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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.272 by root, Thu Aug 6 13:31:01 2009 UTC vs.
Revision 1.312 by root, Mon Feb 15 18:02:35 2010 UTC

…		…
363	might affect timers and time-outs.	363	might affect timers and time-outs.
364		364
365	When this is the case, you can call this method, which will update the	365	When this is the case, you can call this method, which will update the
366	event loop's idea of "current time".	366	event loop's idea of "current time".
367		367
		368	A typical example would be a script in a web server (e.g. C<mod_perl>) -
		369	when mod_perl executes the script, then the event loop will have the wrong
		370	idea about the "current time" (being potentially far in the past, when the
		371	script ran the last time). In that case you should arrange a call to C<<
		372	AnyEvent->now_update >> each time the web server process wakes up again
		373	(e.g. at the start of your script, or in a handler).
		374
368	Note that updating the time I<might> cause some events to be handled.	375	Note that updating the time I<might> cause some events to be handled.
369		376
370	=back	377	=back
371		378
372	=head2 SIGNAL WATCHERS	379	=head2 SIGNAL WATCHERS
…		…
395	correctly.	402	correctly.
396		403
397	Example: exit on SIGINT	404	Example: exit on SIGINT
398		405
399	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	406	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		407
		408	=head3 Restart Behaviour
		409
		410	While restart behaviour is up to the event loop implementation, most will
		411	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		412	pure perl implementation).
		413
		414	=head3 Safe/Unsafe Signals
		415
		416	Perl signals can be either "safe" (synchronous to opcode handling) or
		417	"unsafe" (asynchronous) - the former might get delayed indefinitely, the
		418	latter might corrupt your memory.
		419
		420	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		421	i.e. they will not interrupt your running perl program but will only be
		422	called as part of the normal event handling (just like timer, I/O etc.
		423	callbacks, too).
400		424
401	=head3 Signal Races, Delays and Workarounds	425	=head3 Signal Races, Delays and Workarounds
402		426
403	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	427	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
404	callbacks to signals in a generic way, which is a pity, as you cannot	428	callbacks to signals in a generic way, which is a pity, as you cannot
…		…
479		503
480	=head2 IDLE WATCHERS	504	=head2 IDLE WATCHERS
481		505
482	$w = AnyEvent->idle (cb => <callback>);	506	$w = AnyEvent->idle (cb => <callback>);
483		507
484	Sometimes there is a need to do something, but it is not so important	508	Repeatedly invoke the callback after the process becomes idle, until
485	to do it instantly, but only when there is nothing better to do. This	509	either the watcher is destroyed or new events have been detected.
486	"nothing better to do" is usually defined to be "no other events need
487	attention by the event loop".
488		510
489	Idle watchers ideally get invoked when the event loop has nothing	511	Idle watchers are useful when there is a need to do something, but it
490	better to do, just before it would block the process to wait for new	512	is not so important (or wise) to do it instantly. The callback will be
491	events. Instead of blocking, the idle watcher is invoked.	513	invoked only when there is "nothing better to do", which is usually
		514	defined as "all outstanding events have been handled and no new events
		515	have been detected". That means that idle watchers ideally get invoked
		516	when the event loop has just polled for new events but none have been
		517	detected. Instead of blocking to wait for more events, the idle watchers
		518	will be invoked.
492		519
493	Most event loops unfortunately do not really support idle watchers (only	520	Unfortunately, most event loops do not really support idle watchers (only
494	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	521	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
495	will simply call the callback "from time to time".	522	will simply call the callback "from time to time".
496		523
497	Example: read lines from STDIN, but only process them when the	524	Example: read lines from STDIN, but only process them when the
498	program is otherwise idle:	525	program is otherwise idle:
…		…
592	after => 1,	619	after => 1,
593	cb => sub { $result_ready->send },	620	cb => sub { $result_ready->send },
594	);	621	);
595		622
596	# this "blocks" (while handling events) till the callback	623	# this "blocks" (while handling events) till the callback
597	# calls -<send	624	# calls ->send
598	$result_ready->recv;	625	$result_ready->recv;
599		626
600	Example: wait for a timer, but take advantage of the fact that condition	627	Example: wait for a timer, but take advantage of the fact that condition
601	variables are also callable directly.	628	variables are also callable directly.
602		629
…		…
666	one. For example, a function that pings many hosts in parallel might want	693	one. For example, a function that pings many hosts in parallel might want
667	to use a condition variable for the whole process.	694	to use a condition variable for the whole process.
668		695
669	Every call to C<< ->begin >> will increment a counter, and every call to	696	Every call to C<< ->begin >> will increment a counter, and every call to
670	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	697	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
671	>>, the (last) callback passed to C<begin> will be executed. That callback	698	>>, the (last) callback passed to C<begin> will be executed, passing the
672	is I<supposed> to call C<< ->send >>, but that is not required. If no	699	condvar as first argument. That callback is I<supposed> to call C<< ->send
673	callback was set, C<send> will be called without any arguments.	700	>>, but that is not required. If no group callback was set, C<send> will
		701	be called without any arguments.
674		702
675	You can think of C<< $cv->send >> giving you an OR condition (one call	703	You can think of C<< $cv->send >> giving you an OR condition (one call
676	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	704	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
677	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	705	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
678		706
…		…
705	begung can potentially be zero:	733	begung can potentially be zero:
706		734
707	my $cv = AnyEvent->condvar;	735	my $cv = AnyEvent->condvar;
708		736
709	my %result;	737	my %result;
710	$cv->begin (sub { $cv->send (\%result) });	738	$cv->begin (sub { shift->send (\%result) });
711		739
712	for my $host (@list_of_hosts) {	740	for my $host (@list_of_hosts) {
713	$cv->begin;	741	$cv->begin;
714	ping_host_then_call_callback $host, sub {	742	ping_host_then_call_callback $host, sub {
715	$result{$host} = ...;	743	$result{$host} = ...;
…		…
806	=over 4	834	=over 4
807		835
808	=item Backends that are autoprobed when no other event loop can be found.	836	=item Backends that are autoprobed when no other event loop can be found.
809		837
810	EV is the preferred backend when no other event loop seems to be in	838	EV is the preferred backend when no other event loop seems to be in
811	use. If EV is not installed, then AnyEvent will try Event, and, failing	839	use. If EV is not installed, then AnyEvent will fall back to its own
812	that, will fall back to its own pure-perl implementation, which is	840	pure-perl implementation, which is available everywhere as it comes with
813	available everywhere as it comes with AnyEvent itself.	841	AnyEvent itself.
814		842
815	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	843	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
816	AnyEvent::Impl::Event based on Event, very stable, few glitches.
817	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	844	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
818		845
819	=item Backends that are transparently being picked up when they are used.	846	=item Backends that are transparently being picked up when they are used.
820		847
821	These will be used when they are currently loaded when the first watcher	848	These will be used when they are currently loaded when the first watcher
822	is created, in which case it is assumed that the application is using	849	is created, in which case it is assumed that the application is using
823	them. This means that AnyEvent will automatically pick the right backend	850	them. This means that AnyEvent will automatically pick the right backend
824	when the main program loads an event module before anything starts to	851	when the main program loads an event module before anything starts to
825	create watchers. Nothing special needs to be done by the main program.	852	create watchers. Nothing special needs to be done by the main program.
826		853
		854	AnyEvent::Impl::Event based on Event, very stable, few glitches.
827	AnyEvent::Impl::Glib based on Glib, slow but very stable.	855	AnyEvent::Impl::Glib based on Glib, slow but very stable.
828	AnyEvent::Impl::Tk based on Tk, very broken.	856	AnyEvent::Impl::Tk based on Tk, very broken.
829	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	857	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
830	AnyEvent::Impl::POE based on POE, very slow, some limitations.	858	AnyEvent::Impl::POE based on POE, very slow, some limitations.
831	AnyEvent::Impl::Irssi used when running within irssi.	859	AnyEvent::Impl::Irssi used when running within irssi.
…		…
941	You should check C<$AnyEvent::MODEL> before adding to this array, though:	969	You should check C<$AnyEvent::MODEL> before adding to this array, though:
942	if it is defined then the event loop has already been detected, and the	970	if it is defined then the event loop has already been detected, and the
943	array will be ignored.	971	array will be ignored.
944		972
945	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	973	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
946	it,as it takes care of these details.	974	it, as it takes care of these details.
947		975
948	This variable is mainly useful for modules that can do something useful	976	This variable is mainly useful for modules that can do something useful
949	when AnyEvent is used and thus want to know when it is initialised, but do	977	when AnyEvent is used and thus want to know when it is initialised, but do
950	not need to even load it by default. This array provides the means to hook	978	not need to even load it by default. This array provides the means to hook
951	into AnyEvent passively, without loading it.	979	into AnyEvent passively, without loading it.
		980
		981	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		982	together, you could put this into Coro (this is the actual code used by
		983	Coro to accomplish this):
		984
		985	if (defined $AnyEvent::MODEL) {
		986	# AnyEvent already initialised, so load Coro::AnyEvent
		987	require Coro::AnyEvent;
		988	} else {
		989	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		990	# as soon as it is
		991	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		992	}
952		993
953	=back	994	=back
954		995
955	=head1 WHAT TO DO IN A MODULE	996	=head1 WHAT TO DO IN A MODULE
956		997
…		…
1105		1146
1106	package AnyEvent;	1147	package AnyEvent;
1107		1148
1108	# basically a tuned-down version of common::sense	1149	# basically a tuned-down version of common::sense
1109	sub common_sense {	1150	sub common_sense {
1110	# no warnings	1151	# from common:.sense 1.0
1111	${^WARNING_BITS} ^= ${^WARNING_BITS};	1152	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1112	# use strict vars subs	1153	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1113	$^H \|= 0x00000600;	1154	$^H \|= 0x00000600;
1114	}	1155	}
1115		1156
1116	BEGIN { AnyEvent::common_sense }	1157	BEGIN { AnyEvent::common_sense }
1117		1158
1118	use Carp ();	1159	use Carp ();
1119		1160
1120	our $VERSION = 4.901;	1161	our $VERSION = '5.24';
1121	our $MODEL;	1162	our $MODEL;
1122		1163
1123	our $AUTOLOAD;	1164	our $AUTOLOAD;
1124	our @ISA;	1165	our @ISA;
1125		1166
1126	our @REGISTRY;	1167	our @REGISTRY;
1127		1168
1128	our $WIN32;
1129
1130	our $VERBOSE;	1169	our $VERBOSE;
1131		1170
1132	BEGIN {	1171	BEGIN {
		1172	eval "sub CYGWIN(){" . (($^O =~ /cygwin/i) *1) . "}";
1133	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1173	eval "sub WIN32 (){" . (($^O =~ /mswin32/i)*1) . "}";
1134	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1174	eval "sub TAINT (){" . (${^TAINT} *1) . "}";
1135		1175
1136	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1176	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1137	if ${^TAINT};	1177	if ${^TAINT};
1138		1178
1139	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1179	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1151	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1191	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1152	}	1192	}
1153		1193
1154	my @models = (	1194	my @models = (
1155	[EV:: => AnyEvent::Impl::EV:: , 1],	1195	[EV:: => AnyEvent::Impl::EV:: , 1],
1156	[Event:: => AnyEvent::Impl::Event::, 1],
1157	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1196	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1158	# everything below here will not (normally) be autoprobed	1197	# everything below here will not (normally) be autoprobed
1159	# as the pureperl backend should work everywhere	1198	# as the pureperl backend should work everywhere
1160	# and is usually faster	1199	# and is usually faster
		1200	[Event:: => AnyEvent::Impl::Event::, 1],
1161	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1201	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1162	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1202	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1163	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1203	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1164	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1204	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1165	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1205	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
…		…
1168	[Prima:: => AnyEvent::Impl::POE::],	1208	[Prima:: => AnyEvent::Impl::POE::],
1169	# IO::Async is just too broken - we would need workarounds for its	1209	# IO::Async is just too broken - we would need workarounds for its
1170	# byzantine signal and broken child handling, among others.	1210	# byzantine signal and broken child handling, among others.
1171	# IO::Async is rather hard to detect, as it doesn't have any	1211	# IO::Async is rather hard to detect, as it doesn't have any
1172	# obvious default class.	1212	# obvious default class.
1173	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1213	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1174	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1214	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1175	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1215	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1216	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1176	);	1217	);
1177		1218
1178	our %method = map +($_ => 1),	1219	our %method = map +($_ => 1),
1179	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1220	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1180		1221
…		…
1199	sub AnyEvent::Util::postdetect::DESTROY {	1240	sub AnyEvent::Util::postdetect::DESTROY {
1200	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1241	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1201	}	1242	}
1202		1243
1203	sub detect() {	1244	sub detect() {
		1245	# free some memory
		1246	*detect = sub () { $MODEL };
		1247
		1248	local $!; # for good measure
		1249	local $SIG{__DIE__};
		1250
		1251	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1252	my $model = "AnyEvent::Impl::$1";
		1253	if (eval "require $model") {
		1254	$MODEL = $model;
		1255	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1256	} else {
		1257	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1258	}
		1259	}
		1260
		1261	# check for already loaded models
1204	unless ($MODEL) {	1262	unless ($MODEL) {
1205	local $SIG{__DIE__};	1263	for (@REGISTRY, @models) {
1206		1264	my ($package, $model) = @$_;
1207	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1265	if (${"$package\::VERSION"} > 0) {
1208	my $model = "AnyEvent::Impl::$1";
1209	if (eval "require $model") {	1266	if (eval "require $model") {
1210	$MODEL = $model;	1267	$MODEL = $model;
1211	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1268	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1212	} else {	1269	last;
1213	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1270	}
1214	}	1271	}
1215	}	1272	}
1216		1273
1217	# check for already loaded models
1218	unless ($MODEL) {	1274	unless ($MODEL) {
		1275	# try to autoload a model
1219	for (@REGISTRY, @models) {	1276	for (@REGISTRY, @models) {
1220	my ($package, $model) = @$_;	1277	my ($package, $model, $autoload) = @$_;
		1278	if (
		1279	$autoload
		1280	and eval "require $package"
1221	if (${"$package\::VERSION"} > 0) {	1281	and ${"$package\::VERSION"} > 0
1222	if (eval "require $model") {	1282	and eval "require $model"
		1283	) {
1223	$MODEL = $model;	1284	$MODEL = $model;
1224	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1285	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1225	last;	1286	last;
1226	}
1227	}	1287	}
1228	}	1288	}
1229		1289
1230	unless ($MODEL) {
1231	# try to autoload a model
1232	for (@REGISTRY, @models) {
1233	my ($package, $model, $autoload) = @$_;
1234	if (
1235	$autoload
1236	and eval "require $package"
1237	and ${"$package\::VERSION"} > 0
1238	and eval "require $model"
1239	) {
1240	$MODEL = $model;
1241	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1242	last;
1243	}
1244	}
1245
1246	$MODEL	1290	$MODEL
1247	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1291	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1248	}
1249	}	1292	}
1250
1251	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1252
1253	unshift @ISA, $MODEL;
1254
1255	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1256
1257	(shift @post_detect)->() while @post_detect;
1258	}	1293	}
		1294
		1295	@models = (); # free probe data
		1296
		1297	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1298	unshift @ISA, $MODEL;
		1299
		1300	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1301
		1302	(shift @post_detect)->() while @post_detect;
1259		1303
1260	$MODEL	1304	$MODEL
1261	}	1305	}
1262		1306
1263	sub AUTOLOAD {	1307	sub AUTOLOAD {
1264	(my $func = $AUTOLOAD) =~ s/.*://;	1308	(my $func = $AUTOLOAD) =~ s/.*://;
1265		1309
1266	$method{$func}	1310	$method{$func}
1267	or Carp::croak "$func: not a valid method for AnyEvent objects";	1311	or Carp::croak "$func: not a valid AnyEvent class method";
1268		1312
1269	detect unless $MODEL;	1313	detect;
1270		1314
1271	my $class = shift;	1315	my $class = shift;
1272	$class->$func (@_);	1316	$class->$func (@_);
1273	}	1317	}
1274		1318
…		…
1287	# we assume CLOEXEC is already set by perl in all important cases	1331	# we assume CLOEXEC is already set by perl in all important cases
1288		1332
1289	($fh2, $rw)	1333	($fh2, $rw)
1290	}	1334	}
1291		1335
		1336	=head1 SIMPLIFIED AE API
		1337
		1338	Starting with version 5.0, AnyEvent officially supports a second, much
		1339	simpler, API that is designed to reduce the calling, typing and memory
		1340	overhead.
		1341
		1342	See the L<AE> manpage for details.
		1343
		1344	=cut
		1345
		1346	package AE;
		1347
		1348	our $VERSION = $AnyEvent::VERSION;
		1349
		1350	sub io($$$) {
		1351	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1352	}
		1353
		1354	sub timer($$$) {
		1355	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1356	}
		1357
		1358	sub signal($$) {
		1359	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1360	}
		1361
		1362	sub child($$) {
		1363	AnyEvent->child (pid => $_[0], cb => $_[1])
		1364	}
		1365
		1366	sub idle($) {
		1367	AnyEvent->idle (cb => $_[0])
		1368	}
		1369
		1370	sub cv(;&) {
		1371	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1372	}
		1373
		1374	sub now() {
		1375	AnyEvent->now
		1376	}
		1377
		1378	sub now_update() {
		1379	AnyEvent->now_update
		1380	}
		1381
		1382	sub time() {
		1383	AnyEvent->time
		1384	}
		1385
1292	package AnyEvent::Base;	1386	package AnyEvent::Base;
1293		1387
1294	# default implementations for many methods	1388	# default implementations for many methods
1295		1389
1296	sub _time {	1390	sub _time() {
		1391	eval q{ # poor man's autoloading
1297	# probe for availability of Time::HiRes	1392	# probe for availability of Time::HiRes
1298	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1393	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1299	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1394	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1300	*_time = \&Time::HiRes::time;	1395	*_time = \&Time::HiRes::time;
1301	# if (eval "use POSIX (); (POSIX::times())...	1396	# if (eval "use POSIX (); (POSIX::times())...
1302	} else {	1397	} else {
1303	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1398	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1304	*_time = sub { time }; # epic fail	1399	*_time = sub (){ time }; # epic fail
		1400	}
1305	}	1401	};
		1402	die if $@;
1306		1403
1307	&_time	1404	&_time
1308	}	1405	}
1309		1406
1310	sub time { _time }	1407	sub time { _time }
…		…
1321		1418
1322	our $HAVE_ASYNC_INTERRUPT;	1419	our $HAVE_ASYNC_INTERRUPT;
1323		1420
1324	sub _have_async_interrupt() {	1421	sub _have_async_interrupt() {
1325	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1422	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1326	&& eval "use Async::Interrupt 1.0 (); 1")	1423	&& eval "use Async::Interrupt 1.02 (); 1")
1327	unless defined $HAVE_ASYNC_INTERRUPT;	1424	unless defined $HAVE_ASYNC_INTERRUPT;
1328		1425
1329	$HAVE_ASYNC_INTERRUPT	1426	$HAVE_ASYNC_INTERRUPT
1330	}	1427	}
1331		1428
1332	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1429	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1333	our (%SIG_ASY, %SIG_ASY_W);	1430	our (%SIG_ASY, %SIG_ASY_W);
1334	our ($SIG_COUNT, $SIG_TW);	1431	our ($SIG_COUNT, $SIG_TW);
1335		1432
1336	sub _signal_exec {
1337	$HAVE_ASYNC_INTERRUPT
1338	? $SIGPIPE_R->drain
1339	: sysread $SIGPIPE_R, my $dummy, 9;
1340
1341	while (%SIG_EV) {
1342	for (keys %SIG_EV) {
1343	delete $SIG_EV{$_};
1344	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1345	}
1346	}
1347	}
1348
1349	# install a dummy wakeup watcher to reduce signal catching latency	1433	# install a dummy wakeup watcher to reduce signal catching latency
		1434	# used by Impls
1350	sub _sig_add() {	1435	sub _sig_add() {
1351	unless ($SIG_COUNT++) {	1436	unless ($SIG_COUNT++) {
1352	# try to align timer on a full-second boundary, if possible	1437	# try to align timer on a full-second boundary, if possible
1353	my $NOW = AnyEvent->now;	1438	my $NOW = AE::now;
1354		1439
1355	$SIG_TW = AnyEvent->timer (	1440	$SIG_TW = AE::timer
1356	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1441	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1357	interval => $MAX_SIGNAL_LATENCY,	1442	$MAX_SIGNAL_LATENCY,
1358	cb => sub { }, # just for the PERL_ASYNC_CHECK	1443	sub { } # just for the PERL_ASYNC_CHECK
1359	);	1444	;
1360	}	1445	}
1361	}	1446	}
1362		1447
1363	sub _sig_del {	1448	sub _sig_del {
1364	undef $SIG_TW	1449	undef $SIG_TW
…		…
1401	# probe for availability of Async::Interrupt	1486	# probe for availability of Async::Interrupt
1402	if (_have_async_interrupt) {	1487	if (_have_async_interrupt) {
1403	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1488	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1404		1489
1405	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1490	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1406	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);	1491	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1407		1492
1408	} else {	1493	} else {
1409	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1494	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1410		1495
1411	require Fcntl;	1496	require Fcntl;
…		…
1427	}	1512	}
1428		1513
1429	$SIGPIPE_R	1514	$SIGPIPE_R
1430	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1515	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1431		1516
1432	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);	1517	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
1433	}	1518	}
1434		1519
1435	*signal = sub {	1520	*signal = sub {
1436	my (undef, %arg) = @_;	1521	my (undef, %arg) = @_;
1437		1522
…		…
1485	# print weird messages, or just unconditionally exit	1570	# print weird messages, or just unconditionally exit
1486	# instead of getting the default action.	1571	# instead of getting the default action.
1487	undef $SIG{$signal}	1572	undef $SIG{$signal}
1488	unless keys %{ $SIG_CB{$signal} };	1573	unless keys %{ $SIG_CB{$signal} };
1489	};	1574	};
		1575
		1576	*_signal_exec = sub {
		1577	$HAVE_ASYNC_INTERRUPT
		1578	? $SIGPIPE_R->drain
		1579	: sysread $SIGPIPE_R, (my $dummy), 9;
		1580
		1581	while (%SIG_EV) {
		1582	for (keys %SIG_EV) {
		1583	delete $SIG_EV{$_};
		1584	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1585	}
		1586	}
		1587	};
1490	};	1588	};
1491	die if $@;	1589	die if $@;
		1590
1492	&signal	1591	&signal
1493	}	1592	}
1494		1593
1495	# default implementation for ->child	1594	# default implementation for ->child
1496		1595
1497	our %PID_CB;	1596	our %PID_CB;
1498	our $CHLD_W;	1597	our $CHLD_W;
1499	our $CHLD_DELAY_W;	1598	our $CHLD_DELAY_W;
1500	our $WNOHANG;	1599	our $WNOHANG;
1501		1600
		1601	# used by many Impl's
1502	sub _emit_childstatus($$) {	1602	sub _emit_childstatus($$) {
1503	my (undef, $rpid, $rstatus) = @_;	1603	my (undef, $rpid, $rstatus) = @_;
1504		1604
1505	$_->($rpid, $rstatus)	1605	$_->($rpid, $rstatus)
1506	for values %{ $PID_CB{$rpid} \|\| {} },	1606	for values %{ $PID_CB{$rpid} \|\| {} },
1507	values %{ $PID_CB{0} \|\| {} };	1607	values %{ $PID_CB{0} \|\| {} };
1508	}	1608	}
1509		1609
1510	sub _sigchld {
1511	my $pid;
1512
1513	AnyEvent->_emit_childstatus ($pid, $?)
1514	while ($pid = waitpid -1, $WNOHANG) > 0;
1515	}
1516
1517	sub child {	1610	sub child {
		1611	eval q{ # poor man's autoloading {}
		1612	*_sigchld = sub {
		1613	my $pid;
		1614
		1615	AnyEvent->_emit_childstatus ($pid, $?)
		1616	while ($pid = waitpid -1, $WNOHANG) > 0;
		1617	};
		1618
		1619	*child = sub {
1518	my (undef, %arg) = @_;	1620	my (undef, %arg) = @_;
1519		1621
1520	defined (my $pid = $arg{pid} + 0)	1622	defined (my $pid = $arg{pid} + 0)
1521	or Carp::croak "required option 'pid' is missing";	1623	or Carp::croak "required option 'pid' is missing";
1522		1624
1523	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1625	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1524		1626
1525	# WNOHANG is almost cetrainly 1 everywhere	1627	# WNOHANG is almost cetrainly 1 everywhere
1526	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1628	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1527	? 1	1629	? 1
1528	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1630	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1529		1631
1530	unless ($CHLD_W) {	1632	unless ($CHLD_W) {
1531	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1633	$CHLD_W = AE::signal CHLD => \&_sigchld;
1532	# child could be a zombie already, so make at least one round	1634	# child could be a zombie already, so make at least one round
1533	&_sigchld;	1635	&_sigchld;
1534	}	1636	}
1535		1637
1536	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1638	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1537	}	1639	};
1538		1640
1539	sub AnyEvent::Base::child::DESTROY {	1641	*AnyEvent::Base::child::DESTROY = sub {
1540	my ($pid, $cb) = @{$_[0]};	1642	my ($pid, $cb) = @{$_[0]};
1541		1643
1542	delete $PID_CB{$pid}{$cb};	1644	delete $PID_CB{$pid}{$cb};
1543	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1645	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1544		1646
1545	undef $CHLD_W unless keys %PID_CB;	1647	undef $CHLD_W unless keys %PID_CB;
		1648	};
		1649	};
		1650	die if $@;
		1651
		1652	&child
1546	}	1653	}
1547		1654
1548	# idle emulation is done by simply using a timer, regardless	1655	# idle emulation is done by simply using a timer, regardless
1549	# of whether the process is idle or not, and not letting	1656	# of whether the process is idle or not, and not letting
1550	# the callback use more than 50% of the time.	1657	# the callback use more than 50% of the time.
1551	sub idle {	1658	sub idle {
		1659	eval q{ # poor man's autoloading {}
		1660	*idle = sub {
1552	my (undef, %arg) = @_;	1661	my (undef, %arg) = @_;
1553		1662
1554	my ($cb, $w, $rcb) = $arg{cb};	1663	my ($cb, $w, $rcb) = $arg{cb};
1555		1664
1556	$rcb = sub {	1665	$rcb = sub {
1557	if ($cb) {	1666	if ($cb) {
1558	$w = _time;	1667	$w = _time;
1559	&$cb;	1668	&$cb;
1560	$w = _time - $w;	1669	$w = _time - $w;
1561		1670
1562	# never use more then 50% of the time for the idle watcher,	1671	# never use more then 50% of the time for the idle watcher,
1563	# within some limits	1672	# within some limits
1564	$w = 0.0001 if $w < 0.0001;	1673	$w = 0.0001 if $w < 0.0001;
1565	$w = 5 if $w > 5;	1674	$w = 5 if $w > 5;
1566		1675
1567	$w = AnyEvent->timer (after => $w, cb => $rcb);	1676	$w = AE::timer $w, 0, $rcb;
1568	} else {	1677	} else {
1569	# clean up...	1678	# clean up...
1570	undef $w;	1679	undef $w;
1571	undef $rcb;	1680	undef $rcb;
		1681	}
		1682	};
		1683
		1684	$w = AE::timer 0.05, 0, $rcb;
		1685
		1686	bless \\$cb, "AnyEvent::Base::idle"
1572	}	1687	};
		1688
		1689	*AnyEvent::Base::idle::DESTROY = sub {
		1690	undef $${$_[0]};
		1691	};
1573	};	1692	};
		1693	die if $@;
1574		1694
1575	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1695	&idle
1576
1577	bless \\$cb, "AnyEvent::Base::idle"
1578	}
1579
1580	sub AnyEvent::Base::idle::DESTROY {
1581	undef $${$_[0]};
1582	}	1696	}
1583		1697
1584	package AnyEvent::CondVar;	1698	package AnyEvent::CondVar;
1585		1699
1586	our @ISA = AnyEvent::CondVar::Base::;	1700	our @ISA = AnyEvent::CondVar::Base::;
…		…
1657	}	1771	}
1658		1772
1659	# undocumented/compatibility with pre-3.4	1773	# undocumented/compatibility with pre-3.4
1660	*broadcast = \&send;	1774	*broadcast = \&send;
1661	*wait = \&_wait;	1775	*wait = \&_wait;
1662
1663	#############################################################################
1664	# "new" API, currently only emulation of it
1665	#############################################################################
1666
1667	package AE;
1668
1669	sub io($$$) {
1670	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
1671	}
1672
1673	sub timer($$$) {
1674	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2]);
1675	}
1676
1677	sub signal($$) {
1678	AnyEvent->signal (signal => $_[0], cb => $_[1]);
1679	}
1680
1681	sub child($$) {
1682	AnyEvent->child (pid => $_[0], cb => $_[1]);
1683	}
1684
1685	sub idle($) {
1686	AnyEvent->idle (cb => $_[0]);
1687	}
1688
1689	sub cv(;&) {
1690	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
1691	}
1692
1693	sub now() {
1694	AnyEvent->now
1695	}
1696
1697	sub now_update() {
1698	AnyEvent->now_update
1699	}
1700
1701	sub time() {
1702	AnyEvent->time
1703	}
1704		1776
1705	=head1 ERROR AND EXCEPTION HANDLING	1777	=head1 ERROR AND EXCEPTION HANDLING
1706		1778
1707	In general, AnyEvent does not do any error handling - it relies on the	1779	In general, AnyEvent does not do any error handling - it relies on the
1708	caller to do that if required. The L<AnyEvent::Strict> module (see also	1780	caller to do that if required. The L<AnyEvent::Strict> module (see also
…		…
1902	warn "read: $input\n"; # output what has been read	1974	warn "read: $input\n"; # output what has been read
1903	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1975	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1904	},	1976	},
1905	);	1977	);
1906		1978
1907	my $time_watcher; # can only be used once
1908
1909	sub new_timer {
1910	$timer = AnyEvent->timer (after => 1, cb => sub {	1979	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1911	warn "timeout\n"; # print 'timeout' about every second	1980	warn "timeout\n"; # print 'timeout' at most every second
1912	&new_timer; # and restart the time
1913	});	1981	});
1914	}
1915
1916	new_timer; # create first timer
1917		1982
1918	$cv->recv; # wait until user enters /^q/i	1983	$cv->recv; # wait until user enters /^q/i
1919		1984
1920	=head1 REAL-WORLD EXAMPLE	1985	=head1 REAL-WORLD EXAMPLE
1921		1986
…		…
2052	through AnyEvent. The benchmark creates a lot of timers (with a zero	2117	through AnyEvent. The benchmark creates a lot of timers (with a zero
2053	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2118	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
2054	which it is), lets them fire exactly once and destroys them again.	2119	which it is), lets them fire exactly once and destroys them again.
2055		2120
2056	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2121	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
2057	distribution.	2122	distribution. It uses the L<AE> interface, which makes a real difference
		2123	for the EV and Perl backends only.
2058		2124
2059	=head3 Explanation of the columns	2125	=head3 Explanation of the columns
2060		2126
2061	I<watcher> is the number of event watchers created/destroyed. Since	2127	I<watcher> is the number of event watchers created/destroyed. Since
2062	different event models feature vastly different performances, each event	2128	different event models feature vastly different performances, each event
…		…
2083	watcher.	2149	watcher.
2084		2150
2085	=head3 Results	2151	=head3 Results
2086		2152
2087	name watchers bytes create invoke destroy comment	2153	name watchers bytes create invoke destroy comment
2088	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2154	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
2089	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2155	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
2090	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2156	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
2091	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2157	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
2092	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2158	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
2093	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2159	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
2094	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2160	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
2095	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2161	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
2096	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2162	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
2097	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2163	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
2098	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2164	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
2099	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2165	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2100		2166
2101	=head3 Discussion	2167	=head3 Discussion
2102		2168
2103	The benchmark does I<not> measure scalability of the event loop very	2169	The benchmark does I<not> measure scalability of the event loop very
2104	well. For example, a select-based event loop (such as the pure perl one)	2170	well. For example, a select-based event loop (such as the pure perl one)
…		…
2116	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2182	benchmark machine, handling an event takes roughly 1600 CPU cycles with
2117	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2183	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2118	cycles with POE.	2184	cycles with POE.
2119		2185
2120	C<EV> is the sole leader regarding speed and memory use, which are both	2186	C<EV> is the sole leader regarding speed and memory use, which are both
2121	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2187	maximal/minimal, respectively. When using the L<AE> API there is zero
		2188	overhead (when going through the AnyEvent API create is about 5-6 times
		2189	slower, with other times being equal, so still uses far less memory than
2122	far less memory than any other event loop and is still faster than Event	2190	any other event loop and is still faster than Event natively).
2123	natively.
2124		2191
2125	The pure perl implementation is hit in a few sweet spots (both the	2192	The pure perl implementation is hit in a few sweet spots (both the
2126	constant timeout and the use of a single fd hit optimisations in the perl	2193	constant timeout and the use of a single fd hit optimisations in the perl
2127	interpreter and the backend itself). Nevertheless this shows that it	2194	interpreter and the backend itself). Nevertheless this shows that it
2128	adds very little overhead in itself. Like any select-based backend its	2195	adds very little overhead in itself. Like any select-based backend its
…		…
2202	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2269	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2203	(1%) are active. This mirrors the activity of large servers with many	2270	(1%) are active. This mirrors the activity of large servers with many
2204	connections, most of which are idle at any one point in time.	2271	connections, most of which are idle at any one point in time.
2205		2272
2206	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2273	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2207	distribution.	2274	distribution. It uses the L<AE> interface, which makes a real difference
		2275	for the EV and Perl backends only.
2208		2276
2209	=head3 Explanation of the columns	2277	=head3 Explanation of the columns
2210		2278
2211	I<sockets> is the number of sockets, and twice the number of "servers" (as	2279	I<sockets> is the number of sockets, and twice the number of "servers" (as
2212	each server has a read and write socket end).	2280	each server has a read and write socket end).
…		…
2220	a new one that moves the timeout into the future.	2288	a new one that moves the timeout into the future.
2221		2289
2222	=head3 Results	2290	=head3 Results
2223		2291
2224	name sockets create request	2292	name sockets create request
2225	EV 20000 69.01 11.16	2293	EV 20000 62.66 7.99
2226	Perl 20000 73.32 35.87	2294	Perl 20000 68.32 32.64
2227	IOAsync 20000 157.00 98.14 epoll	2295	IOAsync 20000 174.06 101.15 epoll
2228	IOAsync 20000 159.31 616.06 poll	2296	IOAsync 20000 174.67 610.84 poll
2229	Event 20000 212.62 257.32	2297	Event 20000 202.69 242.91
2230	Glib 20000 651.16 1896.30	2298	Glib 20000 557.01 1689.52
2231	POE 20000 349.67 12317.24 uses POE::Loop::Event	2299	POE 20000 341.54 12086.32 uses POE::Loop::Event
2232		2300
2233	=head3 Discussion	2301	=head3 Discussion
2234		2302
2235	This benchmark I<does> measure scalability and overall performance of the	2303	This benchmark I<does> measure scalability and overall performance of the
2236	particular event loop.	2304	particular event loop.
…		…
2362	As you can see, the AnyEvent + EV combination even beats the	2430	As you can see, the AnyEvent + EV combination even beats the
2363	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2431	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2364	backend easily beats IO::Lambda and POE.	2432	backend easily beats IO::Lambda and POE.
2365		2433
2366	And even the 100% non-blocking version written using the high-level (and	2434	And even the 100% non-blocking version written using the high-level (and
2367	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2435	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2368	large margin, even though it does all of DNS, tcp-connect and socket I/O	2436	higher level ("unoptimised") abstractions by a large margin, even though
2369	in a non-blocking way.	2437	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2370		2438
2371	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2439	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2372	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2440	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2373	part of the IO::lambda distribution and were used without any changes.	2441	part of the IO::Lambda distribution and were used without any changes.
2374		2442
2375		2443
2376	=head1 SIGNALS	2444	=head1 SIGNALS
2377		2445
2378	AnyEvent currently installs handlers for these signals:	2446	AnyEvent currently installs handlers for these signals:
…		…
2420	it's built-in modules) are required to use it.	2488	it's built-in modules) are required to use it.
2421		2489
2422	That does not mean that AnyEvent won't take advantage of some additional	2490	That does not mean that AnyEvent won't take advantage of some additional
2423	modules if they are installed.	2491	modules if they are installed.
2424		2492
2425	This section epxlains which additional modules will be used, and how they	2493	This section explains which additional modules will be used, and how they
2426	affect AnyEvent's operetion.	2494	affect AnyEvent's operation.
2427		2495
2428	=over 4	2496	=over 4
2429		2497
2430	=item L<Async::Interrupt>	2498	=item L<Async::Interrupt>
2431		2499
…		…
2436	catch the signals) with some delay (default is 10 seconds, look for	2504	catch the signals) with some delay (default is 10 seconds, look for
2437	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2505	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2438		2506
2439	If this module is available, then it will be used to implement signal	2507	If this module is available, then it will be used to implement signal
2440	catching, which means that signals will not be delayed, and the event loop	2508	catching, which means that signals will not be delayed, and the event loop
2441	will not be interrupted regularly, which is more efficient (And good for	2509	will not be interrupted regularly, which is more efficient (and good for
2442	battery life on laptops).	2510	battery life on laptops).
2443		2511
2444	This affects not just the pure-perl event loop, but also other event loops	2512	This affects not just the pure-perl event loop, but also other event loops
2445	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2513	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2446		2514
…		…
2467	lot less memory), but otherwise doesn't affect guard operation much. It is	2535	lot less memory), but otherwise doesn't affect guard operation much. It is
2468	purely used for performance.	2536	purely used for performance.
2469		2537
2470	=item L<JSON> and L<JSON::XS>	2538	=item L<JSON> and L<JSON::XS>
2471		2539
2472	This module is required when you want to read or write JSON data via	2540	One of these modules is required when you want to read or write JSON data
2473	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2541	via L<AnyEvent::Handle>. It is also written in pure-perl, but can take
2474	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2542	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2475		2543
2476	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is	2544	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2477	installed.	2545	installed.
2478		2546
…		…
2493		2561
2494		2562
2495	=head1 FORK	2563	=head1 FORK
2496		2564
2497	Most event libraries are not fork-safe. The ones who are usually are	2565	Most event libraries are not fork-safe. The ones who are usually are
2498	because they rely on inefficient but fork-safe C<select> or C<poll>	2566	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2499	calls. Only L<EV> is fully fork-aware.	2567	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2568	are usually badly thought-out hacks that are incompatible with fork in
		2569	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2570	continue event-processing in both parent and child (or both, if you know
		2571	what you are doing).
		2572
		2573	This means that, in general, you cannot fork and do event processing in
		2574	the child if the event library was initialised before the fork (which
		2575	usually happens when the first AnyEvent watcher is created, or the library
		2576	is loaded).
2500		2577
2501	If you have to fork, you must either do so I<before> creating your first	2578	If you have to fork, you must either do so I<before> creating your first
2502	watcher OR you must not use AnyEvent at all in the child OR you must do	2579	watcher OR you must not use AnyEvent at all in the child OR you must do
2503	something completely out of the scope of AnyEvent.	2580	something completely out of the scope of AnyEvent.
		2581
		2582	The problem of doing event processing in the parent I<and> the child
		2583	is much more complicated: even for backends that I<are> fork-aware or
		2584	fork-safe, their behaviour is not usually what you want: fork clones all
		2585	watchers, that means all timers, I/O watchers etc. are active in both
		2586	parent and child, which is almost never what you want. USing C<exec>
		2587	to start worker children from some kind of manage rprocess is usually
		2588	preferred, because it is much easier and cleaner, at the expense of having
		2589	to have another binary.
2504		2590
2505		2591
2506	=head1 SECURITY CONSIDERATIONS	2592	=head1 SECURITY CONSIDERATIONS
2507		2593
2508	AnyEvent can be forced to load any event model via	2594	AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.272 by root, Thu Aug 6 13:31:01 2009 UTC vs. Revision 1.312 by root, Mon Feb 15 18:02:35 2010 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.272 by root, Thu Aug 6 13:31:01 2009 UTC vs.
Revision 1.312 by root, Mon Feb 15 18:02:35 2010 UTC