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

Comparing EV/EV.pm (file contents):
Revision 1.34 by root, Fri Nov 9 19:38:56 2007 UTC vs.
Revision 1.97 by root, Mon May 26 05:37:18 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, 0, sub {	21	my $w = EV::periodic 0, 60, 0, sub {
…		…
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, $revents) = @_;	47	my ($w, $revents) = @_;
46	# my $pid = $w->rpid;	48	warn $w->path, " has changed somehow.\n";
47	my $status = $w->rstatus;
48	};	49	};
49		50
50	# MAINLOOP	51	# MAINLOOP
51	EV::loop; # loop until EV::loop_done is called	52	EV::loop; # loop until EV::unloop is called or all watchers stop
52	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
53	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
54		55
55	=head1 DESCRIPTION	56	=head1 DESCRIPTION
56		57
57	This module provides an interface to libev	58	This module provides an interface to libev
58	(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://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.
		65
		66	This module is very fast and scalable. It is actually so fast that you
		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.
59		71
60	=cut	72	=cut
61		73
62	package EV;	74	package EV;
63		75
64	use strict;	76	use strict;
65		77
66	BEGIN {	78	BEGIN {
67	our $VERSION = '0.7';	79	our $VERSION = '3.42';
68	use XSLoader;	80	use XSLoader;
69	XSLoader::load "EV", $VERSION;	81	XSLoader::load "EV", $VERSION;
70	}	82	}
71		83
72	@EV::Io::ISA =	84	@EV::IO::ISA =
73	@EV::Timer::ISA =	85	@EV::Timer::ISA =
74	@EV::Periodic::ISA =	86	@EV::Periodic::ISA =
75	@EV::Signal::ISA =	87	@EV::Signal::ISA =
		88	@EV::Child::ISA =
		89	@EV::Stat::ISA =
76	@EV::Idle::ISA =	90	@EV::Idle::ISA =
77	@EV::Prepare::ISA =	91	@EV::Prepare::ISA =
78	@EV::Check::ISA =	92	@EV::Check::ISA =
79	@EV::Child::ISA = "EV::Watcher";	93	@EV::Embed::ISA =
		94	@EV::Fork::ISA =
		95	@EV::Async::ISA =
		96	"EV::Watcher";
		97
		98	@EV::Loop::Default::ISA = "EV::Loop";
		99
		100	=head1 EVENT LOOPS
		101
		102	EV supports multiple event loops: There is a single "default event loop"
		103	that can handle everything including signals and child watchers, and any
		104	number of "dynamic event loops" that can use different backends (with
		105	various limitations), but no child and signal watchers.
		106
		107	You do not have to do anything to create the default event loop: When
		108	the module is loaded a suitable backend is selected on the premise of
		109	selecting a working backend (which for example rules out kqueue on most
		110	BSDs). Modules should, unless they have "special needs" always use the
		111	default loop as this is fastest (perl-wise), best supported by other
		112	modules (e.g. AnyEvent or Coro) and most portable event loop.
		113
		114	For specific programs you can create additional event loops dynamically.
		115
		116	=over 4
		117
		118	=item $loop = new EV::loop [$flags]
		119
		120	Create a new event loop as per the specified flags. Please refer to the
		121	C<ev_loop_new ()> function description in the libev documentation
		122	(L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>)
		123	for more info.
		124
		125	The loop will automatically be destroyed when it is no longer referenced
		126	by any watcher and the loop object goes out of scope.
		127
		128	Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop
		129	is protected by this module.
		130
		131	=item $loop->loop_fork
		132
		133	Must be called after a fork in the child, before entering or continuing
		134	the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls
		135	this function automatically, at some performance loss (refer to the libev
		136	documentation).
		137
		138	=item $loop->loop_verify
		139
		140	Calls C<ev_verify> to make internal consistency checks (for debugging
		141	libev) and abort the program if any data structures wree found to be
		142	corrupted.
		143
		144	=item $loop = EV::default_loop [$flags]
		145
		146	Return the default loop (which is a singleton object). Since this module
		147	already creates the default loop with default flags, specifying flags here
		148	will not have any effect unless you destroy the default loop.
		149
		150	=back
		151
80		152
81	=head1 BASIC INTERFACE	153	=head1 BASIC INTERFACE
82		154
83	=over 4	155	=over 4
84		156
85	=item $EV::DIED	157	=item $EV::DIED
86		158
87	Must contain a reference to a function that is called when a callback	159	Must contain a reference to a function that is called when a callback
88	throws an exception (with $@ containing thr error). The default prints an	160	throws an exception (with $@ containing the error). The default prints an
89	informative message and continues.	161	informative message and continues.
90		162
91	If this callback throws an exception it will be silently ignored.	163	If this callback throws an exception it will be silently ignored.
92		164
		165	=item $flags = EV::supported_backends
		166
		167	=item $flags = EV::recommended_backends
		168
		169	=item $flags = EV::embeddable_backends
		170
		171	Returns the set (see C<EV::BACKEND_*> flags) of backends supported by this
		172	instance of EV, the set of recommended backends (supposed to be good) for
		173	this platform and the set of embeddable backends (see EMBED WATCHERS).
		174
		175	=item EV::sleep $seconds
		176
		177	Block the process for the given number of (fractional) seconds.
		178
93	=item $time = EV::time	179	=item $time = EV::time
94		180
95	Returns the current time in (fractional) seconds since the epoch.	181	Returns the current time in (fractional) seconds since the epoch.
96		182
97	=item $time = EV::now	183	=item $time = EV::now
		184
		185	=item $time = $loop->now
98		186
99	Returns the time the last event loop iteration has been started. This	187	Returns the time the last event loop iteration has been started. This
100	is the time that (relative) timers are based on, and refering to it is	188	is the time that (relative) timers are based on, and refering to it is
101	usually faster then calling EV::time.	189	usually faster then calling EV::time.
102		190
103	=item $method = EV::ev_method	191	=item $backend = EV::backend
		192
		193	=item $backend = $loop->backend
104		194
105	Returns an integer describing the backend used by libev (EV::METHOD_SELECT	195	Returns an integer describing the backend used by libev (EV::METHOD_SELECT
106	or EV::METHOD_EPOLL).	196	or EV::METHOD_EPOLL).
107		197
108	=item EV::loop [$flags]	198	=item EV::loop [$flags]
109		199
		200	=item $loop->loop ([$flags])
		201
110	Begin checking for events and calling callbacks. It returns when a	202	Begin checking for events and calling callbacks. It returns when a
111	callback calls EV::loop_done.	203	callback calls EV::unloop.
112		204
113	The $flags argument can be one of the following:	205	The $flags argument can be one of the following:
114		206
115	0 as above	207	0 as above
116	EV::LOOP_ONESHOT block at most once (wait, but do not loop)	208	EV::LOOP_ONESHOT block at most once (wait, but do not loop)
117	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)	209	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
118		210
119	=item EV::loop_done [$how]	211	=item EV::unloop [$how]
120		212
		213	=item $loop->unloop ([$how])
		214
121	When called with no arguments or an argument of 1, makes the innermost	215	When called with no arguments or an argument of EV::UNLOOP_ONE, makes the
122	call to EV::loop return.	216	innermost call to EV::loop return.
123		217
124	When called with an agrument of 2, all calls to EV::loop will return as	218	When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as
125	fast as possible.	219	fast as possible.
126		220
127	=back	221	=item $count = EV::loop_count
128		222
129	=head2 WATCHER	223	=item $count = $loop->loop_count
		224
		225	Return the number of times the event loop has polled for new
		226	events. Sometiems useful as a generation counter.
		227
		228	=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
		229
		230	=item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents))
		231
		232	This function rolls together an I/O and a timer watcher for a single
		233	one-shot event without the need for managing a watcher object.
		234
		235	If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events>
		236	must be a bitset containing either C<EV::READ>, C<EV::WRITE> or C<EV::READ
		237	\| EV::WRITE>, indicating the type of I/O event you want to wait for. If
		238	you do not want to wait for some I/O event, specify C<undef> for
		239	C<$fh_or_undef> and C<0> for C<$events>).
		240
		241	If timeout is C<undef> or negative, then there will be no
		242	timeout. Otherwise a EV::timer with this value will be started.
		243
		244	When an error occurs or either the timeout or I/O watcher triggers, then
		245	the callback will be called with the received event set (in general
		246	you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
		247	C<EV::WRITE> and C<EV::TIMEOUT>).
		248
		249	EV::once doesn't return anything: the watchers stay active till either
		250	of them triggers, then they will be stopped and freed, and the callback
		251	invoked.
		252
		253	=item EV::feed_fd_event ($fd, $revents)
		254
		255	=item $loop->feed_fd_event ($fd, $revents)
		256
		257	Feed an event on a file descriptor into EV. EV will react to this call as
		258	if the readyness notifications specified by C<$revents> (a combination of
		259	C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>.
		260
		261	=item EV::feed_signal_event ($signal)
		262
		263	Feed a signal event into EV. EV will react to this call as if the signal
		264	specified by C<$signal> had occured.
		265
		266	=item EV::set_io_collect_interval $time
		267
		268	=item $loop->set_io_collect_interval ($time)
		269
		270	=item EV::set_timeout_collect_interval $time
		271
		272	=item $loop->set_timeout_collect_interval ($time)
		273
		274	These advanced functions set the minimum block interval when polling for I/O events and the minimum
		275	wait interval for timer events. See the libev documentation at
		276	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for
		277	a more detailed discussion.
		278
		279	=back
		280
		281
		282	=head1 WATCHER OBJECTS
130		283
131	A watcher is an object that gets created to record your interest in some	284	A watcher is an object that gets created to record your interest in some
132	event. For instance, if you want to wait for STDIN to become readable, you	285	event. For instance, if you want to wait for STDIN to become readable, you
133	would create an EV::io watcher for that:	286	would create an EV::io watcher for that:
134		287
135	my $watcher = EV::io *STDIN, EV::READ, sub {	288	my $watcher = EV::io *STDIN, EV::READ, sub {
136	my ($watcher, $revents) = @_;	289	my ($watcher, $revents) = @_;
137	warn "yeah, STDIN should not be readable without blocking!\n"	290	warn "yeah, STDIN should now be readable without blocking!\n"
138	};	291	};
139		292
140	All watchers can be active (waiting for events) or inactive (paused). Only	293	All watchers can be active (waiting for events) or inactive (paused). Only
141	active watchers will have their callbacks invoked. All callbacks will be	294	active watchers will have their callbacks invoked. All callbacks will be
142	called with at least two arguments: the watcher and a bitmask of received	295	called with at least two arguments: the watcher and a bitmask of received
143	events.	296	events.
144		297
145	Each watcher type has its associated bit in revents, so you can use the	298	Each watcher type has its associated bit in revents, so you can use the
146	same callback for multiple watchers. The event mask is named after the	299	same callback for multiple watchers. The event mask is named after the
147	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,	300	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
148	EV::periodic sets EV::PERIODIC and so on, with the exception of IO events	301	EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events
149	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which	302	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
150	uses EV::TIMEOUT).	303	uses EV::TIMEOUT).
151		304
152	In the rare case where one wants to create a watcher but not start it at	305	In the rare case where one wants to create a watcher but not start it at
153	the same time, each constructor has a variant with a trailing C<_ns> in	306	the same time, each constructor has a variant with a trailing C<_ns> in
…		…
159		312
160	Also, all methods changing some aspect of a watcher (->set, ->priority,	313	Also, all methods changing some aspect of a watcher (->set, ->priority,
161	->fh and so on) automatically stop and start it again if it is active,	314	->fh and so on) automatically stop and start it again if it is active,
162	which means pending events get lost.	315	which means pending events get lost.
163		316
164	=head2 WATCHER TYPES	317	=head2 COMMON WATCHER METHODS
165		318
166	Now lets move to the existing watcher types and asociated methods.	319	This section lists methods common to all watchers.
167
168	The following methods are available for all watchers. Then followes a
169	description of each watcher constructor (EV::io, EV::timer, EV::periodic,
170	EV::signal, EV::child, EV::idle, EV::prepare and EV::check), followed by
171	any type-specific methods (if any).
172		320
173	=over 4	321	=over 4
174		322
175	=item $w->start	323	=item $w->start
176		324
…		…
180		328
181	=item $w->stop	329	=item $w->stop
182		330
183	Stop a watcher if it is active. Also clear any pending events (events that	331	Stop a watcher if it is active. Also clear any pending events (events that
184	have been received but that didn't yet result in a callback invocation),	332	have been received but that didn't yet result in a callback invocation),
185	regardless of wether the watcher was active or not.	333	regardless of whether the watcher was active or not.
186		334
187	=item $bool = $w->is_active	335	=item $bool = $w->is_active
188		336
189	Returns true if the watcher is active, false otherwise.	337	Returns true if the watcher is active, false otherwise.
190		338
…		…
215	watchers with higher priority will be invoked first. The valid range of	363	watchers with higher priority will be invoked first. The valid range of
216	priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default	364	priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default
217	-2). If the priority is outside this range it will automatically be	365	-2). If the priority is outside this range it will automatically be
218	normalised to the nearest valid priority.	366	normalised to the nearest valid priority.
219		367
220	The default priority of any newly-created weatcher is 0.	368	The default priority of any newly-created watcher is 0.
221		369
		370	Note that the priority semantics have not yet been fleshed out and are
		371	subject to almost certain change.
		372
222	=item $w->trigger ($revents)	373	=item $w->invoke ($revents)
223		374
224	Call the callback now with the given event mask.	375	Call the callback now with the given event mask.
225		376
		377	=item $w->feed_event ($revents)
		378
		379	Feed some events on this watcher into EV. EV will react to this call as if
		380	the watcher had received the given C<$revents> mask.
		381
		382	=item $revents = $w->clear_pending
		383
		384	If the watcher is pending, this function clears its pending status and
		385	returns its C<$revents> bitset (as if its callback was invoked). If the
		386	watcher isn't pending it does nothing and returns C<0>.
		387
		388	=item $previous_state = $w->keepalive ($bool)
		389
		390	Normally, C<EV::loop> will return when there are no active watchers
		391	(which is a "deadlock" because no progress can be made anymore). This is
		392	convinient because it allows you to start your watchers (and your jobs),
		393	call C<EV::loop> once and when it returns you know that all your jobs are
		394	finished (or they forgot to register some watchers for their task :).
		395
		396	Sometimes, however, this gets in your way, for example when the module
		397	that calls C<EV::loop> (usually the main program) is not the same module
		398	as a long-living watcher (for example a DNS client module written by
		399	somebody else even). Then you might want any outstanding requests to be
		400	handled, but you would not want to keep C<EV::loop> from returning just
		401	because you happen to have this long-running UDP port watcher.
		402
		403	In this case you can clear the keepalive status, which means that even
		404	though your watcher is active, it won't keep C<EV::loop> from returning.
		405
		406	The initial value for keepalive is true (enabled), and you cna change it
		407	any time.
		408
		409	Example: Register an I/O watcher for some UDP socket but do not keep the
		410	event loop from running just because of that watcher.
		411
		412	my $udp_socket = ...
		413	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
		414	$1000udp_watcher->keepalive (0);
		415
		416	=item $loop = $w->loop
		417
		418	Return the loop that this watcher is attached to.
		419
		420	=back
		421
		422
		423	=head1 WATCHER TYPES
		424
		425	Each of the following subsections describes a single watcher type.
		426
		427	=head3 I/O WATCHERS - is this file descriptor readable or writable?
		428
		429	=over 4
226		430
227	=item $w = EV::io $fileno_or_fh, $eventmask, $callback	431	=item $w = EV::io $fileno_or_fh, $eventmask, $callback
228		432
229	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback	433	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
230		434
		435	=item $w = $loop->io ($fileno_or_fh, $eventmask, $callback)
		436
		437	=item $w = $loop->io_ns ($fileno_or_fh, $eventmask, $callback)
		438
231	As long as the returned watcher object is alive, call the C<$callback>	439	As long as the returned watcher object is alive, call the C<$callback>
232	when the events specified in C<$eventmask>.	440	when at least one of events specified in C<$eventmask> occurs.
233		441
234	The $eventmask can be one or more of these constants ORed together:	442	The $eventmask can be one or more of these constants ORed together:
235		443
236	EV::READ wait until read() wouldn't block anymore	444	EV::READ wait until read() wouldn't block anymore
237	EV::WRITE wait until write() wouldn't block anymore	445	EV::WRITE wait until write() wouldn't block anymore
…		…
253		461
254	=item $old_eventmask = $w->events ($new_eventmask)	462	=item $old_eventmask = $w->events ($new_eventmask)
255		463
256	Returns the previously set event mask and optionally set a new one.	464	Returns the previously set event mask and optionally set a new one.
257		465
		466	=back
		467
		468
		469	=head3 TIMER WATCHERS - relative and optionally repeating timeouts
		470
		471	=over 4
258		472
259	=item $w = EV::timer $after, $repeat, $callback	473	=item $w = EV::timer $after, $repeat, $callback
260		474
261	=item $w = EV::timer_ns $after, $repeat, $callback	475	=item $w = EV::timer_ns $after, $repeat, $callback
262		476
263	Calls the callback after C<$after> seconds. If C<$repeat> is non-zero,	477	=item $w = $loop->timer ($after, $repeat, $callback)
264	the timer will be restarted (with the $repeat value as $after) after the	478
265	callback returns.	479	=item $w = $loop->timer_ns ($after, $repeat, $callback)
		480
		481	Calls the callback after C<$after> seconds (which may be fractional). If
		482	C<$repeat> is non-zero, the timer will be restarted (with the $repeat
		483	value as $after) after the callback returns.
266		484
267	This means that the callback would be called roughly after C<$after>	485	This means that the callback would be called roughly after C<$after>
268	seconds, and then every C<$repeat> seconds. "Roughly" because the time of	486	seconds, and then every C<$repeat> seconds. The timer does his best not
269	callback processing is not taken into account, so the timer will slowly	487	to drift, but it will not invoke the timer more often then once per event
270	drift. If that isn't acceptable, look at EV::periodic.	488	loop iteration, and might drift in other cases. If that isn't acceptable,
		489	look at EV::periodic, which can provide long-term stable timers.
271		490
272	The timer is based on a monotonic clock, that is if somebody is sitting	491	The timer is based on a monotonic clock, that is, if somebody is sitting
273	in front of the machine while the timer is running and changes the system	492	in front of the machine while the timer is running and changes the system
274	clock, the timer will nevertheless run (roughly) the same time.	493	clock, the timer will nevertheless run (roughly) the same time.
275		494
276	The C<timer_ns> variant doesn't start (activate) the newly created watcher.	495	The C<timer_ns> variant doesn't start (activate) the newly created watcher.
277		496
278	=item $w->set ($after, $repeat)	497	=item $w->set ($after, $repeat)
279		498
280	Reconfigures the watcher, see the constructor above for details. Can be at	499	Reconfigures the watcher, see the constructor above for details. Can be called at
281	any time.	500	any time.
282		501
283	=item $w->again	502	=item $w->again
284		503
285	Similar to the C<start> method, but has special semantics for repeating timers:	504	Similar to the C<start> method, but has special semantics for repeating timers:
		505
		506	If the timer is active and non-repeating, it will be stopped.
286		507
287	If the timer is active and repeating, reset the timeout to occur	508	If the timer is active and repeating, reset the timeout to occur
288	C<$repeat> seconds after now.	509	C<$repeat> seconds after now.
289		510
290	If the timer is active and non-repeating, it will be stopped.
291
292	If the timer is in active and repeating, start it.	511	If the timer is inactive and repeating, start it using the repeat value.
293		512
294	Otherwise do nothing.	513	Otherwise do nothing.
295		514
296	This behaviour is useful when you have a timeout for some IO	515	This behaviour is useful when you have a timeout for some IO
297	operation. You create a timer object with the same value for C<$after> and	516	operation. You create a timer object with the same value for C<$after> and
298	C<$repeat>, and then, in the read/write watcher, run the C<again> method	517	C<$repeat>, and then, in the read/write watcher, run the C<again> method
299	on the timeout.	518	on the timeout.
300		519
		520	=back
		521
		522
		523	=head3 PERIODIC WATCHERS - to cron or not to cron?
		524
		525	=over 4
301		526
302	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback	527	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback
303		528
304	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback	529	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback
		530
		531	=item $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback)
		532
		533	=item $w = $loop->periodic_ns ($at, $interval, $reschedule_cb, $callback)
305		534
306	Similar to EV::timer, but is not based on relative timeouts but on	535	Similar to EV::timer, but is not based on relative timeouts but on
307	absolute times. Apart from creating "simple" timers that trigger "at" the	536	absolute times. Apart from creating "simple" timers that trigger "at" the
308	specified time, it can also be used for non-drifting absolute timers and	537	specified time, it can also be used for non-drifting absolute timers and
309	more complex, cron-like, setups that are not adversely affected by time	538	more complex, cron-like, setups that are not adversely affected by time
…		…
319	This time simply fires at the wallclock time C<$at> and doesn't repeat. It	548	This time simply fires at the wallclock time C<$at> and doesn't repeat. It
320	will not adjust when a time jump occurs, that is, if it is to be run	549	will not adjust when a time jump occurs, that is, if it is to be run
321	at January 1st 2011 then it will run when the system time reaches or	550	at January 1st 2011 then it will run when the system time reaches or
322	surpasses this time.	551	surpasses this time.
323		552
324	=item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0)	553	=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
325		554
326	In this mode the watcher will always be scheduled to time out at the	555	In this mode the watcher will always be scheduled to time out at the
327	next C<$at + N * $interval> time (for some integer N) and then repeat,	556	next C<$at + N * $interval> time (for some integer N) and then repeat,
328	regardless of any time jumps.	557	regardless of any time jumps.
329		558
…		…
341	possible time where C<$time = $at (mod $interval)>, regardless of any time	570	possible time where C<$time = $at (mod $interval)>, regardless of any time
342	jumps.	571	jumps.
343		572
344	=item * manual reschedule mode ($reschedule_cb = coderef)	573	=item * manual reschedule mode ($reschedule_cb = coderef)
345		574
346	In this mode $interval and $at are both being ignored. Instead, each time	575	In this mode $interval and $at are both being ignored. Instead, each
347	the periodic watcher gets scheduled, the first callback ($reschedule_cb)	576	time the periodic watcher gets scheduled, the reschedule callback
348	will be called with the watcher as first, and the current time as second	577	($reschedule_cb) will be called with the watcher as first, and the current
349	argument.	578	time as second argument.
350		579
351	I<This callback MUST NOT stop or destroy this or any other periodic	580	I<This callback MUST NOT stop or destroy this or any other periodic
352	watcher, ever>. If you need to stop it, return 1e30 and stop it	581	watcher, ever, and MUST NOT call any event loop functions or methods>. If
353	afterwards.	582	you need to stop it, return 1e30 and stop it afterwards. You may create
		583	and start a C<EV::prepare> watcher for this task.
354		584
355	It must return the next time to trigger, based on the passed time value	585	It must return the next time to trigger, based on the passed time value
356	(that is, the lowest time value larger than to the second argument). It	586	(that is, the lowest time value larger than or equal to to the second
357	will usually be called just before the callback will be triggered, but	587	argument). It will usually be called just before the callback will be
358	might be called at other times, too.	588	triggered, but might be called at other times, too.
359		589
360	This can be used to create very complex timers, such as a timer that	590	This can be used to create very complex timers, such as a timer that
361	triggers on each midnight, local time (actually 24 hours after the last	591	triggers on each midnight, local time (actually 24 hours after the last
362	midnight, to keep the example simple. If you know a way to do it correctly	592	midnight, to keep the example simple. If you know a way to do it correctly
363	in about the same space (without requiring elaborate modules), drop me a	593	in about the same space (without requiring elaborate modules), drop me a
…		…
377		607
378	The C<periodic_ns> variant doesn't start (activate) the newly created watcher.	608	The C<periodic_ns> variant doesn't start (activate) the newly created watcher.
379		609
380	=item $w->set ($at, $interval, $reschedule_cb)	610	=item $w->set ($at, $interval, $reschedule_cb)
381		611
382	Reconfigures the watcher, see the constructor above for details. Can be at	612	Reconfigures the watcher, see the constructor above for details. Can be called at
383	any time.	613	any time.
384		614
385	=item $w->again	615	=item $w->again
386		616
387	Simply stops and starts the watcher again.	617	Simply stops and starts the watcher again.
388		618
		619	=item $time = $w->at
		620
		621	Return the time that the watcher is expected to trigger next.
		622
		623	=back
		624
		625
		626	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!
		627
		628	=over 4
389		629
390	=item $w = EV::signal $signal, $callback	630	=item $w = EV::signal $signal, $callback
391		631
392	=item $w = EV::signal_ns $signal, $callback	632	=item $w = EV::signal_ns $signal, $callback
393		633
394	Call the callback when $signal is received (the signal can be specified	634	Call the callback when $signal is received (the signal can be specified by
395	by number or by name, just as with kill or %SIG).	635	number or by name, just as with C<kill> or C<%SIG>).
396		636
397	EV will grab the signal for the process (the kernel only allows one	637	EV will grab the signal for the process (the kernel only allows one
398	component to receive a signal at a time) when you start a signal watcher,	638	component to receive a signal at a time) when you start a signal watcher,
399	and removes it again when you stop it. Perl does the same when you	639	and removes it again when you stop it. Perl does the same when you
400	add/remove callbacks to %SIG, so watch out.	640	add/remove callbacks to C<%SIG>, so watch out.
401		641
402	You can have as many signal watchers per signal as you want.	642	You can have as many signal watchers per signal as you want.
403		643
404	The C<signal_ns> variant doesn't start (activate) the newly created watcher.	644	The C<signal_ns> variant doesn't start (activate) the newly created watcher.
405		645
406	=item $w->set ($signal)	646	=item $w->set ($signal)
407		647
408	Reconfigures the watcher, see the constructor above for details. Can be at	648	Reconfigures the watcher, see the constructor above for details. Can be
409	any time.	649	called at any time.
410		650
411	=item $current_signum = $w->signal	651	=item $current_signum = $w->signal
412		652
413	=item $old_signum = $w->signal ($new_signal)	653	=item $old_signum = $w->signal ($new_signal)
414		654
415	Returns the previously set signal (always as a number not name) and	655	Returns the previously set signal (always as a number not name) and
416	optionally set a new one.	656	optionally set a new one.
417		657
		658	=back
418		659
		660
		661	=head3 CHILD WATCHERS - watch out for process status changes
		662
		663	=over 4
		664
419	=item $w = EV::child $pid, $callback	665	=item $w = EV::child $pid, $trace, $callback
420		666
421	=item $w = EV::child_ns $pid, $callback	667	=item $w = EV::child_ns $pid, $trace, $callback
		668
		669	=item $w = $loop->child ($pid, $trace, $callback)
		670
		671	=item $w = $loop->child_ns ($pid, $trace, $callback)
422		672
423	Call the callback when a status change for pid C<$pid> (or any pid	673	Call the callback when a status change for pid C<$pid> (or any pid
424	if C<$pid> is 0) has been received. More precisely: when the process	674	if C<$pid> is 0) has been received (a status change happens when the
		675	process terminates or is killed, or, when trace is true, additionally when
		676	it is stopped or continued). More precisely: when the process receives
425	receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all	677	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all
426	changed/zombie children and call the callback.	678	changed/zombie children and call the callback.
427		679
428	You can access both status and pid by using the C<rstatus> and C<rpid>	680	It is valid (and fully supported) to install a child watcher after a child
429	methods on the watcher object.	681	has exited but before the event loop has started its next iteration (for
		682	example, first you C<fork>, then the new child process might exit, and
		683	only then do you install a child watcher in the parent for the new pid).
430		684
		685	You can access both exit (or tracing) status and pid by using the
		686	C<rstatus> and C<rpid> methods on the watcher object.
		687
431	You can have as many pid watchers per pid as you want.	688	You can have as many pid watchers per pid as you want, they will all be
		689	called.
432		690
433	The C<child_ns> variant doesn't start (activate) the newly created watcher.	691	The C<child_ns> variant doesn't start (activate) the newly created watcher.
434		692
435	=item $w->set ($pid)	693	=item $w->set ($pid, $trace)
436		694
437	Reconfigures the watcher, see the constructor above for details. Can be at	695	Reconfigures the watcher, see the constructor above for details. Can be called at
438	any time.	696	any time.
439		697
440	=item $current_pid = $w->pid	698	=item $current_pid = $w->pid
441
442	=item $old_pid = $w->pid ($new_pid)
443		699
444	Returns the previously set process id and optionally set a new one.	700	Returns the previously set process id and optionally set a new one.
445		701
446	=item $exit_status = $w->rstatus	702	=item $exit_status = $w->rstatus
447		703
…		…
451	=item $pid = $w->rpid	707	=item $pid = $w->rpid
452		708
453	Return the pid of the awaited child (useful when you have installed a	709	Return the pid of the awaited child (useful when you have installed a
454	watcher for all pids).	710	watcher for all pids).
455		711
		712	=back
		713
		714
		715	=head3 STAT WATCHERS - did the file attributes just change?
		716
		717	=over 4
		718
		719	=item $w = EV::stat $path, $interval, $callback
		720
		721	=item $w = EV::stat_ns $path, $interval, $callback
		722
		723	=item $w = $loop->stat ($path, $interval, $callback)
		724
		725	=item $w = $loop->stat_ns ($path, $interval, $callback)
		726
		727	Call the callback when a file status change has been detected on
		728	C<$path>. The C<$path> does not need to exist, changing from "path exists"
		729	to "path does not exist" is a status change like any other.
		730
		731	The C<$interval> is a recommended polling interval for systems where
		732	OS-supported change notifications don't exist or are not supported. If
		733	you use C<0> then an unspecified default is used (which is highly
		734	recommended!), which is to be expected to be around five seconds usually.
		735
		736	This watcher type is not meant for massive numbers of stat watchers,
		737	as even with OS-supported change notifications, this can be
		738	resource-intensive.
		739
		740	The C<stat_ns> variant doesn't start (activate) the newly created watcher.
		741
		742	=item ... = $w->stat
		743
		744	This call is very similar to the perl C<stat> built-in: It stats (using
		745	C<lstat>) the path specified in the watcher and sets perls stat cache (as
		746	well as EV's idea of the current stat values) to the values found.
		747
		748	In scalar context, a boolean is return indicating success or failure of
		749	the stat. In list context, the same 13-value list as with stat is returned
		750	(except that the blksize and blocks fields are not reliable).
		751
		752	In the case of an error, errno is set to C<ENOENT> (regardless of the
		753	actual error value) and the C<nlink> value is forced to zero (if the stat
		754	was successful then nlink is guaranteed to be non-zero).
		755
		756	See also the next two entries for more info.
		757
		758	=item ... = $w->attr
		759
		760	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		761	the values most recently detected by EV. See the next entry for more info.
		762
		763	=item ... = $w->prev
		764
		765	Just like C<< $w->stat >>, but without the initial stat'ing: this returns
		766	the previous set of values, before the change.
		767
		768	That is, when the watcher callback is invoked, C<< $w->prev >> will be set
		769	to the values found I<before> a change was detected, while C<< $w->attr >>
		770	returns the values found leading to the change detection. The difference (if any)
		771	between C<prev> and C<attr> is what triggered the callback.
		772
		773	If you did something to the filesystem object and do not want to trigger
		774	yet another change, you can call C<stat> to update EV's idea of what the
		775	current attributes are.
		776
		777	=item $w->set ($path, $interval)
		778
		779	Reconfigures the watcher, see the constructor above for details. Can be
		780	called at any time.
		781
		782	=item $current_path = $w->path
		783
		784	=item $old_path = $w->path ($new_path)
		785
		786	Returns the previously set path and optionally set a new one.
		787
		788	=item $current_interval = $w->interval
		789
		790	=item $old_interval = $w->interval ($new_interval)
		791
		792	Returns the previously set interval and optionally set a new one. Can be
		793	used to query the actual interval used.
		794
		795	=back
		796
		797
		798	=head3 IDLE WATCHERS - when you've got nothing better to do...
		799
		800	=over 4
456		801
457	=item $w = EV::idle $callback	802	=item $w = EV::idle $callback
458		803
459	=item $w = EV::idle_ns $callback	804	=item $w = EV::idle_ns $callback
460		805
461	Call the callback when there are no pending io, timer/periodic, signal or	806	=item $w = $loop->idle ($callback)
462	child events, i.e. when the process is idle.	807
		808	=item $w = $loop->idle_ns ($callback)
		809
		810	Call the callback when there are no other pending watchers of the same or
		811	higher priority (excluding check, prepare and other idle watchers of the
		812	same or lower priority, of course). They are called idle watchers because
		813	when the watcher is the highest priority pending event in the process, the
		814	process is considered to be idle at that priority.
		815
		816	If you want a watcher that is only ever called when I<no> other events are
		817	outstanding you have to set the priority to C<EV::MINPRI>.
463		818
464	The process will not block as long as any idle watchers are active, and	819	The process will not block as long as any idle watchers are active, and
465	they will be called repeatedly until stopped.	820	they will be called repeatedly until stopped.
466		821
		822	For example, if you have idle watchers at priority C<0> and C<1>, and
		823	an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
		824	and the I/O watcher will always run when ready. Only when the idle watcher
		825	at priority C<1> is stopped and the I/O watcher at priority C<0> is not
		826	pending with the C<0>-priority idle watcher be invoked.
		827
467	The C<idle_ns> variant doesn't start (activate) the newly created watcher.	828	The C<idle_ns> variant doesn't start (activate) the newly created watcher.
468		829
		830	=back
		831
		832
		833	=head3 PREPARE WATCHERS - customise your event loop!
		834
		835	=over 4
469		836
470	=item $w = EV::prepare $callback	837	=item $w = EV::prepare $callback
471		838
472	=item $w = EV::prepare_ns $callback	839	=item $w = EV::prepare_ns $callback
		840
		841	=item $w = $loop->prepare ($callback)
		842
		843	=item $w = $loop->prepare_ns ($callback)
473		844
474	Call the callback just before the process would block. You can still	845	Call the callback just before the process would block. You can still
475	create/modify any watchers at this point.	846	create/modify any watchers at this point.
476		847
477	See the EV::check watcher, below, for explanations and an example.	848	See the EV::check watcher, below, for explanations and an example.
478		849
479	The C<prepare_ns> variant doesn't start (activate) the newly created watcher.	850	The C<prepare_ns> variant doesn't start (activate) the newly created watcher.
480		851
		852	=back
		853
		854
		855	=head3 CHECK WATCHERS - customise your event loop even more!
		856
		857	=over 4
481		858
482	=item $w = EV::check $callback	859	=item $w = EV::check $callback
483		860
484	=item $w = EV::check_ns $callback	861	=item $w = EV::check_ns $callback
		862
		863	=item $w = $loop->check ($callback)
		864
		865	=item $w = $loop->check_ns ($callback)
485		866
486	Call the callback just after the process wakes up again (after it has	867	Call the callback just after the process wakes up again (after it has
487	gathered events), but before any other callbacks have been invoked.	868	gathered events), but before any other callbacks have been invoked.
488		869
489	This is used to integrate other event-based software into the EV	870	This is used to integrate other event-based software into the EV
…		…
497	# do nothing unless active	878	# do nothing unless active
498	$dispatcher->{_event_queue_h}	879	$dispatcher->{_event_queue_h}
499	or return;	880	or return;
500		881
501	# make the dispatcher handle any outstanding stuff	882	# make the dispatcher handle any outstanding stuff
		883	... not shown
502		884
503	# create an IO watcher for each and every socket	885	# create an I/O watcher for each and every socket
504	@snmp_watcher = (	886	@snmp_watcher = (
505	(map { EV::io $_, EV::READ, sub { } }	887	(map { EV::io $_, EV::READ, sub { } }
506	keys %{ $dispatcher->{_descriptors} }),	888	keys %{ $dispatcher->{_descriptors} }),
		889
		890	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
		891	? $event->[Net::SNMP::Dispatcher::_TIME] - EV::now : 0),
		892	0, sub { },
507	);	893	);
508
509	# if there are any timeouts, also create a timer
510	push @snmp_watcher, EV::timer $event->[Net::SNMP::Dispatcher::_TIME] - EV::now, 0, sub { }
511	if $event->[Net::SNMP::Dispatcher::_ACTIVE];
512	};	894	};
513		895
514	The callbacks are irrelevant, the only purpose of those watchers is	896	The callbacks are irrelevant (and are not even being called), the
515	to wake up the process as soon as one of those events occurs (socket	897	only purpose of those watchers is to wake up the process as soon as
516	readable, or timer timed out). The corresponding EV::check watcher will then	898	one of those events occurs (socket readable, or timer timed out). The
517	clean up:	899	corresponding EV::check watcher will then clean up:
518		900
519	our $snmp_check = EV::check sub {	901	our $snmp_check = EV::check sub {
520	# destroy all watchers	902	# destroy all watchers
521	@snmp_watcher = ();	903	@snmp_watcher = ();
522		904
523	# make the dispatcher handle any new stuff	905	# make the dispatcher handle any new stuff
		906	... not shown
524	};	907	};
525		908
526	The callbacks of the created watchers will not be called as the watchers	909	The callbacks of the created watchers will not be called as the watchers
527	are destroyed before this cna happen (remember EV::check gets called	910	are destroyed before this cna happen (remember EV::check gets called
528	first).	911	first).
529		912
530	The C<check_ns> variant doesn't start (activate) the newly created watcher.	913	The C<check_ns> variant doesn't start (activate) the newly created watcher.
531		914
532	=back	915	=back
533		916
		917
		918	=head3 FORK WATCHERS - the audacity to resume the event loop after a fork
		919
		920	Fork watchers are called when a C<fork ()> was detected. The invocation
		921	is done before the event loop blocks next and before C<check> watchers
		922	are being called, and only in the child after the fork.
		923
		924	=over 4
		925
		926	=item $w = EV::fork $callback
		927
		928	=item $w = EV::fork_ns $callback
		929
		930	=item $w = $loop->fork ($callback)
		931
		932	=item $w = $loop->fork_ns ($callback)
		933
		934	Call the callback before the event loop is resumed in the child process
		935	after a fork.
		936
		937	The C<fork_ns> variant doesn't start (activate) the newly created watcher.
		938
		939	=back
		940
		941
		942	=head3 EMBED WATCHERS - when one backend isn't enough...
		943
		944	This is a rather advanced watcher type that lets you embed one event loop
		945	into another (currently only IO events are supported in the embedded
		946	loop, other types of watchers might be handled in a delayed or incorrect
		947	fashion and must not be used).
		948
		949	See the libev documentation at
		950	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
		951	for more details.
		952
		953	In short, this watcher is most useful on BSD systems without working
		954	kqueue to still be able to handle a large number of sockets:
		955
		956	my $socket_loop;
		957
		958	# check wether we use SELECT or POLL _and_ KQUEUE is supported
		959	if (
		960	(EV::backend & (EV::BACKEND_POLL \| EV::BACKEND_SELECT))
		961	&& (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
		962	) {
		963	# use kqueue for sockets
		964	$socket_loop = new EV::Loop EV::BACKEND_KQUEUE \| EV::FLAG_NOENV;
		965	}
		966
		967	# use the default loop otherwise
		968	$socket_loop \|\|= EV::default_loop;
		969
		970	=over 4
		971
		972	=item $w = EV::embed $otherloop, $callback
		973
		974	=item $w = EV::embed_ns $otherloop, $callback
		975
		976	=item $w = $loop->embed ($otherloop, $callback)
		977
		978	=item $w = $loop->embed_ns ($otherloop, $callback)
		979
		980	Call the callback when the embedded event loop (C<$otherloop>) has any
		981	I/O activity. The C<$callback> should alwas be specified as C<undef> in
		982	this version of EV, which means the embedded event loop will be managed
		983	automatically.
		984
		985	The C<embed_ns> variant doesn't start (activate) the newly created watcher.
		986
		987	=back
		988
		989	=head3 ASYNC WATCHERS - how to wake up another event loop
		990
		991	Async watchers are provided by EV, but have little use in perl directly, as perl
		992	neither supports threads nor direct access to signal handlers or other
		993	contexts where they could be of value.
		994
		995	It is, however, possible to use them from the XS level.
		996
		997	Please see the libev documentation for further details.
		998
		999	=over 4
		1000
		1001	=item $w = EV::async $callback
		1002
		1003	=item $w = EV::async_ns $callback
		1004
		1005	=item $w->send
		1006
		1007	=item $bool = $w->async_pending
		1008
		1009	=back
		1010
		1011
		1012	=head1 PERL SIGNALS
		1013
		1014	While Perl signal handling (C<%SIG>) is not affected by EV, the behaviour
		1015	with EV is as the same as any other C library: Perl-signals will only be
		1016	handled when Perl runs, which means your signal handler might be invoked
		1017	only the next time an event callback is invoked.
		1018
		1019	The solution is to use EV signal watchers (see C<EV::signal>), which will
		1020	ensure proper operations with regards to other event watchers.
		1021
		1022	If you cannot do this for whatever reason, you can also force a watcher
		1023	to be called on every event loop iteration by installing a C<EV::check>
		1024	watcher:
		1025
		1026	my $async_check = EV::check sub { };
		1027
		1028	This ensures that perl gets into control for a short time to handle any
		1029	pending signals, and also ensures (slightly) slower overall operation.
		1030
534	=head1 THREADS	1031	=head1 THREADS
535		1032
536	Threads are not supported by this in any way. Perl pseudo-threads is evil	1033	Threads are not supported by this module in any way. Perl pseudo-threads
537	stuff and must die.	1034	is evil stuff and must die. As soon as Perl gains real threads I will work
		1035	on thread support for it.
		1036
		1037	=head1 FORK
		1038
		1039	Most of the "improved" event delivering mechanisms of modern operating
		1040	systems have quite a few problems with fork(2) (to put it bluntly: it is
		1041	not supported and usually destructive). Libev makes it possible to work
		1042	around this by having a function that recreates the kernel state after
		1043	fork in the child.
		1044
		1045	On non-win32 platforms, this module requires the pthread_atfork
		1046	functionality to do this automatically for you. This function is quite
		1047	buggy on most BSDs, though, so YMMV. The overhead for this is quite
		1048	negligible, because everything the function currently does is set a flag
		1049	that is checked only when the event loop gets used the next time, so when
		1050	you do fork but not use EV, the overhead is minimal.
		1051
		1052	On win32, there is no notion of fork so all this doesn't apply, of course.
538		1053
539	=cut	1054	=cut
540		1055
541	our $DIED = sub {	1056	our $DIED = sub {
542	warn "EV: error in callback (ignoring): $@";	1057	warn "EV: error in callback (ignoring): $@";
543	};	1058	};
544		1059
545	default_loop	1060	default_loop
546	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?';	1061	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?';
547		1062
548	1;	1063	1;
549		1064
550	=head1 SEE ALSO	1065	=head1 SEE ALSO
551		1066
552	L<EV::DNS>, L<EV::AnyEvent>.	1067	L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as
		1068	event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient
		1069	coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
		1070	event-loop agnostic and portable event driven programming.
553		1071
554	=head1 AUTHOR	1072	=head1 AUTHOR
555		1073
556	Marc Lehmann <schmorp@schmorp.de>	1074	Marc Lehmann <schmorp@schmorp.de>
557	http://home.schmorp.de/	1075	http://home.schmorp.de/

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Comparing EV/EV.pm (file contents): Revision 1.34 by root, Fri Nov 9 19:38:56 2007 UTC vs. Revision 1.97 by root, Mon May 26 05:37:18 2008 UTC

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Comparing EV/EV.pm (file contents):
Revision 1.34 by root, Fri Nov 9 19:38:56 2007 UTC vs.
Revision 1.97 by root, Mon May 26 05:37:18 2008 UTC