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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.167 by root, Tue Jul 8 23:44:51 2008 UTC vs.
Revision 1.212 by root, Sun Jun 7 16:48:38 2009 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - provide framework for multiple event loops	3	AnyEvent - provide framework for multiple event loops
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops	5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported
		6	event loops.
6		7
7	=head1 SYNOPSIS	8	=head1 SYNOPSIS
8		9
9	use AnyEvent;	10	use AnyEvent;
10		11
		12	# file descriptor readable
11	my $w = AnyEvent->io (fh => $fh, poll => "r\|w", cb => sub {	13	my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... });
		14
		15	# one-shot or repeating timers
		16	my $w = AnyEvent->timer (after => $seconds, cb => sub { ... });
		17	my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ...
		18
		19	print AnyEvent->now; # prints current event loop time
		20	print AnyEvent->time; # think Time::HiRes::time or simply CORE::time.
		21
		22	# POSIX signal
		23	my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... });
		24
		25	# child process exit
		26	my $w = AnyEvent->child (pid => $pid, cb => sub {
		27	my ($pid, $status) = @_;
12	...	28	...
13	});	29	});
14		30
15	my $w = AnyEvent->timer (after => $seconds, cb => sub {	31	# called when event loop idle (if applicable)
16	...	32	my $w = AnyEvent->idle (cb => sub { ... });
17	});
18		33
19	my $w = AnyEvent->condvar; # stores whether a condition was flagged	34	my $w = AnyEvent->condvar; # stores whether a condition was flagged
20	$w->send; # wake up current and all future recv's	35	$w->send; # wake up current and all future recv's
21	$w->recv; # enters "main loop" till $condvar gets ->send	36	$w->recv; # enters "main loop" till $condvar gets ->send
		37	# use a condvar in callback mode:
		38	$w->cb (sub { $_[0]->recv });
22		39
23	=head1 INTRODUCTION/TUTORIAL	40	=head1 INTRODUCTION/TUTORIAL
24		41
25	This manpage is mainly a reference manual. If you are interested	42	This manpage is mainly a reference manual. If you are interested
26	in a tutorial or some gentle introduction, have a look at the	43	in a tutorial or some gentle introduction, have a look at the
33		50
34	Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of	51	Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of
35	policy> and AnyEvent is I<small and efficient>.	52	policy> and AnyEvent is I<small and efficient>.
36		53
37	First and foremost, I<AnyEvent is not an event model> itself, it only	54	First and foremost, I<AnyEvent is not an event model> itself, it only
38	interfaces to whatever event model the main program happens to use in a	55	interfaces to whatever event model the main program happens to use, in a
39	pragmatic way. For event models and certain classes of immortals alike,	56	pragmatic way. For event models and certain classes of immortals alike,
40	the statement "there can only be one" is a bitter reality: In general,	57	the statement "there can only be one" is a bitter reality: In general,
41	only one event loop can be active at the same time in a process. AnyEvent	58	only one event loop can be active at the same time in a process. AnyEvent
42	helps hiding the differences between those event loops.	59	cannot change this, but it can hide the differences between those event
		60	loops.
43		61
44	The goal of AnyEvent is to offer module authors the ability to do event	62	The goal of AnyEvent is to offer module authors the ability to do event
45	programming (waiting for I/O or timer events) without subscribing to a	63	programming (waiting for I/O or timer events) without subscribing to a
46	religion, a way of living, and most importantly: without forcing your	64	religion, a way of living, and most importantly: without forcing your
47	module users into the same thing by forcing them to use the same event	65	module users into the same thing by forcing them to use the same event
48	model you use.	66	model you use.
49		67
50	For modules like POE or IO::Async (which is a total misnomer as it is	68	For modules like POE or IO::Async (which is a total misnomer as it is
51	actually doing all I/O I<synchronously>...), using them in your module is	69	actually doing all I/O I<synchronously>...), using them in your module is
52	like joining a cult: After you joined, you are dependent on them and you	70	like joining a cult: After you joined, you are dependent on them and you
53	cannot use anything else, as it is simply incompatible to everything that	71	cannot use anything else, as they are simply incompatible to everything
54	isn't itself. What's worse, all the potential users of your module are	72	that isn't them. What's worse, all the potential users of your
55	I<also> forced to use the same event loop you use.	73	module are I<also> forced to use the same event loop you use.
56		74
57	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works	75	AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works
58	fine. AnyEvent + Tk works fine etc. etc. but none of these work together	76	fine. AnyEvent + Tk works fine etc. etc. but none of these work together
59	with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if	77	with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if
60	your module uses one of those, every user of your module has to use it,	78	your module uses one of those, every user of your module has to use it,
61	too. But if your module uses AnyEvent, it works transparently with all	79	too. But if your module uses AnyEvent, it works transparently with all
62	event models it supports (including stuff like POE and IO::Async, as long	80	event models it supports (including stuff like IO::Async, as long as those
63	as those use one of the supported event loops. It is trivial to add new	81	use one of the supported event loops. It is trivial to add new event loops
64	event loops to AnyEvent, too, so it is future-proof).	82	to AnyEvent, too, so it is future-proof).
65		83
66	In addition to being free of having to use I<the one and only true event	84	In addition to being free of having to use I<the one and only true event
67	model>, AnyEvent also is free of bloat and policy: with POE or similar	85	model>, AnyEvent also is free of bloat and policy: with POE or similar
68	modules, you get an enormous amount of code and strict rules you have to	86	modules, you get an enormous amount of code and strict rules you have to
69	follow. AnyEvent, on the other hand, is lean and up to the point, by only	87	follow. AnyEvent, on the other hand, is lean and up to the point, by only
…		…
127	These watchers are normal Perl objects with normal Perl lifetime. After	145	These watchers are normal Perl objects with normal Perl lifetime. After
128	creating a watcher it will immediately "watch" for events and invoke the	146	creating a watcher it will immediately "watch" for events and invoke the
129	callback when the event occurs (of course, only when the event model	147	callback when the event occurs (of course, only when the event model
130	is in control).	148	is in control).
131		149
		150	Note that B<callbacks must not permanently change global variables>
		151	potentially in use by the event loop (such as C<$_> or C<$[>) and that B<<
		152	callbacks must not C<die> >>. The former is good programming practise in
		153	Perl and the latter stems from the fact that exception handling differs
		154	widely between event loops.
		155
132	To disable the watcher you have to destroy it (e.g. by setting the	156	To disable the watcher you have to destroy it (e.g. by setting the
133	variable you store it in to C<undef> or otherwise deleting all references	157	variable you store it in to C<undef> or otherwise deleting all references
134	to it).	158	to it).
135		159
136	All watchers are created by calling a method on the C<AnyEvent> class.	160	All watchers are created by calling a method on the C<AnyEvent> class.
…		…
152	=head2 I/O WATCHERS	176	=head2 I/O WATCHERS
153		177
154	You can create an I/O watcher by calling the C<< AnyEvent->io >> method	178	You can create an I/O watcher by calling the C<< AnyEvent->io >> method
155	with the following mandatory key-value pairs as arguments:	179	with the following mandatory key-value pairs as arguments:
156		180
157	C<fh> the Perl I<file handle> (I<not> file descriptor) to watch for events	181	C<fh> is the Perl I<file handle> (I<not> file descriptor) to watch
158	(AnyEvent might or might not keep a reference to this file handle). C<poll>	182	for events (AnyEvent might or might not keep a reference to this file
		183	handle). Note that only file handles pointing to things for which
		184	non-blocking operation makes sense are allowed. This includes sockets,
		185	most character devices, pipes, fifos and so on, but not for example files
		186	or block devices.
		187
159	must be a string that is either C<r> or C<w>, which creates a watcher	188	C<poll> must be a string that is either C<r> or C<w>, which creates a
160	waiting for "r"eadable or "w"ritable events, respectively. C<cb> is the	189	watcher waiting for "r"eadable or "w"ritable events, respectively.
		190
161	callback to invoke each time the file handle becomes ready.	191	C<cb> is the callback to invoke each time the file handle becomes ready.
162		192
163	Although the callback might get passed parameters, their value and	193	Although the callback might get passed parameters, their value and
164	presence is undefined and you cannot rely on them. Portable AnyEvent	194	presence is undefined and you cannot rely on them. Portable AnyEvent
165	callbacks cannot use arguments passed to I/O watcher callbacks.	195	callbacks cannot use arguments passed to I/O watcher callbacks.
166		196
…		…
298	In either case, if you care (and in most cases, you don't), then you	328	In either case, if you care (and in most cases, you don't), then you
299	can get whatever behaviour you want with any event loop, by taking the	329	can get whatever behaviour you want with any event loop, by taking the
300	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into	330	difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into
301	account.	331	account.
302		332
		333	=item AnyEvent->now_update
		334
		335	Some event loops (such as L<EV> or L<AnyEvent::Impl::Perl>) cache
		336	the current time for each loop iteration (see the discussion of L<<
		337	AnyEvent->now >>, above).
		338
		339	When a callback runs for a long time (or when the process sleeps), then
		340	this "current" time will differ substantially from the real time, which
		341	might affect timers and time-outs.
		342
		343	When this is the case, you can call this method, which will update the
		344	event loop's idea of "current time".
		345
		346	Note that updating the time I<might> cause some events to be handled.
		347
303	=back	348	=back
304		349
305	=head2 SIGNAL WATCHERS	350	=head2 SIGNAL WATCHERS
306		351
307	You can watch for signals using a signal watcher, C<signal> is the signal	352	You can watch for signals using a signal watcher, C<signal> is the signal
…		…
330	=head2 CHILD PROCESS WATCHERS	375	=head2 CHILD PROCESS WATCHERS
331		376
332	You can also watch on a child process exit and catch its exit status.	377	You can also watch on a child process exit and catch its exit status.
333		378
334	The child process is specified by the C<pid> argument (if set to C<0>, it	379	The child process is specified by the C<pid> argument (if set to C<0>, it
335	watches for any child process exit). The watcher will trigger as often	380	watches for any child process exit). The watcher will triggered only when
336	as status change for the child are received. This works by installing a	381	the child process has finished and an exit status is available, not on
337	signal handler for C<SIGCHLD>. The callback will be called with the pid	382	any trace events (stopped/continued).
338	and exit status (as returned by waitpid), so unlike other watcher types,	383
339	you I<can> rely on child watcher callback arguments.	384	The callback will be called with the pid and exit status (as returned by
		385	waitpid), so unlike other watcher types, you I<can> rely on child watcher
		386	callback arguments.
		387
		388	This watcher type works by installing a signal handler for C<SIGCHLD>,
		389	and since it cannot be shared, nothing else should use SIGCHLD or reap
		390	random child processes (waiting for specific child processes, e.g. inside
		391	C<system>, is just fine).
340		392
341	There is a slight catch to child watchers, however: you usually start them	393	There is a slight catch to child watchers, however: you usually start them
342	I<after> the child process was created, and this means the process could	394	I<after> the child process was created, and this means the process could
343	have exited already (and no SIGCHLD will be sent anymore).	395	have exited already (and no SIGCHLD will be sent anymore).
344		396
…		…
366	);	418	);
367		419
368	# do something else, then wait for process exit	420	# do something else, then wait for process exit
369	$done->recv;	421	$done->recv;
370		422
		423	=head2 IDLE WATCHERS
		424
		425	Sometimes there is a need to do something, but it is not so important
		426	to do it instantly, but only when there is nothing better to do. This
		427	"nothing better to do" is usually defined to be "no other events need
		428	attention by the event loop".
		429
		430	Idle watchers ideally get invoked when the event loop has nothing
		431	better to do, just before it would block the process to wait for new
		432	events. Instead of blocking, the idle watcher is invoked.
		433
		434	Most event loops unfortunately do not really support idle watchers (only
		435	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
		436	will simply call the callback "from time to time".
		437
		438	Example: read lines from STDIN, but only process them when the
		439	program is otherwise idle:
		440
		441	my @lines; # read data
		442	my $idle_w;
		443	my $io_w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub {
		444	push @lines, scalar <STDIN>;
		445
		446	# start an idle watcher, if not already done
		447	$idle_w \|\|= AnyEvent->idle (cb => sub {
		448	# handle only one line, when there are lines left
		449	if (my $line = shift @lines) {
		450	print "handled when idle: $line";
		451	} else {
		452	# otherwise disable the idle watcher again
		453	undef $idle_w;
		454	}
		455	});
		456	});
		457
371	=head2 CONDITION VARIABLES	458	=head2 CONDITION VARIABLES
372		459
373	If you are familiar with some event loops you will know that all of them	460	If you are familiar with some event loops you will know that all of them
374	require you to run some blocking "loop", "run" or similar function that	461	require you to run some blocking "loop", "run" or similar function that
375	will actively watch for new events and call your callbacks.	462	will actively watch for new events and call your callbacks.
…		…
380	The instrument to do that is called a "condition variable", so called	467	The instrument to do that is called a "condition variable", so called
381	because they represent a condition that must become true.	468	because they represent a condition that must become true.
382		469
383	Condition variables can be created by calling the C<< AnyEvent->condvar	470	Condition variables can be created by calling the C<< AnyEvent->condvar
384	>> method, usually without arguments. The only argument pair allowed is	471	>> method, usually without arguments. The only argument pair allowed is
		472
385	C<cb>, which specifies a callback to be called when the condition variable	473	C<cb>, which specifies a callback to be called when the condition variable
386	becomes true.	474	becomes true, with the condition variable as the first argument (but not
		475	the results).
387		476
388	After creation, the condition variable is "false" until it becomes "true"	477	After creation, the condition variable is "false" until it becomes "true"
389	by calling the C<send> method (or calling the condition variable as if it	478	by calling the C<send> method (or calling the condition variable as if it
390	were a callback, read about the caveats in the description for the C<<	479	were a callback, read about the caveats in the description for the C<<
391	->send >> method).	480	->send >> method).
…		…
447		536
448	my $done = AnyEvent->condvar;	537	my $done = AnyEvent->condvar;
449	my $delay = AnyEvent->timer (after => 5, cb => $done);	538	my $delay = AnyEvent->timer (after => 5, cb => $done);
450	$done->recv;	539	$done->recv;
451		540
		541	Example: Imagine an API that returns a condvar and doesn't support
		542	callbacks. This is how you make a synchronous call, for example from
		543	the main program:
		544
		545	use AnyEvent::CouchDB;
		546
		547	...
		548
		549	my @info = $couchdb->info->recv;
		550
		551	And this is how you would just ste a callback to be called whenever the
		552	results are available:
		553
		554	$couchdb->info->cb (sub {
		555	my @info = $_[0]->recv;
		556	});
		557
452	=head3 METHODS FOR PRODUCERS	558	=head3 METHODS FOR PRODUCERS
453		559
454	These methods should only be used by the producing side, i.e. the	560	These methods should only be used by the producing side, i.e. the
455	code/module that eventually sends the signal. Note that it is also	561	code/module that eventually sends the signal. Note that it is also
456	the producer side which creates the condvar in most cases, but it isn't	562	the producer side which creates the condvar in most cases, but it isn't
…		…
589	=item $bool = $cv->ready	695	=item $bool = $cv->ready
590		696
591	Returns true when the condition is "true", i.e. whether C<send> or	697	Returns true when the condition is "true", i.e. whether C<send> or
592	C<croak> have been called.	698	C<croak> have been called.
593		699
594	=item $cb = $cv->cb ([new callback])	700	=item $cb = $cv->cb ($cb->($cv))
595		701
596	This is a mutator function that returns the callback set and optionally	702	This is a mutator function that returns the callback set and optionally
597	replaces it before doing so.	703	replaces it before doing so.
598		704
599	The callback will be called when the condition becomes "true", i.e. when	705	The callback will be called when the condition becomes "true", i.e. when
…		…
789	=item L<AnyEvent::IGS>	895	=item L<AnyEvent::IGS>
790		896
791	A non-blocking interface to the Internet Go Server protocol (used by	897	A non-blocking interface to the Internet Go Server protocol (used by
792	L<App::IGS>).	898	L<App::IGS>).
793		899
794	=item L<Net::IRC3>	900	=item L<AnyEvent::IRC>
795		901
796	AnyEvent based IRC client module family.	902	AnyEvent based IRC client module family (replacing the older Net::IRC3).
797		903
798	=item L<Net::XMPP2>	904	=item L<Net::XMPP2>
799		905
800	AnyEvent based XMPP (Jabber protocol) module family.	906	AnyEvent based XMPP (Jabber protocol) module family.
801		907
…		…
821	=cut	927	=cut
822		928
823	package AnyEvent;	929	package AnyEvent;
824		930
825	no warnings;	931	no warnings;
826	use strict;	932	use strict qw(vars subs);
827		933
828	use Carp;	934	use Carp;
829		935
830	our $VERSION = 4.2;	936	our $VERSION = 4.411;
831	our $MODEL;	937	our $MODEL;
832		938
833	our $AUTOLOAD;	939	our $AUTOLOAD;
834	our @ISA;	940	our @ISA;
835		941
…		…
867	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	973	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
868	[Wx:: => AnyEvent::Impl::POE::],	974	[Wx:: => AnyEvent::Impl::POE::],
869	[Prima:: => AnyEvent::Impl::POE::],	975	[Prima:: => AnyEvent::Impl::POE::],
870	);	976	);
871		977
872	our %method = map +($_ => 1), qw(io timer time now signal child condvar one_event DESTROY);	978	our %method = map +($_ => 1),
		979	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
873		980
874	our @post_detect;	981	our @post_detect;
875		982
876	sub post_detect(&) {	983	sub post_detect(&) {
877	my ($cb) = @_;	984	my ($cb) = @_;
…		…
882	1	989	1
883	} else {	990	} else {
884	push @post_detect, $cb;	991	push @post_detect, $cb;
885		992
886	defined wantarray	993	defined wantarray
887	? bless \$cb, "AnyEvent::Util::PostDetect"	994	? bless \$cb, "AnyEvent::Util::postdetect"
888	: ()	995	: ()
889	}	996	}
890	}	997	}
891		998
892	sub AnyEvent::Util::PostDetect::DESTROY {	999	sub AnyEvent::Util::postdetect::DESTROY {
893	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1000	@post_detect = grep $_ != ${$_[0]}, @post_detect;
894	}	1001	}
895		1002
896	sub detect() {	1003	sub detect() {
897	unless ($MODEL) {	1004	unless ($MODEL) {
…		…
934	last;	1041	last;
935	}	1042	}
936	}	1043	}
937		1044
938	$MODEL	1045	$MODEL
939	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.";	1046	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
940	}	1047	}
941	}	1048	}
942		1049
943	push @{"$MODEL\::ISA"}, "AnyEvent::Base";	1050	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
944		1051
945	if ($ENV{PERL_ANYEVENT_STRICT}) {
946	unshift @AnyEvent::Base::Strict::ISA, $MODEL;
947	unshift @ISA, AnyEvent::Base::Strict::
948	} else {
949	unshift @ISA, $MODEL;	1052	unshift @ISA, $MODEL;
950	}	1053
		1054	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
951		1055
952	(shift @post_detect)->() while @post_detect;	1056	(shift @post_detect)->() while @post_detect;
953	}	1057	}
954		1058
955	$MODEL	1059	$MODEL
…		…
965		1069
966	my $class = shift;	1070	my $class = shift;
967	$class->$func (@_);	1071	$class->$func (@_);
968	}	1072	}
969		1073
		1074	# utility function to dup a filehandle. this is used by many backends
		1075	# to support binding more than one watcher per filehandle (they usually
		1076	# allow only one watcher per fd, so we dup it to get a different one).
		1077	sub _dupfh($$$$) {
		1078	my ($poll, $fh, $r, $w) = @_;
		1079
		1080	# cygwin requires the fh mode to be matching, unix doesn't
		1081	my ($rw, $mode) = $poll eq "r" ? ($r, "<")
		1082	: $poll eq "w" ? ($w, ">")
		1083	: Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'";
		1084
		1085	open my $fh2, "$mode&" . fileno $fh
		1086	or die "cannot dup() filehandle: $!,";
		1087
		1088	# we assume CLOEXEC is already set by perl in all important cases
		1089
		1090	($fh2, $rw)
		1091	}
		1092
970	package AnyEvent::Base;	1093	package AnyEvent::Base;
971		1094
972	# default implementation for now and time	1095	# default implementations for many methods
973		1096
974	use Time::HiRes ();	1097	BEGIN {
		1098	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
		1099	*_time = \&Time::HiRes::time;
		1100	# if (eval "use POSIX (); (POSIX::times())...
		1101	} else {
		1102	*_time = sub { time }; # epic fail
		1103	}
		1104	}
975		1105
976	sub time { Time::HiRes::time }	1106	sub time { _time }
977	sub now { Time::HiRes::time }	1107	sub now { _time }
		1108	sub now_update { }
978		1109
979	# default implementation for ->condvar	1110	# default implementation for ->condvar
980		1111
981	sub condvar {	1112	sub condvar {
982	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar::	1113	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar"
983	}	1114	}
984		1115
985	# default implementation for ->signal	1116	# default implementation for ->signal
986		1117
987	our %SIG_CB;	1118	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
		1119
		1120	sub _signal_exec {
		1121	sysread $SIGPIPE_R, my $dummy, 4;
		1122
		1123	while (%SIG_EV) {
		1124	for (keys %SIG_EV) {
		1125	delete $SIG_EV{$_};
		1126	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1127	}
		1128	}
		1129	}
988		1130
989	sub signal {	1131	sub signal {
990	my (undef, %arg) = @_;	1132	my (undef, %arg) = @_;
991		1133
		1134	unless ($SIGPIPE_R) {
		1135	require Fcntl;
		1136
		1137	if (AnyEvent::WIN32) {
		1138	require AnyEvent::Util;
		1139
		1140	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1141	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
		1142	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
		1143	} else {
		1144	pipe $SIGPIPE_R, $SIGPIPE_W;
		1145	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
		1146	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1147
		1148	# not strictly required, as $^F is normally 2, but let's make sure...
		1149	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1150	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1151	}
		1152
		1153	$SIGPIPE_R
		1154	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1155
		1156	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
		1157	}
		1158
992	my $signal = uc $arg{signal}	1159	my $signal = uc $arg{signal}
993	or Carp::croak "required option 'signal' is missing";	1160	or Carp::croak "required option 'signal' is missing";
994		1161
995	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1162	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
996	$SIG{$signal} \|\|= sub {	1163	$SIG{$signal} \|\|= sub {
997	$_->() for values %{ $SIG_CB{$signal} \|\| {} };	1164	local $!;
		1165	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1166	undef $SIG_EV{$signal};
998	};	1167	};
999		1168
1000	bless [$signal, $arg{cb}], "AnyEvent::Base::Signal"	1169	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1001	}	1170	}
1002		1171
1003	sub AnyEvent::Base::Signal::DESTROY {	1172	sub AnyEvent::Base::signal::DESTROY {
1004	my ($signal, $cb) = @{$_[0]};	1173	my ($signal, $cb) = @{$_[0]};
1005		1174
1006	delete $SIG_CB{$signal}{$cb};	1175	delete $SIG_CB{$signal}{$cb};
1007		1176
		1177	# delete doesn't work with older perls - they then
		1178	# print weird messages, or just unconditionally exit
		1179	# instead of getting the default action.
1008	delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} };	1180	undef $SIG{$signal} unless keys %{ $SIG_CB{$signal} };
1009	}	1181	}
1010		1182
1011	# default implementation for ->child	1183	# default implementation for ->child
1012		1184
1013	our %PID_CB;	1185	our %PID_CB;
1014	our $CHLD_W;	1186	our $CHLD_W;
1015	our $CHLD_DELAY_W;	1187	our $CHLD_DELAY_W;
1016	our $PID_IDLE;
1017	our $WNOHANG;	1188	our $WNOHANG;
1018		1189
1019	sub _child_wait {	1190	sub _sigchld {
1020	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1191	while (0 < (my $pid = waitpid -1, $WNOHANG)) {
1021	$_->($pid, $?) for (values %{ $PID_CB{$pid} \|\| {} }),	1192	$_->($pid, $?) for (values %{ $PID_CB{$pid} \|\| {} }),
1022	(values %{ $PID_CB{0} \|\| {} });	1193	(values %{ $PID_CB{0} \|\| {} });
1023	}	1194	}
1024
1025	undef $PID_IDLE;
1026	}
1027
1028	sub _sigchld {
1029	# make sure we deliver these changes "synchronous" with the event loop.
1030	$CHLD_DELAY_W \|\|= AnyEvent->timer (after => 0, cb => sub {
1031	undef $CHLD_DELAY_W;
1032	&_child_wait;
1033	});
1034	}	1195	}
1035		1196
1036	sub child {	1197	sub child {
1037	my (undef, %arg) = @_;	1198	my (undef, %arg) = @_;
1038		1199
1039	defined (my $pid = $arg{pid} + 0)	1200	defined (my $pid = $arg{pid} + 0)
1040	or Carp::croak "required option 'pid' is missing";	1201	or Carp::croak "required option 'pid' is missing";
1041		1202
1042	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1203	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1043		1204
1044	unless ($WNOHANG) {
1045	$WNOHANG = eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1205	$WNOHANG \|\|= eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1046	}
1047		1206
1048	unless ($CHLD_W) {	1207	unless ($CHLD_W) {
1049	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);	1208	$CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld);
1050	# child could be a zombie already, so make at least one round	1209	# child could be a zombie already, so make at least one round
1051	&_sigchld;	1210	&_sigchld;
1052	}	1211	}
1053		1212
1054	bless [$pid, $arg{cb}], "AnyEvent::Base::Child"	1213	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1055	}	1214	}
1056		1215
1057	sub AnyEvent::Base::Child::DESTROY {	1216	sub AnyEvent::Base::child::DESTROY {
1058	my ($pid, $cb) = @{$_[0]};	1217	my ($pid, $cb) = @{$_[0]};
1059		1218
1060	delete $PID_CB{$pid}{$cb};	1219	delete $PID_CB{$pid}{$cb};
1061	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1220	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1062		1221
1063	undef $CHLD_W unless keys %PID_CB;	1222	undef $CHLD_W unless keys %PID_CB;
		1223	}
		1224
		1225	# idle emulation is done by simply using a timer, regardless
		1226	# of whether the process is idle or not, and not letting
		1227	# the callback use more than 50% of the time.
		1228	sub idle {
		1229	my (undef, %arg) = @_;
		1230
		1231	my ($cb, $w, $rcb) = $arg{cb};
		1232
		1233	$rcb = sub {
		1234	if ($cb) {
		1235	$w = _time;
		1236	&$cb;
		1237	$w = _time - $w;
		1238
		1239	# never use more then 50% of the time for the idle watcher,
		1240	# within some limits
		1241	$w = 0.0001 if $w < 0.0001;
		1242	$w = 5 if $w > 5;
		1243
		1244	$w = AnyEvent->timer (after => $w, cb => $rcb);
		1245	} else {
		1246	# clean up...
		1247	undef $w;
		1248	undef $rcb;
		1249	}
		1250	};
		1251
		1252	$w = AnyEvent->timer (after => 0.05, cb => $rcb);
		1253
		1254	bless \\$cb, "AnyEvent::Base::idle"
		1255	}
		1256
		1257	sub AnyEvent::Base::idle::DESTROY {
		1258	undef $${$_[0]};
1064	}	1259	}
1065		1260
1066	package AnyEvent::CondVar;	1261	package AnyEvent::CondVar;
1067		1262
1068	our @ISA = AnyEvent::CondVar::Base::;	1263	our @ISA = AnyEvent::CondVar::Base::;
…		…
1121		1316
1122	# undocumented/compatibility with pre-3.4	1317	# undocumented/compatibility with pre-3.4
1123	*broadcast = \&send;	1318	*broadcast = \&send;
1124	*wait = \&_wait;	1319	*wait = \&_wait;
1125		1320
1126	package AnyEvent::Base::Strict;	1321	=head1 ERROR AND EXCEPTION HANDLING
1127		1322
1128	use Carp qw(croak);	1323	In general, AnyEvent does not do any error handling - it relies on the
		1324	caller to do that if required. The L<AnyEvent::Strict> module (see also
		1325	the C<PERL_ANYEVENT_STRICT> environment variable, below) provides strict
		1326	checking of all AnyEvent methods, however, which is highly useful during
		1327	development.
1129		1328
1130	# supply checks for argument validity for many functions	1329	As for exception handling (i.e. runtime errors and exceptions thrown while
		1330	executing a callback), this is not only highly event-loop specific, but
		1331	also not in any way wrapped by this module, as this is the job of the main
		1332	program.
1131		1333
1132	sub io {	1334	The pure perl event loop simply re-throws the exception (usually
1133	my $class = shift;	1335	within C<< condvar->recv >>), the L<Event> and L<EV> modules call C<<
1134	my %arg = @_;	1336	$Event/EV::DIED->() >>, L<Glib> uses C<< install_exception_handler >> and
		1337	so on.
1135		1338
1136	ref $arg{cb}	1339	=head1 ENVIRONMENT VARIABLES
1137	or croak "AnyEvent->io called with illegal cb argument '$arg{cb}'";
1138	delete $arg{cb};
1139
1140	fileno $arg{fh}
1141	or croak "AnyEvent->io called with illegal fh argument '$arg{fh}'";
1142	delete $arg{fh};
1143
1144	$arg{poll} =~ /^[rw]$/
1145	or croak "AnyEvent->io called with illegal poll argument '$arg{poll}'";
1146	delete $arg{poll};
1147
1148	croak "AnyEvent->io called with unsupported parameter(s) " . join ", ", keys %arg
1149	if keys %arg;
1150		1340
1151	$class->SUPER::io (@_)	1341	The following environment variables are used by this module or its
1152	}	1342	submodules:
1153		1343
1154	sub timer {	1344	=over 4
1155	my $class = shift;
1156	my %arg = @_;
1157		1345
1158	ref $arg{cb}	1346	=item C<PERL_ANYEVENT_VERBOSE>
1159	or croak "AnyEvent->timer called with illegal cb argument '$arg{cb}'";
1160	delete $arg{cb};
1161
1162	exists $arg{after}
1163	or croak "AnyEvent->timer called without mandatory 'after' parameter";
1164	delete $arg{after};
1165
1166	$arg{interval} > 0 \|\| !$arg{interval}
1167	or croak "AnyEvent->timer called with illegal interval argument '$arg{interval}'";
1168	delete $arg{interval};
1169
1170	croak "AnyEvent->timer called with unsupported parameter(s) " . join ", ", keys %arg
1171	if keys %arg;
1172		1347
1173	$class->SUPER::timer (@_)	1348	By default, AnyEvent will be completely silent except in fatal
1174	}	1349	conditions. You can set this environment variable to make AnyEvent more
		1350	talkative.
1175		1351
1176	sub signal {	1352	When set to C<1> or higher, causes AnyEvent to warn about unexpected
1177	my $class = shift;	1353	conditions, such as not being able to load the event model specified by
1178	my %arg = @_;	1354	C<PERL_ANYEVENT_MODEL>.
1179		1355
1180	ref $arg{cb}	1356	When set to C<2> or higher, cause AnyEvent to report to STDERR which event
1181	or croak "AnyEvent->signal called with illegal cb argument '$arg{cb}'";	1357	model it chooses.
1182	delete $arg{cb};
1183
1184	eval "require POSIX; defined &POSIX::SIG$arg{signal}"
1185	or croak "AnyEvent->signal called with illegal signal name '$arg{signal}'";
1186	delete $arg{signal};
1187
1188	croak "AnyEvent->signal called with unsupported parameter(s) " . join ", ", keys %arg
1189	if keys %arg;
1190		1358
1191	$class->SUPER::signal (@_)	1359	=item C<PERL_ANYEVENT_STRICT>
1192	}
1193		1360
1194	sub child {	1361	AnyEvent does not do much argument checking by default, as thorough
1195	my $class = shift;	1362	argument checking is very costly. Setting this variable to a true value
1196	my %arg = @_;	1363	will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly
		1364	check the arguments passed to most method calls. If it finds any problems
		1365	it will croak.
1197		1366
1198	ref $arg{cb}	1367	In other words, enables "strict" mode.
1199	or croak "AnyEvent->signal called with illegal cb argument '$arg{cb}'";
1200	delete $arg{cb};
1201
1202	$arg{pid} =~ /^-?\d+$/
1203	or croak "AnyEvent->signal called with illegal pid value '$arg{pid}'";
1204	delete $arg{pid};
1205
1206	croak "AnyEvent->signal called with unsupported parameter(s) " . join ", ", keys %arg
1207	if keys %arg;
1208		1368
1209	$class->SUPER::child (@_)	1369	Unlike C<use strict>, it is definitely recommended ot keep it off in
1210	}	1370	production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while
		1371	developing programs can be very useful, however.
1211		1372
1212	sub condvar {	1373	=item C<PERL_ANYEVENT_MODEL>
1213	my $class = shift;
1214	my %arg = @_;
1215		1374
1216	!exists $arg{cb} or ref $arg{cb}	1375	This can be used to specify the event model to be used by AnyEvent, before
1217	or croak "AnyEvent->condvar called with illegal cb argument '$arg{cb}'";	1376	auto detection and -probing kicks in. It must be a string consisting
1218	delete $arg{cb};	1377	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended
1219		1378	and the resulting module name is loaded and if the load was successful,
1220	croak "AnyEvent->condvar called with unsupported parameter(s) " . join ", ", keys %arg	1379	used as event model. If it fails to load AnyEvent will proceed with
1221	if keys %arg;	1380	auto detection and -probing.
1222		1381
1223	$class->SUPER::condvar (@_)	1382	This functionality might change in future versions.
1224	}
1225		1383
1226	sub time {	1384	For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you
1227	my $class = shift;	1385	could start your program like this:
1228		1386
1229	@_	1387	PERL_ANYEVENT_MODEL=Perl perl ...
1230	and croak "AnyEvent->time wrongly called with paramaters";
1231		1388
1232	$class->SUPER::time (@_)	1389	=item C<PERL_ANYEVENT_PROTOCOLS>
1233	}
1234		1390
1235	sub now {	1391	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
1236	my $class = shift;	1392	for IPv4 or IPv6. The default is unspecified (and might change, or be the result
		1393	of auto probing).
1237		1394
1238	@_	1395	Must be set to a comma-separated list of protocols or address families,
1239	and croak "AnyEvent->now wrongly called with paramaters";	1396	current supported: C<ipv4> and C<ipv6>. Only protocols mentioned will be
		1397	used, and preference will be given to protocols mentioned earlier in the
		1398	list.
1240		1399
1241	$class->SUPER::now (@_)	1400	This variable can effectively be used for denial-of-service attacks
1242	}	1401	against local programs (e.g. when setuid), although the impact is likely
		1402	small, as the program has to handle conenction and other failures anyways.
		1403
		1404	Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6,
		1405	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
		1406	- only support IPv4, never try to resolve or contact IPv6
		1407	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
		1408	IPv6, but prefer IPv6 over IPv4.
		1409
		1410	=item C<PERL_ANYEVENT_EDNS0>
		1411
		1412	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension
		1413	for DNS. This extension is generally useful to reduce DNS traffic, but
		1414	some (broken) firewalls drop such DNS packets, which is why it is off by
		1415	default.
		1416
		1417	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
		1418	EDNS0 in its DNS requests.
		1419
		1420	=item C<PERL_ANYEVENT_MAX_FORKS>
		1421
		1422	The maximum number of child processes that C<AnyEvent::Util::fork_call>
		1423	will create in parallel.
		1424
		1425	=back
1243		1426
1244	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE	1427	=head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE
1245		1428
1246	This is an advanced topic that you do not normally need to use AnyEvent in	1429	This is an advanced topic that you do not normally need to use AnyEvent in
1247	a module. This section is only of use to event loop authors who want to	1430	a module. This section is only of use to event loop authors who want to
…		…
1281		1464
1282	I<rxvt-unicode> also cheats a bit by not providing blocking access to	1465	I<rxvt-unicode> also cheats a bit by not providing blocking access to
1283	condition variables: code blocking while waiting for a condition will	1466	condition variables: code blocking while waiting for a condition will
1284	C<die>. This still works with most modules/usages, and blocking calls must	1467	C<die>. This still works with most modules/usages, and blocking calls must
1285	not be done in an interactive application, so it makes sense.	1468	not be done in an interactive application, so it makes sense.
1286
1287	=head1 ENVIRONMENT VARIABLES
1288
1289	The following environment variables are used by this module:
1290
1291	=over 4
1292
1293	=item C<PERL_ANYEVENT_VERBOSE>
1294
1295	By default, AnyEvent will be completely silent except in fatal
1296	conditions. You can set this environment variable to make AnyEvent more
1297	talkative.
1298
1299	When set to C<1> or higher, causes AnyEvent to warn about unexpected
1300	conditions, such as not being able to load the event model specified by
1301	C<PERL_ANYEVENT_MODEL>.
1302
1303	When set to C<2> or higher, cause AnyEvent to report to STDERR which event
1304	model it chooses.
1305
1306	=item C<PERL_ANYEVENT_STRICT>
1307
1308	AnyEvent does not do much argument checking by default, as thorough
1309	argument checking is very costly. Setting this variable to a true value
1310	will cause AnyEvent to thoroughly check the arguments passed to most
1311	method calls and croaks if it finds any problems. In other words, enables
1312	"strict" mode. Unlike C<use strict> it is definitely recommended ot keep
1313	it off in production.
1314
1315	=item C<PERL_ANYEVENT_MODEL>
1316
1317	This can be used to specify the event model to be used by AnyEvent, before
1318	auto detection and -probing kicks in. It must be a string consisting
1319	entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended
1320	and the resulting module name is loaded and if the load was successful,
1321	used as event model. If it fails to load AnyEvent will proceed with
1322	auto detection and -probing.
1323
1324	This functionality might change in future versions.
1325
1326	For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you
1327	could start your program like this:
1328
1329	PERL_ANYEVENT_MODEL=Perl perl ...
1330
1331	=item C<PERL_ANYEVENT_PROTOCOLS>
1332
1333	Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
1334	for IPv4 or IPv6. The default is unspecified (and might change, or be the result
1335	of auto probing).
1336
1337	Must be set to a comma-separated list of protocols or address families,
1338	current supported: C<ipv4> and C<ipv6>. Only protocols mentioned will be
1339	used, and preference will be given to protocols mentioned earlier in the
1340	list.
1341
1342	This variable can effectively be used for denial-of-service attacks
1343	against local programs (e.g. when setuid), although the impact is likely
1344	small, as the program has to handle connection errors already-
1345
1346	Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6,
1347	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1348	- only support IPv4, never try to resolve or contact IPv6
1349	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
1350	IPv6, but prefer IPv6 over IPv4.
1351
1352	=item C<PERL_ANYEVENT_EDNS0>
1353
1354	Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension
1355	for DNS. This extension is generally useful to reduce DNS traffic, but
1356	some (broken) firewalls drop such DNS packets, which is why it is off by
1357	default.
1358
1359	Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce
1360	EDNS0 in its DNS requests.
1361
1362	=item C<PERL_ANYEVENT_MAX_FORKS>
1363
1364	The maximum number of child processes that C<AnyEvent::Util::fork_call>
1365	will create in parallel.
1366
1367	=back
1368		1469
1369	=head1 EXAMPLE PROGRAM	1470	=head1 EXAMPLE PROGRAM
1370		1471
1371	The following program uses an I/O watcher to read data from STDIN, a timer	1472	The following program uses an I/O watcher to read data from STDIN, a timer
1372	to display a message once per second, and a condition variable to quit the	1473	to display a message once per second, and a condition variable to quit the
…		…
1566	watcher.	1667	watcher.
1567		1668
1568	=head3 Results	1669	=head3 Results
1569		1670
1570	name watchers bytes create invoke destroy comment	1671	name watchers bytes create invoke destroy comment
1571	EV/EV 400000 244 0.56 0.46 0.31 EV native interface	1672	EV/EV 400000 224 0.47 0.35 0.27 EV native interface
1572	EV/Any 100000 244 2.50 0.46 0.29 EV + AnyEvent watchers	1673	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers
1573	CoroEV/Any 100000 244 2.49 0.44 0.29 coroutines + Coro::Signal	1674	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal
1574	Perl/Any 100000 513 4.92 0.87 1.12 pure perl implementation	1675	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation
1575	Event/Event 16000 516 31.88 31.30 0.85 Event native interface	1676	Event/Event 16000 517 32.20 31.80 0.81 Event native interface
1576	Event/Any 16000 590 35.75 31.42 1.08 Event + AnyEvent watchers	1677	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers
1577	Glib/Any 16000 1357 98.22 12.41 54.00 quadratic behaviour	1678	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour
1578	Tk/Any 2000 1860 26.97 67.98 14.00 SEGV with >> 2000 watchers	1679	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers
1579	POE/Event 2000 6644 108.64 736.02 14.73 via POE::Loop::Event	1680	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event
1580	POE/Select 2000 6343 94.13 809.12 565.96 via POE::Loop::Select	1681	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select
1581		1682
1582	=head3 Discussion	1683	=head3 Discussion
1583		1684
1584	The benchmark does I<not> measure scalability of the event loop very	1685	The benchmark does I<not> measure scalability of the event loop very
1585	well. For example, a select-based event loop (such as the pure perl one)	1686	well. For example, a select-based event loop (such as the pure perl one)
…		…
1787	watchers, as the management overhead dominates.	1888	watchers, as the management overhead dominates.
1788		1889
1789	=back	1890	=back
1790		1891
1791		1892
		1893	=head1 SIGNALS
		1894
		1895	AnyEvent currently installs handlers for these signals:
		1896
		1897	=over 4
		1898
		1899	=item SIGCHLD
		1900
		1901	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher
		1902	emulation for event loops that do not support them natively. Also, some
		1903	event loops install a similar handler.
		1904
		1905	=item SIGPIPE
		1906
		1907	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>
		1908	when AnyEvent gets loaded.
		1909
		1910	The rationale for this is that AnyEvent users usually do not really depend
		1911	on SIGPIPE delivery (which is purely an optimisation for shell use, or
		1912	badly-written programs), but C<SIGPIPE> can cause spurious and rare
		1913	program exits as a lot of people do not expect C<SIGPIPE> when writing to
		1914	some random socket.
		1915
		1916	The rationale for installing a no-op handler as opposed to ignoring it is
		1917	that this way, the handler will be restored to defaults on exec.
		1918
		1919	Feel free to install your own handler, or reset it to defaults.
		1920
		1921	=back
		1922
		1923	=cut
		1924
		1925	$SIG{PIPE} = sub { }
		1926	unless defined $SIG{PIPE};
		1927
		1928
1792	=head1 FORK	1929	=head1 FORK
1793		1930
1794	Most event libraries are not fork-safe. The ones who are usually are	1931	Most event libraries are not fork-safe. The ones who are usually are
1795	because they rely on inefficient but fork-safe C<select> or C<poll>	1932	because they rely on inefficient but fork-safe C<select> or C<poll>
1796	calls. Only L<EV> is fully fork-aware.	1933	calls. Only L<EV> is fully fork-aware.
…		…
1824	=head1 BUGS	1961	=head1 BUGS
1825		1962
1826	Perl 5.8 has numerous memleaks that sometimes hit this module and are hard	1963	Perl 5.8 has numerous memleaks that sometimes hit this module and are hard
1827	to work around. If you suffer from memleaks, first upgrade to Perl 5.10	1964	to work around. If you suffer from memleaks, first upgrade to Perl 5.10
1828	and check wether the leaks still show up. (Perl 5.10.0 has other annoying	1965	and check wether the leaks still show up. (Perl 5.10.0 has other annoying
1829	mamleaks, such as leaking on C<map> and C<grep> but it is usually not as	1966	memleaks, such as leaking on C<map> and C<grep> but it is usually not as
1830	pronounced).	1967	pronounced).
1831		1968
1832		1969
1833	=head1 SEE ALSO	1970	=head1 SEE ALSO
1834		1971

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.167 by root, Tue Jul 8 23:44:51 2008 UTC vs. Revision 1.212 by root, Sun Jun 7 16:48:38 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.167 by root, Tue Jul 8 23:44:51 2008 UTC vs.
Revision 1.212 by root, Sun Jun 7 16:48:38 2009 UTC