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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.259 by root, Tue Jul 28 02:07:18 2009 UTC vs.
Revision 1.306 by root, Tue Dec 15 05:49:13 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 - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
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 = 4.88;	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())...
…		…
1289	}	1405	}
1290		1406
1291	# default implementation for ->signal	1407	# default implementation for ->signal
1292		1408
1293	our $HAVE_ASYNC_INTERRUPT;	1409	our $HAVE_ASYNC_INTERRUPT;
		1410
		1411	sub _have_async_interrupt() {
		1412	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1413	&& eval "use Async::Interrupt 1.02 (); 1")
		1414	unless defined $HAVE_ASYNC_INTERRUPT;
		1415
		1416	$HAVE_ASYNC_INTERRUPT
		1417	}
		1418
1294	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1419	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1295	our (%SIG_ASY, %SIG_ASY_W);	1420	our (%SIG_ASY, %SIG_ASY_W);
1296	our ($SIG_COUNT, $SIG_TW);	1421	our ($SIG_COUNT, $SIG_TW);
1297		1422
1298	sub _signal_exec {	1423	sub _signal_exec {
1299	$HAVE_ASYNC_INTERRUPT	1424	$HAVE_ASYNC_INTERRUPT
1300	? $SIGPIPE_R->drain	1425	? $SIGPIPE_R->drain
1301	: sysread $SIGPIPE_R, my $dummy, 9;	1426	: sysread $SIGPIPE_R, (my $dummy), 9;
1302		1427
1303	while (%SIG_EV) {	1428	while (%SIG_EV) {
1304	for (keys %SIG_EV) {	1429	for (keys %SIG_EV) {
1305	delete $SIG_EV{$_};	1430	delete $SIG_EV{$_};
1306	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1431	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1307	}	1432	}
1308	}	1433	}
1309	}	1434	}
1310		1435
1311	# install a dumym wakeupw atcher to reduce signal catching latency	1436	# install a dummy wakeup watcher to reduce signal catching latency
1312	sub _sig_add() {	1437	sub _sig_add() {
1313	unless ($SIG_COUNT++) {	1438	unless ($SIG_COUNT++) {
1314	# try to align timer on a full-second boundary, if possible	1439	# try to align timer on a full-second boundary, if possible
1315	my $NOW = AnyEvent->now;	1440	my $NOW = AE::now;
1316		1441
1317	$SIG_TW = AnyEvent->timer (	1442	$SIG_TW = AE::timer
1318	after => $MAX_SIGNAL_LATENCY - ($NOW - int $NOW),	1443	$MAX_SIGNAL_LATENCY - ($NOW - int $NOW),
1319	interval => $MAX_SIGNAL_LATENCY,	1444	$MAX_SIGNAL_LATENCY,
1320	cb => sub { }, # just for the PERL_ASYNC_CHECK	1445	sub { } # just for the PERL_ASYNC_CHECK
1321	);	1446	;
1322	}	1447	}
1323	}	1448	}
1324		1449
1325	sub _sig_del {	1450	sub _sig_del {
1326	undef $SIG_TW	1451	undef $SIG_TW
1327	unless --$SIG_COUNT;	1452	unless --$SIG_COUNT;
1328	}	1453	}
1329		1454
		1455	our $_sig_name_init; $_sig_name_init = sub {
		1456	eval q{ # poor man's autoloading
		1457	undef $_sig_name_init;
		1458
		1459	if (_have_async_interrupt) {
		1460	*sig2num = \&Async::Interrupt::sig2num;
		1461	*sig2name = \&Async::Interrupt::sig2name;
		1462	} else {
		1463	require Config;
		1464
		1465	my %signame2num;
		1466	@signame2num{ split ' ', $Config::Config{sig_name} }
		1467	= split ' ', $Config::Config{sig_num};
		1468
		1469	my @signum2name;
		1470	@signum2name[values %signame2num] = keys %signame2num;
		1471
		1472	*sig2num = sub($) {
		1473	$_[0] > 0 ? shift : $signame2num{+shift}
		1474	};
		1475	*sig2name = sub ($) {
		1476	$_[0] > 0 ? $signum2name[+shift] : shift
		1477	};
		1478	}
		1479	};
		1480	die if $@;
		1481	};
		1482
		1483	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1484	sub sig2name($) { &$_sig_name_init; &sig2name }
		1485
1330	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 {
1331	my (undef, %arg) = @_;	1523	my (undef, %arg) = @_;
1332		1524
1333	my $signal = uc $arg{signal}	1525	my $signal = uc $arg{signal}
1334	or Carp::croak "required option 'signal' is missing";	1526	or Carp::croak "required option 'signal' is missing";
1335		1527
1336	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1337
1338	if ($HAVE_ASYNC_INTERRUPT) {	1528	if ($HAVE_ASYNC_INTERRUPT) {
1339	# async::interrupt	1529	# async::interrupt
1340		1530
1341	$SIG_ASY{$signal} \|\|= do {	1531	$signal = sig2num $signal;
1342	my $asy = new Async::Interrupt	1532	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1533
		1534	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1343	cb => sub { undef $SIG_EV{$signal} },	1535	cb => sub { undef $SIG_EV{$signal} },
1344	signal => $signal,	1536	signal => $signal,
1345	pipe => [$SIGPIPE_R->filenos],	1537	pipe => [$SIGPIPE_R->filenos],
		1538	pipe_autodrain => 0,
		1539	;
		1540
		1541	} else {
		1542	# pure perl
		1543
		1544	# AE::Util has been loaded in signal
		1545	$signal = sig2name $signal;
		1546	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1547
		1548	$SIG{$signal} \|\|= sub {
		1549	local $!;
		1550	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		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;
1346	;	1557	}
1347	$asy->pipe_autodrain (0);
1348		1558
1349	$asy	1559	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1350	};	1560	};
1351		1561
1352	} else {	1562	*AnyEvent::Base::signal::DESTROY = sub {
1353	# pure perl	1563	my ($signal, $cb) = @{$_[0]};
1354		1564
1355	$SIG{$signal} \|\|= sub {	1565	_sig_del;
1356	local $!;	1566
1357	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1567	delete $SIG_CB{$signal}{$cb};
		1568
		1569	$HAVE_ASYNC_INTERRUPT
		1570	? delete $SIG_ASY{$signal}
		1571	: # delete doesn't work with older perls - they then
		1572	# print weird messages, or just unconditionally exit
		1573	# instead of getting the default action.
1358	undef $SIG_EV{$signal};	1574	undef $SIG{$signal}
		1575	unless keys %{ $SIG_CB{$signal} };
1359	};	1576	};
1360
1361	# can't do signal processing without introducing races in pure perl,
1362	# so limit the signal latency.
1363	_sig_add;
1364	}	1577	};
1365		1578	die if $@;
1366	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1367	}
1368
1369	sub signal {
1370	# probe for availability of Async::Interrupt
1371	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
1372	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1373
1374	$HAVE_ASYNC_INTERRUPT = 1;
1375	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1376	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
1377
1378	} else {
1379	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1380
1381	require Fcntl;
1382
1383	if (AnyEvent::WIN32) {
1384	require AnyEvent::Util;
1385
1386	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1387	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1388	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1389	} else {
1390	pipe $SIGPIPE_R, $SIGPIPE_W;
1391	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1392	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1393
1394	# not strictly required, as $^F is normally 2, but let's make sure...
1395	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1396	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1397	}
1398
1399	$SIGPIPE_R
1400	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1401
1402	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1403	}
1404
1405	*signal = \&_signal;
1406	&signal	1579	&signal
1407	}
1408
1409	sub AnyEvent::Base::signal::DESTROY {
1410	my ($signal, $cb) = @{$_[0]};
1411
1412	_sig_del;
1413
1414	delete $SIG_CB{$signal}{$cb};
1415
1416	$HAVE_ASYNC_INTERRUPT
1417	? delete $SIG_ASY{$signal}
1418	: # delete doesn't work with older perls - they then
1419	# print weird messages, or just unconditionally exit
1420	# instead of getting the default action.
1421	undef $SIG{$signal}
1422	unless keys %{ $SIG_CB{$signal} };
1423	}	1580	}
1424		1581
1425	# default implementation for ->child	1582	# default implementation for ->child
1426		1583
1427	our %PID_CB;	1584	our %PID_CB;
…		…
1456	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1613	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1457	? 1	1614	? 1
1458	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1615	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1459		1616
1460	unless ($CHLD_W) {	1617	unless ($CHLD_W) {
1461	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1618	$CHLD_W = AE::signal CHLD => \&_sigchld;
1462	# child could be a zombie already, so make at least one round	1619	# child could be a zombie already, so make at least one round
1463	&_sigchld;	1620	&_sigchld;
1464	}	1621	}
1465		1622
1466	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1623	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
…		…
1492	# 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,
1493	# within some limits	1650	# within some limits
1494	$w = 0.0001 if $w < 0.0001;	1651	$w = 0.0001 if $w < 0.0001;
1495	$w = 5 if $w > 5;	1652	$w = 5 if $w > 5;
1496		1653
1497	$w = AnyEvent->timer (after => $w, cb => $rcb);	1654	$w = AE::timer $w, 0, $rcb;
1498	} else {	1655	} else {
1499	# clean up...	1656	# clean up...
1500	undef $w;	1657	undef $w;
1501	undef $rcb;	1658	undef $rcb;
1502	}	1659	}
1503	};	1660	};
1504		1661
1505	$w = AnyEvent->timer (after => 0.05, cb => $rcb);	1662	$w = AE::timer 0.05, 0, $rcb;
1506		1663
1507	bless \\$cb, "AnyEvent::Base::idle"	1664	bless \\$cb, "AnyEvent::Base::idle"
1508	}	1665	}
1509		1666
1510	sub AnyEvent::Base::idle::DESTROY {	1667	sub AnyEvent::Base::idle::DESTROY {
…		…
1564	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};	1721	Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak};
1565	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]	1722	wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0]
1566	}	1723	}
1567		1724
1568	sub cb {	1725	sub cb {
1569	$_[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
1570	$_[0]{_ae_cb}	1733	$cv->{_ae_cb}
1571	}	1734	}
1572		1735
1573	sub begin {	1736	sub begin {
1574	++$_[0]{_ae_counter};	1737	++$_[0]{_ae_counter};
1575	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;	1738	$_[0]{_ae_end_cb} = $_[1] if @_ > 1;
…		…
1784	warn "read: $input\n"; # output what has been read	1947	warn "read: $input\n"; # output what has been read
1785	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1948	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1786	},	1949	},
1787	);	1950	);
1788		1951
1789	my $time_watcher; # can only be used once
1790
1791	sub new_timer {
1792	$timer = AnyEvent->timer (after => 1, cb => sub {	1952	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1793	warn "timeout\n"; # print 'timeout' about every second	1953	warn "timeout\n"; # print 'timeout' at most every second
1794	&new_timer; # and restart the time
1795	});	1954	});
1796	}
1797
1798	new_timer; # create first timer
1799		1955
1800	$cv->recv; # wait until user enters /^q/i	1956	$cv->recv; # wait until user enters /^q/i
1801		1957
1802	=head1 REAL-WORLD EXAMPLE	1958	=head1 REAL-WORLD EXAMPLE
1803		1959
…		…
1934	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
1935	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,
1936	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.
1937		2093
1938	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
1939	distribution.	2095	distribution. It uses the L<AE> interface, which makes a real difference
		2096	for the EV and Perl backends only.
1940		2097
1941	=head3 Explanation of the columns	2098	=head3 Explanation of the columns
1942		2099
1943	I<watcher> is the number of event watchers created/destroyed. Since	2100	I<watcher> is the number of event watchers created/destroyed. Since
1944	different event models feature vastly different performances, each event	2101	different event models feature vastly different performances, each event
…		…
1965	watcher.	2122	watcher.
1966		2123
1967	=head3 Results	2124	=head3 Results
1968		2125
1969	name watchers bytes create invoke destroy comment	2126	name watchers bytes create invoke destroy comment
1970	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
1971	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
1972	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
1973	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
1974	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
1975	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
1976	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
1977	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
1978	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
1979	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
1980	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
1981	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
1982		2139
1983	=head3 Discussion	2140	=head3 Discussion
1984		2141
1985	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
1986	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)
…		…
1998	benchmark machine, handling an event takes roughly 1600 CPU cycles with	2155	benchmark machine, handling an event takes roughly 1600 CPU cycles with
1999	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
2000	cycles with POE.	2157	cycles with POE.
2001		2158
2002	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
2003	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
2004	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).
2005	natively.
2006		2164
2007	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
2008	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
2009	interpreter and the backend itself). Nevertheless this shows that it	2167	interpreter and the backend itself). Nevertheless this shows that it
2010	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
…		…
2084	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
2085	(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
2086	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.
2087		2245
2088	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
2089	distribution.	2247	distribution. It uses the L<AE> interface, which makes a real difference
		2248	for the EV and Perl backends only.
2090		2249
2091	=head3 Explanation of the columns	2250	=head3 Explanation of the columns
2092		2251
2093	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
2094	each server has a read and write socket end).	2253	each server has a read and write socket end).
…		…
2102	a new one that moves the timeout into the future.	2261	a new one that moves the timeout into the future.
2103		2262
2104	=head3 Results	2263	=head3 Results
2105		2264
2106	name sockets create request	2265	name sockets create request
2107	EV 20000 69.01 11.16	2266	EV 20000 62.66 7.99
2108	Perl 20000 73.32 35.87	2267	Perl 20000 68.32 32.64
2109	IOAsync 20000 157.00 98.14 epoll	2268	IOAsync 20000 174.06 101.15 epoll
2110	IOAsync 20000 159.31 616.06 poll	2269	IOAsync 20000 174.67 610.84 poll
2111	Event 20000 212.62 257.32	2270	Event 20000 202.69 242.91
2112	Glib 20000 651.16 1896.30	2271	Glib 20000 557.01 1689.52
2113	POE 20000 349.67 12317.24 uses POE::Loop::Event	2272	POE 20000 341.54 12086.32 uses POE::Loop::Event
2114		2273
2115	=head3 Discussion	2274	=head3 Discussion
2116		2275
2117	This benchmark I<does> measure scalability and overall performance of the	2276	This benchmark I<does> measure scalability and overall performance of the
2118	particular event loop.	2277	particular event loop.
…		…
2244	As you can see, the AnyEvent + EV combination even beats the	2403	As you can see, the AnyEvent + EV combination even beats the
2245	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2404	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2246	backend easily beats IO::Lambda and POE.	2405	backend easily beats IO::Lambda and POE.
2247		2406
2248	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
2249	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
2250	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
2251	in a non-blocking way.	2410	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2252		2411
2253	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
2254	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
2255	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.
2256		2415
2257		2416
2258	=head1 SIGNALS	2417	=head1 SIGNALS
2259		2418
2260	AnyEvent currently installs handlers for these signals:	2419	AnyEvent currently installs handlers for these signals:
…		…
2302	it's built-in modules) are required to use it.	2461	it's built-in modules) are required to use it.
2303		2462
2304	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
2305	modules if they are installed.	2464	modules if they are installed.
2306		2465
2307	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
2308	affect AnyEvent's operetion.	2467	affect AnyEvent's operation.
2309		2468
2310	=over 4	2469	=over 4
2311		2470
2312	=item L<Async::Interrupt>	2471	=item L<Async::Interrupt>
2313		2472
…		…
2318	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
2319	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2478	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2320		2479
2321	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
2322	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
2323	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
2324	battery life on laptops).	2483	battery life on laptops).
2325		2484
2326	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
2327	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).
2328		2487
…		…
2349	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
2350	purely used for performance.	2509	purely used for performance.
2351		2510
2352	=item L<JSON> and L<JSON::XS>	2511	=item L<JSON> and L<JSON::XS>
2353		2512
2354	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
2355	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
2356	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.
2357		2516
2358	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
2359	installed.	2518	installed.
2360		2519
…		…
2378		2537
2379	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
2380	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>
2381	calls. Only L<EV> is fully fork-aware.	2540	calls. Only L<EV> is fully fork-aware.
2382		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
2383	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
2384	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
2385	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.
2386		2555
2387		2556
2388	=head1 SECURITY CONSIDERATIONS	2557	=head1 SECURITY CONSIDERATIONS
2389		2558
2390	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 1.259 by root, Tue Jul 28 02:07:18 2009 UTC vs. Revision 1.306 by root, Tue Dec 15 05:49:13 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.259 by root, Tue Jul 28 02:07:18 2009 UTC vs.
Revision 1.306 by root, Tue Dec 15 05:49:13 2009 UTC