[ViewVC] Diff of: cvs/cvsroot/AnyEvent-MP/MP.pm

Comparing cvsroot/AnyEvent-MP/MP.pm (file contents):
Revision 1.127 by root, Sat Mar 3 20:35:10 2012 UTC vs.
Revision 1.143 by root, Fri Mar 23 17:54:36 2012 UTC

…		…
35	# destroy a port again	35	# destroy a port again
36	kil $port; # "normal" kill	36	kil $port; # "normal" kill
37	kil $port, my_error => "everything is broken"; # error kill	37	kil $port, my_error => "everything is broken"; # error kill
38		38
39	# monitoring	39	# monitoring
40	mon $localport, $cb->(@msg) # callback is invoked on death	40	mon $port, $cb->(@msg) # callback is invoked on death
41	mon $localport, $otherport # kill otherport on abnormal death	41	mon $port, $localport # kill localport on abnormal death
42	mon $localport, $otherport, @msg # send message on death	42	mon $port, $localport, @msg # send message on death
43		43
44	# temporarily execute code in port context	44	# temporarily execute code in port context
45	peval $port, sub { die "kill the port!" };	45	peval $port, sub { die "kill the port!" };
46		46
47	# execute callbacks in $SELF port context	47	# execute callbacks in $SELF port context
48	my $timer = AE::timer 1, 0, psub {	48	my $timer = AE::timer 1, 0, psub {
49	die "kill the port, delayed";	49	die "kill the port, delayed";
50	};	50	};
51		51
52	=head1 CURRENT STATUS	52	# distributed database - modification
		53	db_set $family => $subkey [=> $value] # add a subkey
		54	db_del $family => $subkey... # delete one or more subkeys
		55	db_reg $family => $port [=> $value] # register a port
53		56
54	bin/aemp - stable.	57	# distributed database - queries
55	AnyEvent::MP - stable API, should work.	58	db_family $family => $cb->(\%familyhash)
56	AnyEvent::MP::Intro - explains most concepts.	59	db_keys $family => $cb->(\@keys)
57	AnyEvent::MP::Kernel - mostly stable API.	60	db_values $family => $cb->(\@values)
58	AnyEvent::MP::Global - stable API.	61
		62	# distributed database - monitoring a family
		63	db_mon $family => $cb->(\%familyhash, \@added, \@changed, \@deleted)
59		64
60	=head1 DESCRIPTION	65	=head1 DESCRIPTION
61		66
62	This module (-family) implements a simple message passing framework.	67	This module (-family) implements a simple message passing framework.
63		68
…		…
184		189
185	use common::sense;	190	use common::sense;
186		191
187	use Carp ();	192	use Carp ();
188		193
189	use AE ();	194	use AnyEvent ();
190	use Guard ();	195	use Guard ();
191		196
192	use base "Exporter";	197	use base "Exporter";
193		198
194	our $VERSION = $AnyEvent::MP::Config::VERSION;	199	our $VERSION = $AnyEvent::MP::Config::VERSION;
…		…
197	NODE $NODE *SELF node_of after	202	NODE $NODE *SELF node_of after
198	configure	203	configure
199	snd rcv mon mon_guard kil psub peval spawn cal	204	snd rcv mon mon_guard kil psub peval spawn cal
200	port	205	port
201	db_set db_del db_reg	206	db_set db_del db_reg
		207	db_mon db_family db_keys db_values
202	);	208	);
203		209
204	our $SELF;	210	our $SELF;
205		211
206	sub _self_die() {	212	sub _self_die() {
…		…
245	=item force => $boolean (default false)	251	=item force => $boolean (default false)
246		252
247	IF true, then the values specified in the C<configure> will take	253	IF true, then the values specified in the C<configure> will take
248	precedence over any values configured via the rc file. The default is for	254	precedence over any values configured via the rc file. The default is for
249	the rc file to override any options specified in the program.	255	the rc file to override any options specified in the program.
250
251	=item secure => $pass->($nodeid)
252
253	In addition to specifying a boolean, you can specify a code reference that
254	is called for every remote execution attempt - the execution request is
255	granted iff the callback returns a true value.
256
257	See F<semp setsecure> for more info.
258		256
259	=back	257	=back
260		258
261	=over 4	259	=over 4
262		260
…		…
397		395
398	=cut	396	=cut
399		397
400	sub rcv($@);	398	sub rcv($@);
401		399
402	sub _kilme {	400	my $KILME = sub {
403	die "received message on port without callback";	401	(my $tag = substr $_[0], 0, 30) =~ s/([\x20-\x7e])/./g;
404	}	402	kil $SELF, unhandled_message => "no callback found for message '$tag'";
		403	};
405		404
406	sub port(;&) {	405	sub port(;&) {
407	my $id = $UNIQ . ++$ID;	406	my $id = $UNIQ . ++$ID;
408	my $port = "$NODE#$id";	407	my $port = "$NODE#$id";
409		408
410	rcv $port, shift \|\| \&_kilme;	409	rcv $port, shift \|\| $KILME;
411		410
412	$port	411	$port
413	}	412	}
414		413
415	=item rcv $local_port, $callback->(@msg)	414	=item rcv $local_port, $callback->(@msg)
…		…
420		419
421	The global C<$SELF> (exported by this module) contains C<$port> while	420	The global C<$SELF> (exported by this module) contains C<$port> while
422	executing the callback. Runtime errors during callback execution will	421	executing the callback. Runtime errors during callback execution will
423	result in the port being C<kil>ed.	422	result in the port being C<kil>ed.
424		423
425	The default callback received all messages not matched by a more specific	424	The default callback receives all messages not matched by a more specific
426	C<tag> match.	425	C<tag> match.
427		426
428	=item rcv $local_port, tag => $callback->(@msg_without_tag), ...	427	=item rcv $local_port, tag => $callback->(@msg_without_tag), ...
429		428
430	Register (or replace) callbacks to be called on messages starting with the	429	Register (or replace) callbacks to be called on messages starting with the
…		…
594	$res	593	$res
595	}	594	}
596	}	595	}
597	}	596	}
598		597
		598	=item $guard = mon $port, $rcvport # kill $rcvport when $port dies
		599
		600	=item $guard = mon $port # kill $SELF when $port dies
		601
599	=item $guard = mon $port, $cb->(@reason) # call $cb when $port dies	602	=item $guard = mon $port, $cb->(@reason) # call $cb when $port dies
600
601	=item $guard = mon $port, $rcvport # kill $rcvport when $port dies
602
603	=item $guard = mon $port # kill $SELF when $port dies
604		603
605	=item $guard = mon $port, $rcvport, @msg # send a message when $port dies	604	=item $guard = mon $port, $rcvport, @msg # send a message when $port dies
606		605
607	Monitor the given port and do something when the port is killed or	606	Monitor the given port and do something when the port is killed or
608	messages to it were lost, and optionally return a guard that can be used	607	messages to it were lost, and optionally return a guard that can be used
609	to stop monitoring again.	608	to stop monitoring again.
610		609
		610	The first two forms distinguish between "normal" and "abnormal" kil's:
		611
		612	In the first form (another port given), if the C<$port> is C<kil>'ed with
		613	a non-empty reason, the other port (C<$rcvport>) will be kil'ed with the
		614	same reason. That is, on "normal" kil's nothing happens, while under all
		615	other conditions, the other port is killed with the same reason.
		616
		617	The second form (kill self) is the same as the first form, except that
		618	C<$rvport> defaults to C<$SELF>.
		619
		620	The remaining forms don't distinguish between "normal" and "abnormal" kil's
		621	- it's up to the callback or receiver to check whether the C<@reason> is
		622	empty and act accordingly.
		623
611	In the first form (callback), the callback is simply called with any	624	In the third form (callback), the callback is simply called with any
612	number of C<@reason> elements (no @reason means that the port was deleted	625	number of C<@reason> elements (empty @reason means that the port was deleted
613	"normally"). Note also that I<< the callback B<must> never die >>, so use	626	"normally"). Note also that I<< the callback B<must> never die >>, so use
614	C<eval> if unsure.	627	C<eval> if unsure.
615		628
616	In the second form (another port given), the other port (C<$rcvport>)
617	will be C<kil>'ed with C<@reason>, if a @reason was specified, i.e. on
618	"normal" kils nothing happens, while under all other conditions, the other
619	port is killed with the same reason.
620
621	The third form (kill self) is the same as the second form, except that
622	C<$rvport> defaults to C<$SELF>.
623
624	In the last form (message), a message of the form C<@msg, @reason> will be	629	In the last form (message), a message of the form C<$rcvport, @msg,
625	C<snd>.	630	@reason> will be C<snd>.
626		631
627	Monitoring-actions are one-shot: once messages are lost (and a monitoring	632	Monitoring-actions are one-shot: once messages are lost (and a monitoring
628	alert was raised), they are removed and will not trigger again.	633	alert was raised), they are removed and will not trigger again, even if it
		634	turns out that the port is still alive.
629		635
630	As a rule of thumb, monitoring requests should always monitor a port from	636	As a rule of thumb, monitoring requests should always monitor a remote
631	a local port (or callback). The reason is that kill messages might get	637	port locally (using a local C<$rcvport> or a callback). The reason is that
632	lost, just like any other message. Another less obvious reason is that	638	kill messages might get lost, just like any other message. Another less
633	even monitoring requests can get lost (for example, when the connection	639	obvious reason is that even monitoring requests can get lost (for example,
634	to the other node goes down permanently). When monitoring a port locally	640	when the connection to the other node goes down permanently). When
635	these problems do not exist.	641	monitoring a port locally these problems do not exist.
636		642
637	C<mon> effectively guarantees that, in the absence of hardware failures,	643	C<mon> effectively guarantees that, in the absence of hardware failures,
638	after starting the monitor, either all messages sent to the port will	644	after starting the monitor, either all messages sent to the port will
639	arrive, or the monitoring action will be invoked after possible message	645	arrive, or the monitoring action will be invoked after possible message
640	loss has been detected. No messages will be lost "in between" (after	646	loss has been detected. No messages will be lost "in between" (after
…		…
731	will be reported as reason C<< die => $@ >>.	737	will be reported as reason C<< die => $@ >>.
732		738
733	Transport/communication errors are reported as C<< transport_error =>	739	Transport/communication errors are reported as C<< transport_error =>
734	$message >>.	740	$message >>.
735		741
736	=cut	742	Common idioms:
		743
		744	# silently remove yourself, do not kill linked ports
		745	kil $SELF;
		746
		747	# report a failure in some detail
		748	kil $SELF, failure_mode_1 => "it failed with too high temperature";
		749
		750	# do not waste much time with killing, just die when something goes wrong
		751	open my $fh, "<file"
		752	or die "file: $!";
737		753
738	=item $port = spawn $node, $initfunc[, @initdata]	754	=item $port = spawn $node, $initfunc[, @initdata]
739		755
740	Creates a port on the node C<$node> (which can also be a port ID, in which	756	Creates a port on the node C<$node> (which can also be a port ID, in which
741	case it's the node where that port resides).	757	case it's the node where that port resides).
…		…
833	ref $action[0]	849	ref $action[0]
834	? $action[0]()	850	? $action[0]()
835	: snd @action;	851	: snd @action;
836	};	852	};
837	}	853	}
		854
		855	#=item $cb2 = timeout $seconds, $cb[, @args]
838		856
839	=item cal $port, @msg, $callback[, $timeout]	857	=item cal $port, @msg, $callback[, $timeout]
840		858
841	A simple form of RPC - sends a message to the given C<$port> with the	859	A simple form of RPC - sends a message to the given C<$port> with the
842	given contents (C<@msg>), but adds a reply port to the message.	860	given contents (C<@msg>), but adds a reply port to the message.
…		…
891	=back	909	=back
892		910
893	=head1 DISTRIBUTED DATABASE	911	=head1 DISTRIBUTED DATABASE
894		912
895	AnyEvent::MP comes with a simple distributed database. The database will	913	AnyEvent::MP comes with a simple distributed database. The database will
896	be mirrored asynchronously at all global nodes. Other nodes bind to one of	914	be mirrored asynchronously on all global nodes. Other nodes bind to one
897	the global nodes for their needs.	915	of the global nodes for their needs. Every node has a "local database"
		916	which contains all the values that are set locally. All local databases
		917	are merged together to form the global database, which can be queried.
898		918
899	The database consists of a two-level hash - a hash contains a hash which	919	The database structure is that of a two-level hash - the database hash
900	contains values.	920	contains hashes which contain values, similarly to a perl hash of hashes,
		921	i.e.:
		922
		923	$DATABASE{$family}{$subkey} = $value
901		924
902	The top level hash key is called "family", and the second-level hash key	925	The top level hash key is called "family", and the second-level hash key
903	is called "subkey" or simply "key".	926	is called "subkey" or simply "key".
904		927
905	The family must be alphanumeric, i.e. start with a letter and consist	928	The family must be alphanumeric, i.e. start with a letter and consist
…		…
910	with the name of the application or module using it.	933	with the name of the application or module using it.
911		934
912	The subkeys must be non-empty strings, with no further restrictions.	935	The subkeys must be non-empty strings, with no further restrictions.
913		936
914	The values should preferably be strings, but other perl scalars should	937	The values should preferably be strings, but other perl scalars should
915	work as well (such as undef, arrays and hashes).	938	work as well (such as C<undef>, arrays and hashes).
916		939
917	Every database entry is owned by one node - adding the same family/subkey	940	Every database entry is owned by one node - adding the same family/subkey
918	combination on multiple nodes will not cause discomfort for AnyEvent::MP,	941	combination on multiple nodes will not cause discomfort for AnyEvent::MP,
919	but the result might be nondeterministic, i.e. the key might have	942	but the result might be nondeterministic, i.e. the key might have
920	different values on different nodes.	943	different values on different nodes.
…		…
924	pools. For example, a worker port for image scaling might do this:	947	pools. For example, a worker port for image scaling might do this:
925		948
926	db_set my_image_scalers => $port;	949	db_set my_image_scalers => $port;
927		950
928	And clients looking for an image scaler will want to get the	951	And clients looking for an image scaler will want to get the
929	C<my_image_scalers> keys:	952	C<my_image_scalers> keys from time to time:
930		953
931	db_keys "my_image_scalers" => 60 => sub {	954	db_keys my_image_scalers => sub {
932	#d##TODO#	955	@ports = @{ $_[0] };
		956	};
		957
		958	Or better yet, they want to monitor the database family, so they always
		959	have a reasonable up-to-date copy:
		960
		961	db_mon my_image_scalers => sub {
		962	@ports = keys %{ $_[0] };
		963	};
		964
		965	In general, you can set or delete single subkeys, but query and monitor
		966	whole families only.
		967
		968	If you feel the need to monitor or query a single subkey, try giving it
		969	it's own family.
933		970
934	=over	971	=over
935		972
936	=item db_set $family => $subkey [=> $value]	973	=item $guard = db_set $family => $subkey [=> $value]
937		974
938	Sets (or replaces) a key to the database - if C<$value> is omitted,	975	Sets (or replaces) a key to the database - if C<$value> is omitted,
939	C<undef> is used instead.	976	C<undef> is used instead.
940		977
		978	When called in non-void context, C<db_set> returns a guard that
		979	automatically calls C<db_del> when it is destroyed.
		980
941	=item db_del $family => $subkey	981	=item db_del $family => $subkey...
942		982
943	Deletes a key from the database.	983	Deletes one or more subkeys from the database family.
944		984
945	=item $guard = db_reg $family => $subkey [=> $value]	985	=item $guard = db_reg $family => $port => $value
946		986
947	Sets the key on the database and returns a guard. When the guard is	987	=item $guard = db_reg $family => $port
948	destroyed, the key is deleted from the database. If C<$value> is missing,	988
949	then C<undef> is used.	989	=item $guard = db_reg $family
		990
		991	Registers a port in the given family and optionally returns a guard to
		992	remove it.
		993
		994	This function basically does the same as:
		995
		996	db_set $family => $port => $value
		997
		998	Except that the port is monitored and automatically removed from the
		999	database family when it is kil'ed.
		1000
		1001	If C<$value> is missing, C<undef> is used. If C<$port> is missing, then
		1002	C<$SELF> is used.
		1003
		1004	This function is most useful to register a port in some port group (which
		1005	is just another name for a database family), and have it removed when the
		1006	port is gone. This works best when the port is a local port.
		1007
		1008	=cut
		1009
		1010	sub db_reg($$;$) {
		1011	my $family = shift;
		1012	my $port = @_ ? shift : $SELF;
		1013
		1014	my $clr = sub { db_del $family => $port };
		1015	mon $port, $clr;
		1016
		1017	db_set $family => $port => $_[0];
		1018
		1019	defined wantarray
		1020	and &Guard::guard ($clr)
		1021	}
		1022
		1023	=item db_family $family => $cb->(\%familyhash)
		1024
		1025	Queries the named database C<$family> and call the callback with the
		1026	family represented as a hash. You can keep and freely modify the hash.
		1027
		1028	=item db_keys $family => $cb->(\@keys)
		1029
		1030	Same as C<db_family>, except it only queries the family I<subkeys> and passes
		1031	them as array reference to the callback.
		1032
		1033	=item db_values $family => $cb->(\@values)
		1034
		1035	Same as C<db_family>, except it only queries the family I<values> and passes them
		1036	as array reference to the callback.
		1037
		1038	=item $guard = db_mon $family => $cb->(\%familyhash, \@added, \@changed, \@deleted)
		1039
		1040	Creates a monitor on the given database family. Each time a key is set
		1041	or or is deleted the callback is called with a hash containing the
		1042	database family and three lists of added, changed and deleted subkeys,
		1043	respectively. If no keys have changed then the array reference might be
		1044	C<undef> or even missing.
		1045
		1046	If not called in void context, a guard object is returned that, when
		1047	destroyed, stops the monitor.
		1048
		1049	The family hash reference and the key arrays belong to AnyEvent::MP and
		1050	B<must not be modified or stored> by the callback. When in doubt, make a
		1051	copy.
		1052
		1053	As soon as possible after the monitoring starts, the callback will be
		1054	called with the intiial contents of the family, even if it is empty,
		1055	i.e. there will always be a timely call to the callback with the current
		1056	contents.
		1057
		1058	It is possible that the callback is called with a change event even though
		1059	the subkey is already present and the value has not changed.
		1060
		1061	The monitoring stops when the guard object is destroyed.
		1062
		1063	Example: on every change to the family "mygroup", print out all keys.
		1064
		1065	my $guard = db_mon mygroup => sub {
		1066	my ($family, $a, $c, $d) = @_;
		1067	print "mygroup members: ", (join " ", keys %$family), "\n";
		1068	};
		1069
		1070	Exmaple: wait until the family "My::Module::workers" is non-empty.
		1071
		1072	my $guard; $guard = db_mon My::Module::workers => sub {
		1073	my ($family, $a, $c, $d) = @_;
		1074	return unless %$family;
		1075	undef $guard;
		1076	print "My::Module::workers now nonempty\n";
		1077	};
		1078
		1079	Example: print all changes to the family "AnyRvent::Fantasy::Module".
		1080
		1081	my $guard = db_mon AnyRvent::Fantasy::Module => sub {
		1082	my ($family, $a, $c, $d) = @_;
		1083
		1084	print "+$_=$family->{$_}\n" for @$a;
		1085	print "*$_=$family->{$_}\n" for @$c;
		1086	print "-$_=$family->{$_}\n" for @$d;
		1087	};
950		1088
951	=cut	1089	=cut
952		1090
953	=back	1091	=back
954		1092
…		…
1113	Keeping your messages simple, concentrating on data structures rather than	1251	Keeping your messages simple, concentrating on data structures rather than
1114	objects, will keep your messages clean, tidy and efficient.	1252	objects, will keep your messages clean, tidy and efficient.
1115		1253
1116	=back	1254	=back
1117		1255
		1256	=head1 PORTING FROM AnyEvent::MP VERSION 1.X
		1257
		1258	AEMP version 2 has a few major incompatible changes compared to version 1:
		1259
		1260	=over 4
		1261
		1262	=item AnyEvent::MP::Global no longer has group management functions.
		1263
		1264	At least not officially - the grp_* functions are still exported and might
		1265	work, but they will be removed in some later release.
		1266
		1267	AnyEvent::MP now comes with a distributed database that is more
		1268	powerful. Its database families map closely to port groups, but the API
		1269	has changed (the functions are also now exported by AnyEvent::MP). Here is
		1270	a rough porting guide:
		1271
		1272	grp_reg $group, $port # old
		1273	db_reg $group, $port # new
		1274
		1275	$list = grp_get $group # old
		1276	db_keys $group, sub { my $list = shift } # new
		1277
		1278	grp_mon $group, $cb->(\@ports, $add, $del) # old
		1279	db_mon $group, $cb->(\%ports, $add, $change, $del) # new
		1280
		1281	C<grp_reg> is a no-brainer (just replace by C<db_reg>), but C<grp_get> is
		1282	no longer instant, because the local node might not have a copy of the
		1283	group. You can either modify your code to allow for a callback, or use
		1284	C<db_mon> to keep an updated copy of the group:
		1285
		1286	my $local_group_copy;
		1287	db_mon $group => sub { $local_group_copy = $_[0] };
		1288
		1289	# now "keys %$local_group_copy" always returns the most up-to-date
		1290	# list of ports in the group.
		1291
		1292	C<grp_mon> can be replaced by C<db_mon> with minor changes - C<db_mon>
		1293	passes a hash as first argument, and an extra C<$chg> argument that can be
		1294	ignored:
		1295
		1296	db_mon $group => sub {
		1297	my ($ports, $add, $chg, $lde) = @_;
		1298	$ports = [keys %$ports];
		1299
		1300	# now $ports, $add and $del are the same as
		1301	# were originally passed by grp_mon.
		1302	...
		1303	};
		1304
		1305	=item Nodes not longer connect to all other nodes.
		1306
		1307	In AEMP 1.x, every node automatically loads the L<AnyEvent::MP::Global>
		1308	module, which in turn would create connections to all other nodes in the
		1309	network (helped by the seed nodes).
		1310
		1311	In version 2.x, global nodes still connect to all other global nodes, but
		1312	other nodes don't - now every node either is a global node itself, or
		1313	attaches itself to another global node.
		1314
		1315	If a node isn't a global node itself, then it attaches itself to one
		1316	of its seed nodes. If that seed node isn't a global node yet, it will
		1317	automatically be upgraded to a global node.
		1318
		1319	So in many cases, nothing needs to be changed - one just has to make sure
		1320	that all seed nodes are meshed together with the other seed nodes (as with
		1321	AEMP 1.x), and other nodes specify them as seed nodes. This is most easily
		1322	achieved by specifying the same set of seed nodes for all nodes in the
		1323	network.
		1324
		1325	Not opening a connection to every other node is usually an advantage,
		1326	except when you need the lower latency of an already established
		1327	connection. To ensure a node establishes a connection to another node,
		1328	you can monitor the node port (C<mon $node, ...>), which will attempt to
		1329	create the connection (and notify you when the connection fails).
		1330
		1331	=item Listener-less nodes (nodes without binds) are gone.
		1332
		1333	And are not coming back, at least not in their old form. If no C<binds>
		1334	are specified for a node, AnyEvent::MP assumes a default of C<:>.
		1335
		1336	There are vague plans to implement some form of routing domains, which
		1337	might or might not bring back listener-less nodes, but don't count on it.
		1338
		1339	The fact that most connections are now optional somewhat mitigates this,
		1340	as a node can be effectively unreachable from the outside without any
		1341	problems, as long as it isn't a global node and only reaches out to other
		1342	nodes (as opposed to being contacted from other nodes).
		1343
		1344	=item $AnyEvent::MP::Kernel::WARN has gone.
		1345
		1346	AnyEvent has acquired a logging framework (L<AnyEvent::Log>), and AEMP now
		1347	uses this, and so should your programs.
		1348
		1349	Every module now documents what kinds of messages it generates, with
		1350	AnyEvent::MP acting as a catch all.
		1351
		1352	On the positive side, this means that instead of setting
		1353	C<PERL_ANYEVENT_MP_WARNLEVEL>, you can get away by setting C<AE_VERBOSE> -
		1354	much less to type.
		1355
		1356	=back
		1357
		1358	=head1 LOGGING
		1359
		1360	AnyEvent::MP does not normally log anything by itself, but sinc eit is the
		1361	root of the contetx hierarchy for AnyEvent::MP modules, it will receive
		1362	all log messages by submodules.
		1363
1118	=head1 SEE ALSO	1364	=head1 SEE ALSO
1119		1365
1120	L<AnyEvent::MP::Intro> - a gentle introduction.	1366	L<AnyEvent::MP::Intro> - a gentle introduction.
1121		1367
1122	L<AnyEvent::MP::Kernel> - more, lower-level, stuff.	1368	L<AnyEvent::MP::Kernel> - more, lower-level, stuff.

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Comparing cvsroot/AnyEvent-MP/MP.pm (file contents): Revision 1.127 by root, Sat Mar 3 20:35:10 2012 UTC vs. Revision 1.143 by root, Fri Mar 23 17:54:36 2012 UTC

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Comparing cvsroot/AnyEvent-MP/MP.pm (file contents):
Revision 1.127 by root, Sat Mar 3 20:35:10 2012 UTC vs.
Revision 1.143 by root, Fri Mar 23 17:54:36 2012 UTC