[ViewVC] Diff of: cvs/EV/EV.pm

Comparing EV/EV.pm (file contents):
Revision 1.12 by root, Mon Oct 29 08:52:28 2007 UTC vs.
Revision 1.102 by root, Mon Sep 8 17:27:42 2008 UTC

1	=head1 NAME	1	=head1 NAME
2		2
3	EV - perl interface to libevent, monkey.org/~provos/libevent/	3	EV - perl interface to libev, a high performance full-featured event loop
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use EV;	7	use EV;
		8
		9	# TIMERS
		10
		11	my $w = EV::timer 2, 0, sub {
		12	warn "is called after 2s";
		13	};
		14
		15	my $w = EV::timer 2, 2, sub {
		16	warn "is called roughly every 2s (repeat = 2)";
		17	};
		18
		19	undef $w; # destroy event watcher again
		20
		21	my $w = EV::periodic 0, 60, 0, sub {
		22	warn "is called every minute, on the minute, exactly";
		23	};
		24
		25	# IO
		26
		27	my $w = EV::io *STDIN, EV::READ, sub {
		28	my ($w, $revents) = @_; # all callbacks receive the watcher and event mask
		29	warn "stdin is readable, you entered: ", <STDIN>;
		30	};
		31
		32	# SIGNALS
		33
		34	my $w = EV::signal 'QUIT', sub {
		35	warn "sigquit received\n";
		36	};
		37
		38	# CHILD/PID STATUS CHANGES
8		39
9	# TIMER	40	my $w = EV::child 666, 0, sub {
		41	my ($w, $revents) = @_;
		42	my $status = $w->rstatus;
		43	};
10		44
11	my $w = EV::timer 2, 0, sub {	45	# STAT CHANGES
12	warn "is called after 2s";	46	my $w = EV::stat "/etc/passwd", 10, sub {
13	};
14
15	my $w = EV::timer 2, 1, sub {
16	warn "is called roughly every 2s (repeat = 1)";
17	};
18
19	undef $w; # destroy event watcher again
20
21	my $w = EV::timer_abs 0, 60, sub {
22	warn "is called every minute, on the minute, exactly";
23	};
24
25	# IO
26
27	my $w = EV::io \*STDIN, EV::READ \| EV::PERSIST, sub {
28	my ($w, $events) = @_; # all callbacks get the watcher object and event mask
29	if ($events & EV::TIMEOUT) {
30	warn "nothing received on stdin for 10 seconds, retrying";
31	} else {
32	warn "stdin is readable, you entered: ", <STDIN>;
33	}
34	};
35	$w->timeout (10);
36
37	my $w = EV::timed_io \*STDIN, EV::READ, 30, sub {
38	my ($w, $events) = @_;	47	my ($w, $revents) = @_;
39	if ($_[1] & EV::TIMEOUT) {	48	warn $w->path, " has changed somehow.\n";
40	warn "nothing entered within 30 seconds, bye bye.\n";
41	$w->stop;
42	} else {
43	my $line = <STDIN>;
44	warn "you entered something, you again have 30 seconds.\n";
45	}
46	};	49	};
47		50
48	# SIGNALS
49
50	my $w = EV::signal 'QUIT', sub {
51	warn "sigquit received\n";
52	};
53
54	my $w = EV::signal 3, sub {
55	warn "sigquit received (this is GNU/Linux, right?)\n";
56	};
57
58	# MAINLOOP	51	# MAINLOOP
59	EV::dispatch; # loop as long as watchers are active	52	EV::loop; # loop until EV::unloop is called or all watchers stop
60	EV::loop; # the same thing
61	EV::loop EV::LOOP_ONCE; # block until some events could be handles	53	EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled
62	EV::loop EV::LOOP_NONBLOCK; # check and handle some events, but do not wait	54	EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
63		55
64	=head1 DESCRIPTION	56	=head1 DESCRIPTION
65		57
66	This module provides an interface to libevent	58	This module provides an interface to libev
67	(L<http://monkey.org/~provos/libevent/>). You probably should acquaint	59	(L<http://software.schmorp.de/pkg/libev.html>). While the documentation
68	yourself with its documentation and source code to be able to use this	60	below is comprehensive, one might also consult the documentation of libev
69	module fully.	61	itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>) for more
		62	subtle details on watcher semantics or some discussion on the available
		63	backends, or how to force a specific backend with C<LIBEV_FLAGS>, or just
		64	about in any case because it has much more detailed information.
70		65
71	Please note thta this module disables the libevent EPOLL method by	66	This module is very fast and scalable. It is actually so fast that you
72	default, see BUGS, below, if you need to enable it.	67	can use it through the L<AnyEvent> module, stay portable to other event
		68	loops (if you don't rely on any watcher types not available through it)
		69	and still be faster than with any other event loop currently supported in
		70	Perl.
73		71
74	=cut	72	=cut
75		73
76	package EV;	74	package EV;
77		75
		76	no warnings;
78	use strict;	77	use strict;
79		78
80	BEGIN {	79	BEGIN {
81	our $VERSION = '0.03';	80	our $VERSION = '3.44';
82	use XSLoader;	81	use XSLoader;
83	XSLoader::load "EV", $VERSION;	82	XSLoader::load "EV", $VERSION;
84	}	83	}
85		84
		85	@EV::IO::ISA =
		86	@EV::Timer::ISA =
		87	@EV::Periodic::ISA =
		88	@EV::Signal::ISA =
		89	@EV::Child::ISA =
		90	@EV::Stat::ISA =
		91	@EV::Idle::ISA =
		92	@EV::Prepare::ISA =
		93	@EV::Check::ISA =
		94	@EV::Embed::ISA =
		95	@EV::Fork::ISA =
		96	@EV::Async::ISA =
		97	"EV::Watcher";
		98
		99	@EV::Loop::Default::ISA = "EV::Loop";
		100
		101	=head1 EVENT LOOPS
		102
		103	EV supports multiple event loops: There is a single "default event loop"
		104	that can handle everything including signals and child watchers, and any
		105	number of "dynamic event loops" that can use different backends (with
		106	various limitations), but no child and signal watchers.
		107
		108	You do not have to do anything to create the default event loop: When
		109	the module is loaded a suitable backend is selected on the premise of
		110	selecting a working backend (which for example rules out kqueue on most
		111	BSDs). Modules should, unless they have "special needs" always use the
		112	default loop as this is fastest (perl-wise), best supported by other
		113	modules (e.g. AnyEvent or Coro) and most portable event loop.
		114
		115	For specific programs you can create additional event loops dynamically.
		116
		117	If you want to take avdantage of kqueue (which often works properly for
		118	sockets only) even though the default loop doesn't enable it, you can
		119	I<embed> a kqueue loop into the default loop: running the default loop
		120	will then also service the kqueue loop to some extent. See the example in
		121	the section about embed watchers for an example on how to achieve that.
		122
		123	=over 4
		124
		125	=item $loop = new EV::loop [$flags]
		126
		127	Create a new event loop as per the specified flags. Please refer to the
		128	C<ev_loop_new ()> function description in the libev documentation
		129	(L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>)
		130	for more info.
		131
		132	The loop will automatically be destroyed when it is no longer referenced
		133	by any watcher and the loop object goes out of scope.
		134
		135	Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop
		136	is protected by this module.
		137
		138	=item $loop->loop_fork
		139
		140	Must be called after a fork in the child, before entering or continuing
		141	the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls
		142	this function automatically, at some performance loss (refer to the libev
		143	documentation).
		144
		145	=item $loop->loop_verify
		146
		147	Calls C<ev_verify> to make internal consistency checks (for debugging
		148	libev) and abort the program if any data structures were found to be
		149	corrupted.
		150
		151	=item $loop = EV::default_loop [$flags]
		152
		153	Return the default loop (which is a singleton object). Since this module
		154	already creates the default loop with default flags, specifying flags here
		155	will not have any effect unless you destroy the default loop first, which
		156	isn't supported. So in short: don't do it, and if you break it, you get to
		157	keep the pieces.
		158
		159	=back
		160
		161
86	=head1 BASIC INTERFACE	162	=head1 BASIC INTERFACE
87		163
88	=over 4	164	=over 4
89		165
90	=item $EV::NPRI
91
92	How many priority levels are available.
93
94	=item $EV::DIED	166	=item $EV::DIED
95		167
96	Must contain a reference to a function that is called when a callback	168	Must contain a reference to a function that is called when a callback
97	throws an exception (with $@ containing thr error). The default prints an	169	throws an exception (with $@ containing the error). The default prints an
98	informative message and continues.	170	informative message and continues.
99		171
100	If this callback throws an exception it will be silently ignored.	172	If this callback throws an exception it will be silently ignored.
101		173
		174	=item $flags = EV::supported_backends
		175
		176	=item $flags = EV::recommended_backends
		177
		178	=item $flags = EV::embeddable_backends
		179
		180	Returns the set (see C<EV::BACKEND_*> flags) of backends supported by this
		181	instance of EV, the set of recommended backends (supposed to be good) for
		182	this platform and the set of embeddable backends (see EMBED WATCHERS).
		183
		184	=item EV::sleep $seconds
		185
		186	Block the process for the given number of (fractional) seconds.
		187
		188	=item $time = EV::time
		189
		190	Returns the current time in (fractional) seconds since the epoch.
		191
102	=item $time = EV::now	192	=item $time = EV::now
103		193
104	Returns the time in (fractional) seconds since the epoch.	194	=item $time = $loop->now
105		195
106	=item $version = EV::version	196	Returns the time the last event loop iteration has been started. This
		197	is the time that (relative) timers are based on, and refering to it is
		198	usually faster then calling EV::time.
107		199
108	=item $method = EV::method	200	=item $backend = EV::backend
109		201
110	Return version string and event polling method used.	202	=item $backend = $loop->backend
111		203
112	=item EV::loop $flags # EV::LOOP_ONCE, EV::LOOP_ONESHOT	204	Returns an integer describing the backend used by libev (EV::METHOD_SELECT
		205	or EV::METHOD_EPOLL).
113		206
114	=item EV::loopexit $after	207	=item EV::loop [$flags]
115		208
116	Exit any active loop or dispatch after C<$after> seconds or immediately if	209	=item $loop->loop ([$flags])
117	C<$after> is missing or zero.
118		210
119	=item EV::dispatch	211	Begin checking for events and calling callbacks. It returns when a
		212	callback calls EV::unloop.
120		213
121	Same as C<EV::loop 0>.	214	The $flags argument can be one of the following:
122		215
123	=item EV::event $callback	216	0 as above
		217	EV::LOOP_ONESHOT block at most once (wait, but do not loop)
		218	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
124		219
125	Creates a new event watcher waiting for nothing, calling the given callback.	220	=item EV::unloop [$how]
126		221
		222	=item $loop->unloop ([$how])
		223
		224	When called with no arguments or an argument of EV::UNLOOP_ONE, makes the
		225	innermost call to EV::loop return.
		226
		227	When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as
		228	fast as possible.
		229
		230	=item $count = EV::loop_count
		231
		232	=item $count = $loop->loop_count
		233
		234	Return the number of times the event loop has polled for new
		235	events. Sometiems useful as a generation counter.
		236
		237	=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
		238
		239	=item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents))
		240
		241	This function rolls together an I/O and a timer watcher for a single
		242	one-shot event without the need for managing a watcher object.
		243
		244	If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events>
		245	must be a bitset containing either C<EV::READ>, C<EV::WRITE> or C<EV::READ
		246	\| EV::WRITE>, indicating the type of I/O event you want to wait for. If
		247	you do not want to wait for some I/O event, specify C<undef> for
		248	C<$fh_or_undef> and C<0> for C<$events>).
		249
		250	If timeout is C<undef> or negative, then there will be no
		251	timeout. Otherwise a EV::timer with this value will be started.
		252
		253	When an error occurs or either the timeout or I/O watcher triggers, then
		254	the callback will be called with the received event set (in general
		255	you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
		256	C<EV::WRITE> and C<EV::TIMEOUT>).
		257
		258	EV::once doesn't return anything: the watchers stay active till either
		259	of them triggers, then they will be stopped and freed, and the callback
		260	invoked.
		261
		262	=item EV::feed_fd_event ($fd, $revents)
		263
		264	=item $loop->feed_fd_event ($fd, $revents)
		265
		266	Feed an event on a file descriptor into EV. EV will react to this call as
		267	if the readyness notifications specified by C<$revents> (a combination of
		268	C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>.
		269
		270	=item EV::feed_signal_event ($signal)
		271
		272	Feed a signal event into EV. EV will react to this call as if the signal
		273	specified by C<$signal> had occured.
		274
		275	=item EV::set_io_collect_interval $time
		276
		277	=item $loop->set_io_collect_interval ($time)
		278
		279	=item EV::set_timeout_collect_interval $time
		280
		281	=item $loop->set_timeout_collect_interval ($time)
		282
		283	These advanced functions set the minimum block interval when polling for I/O events and the minimum
		284	wait interval for timer events. See the libev documentation at
		285	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for
		286	a more detailed discussion.
		287
		288	=back
		289
		290
		291	=head1 WATCHER OBJECTS
		292
		293	A watcher is an object that gets created to record your interest in some
		294	event. For instance, if you want to wait for STDIN to become readable, you
		295	would create an EV::io watcher for that:
		296
		297	my $watcher = EV::io *STDIN, EV::READ, sub {
		298	my ($watcher, $revents) = @_;
		299	warn "yeah, STDIN should now be readable without blocking!\n"
		300	};
		301
		302	All watchers can be active (waiting for events) or inactive (paused). Only
		303	active watchers will have their callbacks invoked. All callbacks will be
		304	called with at least two arguments: the watcher and a bitmask of received
		305	events.
		306
		307	Each watcher type has its associated bit in revents, so you can use the
		308	same callback for multiple watchers. The event mask is named after the
		309	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
		310	EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events
		311	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
		312	uses EV::TIMEOUT).
		313
		314	In the rare case where one wants to create a watcher but not start it at
		315	the same time, each constructor has a variant with a trailing C<_ns> in
		316	its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
		317
		318	Please note that a watcher will automatically be stopped when the watcher
		319	object is destroyed, so you I<need> to keep the watcher objects returned by
		320	the constructors.
		321
		322	Also, all methods changing some aspect of a watcher (->set, ->priority,
		323	->fh and so on) automatically stop and start it again if it is active,
		324	which means pending events get lost.
		325
		326	=head2 COMMON WATCHER METHODS
		327
		328	This section lists methods common to all watchers.
		329
		330	=over 4
		331
		332	=item $w->start
		333
		334	Starts a watcher if it isn't active already. Does nothing to an already
		335	active watcher. By default, all watchers start out in the active state
		336	(see the description of the C<_ns> variants if you need stopped watchers).
		337
		338	=item $w->stop
		339
		340	Stop a watcher if it is active. Also clear any pending events (events that
		341	have been received but that didn't yet result in a callback invocation),
		342	regardless of whether the watcher was active or not.
		343
		344	=item $bool = $w->is_active
		345
		346	Returns true if the watcher is active, false otherwise.
		347
		348	=item $current_data = $w->data
		349
		350	=item $old_data = $w->data ($new_data)
		351
		352	Queries a freely usable data scalar on the watcher and optionally changes
		353	it. This is a way to associate custom data with a watcher:
		354
		355	my $w = EV::timer 60, 0, sub {
		356	warn $_[0]->data;
		357	};
		358	$w->data ("print me!");
		359
		360	=item $current_cb = $w->cb
		361
		362	=item $old_cb = $w->cb ($new_cb)
		363
		364	Queries the callback on the watcher and optionally changes it. You can do
		365	this at any time without the watcher restarting.
		366
		367	=item $current_priority = $w->priority
		368
		369	=item $old_priority = $w->priority ($new_priority)
		370
		371	Queries the priority on the watcher and optionally changes it. Pending
		372	watchers with higher priority will be invoked first. The valid range of
		373	priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default
		374	-2). If the priority is outside this range it will automatically be
		375	normalised to the nearest valid priority.
		376
		377	The default priority of any newly-created watcher is 0.
		378
		379	Note that the priority semantics have not yet been fleshed out and are
		380	subject to almost certain change.
		381
		382	=item $w->invoke ($revents)
		383
		384	Call the callback now with the given event mask.
		385
		386	=item $w->feed_event ($revents)
		387
		388	Feed some events on this watcher into EV. EV will react to this call as if
		389	the watcher had received the given C<$revents> mask.
		390
		391	=item $revents = $w->clear_pending
		392
		393	If the watcher is pending, this function clears its pending status and
		394	returns its C<$revents> bitset (as if its callback was invoked). If the
		395	watcher isn't pending it does nothing and returns C<0>.
		396
		397	=item $previous_state = $w->keepalive ($bool)
		398
		399	Normally, C<EV::loop> will return when there are no active watchers
		400	(which is a "deadlock" because no progress can be made anymore). This is
		401	convinient because it allows you to start your watchers (and your jobs),
		402	call C<EV::loop> once and when it returns you know that all your jobs are
		403	finished (or they forgot to register some watchers for their task :).
		404
		405	Sometimes, however, this gets in your way, for example when the module
		406	that calls C<EV::loop> (usually the main program) is not the same module
		407	as a long-living watcher (for example a DNS client module written by
		408	somebody else even). Then you might want any outstanding requests to be
		409	handled, but you would not want to keep C<EV::loop> from returning just
		410	because you happen to have this long-running UDP port watcher.
		411
		412	In this case you can clear the keepalive status, which means that even
		413	though your watcher is active, it won't keep C<EV::loop> from returning.
		414
		415	The initial value for keepalive is true (enabled), and you cna change it
		416	any time.
		417
		418	Example: Register an I/O watcher for some UDP socket but do not keep the
		419	event loop from running just because of that watcher.
		420
		421	my $udp_socket = ...
		422	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
		423	$udp_watcher->keepalive (0);
		424
		425	=item $loop = $w->loop
		426
		427	Return the loop that this watcher is attached to.
		428
		429	=back
		430
		431
		432	=head1 WATCHER TYPES
		433
		434	Each of the following subsections describes a single watcher type.
		435
		436	=head3 I/O WATCHERS - is this file descriptor readable or writable?
		437
		438	=over 4
		439
127	=item my $w = EV::io $fileno_or_fh, $eventmask, $callback	440	=item $w = EV::io $fileno_or_fh, $eventmask, $callback
128		441
129	=item my $w = EV::io_ns $fileno_or_fh, $eventmask, $callback	442	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
		443
		444	=item $w = $loop->io ($fileno_or_fh, $eventmask, $callback)
		445
		446	=item $w = $loop->io_ns ($fileno_or_fh, $eventmask, $callback)
130		447
131	As long as the returned watcher object is alive, call the C<$callback>	448	As long as the returned watcher object is alive, call the C<$callback>
132	when the events specified in C<$eventmask> happen. Initially, the timeout	449	when at least one of events specified in C<$eventmask> occurs.
133	is disabled.
134		450
135	You can additionall set a timeout to occur on the watcher, but note that
136	this timeout will not be reset when you get an I/O event in the EV::PERSIST
137	case, and reaching a timeout will always stop the watcher even in the
138	EV::PERSIST case.
139
140	If you want a timeout to occur only after a specific time of inactivity, set
141	a repeating timeout and do NOT use EV::PERSIST.
142
143	Eventmask can be one or more of these constants ORed together:	451	The $eventmask can be one or more of these constants ORed together:
144		452
145	EV::READ wait until read() wouldn't block anymore	453	EV::READ wait until read() wouldn't block anymore
146	EV::WRITE wait until write() wouldn't block anymore	454	EV::WRITE wait until write() wouldn't block anymore
147	EV::PERSIST stay active after a (non-timeout) event occured
148		455
149	The C<io_ns> variant doesn't add/start the newly created watcher.	456	The C<io_ns> variant doesn't start (activate) the newly created watcher.
150		457
151	=item my $w = EV::timed_io $fileno_or_fh, $eventmask, $timeout, $callback	458	=item $w->set ($fileno_or_fh, $eventmask)
152		459
153	=item my $w = EV::timed_io_ns $fileno_or_fh, $eventmask, $timeout, $callback	460	Reconfigures the watcher, see the constructor above for details. Can be
		461	called at any time.
154		462
155	Same as C<io> and C<io_ns>, but also specifies a timeout (as if there was	463	=item $current_fh = $w->fh
156	a call to C<< $w->timeout ($timout, 1) >>. The persist flag is not allowed
157	and will automatically be cleared. The watcher will be restarted after each event.
158		464
159	If the timeout is zero or undef, no timeout will be set, and a normal	465	=item $old_fh = $w->fh ($new_fh)
160	watcher (with the persist flag set!) will be created.
161		466
162	This has the effect of timing out after the specified period of inactivity	467	Returns the previously set filehandle and optionally set a new one.
163	has happened.
164		468
165	Due to the design of libevent, this is also relatively inefficient, having	469	=item $current_eventmask = $w->events
166	one or two io watchers and a separate timeout watcher that you reset on
167	activity (by calling its C<start> method) is usually more efficient.
168		470
		471	=item $old_eventmask = $w->events ($new_eventmask)
		472
		473	Returns the previously set event mask and optionally set a new one.
		474
		475	=back
		476
		477
		478	=head3 TIMER WATCHERS - relative and optionally repeating timeouts
		479
		480	=over 4
		481
169	=item my $w = EV::timer $after, $repeat, $callback	482	=item $w = EV::timer $after, $repeat, $callback
170		483
171	=item my $w = EV::timer_ns $after, $repeat, $callback	484	=item $w = EV::timer_ns $after, $repeat, $callback
172		485
173	Calls the callback after C<$after> seconds. If C<$repeat> is true, the	486	=item $w = $loop->timer ($after, $repeat, $callback)
174	timer will be restarted after the callback returns. This means that the
175	callback would be called roughly every C<$after> seconds, prolonged by the
176	time the callback takes.
177		487
		488	=item $w = $loop->timer_ns ($after, $repeat, $callback)
		489
		490	Calls the callback after C<$after> seconds (which may be fractional). If
		491	C<$repeat> is non-zero, the timer will be restarted (with the $repeat
		492	value as $after) after the callback returns.
		493
		494	This means that the callback would be called roughly after C<$after>
		495	seconds, and then every C<$repeat> seconds. The timer does his best not
		496	to drift, but it will not invoke the timer more often then once per event
		497	loop iteration, and might drift in other cases. If that isn't acceptable,
		498	look at EV::periodic, which can provide long-term stable timers.
		499
		500	The timer is based on a monotonic clock, that is, if somebody is sitting
		501	in front of the machine while the timer is running and changes the system
		502	clock, the timer will nevertheless run (roughly) the same time.
		503
178	The C<timer_ns> variant doesn't add/start the newly created watcher.	504	The C<timer_ns> variant doesn't start (activate) the newly created watcher.
179		505
180	=item my $w = EV::timer_abs $at, $interval, $callback	506	=item $w->set ($after, $repeat)
181		507
182	=item my $w = EV::timer_abs_ns $at, $interval, $callback	508	Reconfigures the watcher, see the constructor above for details. Can be called at
		509	any time.
183		510
184	Similar to EV::timer, but the time is given as an absolute point in time	511	=item $w->again
185	(C<$at>), plus an optional C<$interval>.
186		512
187	If the C<$interval> is zero, then the callback will be called at the time	513	Similar to the C<start> method, but has special semantics for repeating timers:
188	C<$at> if that is in the future, or as soon as possible if its in the
189	past. It will not automatically repeat.
190		514
191	If the C<$interval> is nonzero, then the watcher will always be scheduled	515	If the timer is active and non-repeating, it will be stopped.
192	to time out at the next C<$at + integer * $interval> time.
193		516
194	This can be used to schedule a callback to run at very regular intervals,	517	If the timer is active and repeating, reset the timeout to occur
195	as long as the processing time is less then the interval (otherwise	518	C<$repeat> seconds after now.
196	obviously events will be skipped).	519
		520	If the timer is inactive and repeating, start it using the repeat value.
		521
		522	Otherwise do nothing.
		523
		524	This behaviour is useful when you have a timeout for some IO
		525	operation. You create a timer object with the same value for C<$after> and
		526	C<$repeat>, and then, in the read/write watcher, run the C<again> method
		527	on the timeout.
		528
		529	=back
		530
		531
		532	=head3 PERIODIC WATCHERS - to cron or not to cron?
		533
		534	=over 4
		535
		536	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback
		537
		538	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback
		539
		540	=item $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback)
		541
		542	=item $w = $loop->periodic_ns ($at, $interval, $reschedule_cb, $callback)
		543
		544	Similar to EV::timer, but is not based on relative timeouts but on
		545	absolute times. Apart from creating "simple" timers that trigger "at" the
		546	specified time, it can also be used for non-drifting absolute timers and
		547	more complex, cron-like, setups that are not adversely affected by time
		548	jumps (i.e. when the system clock is changed by explicit date -s or other
		549	means such as ntpd). It is also the most complex watcher type in EV.
		550
		551	It has three distinct "modes":
		552
		553	=over 4
		554
		555	=item * absolute timer ($interval = $reschedule_cb = 0)
		556
		557	This time simply fires at the wallclock time C<$at> and doesn't repeat. It
		558	will not adjust when a time jump occurs, that is, if it is to be run
		559	at January 1st 2011 then it will run when the system time reaches or
		560	surpasses this time.
		561
		562	=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
		563
		564	In this mode the watcher will always be scheduled to time out at the
		565	next C<$at + N * $interval> time (for some integer N) and then repeat,
		566	regardless of any time jumps.
		567
		568	This can be used to create timers that do not drift with respect to system
		569	time:
		570
		571	my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" };
		572
		573	That doesn't mean there will always be 3600 seconds in between triggers,
		574	but only that the the clalback will be called when the system time shows a
		575	full hour (UTC).
197		576
198	Another way to think about it (for the mathematically inclined) is that	577	Another way to think about it (for the mathematically inclined) is that
199	C<timer_abs> will try to tun the callback at the next possible time where	578	EV::periodic will try to run the callback in this mode at the next
200	C<$time = $at (mod $interval)>, regardless of any time jumps.	579	possible time where C<$time = $at (mod $interval)>, regardless of any time
		580	jumps.
201		581
		582	=item * manual reschedule mode ($reschedule_cb = coderef)
		583
		584	In this mode $interval and $at are both being ignored. Instead, each
		585	time the periodic watcher gets scheduled, the reschedule callback
		586	($reschedule_cb) will be called with the watcher as first, and the current
		587	time as second argument.
		588
		589	I<This callback MUST NOT stop or destroy this or any other periodic
		590	watcher, ever, and MUST NOT call any event loop functions or methods>. If
		591	you need to stop it, return 1e30 and stop it afterwards. You may create
		592	and start a C<EV::prepare> watcher for this task.
		593
		594	It must return the next time to trigger, based on the passed time value
		595	(that is, the lowest time value larger than or equal to to the second
		596	argument). It will usually be called just before the callback will be
		597	triggered, but might be called at other times, too.
		598
		599	This can be used to create very complex timers, such as a timer that
		600	triggers on each midnight, local time (actually 24 hours after the last
		601	midnight, to keep the example simple. If you know a way to do it correctly
		602	in about the same space (without requiring elaborate modules), drop me a
		603	note :):
		604
		605	my $daily = EV::periodic 0, 0, sub {
		606	my ($w, $now) = @_;
		607
		608	use Time::Local ();
		609	my (undef, undef, undef, $d, $m, $y) = localtime $now;
		610	86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y
		611	}, sub {
		612	print "it's midnight or likely shortly after, now\n";
		613	};
		614
		615	=back
		616
202	The C<timer_abs_ns> variant doesn't add/start the newly created watcher.	617	The C<periodic_ns> variant doesn't start (activate) the newly created watcher.
203		618
		619	=item $w->set ($at, $interval, $reschedule_cb)
		620
		621	Reconfigures the watcher, see the constructor above for details. Can be called at
		622	any time.
		623
		624	=item $w->again
		625
		626	Simply stops and starts the watcher again.
		627
		628	=item $time = $w->at
		629
		630	Return the time that the watcher is expected to trigger next.
		631
		632	=back
		633
		634
		635	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!
		636
		637	=over 4
		638
204	=item my $w = EV::signal $signal, $callback	639	=item $w = EV::signal $signal, $callback
205		640
206	=item my $w = EV::signal_ns $signal, $callback	641	=item $w = EV::signal_ns $signal, $callback
207		642
208	Call the callback when $signal is received (the signal can be specified	643	Call the callback when $signal is received (the signal can be specified by
209	by number or by name, just as with kill or %SIG). Signal watchers are	644	number or by name, just as with C<kill> or C<%SIG>).
210	persistent no natter what.
211		645
212	EV will grab the signal for the process (the kernel only allows one	646	EV will grab the signal for the process (the kernel only allows one
213	component to receive signals) when you start a signal watcher, and	647	component to receive a signal at a time) when you start a signal watcher,
214	removes it again when you stop it. Pelr does the same when you add/remove	648	and removes it again when you stop it. Perl does the same when you
215	callbacks to %SIG, so watch out.	649	add/remove callbacks to C<%SIG>, so watch out.
216		650
217	Unfortunately, only one handler can be registered per signal. Screw	651	You can have as many signal watchers per signal as you want.
218	libevent.
219		652
220	The C<signal_ns> variant doesn't add/start the newly created watcher.	653	The C<signal_ns> variant doesn't start (activate) the newly created watcher.
221		654
222	=back	655	=item $w->set ($signal)
223		656
224	=head1 THE EV::Event CLASS	657	Reconfigures the watcher, see the constructor above for details. Can be
		658	called at any time.
225		659
226	All EV functions creating an event watcher (designated by C<my $w =>
227	above) support the following methods on the returned watcher object:
228
229	=over 4
230
231	=item $w->add ($timeout)
232
233	Stops and (re-)starts the event watcher, setting the optional timeout to
234	the given value, or clearing the timeout if none is given.
235
236	=item $w->start
237
238	Stops and (re-)starts the event watcher without touching the timeout.
239
240	=item $w->del
241
242	=item $w->stop
243
244	Stop the event watcher if it was started.
245
246	=item $current_callback = $w->cb
247
248	=item $old_callback = $w->cb ($new_callback)
249
250	Return the previously set callback and optionally set a new one.
251
252	=item $current_fh = $w->fh
253
254	=item $old_fh = $w->fh ($new_fh)
255
256	Returns the previously set filehandle and optionally set a new one (also
257	clears the EV::SIGNAL flag when setting a filehandle).
258
259	=item $current_signal = $w->signal	660	=item $current_signum = $w->signal
260		661
261	=item $old_signal = $w->signal ($new_signal)	662	=item $old_signum = $w->signal ($new_signal)
262		663
		664	Returns the previously set signal (always as a number not name) and
		665	optionally set a new one.
		666
		667	=back
		668
		669
		670	=head3 CHILD WATCHERS - watch out for process status changes
		671
		672	=over 4
		673
		674	=item $w = EV::child $pid, $trace, $callback
		675
		676	=item $w = EV::child_ns $pid, $trace, $callback
		677
		678	=item $w = $loop->child ($pid, $trace, $callback)
		679
		680	=item $w = $loop->child_ns ($pid, $trace, $callback)
		681
		682	Call the callback when a status change for pid C<$pid> (or any pid
		683	if C<$pid> is 0) has been received (a status change happens when the
		684	process terminates or is killed, or, when trace is true, additionally when
		685	it is stopped or continued). More precisely: when the process receives
		686	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all
		687	changed/zombie children and call the callback.
		688
		689	It is valid (and fully supported) to install a child watcher after a child
		690	has exited but before the event loop has started its next iteration (for
		691	example, first you C<fork>, then the new child process might exit, and
		692	only then do you install a child watcher in the parent for the new pid).
		693
		694	You can access both exit (or tracing) status and pid by using the
		695	C<rstatus> and C<rpid> methods on the watcher object.
		696
		697	You can have as many pid watchers per pid as you want, they will all be
		698	called.
		699
		700	The C<child_ns> variant doesn't start (activate) the newly created watcher.
		701
		702	=item $w->set ($pid, $trace)
		703
		704	Reconfigures the watcher, see the constructor above for details. Can be called at
		705	any time.
		706
		707	=item $current_pid = $w->pid
		708
263	Returns the previously set signal number and optionally set a new one (also sets	709	Returns the previously set process id and optionally set a new one.
264	the EV::SIGNAL flag when setting a signal).
265		710
266	=item $current_eventmask = $w->events	711	=item $exit_status = $w->rstatus
267		712
268	=item $old_eventmask = $w->events ($new_eventmask)	713	Return the exit/wait status (as returned by waitpid, see the waitpid entry
		714	in perlfunc).
269		715
		716	=item $pid = $w->rpid
		717
		718	Return the pid of the awaited child (useful when you have installed a
		719	watcher for all pids).
		720
		721	=back
		722
		723
		724	=head3 STAT WATCHERS - did the file attributes just change?
		725
		726	=over 4
		727
		728	=item $w = EV::stat $path, $interval, $callback
		729
		730	=item $w = EV::stat_ns $path, $interval, $callback
		731
		732	=item $w = $loop->stat ($path, $interval, $callback)
		733
		734	=item $w = $loop->stat_ns ($path, $interval, $callback)
		735
		736	Call the callback when a file status change has been detected on
		737	C<$path>. The C<$path> does not need to exist, changing from "path exists"
		738	to "path does not exist" is a status change like any other.
		739
		740	The C<$interval> is a recommended polling interval for systems where
		741	OS-supported change notifications don't exist or are not supported. If
		742	you use C<0> then an unspecified default is used (which is highly
		743	recommended!), which is to be expected to be around five seconds usually.
		744
		745	This watcher type is not meant for massive numbers of stat watchers,
		746	as even with OS-supported change notifications, this can be
		747	resource-intensive.
		748
		749	The C<stat_ns> variant doesn't start (activate) the newly created watcher.
		750
		751	=item ... = $w->stat
		752
		753	This call is very similar to the perl C<stat> built-in: It stats (using
		754	C<lstat>) the path specified in the watcher and sets perls stat cache (as
		755	well as EV's idea of the current stat values) to the values found.
		756
		757	In scalar context, a boolean is return indicating success or failure of
		758	the stat. In list context, the same 13-value list as with stat is returned
		759	(except that the blksize and blocks fields are not reliable).
		760
		761	In the case of an error, errno is set to C<ENOENT> (regardless of the
		762	actual error value) and the C<nlink> value is forced to zero (if the stat
		763	was successful then nlink is guaranteed to be non-zero).
		764
		765	See also the next two entries for more info.
		766
		767	=item ... = $w->attr
		768
		769	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		770	the values most recently detected by EV. See the next entry for more info.
		771
		772	=item ... = $w->prev
		773
		774	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		775	the previous set of values, before the change.
		776
		777	That is, when the watcher callback is invoked, C<< $w->prev >> will be set
		778	to the values found I<before> a change was detected, while C<< $w->attr >>
		779	returns the values found leading to the change detection. The difference (if any)
		780	between C<prev> and C<attr> is what triggered the callback.
		781
		782	If you did something to the filesystem object and do not want to trigger
		783	yet another change, you can call C<stat> to update EV's idea of what the
		784	current attributes are.
		785
		786	=item $w->set ($path, $interval)
		787
		788	Reconfigures the watcher, see the constructor above for details. Can be
		789	called at any time.
		790
		791	=item $current_path = $w->path
		792
		793	=item $old_path = $w->path ($new_path)
		794
270	Returns the previously set event mask and optionally set a new one.	795	Returns the previously set path and optionally set a new one.
271		796
272	=item $w->timeout ($after, $repeat)	797	=item $current_interval = $w->interval
273		798
274	Resets the timeout (see C<EV::timer> for details).	799	=item $old_interval = $w->interval ($new_interval)
275		800
276	=item $w->timeout_abs ($at, $interval)	801	Returns the previously set interval and optionally set a new one. Can be
		802	used to query the actual interval used.
277		803
278	Resets the timeout (see C<EV::timer_abs> for details).
279
280	=item $w->priority_set ($priority)
281
282	Set the priority of the watcher to C<$priority> (0 <= $priority < $EV::NPRI).
283
284	=back	804	=back
285		805
286	=head1 BUGS
287		806
288	Lots. Libevent itself isn't well tested and rather buggy, and this module	807	=head3 IDLE WATCHERS - when you've got nothing better to do...
289	is quite new at the moment.
290		808
291	Please note that the epoll method is not, in general, reliable in programs	809	=over 4
292	that use fork (even if no libveent calls are being made in the forked
293	process). If your program behaves erratically, try setting the environment
294	variable C<EVENT_NOEPOLL> first when running the program.
295		810
296	In general, if you fork, then you can only use the EV module in one of the	811	=item $w = EV::idle $callback
297	children.	812
		813	=item $w = EV::idle_ns $callback
		814
		815	=item $w = $loop->idle ($callback)
		816
		817	=item $w = $loop->idle_ns ($callback)
		818
		819	Call the callback when there are no other pending watchers of the same or
		820	higher priority (excluding check, prepare and other idle watchers of the
		821	same or lower priority, of course). They are called idle watchers because
		822	when the watcher is the highest priority pending event in the process, the
		823	process is considered to be idle at that priority.
		824
		825	If you want a watcher that is only ever called when I<no> other events are
		826	outstanding you have to set the priority to C<EV::MINPRI>.
		827
		828	The process will not block as long as any idle watchers are active, and
		829	they will be called repeatedly until stopped.
		830
		831	For example, if you have idle watchers at priority C<0> and C<1>, and
		832	an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
		833	and the I/O watcher will always run when ready. Only when the idle watcher
		834	at priority C<1> is stopped and the I/O watcher at priority C<0> is not
		835	pending with the C<0>-priority idle watcher be invoked.
		836
		837	The C<idle_ns> variant doesn't start (activate) the newly created watcher.
		838
		839	=back
		840
		841
		842	=head3 PREPARE WATCHERS - customise your event loop!
		843
		844	=over 4
		845
		846	=item $w = EV::prepare $callback
		847
		848	=item $w = EV::prepare_ns $callback
		849
		850	=item $w = $loop->prepare ($callback)
		851
		852	=item $w = $loop->prepare_ns ($callback)
		853
		854	Call the callback just before the process would block. You can still
		855	create/modify any watchers at this point.
		856
		857	See the EV::check watcher, below, for explanations and an example.
		858
		859	The C<prepare_ns> variant doesn't start (activate) the newly created watcher.
		860
		861	=back
		862
		863
		864	=head3 CHECK WATCHERS - customise your event loop even more!
		865
		866	=over 4
		867
		868	=item $w = EV::check $callback
		869
		870	=item $w = EV::check_ns $callback
		871
		872	=item $w = $loop->check ($callback)
		873
		874	=item $w = $loop->check_ns ($callback)
		875
		876	Call the callback just after the process wakes up again (after it has
		877	gathered events), but before any other callbacks have been invoked.
		878
		879	This is used to integrate other event-based software into the EV
		880	mainloop: You register a prepare callback and in there, you create io and
		881	timer watchers as required by the other software. Here is a real-world
		882	example of integrating Net::SNMP (with some details left out):
		883
		884	our @snmp_watcher;
		885
		886	our $snmp_prepare = EV::prepare sub {
		887	# do nothing unless active
		888	$dispatcher->{_event_queue_h}
		889	or return;
		890
		891	# make the dispatcher handle any outstanding stuff
		892	... not shown
		893
		894	# create an I/O watcher for each and every socket
		895	@snmp_watcher = (
		896	(map { EV::io $_, EV::READ, sub { } }
		897	keys %{ $dispatcher->{_descriptors} }),
		898
		899	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
		900	? $event->[Net::SNMP::Dispatcher::_TIME] - EV::now : 0),
		901	0, sub { },
		902	);
		903	};
		904
		905	The callbacks are irrelevant (and are not even being called), the
		906	only purpose of those watchers is to wake up the process as soon as
		907	one of those events occurs (socket readable, or timer timed out). The
		908	corresponding EV::check watcher will then clean up:
		909
		910	our $snmp_check = EV::check sub {
		911	# destroy all watchers
		912	@snmp_watcher = ();
		913
		914	# make the dispatcher handle any new stuff
		915	... not shown
		916	};
		917
		918	The callbacks of the created watchers will not be called as the watchers
		919	are destroyed before this cna happen (remember EV::check gets called
		920	first).
		921
		922	The C<check_ns> variant doesn't start (activate) the newly created watcher.
		923
		924	=back
		925
		926
		927	=head3 FORK WATCHERS - the audacity to resume the event loop after a fork
		928
		929	Fork watchers are called when a C<fork ()> was detected. The invocation
		930	is done before the event loop blocks next and before C<check> watchers
		931	are being called, and only in the child after the fork.
		932
		933	=over 4
		934
		935	=item $w = EV::fork $callback
		936
		937	=item $w = EV::fork_ns $callback
		938
		939	=item $w = $loop->fork ($callback)
		940
		941	=item $w = $loop->fork_ns ($callback)
		942
		943	Call the callback before the event loop is resumed in the child process
		944	after a fork.
		945
		946	The C<fork_ns> variant doesn't start (activate) the newly created watcher.
		947
		948	=back
		949
		950
		951	=head3 EMBED WATCHERS - when one backend isn't enough...
		952
		953	This is a rather advanced watcher type that lets you embed one event loop
		954	into another (currently only IO events are supported in the embedded
		955	loop, other types of watchers might be handled in a delayed or incorrect
		956	fashion and must not be used).
		957
		958	See the libev documentation at
		959	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
		960	for more details.
		961
		962	In short, this watcher is most useful on BSD systems without working
		963	kqueue to still be able to handle a large number of sockets:
		964
		965	my $socket_loop;
		966
		967	# check wether we use SELECT or POLL _and_ KQUEUE is supported
		968	if (
		969	(EV::backend & (EV::BACKEND_POLL \| EV::BACKEND_SELECT))
		970	&& (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
		971	) {
		972	# use kqueue for sockets
		973	$socket_loop = new EV::Loop EV::BACKEND_KQUEUE \| EV::FLAG_NOENV;
		974	}
		975
		976	# use the default loop otherwise
		977	$socket_loop \|\|= EV::default_loop;
		978
		979	=over 4
		980
		981	=item $w = EV::embed $otherloop[, $callback]
		982
		983	=item $w = EV::embed_ns $otherloop[, $callback]
		984
		985	=item $w = $loop->embed ($otherloop[, $callback])
		986
		987	=item $w = $loop->embed_ns ($otherloop[, $callback])
		988
		989	Call the callback when the embedded event loop (C<$otherloop>) has any
		990	I/O activity. The C<$callback> is optional: if it is missing, then the
		991	embedded event loop will be managed automatically (which is recommended),
		992	otherwise you have to invoke C<sweep> yourself.
		993
		994	The C<embed_ns> variant doesn't start (activate) the newly created watcher.
		995
		996	=back
		997
		998	=head3 ASYNC WATCHERS - how to wake up another event loop
		999
		1000	Async watchers are provided by EV, but have little use in perl directly, as perl
		1001	neither supports threads nor direct access to signal handlers or other
		1002	contexts where they could be of value.
		1003
		1004	It is, however, possible to use them from the XS level.
		1005
		1006	Please see the libev documentation for further details.
		1007
		1008	=over 4
		1009
		1010	=item $w = EV::async $callback
		1011
		1012	=item $w = EV::async_ns $callback
		1013
		1014	=item $w->send
		1015
		1016	=item $bool = $w->async_pending
		1017
		1018	=back
		1019
		1020
		1021	=head1 PERL SIGNALS
		1022
		1023	While Perl signal handling (C<%SIG>) is not affected by EV, the behaviour
		1024	with EV is as the same as any other C library: Perl-signals will only be
		1025	handled when Perl runs, which means your signal handler might be invoked
		1026	only the next time an event callback is invoked.
		1027
		1028	The solution is to use EV signal watchers (see C<EV::signal>), which will
		1029	ensure proper operations with regards to other event watchers.
		1030
		1031	If you cannot do this for whatever reason, you can also force a watcher
		1032	to be called on every event loop iteration by installing a C<EV::check>
		1033	watcher:
		1034
		1035	my $async_check = EV::check sub { };
		1036
		1037	This ensures that perl gets into control for a short time to handle any
		1038	pending signals, and also ensures (slightly) slower overall operation.
		1039
		1040	=head1 THREADS
		1041
		1042	Threads are not supported by this module in any way. Perl pseudo-threads
		1043	is evil stuff and must die. As soon as Perl gains real threads I will work
		1044	on thread support for it.
		1045
		1046	=head1 FORK
		1047
		1048	Most of the "improved" event delivering mechanisms of modern operating
		1049	systems have quite a few problems with fork(2) (to put it bluntly: it is
		1050	not supported and usually destructive). Libev makes it possible to work
		1051	around this by having a function that recreates the kernel state after
		1052	fork in the child.
		1053
		1054	On non-win32 platforms, this module requires the pthread_atfork
		1055	functionality to do this automatically for you. This function is quite
		1056	buggy on most BSDs, though, so YMMV. The overhead for this is quite
		1057	negligible, because everything the function currently does is set a flag
		1058	that is checked only when the event loop gets used the next time, so when
		1059	you do fork but not use EV, the overhead is minimal.
		1060
		1061	On win32, there is no notion of fork so all this doesn't apply, of course.
298		1062
299	=cut	1063	=cut
300		1064
301	our $DIED = sub {	1065	our $DIED = sub {
302	warn "EV: error in callback (ignoring): $@";	1066	warn "EV: error in callback (ignoring): $@";
303	};	1067	};
304		1068
305	our $NPRI = 4;	1069	default_loop
306	our $BASE = init;	1070	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?';
307	priority_init $NPRI;
308
309	push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"];
310		1071
311	1;	1072	1;
312		1073
313	=head1 SEE ALSO	1074	=head1 SEE ALSO
314		1075
315	L<EV::DNS>, L<event(3)>, L<event.h>, L<evdns.h>.	1076	L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as
316	L<EV::AnyEvent>.	1077	event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient
		1078	coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
		1079	event-loop agnostic and portable event driven programming.
317		1080
318	=head1 AUTHOR	1081	=head1 AUTHOR
319		1082
320	Marc Lehmann <schmorp@schmorp.de>	1083	Marc Lehmann <schmorp@schmorp.de>
321	http://home.schmorp.de/	1084	http://home.schmorp.de/
322		1085
323	=cut	1086	=cut
324		1087

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Comparing EV/EV.pm (file contents): Revision 1.12 by root, Mon Oct 29 08:52:28 2007 UTC vs. Revision 1.102 by root, Mon Sep 8 17:27:42 2008 UTC

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Comparing EV/EV.pm (file contents):
Revision 1.12 by root, Mon Oct 29 08:52:28 2007 UTC vs.
Revision 1.102 by root, Mon Sep 8 17:27:42 2008 UTC