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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.246 by root, Sat Jul 18 15:51:52 2009 UTC vs.
Revision 1.265 by root, Wed Jul 29 13:10:58 2009 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent - provide framework for multiple event loops	3	AnyEvent - the DBI of event loop programming
4		4
5	EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported	5	EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt
6	event loops.	6	and POE are various supported event loops/environments.
7		7
8	=head1 SYNOPSIS	8	=head1 SYNOPSIS
9		9
10	use AnyEvent;	10	use AnyEvent;
11		11
40	=head1 INTRODUCTION/TUTORIAL	40	=head1 INTRODUCTION/TUTORIAL
41		41
42	This manpage is mainly a reference manual. If you are interested	42	This manpage is mainly a reference manual. If you are interested
43	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
44	L<AnyEvent::Intro> manpage.	44	L<AnyEvent::Intro> manpage.
		45
		46	=head1 SUPPORT
		47
		48	There is a mailinglist for discussing all things AnyEvent, and an IRC
		49	channel, too.
		50
		51	See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software
		52	Repository>, at L<http://anyevent.schmorp.de>, for more info.
45		53
46	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)	54	=head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
47		55
48	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen	56	Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
49	nowadays. So what is different about AnyEvent?	57	nowadays. So what is different about AnyEvent?
…		…
368		376
369	This watcher might use C<%SIG> (depending on the event loop used),	377	This watcher might use C<%SIG> (depending on the event loop used),
370	so programs overwriting those signals directly will likely not work	378	so programs overwriting those signals directly will likely not work
371	correctly.	379	correctly.
372		380
		381	Example: exit on SIGINT
		382
		383	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		384
		385	=head3 Signal Races, Delays and Workarounds
		386
373	Also note that many event loops (e.g. Glib, Tk, Qt, IO::Async) do not	387	Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching
374	support attaching callbacks to signals, which is a pity, as you cannot do	388	callbacks to signals in a generic way, which is a pity, as you cannot do
375	race-free signal handling in perl. AnyEvent will try to do it's best, but	389	race-free signal handling in perl. AnyEvent will try to do it's best, but
376	in some cases, signals will be delayed. The maximum time a signal might	390	in some cases, signals will be delayed. The maximum time a signal might
377	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10	391	be delayed is specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10
378	seconds). This variable can be changed only before the first signal	392	seconds). This variable can be changed only before the first signal
379	watcher is created, and should be left alone otherwise. Higher values	393	watcher is created, and should be left alone otherwise. Higher values
380	will cause fewer spurious wake-ups, which is better for power and CPU	394	will cause fewer spurious wake-ups, which is better for power and CPU
381	saving. All these problems can be avoided by installing the optional	395	saving. All these problems can be avoided by installing the optional
382	L<Async::Interrupt> module.	396	L<Async::Interrupt> module. This will not work with inherently broken
383		397	event loops such as L<Event> or L<Event::Lib> (and not with L<POE>
384	Example: exit on SIGINT	398	currently, as POE does it's own workaround with one-second latency). With
385		399	those, you just have to suffer the delays.
386	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
387		400
388	=head2 CHILD PROCESS WATCHERS	401	=head2 CHILD PROCESS WATCHERS
389		402
390	You can also watch on a child process exit and catch its exit status.	403	You can also watch on a child process exit and catch its exit status.
391		404
392	The child process is specified by the C<pid> argument (if set to C<0>, it	405	The child process is specified by the C<pid> argument (one some backends,
393	watches for any child process exit). The watcher will triggered only when	406	using C<0> watches for any child process exit, on others this will
394	the child process has finished and an exit status is available, not on	407	croak). The watcher will be triggered only when the child process has
395	any trace events (stopped/continued).	408	finished and an exit status is available, not on any trace events
		409	(stopped/continued).
396		410
397	The callback will be called with the pid and exit status (as returned by	411	The callback will be called with the pid and exit status (as returned by
398	waitpid), so unlike other watcher types, you I<can> rely on child watcher	412	waitpid), so unlike other watcher types, you I<can> rely on child watcher
399	callback arguments.	413	callback arguments.
400		414
…		…
504	Condition variables are similar to callbacks, except that you can	518	Condition variables are similar to callbacks, except that you can
505	optionally wait for them. They can also be called merge points - points	519	optionally wait for them. They can also be called merge points - points
506	in time where multiple outstanding events have been processed. And yet	520	in time where multiple outstanding events have been processed. And yet
507	another way to call them is transactions - each condition variable can be	521	another way to call them is transactions - each condition variable can be
508	used to represent a transaction, which finishes at some point and delivers	522	used to represent a transaction, which finishes at some point and delivers
509	a result.	523	a result. And yet some people know them as "futures" - a promise to
		524	compute/deliver something that you can wait for.
510		525
511	Condition variables are very useful to signal that something has finished,	526	Condition variables are very useful to signal that something has finished,
512	for example, if you write a module that does asynchronous http requests,	527	for example, if you write a module that does asynchronous http requests,
513	then a condition variable would be the ideal candidate to signal the	528	then a condition variable would be the ideal candidate to signal the
514	availability of results. The user can either act when the callback is	529	availability of results. The user can either act when the callback is
…		…
782		797
783	AnyEvent::Impl::Glib based on Glib, slow but very stable.	798	AnyEvent::Impl::Glib based on Glib, slow but very stable.
784	AnyEvent::Impl::Tk based on Tk, very broken.	799	AnyEvent::Impl::Tk based on Tk, very broken.
785	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.	800	AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse.
786	AnyEvent::Impl::POE based on POE, very slow, some limitations.	801	AnyEvent::Impl::POE based on POE, very slow, some limitations.
		802	AnyEvent::Impl::Irssi used when running within irssi.
787		803
788	=item Backends with special needs.	804	=item Backends with special needs.
789		805
790	Qt requires the Qt::Application to be instantiated first, but will	806	Qt requires the Qt::Application to be instantiated first, but will
791	otherwise be picked up automatically. As long as the main program	807	otherwise be picked up automatically. As long as the main program
…		…
865	event module detection too early, for example, L<AnyEvent::AIO> creates	881	event module detection too early, for example, L<AnyEvent::AIO> creates
866	and installs the global L<IO::AIO> watcher in a C<post_detect> block to	882	and installs the global L<IO::AIO> watcher in a C<post_detect> block to
867	avoid autodetecting the event module at load time.	883	avoid autodetecting the event module at load time.
868		884
869	If called in scalar or list context, then it creates and returns an object	885	If called in scalar or list context, then it creates and returns an object
870	that automatically removes the callback again when it is destroyed. See	886	that automatically removes the callback again when it is destroyed (or
		887	C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for
871	L<Coro::BDB> for a case where this is useful.	888	a case where this is useful.
		889
		890	Example: Create a watcher for the IO::AIO module and store it in
		891	C<$WATCHER>. Only do so after the event loop is initialised, though.
		892
		893	our WATCHER;
		894
		895	my $guard = AnyEvent::post_detect {
		896	$WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb);
		897	};
		898
		899	# the \|\|= is important in case post_detect immediately runs the block,
		900	# as to not clobber the newly-created watcher. assigning both watcher and
		901	# post_detect guard to the same variable has the advantage of users being
		902	# able to just C<undef $WATCHER> if the watcher causes them grief.
		903
		904	$WATCHER \|\|= $guard;
872		905
873	=item @AnyEvent::post_detect	906	=item @AnyEvent::post_detect
874		907
875	If there are any code references in this array (you can C<push> to it	908	If there are any code references in this array (you can C<push> to it
876	before or after loading AnyEvent), then they will called directly after	909	before or after loading AnyEvent), then they will called directly after
…		…
1053		1086
1054	BEGIN { AnyEvent::common_sense }	1087	BEGIN { AnyEvent::common_sense }
1055		1088
1056	use Carp ();	1089	use Carp ();
1057		1090
1058	our $VERSION = 4.85;	1091	our $VERSION = 4.881;
1059	our $MODEL;	1092	our $MODEL;
1060		1093
1061	our $AUTOLOAD;	1094	our $AUTOLOAD;
1062	our @ISA;	1095	our @ISA;
1063		1096
…		…
1088	for reverse split /\s,\s/,	1121	for reverse split /\s,\s/,
1089	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";	1122	$ENV{PERL_ANYEVENT_PROTOCOLS} \|\| "ipv4,ipv6";
1090	}	1123	}
1091		1124
1092	my @models = (	1125	my @models = (
1093	[EV:: => AnyEvent::Impl::EV::],	1126	[EV:: => AnyEvent::Impl::EV:: , 1],
1094	[Event:: => AnyEvent::Impl::Event::],	1127	[Event:: => AnyEvent::Impl::Event::, 1],
1095	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::],	1128	[AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1],
1096	# everything below here will not be autoprobed	1129	# everything below here will not (normally) be autoprobed
1097	# as the pureperl backend should work everywhere	1130	# as the pureperl backend should work everywhere
1098	# and is usually faster	1131	# and is usually faster
1099	[Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers	1132	[Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers
1100	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy	1133	[Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy
		1134	[Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package
1101	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles	1135	[Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles
1102	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program	1136	[Qt:: => AnyEvent::Impl::Qt::], # requires special main program
1103	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza	1137	[POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza
1104	[Wx:: => AnyEvent::Impl::POE::],	1138	[Wx:: => AnyEvent::Impl::POE::],
1105	[Prima:: => AnyEvent::Impl::POE::],	1139	[Prima:: => AnyEvent::Impl::POE::],
1106	# IO::Async is just too broken - we would need workarounds for its	1140	# IO::Async is just too broken - we would need workarounds for its
1107	# byzantine signal and broken child handling, among others.	1141	# byzantine signal and broken child handling, among others.
1108	# IO::Async is rather hard to detect, as it doesn't have any	1142	# IO::Async is rather hard to detect, as it doesn't have any
1109	# obvious default class.	1143	# obvious default class.
1110	# [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program	1144	# [0, IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program
1111	# [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program	1145	# [0, IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program
1112	# [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program	1146	# [0, IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program
1113	);	1147	);
1114		1148
1115	our %method = map +($_ => 1),	1149	our %method = map +($_ => 1),
1116	qw(io timer time now now_update signal child idle condvar one_event DESTROY);	1150	qw(io timer time now now_update signal child idle condvar one_event DESTROY);
1117		1151
…		…
1121	my ($cb) = @_;	1155	my ($cb) = @_;
1122		1156
1123	if ($MODEL) {	1157	if ($MODEL) {
1124	$cb->();	1158	$cb->();
1125		1159
1126	1	1160	undef
1127	} else {	1161	} else {
1128	push @post_detect, $cb;	1162	push @post_detect, $cb;
1129		1163
1130	defined wantarray	1164	defined wantarray
1131	? bless \$cb, "AnyEvent::Util::postdetect"	1165	? bless \$cb, "AnyEvent::Util::postdetect"
…		…
1163	}	1197	}
1164	}	1198	}
1165	}	1199	}
1166		1200
1167	unless ($MODEL) {	1201	unless ($MODEL) {
1168	# try to load a model	1202	# try to autoload a model
1169
1170	for (@REGISTRY, @models) {	1203	for (@REGISTRY, @models) {
1171	my ($package, $model) = @$_;	1204	my ($package, $model, $autoload) = @$_;
		1205	if (
		1206	$autoload
1172	if (eval "require $package"	1207	and eval "require $package"
1173	and ${"$package\::VERSION"} > 0	1208	and ${"$package\::VERSION"} > 0
1174	and eval "require $model") {	1209	and eval "require $model"
		1210	) {
1175	$MODEL = $model;	1211	$MODEL = $model;
1176	warn "AnyEvent: autoprobed model '$model', using it.\n" if $VERBOSE >= 2;	1212	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1177	last;	1213	last;
1178	}	1214	}
1179	}	1215	}
1180		1216
1181	$MODEL	1217	$MODEL
…		…
1253	}	1289	}
1254		1290
1255	# default implementation for ->signal	1291	# default implementation for ->signal
1256		1292
1257	our $HAVE_ASYNC_INTERRUPT;	1293	our $HAVE_ASYNC_INTERRUPT;
		1294
		1295	sub _have_async_interrupt() {
		1296	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
		1297	&& eval "use Async::Interrupt 1.0 (); 1")
		1298	unless defined $HAVE_ASYNC_INTERRUPT;
		1299
		1300	$HAVE_ASYNC_INTERRUPT
		1301	}
		1302
1258	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1303	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1259	our (%SIG_ASY, %SIG_ASY_W);	1304	our (%SIG_ASY, %SIG_ASY_W);
1260	our ($SIG_COUNT, $SIG_TW);	1305	our ($SIG_COUNT, $SIG_TW);
1261		1306
1262	sub _signal_exec {	1307	sub _signal_exec {
…		…
1270	$_->() for values %{ $SIG_CB{$_} \|\| {} };	1315	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1271	}	1316	}
1272	}	1317	}
1273	}	1318	}
1274		1319
1275	# install a dumym wakeupw atcher to reduce signal catching latency	1320	# install a dummy wakeup watcher to reduce signal catching latency
1276	sub _sig_add() {	1321	sub _sig_add() {
1277	unless ($SIG_COUNT++) {	1322	unless ($SIG_COUNT++) {
1278	# try to align timer on a full-second boundary, if possible	1323	# try to align timer on a full-second boundary, if possible
1279	my $NOW = AnyEvent->now;	1324	my $NOW = AnyEvent->now;
1280		1325
…		…
1289	sub _sig_del {	1334	sub _sig_del {
1290	undef $SIG_TW	1335	undef $SIG_TW
1291	unless --$SIG_COUNT;	1336	unless --$SIG_COUNT;
1292	}	1337	}
1293		1338
		1339	our $_sig_name_init; $_sig_name_init = sub {
		1340	eval q{ # poor man's autoloading
		1341	undef $_sig_name_init;
		1342
		1343	if (_have_async_interrupt) {
		1344	*sig2num = \&Async::Interrupt::sig2num;
		1345	*sig2name = \&Async::Interrupt::sig2name;
		1346	} else {
		1347	require Config;
		1348
		1349	my %signame2num;
		1350	@signame2num{ split ' ', $Config::Config{sig_name} }
		1351	= split ' ', $Config::Config{sig_num};
		1352
		1353	my @signum2name;
		1354	@signum2name[values %signame2num] = keys %signame2num;
		1355
		1356	*sig2num = sub($) {
		1357	$_[0] > 0 ? shift : $signame2num{+shift}
		1358	};
		1359	*sig2name = sub ($) {
		1360	$_[0] > 0 ? $signum2name[+shift] : shift
		1361	};
		1362	}
		1363	};
		1364	die if $@;
		1365	};
		1366
		1367	sub sig2num ($) { &$_sig_name_init; &sig2num }
		1368	sub sig2name($) { &$_sig_name_init; &sig2name }
		1369
1294	sub _signal {	1370	sub signal {
		1371	eval q{ # poor man's autoloading {}
		1372	# probe for availability of Async::Interrupt
		1373	if (_have_async_interrupt) {
		1374	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
		1375
		1376	$SIGPIPE_R = new Async::Interrupt::EventPipe;
		1377	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
		1378
		1379	} else {
		1380	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
		1381
		1382	require Fcntl;
		1383
		1384	if (AnyEvent::WIN32) {
		1385	require AnyEvent::Util;
		1386
		1387	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1388	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
		1389	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
		1390	} else {
		1391	pipe $SIGPIPE_R, $SIGPIPE_W;
		1392	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
		1393	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1394
		1395	# not strictly required, as $^F is normally 2, but let's make sure...
		1396	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1397	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
		1398	}
		1399
		1400	$SIGPIPE_R
		1401	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1402
		1403	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
		1404	}
		1405
		1406	*signal = sub {
1295	my (undef, %arg) = @_;	1407	my (undef, %arg) = @_;
1296		1408
1297	my $signal = uc $arg{signal}	1409	my $signal = uc $arg{signal}
1298	or Carp::croak "required option 'signal' is missing";	1410	or Carp::croak "required option 'signal' is missing";
1299		1411
1300	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1301
1302	if ($HAVE_ASYNC_INTERRUPT) {	1412	if ($HAVE_ASYNC_INTERRUPT) {
1303	# async::interrupt	1413	# async::interrupt
1304		1414
1305	$SIG_ASY{$signal} \|\|= do {	1415	$signal = sig2num $signal;
1306	my $asy = new Async::Interrupt	1416	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1417
		1418	$SIG_ASY{$signal} \|\|= new Async::Interrupt
1307	cb => sub { undef $SIG_EV{$signal} },	1419	cb => sub { undef $SIG_EV{$signal} },
1308	signal => $signal,	1420	signal => $signal,
1309	pipe => [$SIGPIPE_R->filenos],	1421	pipe => [$SIGPIPE_R->filenos],
		1422	pipe_autodrain => 0,
		1423	;
		1424
		1425	} else {
		1426	# pure perl
		1427
		1428	# AE::Util has been loaded in signal
		1429	$signal = sig2name $signal;
		1430	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
		1431
		1432	$SIG{$signal} \|\|= sub {
		1433	local $!;
		1434	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1435	undef $SIG_EV{$signal};
		1436	};
		1437
		1438	# can't do signal processing without introducing races in pure perl,
		1439	# so limit the signal latency.
		1440	_sig_add;
1310	;	1441	}
1311	$asy->pipe_autodrain (0);
1312		1442
1313	$asy	1443	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1314	};	1444	};
1315		1445
1316	} else {	1446	*AnyEvent::Base::signal::DESTROY = sub {
1317	# pure perl	1447	my ($signal, $cb) = @{$_[0]};
1318		1448
1319	$SIG{$signal} \|\|= sub {	1449	_sig_del;
1320	local $!;	1450
1321	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;	1451	delete $SIG_CB{$signal}{$cb};
		1452
		1453	$HAVE_ASYNC_INTERRUPT
		1454	? delete $SIG_ASY{$signal}
		1455	: # delete doesn't work with older perls - they then
		1456	# print weird messages, or just unconditionally exit
		1457	# instead of getting the default action.
1322	undef $SIG_EV{$signal};	1458	undef $SIG{$signal}
		1459	unless keys %{ $SIG_CB{$signal} };
1323	};	1460	};
1324
1325	# can't do signal processing without introducing races in pure perl,
1326	# so limit the signal latency.
1327	_sig_add;
1328	}	1461	};
1329		1462	die if $@;
1330	bless [$signal, $arg{cb}], "AnyEvent::Base::signal"
1331	}
1332
1333	sub signal {
1334	# probe for availability of Async::Interrupt
1335	if (!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} && eval "use Async::Interrupt 0.6 (); 1") {
1336	warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8;
1337
1338	$HAVE_ASYNC_INTERRUPT = 1;
1339	$SIGPIPE_R = new Async::Interrupt::EventPipe;
1340	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R->fileno, poll => "r", cb => \&_signal_exec);
1341
1342	} else {
1343	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1344
1345	require Fcntl;
1346
1347	if (AnyEvent::WIN32) {
1348	require AnyEvent::Util;
1349
1350	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1351	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1352	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1353	} else {
1354	pipe $SIGPIPE_R, $SIGPIPE_W;
1355	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1356	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1357
1358	# not strictly required, as $^F is normally 2, but let's make sure...
1359	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1360	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;
1361	}
1362
1363	$SIGPIPE_R
1364	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1365
1366	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1367	}
1368
1369	*signal = \&_signal;
1370	&signal	1463	&signal
1371	}
1372
1373	sub AnyEvent::Base::signal::DESTROY {
1374	my ($signal, $cb) = @{$_[0]};
1375
1376	_sig_del;
1377
1378	delete $SIG_CB{$signal}{$cb};
1379
1380	$HAVE_ASYNC_INTERRUPT
1381	? delete $SIG_ASY{$signal}
1382	: # delete doesn't work with older perls - they then
1383	# print weird messages, or just unconditionally exit
1384	# instead of getting the default action.
1385	undef $SIG{$signal}
1386	unless keys %{ $SIG_CB{$signal} };
1387	}	1464	}
1388		1465
1389	# default implementation for ->child	1466	# default implementation for ->child
1390		1467
1391	our %PID_CB;	1468	our %PID_CB;
1392	our $CHLD_W;	1469	our $CHLD_W;
1393	our $CHLD_DELAY_W;	1470	our $CHLD_DELAY_W;
1394	our $WNOHANG;	1471	our $WNOHANG;
1395		1472
		1473	sub _emit_childstatus($$) {
		1474	my (undef, $rpid, $rstatus) = @_;
		1475
		1476	$_->($rpid, $rstatus)
		1477	for values %{ $PID_CB{$rpid} \|\| {} },
		1478	values %{ $PID_CB{0} \|\| {} };
		1479	}
		1480
1396	sub _sigchld {	1481	sub _sigchld {
		1482	my $pid;
		1483
		1484	AnyEvent->_emit_childstatus ($pid, $?)
1397	while (0 < (my $pid = waitpid -1, $WNOHANG)) {	1485	while ($pid = waitpid -1, $WNOHANG) > 0;
1398	$_->($pid, $?)
1399	for values %{ $PID_CB{$pid} \|\| {} },
1400	values %{ $PID_CB{0} \|\| {} };
1401	}
1402	}	1486	}
1403		1487
1404	sub child {	1488	sub child {
1405	my (undef, %arg) = @_;	1489	my (undef, %arg) = @_;
1406		1490
…		…
2270		2354
2271	This slightly arcane module is used to implement fast signal handling: To	2355	This slightly arcane module is used to implement fast signal handling: To
2272	my knowledge, there is no way to do completely race-free and quick	2356	my knowledge, there is no way to do completely race-free and quick
2273	signal handling in pure perl. To ensure that signals still get	2357	signal handling in pure perl. To ensure that signals still get
2274	delivered, AnyEvent will start an interval timer to wake up perl (and	2358	delivered, AnyEvent will start an interval timer to wake up perl (and
2275	catch the signals) with soemd elay (default is 10 seconds, look for	2359	catch the signals) with some delay (default is 10 seconds, look for
2276	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2360	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2277		2361
2278	If this module is available, then it will be used to implement signal	2362	If this module is available, then it will be used to implement signal
2279	catching, which means that signals will not be delayed, and the event loop	2363	catching, which means that signals will not be delayed, and the event loop
2280	will not be interrupted regularly, which is more efficient (And good for	2364	will not be interrupted regularly, which is more efficient (And good for
2281	battery life on laptops).	2365	battery life on laptops).
2282		2366
2283	This affects not just the pure-perl event loop, but also other event loops	2367	This affects not just the pure-perl event loop, but also other event loops
2284	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2368	that have no signal handling on their own (e.g. Glib, Tk, Qt).
		2369
		2370	Some event loops (POE, Event, Event::Lib) offer signal watchers natively,
		2371	and either employ their own workarounds (POE) or use AnyEvent's workaround
		2372	(using C<$AnyEvent::MAX_SIGNAL_LATENCY>). Installing L<Async::Interrupt>
		2373	does nothing for those backends.
2285		2374
2286	=item L<EV>	2375	=item L<EV>
2287		2376
2288	This module isn't really "optional", as it is simply one of the backend	2377	This module isn't really "optional", as it is simply one of the backend
2289	event loops that AnyEvent can use. However, it is simply the best event	2378	event loops that AnyEvent can use. However, it is simply the best event
…		…
2303		2392
2304	=item L<JSON> and L<JSON::XS>	2393	=item L<JSON> and L<JSON::XS>
2305		2394
2306	This module is required when you want to read or write JSON data via	2395	This module is required when you want to read or write JSON data via
2307	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2396	L<AnyEvent::Handle>. It is also written in pure-perl, but can take
2308	advantage of the ulta-high-speed L<JSON::XS> module when it is installed.	2397	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2309		2398
2310	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is	2399	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2311	installed.	2400	installed.
2312		2401
2313	=item L<Net::SSLeay>	2402	=item L<Net::SSLeay>
…		…
2380	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.	2469	L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>.
2381		2470
2382	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,	2471	Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>,
2383	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,	2472	L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>,
2384	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,	2473	L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>,
2385	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>.	2474	L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>.
2386		2475
2387	Non-blocking file handles, sockets, TCP clients and	2476	Non-blocking file handles, sockets, TCP clients and
2388	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.	2477	servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>.
2389		2478
2390	Asynchronous DNS: L<AnyEvent::DNS>.	2479	Asynchronous DNS: L<AnyEvent::DNS>.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.246 by root, Sat Jul 18 15:51:52 2009 UTC vs. Revision 1.265 by root, Wed Jul 29 13:10:58 2009 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.246 by root, Sat Jul 18 15:51:52 2009 UTC vs.
Revision 1.265 by root, Wed Jul 29 13:10:58 2009 UTC