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

Comparing AnyEvent-Fork-RPC/RPC.pm (file contents):
Revision 1.16 by root, Thu Apr 18 14:07:15 2013 UTC vs.
Revision 1.31 by root, Sat Aug 31 16:35:33 2013 UTC

…		…
2		2
3	AnyEvent::Fork::RPC - simple RPC extension for AnyEvent::Fork	3	AnyEvent::Fork::RPC - simple RPC extension for AnyEvent::Fork
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
		7	use AnyEvent::Fork;
7	use AnyEvent::Fork::RPC;	8	use AnyEvent::Fork::RPC;
8	# use AnyEvent::Fork is not needed
9		9
10	my $rpc = AnyEvent::Fork	10	my $rpc = AnyEvent::Fork
11	->new	11	->new
12	->require ("MyModule")	12	->require ("MyModule")
13	->AnyEvent::Fork::RPC::run (	13	->AnyEvent::Fork::RPC::run (
…		…
26	$cv->recv;	26	$cv->recv;
27		27
28	=head1 DESCRIPTION	28	=head1 DESCRIPTION
29		29
30	This module implements a simple RPC protocol and backend for processes	30	This module implements a simple RPC protocol and backend for processes
31	created via L<AnyEvent::Fork>, allowing you to call a function in the	31	created via L<AnyEvent::Fork> or L<AnyEvent::Fork::Remote>, allowing you
32	child process and receive its return values (up to 4GB serialised).	32	to call a function in the child process and receive its return values (up
		33	to 4GB serialised).
33		34
34	It implements two different backends: a synchronous one that works like a	35	It implements two different backends: a synchronous one that works like a
35	normal function call, and an asynchronous one that can run multiple jobs	36	normal function call, and an asynchronous one that can run multiple jobs
36	concurrently in the child, using AnyEvent.	37	concurrently in the child, using AnyEvent.
37		38
38	It also implements an asynchronous event mechanism from the child to the	39	It also implements an asynchronous event mechanism from the child to the
39	parent, that could be used for progress indications or other information.	40	parent, that could be used for progress indications or other information.
40
41	Loading this module also always loads L<AnyEvent::Fork>, so you can make a
42	separate C<use AnyEvent::Fork> if you wish, but you don't have to.
43		41
44	=head1 EXAMPLES	42	=head1 EXAMPLES
45		43
46	=head2 Example 1: Synchronous Backend	44	=head2 Example 1: Synchronous Backend
47		45
…		…
51	silly, but illustrates the use of events.	49	silly, but illustrates the use of events.
52		50
53	First the parent process:	51	First the parent process:
54		52
55	use AnyEvent;	53	use AnyEvent;
		54	use AnyEvent::Fork;
56	use AnyEvent::Fork::RPC;	55	use AnyEvent::Fork::RPC;
57		56
58	my $done = AE::cv;	57	my $done = AE::cv;
59		58
60	my $rpc = AnyEvent::Fork	59	my $rpc = AnyEvent::Fork
61	->new	60	->new
62	->require ("MyWorker")	61	->require ("MyWorker")
63	->AnyEvent::Fork::RPC::run ("MyWorker::run",	62	->AnyEvent::Fork::RPC::run ("MyWorker::run",
64	on_error => sub { warn "FATAL: $_[0]"; exit 1 },	63	on_error => sub { warn "ERROR: $_[0]"; exit 1 },
65	on_event => sub { warn "$_[0] requests handled\n" },	64	on_event => sub { warn "$_[0] requests handled\n" },
66	on_destroy => $done,	65	on_destroy => $done,
67	);	66	);
68		67
69	for my $id (1..6) {	68	for my $id (1..6) {
…		…
191	so silly anymore.	190	so silly anymore.
192		191
193	Without further ado, here is the code:	192	Without further ado, here is the code:
194		193
195	use AnyEvent;	194	use AnyEvent;
		195	use AnyEvent::Fork;
196	use AnyEvent::Fork::RPC;	196	use AnyEvent::Fork::RPC;
197		197
198	my $done = AE::cv;	198	my $done = AE::cv;
199		199
200	my $rpc = AnyEvent::Fork	200	my $rpc = AnyEvent::Fork
201	->new	201	->new
202	->require ("AnyEvent::Fork::RPC::Async")	202	->require ("AnyEvent::Fork::RPC::Async")
203	->eval (do { local $/; <DATA> })	203	->eval (do { local $/; <DATA> })
204	->AnyEvent::Fork::RPC::run ("run",	204	->AnyEvent::Fork::RPC::run ("run",
205	async => 1,	205	async => 1,
206	on_error => sub { warn "FATAL: $_[0]"; exit 1 },	206	on_error => sub { warn "ERROR: $_[0]"; exit 1 },
207	on_event => sub { print $_[0] },	207	on_event => sub { print $_[0] },
208	on_destroy => $done,	208	on_destroy => $done,
209	);	209	);
210		210
211	for my $count (3, 2, 1) {	211	for my $count (3, 2, 1) {
…		…
287		287
288	This concludes the async example. Since L<AnyEvent::Fork> does not	288	This concludes the async example. Since L<AnyEvent::Fork> does not
289	actually fork, you are free to use about any module in the child, not just	289	actually fork, you are free to use about any module in the child, not just
290	L<AnyEvent>, but also L<IO::AIO>, or L<Tk> for example.	290	L<AnyEvent>, but also L<IO::AIO>, or L<Tk> for example.
291		291
		292	=head2 Example 3: Asynchronous backend with Coro
		293
		294	With L<Coro> you can create a nice asynchronous backend implementation by
		295	defining an rpc server function that creates a new Coro thread for every
		296	request that calls a function "normally", i.e. the parameters from the
		297	parent process are passed to it, and any return values are returned to the
		298	parent process, e.g.:
		299
		300	package My::Arith;
		301
		302	sub add {
		303	return $_[0] + $_[1];
		304	}
		305
		306	sub mul {
		307	return $_[0] * $_[1];
		308	}
		309
		310	sub run {
		311	my ($done, $func, @arg) = @_;
		312
		313	Coro::async_pool {
		314	$done->($func->(@arg));
		315	};
		316	}
		317
		318	The C<run> function creates a new thread for every invocation, using the
		319	first argument as function name, and calls the C<$done> callback on it's
		320	return values. This makes it quite natural to define the C<add> and C<mul>
		321	functions to add or multiply two numbers and return the result.
		322
		323	Since this is the asynchronous backend, it's quite possible to define RPC
		324	function that do I/O or wait for external events - their execution will
		325	overlap as needed.
		326
		327	The above could be used like this:
		328
		329	my $rpc = AnyEvent::Fork
		330	->new
		331	->require ("MyWorker")
		332	->AnyEvent::Fork::RPC::run ("My::Arith::run",
		333	on_error => ..., on_event => ..., on_destroy => ...,
		334	);
		335
		336	$rpc->(add => 1, 3, Coro::rouse_cb); say Coro::rouse_wait;
		337	$rpc->(mul => 3, 2, Coro::rouse_cb); say Coro::rouse_wait;
		338
		339	The C<say>'s will print C<4> and C<6>.
		340
		341	=head2 Example 4: Forward AnyEvent::Log messages using C<on_event>
		342
		343	This partial example shows how to use the C<event> function to forward
		344	L<AnyEvent::Log> messages to the parent.
		345
		346	For this, the parent needs to provide a suitable C<on_event>:
		347
		348	->AnyEvent::Fork::RPC::run (
		349	on_event => sub {
		350	if ($_[0] eq "ae_log") {
		351	my (undef, $level, $message) = @_;
		352	AE::log $level, $message;
		353	} else {
		354	# other event types
		355	}
		356	},
		357	)
		358
		359	In the child, as early as possible, the following code should reconfigure
		360	L<AnyEvent::Log> to log via C<AnyEvent::Fork::RPC::event>:
		361
		362	$AnyEvent::Log::LOG->log_cb (sub {
		363	my ($timestamp, $orig_ctx, $level, $message) = @{+shift};
		364
		365	if (defined &AnyEvent::Fork::RPC::event) {
		366	AnyEvent::Fork::RPC::event (ae_log => $level, $message);
		367	} else {
		368	warn "[$$ before init] $message\n";
		369	}
		370	});
		371
		372	There is an important twist - the C<AnyEvent::Fork::RPC::event> function
		373	is only defined when the child is fully initialised. If you redirect the
		374	log messages in your C<init> function for example, then the C<event>
		375	function might not yet be available. This is why the log callback checks
		376	whether the fucntion is there using C<defined>, and only then uses it to
		377	log the message.
		378
292	=head1 PARENT PROCESS USAGE	379	=head1 PARENT PROCESS USAGE
293		380
294	This module exports nothing, and only implements a single function:	381	This module exports nothing, and only implements a single function:
295		382
296	=over 4	383	=over 4
…		…
303		390
304	use Errno ();	391	use Errno ();
305	use Guard ();	392	use Guard ();
306		393
307	use AnyEvent;	394	use AnyEvent;
308	use AnyEvent::Fork; # we don't actually depend on it, this is for convenience
309		395
310	our $VERSION = 0.1;	396	our $VERSION = 1.1;
311		397
312	=item my $rpc = AnyEvent::Fork::RPC::run $fork, $function, [key => value...]	398	=item my $rpc = AnyEvent::Fork::RPC::run $fork, $function, [key => value...]
313		399
314	The traditional way to call it. But it is way cooler to call it in the	400	The traditional way to call it. But it is way cooler to call it in the
315	following way:	401	following way:
…		…
335	Called on (fatal) errors, with a descriptive (hopefully) message. If	421	Called on (fatal) errors, with a descriptive (hopefully) message. If
336	this callback is not provided, but C<on_event> is, then the C<on_event>	422	this callback is not provided, but C<on_event> is, then the C<on_event>
337	callback is called with the first argument being the string C<error>,	423	callback is called with the first argument being the string C<error>,
338	followed by the error message.	424	followed by the error message.
339		425
340	If neither handler is provided it prints the error to STDERR and will	426	If neither handler is provided, then the error is reported with loglevel
341	start failing badly.	427	C<error> via C<AE::log>.
342		428
343	=item on_event => $cb->(...)	429	=item on_event => $cb->(...)
344		430
345	Called for every call to the C<AnyEvent::Fork::RPC::event> function in the	431	Called for every call to the C<AnyEvent::Fork::RPC::event> function in the
346	child, with the arguments of that function passed to the callback.	432	child, with the arguments of that function passed to the callback.
…		…
368	It is called very early - before the serialisers are created or the	454	It is called very early - before the serialisers are created or the
369	C<$function> name is resolved into a function reference, so it could be	455	C<$function> name is resolved into a function reference, so it could be
370	used to load any modules that provide the serialiser or function. It can	456	used to load any modules that provide the serialiser or function. It can
371	not, however, create events.	457	not, however, create events.
372		458
		459	=item done => $function (default C<CORE::exit>)
		460
		461	The function to call when the asynchronous backend detects an end of file
		462	condition when reading from the communications socket I<and> there are no
		463	outstanding requests. It's ignored by the synchronous backend.
		464
		465	By overriding this you can prolong the life of a RPC process after e.g.
		466	the parent has exited by running the event loop in the provided function
		467	(or simply calling it, for example, when your child process uses L<EV> you
		468	could provide L<EV::loop> as C<done> function).
		469
		470	Of course, in that case you are responsible for exiting at the appropriate
		471	time and not returning from
		472
373	=item async => $boolean (default: 0)	473	=item async => $boolean (default: 0)
374		474
375	The default server used in the child does all I/O blockingly, and only	475	The default server used in the child does all I/O blockingly, and only
376	allows a single RPC call to execute concurrently.	476	allows a single RPC call to execute concurrently.
377		477
…		…
415	=over 4	515	=over 4
416		516
417	=item octet strings - C<$AnyEvent::Fork::RPC::STRING_SERIALISER>	517	=item octet strings - C<$AnyEvent::Fork::RPC::STRING_SERIALISER>
418		518
419	This serialiser concatenates length-prefixes octet strings, and is the	519	This serialiser concatenates length-prefixes octet strings, and is the
420	default.	520	default. That means you can only pass (and return) strings containing
		521	character codes 0-255.
421		522
422	Implementation:	523	Implementation:
423		524
424	(	525	(
425	sub { pack "(w/a)", @_ },	526	sub { pack "(w/a)", @_ },
…		…
446		547
447	=item storable - C<$AnyEvent::Fork::RPC::STORABLE_SERIALISER>	548	=item storable - C<$AnyEvent::Fork::RPC::STORABLE_SERIALISER>
448		549
449	This serialiser uses L<Storable>, which means it has high chance of	550	This serialiser uses L<Storable>, which means it has high chance of
450	serialising just about anything you throw at it, at the cost of having	551	serialising just about anything you throw at it, at the cost of having
451	very high overhead per operation. It also comes with perl.	552	very high overhead per operation. It also comes with perl. It should be
		553	used when you need to serialise complex data structures.
452		554
453	Implementation:	555	Implementation:
454		556
455	use Storable ();	557	use Storable ();
456	(	558	(
457	sub { Storable::freeze \@_ },	559	sub { Storable::freeze \@_ },
458	sub { @{ Storable::thaw shift } }	560	sub { @{ Storable::thaw shift } }
459	)	561	)
460		562
		563	=item portable storable - C<$AnyEvent::Fork::RPC::NSTORABLE_SERIALISER>
		564
		565	This serialiser also uses L<Storable>, but uses it's "network" format
		566	to serialise data, which makes it possible to talk to different
		567	perl binaries (for example, when talking to a process created with
		568	L<AnyEvent::Fork::Remote>).
		569
		570	Implementation:
		571
		572	use Storable ();
		573	(
		574	sub { Storable::nfreeze \@_ },
		575	sub { @{ Storable::thaw shift } }
		576	)
		577
461	=back	578	=back
462		579
463	=back	580	=back
464		581
465	See the examples section earlier in this document for some actual	582	See the examples section earlier in this document for some actual
466	examples.	583	examples.
467		584
468	=cut	585	=cut
469		586
470	our $STRING_SERIALISER = '(sub { pack "(w/a)", @_ }, sub { unpack "(w/a)", shift })';	587	our $STRING_SERIALISER = '(sub { pack "(w/a)", @_ }, sub { unpack "(w/a)", shift })';
471	our $JSON_SERIALISER = 'use JSON (); (sub { JSON::encode_json \@_ }, sub { @{ JSON::decode_json shift } })';	588	our $JSON_SERIALISER = 'use JSON (); (sub { JSON::encode_json \@_ }, sub { @{ JSON::decode_json shift } })';
472	our $STORABLE_SERIALISER = 'use Storable (); (sub { Storable::freeze \@_ }, sub { @{ Storable::thaw shift } })';	589	our $STORABLE_SERIALISER = 'use Storable (); (sub { Storable::freeze \@_ }, sub { @{ Storable::thaw shift } })';
		590	our $NSTORABLE_SERIALISER = 'use Storable (); (sub { Storable::nfreeze \@_ }, sub { @{ Storable::thaw shift } })';
473		591
474	sub run {	592	sub run {
475	my ($self, $function, %arg) = @_;	593	my ($self, $function, %arg) = @_;
476		594
477	my $serialiser = delete $arg{serialiser} \|\| $STRING_SERIALISER;	595	my $serialiser = delete $arg{serialiser} \|\| $STRING_SERIALISER;
…		…
480	my $on_destroy = delete $arg{on_destroy};	598	my $on_destroy = delete $arg{on_destroy};
481		599
482	# default for on_error is to on_event, if specified	600	# default for on_error is to on_event, if specified
483	$on_error \|\|= $on_event	601	$on_error \|\|= $on_event
484	? sub { $on_event->(error => shift) }	602	? sub { $on_event->(error => shift) }
485	: sub { die "AnyEvent::Fork::RPC: uncaught error: $_[0].\n" };	603	: sub { AE::log die => "AnyEvent::Fork::RPC: uncaught error: $_[0]." };
486		604
487	# default for on_event is to raise an error	605	# default for on_event is to raise an error
488	$on_event \|\|= sub { $on_error->("event received, but no on_event handler") };	606	$on_event \|\|= sub { $on_error->("event received, but no on_event handler") };
489		607
490	my ($f, $t) = eval $serialiser; die $@ if $@;	608	my ($f, $t) = eval $serialiser; die $@ if $@;
…		…
511	};	629	};
512		630
513	my $module = "AnyEvent::Fork::RPC::" . ($arg{async} ? "Async" : "Sync");	631	my $module = "AnyEvent::Fork::RPC::" . ($arg{async} ? "Async" : "Sync");
514		632
515	$self->require ($module)	633	$self->require ($module)
516	->send_arg ($function, $arg{init}, $serialiser)	634	->send_arg ($function, $arg{init}, $serialiser, $arg{done} \|\| "CORE::exit")
517	->run ("$module\::run", sub {	635	->run ("$module\::run", sub {
518	$fh = shift;	636	$fh = shift;
519		637
520	my ($id, $len);	638	my ($id, $len);
521	$rw = AE::io $fh, 0, sub {	639	$rw = AE::io $fh, 0, sub {
522	$rlen = $rlen * 2 + 16 if $rlen - 128 < length $rbuf;	640	$rlen = $rlen * 2 + 16 if $rlen - 128 < length $rbuf;
523	$len = sysread $fh, $rbuf, $rlen - length $rbuf, length $rbuf;	641	$len = sysread $fh, $rbuf, $rlen - length $rbuf, length $rbuf;
524		642
525	if ($len) {	643	if ($len) {
526	while (8 <= length $rbuf) {	644	while (8 <= length $rbuf) {
527	($id, $len) = unpack "LL", $rbuf;	645	($id, $len) = unpack "NN", $rbuf;
528	8 + $len <= length $rbuf	646	8 + $len <= length $rbuf
529	or last;	647	or last;
530		648
531	my @r = $t->(substr $rbuf, 8, $len);	649	my @r = $t->(substr $rbuf, 8, $len);
532	substr $rbuf, 0, 8 + $len, "";	650	substr $rbuf, 0, 8 + $len, "";
…		…
548	undef $rw; undef $ww; # it ends here	666	undef $rw; undef $ww; # it ends here
549		667
550	if (@rcb \|\| %rcb) {	668	if (@rcb \|\| %rcb) {
551	$on_error->("unexpected eof");	669	$on_error->("unexpected eof");
552	} else {	670	} else {
553	$on_destroy->();	671	$on_destroy->()
		672	if $on_destroy;
554	}	673	}
555	} elsif ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {	674	} elsif ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {
556	undef $rw; undef $ww; # it ends here	675	undef $rw; undef $ww; # it ends here
557	$on_error->("read: $!");	676	$on_error->("read: $!");
558	}	677	}
…		…
561	$ww \|\|= AE::io $fh, 1, $wcb;	680	$ww \|\|= AE::io $fh, 1, $wcb;
562	});	681	});
563		682
564	my $guard = Guard::guard {	683	my $guard = Guard::guard {
565	$shutdown = 1;	684	$shutdown = 1;
566	$ww \|\|= $fh && AE::io $fh, 1, $wcb;	685
		686	shutdown $fh, 1 if $fh && !$ww;
567	};	687	};
568		688
569	my $id;	689	my $id;
570		690
571	$arg{async}	691	$arg{async}
…		…
573	$id = ($id == 0xffffffff ? 0 : $id) + 1;	693	$id = ($id == 0xffffffff ? 0 : $id) + 1;
574	$id = ($id == 0xffffffff ? 0 : $id) + 1 while exists $rcb{$id}; # rarely loops	694	$id = ($id == 0xffffffff ? 0 : $id) + 1 while exists $rcb{$id}; # rarely loops
575		695
576	$rcb{$id} = pop;	696	$rcb{$id} = pop;
577		697
578	$guard; # keep it alive	698	$guard if 0; # keep it alive
579		699
580	$wbuf .= pack "LL/a*", $id, &$f;	700	$wbuf .= pack "NN/a*", $id, &$f;
581	$ww \|\|= $fh && AE::io $fh, 1, $wcb;	701	$ww \|\|= $fh && AE::io $fh, 1, $wcb;
582	}	702	}
583	: sub {	703	: sub {
584	push @rcb, pop;	704	push @rcb, pop;
585		705
586	$guard; # keep it alive	706	$guard; # keep it alive
587		707
588	$wbuf .= pack "L/a*", &$f;	708	$wbuf .= pack "N/a*", &$f;
589	$ww \|\|= $fh && AE::io $fh, 1, $wcb;	709	$ww \|\|= $fh && AE::io $fh, 1, $wcb;
590	}	710	}
591	}	711	}
592		712
593	=item $rpc->(..., $cb->(...))	713	=item $rpc->(..., $cb->(...))
…		…
632	child process to the parent, except that there is no notion of return	752	child process to the parent, except that there is no notion of return
633	values.	753	values.
634		754
635	See the examples section earlier in this document for some actual	755	See the examples section earlier in this document for some actual
636	examples.	756	examples.
		757
		758	=back
		759
		760	=head2 PROCESS EXIT
		761
		762	If and when the child process exits depends on the backend and
		763	configuration. Apart from explicit exits (e.g. by calling C<exit>) or
		764	runtime conditions (uncaught exceptions, signals etc.), the backends exit
		765	under these conditions:
		766
		767	=over 4
		768
		769	=item Synchronous Backend
		770
		771	The synchronous backend is very simple: when the process waits for another
		772	request to arrive and the writing side (usually in the parent) is closed,
		773	it will exit normally, i.e. as if your main program reached the end of the
		774	file.
		775
		776	That means that if your parent process exits, the RPC process will usually
		777	exit as well, either because it is idle anyway, or because it executes a
		778	request. In the latter case, you will likely get an error when the RPc
		779	process tries to send the results to the parent (because agruably, you
		780	shouldn't exit your parent while there are still outstanding requests).
		781
		782	The process is usually quiescent when it happens, so it should rarely be a
		783	problem, and C<END> handlers can be used to clean up.
		784
		785	=item Asynchronous Backend
		786
		787	For the asynchronous backend, things are more complicated: Whenever it
		788	listens for another request by the parent, it might detect that the socket
		789	was closed (e.g. because the parent exited). It will sotp listening for
		790	new requests and instead try to write out any remaining data (if any) or
		791	simply check whether the socket cna be written to. After this, the RPC
		792	process is effectively done - no new requests are incoming, no outstanding
		793	request data can be written back.
		794
		795	Since chances are high that there are event watchers that the RPC server
		796	knows nothing about (why else would one use the async backend if not for
		797	the ability to register watchers?), the event loop would often happily
		798	continue.
		799
		800	This is why the asynchronous backend explicitly calls C<CORE::exit> when
		801	it is done (it will raise an exception under other circumstances, which
		802	might lead to the process not exiting on it's own).
		803
		804	You can override this by specifying a function name to call via the C<done>
		805	parameter instead.
637		806
638	=back	807	=back
639		808
640	=head1 ADVANCED TOPICS	809	=head1 ADVANCED TOPICS
641		810
…		…
724	half it has passed earlier.	893	half it has passed earlier.
725		894
726	Here is some (untested) pseudocode to that effect:	895	Here is some (untested) pseudocode to that effect:
727		896
728	use AnyEvent::Util;	897	use AnyEvent::Util;
		898	use AnyEvent::Fork;
729	use AnyEvent::Fork::RPC;	899	use AnyEvent::Fork::RPC;
730	use IO::FDPass;	900	use IO::FDPass;
731		901
732	my ($s1, $s2) = AnyEvent::Util::portable_socketpair;	902	my ($s1, $s2) = AnyEvent::Util::portable_socketpair;
733		903
…		…
769		939
770	Of course, this might be blocking if you pass a lot of file descriptors,	940	Of course, this might be blocking if you pass a lot of file descriptors,
771	so you might want to look into L<AnyEvent::FDpasser> which can handle the	941	so you might want to look into L<AnyEvent::FDpasser> which can handle the
772	gory details.	942	gory details.
773		943
		944	=head1 EXCEPTIONS
		945
		946	There are no provisions whatsoever for catching exceptions at this time -
		947	in the child, exeptions might kill the process, causing calls to be lost
		948	and the parent encountering a fatal error. In the parent, exceptions in
		949	the result callback will not be caught and cause undefined behaviour.
		950
774	=head1 SEE ALSO	951	=head1 SEE ALSO
775		952
776	L<AnyEvent::Fork>, to create the processes in the first place.	953	L<AnyEvent::Fork>, to create the processes in the first place.
		954
		955	L<AnyEvent::Fork::Remote>, likewise, but helpful for remote processes.
777		956
778	L<AnyEvent::Fork::Pool>, to manage whole pools of processes.	957	L<AnyEvent::Fork::Pool>, to manage whole pools of processes.
779		958
780	=head1 AUTHOR AND CONTACT INFORMATION	959	=head1 AUTHOR AND CONTACT INFORMATION
781		960

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Comparing AnyEvent-Fork-RPC/RPC.pm (file contents): Revision 1.16 by root, Thu Apr 18 14:07:15 2013 UTC vs. Revision 1.31 by root, Sat Aug 31 16:35:33 2013 UTC

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Comparing AnyEvent-Fork-RPC/RPC.pm (file contents):
Revision 1.16 by root, Thu Apr 18 14:07:15 2013 UTC vs.
Revision 1.31 by root, Sat Aug 31 16:35:33 2013 UTC