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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.180 by root, Sat Sep 6 07:00:45 2008 UTC vs.
Revision 1.195 by root, Wed Mar 25 17:33:11 2009 UTC

…		…
340	=head2 CHILD PROCESS WATCHERS	340	=head2 CHILD PROCESS WATCHERS
341		341
342	You can also watch on a child process exit and catch its exit status.	342	You can also watch on a child process exit and catch its exit status.
343		343
344	The child process is specified by the C<pid> argument (if set to C<0>, it	344	The child process is specified by the C<pid> argument (if set to C<0>, it
345	watches for any child process exit). The watcher will trigger as often	345	watches for any child process exit). The watcher will triggered only when
346	as status change for the child are received. This works by installing a	346	the child process has finished and an exit status is available, not on
347	signal handler for C<SIGCHLD>. The callback will be called with the pid	347	any trace events (stopped/continued).
348	and exit status (as returned by waitpid), so unlike other watcher types,	348
349	you I<can> rely on child watcher callback arguments.	349	The callback will be called with the pid and exit status (as returned by
		350	waitpid), so unlike other watcher types, you I<can> rely on child watcher
		351	callback arguments.
		352
		353	This watcher type works by installing a signal handler for C<SIGCHLD>,
		354	and since it cannot be shared, nothing else should use SIGCHLD or reap
		355	random child processes (waiting for specific child processes, e.g. inside
		356	C<system>, is just fine).
350		357
351	There is a slight catch to child watchers, however: you usually start them	358	There is a slight catch to child watchers, however: you usually start them
352	I<after> the child process was created, and this means the process could	359	I<after> the child process was created, and this means the process could
353	have exited already (and no SIGCHLD will be sent anymore).	360	have exited already (and no SIGCHLD will be sent anymore).
354		361
…		…
818	=item L<AnyEvent::IGS>	825	=item L<AnyEvent::IGS>
819		826
820	A non-blocking interface to the Internet Go Server protocol (used by	827	A non-blocking interface to the Internet Go Server protocol (used by
821	L<App::IGS>).	828	L<App::IGS>).
822		829
823	=item L<Net::IRC3>	830	=item L<AnyEvent::IRC>
824		831
825	AnyEvent based IRC client module family.	832	AnyEvent based IRC client module family (replacing the older Net::IRC3).
826		833
827	=item L<Net::XMPP2>	834	=item L<Net::XMPP2>
828		835
829	AnyEvent based XMPP (Jabber protocol) module family.	836	AnyEvent based XMPP (Jabber protocol) module family.
830		837
…		…
854	no warnings;	861	no warnings;
855	use strict qw(vars subs);	862	use strict qw(vars subs);
856		863
857	use Carp;	864	use Carp;
858		865
859	our $VERSION = 4.233;	866	our $VERSION = 4.341;
860	our $MODEL;	867	our $MODEL;
861		868
862	our $AUTOLOAD;	869	our $AUTOLOAD;
863	our @ISA;	870	our @ISA;
864		871
…		…
997	# to support binding more than one watcher per filehandle (they usually	1004	# to support binding more than one watcher per filehandle (they usually
998	# allow only one watcher per fd, so we dup it to get a different one).	1005	# allow only one watcher per fd, so we dup it to get a different one).
999	sub _dupfh($$$$) {	1006	sub _dupfh($$$$) {
1000	my ($poll, $fh, $r, $w) = @_;	1007	my ($poll, $fh, $r, $w) = @_;
1001		1008
1002	require Fcntl;
1003
1004	# cygwin requires the fh mode to be matching, unix doesn't	1009	# cygwin requires the fh mode to be matching, unix doesn't
1005	my ($rw, $mode) = $poll eq "r" ? ($r, "<")	1010	my ($rw, $mode) = $poll eq "r" ? ($r, "<")
1006	: $poll eq "w" ? ($w, ">")	1011	: $poll eq "w" ? ($w, ">")
1007	: Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'";	1012	: Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'";
1008		1013
…		…
1021	BEGIN {	1026	BEGIN {
1022	if (eval "use Time::HiRes (); time (); 1") {	1027	if (eval "use Time::HiRes (); time (); 1") {
1023	*_time = \&Time::HiRes::time;	1028	*_time = \&Time::HiRes::time;
1024	# if (eval "use POSIX (); (POSIX::times())...	1029	# if (eval "use POSIX (); (POSIX::times())...
1025	} else {	1030	} else {
1026	*_time = \&CORE::time; # epic fail	1031	*_time = sub { time }; # epic fail
1027	}	1032	}
1028	}	1033	}
1029		1034
1030	sub time { _time }	1035	sub time { _time }
1031	sub now { _time }	1036	sub now { _time }
…		…
1036	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar::	1041	bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar::
1037	}	1042	}
1038		1043
1039	# default implementation for ->signal	1044	# default implementation for ->signal
1040		1045
1041	our %SIG_CB;	1046	our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
		1047
		1048	sub _signal_exec {
		1049	while (%SIG_EV) {
		1050	sysread $SIGPIPE_R, my $dummy, 4;
		1051	for (keys %SIG_EV) {
		1052	delete $SIG_EV{$_};
		1053	$_->() for values %{ $SIG_CB{$_} \|\| {} };
		1054	}
		1055	}
		1056	}
1042		1057
1043	sub signal {	1058	sub signal {
1044	my (undef, %arg) = @_;	1059	my (undef, %arg) = @_;
1045		1060
		1061	unless ($SIGPIPE_R) {
		1062	if (AnyEvent::WIN32) {
		1063	($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
		1064	AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
		1065	AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
		1066	} else {
		1067	pipe $SIGPIPE_R, $SIGPIPE_W;
		1068	require Fcntl;
		1069	fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
		1070	fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
		1071	}
		1072
		1073	$SIGPIPE_R
		1074	or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
		1075
		1076	$SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
		1077	}
		1078
1046	my $signal = uc $arg{signal}	1079	my $signal = uc $arg{signal}
1047	or Carp::croak "required option 'signal' is missing";	1080	or Carp::croak "required option 'signal' is missing";
1048		1081
1049	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};	1082	$SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1050	$SIG{$signal} \|\|= sub {	1083	$SIG{$signal} \|\|= sub {
1051	$_->() for values %{ $SIG_CB{$signal} \|\| {} };	1084	syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
		1085	undef $SIG_EV{$signal};
1052	};	1086	};
1053		1087
1054	bless [$signal, $arg{cb}], "AnyEvent::Base::Signal"	1088	bless [$signal, $arg{cb}], "AnyEvent::Base::Signal"
1055	}	1089	}
1056		1090
…		…
1256	used, and preference will be given to protocols mentioned earlier in the	1290	used, and preference will be given to protocols mentioned earlier in the
1257	list.	1291	list.
1258		1292
1259	This variable can effectively be used for denial-of-service attacks	1293	This variable can effectively be used for denial-of-service attacks
1260	against local programs (e.g. when setuid), although the impact is likely	1294	against local programs (e.g. when setuid), although the impact is likely
1261	small, as the program has to handle connection errors already-	1295	small, as the program has to handle conenction and other failures anyways.
1262		1296
1263	Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6,	1297	Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6,
1264	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>	1298	but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1265	- only support IPv4, never try to resolve or contact IPv6	1299	- only support IPv4, never try to resolve or contact IPv6
1266	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or	1300	addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
…		…
1526	watcher.	1560	watcher.
1527		1561
1528	=head3 Results	1562	=head3 Results
1529		1563
1530	name watchers bytes create invoke destroy comment	1564	name watchers bytes create invoke destroy comment
1531	EV/EV 400000 244 0.56 0.46 0.31 EV native interface	1565	EV/EV 400000 224 0.47 0.35 0.27 EV native interface
1532	EV/Any 100000 244 2.50 0.46 0.29 EV + AnyEvent watchers	1566	EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers
1533	CoroEV/Any 100000 244 2.49 0.44 0.29 coroutines + Coro::Signal	1567	CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal
1534	Perl/Any 100000 513 4.92 0.87 1.12 pure perl implementation	1568	Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation
1535	Event/Event 16000 516 31.88 31.30 0.85 Event native interface	1569	Event/Event 16000 517 32.20 31.80 0.81 Event native interface
1536	Event/Any 16000 590 35.75 31.42 1.08 Event + AnyEvent watchers	1570	Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers
1537	Glib/Any 16000 1357 98.22 12.41 54.00 quadratic behaviour	1571	Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour
1538	Tk/Any 2000 1860 26.97 67.98 14.00 SEGV with >> 2000 watchers	1572	Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers
1539	POE/Event 2000 6644 108.64 736.02 14.73 via POE::Loop::Event	1573	POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event
1540	POE/Select 2000 6343 94.13 809.12 565.96 via POE::Loop::Select	1574	POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select
1541		1575
1542	=head3 Discussion	1576	=head3 Discussion
1543		1577
1544	The benchmark does I<not> measure scalability of the event loop very	1578	The benchmark does I<not> measure scalability of the event loop very
1545	well. For example, a select-based event loop (such as the pure perl one)	1579	well. For example, a select-based event loop (such as the pure perl one)
…		…
1747	watchers, as the management overhead dominates.	1781	watchers, as the management overhead dominates.
1748		1782
1749	=back	1783	=back
1750		1784
1751		1785
		1786	=head1 SIGNALS
		1787
		1788	AnyEvent currently installs handlers for these signals:
		1789
		1790	=over 4
		1791
		1792	=item SIGCHLD
		1793
		1794	A handler for C<SIGCHLD> is installed by AnyEvent's child watcher
		1795	emulation for event loops that do not support them natively. Also, some
		1796	event loops install a similar handler.
		1797
		1798	=item SIGPIPE
		1799
		1800	A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef>
		1801	when AnyEvent gets loaded.
		1802
		1803	The rationale for this is that AnyEvent users usually do not really depend
		1804	on SIGPIPE delivery (which is purely an optimisation for shell use, or
		1805	badly-written programs), but C<SIGPIPE> can cause spurious and rare
		1806	program exits as a lot of people do not expect C<SIGPIPE> when writing to
		1807	some random socket.
		1808
		1809	The rationale for installing a no-op handler as opposed to ignoring it is
		1810	that this way, the handler will be restored to defaults on exec.
		1811
		1812	Feel free to install your own handler, or reset it to defaults.
		1813
		1814	=back
		1815
		1816	=cut
		1817
		1818	$SIG{PIPE} = sub { }
		1819	unless defined $SIG{PIPE};
		1820
		1821
1752	=head1 FORK	1822	=head1 FORK
1753		1823
1754	Most event libraries are not fork-safe. The ones who are usually are	1824	Most event libraries are not fork-safe. The ones who are usually are
1755	because they rely on inefficient but fork-safe C<select> or C<poll>	1825	because they rely on inefficient but fork-safe C<select> or C<poll>
1756	calls. Only L<EV> is fully fork-aware.	1826	calls. Only L<EV> is fully fork-aware.

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.180 by root, Sat Sep 6 07:00:45 2008 UTC vs. Revision 1.195 by root, Wed Mar 25 17:33:11 2009 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.180 by root, Sat Sep 6 07:00:45 2008 UTC vs.
Revision 1.195 by root, Wed Mar 25 17:33:11 2009 UTC