2150
		2151	PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
		2152	# connect with e.g.: socat readline /tmp/debug123.sock
		2153
		2154	Or to bind to tcp port 4545 on localhost:
		2155
		2156	PERL_ANYEVENT_DEBUG_SHELL=127.0.0.1:4545 perlprog
		2157	# connect with e.g.: telnet localhost 4545
		2158
		2159	Note that creating sockets in F</tmp> or on localhost is very unsafe on
		2160	multiuser systems.
		2161
		2162	=item C<PERL_ANYEVENT_DEBUG_WRAP>
		2163
		2164	Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
		2165	debugging purposes. See C<AnyEvent::Debug::wrap> for details.
		2166
1951	=item C<PERL_ANYEVENT_MODEL>	2167	=item C<PERL_ANYEVENT_MODEL>
1952		2168
1953	This can be used to specify the event model to be used by AnyEvent, before	2169	This can be used to specify the event model to be used by AnyEvent, before
1954	auto detection and -probing kicks in.	2170	auto detection and -probing kicks in.
1955		2171
…		…
1966	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you	2182	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1967	could start your program like this:	2183	could start your program like this:
1968		2184
1969	PERL_ANYEVENT_MODEL=Perl perl ...	2185	PERL_ANYEVENT_MODEL=Perl perl ...
1970		2186
		2187	=item C<PERL_ANYEVENT_IO_MODEL>
		2188
		2189	The current file I/O model - see L<AnyEvent::IO> for more info.
		2190
		2191	At the moment, only C<Perl> (small, pure-perl, synchronous) and
		2192	C<IOAIO> (truly asynchronous) are supported. The default is C<IOAIO> if
		2193	L<AnyEvent::AIO> can be loaded, otherwise it is C<Perl>.
		2194
1971	=item C<PERL_ANYEVENT_PROTOCOLS>	2195	=item C<PERL_ANYEVENT_PROTOCOLS>
1972		2196
1973	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences	2197	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
1974	for IPv4 or IPv6. The default is unspecified (and might change, or be the result	2198	for IPv4 or IPv6. The default is unspecified (and might change, or be the result
1975	of auto probing).	2199	of auto probing).
…		…
1987	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	2211	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1988	- only support IPv4, never try to resolve or contact IPv6	2212	- only support IPv4, never try to resolve or contact IPv6
1989	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	2213	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1990	IPv6, but prefer IPv6 over IPv4.	2214	IPv6, but prefer IPv6 over IPv4.
1991		2215
		2216	=item C<PERL_ANYEVENT_HOSTS>
		2217
		2218	This variable, if specified, overrides the F</etc/hosts> file used by
		2219	L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
		2220	from that file instead.
		2221
1992	=item C<PERL_ANYEVENT_EDNS0>	2222	=item C<PERL_ANYEVENT_EDNS0>
1993		2223
1994	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension	2224	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
1995	for DNS. This extension is generally useful to reduce DNS traffic, but	2225	DNS. This extension is generally useful to reduce DNS traffic, especially
1996	some (broken) firewalls drop such DNS packets, which is why it is off by	2226	when DNSSEC is involved, but some (broken) firewalls drop such DNS
1997	default.	2227	packets, which is why it is off by default.
1998		2228
1999	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce	2229	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
2000	EDNS0 in its DNS requests.	2230	EDNS0 in its DNS requests.
2001		2231
2002	=item C<PERL_ANYEVENT_MAX_FORKS>	2232	=item C<PERL_ANYEVENT_MAX_FORKS>
…		…
2008		2238
2009	The default value for the C<max_outstanding> parameter for the default DNS	2239	The default value for the C<max_outstanding> parameter for the default DNS
2010	resolver - this is the maximum number of parallel DNS requests that are	2240	resolver - this is the maximum number of parallel DNS requests that are
2011	sent to the DNS server.	2241	sent to the DNS server.
2012		2242
		2243	=item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY>
		2244
		2245	Perl has inherently racy signal handling (you can basically choose between
		2246	losing signals and memory corruption) - pure perl event loops (including
		2247	C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore
		2248	have to poll regularly to avoid losing signals.
		2249
		2250	Some event loops are racy, but don't poll regularly, and some event loops
		2251	are written in C but are still racy. For those event loops, AnyEvent
		2252	installs a timer that regularly wakes up the event loop.
		2253
		2254	By default, the interval for this timer is C<10> seconds, but you can
		2255	override this delay with this environment variable (or by setting
		2256	the C<$AnyEvent::MAX_SIGNAL_LATENCY> variable before creating signal
		2257	watchers).
		2258
		2259	Lower values increase CPU (and energy) usage, higher values can introduce
		2260	long delays when reaping children or waiting for signals.
		2261
		2262	The L<AnyEvent::Async> module, if available, will be used to avoid this
		2263	polling (with most event loops).
		2264
2013	=item C<PERL_ANYEVENT_RESOLV_CONF>	2265	=item C<PERL_ANYEVENT_RESOLV_CONF>
2014		2266
2015	The file to use instead of F</etc/resolv.conf> (or OS-specific	2267	The absolute path to a F<resolv.conf>-style file to use instead of
2016	configuration) in the default resolver. When set to the empty string, no	2268	F</etc/resolv.conf> (or the OS-specific configuration) in the default
2017	default config will be used.	2269	resolver, or the empty string to select the default configuration.
2018		2270
2019	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.	2271	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
2020		2272
2021	When neither C<ca_file> nor C<ca_path> was specified during	2273	When neither C<ca_file> nor C<ca_path> was specified during
2022	L<AnyEvent::TLS> context creation, and either of these environment	2274	L<AnyEvent::TLS> context creation, and either of these environment
2023	variables exist, they will be used to specify CA certificate locations	2275	variables are nonempty, they will be used to specify CA certificate
2024	instead of a system-dependent default.	2276	locations instead of a system-dependent default.
2025		2277
2026	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>	2278	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
2027		2279
2028	When these are set to C<1>, then the respective modules are not	2280	When these are set to C<1>, then the respective modules are not
2029	loaded. Mostly good for testing AnyEvent itself.	2281	loaded. Mostly good for testing AnyEvent itself.
…		…
2361	(even when used without AnyEvent), but most event loops have acceptable	2613	(even when used without AnyEvent), but most event loops have acceptable
2362	performance with or without AnyEvent.	2614	performance with or without AnyEvent.
2363		2615
2364	=item * The overhead AnyEvent adds is usually much smaller than the overhead of	2616	=item * The overhead AnyEvent adds is usually much smaller than the overhead of
2365	the actual event loop, only with extremely fast event loops such as EV	2617	the actual event loop, only with extremely fast event loops such as EV
2366	adds AnyEvent significant overhead.	2618	does AnyEvent add significant overhead.
2367		2619
2368	=item * You should avoid POE like the plague if you want performance or	2620	=item * You should avoid POE like the plague if you want performance or
2369	reasonable memory usage.	2621	reasonable memory usage.
2370		2622
2371	=back	2623	=back
…		…
2746		2998
2747	Tutorial/Introduction: L<AnyEvent::Intro>.	2999	Tutorial/Introduction: L<AnyEvent::Intro>.
2748		3000
2749	FAQ: L<AnyEvent::FAQ>.	3001	FAQ: L<AnyEvent::FAQ>.
2750		3002
2751	Utility functions: L<AnyEvent::Util>.	3003	Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
		3004	(simply logging).
2752		3005
		3006	Development/Debugging: L<AnyEvent::Strict> (stricter checking),
		3007	L<AnyEvent::Debug> (interactive shell, watcher tracing).
		3008
2753	Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>,	3009	Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
2754	L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	3010	L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
		3011	L<Qt>, L<POE>, L<FLTK>.
2755		3012
2756	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	3013	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2757	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	3014	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2758	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	3015	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2759	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.	3016	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
		3017	L<AnyEvent::Impl::FLTK>.
2760		3018
2761	Non-blocking file handles, sockets, TCP clients and	3019	Non-blocking handles, pipes, stream sockets, TCP clients and
2762	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	3020	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
		3021
		3022	Asynchronous File I/O: L<AnyEvent::IO>.
2763		3023
2764	Asynchronous DNS: L<AnyEvent::DNS>.	3024	Asynchronous DNS: L<AnyEvent::DNS>.
2765		3025
2766	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.	3026	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.
2767		3027
…		…
2770		3030
2771		3031
2772	=head1 AUTHOR	3032	=head1 AUTHOR
2773		3033
2774	Marc Lehmann <schmorp@schmorp.de>	3034	Marc Lehmann <schmorp@schmorp.de>
2775	http://home.schmorp.de/	3035	http://anyevent.schmorp.de
2776		3036
2777	=cut	3037	=cut
2778		3038
2779	1	3039	1
2780		3040

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.356 by root, Fri Aug 12 18:41:25 2011 UTC vs. Revision 1.408 by root, Thu Dec 6 12:04:23 2012 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.356 by root, Fri Aug 12 18:41:25 2011 UTC vs.
Revision 1.408 by root, Thu Dec 6 12:04:23 2012 UTC