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

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.62 by root, Thu Aug 27 07:12:48 2009 UTC vs.
Revision 1.117 by root, Wed Oct 27 06:32:39 2010 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	AnyEvent::MP - multi-processing/message-passing framework	3	AnyEvent::MP - erlang-style multi-processing/message-passing framework
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use AnyEvent::MP;	7	use AnyEvent::MP;
8		8
9	$NODE # contains this node's noderef	9	$NODE # contains this node's node ID
10	NODE # returns this node's noderef	10	NODE # returns this node's node ID
11	NODE $port # returns the noderef of the port
12		11
13	$SELF # receiving/own port id in rcv callbacks	12	$SELF # receiving/own port id in rcv callbacks
14		13
15	# initialise the node so it can send/receive messages	14	# initialise the node so it can send/receive messages
16	initialise_node; # -OR-	15	configure;
17	initialise_node "localhost:4040"; # -OR-
18	initialise_node "slave/", "localhost:4040"
19		16
20	# ports are message endpoints	17	# ports are message destinations
21		18
22	# sending messages	19	# sending messages
23	snd $port, type => data...;	20	snd $port, type => data...;
24	snd $port, @msg;	21	snd $port, @msg;
25	snd @msg_with_first_element_being_a_port;	22	snd @msg_with_first_element_being_a_port;
26		23
27	# creating/using ports, the simple way	24	# creating/using ports, the simple way
28	my $simple_port = port { my @msg = @_; 0 };	25	my $simple_port = port { my @msg = @_ };
29		26
30	# creating/using ports, tagged message matching	27	# creating/using ports, tagged message matching
31	my $port = port;	28	my $port = port;
32	rcv $port, ping => sub { snd $_[0], "pong"; 0 };	29	rcv $port, ping => sub { snd $_[0], "pong" };
33	rcv $port, pong => sub { warn "pong received\n"; 0 };	30	rcv $port, pong => sub { warn "pong received\n" };
34		31
35	# create a port on another node	32	# create a port on another node
36	my $port = spawn $node, $initfunc, @initdata;	33	my $port = spawn $node, $initfunc, @initdata;
37		34
		35	# destroy a port again
		36	kil $port; # "normal" kill
		37	kil $port, my_error => "everything is broken"; # error kill
		38
38	# monitoring	39	# monitoring
39	mon $port, $cb->(@msg) # callback is invoked on death	40	mon $localport, $cb->(@msg) # callback is invoked on death
40	mon $port, $otherport # kill otherport on abnormal death	41	mon $localport, $otherport # kill otherport on abnormal death
41	mon $port, $otherport, @msg # send message on death	42	mon $localport, $otherport, @msg # send message on death
		43
		44	# temporarily execute code in port context
		45	peval $port, sub { die "kill the port!" };
		46
		47	# execute callbacks in $SELF port context
		48	my $timer = AE::timer 1, 0, psub {
		49	die "kill the port, delayed";
		50	};
42		51
43	=head1 CURRENT STATUS	52	=head1 CURRENT STATUS
44		53
		54	bin/aemp - stable.
45	AnyEvent::MP - stable API, should work	55	AnyEvent::MP - stable API, should work.
46	AnyEvent::MP::Intro - outdated	56	AnyEvent::MP::Intro - explains most concepts.
47	AnyEvent::MP::Kernel - WIP
48	AnyEvent::MP::Transport - mostly stable	57	AnyEvent::MP::Kernel - mostly stable API.
49		58	AnyEvent::MP::Global - stable API.
50	stay tuned.
51		59
52	=head1 DESCRIPTION	60	=head1 DESCRIPTION
53		61
54	This module (-family) implements a simple message passing framework.	62	This module (-family) implements a simple message passing framework.
55		63
56	Despite its simplicity, you can securely message other processes running	64	Despite its simplicity, you can securely message other processes running
57	on the same or other hosts.	65	on the same or other hosts, and you can supervise entities remotely.
58		66
59	For an introduction to this module family, see the L<AnyEvent::MP::Intro>	67	For an introduction to this module family, see the L<AnyEvent::MP::Intro>
60	manual page.	68	manual page and the examples under F<eg/>.
61
62	At the moment, this module family is severly broken and underdocumented,
63	so do not use. This was uploaded mainly to reserve the CPAN namespace -
64	stay tuned!
65		69
66	=head1 CONCEPTS	70	=head1 CONCEPTS
67		71
68	=over 4	72	=over 4
69		73
70	=item port	74	=item port
71		75
72	A port is something you can send messages to (with the C<snd> function).	76	Not to be confused with a TCP port, a "port" is something you can send
		77	messages to (with the C<snd> function).
73		78
74	Ports allow you to register C<rcv> handlers that can match all or just	79	Ports allow you to register C<rcv> handlers that can match all or just
75	some messages. Messages will not be queued.	80	some messages. Messages send to ports will not be queued, regardless of
		81	anything was listening for them or not.
76		82
77	=item port id - C<noderef#portname>	83	=item port ID - C<nodeid#portname>
78		84
79	A port ID is the concatenation of a noderef, a hash-mark (C<#>) as	85	A port ID is the concatenation of a node ID, a hash-mark (C<#>) as
80	separator, and a port name (a printable string of unspecified format). An	86	separator, and a port name (a printable string of unspecified format).
81	exception is the the node port, whose ID is identical to its node
82	reference.
83		87
84	=item node	88	=item node
85		89
86	A node is a single process containing at least one port - the node port,	90	A node is a single process containing at least one port - the node port,
87	which provides nodes to manage each other remotely, and to create new	91	which enables nodes to manage each other remotely, and to create new
88	ports.	92	ports.
89		93
90	Nodes are either private (single-process only), slaves (can only talk to	94	Nodes are either public (have one or more listening ports) or private
91	public nodes, but do not need an open port) or public nodes (connectable	95	(no listening ports). Private nodes cannot talk to other private nodes
92	from any other node).	96	currently.
93		97
94	=item noderef - C<host:port,host:port...>, C<id@noderef>, C<id>	98	=item node ID - C<[A-Za-z0-9_\-.:]*>
95		99
96	A node reference is a string that either simply identifies the node (for	100	A node ID is a string that uniquely identifies the node within a
97	private and slave nodes), or contains a recipe on how to reach a given	101	network. Depending on the configuration used, node IDs can look like a
98	node (for public nodes).	102	hostname, a hostname and a port, or a random string. AnyEvent::MP itself
		103	doesn't interpret node IDs in any way.
99		104
100	This recipe is simply a comma-separated list of C<address:port> pairs (for	105	=item binds - C<ip:port>
101	TCP/IP, other protocols might look different).
102		106
103	Node references come in two flavours: resolved (containing only numerical	107	Nodes can only talk to each other by creating some kind of connection to
104	addresses) or unresolved (where hostnames are used instead of addresses).	108	each other. To do this, nodes should listen on one or more local transport
		109	endpoints - binds. Currently, only standard C<ip:port> specifications can
		110	be used, which specify TCP ports to listen on.
105		111
106	Before using an unresolved node reference in a message you first have to	112	=item seed nodes
107	resolve it.	113
		114	When a node starts, it knows nothing about the network. To teach the node
		115	about the network it first has to contact some other node within the
		116	network. This node is called a seed.
		117
		118	Apart from the fact that other nodes know them as seed nodes and they have
		119	to have fixed listening addresses, seed nodes are perfectly normal nodes -
		120	any node can function as a seed node for others.
		121
		122	In addition to discovering the network, seed nodes are also used to
		123	maintain the network and to connect nodes that otherwise would have
		124	trouble connecting. They form the backbone of an AnyEvent::MP network.
		125
		126	Seed nodes are expected to be long-running, and at least one seed node
		127	should always be available. They should also be relatively responsive - a
		128	seed node that blocks for long periods will slow down everybody else.
		129
		130	=item seeds - C<host:port>
		131
		132	Seeds are transport endpoint(s) (usually a hostname/IP address and a
		133	TCP port) of nodes that should be used as seed nodes.
		134
		135	The nodes listening on those endpoints are expected to be long-running,
		136	and at least one of those should always be available. When nodes run out
		137	of connections (e.g. due to a network error), they try to re-establish
		138	connections to some seednodes again to join the network.
108		139
109	=back	140	=back
110		141
111	=head1 VARIABLES/FUNCTIONS	142	=head1 VARIABLES/FUNCTIONS
112		143
124		155
125	use AE ();	156	use AE ();
126		157
127	use base "Exporter";	158	use base "Exporter";
128		159
129	our $VERSION = $AnyEvent::MP::Kernel::VERSION;	160	our $VERSION = 1.29;
130		161
131	our @EXPORT = qw(	162	our @EXPORT = qw(
132	NODE $NODE *SELF node_of after	163	NODE $NODE *SELF node_of after
133	resolve_node initialise_node	164	configure
134	snd rcv mon mon_guard kil reg psub spawn	165	snd rcv mon mon_guard kil psub peval spawn cal
135	port	166	port
136	);	167	);
137		168
138	our $SELF;	169	our $SELF;
139		170
…		…
143	kil $SELF, die => $msg;	174	kil $SELF, die => $msg;
144	}	175	}
145		176
146	=item $thisnode = NODE / $NODE	177	=item $thisnode = NODE / $NODE
147		178
148	The C<NODE> function returns, and the C<$NODE> variable contains the	179	The C<NODE> function returns, and the C<$NODE> variable contains, the node
149	noderef of the local node. The value is initialised by a call to	180	ID of the node running in the current process. This value is initialised by
150	C<initialise_node>.	181	a call to C<configure>.
151		182
152	=item $noderef = node_of $port	183	=item $nodeid = node_of $port
153		184
154	Extracts and returns the noderef from a port ID or a noderef.	185	Extracts and returns the node ID from a port ID or a node ID.
155		186
156	=item initialise_node $noderef, $seednode, $seednode...	187	=item configure $profile, key => value...
157		188
158	=item initialise_node "slave/", $master, $master...	189	=item configure key => value...
159		190
160	Before a node can talk to other nodes on the network it has to initialise	191	Before a node can talk to other nodes on the network (i.e. enter
161	itself - the minimum a node needs to know is it's own name, and optionally	192	"distributed mode") it has to configure itself - the minimum a node needs
162	it should know the noderefs of some other nodes in the network.	193	to know is its own name, and optionally it should know the addresses of
		194	some other nodes in the network to discover other nodes.
163		195
		196	The key/value pairs are basically the same ones as documented for the
		197	F<aemp> command line utility (sans the set/del prefix).
		198
164	This function initialises a node - it must be called exactly once (or	199	This function configures a node - it must be called exactly once (or
165	never) before calling other AnyEvent::MP functions.	200	never) before calling other AnyEvent::MP functions.
166		201
167	All arguments (optionally except for the first) are noderefs, which can be
168	either resolved or unresolved.
169
170	The first argument will be looked up in the configuration database first
171	(if it is C<undef> then the current nodename will be used instead) to find
172	the relevant configuration profile (see L<aemp>). If none is found then
173	the default configuration is used. The configuration supplies additional
174	seed/master nodes and can override the actual noderef.
175
176	There are two types of networked nodes, public nodes and slave nodes:
177
178	=over 4	202	=over 4
179		203
180	=item public nodes	204	=item step 1, gathering configuration from profiles
181		205
182	For public nodes, C<$noderef> (supplied either directly to	206	The function first looks up a profile in the aemp configuration (see the
183	C<initialise_node> or indirectly via a profile or the nodename) must be a	207	L<aemp> commandline utility). The profile name can be specified via the
184	noderef (possibly unresolved, in which case it will be resolved).	208	named C<profile> parameter or can simply be the first parameter). If it is
		209	missing, then the nodename (F<uname -n>) will be used as profile name.
185		210
186	After resolving, the node will bind itself on all endpoints.	211	The profile data is then gathered as follows:
187		212
188	=item slave nodes	213	First, all remaining key => value pairs (all of which are conveniently
		214	undocumented at the moment) will be interpreted as configuration
		215	data. Then they will be overwritten by any values specified in the global
		216	default configuration (see the F<aemp> utility), then the chain of
		217	profiles chosen by the profile name (and any C<parent> attributes).
189		218
190	When the C<$noderef> (either as given or overriden by the config file)	219	That means that the values specified in the profile have highest priority
191	is the special string C<slave/>, then the node will become a slave	220	and the values specified directly via C<configure> have lowest priority,
192	node. Slave nodes cannot be contacted from outside, and cannot talk to	221	and can only be used to specify defaults.
193	each other (at least in this version of AnyEvent::MP).
194		222
195	Slave nodes work by creating connections to all public nodes, using the	223	If the profile specifies a node ID, then this will become the node ID of
196	L<AnyEvent::MP::Global> service.	224	this process. If not, then the profile name will be used as node ID. The
		225	special node ID of C<anon/> will be replaced by a random node ID.
		226
		227	=item step 2, bind listener sockets
		228
		229	The next step is to look up the binds in the profile, followed by binding
		230	aemp protocol listeners on all binds specified (it is possible and valid
		231	to have no binds, meaning that the node cannot be contacted form the
		232	outside. This means the node cannot talk to other nodes that also have no
		233	binds, but it can still talk to all "normal" nodes).
		234
		235	If the profile does not specify a binds list, then a default of C<*> is
		236	used, meaning the node will bind on a dynamically-assigned port on every
		237	local IP address it finds.
		238
		239	=item step 3, connect to seed nodes
		240
		241	As the last step, the seeds list from the profile is passed to the
		242	L<AnyEvent::MP::Global> module, which will then use it to keep
		243	connectivity with at least one node at any point in time.
197		244
198	=back	245	=back
199		246
200	After initialising itself, the node will connect to all additional	247	Example: become a distributed node using the local node name as profile.
201	C<$seednodes> that are specified diretcly or via a profile. Seednodes are	248	This should be the most common form of invocation for "daemon"-type nodes.
202	optional and can be used to quickly bootstrap the node into an existing
203	network.
204		249
205	All the seednodes will also be specially marked to automatically retry	250	configure
206	connecting to them indefinitely, so make sure that seednodes are really
207	reliable and up (this might also change in the future).
208		251
209	Example: become a public node listening on the guessed noderef, or the one	252	Example: become an anonymous node. This form is often used for commandline
210	specified via C<aemp> for the current node. This should be the most common	253	clients.
211	form of invocation for "daemon"-type nodes.
212		254
213	initialise_node;	255	configure nodeid => "anon/";
214		256
215	Example: become a slave node to any of the the seednodes specified via	257	Example: configure a node using a profile called seed, which si suitable
216	C<aemp>. This form is often used for commandline clients.	258	for a seed node as it binds on all local addresses on a fixed port (4040,
		259	customary for aemp).
217		260
218	initialise_node "slave/";	261	# use the aemp commandline utility
		262	# aemp profile seed nodeid anon/ binds '*:4040'
219		263
220	Example: become a public node, and try to contact some well-known master	264	# then use it
221	servers to become part of the network.	265	configure profile => "seed";
222		266
223	initialise_node undef, "master1", "master2";	267	# or simply use aemp from the shell again:
		268	# aemp run profile seed
224		269
225	Example: become a public node listening on port C<4041>.	270	# or provide a nicer-to-remember nodeid
226		271	# aemp run profile seed nodeid "$(hostname)"
227	initialise_node 4041;
228
229	Example: become a public node, only visible on localhost port 4044.
230
231	initialise_node "localhost:4044";
232
233	=item $cv = resolve_node $noderef
234
235	Takes an unresolved node reference that may contain hostnames and
236	abbreviated IDs, resolves all of them and returns a resolved node
237	reference.
238
239	In addition to C<address:port> pairs allowed in resolved noderefs, the
240	following forms are supported:
241
242	=over 4
243
244	=item the empty string
245
246	An empty-string component gets resolved as if the default port (4040) was
247	specified.
248
249	=item naked port numbers (e.g. C<1234>)
250
251	These are resolved by prepending the local nodename and a colon, to be
252	further resolved.
253
254	=item hostnames (e.g. C<localhost:1234>, C<localhost>)
255
256	These are resolved by using AnyEvent::DNS to resolve them, optionally
257	looking up SRV records for the C<aemp=4040> port, if no port was
258	specified.
259
260	=back
261		272
262	=item $SELF	273	=item $SELF
263		274
264	Contains the current port id while executing C<rcv> callbacks or C<psub>	275	Contains the current port id while executing C<rcv> callbacks or C<psub>
265	blocks.	276	blocks.
266		277
267	=item SELF, %SELF, @SELF...	278	=item *SELF, SELF, %SELF, @SELF...
268		279
269	Due to some quirks in how perl exports variables, it is impossible to	280	Due to some quirks in how perl exports variables, it is impossible to
270	just export C<$SELF>, all the symbols called C<SELF> are exported by this	281	just export C<$SELF>, all the symbols named C<SELF> are exported by this
271	module, but only C<$SELF> is currently used.	282	module, but only C<$SELF> is currently used.
272		283
273	=item snd $port, type => @data	284	=item snd $port, type => @data
274		285
275	=item snd $port, @msg	286	=item snd $port, @msg
276		287
277	Send the given message to the given port ID, which can identify either	288	Send the given message to the given port, which can identify either a
278	a local or a remote port, and must be a port ID.	289	local or a remote port, and must be a port ID.
279		290
280	While the message can be about anything, it is highly recommended to use a	291	While the message can be almost anything, it is highly recommended to
281	string as first element (a port ID, or some word that indicates a request	292	use a string as first element (a port ID, or some word that indicates a
282	type etc.).	293	request type etc.) and to consist if only simple perl values (scalars,
		294	arrays, hashes) - if you think you need to pass an object, think again.
283		295
284	The message data effectively becomes read-only after a call to this	296	The message data logically becomes read-only after a call to this
285	function: modifying any argument is not allowed and can cause many	297	function: modifying any argument (or values referenced by them) is
286	problems.	298	forbidden, as there can be considerable time between the call to C<snd>
		299	and the time the message is actually being serialised - in fact, it might
		300	never be copied as within the same process it is simply handed to the
		301	receiving port.
287		302
288	The type of data you can transfer depends on the transport protocol: when	303	The type of data you can transfer depends on the transport protocol: when
289	JSON is used, then only strings, numbers and arrays and hashes consisting	304	JSON is used, then only strings, numbers and arrays and hashes consisting
290	of those are allowed (no objects). When Storable is used, then anything	305	of those are allowed (no objects). When Storable is used, then anything
291	that Storable can serialise and deserialise is allowed, and for the local	306	that Storable can serialise and deserialise is allowed, and for the local
292	node, anything can be passed.	307	node, anything can be passed. Best rely only on the common denominator of
		308	these.
293		309
294	=item $local_port = port	310	=item $local_port = port
295		311
296	Create a new local port object and returns its port ID. Initially it has	312	Create a new local port object and returns its port ID. Initially it has
297	no callbacks set and will throw an error when it receives messages.	313	no callbacks set and will throw an error when it receives messages.
…		…
370	msg1 => sub { ... },	386	msg1 => sub { ... },
371	...	387	...
372	;	388	;
373		389
374	Example: temporarily register a rcv callback for a tag matching some port	390	Example: temporarily register a rcv callback for a tag matching some port
375	(e.g. for a rpc reply) and unregister it after a message was received.	391	(e.g. for an rpc reply) and unregister it after a message was received.
376		392
377	rcv $port, $otherport => sub {	393	rcv $port, $otherport => sub {
378	my @reply = @_;	394	my @reply = @_;
379		395
380	rcv $SELF, $otherport;	396	rcv $SELF, $otherport;
…		…
382		398
383	=cut	399	=cut
384		400
385	sub rcv($@) {	401	sub rcv($@) {
386	my $port = shift;	402	my $port = shift;
387	my ($noderef, $portid) = split /#/, $port, 2;	403	my ($nodeid, $portid) = split /#/, $port, 2;
388		404
389	$NODE{$noderef} == $NODE{""}	405	$NODE{$nodeid} == $NODE{""}
390	or Carp::croak "$port: rcv can only be called on local ports, caught";	406	or Carp::croak "$port: rcv can only be called on local ports, caught";
391		407
392	while (@_) {	408	while (@_) {
393	if (ref $_[0]) {	409	if (ref $_[0]) {
394	if (my $self = $PORT_DATA{$portid}) {	410	if (my $self = $PORT_DATA{$portid}) {
395	"AnyEvent::MP::Port" eq ref $self	411	"AnyEvent::MP::Port" eq ref $self
396	or Carp::croak "$port: rcv can only be called on message matching ports, caught";	412	or Carp::croak "$port: rcv can only be called on message matching ports, caught";
397		413
398	$self->[2] = shift;	414	$self->[0] = shift;
399	} else {	415	} else {
400	my $cb = shift;	416	my $cb = shift;
401	$PORT{$portid} = sub {	417	$PORT{$portid} = sub {
402	local $SELF = $port;	418	local $SELF = $port;
403	eval { &$cb }; _self_die if $@;	419	eval { &$cb }; _self_die if $@;
404	};	420	};
405	}	421	}
406	} elsif (defined $_[0]) {	422	} elsif (defined $_[0]) {
407	my $self = $PORT_DATA{$portid} \|\|= do {	423	my $self = $PORT_DATA{$portid} \|\|= do {
408	my $self = bless [$PORT{$port} \|\| sub { }, { }, $port], "AnyEvent::MP::Port";	424	my $self = bless [$PORT{$portid} \|\| sub { }, { }, $port], "AnyEvent::MP::Port";
409		425
410	$PORT{$portid} = sub {	426	$PORT{$portid} = sub {
411	local $SELF = $port;	427	local $SELF = $port;
412		428
413	if (my $cb = $self->[1]{$_[0]}) {	429	if (my $cb = $self->[1]{$_[0]}) {
…		…
435	}	451	}
436		452
437	$port	453	$port
438	}	454	}
439		455
		456	=item peval $port, $coderef[, @args]
		457
		458	Evaluates the given C<$codref> within the contetx of C<$port>, that is,
		459	when the code throews an exception the C<$port> will be killed.
		460
		461	Any remaining args will be passed to the callback. Any return values will
		462	be returned to the caller.
		463
		464	This is useful when you temporarily want to execute code in the context of
		465	a port.
		466
		467	Example: create a port and run some initialisation code in it's context.
		468
		469	my $port = port { ... };
		470
		471	peval $port, sub {
		472	init
		473	or die "unable to init";
		474	};
		475
		476	=cut
		477
		478	sub peval($$) {
		479	local $SELF = shift;
		480	my $cb = shift;
		481
		482	if (wantarray) {
		483	my @res = eval { &$cb };
		484	_self_die if $@;
		485	@res
		486	} else {
		487	my $res = eval { &$cb };
		488	_self_die if $@;
		489	$res
		490	}
		491	}
		492
440	=item $closure = psub { BLOCK }	493	=item $closure = psub { BLOCK }
441		494
442	Remembers C<$SELF> and creates a closure out of the BLOCK. When the	495	Remembers C<$SELF> and creates a closure out of the BLOCK. When the
443	closure is executed, sets up the environment in the same way as in C<rcv>	496	closure is executed, sets up the environment in the same way as in C<rcv>
444	callbacks, i.e. runtime errors will cause the port to get C<kil>ed.	497	callbacks, i.e. runtime errors will cause the port to get C<kil>ed.
		498
		499	The effect is basically as if it returned C<< sub { peval $SELF, sub {
		500	BLOCK }, @_ } >>.
445		501
446	This is useful when you register callbacks from C<rcv> callbacks:	502	This is useful when you register callbacks from C<rcv> callbacks:
447		503
448	rcv delayed_reply => sub {	504	rcv delayed_reply => sub {
449	my ($delay, @reply) = @_;	505	my ($delay, @reply) = @_;
…		…
473	$res	529	$res
474	}	530	}
475	}	531	}
476	}	532	}
477		533
478	=item $guard = mon $port, $cb->(@reason)	534	=item $guard = mon $port, $cb->(@reason) # call $cb when $port dies
479		535
480	=item $guard = mon $port, $rcvport	536	=item $guard = mon $port, $rcvport # kill $rcvport when $port dies
481		537
482	=item $guard = mon $port	538	=item $guard = mon $port # kill $SELF when $port dies
483		539
484	=item $guard = mon $port, $rcvport, @msg	540	=item $guard = mon $port, $rcvport, @msg # send a message when $port dies
485		541
486	Monitor the given port and do something when the port is killed or	542	Monitor the given port and do something when the port is killed or
487	messages to it were lost, and optionally return a guard that can be used	543	messages to it were lost, and optionally return a guard that can be used
488	to stop monitoring again.	544	to stop monitoring again.
489
490	C<mon> effectively guarantees that, in the absence of hardware failures,
491	that after starting the monitor, either all messages sent to the port
492	will arrive, or the monitoring action will be invoked after possible
493	message loss has been detected. No messages will be lost "in between"
494	(after the first lost message no further messages will be received by the
495	port). After the monitoring action was invoked, further messages might get
496	delivered again.
497
498	Note that monitoring-actions are one-shot: once released, they are removed
499	and will not trigger again.
500		545
501	In the first form (callback), the callback is simply called with any	546	In the first form (callback), the callback is simply called with any
502	number of C<@reason> elements (no @reason means that the port was deleted	547	number of C<@reason> elements (no @reason means that the port was deleted
503	"normally"). Note also that I<< the callback B<must> never die >>, so use	548	"normally"). Note also that I<< the callback B<must> never die >>, so use
504	C<eval> if unsure.	549	C<eval> if unsure.
505		550
506	In the second form (another port given), the other port (C<$rcvport>)	551	In the second form (another port given), the other port (C<$rcvport>)
507	will be C<kil>'ed with C<@reason>, iff a @reason was specified, i.e. on	552	will be C<kil>'ed with C<@reason>, if a @reason was specified, i.e. on
508	"normal" kils nothing happens, while under all other conditions, the other	553	"normal" kils nothing happens, while under all other conditions, the other
509	port is killed with the same reason.	554	port is killed with the same reason.
510		555
511	The third form (kill self) is the same as the second form, except that	556	The third form (kill self) is the same as the second form, except that
512	C<$rvport> defaults to C<$SELF>.	557	C<$rvport> defaults to C<$SELF>.
513		558
514	In the last form (message), a message of the form C<@msg, @reason> will be	559	In the last form (message), a message of the form C<@msg, @reason> will be
515	C<snd>.	560	C<snd>.
		561
		562	Monitoring-actions are one-shot: once messages are lost (and a monitoring
		563	alert was raised), they are removed and will not trigger again.
516		564
517	As a rule of thumb, monitoring requests should always monitor a port from	565	As a rule of thumb, monitoring requests should always monitor a port from
518	a local port (or callback). The reason is that kill messages might get	566	a local port (or callback). The reason is that kill messages might get
519	lost, just like any other message. Another less obvious reason is that	567	lost, just like any other message. Another less obvious reason is that
520	even monitoring requests can get lost (for exmaple, when the connection	568	even monitoring requests can get lost (for example, when the connection
521	to the other node goes down permanently). When monitoring a port locally	569	to the other node goes down permanently). When monitoring a port locally
522	these problems do not exist.	570	these problems do not exist.
523		571
		572	C<mon> effectively guarantees that, in the absence of hardware failures,
		573	after starting the monitor, either all messages sent to the port will
		574	arrive, or the monitoring action will be invoked after possible message
		575	loss has been detected. No messages will be lost "in between" (after
		576	the first lost message no further messages will be received by the
		577	port). After the monitoring action was invoked, further messages might get
		578	delivered again.
		579
		580	Inter-host-connection timeouts and monitoring depend on the transport
		581	used. The only transport currently implemented is TCP, and AnyEvent::MP
		582	relies on TCP to detect node-downs (this can take 10-15 minutes on a
		583	non-idle connection, and usually around two hours for idle connections).
		584
		585	This means that monitoring is good for program errors and cleaning up
		586	stuff eventually, but they are no replacement for a timeout when you need
		587	to ensure some maximum latency.
		588
524	Example: call a given callback when C<$port> is killed.	589	Example: call a given callback when C<$port> is killed.
525		590
526	mon $port, sub { warn "port died because of <@_>\n" };	591	mon $port, sub { warn "port died because of <@_>\n" };
527		592
528	Example: kill ourselves when C<$port> is killed abnormally.	593	Example: kill ourselves when C<$port> is killed abnormally.
…		…
534	mon $port, $self => "restart";	599	mon $port, $self => "restart";
535		600
536	=cut	601	=cut
537		602
538	sub mon {	603	sub mon {
539	my ($noderef, $port) = split /#/, shift, 2;	604	my ($nodeid, $port) = split /#/, shift, 2;
540		605
541	my $node = $NODE{$noderef} \|\| add_node $noderef;	606	my $node = $NODE{$nodeid} \|\| add_node $nodeid;
542		607
543	my $cb = @_ ? shift : $SELF \|\| Carp::croak 'mon: called with one argument only, but $SELF not set,';	608	my $cb = @_ ? shift : $SELF \|\| Carp::croak 'mon: called with one argument only, but $SELF not set,';
544		609
545	unless (ref $cb) {	610	unless (ref $cb) {
546	if (@_) {	611	if (@_) {
…		…
555	}	620	}
556		621
557	$node->monitor ($port, $cb);	622	$node->monitor ($port, $cb);
558		623
559	defined wantarray	624	defined wantarray
560	and AnyEvent::Util::guard { $node->unmonitor ($port, $cb) }	625	and ($cb += 0, AnyEvent::Util::guard { $node->unmonitor ($port, $cb) })
561	}	626	}
562		627
563	=item $guard = mon_guard $port, $ref, $ref...	628	=item $guard = mon_guard $port, $ref, $ref...
564		629
565	Monitors the given C<$port> and keeps the passed references. When the port	630	Monitors the given C<$port> and keeps the passed references. When the port
566	is killed, the references will be freed.	631	is killed, the references will be freed.
567		632
568	Optionally returns a guard that will stop the monitoring.	633	Optionally returns a guard that will stop the monitoring.
569		634
570	This function is useful when you create e.g. timers or other watchers and	635	This function is useful when you create e.g. timers or other watchers and
571	want to free them when the port gets killed:	636	want to free them when the port gets killed (note the use of C<psub>):
572		637
573	$port->rcv (start => sub {	638	$port->rcv (start => sub {
574	my $timer; $timer = mon_guard $port, AE::timer 1, 1, sub {	639	my $timer; $timer = mon_guard $port, AE::timer 1, 1, psub {
575	undef $timer if 0.9 < rand;	640	undef $timer if 0.9 < rand;
576	});	641	});
577	});	642	});
578		643
579	=cut	644	=cut
…		…
588		653
589	=item kil $port[, @reason]	654	=item kil $port[, @reason]
590		655
591	Kill the specified port with the given C<@reason>.	656	Kill the specified port with the given C<@reason>.
592		657
593	If no C<@reason> is specified, then the port is killed "normally" (linked	658	If no C<@reason> is specified, then the port is killed "normally" -
594	ports will not be kileld, or even notified).	659	monitor callback will be invoked, but the kil will not cause linked ports
		660	(C<mon $mport, $lport> form) to get killed.
595		661
596	Otherwise, linked ports get killed with the same reason (second form of	662	If a C<@reason> is specified, then linked ports (C<mon $mport, $lport>
597	C<mon>, see below).	663	form) get killed with the same reason.
598		664
599	Runtime errors while evaluating C<rcv> callbacks or inside C<psub> blocks	665	Runtime errors while evaluating C<rcv> callbacks or inside C<psub> blocks
600	will be reported as reason C<< die => $@ >>.	666	will be reported as reason C<< die => $@ >>.
601		667
602	Transport/communication errors are reported as C<< transport_error =>	668	Transport/communication errors are reported as C<< transport_error =>
…		…
607	=item $port = spawn $node, $initfunc[, @initdata]	673	=item $port = spawn $node, $initfunc[, @initdata]
608		674
609	Creates a port on the node C<$node> (which can also be a port ID, in which	675	Creates a port on the node C<$node> (which can also be a port ID, in which
610	case it's the node where that port resides).	676	case it's the node where that port resides).
611		677
612	The port ID of the newly created port is return immediately, and it is	678	The port ID of the newly created port is returned immediately, and it is
613	permissible to immediately start sending messages or monitor the port.	679	possible to immediately start sending messages or to monitor the port.
614		680
615	After the port has been created, the init function is	681	After the port has been created, the init function is called on the remote
616	called. This function must be a fully-qualified function name	682	node, in the same context as a C<rcv> callback. This function must be a
617	(e.g. C<MyApp::Chat::Server::init>). To specify a function in the main	683	fully-qualified function name (e.g. C<MyApp::Chat::Server::init>). To
618	program, use C<::name>.	684	specify a function in the main program, use C<::name>.
619		685
620	If the function doesn't exist, then the node tries to C<require>	686	If the function doesn't exist, then the node tries to C<require>
621	the package, then the package above the package and so on (e.g.	687	the package, then the package above the package and so on (e.g.
622	C<MyApp::Chat::Server>, C<MyApp::Chat>, C<MyApp>) until the function	688	C<MyApp::Chat::Server>, C<MyApp::Chat>, C<MyApp>) until the function
623	exists or it runs out of package names.	689	exists or it runs out of package names.
624		690
625	The init function is then called with the newly-created port as context	691	The init function is then called with the newly-created port as context
626	object (C<$SELF>) and the C<@initdata> values as arguments.	692	object (C<$SELF>) and the C<@initdata> values as arguments. It I<must>
		693	call one of the C<rcv> functions to set callbacks on C<$SELF>, otherwise
		694	the port might not get created.
627		695
628	A common idiom is to pass your own port, monitor the spawned port, and	696	A common idiom is to pass a local port, immediately monitor the spawned
629	in the init function, monitor the original port. This two-way monitoring	697	port, and in the remote init function, immediately monitor the passed
630	ensures that both ports get cleaned up when there is a problem.	698	local port. This two-way monitoring ensures that both ports get cleaned up
		699	when there is a problem.
		700
		701	C<spawn> guarantees that the C<$initfunc> has no visible effects on the
		702	caller before C<spawn> returns (by delaying invocation when spawn is
		703	called for the local node).
631		704
632	Example: spawn a chat server port on C<$othernode>.	705	Example: spawn a chat server port on C<$othernode>.
633		706
634	# this node, executed from within a port context:	707	# this node, executed from within a port context:
635	my $server = spawn $othernode, "MyApp::Chat::Server::connect", $SELF;	708	my $server = spawn $othernode, "MyApp::Chat::Server::connect", $SELF;
…		…
650		723
651	sub _spawn {	724	sub _spawn {
652	my $port = shift;	725	my $port = shift;
653	my $init = shift;	726	my $init = shift;
654		727
		728	# rcv will create the actual port
655	local $SELF = "$NODE#$port";	729	local $SELF = "$NODE#$port";
656	eval {	730	eval {
657	&{ load_func $init }	731	&{ load_func $init }
658	};	732	};
659	_self_die if $@;	733	_self_die if $@;
660	}	734	}
661		735
662	sub spawn(@) {	736	sub spawn(@) {
663	my ($noderef, undef) = split /#/, shift, 2;	737	my ($nodeid, undef) = split /#/, shift, 2;
664		738
665	my $id = "$RUNIQ." . $ID++;	739	my $id = "$RUNIQ." . $ID++;
666		740
667	$_[0] =~ /::/	741	$_[0] =~ /::/
668	or Carp::croak "spawn init function must be a fully-qualified name, caught";	742	or Carp::croak "spawn init function must be a fully-qualified name, caught";
669		743
670	snd_to_func $noderef, "AnyEvent::MP::_spawn" => $id, @_;	744	snd_to_func $nodeid, "AnyEvent::MP::_spawn" => $id, @_;
671		745
672	"$noderef#$id"	746	"$nodeid#$id"
673	}	747	}
674		748
675	=item after $timeout, @msg	749	=item after $timeout, @msg
676		750
677	=item after $timeout, $callback	751	=item after $timeout, $callback
678		752
679	Either sends the given message, or call the given callback, after the	753	Either sends the given message, or call the given callback, after the
680	specified number of seconds.	754	specified number of seconds.
681		755
682	This is simply a utility function that come sin handy at times.	756	This is simply a utility function that comes in handy at times - the
		757	AnyEvent::MP author is not convinced of the wisdom of having it, though,
		758	so it may go away in the future.
683		759
684	=cut	760	=cut
685		761
686	sub after($@) {	762	sub after($@) {
687	my ($timeout, @action) = @_;	763	my ($timeout, @action) = @_;
…		…
692	? $action[0]()	768	? $action[0]()
693	: snd @action;	769	: snd @action;
694	};	770	};
695	}	771	}
696		772
		773	=item cal $port, @msg, $callback[, $timeout]
		774
		775	A simple form of RPC - sends a message to the given C<$port> with the
		776	given contents (C<@msg>), but adds a reply port to the message.
		777
		778	The reply port is created temporarily just for the purpose of receiving
		779	the reply, and will be C<kil>ed when no longer needed.
		780
		781	A reply message sent to the port is passed to the C<$callback> as-is.
		782
		783	If an optional time-out (in seconds) is given and it is not C<undef>,
		784	then the callback will be called without any arguments after the time-out
		785	elapsed and the port is C<kil>ed.
		786
		787	If no time-out is given (or it is C<undef>), then the local port will
		788	monitor the remote port instead, so it eventually gets cleaned-up.
		789
		790	Currently this function returns the temporary port, but this "feature"
		791	might go in future versions unless you can make a convincing case that
		792	this is indeed useful for something.
		793
		794	=cut
		795
		796	sub cal(@) {
		797	my $timeout = ref $_[-1] ? undef : pop;
		798	my $cb = pop;
		799
		800	my $port = port {
		801	undef $timeout;
		802	kil $SELF;
		803	&$cb;
		804	};
		805
		806	if (defined $timeout) {
		807	$timeout = AE::timer $timeout, 0, sub {
		808	undef $timeout;
		809	kil $port;
		810	$cb->();
		811	};
		812	} else {
		813	mon $_[0], sub {
		814	kil $port;
		815	$cb->();
		816	};
		817	}
		818
		819	push @_, $port;
		820	&snd;
		821
		822	$port
		823	}
		824
697	=back	825	=back
698		826
699	=head1 AnyEvent::MP vs. Distributed Erlang	827	=head1 AnyEvent::MP vs. Distributed Erlang
700		828
701	AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node	829	AnyEvent::MP got lots of its ideas from distributed Erlang (Erlang node
702	== aemp node, Erlang process == aemp port), so many of the documents and	830	== aemp node, Erlang process == aemp port), so many of the documents and
703	programming techniques employed by Erlang apply to AnyEvent::MP. Here is a	831	programming techniques employed by Erlang apply to AnyEvent::MP. Here is a
704	sample:	832	sample:
705		833
706	http://www.Erlang.se/doc/programming_rules.shtml	834	http://www.erlang.se/doc/programming_rules.shtml
707	http://Erlang.org/doc/getting_started/part_frame.html # chapters 3 and 4	835	http://erlang.org/doc/getting_started/part_frame.html # chapters 3 and 4
708	http://Erlang.org/download/Erlang-book-part1.pdf # chapters 5 and 6	836	http://erlang.org/download/erlang-book-part1.pdf # chapters 5 and 6
709	http://Erlang.org/download/armstrong_thesis_2003.pdf # chapters 4 and 5	837	http://erlang.org/download/armstrong_thesis_2003.pdf # chapters 4 and 5
710		838
711	Despite the similarities, there are also some important differences:	839	Despite the similarities, there are also some important differences:
712		840
713	=over 4	841	=over 4
714		842
715	=item * Node references contain the recipe on how to contact them.	843	=item * Node IDs are arbitrary strings in AEMP.
716		844
717	Erlang relies on special naming and DNS to work everywhere in the	845	Erlang relies on special naming and DNS to work everywhere in the same
718	same way. AEMP relies on each node knowing it's own address(es), with	846	way. AEMP relies on each node somehow knowing its own address(es) (e.g. by
719	convenience functionality.	847	configuration or DNS), and possibly the addresses of some seed nodes, but
720		848	will otherwise discover other nodes (and their IDs) itself.
721	This means that AEMP requires a less tightly controlled environment at the
722	cost of longer node references and a slightly higher management overhead.
723		849
724	=item * Erlang has a "remote ports are like local ports" philosophy, AEMP	850	=item * Erlang has a "remote ports are like local ports" philosophy, AEMP
725	uses "local ports are like remote ports".	851	uses "local ports are like remote ports".
726		852
727	The failure modes for local ports are quite different (runtime errors	853	The failure modes for local ports are quite different (runtime errors
…		…
740		866
741	Erlang uses processes that selectively receive messages, and therefore	867	Erlang uses processes that selectively receive messages, and therefore
742	needs a queue. AEMP is event based, queuing messages would serve no	868	needs a queue. AEMP is event based, queuing messages would serve no
743	useful purpose. For the same reason the pattern-matching abilities of	869	useful purpose. For the same reason the pattern-matching abilities of
744	AnyEvent::MP are more limited, as there is little need to be able to	870	AnyEvent::MP are more limited, as there is little need to be able to
745	filter messages without dequeing them.	871	filter messages without dequeuing them.
746		872
747	(But see L<Coro::MP> for a more Erlang-like process model on top of AEMP).	873	(But see L<Coro::MP> for a more Erlang-like process model on top of AEMP).
748		874
749	=item * Erlang sends are synchronous, AEMP sends are asynchronous.	875	=item * Erlang sends are synchronous, AEMP sends are asynchronous.
750		876
…		…
752	so does not need a queue that can overflow). AEMP sends are immediate,	878	so does not need a queue that can overflow). AEMP sends are immediate,
753	connection establishment is handled in the background.	879	connection establishment is handled in the background.
754		880
755	=item * Erlang suffers from silent message loss, AEMP does not.	881	=item * Erlang suffers from silent message loss, AEMP does not.
756		882
757	Erlang makes few guarantees on messages delivery - messages can get lost	883	Erlang implements few guarantees on messages delivery - messages can get
758	without any of the processes realising it (i.e. you send messages a, b,	884	lost without any of the processes realising it (i.e. you send messages a,
759	and c, and the other side only receives messages a and c).	885	b, and c, and the other side only receives messages a and c).
760		886
761	AEMP guarantees correct ordering, and the guarantee that there are no	887	AEMP guarantees (modulo hardware errors) correct ordering, and the
		888	guarantee that after one message is lost, all following ones sent to the
		889	same port are lost as well, until monitoring raises an error, so there are
762	holes in the message sequence.	890	no silent "holes" in the message sequence.
763
764	=item * In Erlang, processes can be declared dead and later be found to be
765	alive.
766
767	In Erlang it can happen that a monitored process is declared dead and
768	linked processes get killed, but later it turns out that the process is
769	still alive - and can receive messages.
770
771	In AEMP, when port monitoring detects a port as dead, then that port will
772	eventually be killed - it cannot happen that a node detects a port as dead
773	and then later sends messages to it, finding it is still alive.
774		891
775	=item * Erlang can send messages to the wrong port, AEMP does not.	892	=item * Erlang can send messages to the wrong port, AEMP does not.
776		893
777	In Erlang it is quite likely that a node that restarts reuses a process ID	894	In Erlang it is quite likely that a node that restarts reuses a process ID
778	known to other nodes for a completely different process, causing messages	895	known to other nodes for a completely different process, causing messages
…		…
782	around in the network will not be sent to an unrelated port.	899	around in the network will not be sent to an unrelated port.
783		900
784	=item * Erlang uses unprotected connections, AEMP uses secure	901	=item * Erlang uses unprotected connections, AEMP uses secure
785	authentication and can use TLS.	902	authentication and can use TLS.
786		903
787	AEMP can use a proven protocol - SSL/TLS - to protect connections and	904	AEMP can use a proven protocol - TLS - to protect connections and
788	securely authenticate nodes.	905	securely authenticate nodes.
789		906
790	=item * The AEMP protocol is optimised for both text-based and binary	907	=item * The AEMP protocol is optimised for both text-based and binary
791	communications.	908	communications.
792		909
793	The AEMP protocol, unlike the Erlang protocol, supports both	910	The AEMP protocol, unlike the Erlang protocol, supports both programming
794	language-independent text-only protocols (good for debugging) and binary,	911	language independent text-only protocols (good for debugging) and binary,
795	language-specific serialisers (e.g. Storable).	912	language-specific serialisers (e.g. Storable). By default, unless TLS is
		913	used, the protocol is actually completely text-based.
796		914
797	It has also been carefully designed to be implementable in other languages	915	It has also been carefully designed to be implementable in other languages
798	with a minimum of work while gracefully degrading fucntionality to make the	916	with a minimum of work while gracefully degrading functionality to make the
799	protocol simple.	917	protocol simple.
800		918
801	=item * AEMP has more flexible monitoring options than Erlang.	919	=item * AEMP has more flexible monitoring options than Erlang.
802		920
803	In Erlang, you can chose to receive I<all> exit signals as messages	921	In Erlang, you can chose to receive I<all> exit signals as messages
…		…
806	Erlang, as one can choose between automatic kill, exit message or callback	924	Erlang, as one can choose between automatic kill, exit message or callback
807	on a per-process basis.	925	on a per-process basis.
808		926
809	=item * Erlang tries to hide remote/local connections, AEMP does not.	927	=item * Erlang tries to hide remote/local connections, AEMP does not.
810		928
811	Monitoring in Erlang is not an indicator of process death/crashes,	929	Monitoring in Erlang is not an indicator of process death/crashes, in the
812	as linking is (except linking is unreliable in Erlang).	930	same way as linking is (except linking is unreliable in Erlang).
813		931
814	In AEMP, you don't "look up" registered port names or send to named ports	932	In AEMP, you don't "look up" registered port names or send to named ports
815	that might or might not be persistent. Instead, you normally spawn a port	933	that might or might not be persistent. Instead, you normally spawn a port
816	on the remote node. The init function monitors the you, and you monitor	934	on the remote node. The init function monitors you, and you monitor the
817	the remote port. Since both monitors are local to the node, they are much	935	remote port. Since both monitors are local to the node, they are much more
818	more reliable.	936	reliable (no need for C<spawn_link>).
819		937
820	This also saves round-trips and avoids sending messages to the wrong port	938	This also saves round-trips and avoids sending messages to the wrong port
821	(hard to do in Erlang).	939	(hard to do in Erlang).
822		940
823	=back	941	=back
824		942
825	=head1 RATIONALE	943	=head1 RATIONALE
826		944
827	=over 4	945	=over 4
828		946
829	=item Why strings for ports and noderefs, why not objects?	947	=item Why strings for port and node IDs, why not objects?
830		948
831	We considered "objects", but found that the actual number of methods	949	We considered "objects", but found that the actual number of methods
832	thatc an be called are very low. Since port IDs and noderefs travel over	950	that can be called are quite low. Since port and node IDs travel over
833	the network frequently, the serialising/deserialising would add lots of	951	the network frequently, the serialising/deserialising would add lots of
834	overhead, as well as having to keep a proxy object.	952	overhead, as well as having to keep a proxy object everywhere.
835		953
836	Strings can easily be printed, easily serialised etc. and need no special	954	Strings can easily be printed, easily serialised etc. and need no special
837	procedures to be "valid".	955	procedures to be "valid".
838		956
839	And a a miniport consists of a single closure stored in a global hash - it	957	And as a result, a port with just a default receiver consists of a single
840	can't become much cheaper.	958	code reference stored in a global hash - it can't become much cheaper.
841		959
842	=item Why favour JSON, why not real serialising format such as Storable?	960	=item Why favour JSON, why not a real serialising format such as Storable?
843		961
844	In fact, any AnyEvent::MP node will happily accept Storable as framing	962	In fact, any AnyEvent::MP node will happily accept Storable as framing
845	format, but currently there is no way to make a node use Storable by	963	format, but currently there is no way to make a node use Storable by
846	default.	964	default (although all nodes will accept it).
847		965
848	The default framing protocol is JSON because a) JSON::XS is many times	966	The default framing protocol is JSON because a) JSON::XS is many times
849	faster for small messages and b) most importantly, after years of	967	faster for small messages and b) most importantly, after years of
850	experience we found that object serialisation is causing more problems	968	experience we found that object serialisation is causing more problems
851	than it gains: Just like function calls, objects simply do not travel	969	than it solves: Just like function calls, objects simply do not travel
852	easily over the network, mostly because they will always be a copy, so you	970	easily over the network, mostly because they will always be a copy, so you
853	always have to re-think your design.	971	always have to re-think your design.
854		972
855	Keeping your messages simple, concentrating on data structures rather than	973	Keeping your messages simple, concentrating on data structures rather than
856	objects, will keep your messages clean, tidy and efficient.	974	objects, will keep your messages clean, tidy and efficient.
857		975
858	=back	976	=back
859		977
860	=head1 SEE ALSO	978	=head1 SEE ALSO
861		979
		980	L<AnyEvent::MP::Intro> - a gentle introduction.
		981
		982	L<AnyEvent::MP::Kernel> - more, lower-level, stuff.
		983
		984	L<AnyEvent::MP::Global> - network maintenance and port groups, to find
		985	your applications.
		986
		987	L<AnyEvent::MP::DataConn> - establish data connections between nodes.
		988
		989	L<AnyEvent::MP::LogCatcher> - simple service to display log messages from
		990	all nodes.
		991
862	L<AnyEvent>.	992	L<AnyEvent>.
863		993
864	=head1 AUTHOR	994	=head1 AUTHOR
865		995
866	Marc Lehmann <schmorp@schmorp.de>	996	Marc Lehmann <schmorp@schmorp.de>

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Comparing AnyEvent-MP/MP.pm (file contents): Revision 1.62 by root, Thu Aug 27 07:12:48 2009 UTC vs. Revision 1.117 by root, Wed Oct 27 06:32:39 2010 UTC

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Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.62 by root, Thu Aug 27 07:12:48 2009 UTC vs.
Revision 1.117 by root, Wed Oct 27 06:32:39 2010 UTC