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

Comparing EV/EV.pm (file contents):
Revision 1.20 by root, Thu Nov 1 17:17:32 2007 UTC vs.
Revision 1.87 by root, Tue Apr 15 04:41:57 2008 UTC

…		…
10		10
11	my $w = EV::timer 2, 0, sub {	11	my $w = EV::timer 2, 0, sub {
12	warn "is called after 2s";	12	warn "is called after 2s";
13	};	13	};
14		14
15	my $w = EV::timer 2, 1, sub {	15	my $w = EV::timer 2, 2, sub {
16	warn "is called roughly every 2s (repeat = 1)";	16	warn "is called roughly every 2s (repeat = 2)";
17	};	17	};
18		18
19	undef $w; # destroy event watcher again	19	undef $w; # destroy event watcher again
20		20
21	my $w = EV::periodic 0, 60, sub {	21	my $w = EV::periodic 0, 60, 0, sub {
22	warn "is called every minute, on the minute, exactly";	22	warn "is called every minute, on the minute, exactly";
23	};	23	};
24		24
25	# IO	25	# IO
26		26
27	my $w = EV::io *STDIN, EV::READ, sub {	27	my $w = EV::io *STDIN, EV::READ, sub {
28	my ($w, $revents) = @_; # all callbacks get the watcher object and event mask	28	my ($w, $revents) = @_; # all callbacks receive the watcher and event mask
29	warn "stdin is readable, you entered: ", <STDIN>;	29	warn "stdin is readable, you entered: ", <STDIN>;
30	};	30	};
31		31
32	# SIGNALS	32	# SIGNALS
33		33
34	my $w = EV::signal 'QUIT', sub {	34	my $w = EV::signal 'QUIT', sub {
35	warn "sigquit received\n";	35	warn "sigquit received\n";
36	};	36	};
37		37
38	my $w = EV::signal 3, sub {	38	# CHILD/PID STATUS CHANGES
39	warn "sigquit received (this is GNU/Linux, right?)\n";	39
		40	my $w = EV::child 666, 0, sub {
		41	my ($w, $revents) = @_;
		42	my $status = $w->rstatus;
40	};	43	};
41		44
42	# CHILD/PID STATUS CHANGES	45	# STAT CHANGES
43		46	my $w = EV::stat "/etc/passwd", 10, sub {
44	my $w = EV::child 666, sub {
45	my ($w, $revents, $status) = @_;	47	my ($w, $revents) = @_;
		48	warn $w->path, " has changed somehow.\n";
46	};	49	};
47		50
48	# MAINLOOP	51	# MAINLOOP
49	EV::loop; # loop until EV::loop_done is called	52	EV::loop; # loop until EV::unloop is called or all watchers stop
50	EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled	53	EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled
51	EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block	54	EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
52		55
53	=head1 DESCRIPTION	56	=head1 DESCRIPTION
54		57
55	This module provides an interface to libev	58	This module provides an interface to libev
56	(L<http://software.schmorp.de/pkg/libev.html>).	59	(L<http://software.schmorp.de/pkg/libev.html>). While the documentation
		60	below is comprehensive, one might also consult the documentation of libev
		61	itself (L<http://cvs.schmorp.de/libev/ev.html>) for more subtle details on
		62	watcher semantics or some discussion on the available backends, or how to
		63	force a specific backend with C<LIBEV_FLAGS>, or just about in any case
		64	because it has much more detailed information.
57		65
58	=cut	66	=cut
59		67
60	package EV;	68	package EV;
61		69
62	use strict;	70	use strict;
63		71
64	BEGIN {	72	BEGIN {
65	our $VERSION = '0.1';	73	our $VERSION = '3.2';
66	use XSLoader;	74	use XSLoader;
67	XSLoader::load "EV", $VERSION;	75	XSLoader::load "EV", $VERSION;
68	}	76	}
69		77
70	@EV::Io::ISA =	78	@EV::IO::ISA =
71	@EV::Timer::ISA =	79	@EV::Timer::ISA =
72	@EV::Periodic::ISA =	80	@EV::Periodic::ISA =
73	@EV::Signal::ISA =	81	@EV::Signal::ISA =
		82	@EV::Child::ISA =
		83	@EV::Stat::ISA =
74	@EV::Idle::ISA =	84	@EV::Idle::ISA =
75	@EV::Prepare::ISA =	85	@EV::Prepare::ISA =
76	@EV::Check::ISA =	86	@EV::Check::ISA =
77	@EV::Child::ISA = "EV::Watcher";	87	@EV::Embed::ISA =
		88	@EV::Fork::ISA =
		89	@EV::Async::ISA =
		90	"EV::Watcher";
		91
		92	@EV::Loop::Default::ISA = "EV::Loop";
		93
		94	=head1 EVENT LOOPS
		95
		96	EV supports multiple event loops: There is a single "default event loop"
		97	that can handle everything including signals and child watchers, and any
		98	number of "dynamic event loops" that can use different backends (with
		99	various limitations), but no child and signal watchers.
		100
		101	You do not have to do anything to create the default event loop: When
		102	the module is loaded a suitable backend is selected on the premise of
		103	selecting a working backend (which for example rules out kqueue on most
		104	BSDs). Modules should, unless they have "special needs" always use the
		105	default loop as this is fastest (perl-wise), best supported by other
		106	modules (e.g. AnyEvent or Coro) and most portable event loop.
		107
		108	For specific programs you can create additional event loops dynamically.
		109
		110	=over 4
		111
		112	=item $loop = new EV::loop [$flags]
		113
		114	Create a new event loop as per the specified flags. Please refer to the
		115	C<ev_loop_new ()> function description in the libev documentation
		116	(L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>)
		117	for more info.
		118
		119	The loop will automatically be destroyed when it is no longer referenced
		120	by any watcher and the loop object goes out of scope.
		121
		122	Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop
		123	is protected by this module.
		124
		125	=item $loop->loop_fork
		126
		127	Must be called after a fork in the child, before entering or continuing
		128	the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls
		129	this fucntion automatically, at some performance loss (refer to the libev
		130	documentation).
		131
		132	=item $loop = EV::default_loop [$flags]
		133
		134	Return the default loop (which is a singleton object).
		135
		136	=back
		137
78		138
79	=head1 BASIC INTERFACE	139	=head1 BASIC INTERFACE
80		140
81	=over 4	141	=over 4
82		142
83	=item $EV::DIED	143	=item $EV::DIED
84		144
85	Must contain a reference to a function that is called when a callback	145	Must contain a reference to a function that is called when a callback
86	throws an exception (with $@ containing thr error). The default prints an	146	throws an exception (with $@ containing the error). The default prints an
87	informative message and continues.	147	informative message and continues.
88		148
89	If this callback throws an exception it will be silently ignored.	149	If this callback throws an exception it will be silently ignored.
90		150
		151	=item $flags = EV::supported_backends
		152
		153	=item $flags = EV::recommended_backends
		154
		155	=item $flags = EV::embeddable_backends
		156
		157	Returns the set (see C<EV::BACKEND_*> flags) of backends supported by this
		158	instance of EV, the set of recommended backends (supposed to be good) for
		159	this platform and the set of embeddable backends (see EMBED WATCHERS).
		160
		161	=item EV::sleep $seconds
		162
		163	Block the process for the given number of (fractional) seconds.
		164
91	=item $time = EV::time	165	=item $time = EV::time
92		166
93	Returns the current time in (fractional) seconds since the epoch.	167	Returns the current time in (fractional) seconds since the epoch.
94		168
95	=item $time = EV::now	169	=item $time = EV::now
		170
		171	=item $time = $loop->now
96		172
97	Returns the time the last event loop iteration has been started. This	173	Returns the time the last event loop iteration has been started. This
98	is the time that (relative) timers are based on, and refering to it is	174	is the time that (relative) timers are based on, and refering to it is
99	usually faster then calling EV::time.	175	usually faster then calling EV::time.
100		176
101	=item $method = EV::ev_method	177	=item $backend = EV::backend
		178
		179	=item $backend = $loop->backend
102		180
103	Returns an integer describing the backend used by libev (EV::METHOD_SELECT	181	Returns an integer describing the backend used by libev (EV::METHOD_SELECT
104	or EV::METHOD_EPOLL).	182	or EV::METHOD_EPOLL).
105		183
106	=item EV::loop [$flags]	184	=item EV::loop [$flags]
107		185
		186	=item $loop->loop ([$flags])
		187
108	Begin checking for events and calling callbacks. It returns when a	188	Begin checking for events and calling callbacks. It returns when a
109	callback calls EV::loop_done.	189	callback calls EV::unloop.
110		190
111	The $flags argument can be one of the following:	191	The $flags argument can be one of the following:
112		192
113	0 as above	193	0 as above
114	EV::LOOP_ONESHOT block at most once (wait, but do not loop)	194	EV::LOOP_ONESHOT block at most once (wait, but do not loop)
115	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)	195	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
116		196
117	=item EV::loop_done [$how]	197	=item EV::unloop [$how]
118		198
		199	=item $loop->unloop ([$how])
		200
119	When called with no arguments or an argument of 1, makes the innermost	201	When called with no arguments or an argument of EV::UNLOOP_ONE, makes the
120	call to EV::loop return.	202	innermost call to EV::loop return.
121		203
122	When called with an agrument of 2, all calls to EV::loop will return as	204	When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as
123	fast as possible.	205	fast as possible.
124		206
125	=back	207	=item $count = EV::loop_count
126		208
127	=head2 WATCHER	209	=item $count = $loop->loop_count
		210
		211	Return the number of times the event loop has polled for new
		212	events. Sometiems useful as a generation counter.
		213
		214	=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
		215
		216	=item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents))
		217
		218	This function rolls together an I/O and a timer watcher for a single
		219	one-shot event without the need for managing a watcher object.
		220
		221	If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events>
		222	must be a bitset containing either C<EV::READ>, C<EV::WRITE> or C<EV::READ
		223	\| EV::WRITE>, indicating the type of I/O event you want to wait for. If
		224	you do not want to wait for some I/O event, specify C<undef> for
		225	C<$fh_or_undef> and C<0> for C<$events>).
		226
		227	If timeout is C<undef> or negative, then there will be no
		228	timeout. Otherwise a EV::timer with this value will be started.
		229
		230	When an error occurs or either the timeout or I/O watcher triggers, then
		231	the callback will be called with the received event set (in general
		232	you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
		233	C<EV::WRITE> and C<EV::TIMEOUT>).
		234
		235	EV::once doesn't return anything: the watchers stay active till either
		236	of them triggers, then they will be stopped and freed, and the callback
		237	invoked.
		238
		239	=item EV::feed_fd_event ($fd, $revents)
		240
		241	=item $loop->feed_fd_event ($fd, $revents)
		242
		243	Feed an event on a file descriptor into EV. EV will react to this call as
		244	if the readyness notifications specified by C<$revents> (a combination of
		245	C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>.
		246
		247	=item EV::feed_signal_event ($signal)
		248
		249	Feed a signal event into EV. EV will react to this call as if the signal
		250	specified by C<$signal> had occured.
		251
		252	=item EV::set_io_collect_interval $time
		253
		254	=item $loop->set_io_collect_interval ($time)
		255
		256	=item EV::set_timeout_collect_interval $time
		257
		258	=item $loop->set_timeout_collect_interval ($time)
		259
		260	These advanced functions set the minimum block interval when polling for I/O events and the minimum
		261	wait interval for timer events. See the libev documentation at
		262	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for
		263	a more detailed discussion.
		264
		265	=back
		266
		267
		268	=head1 WATCHER OBJECTS
128		269
129	A watcher is an object that gets created to record your interest in some	270	A watcher is an object that gets created to record your interest in some
130	event. For instance, if you want to wait for STDIN to become readable, you	271	event. For instance, if you want to wait for STDIN to become readable, you
131	would create an EV::io watcher for that:	272	would create an EV::io watcher for that:
132		273
133	my $watcher = EV::io *STDIN, EV::READ, sub {	274	my $watcher = EV::io *STDIN, EV::READ, sub {
134	my ($watcher, $revents) = @_;	275	my ($watcher, $revents) = @_;
135	warn "yeah, STDIN should not be readable without blocking!\n"	276	warn "yeah, STDIN should now be readable without blocking!\n"
136	};	277	};
137		278
138	All watchers can be active (waiting for events) or inactive (paused). Only	279	All watchers can be active (waiting for events) or inactive (paused). Only
139	active watchers will have their callbacks invoked. All callbacks will be	280	active watchers will have their callbacks invoked. All callbacks will be
140	called with at least two arguments: the watcher and a bitmask of received	281	called with at least two arguments: the watcher and a bitmask of received
141	events.	282	events.
142		283
143	Each watcher type has its associated bit in revents, so you can use the	284	Each watcher type has its associated bit in revents, so you can use the
144	same callback for multiple watchers. The event mask is named after the	285	same callback for multiple watchers. The event mask is named after the
145	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,	286	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
146	EV::periodic sets EV::PERIODIC and so on, with the exception of IO events	287	EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events
147	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which	288	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
148	uses EV::TIMEOUT).	289	uses EV::TIMEOUT).
149		290
150	In the rare case where one wants to create a watcher but not start it at	291	In the rare case where one wants to create a watcher but not start it at
151	the same time, each constructor has a variant with a trailing C<_ns> in	292	the same time, each constructor has a variant with a trailing C<_ns> in
152	its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.	293	its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
153		294
154	Please note that a watcher will automatically be stopped when the watcher	295	Please note that a watcher will automatically be stopped when the watcher
155	object is returned, so you I<need> to keep the watcher objects returned by	296	object is destroyed, so you I<need> to keep the watcher objects returned by
156	the constructors.	297	the constructors.
157		298
158	=head2 WATCHER TYPES	299	Also, all methods changing some aspect of a watcher (->set, ->priority,
		300	->fh and so on) automatically stop and start it again if it is active,
		301	which means pending events get lost.
159		302
160	Now lets move to the existing watcher types and asociated methods.	303	=head2 COMMON WATCHER METHODS
161		304
162	The following methods are available for all watchers. Then followes a	305	This section lists methods common to all watchers.
163	description of each watcher constructor (EV::io, EV::timer, EV::periodic,
164	EV::signal, EV::child, EV::idle, EV::prepare and EV::check), followed by
165	any type-specific methods (if any).
166		306
167	=over 4	307	=over 4
168		308
169	=item $w->start	309	=item $w->start
170		310
…		…
174		314
175	=item $w->stop	315	=item $w->stop
176		316
177	Stop a watcher if it is active. Also clear any pending events (events that	317	Stop a watcher if it is active. Also clear any pending events (events that
178	have been received but that didn't yet result in a callback invocation),	318	have been received but that didn't yet result in a callback invocation),
179	regardless of wether the watcher was active or not.	319	regardless of whether the watcher was active or not.
180		320
181	=item $bool = $w->is_active	321	=item $bool = $w->is_active
182		322
183	Returns true if the watcher is active, false otherwise.	323	Returns true if the watcher is active, false otherwise.
184		324
		325	=item $current_data = $w->data
		326
		327	=item $old_data = $w->data ($new_data)
		328
		329	Queries a freely usable data scalar on the watcher and optionally changes
		330	it. This is a way to associate custom data with a watcher:
		331
		332	my $w = EV::timer 60, 0, sub {
		333	warn $_[0]->data;
		334	};
		335	$w->data ("print me!");
		336
185	=item $current_cb = $w->cb	337	=item $current_cb = $w->cb
186		338
187	=item $old_cb = $w->cb ($new_cb)	339	=item $old_cb = $w->cb ($new_cb)
188		340
189	Queries the callback on the watcher and optionally changes it. You cna do	341	Queries the callback on the watcher and optionally changes it. You can do
190	this at any time.	342	this at any time without the watcher restarting.
191		343
		344	=item $current_priority = $w->priority
		345
		346	=item $old_priority = $w->priority ($new_priority)
		347
		348	Queries the priority on the watcher and optionally changes it. Pending
		349	watchers with higher priority will be invoked first. The valid range of
		350	priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default
		351	-2). If the priority is outside this range it will automatically be
		352	normalised to the nearest valid priority.
		353
		354	The default priority of any newly-created watcher is 0.
		355
		356	Note that the priority semantics have not yet been fleshed out and are
		357	subject to almost certain change.
		358
192	=item $w->trigger ($revents)	359	=item $w->invoke ($revents)
193		360
194	Call the callback now with the given event mask.	361	Call the callback now with the given event mask.
195		362
		363	=item $w->feed_event ($revents)
		364
		365	Feed some events on this watcher into EV. EV will react to this call as if
		366	the watcher had received the given C<$revents> mask.
		367
		368	=item $revents = $w->clear_pending
		369
		370	If the watcher is pending, this function clears its pending status and
		371	returns its C<$revents> bitset (as if its callback was invoked). If the
		372	watcher isn't pending it does nothing and returns C<0>.
		373
		374	=item $previous_state = $w->keepalive ($bool)
		375
		376	Normally, C<EV::loop> will return when there are no active watchers
		377	(which is a "deadlock" because no progress can be made anymore). This is
		378	convinient because it allows you to start your watchers (and your jobs),
		379	call C<EV::loop> once and when it returns you know that all your jobs are
		380	finished (or they forgot to register some watchers for their task :).
		381
		382	Sometimes, however, this gets in your way, for example when the module
		383	that calls C<EV::loop> (usually the main program) is not the same module
		384	as a long-living watcher (for example a DNS client module written by
		385	somebody else even). Then you might want any outstanding requests to be
		386	handled, but you would not want to keep C<EV::loop> from returning just
		387	because you happen to have this long-running UDP port watcher.
		388
		389	In this case you can clear the keepalive status, which means that even
		390	though your watcher is active, it won't keep C<EV::loop> from returning.
		391
		392	The initial value for keepalive is true (enabled), and you cna change it
		393	any time.
		394
		395	Example: Register an I/O watcher for some UDP socket but do not keep the
		396	event loop from running just because of that watcher.
		397
		398	my $udp_socket = ...
		399	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
		400	$1000udp_watcher->keepalive (0);
		401
		402	=item $loop = $w->loop
		403
		404	Return the loop that this watcher is attached to.
		405
		406	=back
		407
		408
		409	=head1 WATCHER TYPES
		410
		411	Each of the following subsections describes a single watcher type.
		412
		413	=head3 I/O WATCHERS - is this file descriptor readable or writable?
		414
		415	=over 4
196		416
197	=item $w = EV::io $fileno_or_fh, $eventmask, $callback	417	=item $w = EV::io $fileno_or_fh, $eventmask, $callback
198		418
199	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback	419	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
200		420
		421	=item $w = $loop->io ($fileno_or_fh, $eventmask, $callback)
		422
		423	=item $w = $loop->io_ns ($fileno_or_fh, $eventmask, $callback)
		424
201	As long as the returned watcher object is alive, call the C<$callback>	425	As long as the returned watcher object is alive, call the C<$callback>
202	when the events specified in C<$eventmask>.	426	when at least one of events specified in C<$eventmask> occurs.
203		427
204	The $eventmask can be one or more of these constants ORed together:	428	The $eventmask can be one or more of these constants ORed together:
205		429
206	EV::READ wait until read() wouldn't block anymore	430	EV::READ wait until read() wouldn't block anymore
207	EV::WRITE wait until write() wouldn't block anymore	431	EV::WRITE wait until write() wouldn't block anymore
…		…
223		447
224	=item $old_eventmask = $w->events ($new_eventmask)	448	=item $old_eventmask = $w->events ($new_eventmask)
225		449
226	Returns the previously set event mask and optionally set a new one.	450	Returns the previously set event mask and optionally set a new one.
227		451
		452	=back
		453
		454
		455	=head3 TIMER WATCHERS - relative and optionally repeating timeouts
		456
		457	=over 4
228		458
229	=item $w = EV::timer $after, $repeat, $callback	459	=item $w = EV::timer $after, $repeat, $callback
230		460
231	=item $w = EV::timer_ns $after, $repeat, $callback	461	=item $w = EV::timer_ns $after, $repeat, $callback
232		462
233	Calls the callback after C<$after> seconds. If C<$repeat> is non-zero,	463	=item $w = $loop->timer ($after, $repeat, $callback)
234	the timer will be restarted (with the $repeat value as $after) after the	464
235	callback returns.	465	=item $w = $loop->timer_ns ($after, $repeat, $callback)
		466
		467	Calls the callback after C<$after> seconds (which may be fractional). If
		468	C<$repeat> is non-zero, the timer will be restarted (with the $repeat
		469	value as $after) after the callback returns.
236		470
237	This means that the callback would be called roughly after C<$after>	471	This means that the callback would be called roughly after C<$after>
238	seconds, and then every C<$repeat> seconds. "Roughly" because the time of	472	seconds, and then every C<$repeat> seconds. The timer does his best not
239	callback processing is not taken into account, so the timer will slowly	473	to drift, but it will not invoke the timer more often then once per event
240	drift. If that isn't acceptable, look at EV::periodic.	474	loop iteration, and might drift in other cases. If that isn't acceptable,
		475	look at EV::periodic, which can provide long-term stable timers.
241		476
242	The timer is based on a monotonic clock, that is if somebody is sitting	477	The timer is based on a monotonic clock, that is, if somebody is sitting
243	in front of the machine while the timer is running and changes the system	478	in front of the machine while the timer is running and changes the system
244	clock, the timer will nevertheless run (roughly) the same time.	479	clock, the timer will nevertheless run (roughly) the same time.
245		480
246	The C<timer_ns> variant doesn't start (activate) the newly created watcher.	481	The C<timer_ns> variant doesn't start (activate) the newly created watcher.
247		482
248	=item $w->set ($after, $repeat)	483	=item $w->set ($after, $repeat)
249		484
250	Reconfigures the watcher, see the constructor above for details. Can be at	485	Reconfigures the watcher, see the constructor above for details. Can be called at
251	any time.	486	any time.
252		487
253	=item $w->again	488	=item $w->again
254		489
255	Similar to the C<start> method, but has special semantics for repeating timers:	490	Similar to the C<start> method, but has special semantics for repeating timers:
		491
		492	If the timer is active and non-repeating, it will be stopped.
256		493
257	If the timer is active and repeating, reset the timeout to occur	494	If the timer is active and repeating, reset the timeout to occur
258	C<$repeat> seconds after now.	495	C<$repeat> seconds after now.
259		496
260	If the timer is active and non-repeating, it will be stopped.
261
262	If the timer is in active and repeating, start it.	497	If the timer is inactive and repeating, start it using the repeat value.
263		498
264	Otherwise do nothing.	499	Otherwise do nothing.
265		500
266	This behaviour is useful when you have a timeout for some IO	501	This behaviour is useful when you have a timeout for some IO
267	operation. You create a timer object with the same value for C<$after> and	502	operation. You create a timer object with the same value for C<$after> and
268	C<$repeat>, and then, in the read/write watcher, run the C<again> method	503	C<$repeat>, and then, in the read/write watcher, run the C<again> method
269	on the timeout.	504	on the timeout.
270		505
		506	=back
271		507
		508
		509	=head3 PERIODIC WATCHERS - to cron or not to cron?
		510
		511	=over 4
		512
272	=item $w = EV::periodic $at, $interval, $callback	513	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback
273		514
274	=item $w = EV::periodic_ns $at, $interval, $callback	515	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback
275		516
276	Similar to EV::timer, but the time is given as an absolute point in time	517	=item $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback)
277	(C<$at>), plus an optional C<$interval>.
278		518
279	If the C<$interval> is zero, then the callback will be called at the time	519	=item $w = $loop->periodic_ns ($at, $interval, $reschedule_cb, $callback)
280	C<$at> if that is in the future, or as soon as possible if it is in the
281	past. It will not automatically repeat.
282		520
283	If the C<$interval> is nonzero, then the watcher will always be scheduled	521	Similar to EV::timer, but is not based on relative timeouts but on
284	to time out at the next C<$at + N * $interval> time.	522	absolute times. Apart from creating "simple" timers that trigger "at" the
		523	specified time, it can also be used for non-drifting absolute timers and
		524	more complex, cron-like, setups that are not adversely affected by time
		525	jumps (i.e. when the system clock is changed by explicit date -s or other
		526	means such as ntpd). It is also the most complex watcher type in EV.
285		527
286	This can be used to schedule a callback to run at very regular intervals,	528	It has three distinct "modes":
287	as long as the processing time is less then the interval (otherwise	529
288	obviously events will be skipped).	530	=over 4
		531
		532	=item * absolute timer ($interval = $reschedule_cb = 0)
		533
		534	This time simply fires at the wallclock time C<$at> and doesn't repeat. It
		535	will not adjust when a time jump occurs, that is, if it is to be run
		536	at January 1st 2011 then it will run when the system time reaches or
		537	surpasses this time.
		538
		539	=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
		540
		541	In this mode the watcher will always be scheduled to time out at the
		542	next C<$at + N * $interval> time (for some integer N) and then repeat,
		543	regardless of any time jumps.
		544
		545	This can be used to create timers that do not drift with respect to system
		546	time:
		547
		548	my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" };
		549
		550	That doesn't mean there will always be 3600 seconds in between triggers,
		551	but only that the the clalback will be called when the system time shows a
		552	full hour (UTC).
289		553
290	Another way to think about it (for the mathematically inclined) is that	554	Another way to think about it (for the mathematically inclined) is that
291	EV::periodic will try to run the callback at the next possible time where	555	EV::periodic will try to run the callback in this mode at the next
292	C<$time = $at (mod $interval)>, regardless of any time jumps.	556	possible time where C<$time = $at (mod $interval)>, regardless of any time
		557	jumps.
293		558
294	This periodic timer is based on "wallclock time", that is, if the clock	559	=item * manual reschedule mode ($reschedule_cb = coderef)
295	changes (C<ntp>, C<date -s> etc.), then the timer will nevertheless run at	560
296	the specified time.	561	In this mode $interval and $at are both being ignored. Instead, each
		562	time the periodic watcher gets scheduled, the reschedule callback
		563	($reschedule_cb) will be called with the watcher as first, and the current
		564	time as second argument.
		565
		566	I<This callback MUST NOT stop or destroy this or any other periodic
		567	watcher, ever>. If you need to stop it, return 1e30 and stop it
		568	afterwards.
		569
		570	It must return the next time to trigger, based on the passed time value
		571	(that is, the lowest time value larger than to the second argument). It
		572	will usually be called just before the callback will be triggered, but
		573	might be called at other times, too.
		574
		575	This can be used to create very complex timers, such as a timer that
		576	triggers on each midnight, local time (actually 24 hours after the last
		577	midnight, to keep the example simple. If you know a way to do it correctly
		578	in about the same space (without requiring elaborate modules), drop me a
		579	note :):
		580
		581	my $daily = EV::periodic 0, 0, sub {
		582	my ($w, $now) = @_;
		583
		584	use Time::Local ();
		585	my (undef, undef, undef, $d, $m, $y) = localtime $now;
		586	86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y
		587	}, sub {
		588	print "it's midnight or likely shortly after, now\n";
		589	};
		590
		591	=back
297		592
298	The C<periodic_ns> variant doesn't start (activate) the newly created watcher.	593	The C<periodic_ns> variant doesn't start (activate) the newly created watcher.
299		594
300	=item $w->set ($at, $interval)	595	=item $w->set ($at, $interval, $reschedule_cb)
301		596
302	Reconfigures the watcher, see the constructor above for details. Can be at	597	Reconfigures the watcher, see the constructor above for details. Can be called at
303	any time.	598	any time.
304		599
		600	=item $w->again
		601
		602	Simply stops and starts the watcher again.
		603
		604	=item $time = $w->at
		605
		606	Return the time that the watcher is expected to trigger next.
		607
		608	=back
		609
		610
		611	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!
		612
		613	=over 4
305		614
306	=item $w = EV::signal $signal, $callback	615	=item $w = EV::signal $signal, $callback
307		616
308	=item $w = EV::signal_ns $signal, $callback	617	=item $w = EV::signal_ns $signal, $callback
309		618
310	Call the callback when $signal is received (the signal can be specified	619	Call the callback when $signal is received (the signal can be specified by
311	by number or by name, just as with kill or %SIG).	620	number or by name, just as with C<kill> or C<%SIG>).
312		621
313	EV will grab the signal for the process (the kernel only allows one	622	EV will grab the signal for the process (the kernel only allows one
314	component to receive a signal at a time) when you start a signal watcher,	623	component to receive a signal at a time) when you start a signal watcher,
315	and removes it again when you stop it. Perl does the same when you	624	and removes it again when you stop it. Perl does the same when you
316	add/remove callbacks to %SIG, so watch out.	625	add/remove callbacks to C<%SIG>, so watch out.
317		626
318	You can have as many signal watchers per signal as you want.	627	You can have as many signal watchers per signal as you want.
319		628
320	The C<signal_ns> variant doesn't start (activate) the newly created watcher.	629	The C<signal_ns> variant doesn't start (activate) the newly created watcher.
321		630
322	=item $w->set ($signal)	631	=item $w->set ($signal)
323		632
324	Reconfigures the watcher, see the constructor above for details. Can be at	633	Reconfigures the watcher, see the constructor above for details. Can be
		634	called at any time.
		635
		636	=item $current_signum = $w->signal
		637
		638	=item $old_signum = $w->signal ($new_signal)
		639
		640	Returns the previously set signal (always as a number not name) and
		641	optionally set a new one.
		642
		643	=back
		644
		645
		646	=head3 CHILD WATCHERS - watch out for process status changes
		647
		648	=over 4
		649
		650	=item $w = EV::child $pid, $trace, $callback
		651
		652	=item $w = EV::child_ns $pid, $trace, $callback
		653
		654	=item $w = $loop->child ($pid, $trace, $callback)
		655
		656	=item $w = $loop->child_ns ($pid, $trace, $callback)
		657
		658	Call the callback when a status change for pid C<$pid> (or any pid
		659	if C<$pid> is 0) has been received (a status change happens when the
		660	process terminates or is killed, or, when trace is true, additionally when
		661	it is stopped or continued). More precisely: when the process receives
		662	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all
		663	changed/zombie children and call the callback.
		664
		665	It is valid (and fully supported) to install a child watcher after a child
		666	has exited but before the event loop has started its next iteration (for
		667	example, first you C<fork>, then the new child process might exit, and
		668	only then do you install a child watcher in the parent for the new pid).
		669
		670	You can access both exit (or tracing) status and pid by using the
		671	C<rstatus> and C<rpid> methods on the watcher object.
		672
		673	You can have as many pid watchers per pid as you want, they will all be
		674	called.
		675
		676	The C<child_ns> variant doesn't start (activate) the newly created watcher.
		677
		678	=item $w->set ($pid, $trace)
		679
		680	Reconfigures the watcher, see the constructor above for details. Can be called at
325	any time.	681	any time.
326		682
		683	=item $current_pid = $w->pid
327		684
328	=item $w = EV::child $pid, $callback	685	Returns the previously set process id and optionally set a new one.
329		686
330	=item $w = EV::child_ns $pid, $callback	687	=item $exit_status = $w->rstatus
331		688
332	Call the callback when a status change for pid C<$pid> (or any pid	689	Return the exit/wait status (as returned by waitpid, see the waitpid entry
333	if C<$pid> is 0) has been received. More precisely: when the process	690	in perlfunc).
334	receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all
335	changed/zombie children and call the callback.
336		691
337	Unlike all other callbacks, this callback will be called with an	692	=item $pid = $w->rpid
338	additional third argument which is the exit status. See the C<waitpid>
339	function for details.
340		693
341	You can have as many pid watchers per pid as you want.	694	Return the pid of the awaited child (useful when you have installed a
		695	watcher for all pids).
342		696
		697	=back
		698
		699
		700	=head3 STAT WATCHERS - did the file attributes just change?
		701
		702	=over 4
		703
		704	=item $w = EV::stat $path, $interval, $callback
		705
		706	=item $w = EV::stat_ns $path, $interval, $callback
		707
		708	=item $w = $loop->stat ($path, $interval, $callback)
		709
		710	=item $w = $loop->stat_ns ($path, $interval, $callback)
		711
		712	Call the callback when a file status change has been detected on
		713	C<$path>. The C<$path> does not need to exist, changing from "path exists"
		714	to "path does not exist" is a status change like any other.
		715
		716	The C<$interval> is a recommended polling interval for systems where
		717	OS-supported change notifications don't exist or are not supported. If
		718	you use C<0> then an unspecified default is used (which is highly
		719	recommended!), which is to be expected to be around five seconds usually.
		720
		721	This watcher type is not meant for massive numbers of stat watchers,
		722	as even with OS-supported change notifications, this can be
		723	resource-intensive.
		724
343	The C<child_ns> variant doesn't start (activate) the newly created watcher.	725	The C<stat_ns> variant doesn't start (activate) the newly created watcher.
344		726
345	=item $w->set ($pid)	727	=item ... = $w->stat
346		728
		729	This call is very similar to the perl C<stat> built-in: It stats (using
		730	C<lstat>) the path specified in the watcher and sets perls stat cache (as
		731	well as EV's idea of the current stat values) to the values found.
		732
		733	In scalar context, a boolean is return indicating success or failure of
		734	the stat. In list context, the same 13-value list as with stat is returned
		735	(except that the blksize and blocks fields are not reliable).
		736
		737	In the case of an error, errno is set to C<ENOENT> (regardless of the
		738	actual error value) and the C<nlink> value is forced to zero (if the stat
		739	was successful then nlink is guaranteed to be non-zero).
		740
		741	See also the next two entries for more info.
		742
		743	=item ... = $w->attr
		744
		745	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		746	the values most recently detected by EV. See the next entry for more info.
		747
		748	=item ... = $w->prev
		749
		750	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		751	the previous set of values, before the change.
		752
		753	That is, when the watcher callback is invoked, C<< $w->prev >> will be set
		754	to the values found I<before> a change was detected, while C<< $w->attr >>
		755	returns the values found leading to the change detection. The difference (if any)
		756	between C<prev> and C<attr> is what triggered the callback.
		757
		758	If you did something to the filesystem object and do not want to trigger
		759	yet another change, you can call C<stat> to update EV's idea of what the
		760	current attributes are.
		761
		762	=item $w->set ($path, $interval)
		763
347	Reconfigures the watcher, see the constructor above for details. Can be at	764	Reconfigures the watcher, see the constructor above for details. Can be
348	any time.	765	called at any time.
349		766
		767	=item $current_path = $w->path
		768
		769	=item $old_path = $w->path ($new_path)
		770
		771	Returns the previously set path and optionally set a new one.
		772
		773	=item $current_interval = $w->interval
		774
		775	=item $old_interval = $w->interval ($new_interval)
		776
		777	Returns the previously set interval and optionally set a new one. Can be
		778	used to query the actual interval used.
		779
		780	=back
		781
		782
		783	=head3 IDLE WATCHERS - when you've got nothing better to do...
		784
		785	=over 4
350		786
351	=item $w = EV::idle $callback	787	=item $w = EV::idle $callback
352		788
353	=item $w = EV::idle_ns $callback	789	=item $w = EV::idle_ns $callback
354		790
355	Call the callback when there are no pending io, timer/periodic, signal or	791	=item $w = $loop->idle ($callback)
356	child events, i.e. when the process is idle.	792
		793	=item $w = $loop->idle_ns ($callback)
		794
		795	Call the callback when there are no other pending watchers of the same or
		796	higher priority (excluding check, prepare and other idle watchers of the
		797	same or lower priority, of course). They are called idle watchers because
		798	when the watcher is the highest priority pending event in the process, the
		799	process is considered to be idle at that priority.
		800
		801	If you want a watcher that is only ever called when I<no> other events are
		802	outstanding you have to set the priority to C<EV::MINPRI>.
357		803
358	The process will not block as long as any idle watchers are active, and	804	The process will not block as long as any idle watchers are active, and
359	they will be called repeatedly until stopped.	805	they will be called repeatedly until stopped.
360		806
		807	For example, if you have idle watchers at priority C<0> and C<1>, and
		808	an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
		809	and the I/O watcher will always run when ready. Only when the idle watcher
		810	at priority C<1> is stopped and the I/O watcher at priority C<0> is not
		811	pending with the C<0>-priority idle watcher be invoked.
		812
361	The C<idle_ns> variant doesn't start (activate) the newly created watcher.	813	The C<idle_ns> variant doesn't start (activate) the newly created watcher.
362		814
		815	=back
		816
		817
		818	=head3 PREPARE WATCHERS - customise your event loop!
		819
		820	=over 4
363		821
364	=item $w = EV::prepare $callback	822	=item $w = EV::prepare $callback
365		823
366	=item $w = EV::prepare_ns $callback	824	=item $w = EV::prepare_ns $callback
		825
		826	=item $w = $loop->prepare ($callback)
		827
		828	=item $w = $loop->prepare_ns ($callback)
367		829
368	Call the callback just before the process would block. You can still	830	Call the callback just before the process would block. You can still
369	create/modify any watchers at this point.	831	create/modify any watchers at this point.
370		832
371	See the EV::check watcher, below, for explanations and an example.	833	See the EV::check watcher, below, for explanations and an example.
372		834
373	The C<prepare_ns> variant doesn't start (activate) the newly created watcher.	835	The C<prepare_ns> variant doesn't start (activate) the newly created watcher.
374		836
		837	=back
		838
		839
		840	=head3 CHECK WATCHERS - customise your event loop even more!
		841
		842	=over 4
375		843
376	=item $w = EV::check $callback	844	=item $w = EV::check $callback
377		845
378	=item $w = EV::check_ns $callback	846	=item $w = EV::check_ns $callback
		847
		848	=item $w = $loop->check ($callback)
		849
		850	=item $w = $loop->check_ns ($callback)
379		851
380	Call the callback just after the process wakes up again (after it has	852	Call the callback just after the process wakes up again (after it has
381	gathered events), but before any other callbacks have been invoked.	853	gathered events), but before any other callbacks have been invoked.
382		854
383	This is used to integrate other event-based software into the EV	855	This is used to integrate other event-based software into the EV
…		…
391	# do nothing unless active	863	# do nothing unless active
392	$dispatcher->{_event_queue_h}	864	$dispatcher->{_event_queue_h}
393	or return;	865	or return;
394		866
395	# make the dispatcher handle any outstanding stuff	867	# make the dispatcher handle any outstanding stuff
		868	... not shown
396		869
397	# create an IO watcher for each and every socket	870	# create an I/O watcher for each and every socket
398	@snmp_watcher = (	871	@snmp_watcher = (
399	(map { EV::io $_, EV::READ, sub { } }	872	(map { EV::io $_, EV::READ, sub { } }
400	keys %{ $dispatcher->{_descriptors} }),	873	keys %{ $dispatcher->{_descriptors} }),
		874
		875	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
		876	? $event->[Net::SNMP::Dispatcher::_TIME] - EV::now : 0),
		877	0, sub { },
401	);	878	);
402
403	# if there are any timeouts, also create a timer
404	push @snmp_watcher, EV::timer $event->[Net::SNMP::Dispatcher::_TIME] - EV::now, 0, sub { }
405	if $event->[Net::SNMP::Dispatcher::_ACTIVE];
406	};	879	};
407		880
408	The callbacks are irrelevant, the only purpose of those watchers is	881	The callbacks are irrelevant (and are not even being called), the
409	to wake up the process as soon as one of those events occurs (socket	882	only purpose of those watchers is to wake up the process as soon as
410	readable, or timer timed out). The corresponding EV::check watcher will then	883	one of those events occurs (socket readable, or timer timed out). The
411	clean up:	884	corresponding EV::check watcher will then clean up:
412		885
413	our $snmp_check = EV::check sub {	886	our $snmp_check = EV::check sub {
414	# destroy all watchers	887	# destroy all watchers
415	@snmp_watcher = ();	888	@snmp_watcher = ();
416		889
417	# make the dispatcher handle any new stuff	890	# make the dispatcher handle any new stuff
		891	... not shown
418	};	892	};
419		893
420	The callbacks of the created watchers will not be called as the watchers	894	The callbacks of the created watchers will not be called as the watchers
421	are destroyed before this cna happen (remember EV::check gets called	895	are destroyed before this cna happen (remember EV::check gets called
422	first).	896	first).
423		897
424	The C<check_ns> variant doesn't start (activate) the newly created watcher.	898	The C<check_ns> variant doesn't start (activate) the newly created watcher.
425		899
426	=back	900	=back
427		901
		902
		903	=head3 FORK WATCHERS - the audacity to resume the event loop after a fork
		904
		905	Fork watchers are called when a C<fork ()> was detected. The invocation
		906	is done before the event loop blocks next and before C<check> watchers
		907	are being called, and only in the child after the fork.
		908
		909	=over 4
		910
		911	=item $w = EV::fork $callback
		912
		913	=item $w = EV::fork_ns $callback
		914
		915	=item $w = $loop->fork ($callback)
		916
		917	=item $w = $loop->fork_ns ($callback)
		918
		919	Call the callback before the event loop is resumed in the child process
		920	after a fork.
		921
		922	The C<fork_ns> variant doesn't start (activate) the newly created watcher.
		923
		924	=back
		925
		926
		927	=head3 EMBED WATCHERS - when one backend isn't enough...
		928
		929	This is a rather advanced watcher type that lets you embed one event loop
		930	into another (currently only IO events are supported in the embedded
		931	loop, other types of watchers might be handled in a delayed or incorrect
		932	fashion and must not be used).
		933
		934	See the libev documentation at
		935	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
		936	for more details.
		937
		938	In short, this watcher is most useful on BSD systems without working
		939	kqueue to still be able to handle a large number of sockets:
		940
		941	my $socket_loop;
		942
		943	# check wether we use SELECT or POLL _and_ KQUEUE is supported
		944	if (
		945	(EV::backend & (EV::BACKEND_POLL \| EV::BACKEND_SELECT))
		946	&& (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
		947	) {
		948	# use kqueue for sockets
		949	$socket_loop = new EV::Loop EV::BACKEND_KQUEUE \| EV::FLAG_NOENV;
		950	}
		951
		952	# use the default loop otherwise
		953	$socket_loop \|\|= EV::default_loop;
		954
		955	=over 4
		956
		957	=item $w = EV::embed $otherloop, $callback
		958
		959	=item $w = EV::embed_ns $otherloop, $callback
		960
		961	=item $w = $loop->embed ($otherloop, $callback)
		962
		963	=item $w = $loop->embed_ns ($otherloop, $callback)
		964
		965	Call the callback when the embedded event loop (C<$otherloop>) has any
		966	I/O activity. The C<$callback> should alwas be specified as C<undef> in
		967	this version of EV, which means the embedded event loop will be managed
		968	automatically.
		969
		970	The C<embed_ns> variant doesn't start (activate) the newly created watcher.
		971
		972	=back
		973
		974	=head3 ASYNC WATCHERS - how to wake up another event loop
		975
		976	Async watchers are provided by EV, but have little use in perl directly, as perl
		977	neither supports threads nor direct access to signal handlers or other
		978	contexts where they could be of value.
		979
		980	It is, however, possible to use them from the XS level.
		981
		982	Please see the libev documentation for further details.
		983
		984	=over 4
		985
		986	=item $w = EV::async $callback
		987
		988	=item $w = EV::async_ns $callback
		989
		990	=item $w->send
		991
		992	=item $bool = $w->async_pending
		993
		994	=back
		995
		996
		997	=head1 PERL SIGNALS
		998
		999	While Perl signal handling (C<%SIG>) is not affected by EV, the behaviour
		1000	with EV is as the same as any other C library: Perl-signals will only be
		1001	handled when Perl runs, which means your signal handler might be invoked
		1002	only the next time an event callback is invoked.
		1003
		1004	The solution is to use EV signal watchers (see C<EV::signal>), which will
		1005	ensure proper operations with regards to other event watchers.
		1006
		1007	If you cannot do this for whatever reason, you can also force a watcher
		1008	to be called on every event loop iteration by installing a C<EV::check>
		1009	watcher:
		1010
		1011	my $async_check = EV::check sub { };
		1012
		1013	This ensures that perl gets into control for a short time to handle any
		1014	pending signals, and also ensures (slightly) slower overall operation.
		1015
428	=head1 THREADS	1016	=head1 THREADS
429		1017
430	Threads are not supported by this in any way. Perl pseudo-threads is evil	1018	Threads are not supported by this module in any way. Perl pseudo-threads
431	stuff and must die.	1019	is evil stuff and must die. As soon as Perl gains real threads I will work
		1020	on thread support for it.
		1021
		1022	=head1 FORK
		1023
		1024	Most of the "improved" event delivering mechanisms of modern operating
		1025	systems have quite a few problems with fork(2) (to put it bluntly: it is
		1026	not supported and usually destructive). Libev makes it possible to work
		1027	around this by having a function that recreates the kernel state after
		1028	fork in the child.
		1029
		1030	On non-win32 platforms, this module requires the pthread_atfork
		1031	functionality to do this automatically for you. This function is quite
		1032	buggy on most BSDs, though, so YMMV. The overhead for this is quite
		1033	negligible, because everything the function currently does is set a flag
		1034	that is checked only when the event loop gets used the next time, so when
		1035	you do fork but not use EV, the overhead is minimal.
		1036
		1037	On win32, there is no notion of fork so all this doesn't apply, of course.
432		1038
433	=cut	1039	=cut
434		1040
435	our $DIED = sub {	1041	our $DIED = sub {
436	warn "EV: error in callback (ignoring): $@";	1042	warn "EV: error in callback (ignoring): $@";
437	};	1043	};
438		1044
439	init;	1045	default_loop
440		1046	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?';
441	push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"];
442		1047
443	1;	1048	1;
444		1049
445	=head1 SEE ALSO	1050	=head1 SEE ALSO
446		1051
447	L<EV::DNS>, L<EV::AnyEvent>.	1052	L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as
		1053	event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient
		1054	coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP).
448		1055
449	=head1 AUTHOR	1056	=head1 AUTHOR
450		1057
451	Marc Lehmann <schmorp@schmorp.de>	1058	Marc Lehmann <schmorp@schmorp.de>
452	http://home.schmorp.de/	1059	http://home.schmorp.de/

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Comparing EV/EV.pm (file contents): Revision 1.20 by root, Thu Nov 1 17:17:32 2007 UTC vs. Revision 1.87 by root, Tue Apr 15 04:41:57 2008 UTC

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Comparing EV/EV.pm (file contents):
Revision 1.20 by root, Thu Nov 1 17:17:32 2007 UTC vs.
Revision 1.87 by root, Tue Apr 15 04:41:57 2008 UTC