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

Comparing EV/EV.pm (file contents):
Revision 1.59 by root, Sat Dec 1 22:51:34 2007 UTC vs.
Revision 1.93 by root, Tue May 20 19:52:12 2008 UTC

…		…
35	warn "sigquit received\n";	35	warn "sigquit received\n";
36	};	36	};
37		37
38	# CHILD/PID STATUS CHANGES	38	# CHILD/PID STATUS CHANGES
39		39
40	my $w = EV::child 666, sub {	40	my $w = EV::child 666, 0, sub {
41	my ($w, $revents) = @_;	41	my ($w, $revents) = @_;
42	my $status = $w->rstatus;	42	my $status = $w->rstatus;
43	};	43	};
44		44
45	# STAT CHANGES	45	# STAT CHANGES
…		…
56	=head1 DESCRIPTION	56	=head1 DESCRIPTION
57		57
58	This module provides an interface to libev	58	This module provides an interface to libev
59	(L<http://software.schmorp.de/pkg/libev.html>). While the documentation	59	(L<http://software.schmorp.de/pkg/libev.html>). While the documentation
60	below is comprehensive, one might also consult the documentation of libev	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	61	itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>) for more
62	watcher semantics or some discussion on the available backends, or how to	62	subtle details on watcher semantics or some discussion on the available
63	force a specific backend with C<LIBEV_FLAGS>.	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.
64		71
65	=cut	72	=cut
66		73
67	package EV;	74	package EV;
68		75
69	use strict;	76	use strict;
70		77
71	BEGIN {	78	BEGIN {
72	our $VERSION = '1.5';	79	our $VERSION = '3.4';
73	use XSLoader;	80	use XSLoader;
74	XSLoader::load "EV", $VERSION;	81	XSLoader::load "EV", $VERSION;
75	}	82	}
76		83
77	@EV::IO::ISA =	84	@EV::IO::ISA =
…		…
83	@EV::Idle::ISA =	90	@EV::Idle::ISA =
84	@EV::Prepare::ISA =	91	@EV::Prepare::ISA =
85	@EV::Check::ISA =	92	@EV::Check::ISA =
86	@EV::Embed::ISA =	93	@EV::Embed::ISA =
87	@EV::Fork::ISA =	94	@EV::Fork::ISA =
		95	@EV::Async::ISA =
88	"EV::Watcher";	96	"EV::Watcher";
89		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 fucntion automatically, at some performance loss (refer to the libev
		136	documentation).
		137
		138	=item $loop = EV::default_loop [$flags]
		139
		140	Return the default loop (which is a singleton object).
		141
		142	=back
		143
		144
90	=head1 BASIC INTERFACE	145	=head1 BASIC INTERFACE
91		146
92	=over 4	147	=over 4
93		148
94	=item $EV::DIED	149	=item $EV::DIED
95		150
96	Must contain a reference to a function that is called when a callback	151	Must contain a reference to a function that is called when a callback
97	throws an exception (with $@ containing thr error). The default prints an	152	throws an exception (with $@ containing the error). The default prints an
98	informative message and continues.	153	informative message and continues.
99		154
100	If this callback throws an exception it will be silently ignored.	155	If this callback throws an exception it will be silently ignored.
101		156
		157	=item $flags = EV::supported_backends
		158
		159	=item $flags = EV::recommended_backends
		160
		161	=item $flags = EV::embeddable_backends
		162
		163	Returns the set (see C<EV::BACKEND_*> flags) of backends supported by this
		164	instance of EV, the set of recommended backends (supposed to be good) for
		165	this platform and the set of embeddable backends (see EMBED WATCHERS).
		166
		167	=item EV::sleep $seconds
		168
		169	Block the process for the given number of (fractional) seconds.
		170
102	=item $time = EV::time	171	=item $time = EV::time
103		172
104	Returns the current time in (fractional) seconds since the epoch.	173	Returns the current time in (fractional) seconds since the epoch.
105		174
106	=item $time = EV::now	175	=item $time = EV::now
		176
		177	=item $time = $loop->now
107		178
108	Returns the time the last event loop iteration has been started. This	179	Returns the time the last event loop iteration has been started. This
109	is the time that (relative) timers are based on, and refering to it is	180	is the time that (relative) timers are based on, and refering to it is
110	usually faster then calling EV::time.	181	usually faster then calling EV::time.
111		182
112	=item $method = EV::method	183	=item $backend = EV::backend
		184
		185	=item $backend = $loop->backend
113		186
114	Returns an integer describing the backend used by libev (EV::METHOD_SELECT	187	Returns an integer describing the backend used by libev (EV::METHOD_SELECT
115	or EV::METHOD_EPOLL).	188	or EV::METHOD_EPOLL).
116		189
117	=item EV::loop [$flags]	190	=item EV::loop [$flags]
		191
		192	=item $loop->loop ([$flags])
118		193
119	Begin checking for events and calling callbacks. It returns when a	194	Begin checking for events and calling callbacks. It returns when a
120	callback calls EV::unloop.	195	callback calls EV::unloop.
121		196
122	The $flags argument can be one of the following:	197	The $flags argument can be one of the following:
…		…
125	EV::LOOP_ONESHOT block at most once (wait, but do not loop)	200	EV::LOOP_ONESHOT block at most once (wait, but do not loop)
126	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)	201	EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
127		202
128	=item EV::unloop [$how]	203	=item EV::unloop [$how]
129		204
		205	=item $loop->unloop ([$how])
		206
130	When called with no arguments or an argument of EV::UNLOOP_ONE, makes the	207	When called with no arguments or an argument of EV::UNLOOP_ONE, makes the
131	innermost call to EV::loop return.	208	innermost call to EV::loop return.
132		209
133	When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as	210	When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as
134	fast as possible.	211	fast as possible.
135		212
		213	=item $count = EV::loop_count
		214
		215	=item $count = $loop->loop_count
		216
		217	Return the number of times the event loop has polled for new
		218	events. Sometiems useful as a generation counter.
		219
136	=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)	220	=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
		221
		222	=item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents))
137		223
138	This function rolls together an I/O and a timer watcher for a single	224	This function rolls together an I/O and a timer watcher for a single
139	one-shot event without the need for managing a watcher object.	225	one-shot event without the need for managing a watcher object.
140		226
141	If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events>	227	If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events>
…		…
147	If timeout is C<undef> or negative, then there will be no	233	If timeout is C<undef> or negative, then there will be no
148	timeout. Otherwise a EV::timer with this value will be started.	234	timeout. Otherwise a EV::timer with this value will be started.
149		235
150	When an error occurs or either the timeout or I/O watcher triggers, then	236	When an error occurs or either the timeout or I/O watcher triggers, then
151	the callback will be called with the received event set (in general	237	the callback will be called with the received event set (in general
152	you can expect it to be a combination of C<EV:ERROR>, C<EV::READ>,	238	you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
153	C<EV::WRITE> and C<EV::TIMEOUT>).	239	C<EV::WRITE> and C<EV::TIMEOUT>).
154		240
155	EV::once doesn't return anything: the watchers stay active till either	241	EV::once doesn't return anything: the watchers stay active till either
156	of them triggers, then they will be stopped and freed, and the callback	242	of them triggers, then they will be stopped and freed, and the callback
157	invoked.	243	invoked.
158		244
159	=back	245	=item EV::feed_fd_event ($fd, $revents)
160		246
		247	=item $loop->feed_fd_event ($fd, $revents)
		248
		249	Feed an event on a file descriptor into EV. EV will react to this call as
		250	if the readyness notifications specified by C<$revents> (a combination of
		251	C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>.
		252
		253	=item EV::feed_signal_event ($signal)
		254
		255	Feed a signal event into EV. EV will react to this call as if the signal
		256	specified by C<$signal> had occured.
		257
		258	=item EV::set_io_collect_interval $time
		259
		260	=item $loop->set_io_collect_interval ($time)
		261
		262	=item EV::set_timeout_collect_interval $time
		263
		264	=item $loop->set_timeout_collect_interval ($time)
		265
		266	These advanced functions set the minimum block interval when polling for I/O events and the minimum
		267	wait interval for timer events. See the libev documentation at
		268	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for
		269	a more detailed discussion.
		270
		271	=back
		272
		273
161	=head2 WATCHER OBJECTS	274	=head1 WATCHER OBJECTS
162		275
163	A watcher is an object that gets created to record your interest in some	276	A watcher is an object that gets created to record your interest in some
164	event. For instance, if you want to wait for STDIN to become readable, you	277	event. For instance, if you want to wait for STDIN to become readable, you
165	would create an EV::io watcher for that:	278	would create an EV::io watcher for that:
166		279
167	my $watcher = EV::io *STDIN, EV::READ, sub {	280	my $watcher = EV::io *STDIN, EV::READ, sub {
168	my ($watcher, $revents) = @_;	281	my ($watcher, $revents) = @_;
169	warn "yeah, STDIN should not be readable without blocking!\n"	282	warn "yeah, STDIN should now be readable without blocking!\n"
170	};	283	};
171		284
172	All watchers can be active (waiting for events) or inactive (paused). Only	285	All watchers can be active (waiting for events) or inactive (paused). Only
173	active watchers will have their callbacks invoked. All callbacks will be	286	active watchers will have their callbacks invoked. All callbacks will be
174	called with at least two arguments: the watcher and a bitmask of received	287	called with at least two arguments: the watcher and a bitmask of received
175	events.	288	events.
176		289
177	Each watcher type has its associated bit in revents, so you can use the	290	Each watcher type has its associated bit in revents, so you can use the
178	same callback for multiple watchers. The event mask is named after the	291	same callback for multiple watchers. The event mask is named after the
179	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,	292	type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
180	EV::periodic sets EV::PERIODIC and so on, with the exception of IO events	293	EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events
181	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which	294	(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
182	uses EV::TIMEOUT).	295	uses EV::TIMEOUT).
183		296
184	In the rare case where one wants to create a watcher but not start it at	297	In the rare case where one wants to create a watcher but not start it at
185	the same time, each constructor has a variant with a trailing C<_ns> in	298	the same time, each constructor has a variant with a trailing C<_ns> in
…		…
207		320
208	=item $w->stop	321	=item $w->stop
209		322
210	Stop a watcher if it is active. Also clear any pending events (events that	323	Stop a watcher if it is active. Also clear any pending events (events that
211	have been received but that didn't yet result in a callback invocation),	324	have been received but that didn't yet result in a callback invocation),
212	regardless of wether the watcher was active or not.	325	regardless of whether the watcher was active or not.
213		326
214	=item $bool = $w->is_active	327	=item $bool = $w->is_active
215		328
216	Returns true if the watcher is active, false otherwise.	329	Returns true if the watcher is active, false otherwise.
217		330
…		…
247	The default priority of any newly-created watcher is 0.	360	The default priority of any newly-created watcher is 0.
248		361
249	Note that the priority semantics have not yet been fleshed out and are	362	Note that the priority semantics have not yet been fleshed out and are
250	subject to almost certain change.	363	subject to almost certain change.
251		364
252	=item $w->trigger ($revents)	365	=item $w->invoke ($revents)
253		366
254	Call the callback now with the given event mask.	367	Call the callback now with the given event mask.
		368
		369	=item $w->feed_event ($revents)
		370
		371	Feed some events on this watcher into EV. EV will react to this call as if
		372	the watcher had received the given C<$revents> mask.
		373
		374	=item $revents = $w->clear_pending
		375
		376	If the watcher is pending, this function clears its pending status and
		377	returns its C<$revents> bitset (as if its callback was invoked). If the
		378	watcher isn't pending it does nothing and returns C<0>.
255		379
256	=item $previous_state = $w->keepalive ($bool)	380	=item $previous_state = $w->keepalive ($bool)
257		381
258	Normally, C<EV::loop> will return when there are no active watchers	382	Normally, C<EV::loop> will return when there are no active watchers
259	(which is a "deadlock" because no progress can be made anymore). This is	383	(which is a "deadlock" because no progress can be made anymore). This is
260	convinient because it allows you to start your watchers (and your jobs),	384	convinient because it allows you to start your watchers (and your jobs),
261	call C<EV::loop> once and when it returns you know that all your jobs are	385	call C<EV::loop> once and when it returns you know that all your jobs are
262	finished (or they forgot to register some watchers for their task :).	386	finished (or they forgot to register some watchers for their task :).
263		387
264	Sometimes, however, this gets in your way, for example when you the module	388	Sometimes, however, this gets in your way, for example when the module
265	that calls C<EV::loop> (usually the main program) is not the same module	389	that calls C<EV::loop> (usually the main program) is not the same module
266	as a long-living watcher (for example a DNS client module written by	390	as a long-living watcher (for example a DNS client module written by
267	somebody else even). Then you might want any outstanding requests to be	391	somebody else even). Then you might want any outstanding requests to be
268	handled, but you would not want to keep C<EV::loop> from returning just	392	handled, but you would not want to keep C<EV::loop> from returning just
269	because you happen to have this long-running UDP port watcher.	393	because you happen to have this long-running UDP port watcher.
…		…
272	though your watcher is active, it won't keep C<EV::loop> from returning.	396	though your watcher is active, it won't keep C<EV::loop> from returning.
273		397
274	The initial value for keepalive is true (enabled), and you cna change it	398	The initial value for keepalive is true (enabled), and you cna change it
275	any time.	399	any time.
276		400
277	Example: Register an IO watcher for some UDP socket but do not keep the	401	Example: Register an I/O watcher for some UDP socket but do not keep the
278	event loop from running just because of that watcher.	402	event loop from running just because of that watcher.
279		403
280	my $udp_socket = ...	404	my $udp_socket = ...
281	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };	405	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
282	$udp_watcher->keepalive (0);	406	$1000udp_watcher->keepalive (0);
283		407
284	=back	408	=item $loop = $w->loop
285		409
		410	Return the loop that this watcher is attached to.
286		411
		412	=back
		413
		414
287	=head2 WATCHER TYPES	415	=head1 WATCHER TYPES
288		416
289	Each of the following subsections describes a single watcher type.	417	Each of the following subsections describes a single watcher type.
290		418
291	=head3 IO WATCHERS - is this file descriptor readable or writable?	419	=head3 I/O WATCHERS - is this file descriptor readable or writable?
292		420
293	=over 4	421	=over 4
294		422
295	=item $w = EV::io $fileno_or_fh, $eventmask, $callback	423	=item $w = EV::io $fileno_or_fh, $eventmask, $callback
296		424
297	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback	425	=item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
		426
		427	=item $w = $loop->io ($fileno_or_fh, $eventmask, $callback)
		428
		429	=item $w = $loop->io_ns ($fileno_or_fh, $eventmask, $callback)
298		430
299	As long as the returned watcher object is alive, call the C<$callback>	431	As long as the returned watcher object is alive, call the C<$callback>
300	when at least one of events specified in C<$eventmask> occurs.	432	when at least one of events specified in C<$eventmask> occurs.
301		433
302	The $eventmask can be one or more of these constants ORed together:	434	The $eventmask can be one or more of these constants ORed together:
…		…
331	=over 4	463	=over 4
332		464
333	=item $w = EV::timer $after, $repeat, $callback	465	=item $w = EV::timer $after, $repeat, $callback
334		466
335	=item $w = EV::timer_ns $after, $repeat, $callback	467	=item $w = EV::timer_ns $after, $repeat, $callback
		468
		469	=item $w = $loop->timer ($after, $repeat, $callback)
		470
		471	=item $w = $loop->timer_ns ($after, $repeat, $callback)
336		472
337	Calls the callback after C<$after> seconds (which may be fractional). If	473	Calls the callback after C<$after> seconds (which may be fractional). If
338	C<$repeat> is non-zero, the timer will be restarted (with the $repeat	474	C<$repeat> is non-zero, the timer will be restarted (with the $repeat
339	value as $after) after the callback returns.	475	value as $after) after the callback returns.
340		476
…		…
381	=over 4	517	=over 4
382		518
383	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback	519	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback
384		520
385	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback	521	=item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback
		522
		523	=item $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback)
		524
		525	=item $w = $loop->periodic_ns ($at, $interval, $reschedule_cb, $callback)
386		526
387	Similar to EV::timer, but is not based on relative timeouts but on	527	Similar to EV::timer, but is not based on relative timeouts but on
388	absolute times. Apart from creating "simple" timers that trigger "at" the	528	absolute times. Apart from creating "simple" timers that trigger "at" the
389	specified time, it can also be used for non-drifting absolute timers and	529	specified time, it can also be used for non-drifting absolute timers and
390	more complex, cron-like, setups that are not adversely affected by time	530	more complex, cron-like, setups that are not adversely affected by time
…		…
400	This time simply fires at the wallclock time C<$at> and doesn't repeat. It	540	This time simply fires at the wallclock time C<$at> and doesn't repeat. It
401	will not adjust when a time jump occurs, that is, if it is to be run	541	will not adjust when a time jump occurs, that is, if it is to be run
402	at January 1st 2011 then it will run when the system time reaches or	542	at January 1st 2011 then it will run when the system time reaches or
403	surpasses this time.	543	surpasses this time.
404		544
405	=item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0)	545	=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
406		546
407	In this mode the watcher will always be scheduled to time out at the	547	In this mode the watcher will always be scheduled to time out at the
408	next C<$at + N * $interval> time (for some integer N) and then repeat,	548	next C<$at + N * $interval> time (for some integer N) and then repeat,
409	regardless of any time jumps.	549	regardless of any time jumps.
410		550
…		…
465		605
466	=item $w->again	606	=item $w->again
467		607
468	Simply stops and starts the watcher again.	608	Simply stops and starts the watcher again.
469		609
		610	=item $time = $w->at
		611
		612	Return the time that the watcher is expected to trigger next.
		613
470	=back	614	=back
471		615
472		616
473	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!	617	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!
474		618
…		…
507		651
508	=head3 CHILD WATCHERS - watch out for process status changes	652	=head3 CHILD WATCHERS - watch out for process status changes
509		653
510	=over 4	654	=over 4
511		655
512	=item $w = EV::child $pid, $callback	656	=item $w = EV::child $pid, $trace, $callback
513		657
514	=item $w = EV::child_ns $pid, $callback	658	=item $w = EV::child_ns $pid, $trace, $callback
515		659
		660	=item $w = $loop->child ($pid, $trace, $callback)
		661
		662	=item $w = $loop->child_ns ($pid, $trace, $callback)
		663
516	Call the callback when a status change for pid C<$pid> (or any pid if	664	Call the callback when a status change for pid C<$pid> (or any pid
517	C<$pid> is 0) has been received. More precisely: when the process receives	665	if C<$pid> is 0) has been received (a status change happens when the
		666	process terminates or is killed, or, when trace is true, additionally when
		667	it is stopped or continued). More precisely: when the process receives
518	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all	668	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all
519	changed/zombie children and call the callback.	669	changed/zombie children and call the callback.
520		670
521	It is valid (and fully supported) to install a child watcher after a child	671	It is valid (and fully supported) to install a child watcher after a child
522	has exited but before the event loop has started its next iteration (for	672	has exited but before the event loop has started its next iteration (for
…		…
529	You can have as many pid watchers per pid as you want, they will all be	679	You can have as many pid watchers per pid as you want, they will all be
530	called.	680	called.
531		681
532	The C<child_ns> variant doesn't start (activate) the newly created watcher.	682	The C<child_ns> variant doesn't start (activate) the newly created watcher.
533		683
534	=item $w->set ($pid)	684	=item $w->set ($pid, $trace)
535		685
536	Reconfigures the watcher, see the constructor above for details. Can be called at	686	Reconfigures the watcher, see the constructor above for details. Can be called at
537	any time.	687	any time.
538		688
539	=item $current_pid = $w->pid	689	=item $current_pid = $w->pid
540		690
541	=item $old_pid = $w->pid ($new_pid)
542
543	Returns the previously set process id and optionally set a new one.	691	Returns the previously set process id and optionally set a new one.
544		692
545	=item $exit_status = $w->rstatus	693	=item $exit_status = $w->rstatus
546		694
547	Return the exit/wait status (as returned by waitpid, see the waitpid entry	695	Return the exit/wait status (as returned by waitpid, see the waitpid entry
…		…
560	=over 4	708	=over 4
561		709
562	=item $w = EV::stat $path, $interval, $callback	710	=item $w = EV::stat $path, $interval, $callback
563		711
564	=item $w = EV::stat_ns $path, $interval, $callback	712	=item $w = EV::stat_ns $path, $interval, $callback
		713
		714	=item $w = $loop->stat ($path, $interval, $callback)
		715
		716	=item $w = $loop->stat_ns ($path, $interval, $callback)
565		717
566	Call the callback when a file status change has been detected on	718	Call the callback when a file status change has been detected on
567	C<$path>. The C<$path> does not need to exist, changing from "path exists"	719	C<$path>. The C<$path> does not need to exist, changing from "path exists"
568	to "path does not exist" is a status change like any other.	720	to "path does not exist" is a status change like any other.
569		721
…		…
640		792
641	=item $w = EV::idle $callback	793	=item $w = EV::idle $callback
642		794
643	=item $w = EV::idle_ns $callback	795	=item $w = EV::idle_ns $callback
644		796
645	Call the callback when there are no pending io, timer/periodic, signal or	797	=item $w = $loop->idle ($callback)
646	child events, i.e. when the process is idle.	798
		799	=item $w = $loop->idle_ns ($callback)
		800
		801	Call the callback when there are no other pending watchers of the same or
		802	higher priority (excluding check, prepare and other idle watchers of the
		803	same or lower priority, of course). They are called idle watchers because
		804	when the watcher is the highest priority pending event in the process, the
		805	process is considered to be idle at that priority.
		806
		807	If you want a watcher that is only ever called when I<no> other events are
		808	outstanding you have to set the priority to C<EV::MINPRI>.
647		809
648	The process will not block as long as any idle watchers are active, and	810	The process will not block as long as any idle watchers are active, and
649	they will be called repeatedly until stopped.	811	they will be called repeatedly until stopped.
650		812
		813	For example, if you have idle watchers at priority C<0> and C<1>, and
		814	an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
		815	and the I/O watcher will always run when ready. Only when the idle watcher
		816	at priority C<1> is stopped and the I/O watcher at priority C<0> is not
		817	pending with the C<0>-priority idle watcher be invoked.
		818
651	The C<idle_ns> variant doesn't start (activate) the newly created watcher.	819	The C<idle_ns> variant doesn't start (activate) the newly created watcher.
652		820
653	=back	821	=back
654		822
655		823
…		…
658	=over 4	826	=over 4
659		827
660	=item $w = EV::prepare $callback	828	=item $w = EV::prepare $callback
661		829
662	=item $w = EV::prepare_ns $callback	830	=item $w = EV::prepare_ns $callback
		831
		832	=item $w = $loop->prepare ($callback)
		833
		834	=item $w = $loop->prepare_ns ($callback)
663		835
664	Call the callback just before the process would block. You can still	836	Call the callback just before the process would block. You can still
665	create/modify any watchers at this point.	837	create/modify any watchers at this point.
666		838
667	See the EV::check watcher, below, for explanations and an example.	839	See the EV::check watcher, below, for explanations and an example.
…		…
676	=over 4	848	=over 4
677		849
678	=item $w = EV::check $callback	850	=item $w = EV::check $callback
679		851
680	=item $w = EV::check_ns $callback	852	=item $w = EV::check_ns $callback
		853
		854	=item $w = $loop->check ($callback)
		855
		856	=item $w = $loop->check_ns ($callback)
681		857
682	Call the callback just after the process wakes up again (after it has	858	Call the callback just after the process wakes up again (after it has
683	gathered events), but before any other callbacks have been invoked.	859	gathered events), but before any other callbacks have been invoked.
684		860
685	This is used to integrate other event-based software into the EV	861	This is used to integrate other event-based software into the EV
…		…
695	or return;	871	or return;
696		872
697	# make the dispatcher handle any outstanding stuff	873	# make the dispatcher handle any outstanding stuff
698	... not shown	874	... not shown
699		875
700	# create an IO watcher for each and every socket	876	# create an I/O watcher for each and every socket
701	@snmp_watcher = (	877	@snmp_watcher = (
702	(map { EV::io $_, EV::READ, sub { } }	878	(map { EV::io $_, EV::READ, sub { } }
703	keys %{ $dispatcher->{_descriptors} }),	879	keys %{ $dispatcher->{_descriptors} }),
704		880
705	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]	881	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
…		…
740		916
741	=item $w = EV::fork $callback	917	=item $w = EV::fork $callback
742		918
743	=item $w = EV::fork_ns $callback	919	=item $w = EV::fork_ns $callback
744		920
		921	=item $w = $loop->fork ($callback)
		922
		923	=item $w = $loop->fork_ns ($callback)
		924
745	Call the callback before the event loop is resumed in the child process	925	Call the callback before the event loop is resumed in the child process
746	after a fork.	926	after a fork.
747		927
748	The C<fork_ns> variant doesn't start (activate) the newly created watcher.	928	The C<fork_ns> variant doesn't start (activate) the newly created watcher.
749		929
750	=back	930	=back
751		931
		932
		933	=head3 EMBED WATCHERS - when one backend isn't enough...
		934
		935	This is a rather advanced watcher type that lets you embed one event loop
		936	into another (currently only IO events are supported in the embedded
		937	loop, other types of watchers might be handled in a delayed or incorrect
		938	fashion and must not be used).
		939
		940	See the libev documentation at
		941	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
		942	for more details.
		943
		944	In short, this watcher is most useful on BSD systems without working
		945	kqueue to still be able to handle a large number of sockets:
		946
		947	my $socket_loop;
		948
		949	# check wether we use SELECT or POLL _and_ KQUEUE is supported
		950	if (
		951	(EV::backend & (EV::BACKEND_POLL \| EV::BACKEND_SELECT))
		952	&& (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
		953	) {
		954	# use kqueue for sockets
		955	$socket_loop = new EV::Loop EV::BACKEND_KQUEUE \| EV::FLAG_NOENV;
		956	}
		957
		958	# use the default loop otherwise
		959	$socket_loop \|\|= EV::default_loop;
		960
		961	=over 4
		962
		963	=item $w = EV::embed $otherloop, $callback
		964
		965	=item $w = EV::embed_ns $otherloop, $callback
		966
		967	=item $w = $loop->embed ($otherloop, $callback)
		968
		969	=item $w = $loop->embed_ns ($otherloop, $callback)
		970
		971	Call the callback when the embedded event loop (C<$otherloop>) has any
		972	I/O activity. The C<$callback> should alwas be specified as C<undef> in
		973	this version of EV, which means the embedded event loop will be managed
		974	automatically.
		975
		976	The C<embed_ns> variant doesn't start (activate) the newly created watcher.
		977
		978	=back
		979
		980	=head3 ASYNC WATCHERS - how to wake up another event loop
		981
		982	Async watchers are provided by EV, but have little use in perl directly, as perl
		983	neither supports threads nor direct access to signal handlers or other
		984	contexts where they could be of value.
		985
		986	It is, however, possible to use them from the XS level.
		987
		988	Please see the libev documentation for further details.
		989
		990	=over 4
		991
		992	=item $w = EV::async $callback
		993
		994	=item $w = EV::async_ns $callback
		995
		996	=item $w->send
		997
		998	=item $bool = $w->async_pending
		999
		1000	=back
		1001
		1002
		1003	=head1 PERL SIGNALS
		1004
		1005	While Perl signal handling (C<%SIG>) is not affected by EV, the behaviour
		1006	with EV is as the same as any other C library: Perl-signals will only be
		1007	handled when Perl runs, which means your signal handler might be invoked
		1008	only the next time an event callback is invoked.
		1009
		1010	The solution is to use EV signal watchers (see C<EV::signal>), which will
		1011	ensure proper operations with regards to other event watchers.
		1012
		1013	If you cannot do this for whatever reason, you can also force a watcher
		1014	to be called on every event loop iteration by installing a C<EV::check>
		1015	watcher:
		1016
		1017	my $async_check = EV::check sub { };
		1018
		1019	This ensures that perl gets into control for a short time to handle any
		1020	pending signals, and also ensures (slightly) slower overall operation.
752		1021
753	=head1 THREADS	1022	=head1 THREADS
754		1023
755	Threads are not supported by this module in any way. Perl pseudo-threads	1024	Threads are not supported by this module in any way. Perl pseudo-threads
756	is evil stuff and must die. As soon as Perl gains real threads I will work	1025	is evil stuff and must die. As soon as Perl gains real threads I will work
…		…
778	our $DIED = sub {	1047	our $DIED = sub {
779	warn "EV: error in callback (ignoring): $@";	1048	warn "EV: error in callback (ignoring): $@";
780	};	1049	};
781		1050
782	default_loop	1051	default_loop
783	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?';	1052	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?';
784		1053
785	1;	1054	1;
786		1055
787	=head1 SEE ALSO	1056	=head1 SEE ALSO
788		1057
789	L<EV::ADNS> (asynchronous dns), L<Glib::EV> (makes Glib/Gtk2 use EV as	1058	L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as
790	event loop), L<Coro::EV> (efficient coroutines with EV).	1059	event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient
		1060	coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
		1061	event-loop agnostic and portable event driven programming.
791		1062
792	=head1 AUTHOR	1063	=head1 AUTHOR
793		1064
794	Marc Lehmann <schmorp@schmorp.de>	1065	Marc Lehmann <schmorp@schmorp.de>
795	http://home.schmorp.de/	1066	http://home.schmorp.de/

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Comparing EV/EV.pm (file contents): Revision 1.59 by root, Sat Dec 1 22:51:34 2007 UTC vs. Revision 1.93 by root, Tue May 20 19:52:12 2008 UTC

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Comparing EV/EV.pm (file contents):
Revision 1.59 by root, Sat Dec 1 22:51:34 2007 UTC vs.
Revision 1.93 by root, Tue May 20 19:52:12 2008 UTC