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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.253 by root, Tue Jul 21 06:00:47 2009 UTC vs.
Revision 1.301 by root, Tue Dec 1 18:04:21 2009 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - events independent of event loop implementation	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt
6	event loops.	6	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
47		47
48	There is a mailinglist for discussing all things AnyEvent, and an IRC	48	There is a mailinglist for discussing all things AnyEvent, and an IRC
49	channel, too.	49	channel, too.
50		50
51	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software	51	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software
52	Respository>, at L<http://anyevent.schmorp.de>, for more info.	52	Repository>, at L<http://anyevent.schmorp.de>, for more info.
53		53
54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)	54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
55		55
56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen	56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
57	nowadays. So what is different about AnyEvent?	57	nowadays. So what is different about AnyEvent?
…		…
181	my variables are only visible after the statement in which they are	181	my variables are only visible after the statement in which they are
182	declared.	182	declared.
183		183
184	=head2 I/O WATCHERS	184	=head2 I/O WATCHERS
185		185
		186	$w = AnyEvent->io (
		187	fh => <filehandle_or_fileno>,
		188	poll => <"r" or "w">,
		189	cb => <callback>,
		190	);
		191
186	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	192	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
187	with the following mandatory key-value pairs as arguments:	193	with the following mandatory key-value pairs as arguments:
188		194
189	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch	195	C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch
190	for events (AnyEvent might or might not keep a reference to this file	196	for events (AnyEvent might or might not keep a reference to this file
…		…
219	undef $w;	225	undef $w;
220	});	226	});
221		227
222	=head2 TIME WATCHERS	228	=head2 TIME WATCHERS
223		229
		230	$w = AnyEvent->timer (after => <seconds>, cb => <callback>);
		231
		232	$w = AnyEvent->timer (
		233	after => <fractional_seconds>,
		234	interval => <fractional_seconds>,
		235	cb => <callback>,
		236	);
		237
224	You can create a time watcher by calling the C<< AnyEvent->timer >>	238	You can create a time watcher by calling the C<< AnyEvent->timer >>
225	method with the following mandatory arguments:	239	method with the following mandatory arguments:
226		240
227	C<after> specifies after how many seconds (fractional values are	241	C<after> specifies after how many seconds (fractional values are
228	supported) the callback should be invoked. C<cb> is the callback to invoke	242	supported) the callback should be invoked. C<cb> is the callback to invoke
…		…
349	might affect timers and time-outs.	363	might affect timers and time-outs.
350		364
351	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
352	event loop's idea of "current time".	366	event loop's idea of "current time".
353		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
354	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.
355		376
356	=back	377	=back
357		378
358	=head2 SIGNAL WATCHERS	379	=head2 SIGNAL WATCHERS
		380
		381	$w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>);
359		382
360	You can watch for signals using a signal watcher, C<signal> is the signal	383	You can watch for signals using a signal watcher, C<signal> is the signal
361	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl	384	I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl
362	callback to be invoked whenever a signal occurs.	385	callback to be invoked whenever a signal occurs.
363		386
…		…
380		403
381	Example: exit on SIGINT	404	Example: exit on SIGINT
382		405
383	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	406	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
384		407
		408	=head3 Restart Behaviour
		409
		410	While restart behaviour is up to the event loop implementation, most will
		411	not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's
		412	pure perl implementation).
		413
		414	=head3 Safe/Unsafe Signals
		415
		416	Perl signals can be either "safe" (synchronous to opcode handling) or
		417	"unsafe" (asynchronous) - the former might get delayed indefinitely, the
		418	latter might corrupt your memory.
		419
		420	AnyEvent signal handlers are, in addition, synchronous to the event loop,
		421	i.e. they will not interrupt your running perl program but will only be
		422	called as part of the normal event handling (just like timer, I/O etc.
		423	callbacks, too).
		424
385	=head3 Signal Races, Delays and Workarounds	425	=head3 Signal Races, Delays and Workarounds
386		426
387	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching	427	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
388	callbacks to signals in a generic way, which is a pity, as you cannot do	428	callbacks to signals in a generic way, which is a pity, as you cannot
389	race-free signal handling in perl. AnyEvent will try to do it's best, but	429	do race-free signal handling in perl, requiring C libraries for
		430	this. AnyEvent will try to do it's best, which means in some cases,
390	in some cases, signals will be delayed. The maximum time a signal might	431	signals will be delayed. The maximum time a signal might be delayed is
391	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10	432	specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This
392	seconds). This variable can be changed only before the first signal	433	variable can be changed only before the first signal watcher is created,
393	watcher is created, and should be left alone otherwise. Higher values	434	and should be left alone otherwise. This variable determines how often
		435	AnyEvent polls for signals (in case a wake-up was missed). Higher values
394	will cause fewer spurious wake-ups, which is better for power and CPU	436	will cause fewer spurious wake-ups, which is better for power and CPU
		437	saving.
		438
395	saving. All these problems can be avoided by installing the optional	439	All these problems can be avoided by installing the optional
396	L<Async::Interrupt> module. This will not work with inherently broken	440	L<Async::Interrupt> module, which works with most event loops. It will not
397	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>	441	work with inherently broken event loops such as L<Event> or L<Event::Lib>
398	currently, as POE does it's own workaround with one-second latency). With	442	(and not with L<POE> currently, as POE does it's own workaround with
399	those, you just have to suffer the delays.	443	one-second latency). For those, you just have to suffer the delays.
400		444
401	=head2 CHILD PROCESS WATCHERS	445	=head2 CHILD PROCESS WATCHERS
402		446
		447	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
		448
403	You can also watch on a child process exit and catch its exit status.	449	You can also watch on a child process exit and catch its exit status.
404		450
405	The child process is specified by the C<pid> argument (if set to C<0>, it	451	The child process is specified by the C<pid> argument (one some backends,
406	watches for any child process exit). The watcher will triggered only when	452	using C<0> watches for any child process exit, on others this will
407	the child process has finished and an exit status is available, not on	453	croak). The watcher will be triggered only when the child process has
408	any trace events (stopped/continued).	454	finished and an exit status is available, not on any trace events
		455	(stopped/continued).
409		456
410	The callback will be called with the pid and exit status (as returned by	457	The callback will be called with the pid and exit status (as returned by
411	waitpid), so unlike other watcher types, you I<can> rely on child watcher	458	waitpid), so unlike other watcher types, you I<can> rely on child watcher
412	callback arguments.	459	callback arguments.
413		460
…		…
454	# do something else, then wait for process exit	501	# do something else, then wait for process exit
455	$done->recv;	502	$done->recv;
456		503
457	=head2 IDLE WATCHERS	504	=head2 IDLE WATCHERS
458		505
		506	$w = AnyEvent->idle (cb => <callback>);
		507
459	Sometimes there is a need to do something, but it is not so important	508	Sometimes there is a need to do something, but it is not so important
460	to do it instantly, but only when there is nothing better to do. This	509	to do it instantly, but only when there is nothing better to do. This
461	"nothing better to do" is usually defined to be "no other events need	510	"nothing better to do" is usually defined to be "no other events need
462	attention by the event loop".	511	attention by the event loop".
463		512
…		…
489	});	538	});
490	});	539	});
491		540
492	=head2 CONDITION VARIABLES	541	=head2 CONDITION VARIABLES
493		542
		543	$cv = AnyEvent->condvar;
		544
		545	$cv->send (<list>);
		546	my @res = $cv->recv;
		547
494	If you are familiar with some event loops you will know that all of them	548	If you are familiar with some event loops you will know that all of them
495	require you to run some blocking "loop", "run" or similar function that	549	require you to run some blocking "loop", "run" or similar function that
496	will actively watch for new events and call your callbacks.	550	will actively watch for new events and call your callbacks.
497		551
498	AnyEvent is slightly different: it expects somebody else to run the event	552	AnyEvent is slightly different: it expects somebody else to run the event
…		…
562	after => 1,	616	after => 1,
563	cb => sub { $result_ready->send },	617	cb => sub { $result_ready->send },
564	);	618	);
565		619
566	# this "blocks" (while handling events) till the callback	620	# this "blocks" (while handling events) till the callback
567	# calls -<send	621	# calls ->send
568	$result_ready->recv;	622	$result_ready->recv;
569		623
570	Example: wait for a timer, but take advantage of the fact that condition	624	Example: wait for a timer, but take advantage of the fact that condition
571	variables are also callable directly.	625	variables are also callable directly.
572		626
…		…
636	one. For example, a function that pings many hosts in parallel might want	690	one. For example, a function that pings many hosts in parallel might want
637	to use a condition variable for the whole process.	691	to use a condition variable for the whole process.
638		692
639	Every call to C<< ->begin >> will increment a counter, and every call to	693	Every call to C<< ->begin >> will increment a counter, and every call to
640	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	694	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
641	>>, the (last) callback passed to C<begin> will be executed. That callback	695	>>, the (last) callback passed to C<begin> will be executed, passing the
642	is I<supposed> to call C<< ->send >>, but that is not required. If no	696	condvar as first argument. That callback is I<supposed> to call C<< ->send
643	callback was set, C<send> will be called without any arguments.	697	>>, but that is not required. If no group callback was set, C<send> will
		698	be called without any arguments.
644		699
645	You can think of C<< $cv->send >> giving you an OR condition (one call	700	You can think of C<< $cv->send >> giving you an OR condition (one call
646	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	701	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
647	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	702	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
648		703
…		…
675	begung can potentially be zero:	730	begung can potentially be zero:
676		731
677	my $cv = AnyEvent->condvar;	732	my $cv = AnyEvent->condvar;
678		733
679	my %result;	734	my %result;
680	$cv->begin (sub { $cv->send (\%result) });	735	$cv->begin (sub { shift->send (\%result) });
681		736
682	for my $host (@list_of_hosts) {	737	for my $host (@list_of_hosts) {
683	$cv->begin;	738	$cv->begin;
684	ping_host_then_call_callback $host, sub {	739	ping_host_then_call_callback $host, sub {
685	$result{$host} = ...;	740	$result{$host} = ...;
…		…
760	=item $cb = $cv->cb ($cb->($cv))	815	=item $cb = $cv->cb ($cb->($cv))
761		816
762	This is a mutator function that returns the callback set and optionally	817	This is a mutator function that returns the callback set and optionally
763	replaces it before doing so.	818	replaces it before doing so.
764		819
765	The callback will be called when the condition becomes "true", i.e. when	820	The callback will be called when the condition becomes (or already was)
766	C<send> or C<croak> are called, with the only argument being the condition	821	"true", i.e. when C<send> or C<croak> are called (or were called), with
767	variable itself. Calling C<recv> inside the callback or at any later time	822	the only argument being the condition variable itself. Calling C<recv>
768	is guaranteed not to block.	823	inside the callback or at any later time is guaranteed not to block.
769		824
770	=back	825	=back
771		826
772	=head1 SUPPORTED EVENT LOOPS/BACKENDS	827	=head1 SUPPORTED EVENT LOOPS/BACKENDS
773		828
…		…
776	=over 4	831	=over 4
777		832
778	=item Backends that are autoprobed when no other event loop can be found.	833	=item Backends that are autoprobed when no other event loop can be found.
779		834
780	EV is the preferred backend when no other event loop seems to be in	835	EV is the preferred backend when no other event loop seems to be in
781	use. If EV is not installed, then AnyEvent will try Event, and, failing	836	use. If EV is not installed, then AnyEvent will fall back to its own
782	that, will fall back to its own pure-perl implementation, which is	837	pure-perl implementation, which is available everywhere as it comes with
783	available everywhere as it comes with AnyEvent itself.	838	AnyEvent itself.
784		839
785	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	840	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
786	AnyEvent::Impl::Event based on Event, very stable, few glitches.
787	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	841	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
788		842
789	=item Backends that are transparently being picked up when they are used.	843	=item Backends that are transparently being picked up when they are used.
790		844
791	These will be used when they are currently loaded when the first watcher	845	These will be used when they are currently loaded when the first watcher
792	is created, in which case it is assumed that the application is using	846	is created, in which case it is assumed that the application is using
793	them. This means that AnyEvent will automatically pick the right backend	847	them. This means that AnyEvent will automatically pick the right backend
794	when the main program loads an event module before anything starts to	848	when the main program loads an event module before anything starts to
795	create watchers. Nothing special needs to be done by the main program.	849	create watchers. Nothing special needs to be done by the main program.
796		850
		851	AnyEvent::Impl::Event based on Event, very stable, few glitches.
797	AnyEvent::Impl::Glib based on Glib, slow but very stable.	852	AnyEvent::Impl::Glib based on Glib, slow but very stable.
798	AnyEvent::Impl::Tk based on Tk, very broken.	853	AnyEvent::Impl::Tk based on Tk, very broken.
799	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	854	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
800	AnyEvent::Impl::POE based on POE, very slow, some limitations.	855	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		856	AnyEvent::Impl::Irssi used when running within irssi.
801		857
802	=item Backends with special needs.	858	=item Backends with special needs.
803		859
804	Qt requires the Qt::Application to be instantiated first, but will	860	Qt requires the Qt::Application to be instantiated first, but will
805	otherwise be picked up automatically. As long as the main program	861	otherwise be picked up automatically. As long as the main program
…		…
1074		1130
1075	package AnyEvent;	1131	package AnyEvent;
1076		1132
1077	# basically a tuned-down version of common::sense	1133	# basically a tuned-down version of common::sense
1078	sub common_sense {	1134	sub common_sense {
1079	# no warnings	1135	# from common:.sense 1.0
1080	${^WARNING_BITS} ^= ${^WARNING_BITS};	1136	${^WARNING_BITS} = "\xfc\x3f\xf3\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x03";
1081	# use strict vars subs	1137	# use strict vars subs
1082	$^H \|= 0x00000600;	1138	$^H \|= 0x00000600;
1083	}	1139	}
1084		1140
1085	BEGIN { AnyEvent::common_sense }	1141	BEGIN { AnyEvent::common_sense }
1086		1142
1087	use Carp ();	1143	use Carp ();
1088		1144
1089	our $VERSION = 4.86;	1145	our $VERSION = '5.21';
1090	our $MODEL;	1146	our $MODEL;
1091		1147
1092	our $AUTOLOAD;	1148	our $AUTOLOAD;
1093	our @ISA;	1149	our @ISA;
1094		1150
1095	our @REGISTRY;	1151	our @REGISTRY;
1096
1097	our $WIN32;
1098		1152
1099	our $VERBOSE;	1153	our $VERBOSE;
1100		1154
1101	BEGIN {	1155	BEGIN {
1102	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1156	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
…		…
1119	for reverse split /\s,\s/,	1173	for reverse split /\s,\s/,
1120	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1174	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1121	}	1175	}
1122		1176
1123	my @models = (	1177	my @models = (
1124	[EV:: => AnyEvent::Impl::EV::],	1178	[EV:: => AnyEvent::Impl::EV:: , 1],
1125	[Event:: => AnyEvent::Impl::Event::],
1126	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1179	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1127	# everything below here will not be autoprobed	1180	# everything below here will not (normally) be autoprobed
1128	# as the pureperl backend should work everywhere	1181	# as the pureperl backend should work everywhere
1129	# and is usually faster	1182	# and is usually faster
		1183	[Event:: => AnyEvent::Impl::Event::, 1],
1130	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1184	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1131	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1185	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1186	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1132	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1187	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1133	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1188	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1134	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1189	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1135	[Wx:: => AnyEvent::Impl::POE::],	1190	[Wx:: => AnyEvent::Impl::POE::],
1136	[Prima:: => AnyEvent::Impl::POE::],	1191	[Prima:: => AnyEvent::Impl::POE::],
1137	# IO::Async is just too broken - we would need workarounds for its	1192	# IO::Async is just too broken - we would need workarounds for its
1138	# byzantine signal and broken child handling, among others.	1193	# byzantine signal and broken child handling, among others.
1139	# IO::Async is rather hard to detect, as it doesn't have any	1194	# IO::Async is rather hard to detect, as it doesn't have any
1140	# obvious default class.	1195	# obvious default class.
1141	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1196	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1142	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1197	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1143	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1198	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1199	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1144	);	1200	);
1145		1201
1146	our %method = map +($_ => 1),	1202	our %method = map +($_ => 1),
1147	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1203	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1148		1204
…		…
1194	}	1250	}
1195	}	1251	}
1196	}	1252	}
1197		1253
1198	unless ($MODEL) {	1254	unless ($MODEL) {
1199	# try to load a model	1255	# try to autoload a model
1200
1201	for (@REGISTRY, @models) {	1256	for (@REGISTRY, @models) {
1202	my ($package, $model) = @$_;	1257	my ($package, $model, $autoload) = @$_;
		1258	if (
		1259	$autoload
1203	if (eval "require $package"	1260	and eval "require $package"
1204	and ${"$package\::VERSION"} > 0	1261	and ${"$package\::VERSION"} > 0
1205	and eval "require $model") {	1262	and eval "require $model"
		1263	) {
1206	$MODEL = $model;	1264	$MODEL = $model;
1207	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;	1265	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1208	last;	1266	last;
1209	}	1267	}
1210	}	1268	}
1211		1269
1212	$MODEL	1270	$MODEL
…		…
1253	# we assume CLOEXEC is already set by perl in all important cases	1311	# we assume CLOEXEC is already set by perl in all important cases
1254		1312
1255	($fh2, $rw)	1313	($fh2, $rw)
1256	}	1314	}
1257		1315
		1316	=head1 SIMPLIFIED AE API
		1317
		1318	Starting with version 5.0, AnyEvent officially supports a second, much
		1319	simpler, API that is designed to reduce the calling, typing and memory
		1320	overhead.
		1321
		1322	See the L<AE> manpage for details.
		1323
		1324	=cut
		1325
		1326	package AE;
		1327
		1328	our $VERSION = $AnyEvent::VERSION;
		1329
		1330	sub io($$$) {
		1331	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1332	}
		1333
		1334	sub timer($$$) {
		1335	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1336	}
		1337
		1338	sub signal($$) {
		1339	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1340	}
		1341
		1342	sub child($$) {
		1343	AnyEvent->child (pid => $_[0], cb => $_[1])
		1344	}
		1345
		1346	sub idle($) {
		1347	AnyEvent->idle (cb => $_[0])
		1348	}
		1349
		1350	sub cv(;&) {
		1351	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1352	}
		1353
		1354	sub now() {
		1355	AnyEvent->now
		1356	}
		1357
		1358	sub now_update() {
		1359	AnyEvent->now_update
		1360	}
		1361
		1362	sub time() {
		1363	AnyEvent->time
		1364	}
		1365
1258	package AnyEvent::Base;	1366	package AnyEvent::Base;
1259		1367
1260	# default implementations for many methods	1368	# default implementations for many methods
1261		1369
1262	sub _time {	1370	sub _time() {
1263	# probe for availability of Time::HiRes	1371	# probe for availability of Time::HiRes
1264	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1372	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1265	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1373	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1266	*_time = \&Time::HiRes::time;	1374	*_time = \&Time::HiRes::time;
1267	# if (eval "use POSIX (); (POSIX::times())...	1375	# if (eval "use POSIX (); (POSIX::times())...
…		…
1284	}	1392	}
1285		1393
1286	# default implementation for ->signal	1394	# default implementation for ->signal
1287		1395
1288	our $HAVE_ASYNC_INTERRUPT;	1396	our $HAVE_ASYNC_INTERRUPT;
		1397
		1398	sub _have_async_interrupt() {
		1399	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1400	&& eval "use Async::Interrupt 1.02 (); 1")
		1401	unless defined $HAVE_ASYNC_INTERRUPT;
		1402
		1403	$HAVE_ASYNC_INTERRUPT
		1404	}
		1405
1289	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1406	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1290	our (%SIG_ASY, %SIG_ASY_W);	1407	our (%SIG_ASY, %SIG_ASY_W);
1291	our ($SIG_COUNT, $SIG_TW);	1408	our ($SIG_COUNT, $SIG_TW);
1292		1409
1293	sub _signal_exec {	1410	sub _signal_exec {
1294	$HAVE_ASYNC_INTERRUPT	1411	$HAVE_ASYNC_INTERRUPT
1295	? $SIGPIPE_R->drain	1412	? $SIGPIPE_R->drain
1296	: sysread $SIGPIPE_R, my $dummy, 9;	1413	: sysread $SIGPIPE_R, (my $dummy), 9;
1297		1414
1298	while (%SIG_EV) {	1415	while (%SIG_EV) {
1299	for (keys %SIG_EV) {	1416	for (keys %SIG_EV) {
1300	delete $SIG_EV{$_};	1417	delete $SIG_EV{$_};
1301	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1418	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1302	}	1419	}
1303	}	1420	}
1304	}	1421	}
1305		1422
1306	# install a dumym wakeupw atcher to reduce signal catching latency	1423	# install a dummy wakeup watcher to reduce signal catching latency
1307	sub _sig_add() {	1424	sub _sig_add() {
1308	unless ($SIG_COUNT++) {	1425	unless ($SIG_COUNT++) {
1309	# try to align timer on a full-second boundary, if possible	1426	# try to align timer on a full-second boundary, if possible
1310	my $NOW = AnyEvent->now;	1427	my $NOW = AE::now;
1311		1428
1312	$SIG_TW = AnyEvent->timer (	1429	$SIG_TW = AE::timer
1313	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1430	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1314	interval => $MAX_SIGNAL_LATENCY,	1431	$MAX_SIGNAL_LATENCY,
1315	cb => sub { }, # just for the PERL_ASYNC_CHECK	1432	sub { } # just for the PERL_ASYNC_CHECK
1316	);	1433	;
1317	}	1434	}
1318	}	1435	}
1319		1436
1320	sub _sig_del {	1437	sub _sig_del {
1321	undef $SIG_TW	1438	undef $SIG_TW
1322	unless --$SIG_COUNT;	1439	unless --$SIG_COUNT;
1323	}	1440	}
1324		1441
		1442	our $_sig_name_init; $_sig_name_init = sub {
		1443	eval q{ # poor man's autoloading
		1444	undef $_sig_name_init;
		1445
		1446	if (_have_async_interrupt) {
		1447	*sig2num = \&Async::Interrupt::sig2num;
		1448	*sig2name = \&Async::Interrupt::sig2name;
		1449	} else {
		1450	require Config;
		1451
		1452	my %signame2num;
		1453	@signame2num{ split ' ', $Config::Config{sig_name} }
		1454	= split ' ', $Config::Config{sig_num};
		1455
		1456	my @signum2name;
		1457	@signum2name[values %signame2num] = keys %signame2num;
		1458
		1459	*sig2num = sub($) {
		1460	$_[0] > 0 ? shift : $signame2num{+shift}
		1461	};
		1462	*sig2name = sub ($) {
		1463	$_[0] > 0 ? $signum2name[+shift] : shift
		1464	};
		1465	}
		1466	};
		1467	die if $@;
		1468	};
		1469
		1470	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1471	sub sig2name($) { &$_sig_name_init; &sig2name }
		1472
1325	sub _signal {	1473	sub signal {
		1474	eval q{ # poor man's autoloading {}
		1475	# probe for availability of Async::Interrupt
		1476	if (_have_async_interrupt) {
		1477	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
		1478
		1479	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1480	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
		1481
		1482	} else {
		1483	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1484
		1485	require Fcntl;
		1486
		1487	if (AnyEvent::WIN32) {
		1488	require AnyEvent::Util;
		1489
		1490	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1491	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1492	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1493	} else {
		1494	pipe $SIGPIPE_R, $SIGPIPE_W;
		1495	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
		1496	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1497
		1498	# not strictly required, as $^F is normally 2, but let's make sure...
		1499	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1500	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1501	}
		1502
		1503	$SIGPIPE_R
		1504	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1505
		1506	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1507	}
		1508
		1509	*signal = sub {
1326	my (undef, %arg) = @_;	1510	my (undef, %arg) = @_;
1327		1511
1328	my $signal = uc $arg{signal}	1512	my $signal = uc $arg{signal}
1329	or Carp::croak "required option 'signal' is missing";	1513	or Carp::croak "required option 'signal' is missing";
1330		1514
1331	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1332
1333	if ($HAVE_ASYNC_INTERRUPT) {	1515	if ($HAVE_ASYNC_INTERRUPT) {
1334	# async::interrupt	1516	# async::interrupt
1335		1517
1336	$SIG_ASY{$signal} \|\|= do {	1518	$signal = sig2num $signal;
1337	my $asy = new Async::Interrupt	1519	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1520
		1521	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1338	cb => sub { undef $SIG_EV{$signal} },	1522	cb => sub { undef $SIG_EV{$signal} },
1339	signal => $signal,	1523	signal => $signal,
1340	pipe => [$SIGPIPE_R->filenos],	1524	pipe => [$SIGPIPE_R->filenos],
		1525	pipe_autodrain => 0,
		1526	;
		1527
		1528	} else {
		1529	# pure perl
		1530
		1531	# AE::Util has been loaded in signal
		1532	$signal = sig2name $signal;
		1533	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1534
		1535	$SIG{$signal} \|\|= sub {
		1536	local $!;
		1537	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1538	undef $SIG_EV{$signal};
		1539	};
		1540
		1541	# can't do signal processing without introducing races in pure perl,
		1542	# so limit the signal latency.
		1543	_sig_add;
1341	;	1544	}
1342	$asy->pipe_autodrain (0);
1343		1545
1344	$asy	1546	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1345	};	1547	};
1346		1548
1347	} else {	1549	*AnyEvent::Base::signal::DESTROY = sub {
1348	# pure perl	1550	my ($signal, $cb) = @{$_[0]};
1349		1551
1350	$SIG{$signal} \|\|= sub {	1552	_sig_del;
1351	local $!;	1553
1352	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1554	delete $SIG_CB{$signal}{$cb};
		1555
		1556	$HAVE_ASYNC_INTERRUPT
		1557	? delete $SIG_ASY{$signal}
		1558	: # delete doesn't work with older perls - they then
		1559	# print weird messages, or just unconditionally exit
		1560	# instead of getting the default action.
1353	undef $SIG_EV{$signal};	1561	undef $SIG{$signal}
		1562	unless keys %{ $SIG_CB{$signal} };
1354	};	1563	};
1355
1356	# can't do signal processing without introducing races in pure perl,
1357	# so limit the signal latency.
1358	_sig_add;
1359	}	1564	};
1360		1565	die if $@;
1361	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1362	}
1363
1364	sub signal {
1365	# probe for availability of Async::Interrupt
1366	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
1367	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1368
1369	$HAVE_ASYNC_INTERRUPT = 1;
1370	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1371	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
1372
1373	} else {
1374	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1375
1376	require Fcntl;
1377
1378	if (AnyEvent::WIN32) {
1379	require AnyEvent::Util;
1380
1381	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1382	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1383	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1384	} else {
1385	pipe $SIGPIPE_R, $SIGPIPE_W;
1386	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1387	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1388
1389	# not strictly required, as $^F is normally 2, but let's make sure...
1390	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1391	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1392	}
1393
1394	$SIGPIPE_R
1395	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1396
1397	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1398	}
1399
1400	*signal = \&_signal;
1401	&signal	1566	&signal
1402	}
1403
1404	sub AnyEvent::Base::signal::DESTROY {
1405	my ($signal, $cb) = @{$_[0]};
1406
1407	_sig_del;
1408
1409	delete $SIG_CB{$signal}{$cb};
1410
1411	$HAVE_ASYNC_INTERRUPT
1412	? delete $SIG_ASY{$signal}
1413	: # delete doesn't work with older perls - they then
1414	# print weird messages, or just unconditionally exit
1415	# instead of getting the default action.
1416	undef $SIG{$signal}
1417	unless keys %{ $SIG_CB{$signal} };
1418	}	1567	}
1419		1568
1420	# default implementation for ->child	1569	# default implementation for ->child
1421		1570
1422	our %PID_CB;	1571	our %PID_CB;
1423	our $CHLD_W;	1572	our $CHLD_W;
1424	our $CHLD_DELAY_W;	1573	our $CHLD_DELAY_W;
1425	our $WNOHANG;	1574	our $WNOHANG;
1426		1575
		1576	sub _emit_childstatus($$) {
		1577	my (undef, $rpid, $rstatus) = @_;
		1578
		1579	$_->($rpid, $rstatus)
		1580	for values %{ $PID_CB{$rpid} \|\| {} },
		1581	values %{ $PID_CB{0} \|\| {} };
		1582	}
		1583
1427	sub _sigchld {	1584	sub _sigchld {
		1585	my $pid;
		1586
		1587	AnyEvent->_emit_childstatus ($pid, $?)
1428	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1588	while ($pid = waitpid -1, $WNOHANG) > 0;
1429	$_->($pid, $?)
1430	for values %{ $PID_CB{$pid} \|\| {} },
1431	values %{ $PID_CB{0} \|\| {} };
1432	}
1433	}	1589	}
1434		1590
1435	sub child {	1591	sub child {
1436	my (undef, %arg) = @_;	1592	my (undef, %arg) = @_;
1437		1593
…		…
1444	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1600	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1445	? 1	1601	? 1
1446	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1602	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1447		1603
1448	unless ($CHLD_W) {	1604	unless ($CHLD_W) {
1449	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1605	$CHLD_W = AE::signal CHLD => \&_sigchld;
1450	# child could be a zombie already, so make at least one round	1606	# child could be a zombie already, so make at least one round
1451	&_sigchld;	1607	&_sigchld;
1452	}	1608	}
1453		1609
1454	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1610	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
…		…
1480	# never use more then 50% of the time for the idle watcher,	1636	# never use more then 50% of the time for the idle watcher,
1481	# within some limits	1637	# within some limits
1482	$w = 0.0001 if $w < 0.0001;	1638	$w = 0.0001 if $w < 0.0001;
1483	$w = 5 if $w > 5;	1639	$w = 5 if $w > 5;
1484		1640
1485	$w = AnyEvent->timer (after => $w, cb => $rcb);	1641	$w = AE::timer $w, 0, $rcb;
1486	} else {	1642	} else {
1487	# clean up...	1643	# clean up...
1488	undef $w;	1644	undef $w;
1489	undef $rcb;	1645	undef $rcb;
1490	}	1646	}
1491	};	1647	};
1492		1648
1493	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1649	$w = AE::timer 0.05, 0, $rcb;
1494		1650
1495	bless \\$cb, "AnyEvent::Base::idle"	1651	bless \\$cb, "AnyEvent::Base::idle"
1496	}	1652	}
1497		1653
1498	sub AnyEvent::Base::idle::DESTROY {	1654	sub AnyEvent::Base::idle::DESTROY {
…		…
1552	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1708	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1553	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1709	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1554	}	1710	}
1555		1711
1556	sub cb {	1712	sub cb {
1557	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1713	my $cv = shift;
		1714
		1715	@_
		1716	and $cv->{_ae_cb} = shift
		1717	and $cv->{_ae_sent}
		1718	and (delete $cv->{_ae_cb})->($cv);
		1719
1558	$_[0]{_ae_cb}	1720	$cv->{_ae_cb}
1559	}	1721	}
1560		1722
1561	sub begin {	1723	sub begin {
1562	++$_[0]{_ae_counter};	1724	++$_[0]{_ae_counter};
1563	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1725	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1772	warn "read: $input\n"; # output what has been read	1934	warn "read: $input\n"; # output what has been read
1773	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1935	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1774	},	1936	},
1775	);	1937	);
1776		1938
1777	my $time_watcher; # can only be used once
1778
1779	sub new_timer {
1780	$timer = AnyEvent->timer (after => 1, cb => sub {	1939	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1781	warn "timeout\n"; # print 'timeout' about every second	1940	warn "timeout\n"; # print 'timeout' at most every second
1782	&new_timer; # and restart the time
1783	});	1941	});
1784	}
1785
1786	new_timer; # create first timer
1787		1942
1788	$cv->recv; # wait until user enters /^q/i	1943	$cv->recv; # wait until user enters /^q/i
1789		1944
1790	=head1 REAL-WORLD EXAMPLE	1945	=head1 REAL-WORLD EXAMPLE
1791		1946
…		…
1922	through AnyEvent. The benchmark creates a lot of timers (with a zero	2077	through AnyEvent. The benchmark creates a lot of timers (with a zero
1923	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2078	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
1924	which it is), lets them fire exactly once and destroys them again.	2079	which it is), lets them fire exactly once and destroys them again.
1925		2080
1926	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2081	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1927	distribution.	2082	distribution. It uses the L<AE> interface, which makes a real difference
		2083	for the EV and Perl backends only.
1928		2084
1929	=head3 Explanation of the columns	2085	=head3 Explanation of the columns
1930		2086
1931	I<watcher> is the number of event watchers created/destroyed. Since	2087	I<watcher> is the number of event watchers created/destroyed. Since
1932	different event models feature vastly different performances, each event	2088	different event models feature vastly different performances, each event
…		…
1953	watcher.	2109	watcher.
1954		2110
1955	=head3 Results	2111	=head3 Results
1956		2112
1957	name watchers bytes create invoke destroy comment	2113	name watchers bytes create invoke destroy comment
1958	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2114	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
1959	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2115	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
1960	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2116	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
1961	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2117	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
1962	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2118	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
1963	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2119	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
1964	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2120	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
1965	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2121	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
1966	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2122	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
1967	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2123	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
1968	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2124	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
1969	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2125	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
1970		2126
1971	=head3 Discussion	2127	=head3 Discussion
1972		2128
1973	The benchmark does I<not> measure scalability of the event loop very	2129	The benchmark does I<not> measure scalability of the event loop very
1974	well. For example, a select-based event loop (such as the pure perl one)	2130	well. For example, a select-based event loop (such as the pure perl one)
…		…
1986	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2142	benchmark machine, handling an event takes roughly 1600 CPU cycles with
1987	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2143	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
1988	cycles with POE.	2144	cycles with POE.
1989		2145
1990	C<EV> is the sole leader regarding speed and memory use, which are both	2146	C<EV> is the sole leader regarding speed and memory use, which are both
1991	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2147	maximal/minimal, respectively. When using the L<AE> API there is zero
		2148	overhead (when going through the AnyEvent API create is about 5-6 times
		2149	slower, with other times being equal, so still uses far less memory than
1992	far less memory than any other event loop and is still faster than Event	2150	any other event loop and is still faster than Event natively).
1993	natively.
1994		2151
1995	The pure perl implementation is hit in a few sweet spots (both the	2152	The pure perl implementation is hit in a few sweet spots (both the
1996	constant timeout and the use of a single fd hit optimisations in the perl	2153	constant timeout and the use of a single fd hit optimisations in the perl
1997	interpreter and the backend itself). Nevertheless this shows that it	2154	interpreter and the backend itself). Nevertheless this shows that it
1998	adds very little overhead in itself. Like any select-based backend its	2155	adds very little overhead in itself. Like any select-based backend its
…		…
2072	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2229	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2073	(1%) are active. This mirrors the activity of large servers with many	2230	(1%) are active. This mirrors the activity of large servers with many
2074	connections, most of which are idle at any one point in time.	2231	connections, most of which are idle at any one point in time.
2075		2232
2076	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2233	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2077	distribution.	2234	distribution. It uses the L<AE> interface, which makes a real difference
		2235	for the EV and Perl backends only.
2078		2236
2079	=head3 Explanation of the columns	2237	=head3 Explanation of the columns
2080		2238
2081	I<sockets> is the number of sockets, and twice the number of "servers" (as	2239	I<sockets> is the number of sockets, and twice the number of "servers" (as
2082	each server has a read and write socket end).	2240	each server has a read and write socket end).
…		…
2090	a new one that moves the timeout into the future.	2248	a new one that moves the timeout into the future.
2091		2249
2092	=head3 Results	2250	=head3 Results
2093		2251
2094	name sockets create request	2252	name sockets create request
2095	EV 20000 69.01 11.16	2253	EV 20000 62.66 7.99
2096	Perl 20000 73.32 35.87	2254	Perl 20000 68.32 32.64
2097	IOAsync 20000 157.00 98.14 epoll	2255	IOAsync 20000 174.06 101.15 epoll
2098	IOAsync 20000 159.31 616.06 poll	2256	IOAsync 20000 174.67 610.84 poll
2099	Event 20000 212.62 257.32	2257	Event 20000 202.69 242.91
2100	Glib 20000 651.16 1896.30	2258	Glib 20000 557.01 1689.52
2101	POE 20000 349.67 12317.24 uses POE::Loop::Event	2259	POE 20000 341.54 12086.32 uses POE::Loop::Event
2102		2260
2103	=head3 Discussion	2261	=head3 Discussion
2104		2262
2105	This benchmark I<does> measure scalability and overall performance of the	2263	This benchmark I<does> measure scalability and overall performance of the
2106	particular event loop.	2264	particular event loop.
…		…
2232	As you can see, the AnyEvent + EV combination even beats the	2390	As you can see, the AnyEvent + EV combination even beats the
2233	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2391	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2234	backend easily beats IO::Lambda and POE.	2392	backend easily beats IO::Lambda and POE.
2235		2393
2236	And even the 100% non-blocking version written using the high-level (and	2394	And even the 100% non-blocking version written using the high-level (and
2237	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2395	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2238	large margin, even though it does all of DNS, tcp-connect and socket I/O	2396	higher level ("unoptimised") abstractions by a large margin, even though
2239	in a non-blocking way.	2397	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2240		2398
2241	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2399	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2242	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2400	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2243	part of the IO::lambda distribution and were used without any changes.	2401	part of the IO::Lambda distribution and were used without any changes.
2244		2402
2245		2403
2246	=head1 SIGNALS	2404	=head1 SIGNALS
2247		2405
2248	AnyEvent currently installs handlers for these signals:	2406	AnyEvent currently installs handlers for these signals:
…		…
2290	it's built-in modules) are required to use it.	2448	it's built-in modules) are required to use it.
2291		2449
2292	That does not mean that AnyEvent won't take advantage of some additional	2450	That does not mean that AnyEvent won't take advantage of some additional
2293	modules if they are installed.	2451	modules if they are installed.
2294		2452
2295	This section epxlains which additional modules will be used, and how they	2453	This section explains which additional modules will be used, and how they
2296	affect AnyEvent's operetion.	2454	affect AnyEvent's operation.
2297		2455
2298	=over 4	2456	=over 4
2299		2457
2300	=item L<Async::Interrupt>	2458	=item L<Async::Interrupt>
2301		2459
…		…
2306	catch the signals) with some delay (default is 10 seconds, look for	2464	catch the signals) with some delay (default is 10 seconds, look for
2307	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2465	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2308		2466
2309	If this module is available, then it will be used to implement signal	2467	If this module is available, then it will be used to implement signal
2310	catching, which means that signals will not be delayed, and the event loop	2468	catching, which means that signals will not be delayed, and the event loop
2311	will not be interrupted regularly, which is more efficient (And good for	2469	will not be interrupted regularly, which is more efficient (and good for
2312	battery life on laptops).	2470	battery life on laptops).
2313		2471
2314	This affects not just the pure-perl event loop, but also other event loops	2472	This affects not just the pure-perl event loop, but also other event loops
2315	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2473	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2316		2474
…		…
2337	lot less memory), but otherwise doesn't affect guard operation much. It is	2495	lot less memory), but otherwise doesn't affect guard operation much. It is
2338	purely used for performance.	2496	purely used for performance.
2339		2497
2340	=item L<JSON> and L<JSON::XS>	2498	=item L<JSON> and L<JSON::XS>
2341		2499
2342	This module is required when you want to read or write JSON data via	2500	One of these modules is required when you want to read or write JSON data
2343	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2501	via L<AnyEvent::Handle>. It is also written in pure-perl, but can take
2344	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2502	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2345		2503
2346	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is	2504	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2347	installed.	2505	installed.
2348		2506
…		…
2366		2524
2367	Most event libraries are not fork-safe. The ones who are usually are	2525	Most event libraries are not fork-safe. The ones who are usually are
2368	because they rely on inefficient but fork-safe C<select> or C<poll>	2526	because they rely on inefficient but fork-safe C<select> or C<poll>
2369	calls. Only L<EV> is fully fork-aware.	2527	calls. Only L<EV> is fully fork-aware.
2370		2528
		2529	This means that, in general, you cannot fork and do event processing
		2530	in the child if a watcher was created before the fork (which in turn
		2531	initialises the event library).
		2532
2371	If you have to fork, you must either do so I<before> creating your first	2533	If you have to fork, you must either do so I<before> creating your first
2372	watcher OR you must not use AnyEvent at all in the child OR you must do	2534	watcher OR you must not use AnyEvent at all in the child OR you must do
2373	something completely out of the scope of AnyEvent.	2535	something completely out of the scope of AnyEvent.
		2536
		2537	The problem of doing event processing in the parent I<and> the child
		2538	is much more complicated: even for backends that I<are> fork-aware or
		2539	fork-safe, their behaviour is not usually what you want: fork clones all
		2540	watchers, that means all timers, I/O watchers etc. are active in both
		2541	parent and child, which is almost never what you want.
2374		2542
2375		2543
2376	=head1 SECURITY CONSIDERATIONS	2544	=head1 SECURITY CONSIDERATIONS
2377		2545
2378	AnyEvent can be forced to load any event model via	2546	AnyEvent can be forced to load any event model via
…		…
2416	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2584	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2417		2585
2418	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2586	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2419	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2587	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2420	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2588	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2421	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.	2589	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.
2422		2590
2423	Non-blocking file handles, sockets, TCP clients and	2591	Non-blocking file handles, sockets, TCP clients and
2424	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	2592	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2425		2593
2426	Asynchronous DNS: L<AnyEvent::DNS>.	2594	Asynchronous DNS: L<AnyEvent::DNS>.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.253 by root, Tue Jul 21 06:00:47 2009 UTC vs. Revision 1.301 by root, Tue Dec 1 18:04:21 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.253 by root, Tue Jul 21 06:00:47 2009 UTC vs.
Revision 1.301 by root, Tue Dec 1 18:04:21 2009 UTC