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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.279 by root, Sun Aug 9 16:05:11 2009 UTC vs.
Revision 1.314 by root, Fri Mar 12 23:30:06 2010 UTC

…		…
363	might affect timers and time-outs.	363	might affect timers and time-outs.
364		364
365	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
366	event loop's idea of "current time".	366	event loop's idea of "current time".
367		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
368	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.
369		376
370	=back	377	=back
371		378
372	=head2 SIGNAL WATCHERS	379	=head2 SIGNAL WATCHERS
…		…
395	correctly.	402	correctly.
396		403
397	Example: exit on SIGINT	404	Example: exit on SIGINT
398		405
399	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });	406	my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 });
		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).
400		424
401	=head3 Signal Races, Delays and Workarounds	425	=head3 Signal Races, Delays and Workarounds
402		426
403	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
404	callbacks to signals in a generic way, which is a pity, as you cannot	428	callbacks to signals in a generic way, which is a pity, as you cannot
…		…
479		503
480	=head2 IDLE WATCHERS	504	=head2 IDLE WATCHERS
481		505
482	$w = AnyEvent->idle (cb => <callback>);	506	$w = AnyEvent->idle (cb => <callback>);
483		507
484	Sometimes there is a need to do something, but it is not so important	508	Repeatedly invoke the callback after the process becomes idle, until
485	to do it instantly, but only when there is nothing better to do. This	509	either the watcher is destroyed or new events have been detected.
486	"nothing better to do" is usually defined to be "no other events need
487	attention by the event loop".
488		510
489	Idle watchers ideally get invoked when the event loop has nothing	511	Idle watchers are useful when there is a need to do something, but it
490	better to do, just before it would block the process to wait for new	512	is not so important (or wise) to do it instantly. The callback will be
491	events. Instead of blocking, the idle watcher is invoked.	513	invoked only when there is "nothing better to do", which is usually
		514	defined as "all outstanding events have been handled and no new events
		515	have been detected". That means that idle watchers ideally get invoked
		516	when the event loop has just polled for new events but none have been
		517	detected. Instead of blocking to wait for more events, the idle watchers
		518	will be invoked.
492		519
493	Most event loops unfortunately do not really support idle watchers (only	520	Unfortunately, most event loops do not really support idle watchers (only
494	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent	521	EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
495	will simply call the callback "from time to time".	522	will simply call the callback "from time to time".
496		523
497	Example: read lines from STDIN, but only process them when the	524	Example: read lines from STDIN, but only process them when the
498	program is otherwise idle:	525	program is otherwise idle:
…		…
592	after => 1,	619	after => 1,
593	cb => sub { $result_ready->send },	620	cb => sub { $result_ready->send },
594	);	621	);
595		622
596	# this "blocks" (while handling events) till the callback	623	# this "blocks" (while handling events) till the callback
597	# calls -<send	624	# calls ->send
598	$result_ready->recv;	625	$result_ready->recv;
599		626
600	Example: wait for a timer, but take advantage of the fact that condition	627	Example: wait for a timer, but take advantage of the fact that condition
601	variables are also callable directly.	628	variables are also callable directly.
602		629
…		…
666	one. For example, a function that pings many hosts in parallel might want	693	one. For example, a function that pings many hosts in parallel might want
667	to use a condition variable for the whole process.	694	to use a condition variable for the whole process.
668		695
669	Every call to C<< ->begin >> will increment a counter, and every call to	696	Every call to C<< ->begin >> will increment a counter, and every call to
670	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end	697	C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end
671	>>, the (last) callback passed to C<begin> will be executed. That callback	698	>>, the (last) callback passed to C<begin> will be executed, passing the
672	is I<supposed> to call C<< ->send >>, but that is not required. If no	699	condvar as first argument. That callback is I<supposed> to call C<< ->send
673	callback was set, C<send> will be called without any arguments.	700	>>, but that is not required. If no group callback was set, C<send> will
		701	be called without any arguments.
674		702
675	You can think of C<< $cv->send >> giving you an OR condition (one call	703	You can think of C<< $cv->send >> giving you an OR condition (one call
676	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND	704	sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND
677	condition (all C<begin> calls must be C<end>'ed before the condvar sends).	705	condition (all C<begin> calls must be C<end>'ed before the condvar sends).
678		706
…		…
705	begung can potentially be zero:	733	begung can potentially be zero:
706		734
707	my $cv = AnyEvent->condvar;	735	my $cv = AnyEvent->condvar;
708		736
709	my %result;	737	my %result;
710	$cv->begin (sub { $cv->send (\%result) });	738	$cv->begin (sub { shift->send (\%result) });
711		739
712	for my $host (@list_of_hosts) {	740	for my $host (@list_of_hosts) {
713	$cv->begin;	741	$cv->begin;
714	ping_host_then_call_callback $host, sub {	742	ping_host_then_call_callback $host, sub {
715	$result{$host} = ...;	743	$result{$host} = ...;
…		…
941	You should check C<$AnyEvent::MODEL> before adding to this array, though:	969	You should check C<$AnyEvent::MODEL> before adding to this array, though:
942	if it is defined then the event loop has already been detected, and the	970	if it is defined then the event loop has already been detected, and the
943	array will be ignored.	971	array will be ignored.
944		972
945	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows	973	Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
946	it,as it takes care of these details.	974	it, as it takes care of these details.
947		975
948	This variable is mainly useful for modules that can do something useful	976	This variable is mainly useful for modules that can do something useful
949	when AnyEvent is used and thus want to know when it is initialised, but do	977	when AnyEvent is used and thus want to know when it is initialised, but do
950	not need to even load it by default. This array provides the means to hook	978	not need to even load it by default. This array provides the means to hook
951	into AnyEvent passively, without loading it.	979	into AnyEvent passively, without loading it.
		980
		981	Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
		982	together, you could put this into Coro (this is the actual code used by
		983	Coro to accomplish this):
		984
		985	if (defined $AnyEvent::MODEL) {
		986	# AnyEvent already initialised, so load Coro::AnyEvent
		987	require Coro::AnyEvent;
		988	} else {
		989	# AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
		990	# as soon as it is
		991	push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
		992	}
952		993
953	=back	994	=back
954		995
955	=head1 WHAT TO DO IN A MODULE	996	=head1 WHAT TO DO IN A MODULE
956		997
…		…
1105		1146
1106	package AnyEvent;	1147	package AnyEvent;
1107		1148
1108	# basically a tuned-down version of common::sense	1149	# basically a tuned-down version of common::sense
1109	sub common_sense {	1150	sub common_sense {
1110	# no warnings	1151	# from common:.sense 1.0
1111	${^WARNING_BITS} ^= ${^WARNING_BITS};	1152	${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
1112	# use strict vars subs	1153	# use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
1113	$^H \|= 0x00000600;	1154	$^H \|= 0x00000600;
1114	}	1155	}
1115		1156
1116	BEGIN { AnyEvent::common_sense }	1157	BEGIN { AnyEvent::common_sense }
1117		1158
1118	use Carp ();	1159	use Carp ();
1119		1160
1120	our $VERSION = '5.0';	1161	our $VERSION = '5.25';
1121	our $MODEL;	1162	our $MODEL;
1122		1163
1123	our $AUTOLOAD;	1164	our $AUTOLOAD;
1124	our @ISA;	1165	our @ISA;
1125		1166
1126	our @REGISTRY;	1167	our @REGISTRY;
1127		1168
1128	our $WIN32;
1129
1130	our $VERBOSE;	1169	our $VERBOSE;
1131		1170
1132	BEGIN {	1171	BEGIN {
1133	eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";	1172	require "AnyEvent/constants.pl";
		1173
1134	eval "sub TAINT(){ " . (${^TAINT}*1) . " }";	1174	eval "sub TAINT (){" . (${^TAINT} *1) . "}";
1135		1175
1136	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}	1176	delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
1137	if ${^TAINT};	1177	if ${^TAINT};
1138		1178
1139	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;	1179	$VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1;
…		…
1200	sub AnyEvent::Util::postdetect::DESTROY {	1240	sub AnyEvent::Util::postdetect::DESTROY {
1201	@post_detect = grep $_ != ${$_[0]}, @post_detect;	1241	@post_detect = grep $_ != ${$_[0]}, @post_detect;
1202	}	1242	}
1203		1243
1204	sub detect() {	1244	sub detect() {
		1245	# free some memory
		1246	*detect = sub () { $MODEL };
		1247
		1248	local $!; # for good measure
		1249	local $SIG{__DIE__};
		1250
		1251	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {
		1252	my $model = "AnyEvent::Impl::$1";
		1253	if (eval "require $model") {
		1254	$MODEL = $model;
		1255	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;
		1256	} else {
		1257	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;
		1258	}
		1259	}
		1260
		1261	# check for already loaded models
1205	unless ($MODEL) {	1262	unless ($MODEL) {
1206	local $SIG{__DIE__};	1263	for (@REGISTRY, @models) {
1207		1264	my ($package, $model) = @$_;
1208	if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) {	1265	if (${"$package\::VERSION"} > 0) {
1209	my $model = "AnyEvent::Impl::$1";
1210	if (eval "require $model") {	1266	if (eval "require $model") {
1211	$MODEL = $model;	1267	$MODEL = $model;
1212	warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2;	1268	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;
1213	} else {	1269	last;
1214	warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE;	1270	}
1215	}	1271	}
1216	}	1272	}
1217		1273
1218	# check for already loaded models
1219	unless ($MODEL) {	1274	unless ($MODEL) {
		1275	# try to autoload a model
1220	for (@REGISTRY, @models) {	1276	for (@REGISTRY, @models) {
1221	my ($package, $model) = @$_;	1277	my ($package, $model, $autoload) = @$_;
		1278	if (
		1279	$autoload
		1280	and eval "require $package"
1222	if (${"$package\::VERSION"} > 0) {	1281	and ${"$package\::VERSION"} > 0
1223	if (eval "require $model") {	1282	and eval "require $model"
		1283	) {
1224	$MODEL = $model;	1284	$MODEL = $model;
1225	warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2;	1285	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1226	last;	1286	last;
1227	}
1228	}	1287	}
1229	}	1288	}
1230		1289
1231	unless ($MODEL) {
1232	# try to autoload a model
1233	for (@REGISTRY, @models) {
1234	my ($package, $model, $autoload) = @$_;
1235	if (
1236	$autoload
1237	and eval "require $package"
1238	and ${"$package\::VERSION"} > 0
1239	and eval "require $model"
1240	) {
1241	$MODEL = $model;
1242	warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2;
1243	last;
1244	}
1245	}
1246
1247	$MODEL	1290	$MODEL
1248	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";	1291	or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n";
1249	}
1250	}	1292	}
1251
1252	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
1253
1254	unshift @ISA, $MODEL;
1255
1256	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
1257
1258	(shift @post_detect)->() while @post_detect;
1259	}	1293	}
		1294
		1295	@models = (); # free probe data
		1296
		1297	push @{"$MODEL\::ISA"}, "AnyEvent::Base";
		1298	unshift @ISA, $MODEL;
		1299
		1300	require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT};
		1301
		1302	(shift @post_detect)->() while @post_detect;
1260		1303
1261	$MODEL	1304	$MODEL
1262	}	1305	}
1263		1306
1264	sub AUTOLOAD {	1307	sub AUTOLOAD {
1265	(my $func = $AUTOLOAD) =~ s/.*://;	1308	(my $func = $AUTOLOAD) =~ s/.*://;
1266		1309
1267	$method{$func}	1310	$method{$func}
1268	or Carp::croak "$func: not a valid method for AnyEvent objects";	1311	or Carp::croak "$func: not a valid AnyEvent class method";
1269		1312
1270	detect unless $MODEL;	1313	detect;
1271		1314
1272	my $class = shift;	1315	my $class = shift;
1273	$class->$func (@_);	1316	$class->$func (@_);
1274	}	1317	}
1275		1318
…		…
1342		1385
1343	package AnyEvent::Base;	1386	package AnyEvent::Base;
1344		1387
1345	# default implementations for many methods	1388	# default implementations for many methods
1346		1389
1347	sub _time {	1390	sub _time() {
		1391	eval q{ # poor man's autoloading
1348	# probe for availability of Time::HiRes	1392	# probe for availability of Time::HiRes
1349	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {	1393	if (eval "use Time::HiRes (); Time::HiRes::time (); 1") {
1350	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;	1394	warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8;
1351	*_time = \&Time::HiRes::time;	1395	*_time = \&Time::HiRes::time;
1352	# if (eval "use POSIX (); (POSIX::times())...	1396	# if (eval "use POSIX (); (POSIX::times())...
1353	} else {	1397	} else {
1354	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;	1398	warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
1355	*_time = sub { time }; # epic fail	1399	*_time = sub (){ time }; # epic fail
		1400	}
1356	}	1401	};
		1402	die if $@;
1357		1403
1358	&_time	1404	&_time
1359	}	1405	}
1360		1406
1361	sub time { _time }	1407	sub time { _time }
…		…
1372		1418
1373	our $HAVE_ASYNC_INTERRUPT;	1419	our $HAVE_ASYNC_INTERRUPT;
1374		1420
1375	sub _have_async_interrupt() {	1421	sub _have_async_interrupt() {
1376	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}	1422	$HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT}
1377	&& eval "use Async::Interrupt 1.0 (); 1")	1423	&& eval "use Async::Interrupt 1.02 (); 1")
1378	unless defined $HAVE_ASYNC_INTERRUPT;	1424	unless defined $HAVE_ASYNC_INTERRUPT;
1379		1425
1380	$HAVE_ASYNC_INTERRUPT	1426	$HAVE_ASYNC_INTERRUPT
1381	}	1427	}
1382		1428
1383	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);	1429	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1384	our (%SIG_ASY, %SIG_ASY_W);	1430	our (%SIG_ASY, %SIG_ASY_W);
1385	our ($SIG_COUNT, $SIG_TW);	1431	our ($SIG_COUNT, $SIG_TW);
1386		1432
1387	sub _signal_exec {
1388	$HAVE_ASYNC_INTERRUPT
1389	? $SIGPIPE_R->drain
1390	: sysread $SIGPIPE_R, my $dummy, 9;
1391
1392	while (%SIG_EV) {
1393	for (keys %SIG_EV) {
1394	delete $SIG_EV{$_};
1395	$_->() for values %{ $SIG_CB{$_} \|\| {} };
1396	}
1397	}
1398	}
1399
1400	# install a dummy wakeup watcher to reduce signal catching latency	1433	# install a dummy wakeup watcher to reduce signal catching latency
		1434	# used by Impls
1401	sub _sig_add() {	1435	sub _sig_add() {
1402	unless ($SIG_COUNT++) {	1436	unless ($SIG_COUNT++) {
1403	# try to align timer on a full-second boundary, if possible	1437	# try to align timer on a full-second boundary, if possible
1404	my $NOW = AE::now;	1438	my $NOW = AE::now;
1405		1439
…		…
1457	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;	1491	$SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec;
1458		1492
1459	} else {	1493	} else {
1460	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;	1494	warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8;
1461		1495
1462	require Fcntl;
1463
1464	if (AnyEvent::WIN32) {	1496	if (AnyEvent::WIN32) {
1465	require AnyEvent::Util;	1497	require AnyEvent::Util;
1466		1498
1467	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();	1499	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1468	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;	1500	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R;
1469	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case	1501	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case
1470	} else {	1502	} else {
1471	pipe $SIGPIPE_R, $SIGPIPE_W;	1503	pipe $SIGPIPE_R, $SIGPIPE_W;
1472	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;	1504	fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R;
1473	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case	1505	fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case
1474		1506
1475	# not strictly required, as $^F is normally 2, but let's make sure...	1507	# not strictly required, as $^F is normally 2, but let's make sure...
1476	fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1508	fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1477	fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC;	1509	fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC;
1478	}	1510	}
1479		1511
1480	$SIGPIPE_R	1512	$SIGPIPE_R
1481	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";	1513	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1482		1514
…		…
1536	# print weird messages, or just unconditionally exit	1568	# print weird messages, or just unconditionally exit
1537	# instead of getting the default action.	1569	# instead of getting the default action.
1538	undef $SIG{$signal}	1570	undef $SIG{$signal}
1539	unless keys %{ $SIG_CB{$signal} };	1571	unless keys %{ $SIG_CB{$signal} };
1540	};	1572	};
		1573
		1574	*_signal_exec = sub {
		1575	$HAVE_ASYNC_INTERRUPT
		1576	? $SIGPIPE_R->drain
		1577	: sysread $SIGPIPE_R, (my $dummy), 9;
		1578
		1579	while (%SIG_EV) {
		1580	for (keys %SIG_EV) {
		1581	delete $SIG_EV{$_};
		1582	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1583	}
		1584	}
		1585	};
1541	};	1586	};
1542	die if $@;	1587	die if $@;
		1588
1543	&signal	1589	&signal
1544	}	1590	}
1545		1591
1546	# default implementation for ->child	1592	# default implementation for ->child
1547		1593
1548	our %PID_CB;	1594	our %PID_CB;
1549	our $CHLD_W;	1595	our $CHLD_W;
1550	our $CHLD_DELAY_W;	1596	our $CHLD_DELAY_W;
1551	our $WNOHANG;	1597	our $WNOHANG;
1552		1598
		1599	# used by many Impl's
1553	sub _emit_childstatus($$) {	1600	sub _emit_childstatus($$) {
1554	my (undef, $rpid, $rstatus) = @_;	1601	my (undef, $rpid, $rstatus) = @_;
1555		1602
1556	$_->($rpid, $rstatus)	1603	$_->($rpid, $rstatus)
1557	for values %{ $PID_CB{$rpid} \|\| {} },	1604	for values %{ $PID_CB{$rpid} \|\| {} },
1558	values %{ $PID_CB{0} \|\| {} };	1605	values %{ $PID_CB{0} \|\| {} };
1559	}	1606	}
1560		1607
1561	sub _sigchld {
1562	my $pid;
1563
1564	AnyEvent->_emit_childstatus ($pid, $?)
1565	while ($pid = waitpid -1, $WNOHANG) > 0;
1566	}
1567
1568	sub child {	1608	sub child {
		1609	eval q{ # poor man's autoloading {}
		1610	*_sigchld = sub {
		1611	my $pid;
		1612
		1613	AnyEvent->_emit_childstatus ($pid, $?)
		1614	while ($pid = waitpid -1, $WNOHANG) > 0;
		1615	};
		1616
		1617	*child = sub {
1569	my (undef, %arg) = @_;	1618	my (undef, %arg) = @_;
1570		1619
1571	defined (my $pid = $arg{pid} + 0)	1620	defined (my $pid = $arg{pid} + 0)
1572	or Carp::croak "required option 'pid' is missing";	1621	or Carp::croak "required option 'pid' is missing";
1573		1622
1574	$PID_CB{$pid}{$arg{cb}} = $arg{cb};	1623	$PID_CB{$pid}{$arg{cb}} = $arg{cb};
1575		1624
1576	# WNOHANG is almost cetrainly 1 everywhere	1625	# WNOHANG is almost cetrainly 1 everywhere
1577	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/	1626	$WNOHANG \|\|= $^O =~ /^(?:openbsd\|netbsd\|linux\|freebsd\|cygwin\|MSWin32)$/
1578	? 1	1627	? 1
1579	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;	1628	: eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } \|\| 1;
1580		1629
1581	unless ($CHLD_W) {	1630	unless ($CHLD_W) {
1582	$CHLD_W = AE::signal CHLD => \&_sigchld;	1631	$CHLD_W = AE::signal CHLD => \&_sigchld;
1583	# child could be a zombie already, so make at least one round	1632	# child could be a zombie already, so make at least one round
1584	&_sigchld;	1633	&_sigchld;
1585	}	1634	}
1586		1635
1587	bless [$pid, $arg{cb}], "AnyEvent::Base::child"	1636	bless [$pid, $arg{cb}], "AnyEvent::Base::child"
1588	}	1637	};
1589		1638
1590	sub AnyEvent::Base::child::DESTROY {	1639	*AnyEvent::Base::child::DESTROY = sub {
1591	my ($pid, $cb) = @{$_[0]};	1640	my ($pid, $cb) = @{$_[0]};
1592		1641
1593	delete $PID_CB{$pid}{$cb};	1642	delete $PID_CB{$pid}{$cb};
1594	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };	1643	delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} };
1595		1644
1596	undef $CHLD_W unless keys %PID_CB;	1645	undef $CHLD_W unless keys %PID_CB;
		1646	};
		1647	};
		1648	die if $@;
		1649
		1650	&child
1597	}	1651	}
1598		1652
1599	# idle emulation is done by simply using a timer, regardless	1653	# idle emulation is done by simply using a timer, regardless
1600	# of whether the process is idle or not, and not letting	1654	# of whether the process is idle or not, and not letting
1601	# the callback use more than 50% of the time.	1655	# the callback use more than 50% of the time.
1602	sub idle {	1656	sub idle {
		1657	eval q{ # poor man's autoloading {}
		1658	*idle = sub {
1603	my (undef, %arg) = @_;	1659	my (undef, %arg) = @_;
1604		1660
1605	my ($cb, $w, $rcb) = $arg{cb};	1661	my ($cb, $w, $rcb) = $arg{cb};
1606		1662
1607	$rcb = sub {	1663	$rcb = sub {
1608	if ($cb) {	1664	if ($cb) {
1609	$w = _time;	1665	$w = _time;
1610	&$cb;	1666	&$cb;
1611	$w = _time - $w;	1667	$w = _time - $w;
1612		1668
1613	# never use more then 50% of the time for the idle watcher,	1669	# never use more then 50% of the time for the idle watcher,
1614	# within some limits	1670	# within some limits
1615	$w = 0.0001 if $w < 0.0001;	1671	$w = 0.0001 if $w < 0.0001;
1616	$w = 5 if $w > 5;	1672	$w = 5 if $w > 5;
1617		1673
1618	$w = AE::timer $w, 0, $rcb;	1674	$w = AE::timer $w, 0, $rcb;
1619	} else {	1675	} else {
1620	# clean up...	1676	# clean up...
1621	undef $w;	1677	undef $w;
1622	undef $rcb;	1678	undef $rcb;
		1679	}
		1680	};
		1681
		1682	$w = AE::timer 0.05, 0, $rcb;
		1683
		1684	bless \\$cb, "AnyEvent::Base::idle"
1623	}	1685	};
		1686
		1687	*AnyEvent::Base::idle::DESTROY = sub {
		1688	undef $${$_[0]};
		1689	};
1624	};	1690	};
		1691	die if $@;
1625		1692
1626	$w = AE::timer 0.05, 0, $rcb;	1693	&idle
1627
1628	bless \\$cb, "AnyEvent::Base::idle"
1629	}
1630
1631	sub AnyEvent::Base::idle::DESTROY {
1632	undef $${$_[0]};
1633	}	1694	}
1634		1695
1635	package AnyEvent::CondVar;	1696	package AnyEvent::CondVar;
1636		1697
1637	our @ISA = AnyEvent::CondVar::Base::;	1698	our @ISA = AnyEvent::CondVar::Base::;
…		…
1911	warn "read: $input\n"; # output what has been read	1972	warn "read: $input\n"; # output what has been read
1912	$cv->send if $input =~ /^q/i; # quit program if /^q/i	1973	$cv->send if $input =~ /^q/i; # quit program if /^q/i
1913	},	1974	},
1914	);	1975	);
1915		1976
1916	my $time_watcher; # can only be used once
1917
1918	sub new_timer {
1919	$timer = AnyEvent->timer (after => 1, cb => sub {	1977	my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub {
1920	warn "timeout\n"; # print 'timeout' about every second	1978	warn "timeout\n"; # print 'timeout' at most every second
1921	&new_timer; # and restart the time
1922	});	1979	});
1923	}
1924
1925	new_timer; # create first timer
1926		1980
1927	$cv->recv; # wait until user enters /^q/i	1981	$cv->recv; # wait until user enters /^q/i
1928		1982
1929	=head1 REAL-WORLD EXAMPLE	1983	=head1 REAL-WORLD EXAMPLE
1930		1984
…		…
2374	As you can see, the AnyEvent + EV combination even beats the	2428	As you can see, the AnyEvent + EV combination even beats the
2375	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl	2429	hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
2376	backend easily beats IO::Lambda and POE.	2430	backend easily beats IO::Lambda and POE.
2377		2431
2378	And even the 100% non-blocking version written using the high-level (and	2432	And even the 100% non-blocking version written using the high-level (and
2379	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a	2433	slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
2380	large margin, even though it does all of DNS, tcp-connect and socket I/O	2434	higher level ("unoptimised") abstractions by a large margin, even though
2381	in a non-blocking way.	2435	it does all of DNS, tcp-connect and socket I/O in a non-blocking way.
2382		2436
2383	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and	2437	The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and
2384	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are	2438	F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are
2385	part of the IO::lambda distribution and were used without any changes.	2439	part of the IO::Lambda distribution and were used without any changes.
2386		2440
2387		2441
2388	=head1 SIGNALS	2442	=head1 SIGNALS
2389		2443
2390	AnyEvent currently installs handlers for these signals:	2444	AnyEvent currently installs handlers for these signals:
…		…
2432	it's built-in modules) are required to use it.	2486	it's built-in modules) are required to use it.
2433		2487
2434	That does not mean that AnyEvent won't take advantage of some additional	2488	That does not mean that AnyEvent won't take advantage of some additional
2435	modules if they are installed.	2489	modules if they are installed.
2436		2490
2437	This section epxlains which additional modules will be used, and how they	2491	This section explains which additional modules will be used, and how they
2438	affect AnyEvent's operetion.	2492	affect AnyEvent's operation.
2439		2493
2440	=over 4	2494	=over 4
2441		2495
2442	=item L<Async::Interrupt>	2496	=item L<Async::Interrupt>
2443		2497
…		…
2448	catch the signals) with some delay (default is 10 seconds, look for	2502	catch the signals) with some delay (default is 10 seconds, look for
2449	C<$AnyEvent::MAX_SIGNAL_LATENCY>).	2503	C<$AnyEvent::MAX_SIGNAL_LATENCY>).
2450		2504
2451	If this module is available, then it will be used to implement signal	2505	If this module is available, then it will be used to implement signal
2452	catching, which means that signals will not be delayed, and the event loop	2506	catching, which means that signals will not be delayed, and the event loop
2453	will not be interrupted regularly, which is more efficient (And good for	2507	will not be interrupted regularly, which is more efficient (and good for
2454	battery life on laptops).	2508	battery life on laptops).
2455		2509
2456	This affects not just the pure-perl event loop, but also other event loops	2510	This affects not just the pure-perl event loop, but also other event loops
2457	that have no signal handling on their own (e.g. Glib, Tk, Qt).	2511	that have no signal handling on their own (e.g. Glib, Tk, Qt).
2458		2512
…		…
2479	lot less memory), but otherwise doesn't affect guard operation much. It is	2533	lot less memory), but otherwise doesn't affect guard operation much. It is
2480	purely used for performance.	2534	purely used for performance.
2481		2535
2482	=item L<JSON> and L<JSON::XS>	2536	=item L<JSON> and L<JSON::XS>
2483		2537
2484	This module is required when you want to read or write JSON data via	2538	One of these modules is required when you want to read or write JSON data
2485	L<AnyEvent::Handle>. It is also written in pure-perl, but can take	2539	via L<AnyEvent::Handle>. It is also written in pure-perl, but can take
2486	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.	2540	advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
2487		2541
2488	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is	2542	In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
2489	installed.	2543	installed.
2490		2544
…		…
2505		2559
2506		2560
2507	=head1 FORK	2561	=head1 FORK
2508		2562
2509	Most event libraries are not fork-safe. The ones who are usually are	2563	Most event libraries are not fork-safe. The ones who are usually are
2510	because they rely on inefficient but fork-safe C<select> or C<poll>	2564	because they rely on inefficient but fork-safe C<select> or C<poll> calls
2511	calls. Only L<EV> is fully fork-aware.	2565	- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
		2566	are usually badly thought-out hacks that are incompatible with fork in
		2567	one way or another. Only L<EV> is fully fork-aware and ensures that you
		2568	continue event-processing in both parent and child (or both, if you know
		2569	what you are doing).
		2570
		2571	This means that, in general, you cannot fork and do event processing in
		2572	the child if the event library was initialised before the fork (which
		2573	usually happens when the first AnyEvent watcher is created, or the library
		2574	is loaded).
2512		2575
2513	If you have to fork, you must either do so I<before> creating your first	2576	If you have to fork, you must either do so I<before> creating your first
2514	watcher OR you must not use AnyEvent at all in the child OR you must do	2577	watcher OR you must not use AnyEvent at all in the child OR you must do
2515	something completely out of the scope of AnyEvent.	2578	something completely out of the scope of AnyEvent.
		2579
		2580	The problem of doing event processing in the parent I<and> the child
		2581	is much more complicated: even for backends that I<are> fork-aware or
		2582	fork-safe, their behaviour is not usually what you want: fork clones all
		2583	watchers, that means all timers, I/O watchers etc. are active in both
		2584	parent and child, which is almost never what you want. USing C<exec>
		2585	to start worker children from some kind of manage rprocess is usually
		2586	preferred, because it is much easier and cleaner, at the expense of having
		2587	to have another binary.
2516		2588
2517		2589
2518	=head1 SECURITY CONSIDERATIONS	2590	=head1 SECURITY CONSIDERATIONS
2519		2591
2520	AnyEvent can be forced to load any event model via	2592	AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.279 by root, Sun Aug 9 16:05:11 2009 UTC vs. Revision 1.314 by root, Fri Mar 12 23:30:06 2010 UTC

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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.279 by root, Sun Aug 9 16:05:11 2009 UTC vs.
Revision 1.314 by root, Fri Mar 12 23:30:06 2010 UTC