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

Comparing EV/EV.pm (file contents):
Revision 1.61 by root, Thu Dec 6 03:13:07 2007 UTC vs.
Revision 1.94 by root, Tue May 20 23:54:05 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 = '1.6';	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
136	=item $count = EV::loop_count	213	=item $count = EV::loop_count
137		214
		215	=item $count = $loop->loop_count
		216
138	Return the number of times the event loop has polled for new	217	Return the number of times the event loop has polled for new
139	events. Sometiems useful as a generation counter.	218	events. Sometiems useful as a generation counter.
140		219
141	=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))
142		223
143	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
144	one-shot event without the need for managing a watcher object.	225	one-shot event without the need for managing a watcher object.
145		226
146	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>
…		…
152	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
153	timeout. Otherwise a EV::timer with this value will be started.	234	timeout. Otherwise a EV::timer with this value will be started.
154		235
155	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
156	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
157	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>,
158	C<EV::WRITE> and C<EV::TIMEOUT>).	239	C<EV::WRITE> and C<EV::TIMEOUT>).
159		240
160	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
161	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
162	invoked.	243	invoked.
163		244
164	=back	245	=item EV::feed_fd_event ($fd, $revents)
165		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
166	=head2 WATCHER OBJECTS	274	=head1 WATCHER OBJECTS
167		275
168	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
169	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
170	would create an EV::io watcher for that:	278	would create an EV::io watcher for that:
171		279
172	my $watcher = EV::io *STDIN, EV::READ, sub {	280	my $watcher = EV::io *STDIN, EV::READ, sub {
173	my ($watcher, $revents) = @_;	281	my ($watcher, $revents) = @_;
174	warn "yeah, STDIN should not be readable without blocking!\n"	282	warn "yeah, STDIN should now be readable without blocking!\n"
175	};	283	};
176		284
177	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
178	active watchers will have their callbacks invoked. All callbacks will be	286	active watchers will have their callbacks invoked. All callbacks will be
179	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
180	events.	288	events.
181		289
182	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
183	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
184	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,
185	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
186	(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
187	uses EV::TIMEOUT).	295	uses EV::TIMEOUT).
188		296
189	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
190	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
…		…
212		320
213	=item $w->stop	321	=item $w->stop
214		322
215	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
216	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),
217	regardless of wether the watcher was active or not.	325	regardless of whether the watcher was active or not.
218		326
219	=item $bool = $w->is_active	327	=item $bool = $w->is_active
220		328
221	Returns true if the watcher is active, false otherwise.	329	Returns true if the watcher is active, false otherwise.
222		330
…		…
252	The default priority of any newly-created watcher is 0.	360	The default priority of any newly-created watcher is 0.
253		361
254	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
255	subject to almost certain change.	363	subject to almost certain change.
256		364
257	=item $w->trigger ($revents)	365	=item $w->invoke ($revents)
258		366
259	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>.
260		379
261	=item $previous_state = $w->keepalive ($bool)	380	=item $previous_state = $w->keepalive ($bool)
262		381
263	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
264	(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
265	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),
266	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
267	finished (or they forgot to register some watchers for their task :).	386	finished (or they forgot to register some watchers for their task :).
268		387
269	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
270	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
271	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
272	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
273	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
274	because you happen to have this long-running UDP port watcher.	393	because you happen to have this long-running UDP port watcher.
…		…
277	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.
278		397
279	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
280	any time.	399	any time.
281		400
282	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
283	event loop from running just because of that watcher.	402	event loop from running just because of that watcher.
284		403
285	my $udp_socket = ...	404	my $udp_socket = ...
286	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };	405	my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
287	$udp_watcher->keepalive (0);	406	$1000udp_watcher->keepalive (0);
288		407
289	=back	408	=item $loop = $w->loop
290		409
		410	Return the loop that this watcher is attached to.
291		411
		412	=back
		413
		414
292	=head2 WATCHER TYPES	415	=head1 WATCHER TYPES
293		416
294	Each of the following subsections describes a single watcher type.	417	Each of the following subsections describes a single watcher type.
295		418
296	=head3 IO WATCHERS - is this file descriptor readable or writable?	419	=head3 I/O WATCHERS - is this file descriptor readable or writable?
297		420
298	=over 4	421	=over 4
299		422
300	=item $w = EV::io $fileno_or_fh, $eventmask, $callback	423	=item $w = EV::io $fileno_or_fh, $eventmask, $callback
301		424
302	=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, $callback)
303		430
304	As long as the returned watcher object is alive, call the C<$callback>	431	As long as the returned watcher object is alive, call the C<$callback>
305	when at least one of events specified in C<$eventmask> occurs.	432	when at least one of events specified in C<$eventmask> occurs.
306		433
307	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:
…		…
336	=over 4	463	=over 4
337		464
338	=item $w = EV::timer $after, $repeat, $callback	465	=item $w = EV::timer $after, $repeat, $callback
339		466
340	=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, $callback)
341		472
342	Calls the callback after C<$after> seconds (which may be fractional). If	473	Calls the callback after C<$after> seconds (which may be fractional). If
343	C<$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
344	value as $after) after the callback returns.	475	value as $after) after the callback returns.
345		476
…		…
386	=over 4	517	=over 4
387		518
388	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback	519	=item $w = EV::periodic $at, $interval, $reschedule_cb, $callback
389		520
390	=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, $callback)
391		526
392	Similar to EV::timer, but is not based on relative timeouts but on	527	Similar to EV::timer, but is not based on relative timeouts but on
393	absolute times. Apart from creating "simple" timers that trigger "at" the	528	absolute times. Apart from creating "simple" timers that trigger "at" the
394	specified time, it can also be used for non-drifting absolute timers and	529	specified time, it can also be used for non-drifting absolute timers and
395	more complex, cron-like, setups that are not adversely affected by time	530	more complex, cron-like, setups that are not adversely affected by time
…		…
405	This time simply fires at the wallclock time C<$at> and doesn't repeat. It	540	This time simply fires at the wallclock time C<$at> and doesn't repeat. It
406	will not adjust when a time jump occurs, that is, if it is to be run	541	will not adjust when a time jump occurs, that is, if it is to be run
407	at January 1st 2011 then it will run when the system time reaches or	542	at January 1st 2011 then it will run when the system time reaches or
408	surpasses this time.	543	surpasses this time.
409		544
410	=item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0)	545	=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
411		546
412	In this mode the watcher will always be scheduled to time out at the	547	In this mode the watcher will always be scheduled to time out at the
413	next C<$at + N * $interval> time (for some integer N) and then repeat,	548	next C<$at + N * $interval> time (for some integer N) and then repeat,
414	regardless of any time jumps.	549	regardless of any time jumps.
415		550
…		…
433	time the periodic watcher gets scheduled, the reschedule callback	568	time the periodic watcher gets scheduled, the reschedule callback
434	($reschedule_cb) will be called with the watcher as first, and the current	569	($reschedule_cb) will be called with the watcher as first, and the current
435	time as second argument.	570	time as second argument.
436		571
437	I<This callback MUST NOT stop or destroy this or any other periodic	572	I<This callback MUST NOT stop or destroy this or any other periodic
438	watcher, ever>. If you need to stop it, return 1e30 and stop it	573	watcher, ever, and MUST NOT call any event loop functions or methods>. If
439	afterwards.	574	you need to stop it, return 1e30 and stop it afterwards. You may create
		575	and start a C<EV::prepare> watcher for this task.
440		576
441	It must return the next time to trigger, based on the passed time value	577	It must return the next time to trigger, based on the passed time value
442	(that is, the lowest time value larger than to the second argument). It	578	(that is, the lowest time value larger than or equal to to the second
443	will usually be called just before the callback will be triggered, but	579	argument). It will usually be called just before the callback will be
444	might be called at other times, too.	580	triggered, but might be called at other times, too.
445		581
446	This can be used to create very complex timers, such as a timer that	582	This can be used to create very complex timers, such as a timer that
447	triggers on each midnight, local time (actually 24 hours after the last	583	triggers on each midnight, local time (actually 24 hours after the last
448	midnight, to keep the example simple. If you know a way to do it correctly	584	midnight, to keep the example simple. If you know a way to do it correctly
449	in about the same space (without requiring elaborate modules), drop me a	585	in about the same space (without requiring elaborate modules), drop me a
…		…
470		606
471	=item $w->again	607	=item $w->again
472		608
473	Simply stops and starts the watcher again.	609	Simply stops and starts the watcher again.
474		610
		611	=item $time = $w->at
		612
		613	Return the time that the watcher is expected to trigger next.
		614
475	=back	615	=back
476		616
477		617
478	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!	618	=head3 SIGNAL WATCHERS - signal me when a signal gets signalled!
479		619
…		…
512		652
513	=head3 CHILD WATCHERS - watch out for process status changes	653	=head3 CHILD WATCHERS - watch out for process status changes
514		654
515	=over 4	655	=over 4
516		656
517	=item $w = EV::child $pid, $callback	657	=item $w = EV::child $pid, $trace, $callback
518		658
519	=item $w = EV::child_ns $pid, $callback	659	=item $w = EV::child_ns $pid, $trace, $callback
520		660
		661	=item $w = $loop->child ($pid, $trace, $callback)
		662
		663	=item $w = $loop->child_ns ($pid, $trace, $callback)
		664
521	Call the callback when a status change for pid C<$pid> (or any pid if	665	Call the callback when a status change for pid C<$pid> (or any pid
522	C<$pid> is 0) has been received. More precisely: when the process receives	666	if C<$pid> is 0) has been received (a status change happens when the
		667	process terminates or is killed, or, when trace is true, additionally when
		668	it is stopped or continued). More precisely: when the process receives
523	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all	669	a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all
524	changed/zombie children and call the callback.	670	changed/zombie children and call the callback.
525		671
526	It is valid (and fully supported) to install a child watcher after a child	672	It is valid (and fully supported) to install a child watcher after a child
527	has exited but before the event loop has started its next iteration (for	673	has exited but before the event loop has started its next iteration (for
…		…
534	You can have as many pid watchers per pid as you want, they will all be	680	You can have as many pid watchers per pid as you want, they will all be
535	called.	681	called.
536		682
537	The C<child_ns> variant doesn't start (activate) the newly created watcher.	683	The C<child_ns> variant doesn't start (activate) the newly created watcher.
538		684
539	=item $w->set ($pid)	685	=item $w->set ($pid, $trace)
540		686
541	Reconfigures the watcher, see the constructor above for details. Can be called at	687	Reconfigures the watcher, see the constructor above for details. Can be called at
542	any time.	688	any time.
543		689
544	=item $current_pid = $w->pid	690	=item $current_pid = $w->pid
545		691
546	=item $old_pid = $w->pid ($new_pid)
547
548	Returns the previously set process id and optionally set a new one.	692	Returns the previously set process id and optionally set a new one.
549		693
550	=item $exit_status = $w->rstatus	694	=item $exit_status = $w->rstatus
551		695
552	Return the exit/wait status (as returned by waitpid, see the waitpid entry	696	Return the exit/wait status (as returned by waitpid, see the waitpid entry
…		…
565	=over 4	709	=over 4
566		710
567	=item $w = EV::stat $path, $interval, $callback	711	=item $w = EV::stat $path, $interval, $callback
568		712
569	=item $w = EV::stat_ns $path, $interval, $callback	713	=item $w = EV::stat_ns $path, $interval, $callback
		714
		715	=item $w = $loop->stat ($path, $interval, $callback)
		716
		717	=item $w = $loop->stat_ns ($path, $interval, $callback)
570		718
571	Call the callback when a file status change has been detected on	719	Call the callback when a file status change has been detected on
572	C<$path>. The C<$path> does not need to exist, changing from "path exists"	720	C<$path>. The C<$path> does not need to exist, changing from "path exists"
573	to "path does not exist" is a status change like any other.	721	to "path does not exist" is a status change like any other.
574		722
…		…
645		793
646	=item $w = EV::idle $callback	794	=item $w = EV::idle $callback
647		795
648	=item $w = EV::idle_ns $callback	796	=item $w = EV::idle_ns $callback
649		797
650	Call the callback when there are no pending io, timer/periodic, signal or	798	=item $w = $loop->idle ($callback)
651	child events, i.e. when the process is idle.	799
		800	=item $w = $loop->idle_ns ($callback)
		801
		802	Call the callback when there are no other pending watchers of the same or
		803	higher priority (excluding check, prepare and other idle watchers of the
		804	same or lower priority, of course). They are called idle watchers because
		805	when the watcher is the highest priority pending event in the process, the
		806	process is considered to be idle at that priority.
		807
		808	If you want a watcher that is only ever called when I<no> other events are
		809	outstanding you have to set the priority to C<EV::MINPRI>.
652		810
653	The process will not block as long as any idle watchers are active, and	811	The process will not block as long as any idle watchers are active, and
654	they will be called repeatedly until stopped.	812	they will be called repeatedly until stopped.
655		813
		814	For example, if you have idle watchers at priority C<0> and C<1>, and
		815	an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
		816	and the I/O watcher will always run when ready. Only when the idle watcher
		817	at priority C<1> is stopped and the I/O watcher at priority C<0> is not
		818	pending with the C<0>-priority idle watcher be invoked.
		819
656	The C<idle_ns> variant doesn't start (activate) the newly created watcher.	820	The C<idle_ns> variant doesn't start (activate) the newly created watcher.
657		821
658	=back	822	=back
659		823
660		824
…		…
663	=over 4	827	=over 4
664		828
665	=item $w = EV::prepare $callback	829	=item $w = EV::prepare $callback
666		830
667	=item $w = EV::prepare_ns $callback	831	=item $w = EV::prepare_ns $callback
		832
		833	=item $w = $loop->prepare ($callback)
		834
		835	=item $w = $loop->prepare_ns ($callback)
668		836
669	Call the callback just before the process would block. You can still	837	Call the callback just before the process would block. You can still
670	create/modify any watchers at this point.	838	create/modify any watchers at this point.
671		839
672	See the EV::check watcher, below, for explanations and an example.	840	See the EV::check watcher, below, for explanations and an example.
…		…
681	=over 4	849	=over 4
682		850
683	=item $w = EV::check $callback	851	=item $w = EV::check $callback
684		852
685	=item $w = EV::check_ns $callback	853	=item $w = EV::check_ns $callback
		854
		855	=item $w = $loop->check ($callback)
		856
		857	=item $w = $loop->check_ns ($callback)
686		858
687	Call the callback just after the process wakes up again (after it has	859	Call the callback just after the process wakes up again (after it has
688	gathered events), but before any other callbacks have been invoked.	860	gathered events), but before any other callbacks have been invoked.
689		861
690	This is used to integrate other event-based software into the EV	862	This is used to integrate other event-based software into the EV
…		…
700	or return;	872	or return;
701		873
702	# make the dispatcher handle any outstanding stuff	874	# make the dispatcher handle any outstanding stuff
703	... not shown	875	... not shown
704		876
705	# create an IO watcher for each and every socket	877	# create an I/O watcher for each and every socket
706	@snmp_watcher = (	878	@snmp_watcher = (
707	(map { EV::io $_, EV::READ, sub { } }	879	(map { EV::io $_, EV::READ, sub { } }
708	keys %{ $dispatcher->{_descriptors} }),	880	keys %{ $dispatcher->{_descriptors} }),
709		881
710	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]	882	EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
…		…
745		917
746	=item $w = EV::fork $callback	918	=item $w = EV::fork $callback
747		919
748	=item $w = EV::fork_ns $callback	920	=item $w = EV::fork_ns $callback
749		921
		922	=item $w = $loop->fork ($callback)
		923
		924	=item $w = $loop->fork_ns ($callback)
		925
750	Call the callback before the event loop is resumed in the child process	926	Call the callback before the event loop is resumed in the child process
751	after a fork.	927	after a fork.
752		928
753	The C<fork_ns> variant doesn't start (activate) the newly created watcher.	929	The C<fork_ns> variant doesn't start (activate) the newly created watcher.
		930
		931	=back
		932
		933
		934	=head3 EMBED WATCHERS - when one backend isn't enough...
		935
		936	This is a rather advanced watcher type that lets you embed one event loop
		937	into another (currently only IO events are supported in the embedded
		938	loop, other types of watchers might be handled in a delayed or incorrect
		939	fashion and must not be used).
		940
		941	See the libev documentation at
		942	L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
		943	for more details.
		944
		945	In short, this watcher is most useful on BSD systems without working
		946	kqueue to still be able to handle a large number of sockets:
		947
		948	my $socket_loop;
		949
		950	# check wether we use SELECT or POLL _and_ KQUEUE is supported
		951	if (
		952	(EV::backend & (EV::BACKEND_POLL \| EV::BACKEND_SELECT))
		953	&& (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
		954	) {
		955	# use kqueue for sockets
		956	$socket_loop = new EV::Loop EV::BACKEND_KQUEUE \| EV::FLAG_NOENV;
		957	}
		958
		959	# use the default loop otherwise
		960	$socket_loop \|\|= EV::default_loop;
		961
		962	=over 4
		963
		964	=item $w = EV::embed $otherloop, $callback
		965
		966	=item $w = EV::embed_ns $otherloop, $callback
		967
		968	=item $w = $loop->embed ($otherloop, $callback)
		969
		970	=item $w = $loop->embed_ns ($otherloop, $callback)
		971
		972	Call the callback when the embedded event loop (C<$otherloop>) has any
		973	I/O activity. The C<$callback> should alwas be specified as C<undef> in
		974	this version of EV, which means the embedded event loop will be managed
		975	automatically.
		976
		977	The C<embed_ns> variant doesn't start (activate) the newly created watcher.
		978
		979	=back
		980
		981	=head3 ASYNC WATCHERS - how to wake up another event loop
		982
		983	Async watchers are provided by EV, but have little use in perl directly, as perl
		984	neither supports threads nor direct access to signal handlers or other
		985	contexts where they could be of value.
		986
		987	It is, however, possible to use them from the XS level.
		988
		989	Please see the libev documentation for further details.
		990
		991	=over 4
		992
		993	=item $w = EV::async $callback
		994
		995	=item $w = EV::async_ns $callback
		996
		997	=item $w->send
		998
		999	=item $bool = $w->async_pending
754		1000
755	=back	1001	=back
756		1002
757		1003
758	=head1 PERL SIGNALS	1004	=head1 PERL SIGNALS
…		…
769	to be called on every event loop iteration by installing a C<EV::check>	1015	to be called on every event loop iteration by installing a C<EV::check>
770	watcher:	1016	watcher:
771		1017
772	my $async_check = EV::check sub { };	1018	my $async_check = EV::check sub { };
773		1019
774	This ensures that perl shortly gets into control for a short time, and	1020	This ensures that perl gets into control for a short time to handle any
775	also ensures slower overall operation.	1021	pending signals, and also ensures (slightly) slower overall operation.
776		1022
777	=head1 THREADS	1023	=head1 THREADS
778		1024
779	Threads are not supported by this module in any way. Perl pseudo-threads	1025	Threads are not supported by this module in any way. Perl pseudo-threads
780	is evil stuff and must die. As soon as Perl gains real threads I will work	1026	is evil stuff and must die. As soon as Perl gains real threads I will work
…		…
802	our $DIED = sub {	1048	our $DIED = sub {
803	warn "EV: error in callback (ignoring): $@";	1049	warn "EV: error in callback (ignoring): $@";
804	};	1050	};
805		1051
806	default_loop	1052	default_loop
807	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?';	1053	or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?';
808		1054
809	1;	1055	1;
810		1056
811	=head1 SEE ALSO	1057	=head1 SEE ALSO
812		1058
813	L<EV::ADNS> (asynchronous dns), L<Glib::EV> (makes Glib/Gtk2 use EV as	1059	L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as
814	event loop), L<Coro::EV> (efficient coroutines with EV).	1060	event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient
		1061	coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
		1062	event-loop agnostic and portable event driven programming.
815		1063
816	=head1 AUTHOR	1064	=head1 AUTHOR
817		1065
818	Marc Lehmann <schmorp@schmorp.de>	1066	Marc Lehmann <schmorp@schmorp.de>
819	http://home.schmorp.de/	1067	http://home.schmorp.de/

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Comparing EV/EV.pm (file contents): Revision 1.61 by root, Thu Dec 6 03:13:07 2007 UTC vs. Revision 1.94 by root, Tue May 20 23:54:05 2008 UTC

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Comparing EV/EV.pm (file contents):
Revision 1.61 by root, Thu Dec 6 03:13:07 2007 UTC vs.
Revision 1.94 by root, Tue May 20 23:54:05 2008 UTC