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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.263 by root, Wed Jul 29 12:39:21 2009 UTC vs.
Revision 1.305 by root, Sun Dec 13 05:13:15 2009 UTC

…		…
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
		446
		447	$w = AnyEvent->child (pid => <process id>, cb => <callback>);
402		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 (one some backends,	451	The child process is specified by the C<pid> argument (one some backends,
406	using C<0> watches for any child process exit, on others this will	452	using C<0> watches for any child process exit, on others this will
…		…
455	# do something else, then wait for process exit	501	# do something else, then wait for process exit
456	$done->recv;	502	$done->recv;
457		503
458	=head2 IDLE WATCHERS	504	=head2 IDLE WATCHERS
459		505
		506	$w = AnyEvent->idle (cb => <callback>);
		507
460	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
461	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
462	"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
463	attention by the event loop".	511	attention by the event loop".
464		512
…		…
490	});	538	});
491	});	539	});
492		540
493	=head2 CONDITION VARIABLES	541	=head2 CONDITION VARIABLES
494		542
		543	$cv = AnyEvent->condvar;
		544
		545	$cv->send (<list>);
		546	my @res = $cv->recv;
		547
495	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
496	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
497	will actively watch for new events and call your callbacks.	550	will actively watch for new events and call your callbacks.
498		551
499	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
…		…
563	after => 1,	616	after => 1,
564	cb => sub { $result_ready->send },	617	cb => sub { $result_ready->send },
565	);	618	);
566		619
567	# this "blocks" (while handling events) till the callback	620	# this "blocks" (while handling events) till the callback
568	# calls -<send	621	# calls ->send
569	$result_ready->recv;	622	$result_ready->recv;
570		623
571	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
572	variables are also callable directly.	625	variables are also callable directly.
573		626
…		…
637	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
638	to use a condition variable for the whole process.	691	to use a condition variable for the whole process.
639		692
640	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
641	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
642	>>, 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
643	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
644	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.
645		699
646	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
647	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
648	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).
649		703
…		…
676	begung can potentially be zero:	730	begung can potentially be zero:
677		731
678	my $cv = AnyEvent->condvar;	732	my $cv = AnyEvent->condvar;
679		733
680	my %result;	734	my %result;
681	$cv->begin (sub { $cv->send (\%result) });	735	$cv->begin (sub { shift->send (\%result) });
682		736
683	for my $host (@list_of_hosts) {	737	for my $host (@list_of_hosts) {
684	$cv->begin;	738	$cv->begin;
685	ping_host_then_call_callback $host, sub {	739	ping_host_then_call_callback $host, sub {
686	$result{$host} = ...;	740	$result{$host} = ...;
…		…
761	=item $cb = $cv->cb ($cb->($cv))	815	=item $cb = $cv->cb ($cb->($cv))
762		816
763	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
764	replaces it before doing so.	818	replaces it before doing so.
765		819
766	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)
767	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
768	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>
769	is guaranteed not to block.	823	inside the callback or at any later time is guaranteed not to block.
770		824
771	=back	825	=back
772		826
773	=head1 SUPPORTED EVENT LOOPS/BACKENDS	827	=head1 SUPPORTED EVENT LOOPS/BACKENDS
774		828
…		…
777	=over 4	831	=over 4
778		832
779	=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.
780		834
781	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
782	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
783	that, will fall back to its own pure-perl implementation, which is	837	pure-perl implementation, which is available everywhere as it comes with
784	available everywhere as it comes with AnyEvent itself.	838	AnyEvent itself.
785		839
786	AnyEvent::Impl::EV based on EV (interface to libev, best choice).	840	AnyEvent::Impl::EV based on EV (interface to libev, best choice).
787	AnyEvent::Impl::Event based on Event, very stable, few glitches.
788	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.	841	AnyEvent::Impl::Perl pure-perl implementation, fast and portable.
789		842
790	=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.
791		844
792	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
793	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
794	them. This means that AnyEvent will automatically pick the right backend	847	them. This means that AnyEvent will automatically pick the right backend
795	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
796	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.
797		850
		851	AnyEvent::Impl::Event based on Event, very stable, few glitches.
798	AnyEvent::Impl::Glib based on Glib, slow but very stable.	852	AnyEvent::Impl::Glib based on Glib, slow but very stable.
799	AnyEvent::Impl::Tk based on Tk, very broken.	853	AnyEvent::Impl::Tk based on Tk, very broken.
800	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	854	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
801	AnyEvent::Impl::POE based on POE, very slow, some limitations.	855	AnyEvent::Impl::POE based on POE, very slow, some limitations.
802	AnyEvent::Impl::Irssi used when running within irssi.	856	AnyEvent::Impl::Irssi used when running within irssi.
…		…
912	You should check C<$AnyEvent::MODEL> before adding to this array, though:	966	You should check C<$AnyEvent::MODEL> before adding to this array, though:
913	if it is defined then the event loop has already been detected, and the	967	if it is defined then the event loop has already been detected, and the
914	array will be ignored.	968	array will be ignored.
915		969
916	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	970	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
917	it,as it takes care of these details.	971	it, as it takes care of these details.
918		972
919	This variable is mainly useful for modules that can do something useful	973	This variable is mainly useful for modules that can do something useful
920	when AnyEvent is used and thus want to know when it is initialised, but do	974	when AnyEvent is used and thus want to know when it is initialised, but do
921	not need to even load it by default. This array provides the means to hook	975	not need to even load it by default. This array provides the means to hook
922	into AnyEvent passively, without loading it.	976	into AnyEvent passively, without loading it.
		977
		978	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		979	together, you could put this into Coro (this is the actual code used by
		980	Coro to accomplish this):
		981
		982	if (defined $AnyEvent::MODEL) {
		983	# AnyEvent already initialised, so load Coro::AnyEvent
		984	require Coro::AnyEvent;
		985	} else {
		986	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		987	# as soon as it is
		988	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		989	}
923		990
924	=back	991	=back
925		992
926	=head1 WHAT TO DO IN A MODULE	993	=head1 WHAT TO DO IN A MODULE
927		994
…		…
1076		1143
1077	package AnyEvent;	1144	package AnyEvent;
1078		1145
1079	# basically a tuned-down version of common::sense	1146	# basically a tuned-down version of common::sense
1080	sub common_sense {	1147	sub common_sense {
1081	# no warnings	1148	# from common:.sense 1.0
1082	${^WARNING_BITS} ^= ${^WARNING_BITS};	1149	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1083	# use strict vars subs	1150	# use strict vars subs
1084	$^H \|= 0x00000600;	1151	$^H \|= 0x00000600;
1085	}	1152	}
1086		1153
1087	BEGIN { AnyEvent::common_sense }	1154	BEGIN { AnyEvent::common_sense }
1088		1155
1089	use Carp ();	1156	use Carp ();
1090		1157
1091	our $VERSION = 4.881;	1158	our $VERSION = '5.22';
1092	our $MODEL;	1159	our $MODEL;
1093		1160
1094	our $AUTOLOAD;	1161	our $AUTOLOAD;
1095	our @ISA;	1162	our @ISA;
1096		1163
1097	our @REGISTRY;	1164	our @REGISTRY;
1098
1099	our $WIN32;
1100		1165
1101	our $VERBOSE;	1166	our $VERBOSE;
1102		1167
1103	BEGIN {	1168	BEGIN {
1104	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1169	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
…		…
1122	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1187	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1123	}	1188	}
1124		1189
1125	my @models = (	1190	my @models = (
1126	[EV:: => AnyEvent::Impl::EV:: , 1],	1191	[EV:: => AnyEvent::Impl::EV:: , 1],
1127	[Event:: => AnyEvent::Impl::Event::, 1],
1128	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],	1192	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1129	# everything below here will not (normally) be autoprobed	1193	# everything below here will not (normally) be autoprobed
1130	# as the pureperl backend should work everywhere	1194	# as the pureperl backend should work everywhere
1131	# and is usually faster	1195	# and is usually faster
		1196	[Event:: => AnyEvent::Impl::Event::, 1],
1132	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers	1197	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1133	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1198	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
1134	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package	1199	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1135	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1200	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1136	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1201	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
…		…
1139	[Prima:: => AnyEvent::Impl::POE::],	1204	[Prima:: => AnyEvent::Impl::POE::],
1140	# IO::Async is just too broken - we would need workarounds for its	1205	# IO::Async is just too broken - we would need workarounds for its
1141	# byzantine signal and broken child handling, among others.	1206	# byzantine signal and broken child handling, among others.
1142	# IO::Async is rather hard to detect, as it doesn't have any	1207	# IO::Async is rather hard to detect, as it doesn't have any
1143	# obvious default class.	1208	# obvious default class.
1144	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1209	[IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1145	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1210	[IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1146	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1211	[IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
		1212	[AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program
1147	);	1213	);
1148		1214
1149	our %method = map +($_ => 1),	1215	our %method = map +($_ => 1),
1150	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1216	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1151		1217
…		…
1258	# we assume CLOEXEC is already set by perl in all important cases	1324	# we assume CLOEXEC is already set by perl in all important cases
1259		1325
1260	($fh2, $rw)	1326	($fh2, $rw)
1261	}	1327	}
1262		1328
		1329	=head1 SIMPLIFIED AE API
		1330
		1331	Starting with version 5.0, AnyEvent officially supports a second, much
		1332	simpler, API that is designed to reduce the calling, typing and memory
		1333	overhead.
		1334
		1335	See the L<AE> manpage for details.
		1336
		1337	=cut
		1338
		1339	package AE;
		1340
		1341	our $VERSION = $AnyEvent::VERSION;
		1342
		1343	sub io($$$) {
		1344	AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2])
		1345	}
		1346
		1347	sub timer($$$) {
		1348	AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2])
		1349	}
		1350
		1351	sub signal($$) {
		1352	AnyEvent->signal (signal => $_[0], cb => $_[1])
		1353	}
		1354
		1355	sub child($$) {
		1356	AnyEvent->child (pid => $_[0], cb => $_[1])
		1357	}
		1358
		1359	sub idle($) {
		1360	AnyEvent->idle (cb => $_[0])
		1361	}
		1362
		1363	sub cv(;&) {
		1364	AnyEvent->condvar (@_ ? (cb => $_[0]) : ())
		1365	}
		1366
		1367	sub now() {
		1368	AnyEvent->now
		1369	}
		1370
		1371	sub now_update() {
		1372	AnyEvent->now_update
		1373	}
		1374
		1375	sub time() {
		1376	AnyEvent->time
		1377	}
		1378
1263	package AnyEvent::Base;	1379	package AnyEvent::Base;
1264		1380
1265	# default implementations for many methods	1381	# default implementations for many methods
1266		1382
1267	sub _time {	1383	sub _time() {
1268	# probe for availability of Time::HiRes	1384	# probe for availability of Time::HiRes
1269	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1385	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1270	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1386	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1271	*_time = \&Time::HiRes::time;	1387	*_time = \&Time::HiRes::time;
1272	# if (eval "use POSIX (); (POSIX::times())...	1388	# if (eval "use POSIX (); (POSIX::times())...
…		…
1292		1408
1293	our $HAVE_ASYNC_INTERRUPT;	1409	our $HAVE_ASYNC_INTERRUPT;
1294		1410
1295	sub _have_async_interrupt() {	1411	sub _have_async_interrupt() {
1296	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1412	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1297	&& eval "use Async::Interrupt 1.0 (); 1")	1413	&& eval "use Async::Interrupt 1.02 (); 1")
1298	unless defined $HAVE_ASYNC_INTERRUPT;	1414	unless defined $HAVE_ASYNC_INTERRUPT;
1299		1415
1300	$HAVE_ASYNC_INTERRUPT	1416	$HAVE_ASYNC_INTERRUPT
1301	}	1417	}
1302		1418
…		…
1305	our ($SIG_COUNT, $SIG_TW);	1421	our ($SIG_COUNT, $SIG_TW);
1306		1422
1307	sub _signal_exec {	1423	sub _signal_exec {
1308	$HAVE_ASYNC_INTERRUPT	1424	$HAVE_ASYNC_INTERRUPT
1309	? $SIGPIPE_R->drain	1425	? $SIGPIPE_R->drain
1310	: sysread $SIGPIPE_R, my $dummy, 9;	1426	: sysread $SIGPIPE_R, (my $dummy), 9;
1311		1427
1312	while (%SIG_EV) {	1428	while (%SIG_EV) {
1313	for (keys %SIG_EV) {	1429	for (keys %SIG_EV) {
1314	delete $SIG_EV{$_};	1430	delete $SIG_EV{$_};
1315	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1431	$_->() for values %{ $SIG_CB{$_} \|\| {} };
…		…
1319		1435
1320	# install a dummy wakeup watcher to reduce signal catching latency	1436	# install a dummy wakeup watcher to reduce signal catching latency
1321	sub _sig_add() {	1437	sub _sig_add() {
1322	unless ($SIG_COUNT++) {	1438	unless ($SIG_COUNT++) {
1323	# try to align timer on a full-second boundary, if possible	1439	# try to align timer on a full-second boundary, if possible
1324	my $NOW = AnyEvent->now;	1440	my $NOW = AE::now;
1325		1441
1326	$SIG_TW = AnyEvent->timer (	1442	$SIG_TW = AE::timer
1327	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1443	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1328	interval => $MAX_SIGNAL_LATENCY,	1444	$MAX_SIGNAL_LATENCY,
1329	cb => sub { }, # just for the PERL_ASYNC_CHECK	1445	sub { } # just for the PERL_ASYNC_CHECK
1330	);	1446	;
1331	}	1447	}
1332	}	1448	}
1333		1449
1334	sub _sig_del {	1450	sub _sig_del {
1335	undef $SIG_TW	1451	undef $SIG_TW
1336	unless --$SIG_COUNT;	1452	unless --$SIG_COUNT;
1337	}	1453	}
1338		1454
1339	our %SIGNAME2NUM;
1340	our @SIGNUM2NAME;
1341	our $_sig_name_init; $_sig_name_init = sub {	1455	our $_sig_name_init; $_sig_name_init = sub {
		1456	eval q{ # poor man's autoloading
1342	undef $_sig_name_init;	1457	undef $_sig_name_init;
1343		1458
1344	if (_have_async_interrupt) {	1459	if (_have_async_interrupt) {
1345	*sig2num = \&Async::Interrupt::sig2num;	1460	*sig2num = \&Async::Interrupt::sig2num;
1346	*sig2name = \&Async::Interrupt::sig2name;	1461	*sig2name = \&Async::Interrupt::sig2name;
1347	} else {	1462	} else {
1348	require Config;	1463	require Config;
1349		1464
		1465	my %signame2num;
1350	@SIGNAME2NUM{ split ' ', $Config::Config{sig_name} }	1466	@signame2num{ split ' ', $Config::Config{sig_name} }
1351	= split ' ', $Config::Config{sig_num};	1467	= split ' ', $Config::Config{sig_num};
1352	@SIGNUM2NAME[values %SIGNAME2NUM] = keys %SIGNAME2NUM;
1353		1468
		1469	my @signum2name;
		1470	@signum2name[values %signame2num] = keys %signame2num;
		1471
1354	*sig2num = sub($) {	1472	*sig2num = sub($) {
1355	$_[0] > 0 ? shift : $SIGNAME2NUM{+shift}	1473	$_[0] > 0 ? shift : $signame2num{+shift}
1356	};	1474	};
1357	*sig2name = sub ($) {	1475	*sig2name = sub ($) {
1358	$_[0] > 0 ? $SIGNUM2NAME[+shift] : shift	1476	$_[0] > 0 ? $signum2name[+shift] : shift
		1477	};
1359	};	1478	}
1360	}	1479	};
		1480	die if $@;
1361	};	1481	};
1362		1482
1363	sub sig2num ($) { &$_sig_name_init; &sig2num }	1483	sub sig2num ($) { &$_sig_name_init; &sig2num }
1364	sub sig2name($) { &$_sig_name_init; &sig2name }	1484	sub sig2name($) { &$_sig_name_init; &sig2name }
1365		1485
1366	sub _signal {	1486	sub signal {
		1487	eval q{ # poor man's autoloading {}
		1488	# probe for availability of Async::Interrupt
		1489	if (_have_async_interrupt) {
		1490	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
		1491
		1492	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1493	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
		1494
		1495	} else {
		1496	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1497
		1498	require Fcntl;
		1499
		1500	if (AnyEvent::WIN32) {
		1501	require AnyEvent::Util;
		1502
		1503	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1504	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1505	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1506	} else {
		1507	pipe $SIGPIPE_R, $SIGPIPE_W;
		1508	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
		1509	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1510
		1511	# not strictly required, as $^F is normally 2, but let's make sure...
		1512	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1513	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1514	}
		1515
		1516	$SIGPIPE_R
		1517	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1518
		1519	$SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec;
		1520	}
		1521
		1522	*signal = sub {
1367	my (undef, %arg) = @_;	1523	my (undef, %arg) = @_;
1368		1524
1369	my $signal = uc $arg{signal}	1525	my $signal = uc $arg{signal}
1370	or Carp::croak "required option 'signal' is missing";	1526	or Carp::croak "required option 'signal' is missing";
1371		1527
1372	if ($HAVE_ASYNC_INTERRUPT) {	1528	if ($HAVE_ASYNC_INTERRUPT) {
1373	# async::interrupt	1529	# async::interrupt
1374		1530
1375	$signal = sig2num $signal;	1531	$signal = sig2num $signal;
1376	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1532	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1377		1533
1378	$SIG_ASY{$signal} \|\|= new Async::Interrupt	1534	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1379	cb => sub { undef $SIG_EV{$signal} },	1535	cb => sub { undef $SIG_EV{$signal} },
1380	signal => $signal,	1536	signal => $signal,
1381	pipe => [$SIGPIPE_R->filenos],	1537	pipe => [$SIGPIPE_R->filenos],
1382	pipe_autodrain => 0,	1538	pipe_autodrain => 0,
1383	;	1539	;
1384		1540
1385	} else {	1541	} else {
1386	# pure perl	1542	# pure perl
1387		1543
1388	# AE::Util has been loaded in signal	1544	# AE::Util has been loaded in signal
1389	$signal = sig2name $signal;	1545	$signal = sig2name $signal;
1390	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1546	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1391		1547
1392	$SIG{$signal} \|\|= sub {	1548	$SIG{$signal} \|\|= sub {
1393	local $!;	1549	local $!;
1394	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1550	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1395	undef $SIG_EV{$signal};	1551	undef $SIG_EV{$signal};
		1552	};
		1553
		1554	# can't do signal processing without introducing races in pure perl,
		1555	# so limit the signal latency.
		1556	_sig_add;
		1557	}
		1558
		1559	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1396	};	1560	};
1397		1561
1398	# can't do signal processing without introducing races in pure perl,	1562	*AnyEvent::Base::signal::DESTROY = sub {
1399	# so limit the signal latency.	1563	my ($signal, $cb) = @{$_[0]};
		1564
1400	_sig_add;	1565	_sig_del;
1401	}
1402		1566
1403	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"	1567	delete $SIG_CB{$signal}{$cb};
1404	}
1405		1568
1406	sub signal {	1569	$HAVE_ASYNC_INTERRUPT
1407	# probe for availability of Async::Interrupt	1570	? delete $SIG_ASY{$signal}
1408	if (_have_async_interrupt) {	1571	: # delete doesn't work with older perls - they then
1409	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;	1572	# print weird messages, or just unconditionally exit
1410		1573	# instead of getting the default action.
1411	$SIGPIPE_R = new Async::Interrupt::EventPipe;	1574	undef $SIG{$signal}
1412	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);	1575	unless keys %{ $SIG_CB{$signal} };
1413
1414	} else {
1415	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1416
1417	require Fcntl;
1418
1419	if (AnyEvent::WIN32) {
1420	require AnyEvent::Util;
1421
1422	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1423	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1424	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1425	} else {
1426	pipe $SIGPIPE_R, $SIGPIPE_W;
1427	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1428	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1429
1430	# not strictly required, as $^F is normally 2, but let's make sure...
1431	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1432	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1433	}	1576	};
1434
1435	$SIGPIPE_R
1436	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1437
1438	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1439	}	1577	};
1440		1578	die if $@;
1441	*signal = \&_signal;
1442	&signal	1579	&signal
1443	}
1444
1445	sub AnyEvent::Base::signal::DESTROY {
1446	my ($signal, $cb) = @{$_[0]};
1447
1448	_sig_del;
1449
1450	delete $SIG_CB{$signal}{$cb};
1451
1452	$HAVE_ASYNC_INTERRUPT
1453	? delete $SIG_ASY{$signal}
1454	: # delete doesn't work with older perls - they then
1455	# print weird messages, or just unconditionally exit
1456	# instead of getting the default action.
1457	undef $SIG{$signal}
1458	unless keys %{ $SIG_CB{$signal} };
1459	}	1580	}
1460		1581
1461	# default implementation for ->child	1582	# default implementation for ->child
1462		1583
1463	our %PID_CB;	1584	our %PID_CB;
…		…
1492	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1613	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1493	? 1	1614	? 1
1494	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1615	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1495		1616
1496	unless ($CHLD_W) {	1617	unless ($CHLD_W) {
1497	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1618	$CHLD_W = AE::signal CHLD => \&_sigchld;
1498	# child could be a zombie already, so make at least one round	1619	# child could be a zombie already, so make at least one round
1499	&_sigchld;	1620	&_sigchld;
1500	}	1621	}
1501		1622
1502	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1623	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
…		…
1528	# never use more then 50% of the time for the idle watcher,	1649	# never use more then 50% of the time for the idle watcher,
1529	# within some limits	1650	# within some limits
1530	$w = 0.0001 if $w < 0.0001;	1651	$w = 0.0001 if $w < 0.0001;
1531	$w = 5 if $w > 5;	1652	$w = 5 if $w > 5;
1532		1653
1533	$w = AnyEvent->timer (after => $w, cb => $rcb);	1654	$w = AE::timer $w, 0, $rcb;
1534	} else {	1655	} else {
1535	# clean up...	1656	# clean up...
1536	undef $w;	1657	undef $w;
1537	undef $rcb;	1658	undef $rcb;
1538	}	1659	}
1539	};	1660	};
1540		1661
1541	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1662	$w = AE::timer 0.05, 0, $rcb;
1542		1663
1543	bless \\$cb, "AnyEvent::Base::idle"	1664	bless \\$cb, "AnyEvent::Base::idle"
1544	}	1665	}
1545		1666
1546	sub AnyEvent::Base::idle::DESTROY {	1667	sub AnyEvent::Base::idle::DESTROY {
…		…
1600	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1721	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1601	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1722	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1602	}	1723	}
1603		1724
1604	sub cb {	1725	sub cb {
1605	$_[0]{_ae_cb} = $_[1] if @_ > 1;	1726	my $cv = shift;
		1727
		1728	@_
		1729	and $cv->{_ae_cb} = shift
		1730	and $cv->{_ae_sent}
		1731	and (delete $cv->{_ae_cb})->($cv);
		1732
1606	$_[0]{_ae_cb}	1733	$cv->{_ae_cb}
1607	}	1734	}
1608		1735
1609	sub begin {	1736	sub begin {
1610	++$_[0]{_ae_counter};	1737	++$_[0]{_ae_counter};
1611	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1738	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1820	warn "read: $input\n"; # output what has been read	1947	warn "read: $input\n"; # output what has been read
1821	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1948	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1822	},	1949	},
1823	);	1950	);
1824		1951
1825	my $time_watcher; # can only be used once
1826
1827	sub new_timer {
1828	$timer = AnyEvent->timer (after => 1, cb => sub {	1952	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1829	warn "timeout\n"; # print 'timeout' about every second	1953	warn "timeout\n"; # print 'timeout' at most every second
1830	&new_timer; # and restart the time
1831	});	1954	});
1832	}
1833
1834	new_timer; # create first timer
1835		1955
1836	$cv->recv; # wait until user enters /^q/i	1956	$cv->recv; # wait until user enters /^q/i
1837		1957
1838	=head1 REAL-WORLD EXAMPLE	1958	=head1 REAL-WORLD EXAMPLE
1839		1959
…		…
1970	through AnyEvent. The benchmark creates a lot of timers (with a zero	2090	through AnyEvent. The benchmark creates a lot of timers (with a zero
1971	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,	2091	timeout) and I/O watchers (watching STDOUT, a pty, to become writable,
1972	which it is), lets them fire exactly once and destroys them again.	2092	which it is), lets them fire exactly once and destroys them again.
1973		2093
1974	Source code for this benchmark is found as F<eg/bench> in the AnyEvent	2094	Source code for this benchmark is found as F<eg/bench> in the AnyEvent
1975	distribution.	2095	distribution. It uses the L<AE> interface, which makes a real difference
		2096	for the EV and Perl backends only.
1976		2097
1977	=head3 Explanation of the columns	2098	=head3 Explanation of the columns
1978		2099
1979	I<watcher> is the number of event watchers created/destroyed. Since	2100	I<watcher> is the number of event watchers created/destroyed. Since
1980	different event models feature vastly different performances, each event	2101	different event models feature vastly different performances, each event
…		…
2001	watcher.	2122	watcher.
2002		2123
2003	=head3 Results	2124	=head3 Results
2004		2125
2005	name watchers bytes create invoke destroy comment	2126	name watchers bytes create invoke destroy comment
2006	EV/EV 400000 224 0.47 0.35 0.27 EV native interface	2127	EV/EV 100000 223 0.47 0.43 0.27 EV native interface
2007	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers	2128	EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers
2008	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal	2129	Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal
2009	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation	2130	Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation
2010	Event/Event 16000 517 32.20 31.80 0.81 Event native interface	2131	Event/Event 16000 516 31.16 31.84 0.82 Event native interface
2011	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers	2132	Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers
2012	IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll	2133	IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll
2013	IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll	2134	IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll
2014	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour	2135	Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour
2015	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers	2136	Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers
2016	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event	2137	POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event
2017	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select	2138	POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select
2018		2139
2019	=head3 Discussion	2140	=head3 Discussion
2020		2141
2021	The benchmark does I<not> measure scalability of the event loop very	2142	The benchmark does I<not> measure scalability of the event loop very
2022	well. For example, a select-based event loop (such as the pure perl one)	2143	well. For example, a select-based event loop (such as the pure perl one)
…		…
2034	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2155	benchmark machine, handling an event takes roughly 1600 CPU cycles with
2035	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU	2156	EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU
2036	cycles with POE.	2157	cycles with POE.
2037		2158
2038	C<EV> is the sole leader regarding speed and memory use, which are both	2159	C<EV> is the sole leader regarding speed and memory use, which are both
2039	maximal/minimal, respectively. Even when going through AnyEvent, it uses	2160	maximal/minimal, respectively. When using the L<AE> API there is zero
		2161	overhead (when going through the AnyEvent API create is about 5-6 times
		2162	slower, with other times being equal, so still uses far less memory than
2040	far less memory than any other event loop and is still faster than Event	2163	any other event loop and is still faster than Event natively).
2041	natively.
2042		2164
2043	The pure perl implementation is hit in a few sweet spots (both the	2165	The pure perl implementation is hit in a few sweet spots (both the
2044	constant timeout and the use of a single fd hit optimisations in the perl	2166	constant timeout and the use of a single fd hit optimisations in the perl
2045	interpreter and the backend itself). Nevertheless this shows that it	2167	interpreter and the backend itself). Nevertheless this shows that it
2046	adds very little overhead in itself. Like any select-based backend its	2168	adds very little overhead in itself. Like any select-based backend its
…		…
2120	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100	2242	In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100
2121	(1%) are active. This mirrors the activity of large servers with many	2243	(1%) are active. This mirrors the activity of large servers with many
2122	connections, most of which are idle at any one point in time.	2244	connections, most of which are idle at any one point in time.
2123		2245
2124	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent	2246	Source code for this benchmark is found as F<eg/bench2> in the AnyEvent
2125	distribution.	2247	distribution. It uses the L<AE> interface, which makes a real difference
		2248	for the EV and Perl backends only.
2126		2249
2127	=head3 Explanation of the columns	2250	=head3 Explanation of the columns
2128		2251
2129	I<sockets> is the number of sockets, and twice the number of "servers" (as	2252	I<sockets> is the number of sockets, and twice the number of "servers" (as
2130	each server has a read and write socket end).	2253	each server has a read and write socket end).
…		…
2138	a new one that moves the timeout into the future.	2261	a new one that moves the timeout into the future.
2139		2262
2140	=head3 Results	2263	=head3 Results
2141		2264
2142	name sockets create request	2265	name sockets create request
2143	EV 20000 69.01 11.16	2266	EV 20000 62.66 7.99
2144	Perl 20000 73.32 35.87	2267	Perl 20000 68.32 32.64
2145	IOAsync 20000 157.00 98.14 epoll	2268	IOAsync 20000 174.06 101.15 epoll
2146	IOAsync 20000 159.31 616.06 poll	2269	IOAsync 20000 174.67 610.84 poll
2147	Event 20000 212.62 257.32	2270	Event 20000 202.69 242.91
2148	Glib 20000 651.16 1896.30	2271	Glib 20000 557.01 1689.52
2149	POE 20000 349.67 12317.24 uses POE::Loop::Event	2272	POE 20000 341.54 12086.32 uses POE::Loop::Event
2150		2273
2151	=head3 Discussion	2274	=head3 Discussion
2152		2275
2153	This benchmark I<does> measure scalability and overall performance of the	2276	This benchmark I<does> measure scalability and overall performance of the
2154	particular event loop.	2277	particular event loop.
…		…
2280	As you can see, the AnyEvent + EV combination even beats the	2403	As you can see, the AnyEvent + EV combination even beats the
2281	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2404	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2282	backend easily beats IO::Lambda and POE.	2405	backend easily beats IO::Lambda and POE.
2283		2406
2284	And even the 100% non-blocking version written using the high-level (and	2407	And even the 100% non-blocking version written using the high-level (and
2285	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2408	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2286	large margin, even though it does all of DNS, tcp-connect and socket I/O	2409	higher level ("unoptimised") abstractions by a large margin, even though
2287	in a non-blocking way.	2410	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2288		2411
2289	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2412	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2290	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2413	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2291	part of the IO::lambda distribution and were used without any changes.	2414	part of the IO::Lambda distribution and were used without any changes.
2292		2415
2293		2416
2294	=head1 SIGNALS	2417	=head1 SIGNALS
2295		2418
2296	AnyEvent currently installs handlers for these signals:	2419	AnyEvent currently installs handlers for these signals:
…		…
2338	it's built-in modules) are required to use it.	2461	it's built-in modules) are required to use it.
2339		2462
2340	That does not mean that AnyEvent won't take advantage of some additional	2463	That does not mean that AnyEvent won't take advantage of some additional
2341	modules if they are installed.	2464	modules if they are installed.
2342		2465
2343	This section epxlains which additional modules will be used, and how they	2466	This section explains which additional modules will be used, and how they
2344	affect AnyEvent's operetion.	2467	affect AnyEvent's operation.
2345		2468
2346	=over 4	2469	=over 4
2347		2470
2348	=item L<Async::Interrupt>	2471	=item L<Async::Interrupt>
2349		2472
…		…
2354	catch the signals) with some delay (default is 10 seconds, look for	2477	catch the signals) with some delay (default is 10 seconds, look for
2355	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2478	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2356		2479
2357	If this module is available, then it will be used to implement signal	2480	If this module is available, then it will be used to implement signal
2358	catching, which means that signals will not be delayed, and the event loop	2481	catching, which means that signals will not be delayed, and the event loop
2359	will not be interrupted regularly, which is more efficient (And good for	2482	will not be interrupted regularly, which is more efficient (and good for
2360	battery life on laptops).	2483	battery life on laptops).
2361		2484
2362	This affects not just the pure-perl event loop, but also other event loops	2485	This affects not just the pure-perl event loop, but also other event loops
2363	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2486	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2364		2487
…		…
2385	lot less memory), but otherwise doesn't affect guard operation much. It is	2508	lot less memory), but otherwise doesn't affect guard operation much. It is
2386	purely used for performance.	2509	purely used for performance.
2387		2510
2388	=item L<JSON> and L<JSON::XS>	2511	=item L<JSON> and L<JSON::XS>
2389		2512
2390	This module is required when you want to read or write JSON data via	2513	One of these modules is required when you want to read or write JSON data
2391	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2514	via L<AnyEvent::Handle>. It is also written in pure-perl, but can take
2392	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2515	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2393		2516
2394	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is	2517	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2395	installed.	2518	installed.
2396		2519
…		…
2414		2537
2415	Most event libraries are not fork-safe. The ones who are usually are	2538	Most event libraries are not fork-safe. The ones who are usually are
2416	because they rely on inefficient but fork-safe C<select> or C<poll>	2539	because they rely on inefficient but fork-safe C<select> or C<poll>
2417	calls. Only L<EV> is fully fork-aware.	2540	calls. Only L<EV> is fully fork-aware.
2418		2541
		2542	This means that, in general, you cannot fork and do event processing
		2543	in the child if a watcher was created before the fork (which in turn
		2544	initialises the event library).
		2545
2419	If you have to fork, you must either do so I<before> creating your first	2546	If you have to fork, you must either do so I<before> creating your first
2420	watcher OR you must not use AnyEvent at all in the child OR you must do	2547	watcher OR you must not use AnyEvent at all in the child OR you must do
2421	something completely out of the scope of AnyEvent.	2548	something completely out of the scope of AnyEvent.
		2549
		2550	The problem of doing event processing in the parent I<and> the child
		2551	is much more complicated: even for backends that I<are> fork-aware or
		2552	fork-safe, their behaviour is not usually what you want: fork clones all
		2553	watchers, that means all timers, I/O watchers etc. are active in both
		2554	parent and child, which is almost never what you want.
2422		2555
2423		2556
2424	=head1 SECURITY CONSIDERATIONS	2557	=head1 SECURITY CONSIDERATIONS
2425		2558
2426	AnyEvent can be forced to load any event model via	2559	AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.263 by root, Wed Jul 29 12:39:21 2009 UTC vs. Revision 1.305 by root, Sun Dec 13 05:13:15 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.263 by root, Wed Jul 29 12:39:21 2009 UTC vs.
Revision 1.305 by root, Sun Dec 13 05:13:15 2009 UTC