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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.353 by root, Thu Aug 11 20:56:07 2011 UTC vs.
Revision 1.396 by root, Sat Mar 10 17:36:24 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	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
452		450
…		…
878	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	876	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
879	AnyEvent::Impl::POE based on POE, very slow, some limitations.	877	AnyEvent::Impl::POE based on POE, very slow, some limitations.
880	AnyEvent::Impl::Irssi used when running within irssi.	878	AnyEvent::Impl::Irssi used when running within irssi.
881	AnyEvent::Impl::IOAsync based on IO::Async.	879	AnyEvent::Impl::IOAsync based on IO::Async.
882	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.	880	AnyEvent::Impl::Cocoa based on Cocoa::EventLoop.
883	AnyEvent::Impl::FLTK based on FLTK.	881	AnyEvent::Impl::FLTK based on FLTK (fltk 2 binding).
884		882
885	=item Backends with special needs.	883	=item Backends with special needs.
886		884
887	Qt requires the Qt::Application to be instantiated first, but will	885	Qt requires the Qt::Application to be instantiated first, but will
888	otherwise be picked up automatically. As long as the main program	886	otherwise be picked up automatically. As long as the main program
…		…
933		931
934	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model	932	Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model
935	if necessary. You should only call this function right before you would	933	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	934	have created an AnyEvent watcher anyway, that is, as late as possible at
937	runtime, and not e.g. during initialisation of your module.	935	runtime, and not e.g. during initialisation of your module.
		936
		937	The effect of calling this function is as if a watcher had been created
		938	(specifically, actions that happen "when the first watcher is created"
		939	happen when calling detetc as well).
938		940
939	If you need to do some initialisation before AnyEvent watchers are	941	If you need to do some initialisation before AnyEvent watchers are
940	created, use C<post_detect>.	942	created, use C<post_detect>.
941		943
942	=item $guard = AnyEvent::post_detect { BLOCK }	944	=item $guard = AnyEvent::post_detect { BLOCK }
…		…
1005	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent	1007	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
1006	# as soon as it is	1008	# as soon as it is
1007	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };	1009	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
1008	}	1010	}
1009		1011
1010	=item AnyEvent::postpone BLOCK	1012	=item AnyEvent::postpone { BLOCK }
1011		1013
1012	Arranges for the block to be executed as soon as possible, but not before	1014	Arranges for the block to be executed as soon as possible, but not before
1013	the call itself returns. In practise, the block will be executed just	1015	the call itself returns. In practise, the block will be executed just
1014	before the event loop polls for new events, or shortly afterwards.	1016	before the event loop polls for new events, or shortly afterwards.
1015		1017
…		…
1045	It should use C<postpone>:	1047	It should use C<postpone>:
1046		1048
1047	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later	1049	AnyEvent::postpone { $cb->(undef) }, return # signal error to callback, later
1048	if $some_error_condition;	1050	if $some_error_condition;
1049		1051
		1052	=item AnyEvent::log $level, $msg[, @args]
		1053
		1054	Log the given C<$msg> at the given C<$level>.
		1055
		1056	If L<AnyEvent::Log> is not loaded then this function makes a simple test
		1057	to see whether the message will be logged. If the test succeeds it will
		1058	load AnyEvent::Log and call C<AnyEvent::Log::log> - consequently, look at
		1059	the L<AnyEvent::Log> documentation for details.
		1060
		1061	If the test fails it will simply return. Right now this happens when a
		1062	numerical loglevel is used and it is larger than the level specified via
		1063	C<$ENV{PERL_ANYEVENT_VERBOSE}>.
		1064
		1065	If you want to sprinkle loads of logging calls around your code, consider
		1066	creating a logger callback with the C<AnyEvent::Log::logger> function,
		1067	which can reduce typing, codesize and can reduce the logging overhead
		1068	enourmously.
		1069
1050	=back	1070	=back
1051		1071
1052	=head1 WHAT TO DO IN A MODULE	1072	=head1 WHAT TO DO IN A MODULE
1053		1073
1054	As a module author, you should C<use AnyEvent> and call AnyEvent methods	1074	As a module author, you should C<use AnyEvent> and call AnyEvent methods
…		…
1110		1130
1111		1131
1112	=head1 OTHER MODULES	1132	=head1 OTHER MODULES
1113		1133
1114	The following is a non-exhaustive list of additional modules that use	1134	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	1135	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	1136	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.	1137	modules come as part of AnyEvent, the others are available via CPAN (see
		1138	L<http://search.cpan.org/search?m=module&q=anyevent%3A%3A*> for
		1139	a longer non-exhaustive list), and the list is heavily biased towards
		1140	modules of the AnyEvent author himself :)
1118		1141
1119	=over 4	1142	=over 4
1120		1143
1121	=item L<AnyEvent::Util>	1144	=item L<AnyEvent::Util>
1122		1145
…		…
1142	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>	1165	=item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP>
1143		1166
1144	Implement event-based interfaces to the protocols of the same name (for	1167	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	1168	the curious, IGS is the International Go Server and FCP is the Freenet
1146	Client Protocol).	1169	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		1170
1170	=item L<AnyEvent::AIO>	1171	=item L<AnyEvent::AIO>
1171		1172
1172	Truly asynchronous (as opposed to non-blocking) I/O, should be in the	1173	Truly asynchronous (as opposed to non-blocking) I/O, should be in the
1173	toolbox of every event programmer. AnyEvent::AIO transparently fuses	1174	toolbox of every event programmer. AnyEvent::AIO transparently fuses
1174	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based	1175	L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based
1175	file I/O, and much more.	1176	file I/O, and much more.
1176		1177
		1178	=item L<AnyEvent::Filesys::Notify>
		1179
		1180	AnyEvent is good for non-blocking stuff, but it can't detect file or
		1181	path changes (e.g. "watch this directory for new files", "watch this
		1182	file for changes"). The L<AnyEvent::Filesys::Notify> module promises to
		1183	do just that in a portbale fashion, supporting inotify on GNU/Linux and
		1184	some weird, without doubt broken, stuff on OS X to monitor files. It can
		1185	fall back to blocking scans at regular intervals transparently on other
		1186	platforms, so it's about as portable as it gets.
		1187
		1188	(I haven't used it myself, but I haven't heard anybody complaining about
		1189	it yet).
		1190
		1191	=item L<AnyEvent::DBI>
		1192
		1193	Executes L<DBI> requests asynchronously in a proxy process for you,
		1194	notifying you in an event-based way when the operation is finished.
		1195
1177	=item L<AnyEvent::HTTPD>	1196	=item L<AnyEvent::HTTPD>
1178		1197
1179	A simple embedded webserver.	1198	A simple embedded webserver.
1180		1199
1181	=item L<AnyEvent::FastPing>	1200	=item L<AnyEvent::FastPing>
1182		1201
1183	The fastest ping in the west.	1202	The fastest ping in the west.
1184		1203
1185	=item L<Coro>	1204	=item L<Coro>
1186		1205
1187	Has special support for AnyEvent via L<Coro::AnyEvent>.	1206	Has special support for AnyEvent via L<Coro::AnyEvent>, which allows you
		1207	to simply invert the flow control - don't call us, we will call you:
		1208
		1209	async {
		1210	Coro::AnyEvent::sleep 5; # creates a 5s timer and waits for it
		1211	print "5 seconds later!\n";
		1212
		1213	Coro::AnyEvent::readable *STDIN; # uses an I/O watcher
		1214	my $line = <STDIN>; # works for ttys
		1215
		1216	AnyEvent::HTTP::http_get "url", Coro::rouse_cb;
		1217	my ($body, $hdr) = Coro::rouse_wait;
		1218	};
1188		1219
1189	=back	1220	=back
1190		1221
1191	=cut	1222	=cut
1192		1223
…		…
1202		1233
1203	BEGIN { AnyEvent::common_sense }	1234	BEGIN { AnyEvent::common_sense }
1204		1235
1205	use Carp ();	1236	use Carp ();
1206		1237
1207	our $VERSION = '5.34';	1238	our $VERSION = '6.14';
1208	our $MODEL;	1239	our $MODEL;
1209
1210	our $AUTOLOAD;
1211	our @ISA;	1240	our @ISA;
1212
1213	our @REGISTRY;	1241	our @REGISTRY;
1214
1215	our $VERBOSE;	1242	our $VERBOSE;
		1243	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred
		1244	our $MAX_SIGNAL_LATENCY = $ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY} \|\| 10; # executes after the BEGIN block below (tainting!)
1216		1245
1217	BEGIN {	1246	BEGIN {
1218	require "AnyEvent/constants.pl";	1247	require "AnyEvent/constants.pl";
1219		1248
1220	eval "sub TAINT (){" . (${^TAINT}*1) . "}";	1249	eval "sub TAINT (){" . (${^TAINT}*1) . "}";
1221		1250
1222	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1251	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1223	if ${^TAINT};	1252	if ${^TAINT};
1224		1253
1225	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1254	$ENV{"PERL_ANYEVENT_$_"} = $ENV{"AE_$_"}
		1255	for grep s/^AE_// && !exists $ENV{"PERL_ANYEVENT_$_"}, keys %ENV;
1226		1256
1227	}	1257	@ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = ()
		1258	if ${^TAINT};
1228		1259
1229	our $MAX_SIGNAL_LATENCY = 10;	1260	# $ENV{PERL_ANYEVENT_xxx} now valid
1230		1261
1231	our %PROTOCOL; # (ipv4\|ipv6) => (1\|2), higher numbers are preferred	1262	$VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 4;
1232		1263
1233	{
1234	my $idx;	1264	my $idx;
1235	$PROTOCOL{$_} = ++$idx	1265	$PROTOCOL{$_} = ++$idx
1236	for reverse split /\s,\s/,	1266	for reverse split /\s,\s/,
1237	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1267	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1238	}	1268	}
1239		1269
		1270	our @post_detect;
		1271
		1272	sub post_detect(&) {
		1273	my ($cb) = @_;
		1274
		1275	push @post_detect, $cb;
		1276
		1277	defined wantarray
		1278	? bless \$cb, "AnyEvent::Util::postdetect"
		1279	: ()
		1280	}
		1281
		1282	sub AnyEvent::Util::postdetect::DESTROY {
		1283	@post_detect = grep $_ != ${$_[0]}, @post_detect;
		1284	}
		1285
		1286	our $POSTPONE_W;
		1287	our @POSTPONE;
		1288
		1289	sub _postpone_exec {
		1290	undef $POSTPONE_W;
		1291
		1292	&{ shift @POSTPONE }
		1293	while @POSTPONE;
		1294	}
		1295
		1296	sub postpone(&) {
		1297	push @POSTPONE, shift;
		1298
		1299	$POSTPONE_W \|\|= AE::timer (0, 0, \&_postpone_exec);
		1300
		1301	()
		1302	}
		1303
		1304	sub log($$;@) {
		1305	# only load the big bloated module when we actually are about to log something
		1306	if ($_[0] <= ($VERBOSE \|\| 1)) { # also catches non-numeric levels(!) and fatal
		1307	local ($!, $@);
		1308	require AnyEvent::Log; # among other things, sets $VERBOSE to 9
		1309	# AnyEvent::Log overwrites this function
		1310	goto &log;
		1311	}
		1312
		1313	0 # not logged
		1314	}
		1315
		1316	sub _logger($;$) {
		1317	my ($level, $renabled) = @_;
		1318
		1319	$$renabled = $level <= $VERBOSE;
		1320
		1321	my $logger = [(caller)[0], $level, $renabled];
		1322
		1323	$AnyEvent::Log::LOGGER{$logger+0} = $logger;
		1324
		1325	# return unless defined wantarray;
		1326	#
		1327	# require AnyEvent::Util;
		1328	# my $guard = AnyEvent::Util::guard (sub {
		1329	# # "clean up"
		1330	# delete $LOGGER{$logger+0};
		1331	# });
		1332	#
		1333	# sub {
		1334	# return 0 unless $$renabled;
		1335	#
		1336	# $guard if 0; # keep guard alive, but don't cause runtime overhead
		1337	# require AnyEvent::Log unless $AnyEvent::Log::VERSION;
		1338	# package AnyEvent::Log;
		1339	# _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time
		1340	# }
		1341	}
		1342
		1343	if (length $ENV{PERL_ANYEVENT_LOG}) {
		1344	require AnyEvent::Log; # AnyEvent::Log does the thing for us
		1345	}
		1346
1240	my @models = (	1347	our @models = (
1241	[EV:: => AnyEvent::Impl::EV:: , 1],	1348	[EV:: => AnyEvent::Impl::EV::],
1242	[AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1],	1349	[AnyEvent::Loop:: => AnyEvent::Impl::Perl::],
1243	# everything below here will not (normally) be autoprobed	1350	# everything below here will not (normally) be autoprobed
1244	# as the pure perl backend should work everywhere	1351	# as the pure perl backend should work everywhere
1245	# and is usually faster	1352	# and is usually faster
		1353	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package, so msut be near the top
1246	[Event:: => AnyEvent::Impl::Event::, 1],	1354	[Event:: => AnyEvent::Impl::Event::], # slow, stable
1247	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1355	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers
		1356	# everything below here should not be autoloaded
1248	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1357	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1249	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1250	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1358	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1251	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1359	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1252	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1360	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1253	[Wx:: => AnyEvent::Impl::POE::],	1361	[Wx:: => AnyEvent::Impl::POE::],
1254	[Prima:: => AnyEvent::Impl::POE::],	1362	[Prima:: => AnyEvent::Impl::POE::],
1255	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::],	1363	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # a bitch to autodetect
1256	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],	1364	[Cocoa::EventLoop:: => AnyEvent::Impl::Cocoa::],
1257	[FLTK:: => AnyEvent::Impl::FLTK::],	1365	[FLTK:: => AnyEvent::Impl::FLTK::],
1258	);	1366	);
1259		1367
1260	our %method = map +($_ => 1),	1368	our @isa_hook;
		1369
		1370	sub _isa_set {
		1371	my @pkg = ("AnyEvent", (map $_->[0], grep defined, @isa_hook), $MODEL);
		1372
		1373	@{"$pkg[$_-1]::ISA"} = $pkg[$_]
		1374	for 1 .. $#pkg;
		1375
		1376	grep $_ && $_->[1], @isa_hook
		1377	and AE::_reset ();
		1378	}
		1379
		1380	# used for hooking AnyEvent::Strict and AnyEvent::Debug::Wrap into the class hierarchy
		1381	sub _isa_hook($$;$) {
		1382	my ($i, $pkg, $reset_ae) = @_;
		1383
		1384	$isa_hook[$i] = $pkg ? [$pkg, $reset_ae] : undef;
		1385
		1386	_isa_set;
		1387	}
		1388
		1389	# all autoloaded methods reserve the complete glob, not just the method slot.
		1390	# due to bugs in perls method cache implementation.
1261	qw(io timer time now now_update signal child idle condvar DESTROY);	1391	our @methods = qw(io timer time now now_update signal child idle condvar);
1262
1263	our @post_detect;
1264
1265	sub post_detect(&) {
1266	my ($cb) = @_;
1267
1268	push @post_detect, $cb;
1269
1270	defined wantarray
1271	? bless \$cb, "AnyEvent::Util::postdetect"
1272	: ()
1273	}
1274
1275	sub AnyEvent::Util::postdetect::DESTROY {
1276	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1277	}
1278		1392
1279	sub detect() {	1393	sub detect() {
		1394	return $MODEL if $MODEL; # some programs keep references to detect
		1395
		1396	# IO::Async::Loop::AnyEvent is extremely evil, refuse to work with it
		1397	# the author knows about the problems and what it does to AnyEvent as a whole
		1398	# (and the ability of others to use AnyEvent), but simply wants to abuse AnyEvent
		1399	# anyway.
		1400	AnyEvent::log fatal => "AnyEvent: IO::Async::Loop::AnyEvent detected - that module is broken by\n"
		1401	. "design, abuses internals and breaks AnyEvent - will not continue."
		1402	if exists $INC{"IO/Async/Loop/AnyEvent.pm"};
		1403
		1404	local $!; # for good measure
		1405	local $SIG{__DIE__}; # we use eval
		1406
1280	# free some memory	1407	# free some memory
1281	*detect = sub () { $MODEL };	1408	*detect = sub () { $MODEL };
		1409	# undef &func doesn't correctly update the method cache. grmbl.
		1410	# so we delete the whole glob. grmbl.
		1411	# otoh, perl doesn't let me undef an active usb, but it lets me free
		1412	# a glob with an active sub. hrm. i hope it works, but perl is
		1413	# usually buggy in this department. sigh.
		1414	delete @{"AnyEvent::"}{@methods};
		1415	undef @methods;
1282		1416
1283	local $!; # for good measure
1284	local $SIG{__DIE__};
1285
1286	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1417	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z0-9:]+)$/) {
1287	my $model = "AnyEvent::Impl::$1";	1418	my $model = $1;
		1419	$model = "AnyEvent::Impl::$model" unless $model =~ s/::$//;
1288	if (eval "require $model") {	1420	if (eval "require $model") {
		1421	AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.";
1289	$MODEL = $model;	1422	$MODEL = $model;
1290	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
1291	} else {	1423	} else {
1292	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1424	AnyEvent::log 4 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@";
1293	}	1425	}
1294	}	1426	}
1295		1427
1296	# check for already loaded models	1428	# check for already loaded models
1297	unless ($MODEL) {	1429	unless ($MODEL) {
1298	for (@REGISTRY, @models) {	1430	for (@REGISTRY, @models) {
1299	my ($package, $model) = @$_;	1431	my ($package, $model) = @$_;
1300	if (${"$package\::VERSION"} > 0) {	1432	if (${"$package\::VERSION"} > 0) {
1301	if (eval "require $model") {	1433	if (eval "require $model") {
		1434	AnyEvent::log 7 => "autodetected model '$model', using it.";
1302	$MODEL = $model;	1435	$MODEL = $model;
1303	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1436	last;
		1437	} else {
		1438	AnyEvent::log 8 => "detected event loop $package, but cannot load '$model', skipping: $@";
		1439	}
		1440	}
		1441	}
		1442
		1443	unless ($MODEL) {
		1444	# try to autoload a model
		1445	for (@REGISTRY, @models) {
		1446	my ($package, $model) = @$_;
		1447	if (
		1448	eval "require $package"
		1449	and ${"$package\::VERSION"} > 0
		1450	and eval "require $model"
		1451	) {
		1452	AnyEvent::log 7 => "autoloaded model '$model', using it.";
		1453	$MODEL = $model;
1304	last;	1454	last;
1305	}	1455	}
1306	}	1456	}
1307	}
1308
1309	unless ($MODEL) {
1310	# try to autoload a model
1311	for (@REGISTRY, @models) {
1312	my ($package, $model, $autoload) = @$_;
1313	if (
1314	$autoload
1315	and eval "require $package"
1316	and ${"$package\::VERSION"} > 0
1317	and eval "require $model"
1318	) {
1319	$MODEL = $model;
1320	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1321	last;
1322	}
1323	}
1324		1457
1325	$MODEL	1458	$MODEL
1326	or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?\n";	1459	or AnyEvent::log fatal => "AnyEvent: backend autodetection failed - did you properly install AnyEvent?";
1327	}	1460	}
1328	}	1461	}
1329		1462
1330	@models = (); # free probe data	1463	# free memory only needed for probing
		1464	undef @models;
		1465	undef @REGISTRY;
1331		1466
1332	push @{"$MODEL\::ISA"}, "AnyEvent::Base";	1467	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1333	unshift @ISA, $MODEL;
1334		1468
1335	# now nuke some methods that are overridden by the backend.	1469	# now nuke some methods that are overridden by the backend.
1336	# SUPER is not allowed.	1470	# SUPER usage is not allowed in these.
1337	for (qw(time signal child idle)) {	1471	for (qw(time signal child idle)) {
1338	undef &{"AnyEvent::Base::$_"}	1472	undef &{"AnyEvent::Base::$_"}
1339	if defined &{"$MODEL\::$_"};	1473	if defined &{"$MODEL\::$_"};
1340	}	1474	}
1341		1475
		1476	_isa_set;
		1477
		1478	# we're officially open!
		1479
1342	if ($ENV{PERL_ANYEVENT_STRICT}) {	1480	if ($ENV{PERL_ANYEVENT_STRICT}) {
1343	eval { require AnyEvent::Strict };	1481	require AnyEvent::Strict;
1344	warn "AnyEvent: cannot load AnyEvent::Strict: $@"
1345	if $@ && $VERBOSE;
1346	}	1482	}
1347		1483
		1484	if ($ENV{PERL_ANYEVENT_DEBUG_WRAP}) {
		1485	require AnyEvent::Debug;
		1486	AnyEvent::Debug::wrap ($ENV{PERL_ANYEVENT_DEBUG_WRAP});
		1487	}
		1488
		1489	if (length $ENV{PERL_ANYEVENT_DEBUG_SHELL}) {
		1490	require AnyEvent::Socket;
		1491	require AnyEvent::Debug;
		1492
		1493	my $shell = $ENV{PERL_ANYEVENT_DEBUG_SHELL};
		1494	$shell =~ s/\$\$/$$/g;
		1495
		1496	my ($host, $service) = AnyEvent::Socket::parse_hostport ($shell);
		1497	$AnyEvent::Debug::SHELL = AnyEvent::Debug::shell ($host, $service);
		1498	}
		1499
		1500	# now the anyevent environment is set up as the user told us to, so
		1501	# call the actual user code - post detects
		1502
1348	(shift @post_detect)->() while @post_detect;	1503	(shift @post_detect)->() while @post_detect;
		1504	undef @post_detect;
1349		1505
1350	*post_detect = sub(&) {	1506	*post_detect = sub(&) {
1351	shift->();	1507	shift->();
1352		1508
1353	undef	1509	undef
1354	};	1510	};
1355		1511
1356	$MODEL	1512	$MODEL
1357	}	1513	}
1358		1514
1359	sub AUTOLOAD {	1515	for my $name (@methods) {
1360	(my $func = $AUTOLOAD) =~ s/.*://;	1516	*$name = sub {
1361
1362	$method{$func}
1363	or Carp::croak "$func: not a valid AnyEvent class method";
1364
1365	detect;	1517	detect;
1366		1518	# we use goto because
1367	my $class = shift;	1519	# a) it makes the thunk more transparent
1368	$class->$func (@_);	1520	# b) it allows us to delete the thunk later
1369	}	1521	goto &{ UNIVERSAL::can AnyEvent => "SUPER::$name" }
1370		1522	};
1371	our $POSTPONE_W;
1372	our @POSTPONE;
1373
1374	sub _postpone_exec {
1375	undef $POSTPONE_W;
1376	(pop @POSTPONE)->()
1377	while @POSTPONE;
1378	}
1379
1380	sub postpone(&) {
1381	push @POSTPONE, shift;
1382
1383	$POSTPONE_W \|\|= AE::timer (0, 0, \&_postpone_exec);
1384
1385	()
1386	}	1523	}
1387		1524
1388	# utility function to dup a filehandle. this is used by many backends	1525	# utility function to dup a filehandle. this is used by many backends
1389	# to support binding more than one watcher per filehandle (they usually	1526	# to support binding more than one watcher per filehandle (they usually
1390	# allow only one watcher per fd, so we dup it to get a different one).	1527	# allow only one watcher per fd, so we dup it to get a different one).
…		…
1414		1551
1415	package AE;	1552	package AE;
1416		1553
1417	our $VERSION = $AnyEvent::VERSION;	1554	our $VERSION = $AnyEvent::VERSION;
1418		1555
		1556	sub _reset() {
		1557	eval q{
1419	# fall back to the main API by default - backends and AnyEvent::Base	1558	# fall back to the main API by default - backends and AnyEvent::Base
1420	# implementations can overwrite these.	1559	# implementations can overwrite these.
1421		1560
1422	sub io($$$) {	1561	sub io($$$) {
1423	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])	1562	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1424	}	1563	}
1425		1564
1426	sub timer($$$) {	1565	sub timer($$$) {
1427	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])	1566	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
1428	}	1567	}
1429		1568
1430	sub signal($$) {	1569	sub signal($$) {
1431	AnyEvent->signal (signal => $_[0], cb => $_[1])	1570	AnyEvent->signal (signal => $_[0], cb => $_[1])
1432	}	1571	}
1433		1572
1434	sub child($$) {	1573	sub child($$) {
1435	AnyEvent->child (pid => $_[0], cb => $_[1])	1574	AnyEvent->child (pid => $_[0], cb => $_[1])
1436	}	1575	}
1437		1576
1438	sub idle($) {	1577	sub idle($) {
1439	AnyEvent->idle (cb => $_[0])	1578	AnyEvent->idle (cb => $_[0]);
1440	}	1579	}
1441		1580
1442	sub cv(;&) {	1581	sub cv(;&) {
1443	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())	1582	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1444	}	1583	}
1445		1584
1446	sub now() {	1585	sub now() {
1447	AnyEvent->now	1586	AnyEvent->now
1448	}	1587	}
1449		1588
1450	sub now_update() {	1589	sub now_update() {
1451	AnyEvent->now_update	1590	AnyEvent->now_update
1452	}	1591	}
1453		1592
1454	sub time() {	1593	sub time() {
1455	AnyEvent->time	1594	AnyEvent->time
		1595	}
		1596
		1597	*postpone = \&AnyEvent::postpone;
		1598	*log = \&AnyEvent::log;
		1599	};
		1600	die if $@;
1456	}	1601	}
		1602
		1603	BEGIN { _reset }
1457		1604
1458	package AnyEvent::Base;	1605	package AnyEvent::Base;
1459		1606
1460	# default implementations for many methods	1607	# default implementations for many methods
1461		1608
1462	sub time {	1609	sub time {
1463	eval q{ # poor man's autoloading {}	1610	eval q{ # poor man's autoloading {}
1464	# probe for availability of Time::HiRes	1611	# probe for availability of Time::HiRes
1465	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1612	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1466	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1613	*time = sub { Time::HiRes::time () };
1467	*AE::time = \&Time::HiRes::time;	1614	*AE::time = \& Time::HiRes::time ;
		1615	*now = \&time;
		1616	AnyEvent::log 8 => "AnyEvent: using Time::HiRes for sub-second timing accuracy.";
1468	# if (eval "use POSIX (); (POSIX::times())...	1617	# if (eval "use POSIX (); (POSIX::times())...
1469	} else {	1618	} else {
		1619	*time = sub { CORE::time };
		1620	*AE::time = sub (){ CORE::time };
		1621	*now = \&time;
1470	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1622	AnyEvent::log 3 => "using built-in time(), WARNING, no sub-second resolution!";
1471	*AE::time = sub (){ time }; # epic fail
1472	}	1623	}
1473
1474	*time = sub { AE::time }; # different prototypes
1475	};	1624	};
1476	die if $@;	1625	die if $@;
1477		1626
1478	&time	1627	&time
1479	}	1628	}
1480		1629
1481	*now = \&time;	1630	*now = \&time;
1482
1483	sub now_update { }	1631	sub now_update { }
1484		1632
1485	sub _poll {	1633	sub _poll {
1486	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";	1634	Carp::croak "$AnyEvent::MODEL does not support blocking waits. Caught";
1487	}	1635	}
…		…
1573		1721
1574	sub signal {	1722	sub signal {
1575	eval q{ # poor man's autoloading {}	1723	eval q{ # poor man's autoloading {}
1576	# probe for availability of Async::Interrupt	1724	# probe for availability of Async::Interrupt
1577	if (_have_async_interrupt) {	1725	if (_have_async_interrupt) {
1578	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1726	AnyEvent::log 8 => "using Async::Interrupt for race-free signal handling.";
1579		1727
1580	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1728	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1581	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;	1729	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1582		1730
1583	} else {	1731	} else {
1584	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1732	AnyEvent::log 8 => "using emulated perl signal handling with latency timer.";
1585		1733
1586	if (AnyEvent::WIN32) {	1734	if (AnyEvent::WIN32) {
1587	require AnyEvent::Util;	1735	require AnyEvent::Util;
1588		1736
1589	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1737	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
…		…
1665	: sysread $SIGPIPE_R, (my $dummy), 9;	1813	: sysread $SIGPIPE_R, (my $dummy), 9;
1666		1814
1667	while (%SIG_EV) {	1815	while (%SIG_EV) {
1668	for (keys %SIG_EV) {	1816	for (keys %SIG_EV) {
1669	delete $SIG_EV{$_};	1817	delete $SIG_EV{$_};
1670	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1818	&$_ for values %{ $SIG_CB{$_} \|\| {} };
1671	}	1819	}
1672	}	1820	}
1673	};	1821	};
1674	};	1822	};
1675	die if $@;	1823	die if $@;
…		…
1742		1890
1743	my ($cb, $w, $rcb) = $arg{cb};	1891	my ($cb, $w, $rcb) = $arg{cb};
1744		1892
1745	$rcb = sub {	1893	$rcb = sub {
1746	if ($cb) {	1894	if ($cb) {
1747	$w = _time;	1895	$w = AE::time;
1748	&$cb;	1896	&$cb;
1749	$w = _time - $w;	1897	$w = AE::time - $w;
1750		1898
1751	# never use more then 50% of the time for the idle watcher,	1899	# never use more then 50% of the time for the idle watcher,
1752	# within some limits	1900	# within some limits
1753	$w = 0.0001 if $w < 0.0001;	1901	$w = 0.0001 if $w < 0.0001;
1754	$w = 5 if $w > 5;	1902	$w = 5 if $w > 5;
…		…
1883	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and	2031	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
1884	so on.	2032	so on.
1885		2033
1886	=head1 ENVIRONMENT VARIABLES	2034	=head1 ENVIRONMENT VARIABLES
1887		2035
1888	The following environment variables are used by this module or its	2036	AnyEvent supports a number of environment variables that tune the
1889	submodules.	2037	runtime behaviour. They are usually evaluated when AnyEvent is
		2038	loaded, initialised, or a submodule that uses them is loaded. Many of
		2039	them also cause AnyEvent to load additional modules - for example,
		2040	C<PERL_ANYEVENT_DEBUG_WRAP> causes the L<AnyEvent::Debug> module to be
		2041	loaded.
1890		2042
1891	Note that AnyEvent will remove I<all> environment variables starting with	2043	All the environment variables documented here start with
1892	C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is	2044	C<PERL_ANYEVENT_>, which is what AnyEvent considers its own
1893	enabled.	2045	namespace. Other modules are encouraged (but by no means required) to use
		2046	C<PERL_ANYEVENT_SUBMODULE> if they have registered the AnyEvent::Submodule
		2047	namespace on CPAN, for any submodule. For example, L<AnyEvent::HTTP> could
		2048	be expected to use C<PERL_ANYEVENT_HTTP_PROXY> (it should not access env
		2049	variables starting with C<AE_>, see below).
		2050
		2051	All variables can also be set via the C<AE_> prefix, that is, instead
		2052	of setting C<PERL_ANYEVENT_VERBOSE> you can also set C<AE_VERBOSE>. In
		2053	case there is a clash btween anyevent and another program that uses
		2054	C<AE_something> you can set the corresponding C<PERL_ANYEVENT_something>
		2055	variable to the empty string, as those variables take precedence.
		2056
		2057	When AnyEvent is first loaded, it copies all C<AE_xxx> env variables
		2058	to their C<PERL_ANYEVENT_xxx> counterpart unless that variable already
		2059	exists. If taint mode is on, then AnyEvent will remove I<all> environment
		2060	variables starting with C<PERL_ANYEVENT_> from C<%ENV> (or replace them
		2061	with C<undef> or the empty string, if the corresaponding C<AE_> variable
		2062	is set).
		2063
		2064	The exact algorithm is currently:
		2065
		2066	1. if taint mode enabled, delete all PERL_ANYEVENT_xyz variables from %ENV
		2067	2. copy over AE_xyz to PERL_ANYEVENT_xyz unless the latter alraedy exists
		2068	3. if taint mode enabled, set all PERL_ANYEVENT_xyz variables to undef.
		2069
		2070	This ensures that child processes will not see the C<AE_> variables.
		2071
		2072	The following environment variables are currently known to AnyEvent:
1894		2073
1895	=over 4	2074	=over 4
1896		2075
1897	=item C<PERL_ANYEVENT_VERBOSE>	2076	=item C<PERL_ANYEVENT_VERBOSE>
1898		2077
1899	By default, AnyEvent will be completely silent except in fatal	2078	By default, AnyEvent will only log messages with loglevel C<3>
1900	conditions. You can set this environment variable to make AnyEvent more	2079	(C<critical>) or higher (see L<AnyEvent::Log>). You can set this
		2080	environment variable to a numerical loglevel to make AnyEvent more (or
1901	talkative.	2081	less) talkative.
1902		2082
		2083	If you want to do more than just set the global logging level
		2084	you should have a look at C<PERL_ANYEVENT_LOG>, which allows much more
		2085	complex specifications.
		2086
		2087	When set to C<0> (C<off>), then no messages whatsoever will be logged with
		2088	the default logging settings.
		2089
1903	When set to C<1> or higher, causes AnyEvent to warn about unexpected	2090	When set to C<5> or higher (C<warn>), causes AnyEvent to warn about
1904	conditions, such as not being able to load the event model specified by	2091	unexpected conditions, such as not being able to load the event model
1905	C<PERL_ANYEVENT_MODEL>.	2092	specified by C<PERL_ANYEVENT_MODEL>, or a guard callback throwing an
		2093	exception - this is the minimum recommended level.
1906		2094
1907	When set to C<2> or higher, cause AnyEvent to report to STDERR which event	2095	When set to C<7> or higher (info), cause AnyEvent to report which event model it
1908	model it chooses.	2096	chooses.
1909		2097
1910	When set to C<8> or higher, then AnyEvent will report extra information on	2098	When set to C<8> or higher (debug), then AnyEvent will report extra information on
1911	which optional modules it loads and how it implements certain features.	2099	which optional modules it loads and how it implements certain features.
		2100
		2101	=item C<PERL_ANYEVENT_LOG>
		2102
		2103	Accepts rather complex logging specifications. For example, you could log
		2104	all C<debug> messages of some module to stderr, warnings and above to
		2105	stderr, and errors and above to syslog, with:
		2106
		2107	PERL_ANYEVENT_LOG=Some::Module=debug,+log:filter=warn,+%syslog:%syslog=error,syslog
		2108
		2109	For the rather extensive details, see L<AnyEvent::Log>.
		2110
		2111	This variable is evaluated when AnyEvent (or L<AnyEvent::Log>) is loaded,
		2112	so will take effect even before AnyEvent has initialised itself.
		2113
		2114	Note that specifying this environment variable causes the L<AnyEvent::Log>
		2115	module to be loaded, while C<PERL_ANYEVENT_VERBOSE> does not, so only
		2116	using the latter saves a few hundred kB of memory until the first message
		2117	is being logged.
1912		2118
1913	=item C<PERL_ANYEVENT_STRICT>	2119	=item C<PERL_ANYEVENT_STRICT>
1914		2120
1915	AnyEvent does not do much argument checking by default, as thorough	2121	AnyEvent does not do much argument checking by default, as thorough
1916	argument checking is very costly. Setting this variable to a true value	2122	argument checking is very costly. Setting this variable to a true value
…		…
1923	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>	2129	Unlike C<use strict> (or its modern cousin, C<< use L<common::sense>
1924	>>, it is definitely recommended to keep it off in production. Keeping	2130	>>, it is definitely recommended to keep it off in production. Keeping
1925	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs	2131	C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs
1926	can be very useful, however.	2132	can be very useful, however.
1927		2133
		2134	=item C<PERL_ANYEVENT_DEBUG_SHELL>
		2135
		2136	If this env variable is nonempty, then its contents will be interpreted by
		2137	C<AnyEvent::Socket::parse_hostport> and C<AnyEvent::Debug::shell> (after
		2138	replacing every occurance of C<$$> by the process pid). The shell object
		2139	is saved in C<$AnyEvent::Debug::SHELL>.
		2140
		2141	This happens when the first watcher is created.
		2142
		2143	For example, to bind a debug shell on a unix domain socket in
		2144	F<< /tmp/debug<pid>.sock >>, you could use this:
		2145
		2146	PERL_ANYEVENT_DEBUG_SHELL=/tmp/debug\$\$.sock perlprog
		2147	# connect with e.g.: socat readline /tmp/debug123.sock
		2148
		2149	Or to bind to tcp port 4545 on localhost:
		2150
		2151	PERL_ANYEVENT_DEBUG_SHELL=127.0.0.1:4545 perlprog
		2152	# connect with e.g.: telnet localhost 4545
		2153
		2154	Note that creating sockets in F</tmp> or on localhost is very unsafe on
		2155	multiuser systems.
		2156
		2157	=item C<PERL_ANYEVENT_DEBUG_WRAP>
		2158
		2159	Can be set to C<0>, C<1> or C<2> and enables wrapping of all watchers for
		2160	debugging purposes. See C<AnyEvent::Debug::wrap> for details.
		2161
1928	=item C<PERL_ANYEVENT_MODEL>	2162	=item C<PERL_ANYEVENT_MODEL>
1929		2163
1930	This can be used to specify the event model to be used by AnyEvent, before	2164	This can be used to specify the event model to be used by AnyEvent, before
1931	auto detection and -probing kicks in. It must be a string consisting	2165	auto detection and -probing kicks in.
1932	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended	2166
		2167	It normally is a string consisting entirely of ASCII letters (e.g. C<EV>
		2168	or C<IOAsync>). The string C<AnyEvent::Impl::> gets prepended and the
1933	and the resulting module name is loaded and if the load was successful,	2169	resulting module name is loaded and - if the load was successful - used as
1934	used as event model. If it fails to load AnyEvent will proceed with	2170	event model backend. If it fails to load then AnyEvent will proceed with
1935	auto detection and -probing.	2171	auto detection and -probing.
1936		2172
1937	This functionality might change in future versions.	2173	If the string ends with C<::> instead (e.g. C<AnyEvent::Impl::EV::>) then
		2174	nothing gets prepended and the module name is used as-is (hint: C<::> at
		2175	the end of a string designates a module name and quotes it appropriately).
1938		2176
1939	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you	2177	For example, to force the pure perl model (L<AnyEvent::Loop::Perl>) you
1940	could start your program like this:	2178	could start your program like this:
1941		2179
1942	PERL_ANYEVENT_MODEL=Perl perl ...	2180	PERL_ANYEVENT_MODEL=Perl perl ...
…		…
1960	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	2198	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1961	- only support IPv4, never try to resolve or contact IPv6	2199	- only support IPv4, never try to resolve or contact IPv6
1962	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	2200	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1963	IPv6, but prefer IPv6 over IPv4.	2201	IPv6, but prefer IPv6 over IPv4.
1964		2202
		2203	=item C<PERL_ANYEVENT_HOSTS>
		2204
		2205	This variable, if specified, overrides the F</etc/hosts> file used by
		2206	L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
		2207	from that file instead.
		2208
1965	=item C<PERL_ANYEVENT_EDNS0>	2209	=item C<PERL_ANYEVENT_EDNS0>
1966		2210
1967	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension	2211	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
1968	for DNS. This extension is generally useful to reduce DNS traffic, but	2212	DNS. This extension is generally useful to reduce DNS traffic, especially
1969	some (broken) firewalls drop such DNS packets, which is why it is off by	2213	when DNSSEC is involved, but some (broken) firewalls drop such DNS
1970	default.	2214	packets, which is why it is off by default.
1971		2215
1972	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce	2216	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
1973	EDNS0 in its DNS requests.	2217	EDNS0 in its DNS requests.
1974		2218
1975	=item C<PERL_ANYEVENT_MAX_FORKS>	2219	=item C<PERL_ANYEVENT_MAX_FORKS>
…		…
1981		2225
1982	The default value for the C<max_outstanding> parameter for the default DNS	2226	The default value for the C<max_outstanding> parameter for the default DNS
1983	resolver - this is the maximum number of parallel DNS requests that are	2227	resolver - this is the maximum number of parallel DNS requests that are
1984	sent to the DNS server.	2228	sent to the DNS server.
1985		2229
		2230	=item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY>
		2231
		2232	Perl has inherently racy signal handling (you can basically choose between
		2233	losing signals and memory corruption) - pure perl event loops (including
		2234	C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore
		2235	have to poll regularly to avoid losing signals.
		2236
		2237	Some event loops are racy, but don't poll regularly, and some event loops
		2238	are written in C but are still racy. For those event loops, AnyEvent
		2239	installs a timer that regularly wakes up the event loop.
		2240
		2241	By default, the interval for this timer is C<10> seconds, but you can
		2242	override this delay with this environment variable (or by setting
		2243	the C<$AnyEvent::MAX_SIGNAL_LATENCY> variable before creating signal
		2244	watchers).
		2245
		2246	Lower values increase CPU (and energy) usage, higher values can introduce
		2247	long delays when reaping children or waiting for signals.
		2248
		2249	The L<AnyEvent::Async> module, if available, will be used to avoid this
		2250	polling (with most event loops).
		2251
1986	=item C<PERL_ANYEVENT_RESOLV_CONF>	2252	=item C<PERL_ANYEVENT_RESOLV_CONF>
1987		2253
1988	The file to use instead of F</etc/resolv.conf> (or OS-specific	2254	The absolute path to a F<resolv.conf>-style file to use instead of
1989	configuration) in the default resolver. When set to the empty string, no	2255	F</etc/resolv.conf> (or the OS-specific configuration) in the default
1990	default config will be used.	2256	resolver, or the empty string to select the default configuration.
1991		2257
1992	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.	2258	=item C<PERL_ANYEVENT_CA_FILE>, C<PERL_ANYEVENT_CA_PATH>.
1993		2259
1994	When neither C<ca_file> nor C<ca_path> was specified during	2260	When neither C<ca_file> nor C<ca_path> was specified during
1995	L<AnyEvent::TLS> context creation, and either of these environment	2261	L<AnyEvent::TLS> context creation, and either of these environment
1996	variables exist, they will be used to specify CA certificate locations	2262	variables are nonempty, they will be used to specify CA certificate
1997	instead of a system-dependent default.	2263	locations instead of a system-dependent default.
1998		2264
1999	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>	2265	=item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT>
2000		2266
2001	When these are set to C<1>, then the respective modules are not	2267	When these are set to C<1>, then the respective modules are not
2002	loaded. Mostly good for testing AnyEvent itself.	2268	loaded. Mostly good for testing AnyEvent itself.
…		…
2334	(even when used without AnyEvent), but most event loops have acceptable	2600	(even when used without AnyEvent), but most event loops have acceptable
2335	performance with or without AnyEvent.	2601	performance with or without AnyEvent.
2336		2602
2337	=item * The overhead AnyEvent adds is usually much smaller than the overhead of	2603	=item * The overhead AnyEvent adds is usually much smaller than the overhead of
2338	the actual event loop, only with extremely fast event loops such as EV	2604	the actual event loop, only with extremely fast event loops such as EV
2339	adds AnyEvent significant overhead.	2605	does AnyEvent add significant overhead.
2340		2606
2341	=item * You should avoid POE like the plague if you want performance or	2607	=item * You should avoid POE like the plague if you want performance or
2342	reasonable memory usage.	2608	reasonable memory usage.
2343		2609
2344	=back	2610	=back
…		…
2719		2985
2720	Tutorial/Introduction: L<AnyEvent::Intro>.	2986	Tutorial/Introduction: L<AnyEvent::Intro>.
2721		2987
2722	FAQ: L<AnyEvent::FAQ>.	2988	FAQ: L<AnyEvent::FAQ>.
2723		2989
2724	Utility functions: L<AnyEvent::Util>.	2990	Utility functions: L<AnyEvent::Util> (misc. grab-bag), L<AnyEvent::Log>
		2991	(simply logging).
2725		2992
		2993	Development/Debugging: L<AnyEvent::Strict> (stricter checking),
		2994	L<AnyEvent::Debug> (interactive shell, watcher tracing).
		2995
2726	Event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>, L<Glib::EV>,	2996	Supported event modules: L<AnyEvent::Loop>, L<EV>, L<EV::Glib>,
2727	L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2997	L<Glib::EV>, L<Event>, L<Glib::Event>, L<Glib>, L<Tk>, L<Event::Lib>,
		2998	L<Qt>, L<POE>, L<FLTK>.
2728		2999
2729	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	3000	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2730	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	3001	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2731	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	3002	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2732	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.	3003	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>,
		3004	L<AnyEvent::Impl::FLTK>.
2733		3005
2734	Non-blocking file handles, sockets, TCP clients and	3006	Non-blocking handles, pipes, stream sockets, TCP clients and
2735	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	3007	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2736		3008
2737	Asynchronous DNS: L<AnyEvent::DNS>.	3009	Asynchronous DNS: L<AnyEvent::DNS>.
2738		3010
2739	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.	3011	Thread support: L<Coro>, L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.353 by root, Thu Aug 11 20:56:07 2011 UTC vs. Revision 1.396 by root, Sat Mar 10 17:36:24 2012 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.353 by root, Thu Aug 11 20:56:07 2011 UTC vs.
Revision 1.396 by root, Sat Mar 10 17:36:24 2012 UTC