ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/EV/README
(Generate patch)

Comparing EV/README (file contents):
Revision 1.4 by root, Mon Oct 29 19:53:21 2007 UTC vs.
Revision 1.9 by root, Mon Nov 12 01:23:21 2007 UTC

1NAME 1NAME
2 EV - perl interface to libevent, monkey.org/~provos/libevent/ 2 EV - perl interface to libev, a high performance full-featured event
3 loop
3 4
4SYNOPSIS 5SYNOPSIS
5 use EV; 6 use EV;
6 7
7 # TIMER 8 # TIMERS
8 9
9 my $w = EV::timer 2, 0, sub { 10 my $w = EV::timer 2, 0, sub {
10 warn "is called after 2s"; 11 warn "is called after 2s";
11 }; 12 };
12 13
13 my $w = EV::timer 2, 1, sub { 14 my $w = EV::timer 2, 2, sub {
14 warn "is called roughly every 2s (repeat = 1)"; 15 warn "is called roughly every 2s (repeat = 2)";
15 }; 16 };
16 17
17 undef $w; # destroy event watcher again 18 undef $w; # destroy event watcher again
18 19
19 my $w = EV::timer_abs 0, 60, sub { 20 my $w = EV::periodic 0, 60, 0, sub {
20 warn "is called every minute, on the minute, exactly"; 21 warn "is called every minute, on the minute, exactly";
21 }; 22 };
22 23
23 # IO 24 # IO
24 25
25 my $w = EV::io \*STDIN, EV::READ | EV::PERSIST, sub { 26 my $w = EV::io *STDIN, EV::READ, sub {
26 my ($w, $events) = @_; # all callbacks get the watcher object and event mask 27 my ($w, $revents) = @_; # all callbacks receive the watcher and event mask
27 if ($events & EV::TIMEOUT) {
28 warn "nothing received on stdin for 10 seconds, retrying";
29 } else {
30 warn "stdin is readable, you entered: ", <STDIN>; 28 warn "stdin is readable, you entered: ", <STDIN>;
31 }
32 };
33 $w->timeout (10);
34
35 my $w = EV::timed_io \*STDIN, EV::READ, 30, sub {
36 my ($w, $events) = @_;
37 if ($_[1] & EV::TIMEOUT) {
38 warn "nothing entered within 30 seconds, bye bye.\n";
39 $w->stop;
40 } else {
41 my $line = <STDIN>;
42 warn "you entered something, you again have 30 seconds.\n";
43 }
44 }; 29 };
45 30
46 # SIGNALS 31 # SIGNALS
47 32
48 my $w = EV::signal 'QUIT', sub { 33 my $w = EV::signal 'QUIT', sub {
49 warn "sigquit received\n"; 34 warn "sigquit received\n";
50 }; 35 };
51 36
37 # CHILD/PID STATUS CHANGES
38
52 my $w = EV::signal 3, sub { 39 my $w = EV::child 666, sub {
53 warn "sigquit received (this is GNU/Linux, right?)\n"; 40 my ($w, $revents) = @_;
41 my $status = $w->rstatus;
54 }; 42 };
55 43
56 # MAINLOOP 44 # MAINLOOP
57 EV::dispatch; # loop as long as watchers are active 45 EV::loop; # loop until EV::loop_done is called or all watchers stop
58 EV::loop; # the same thing
59 EV::loop EV::LOOP_ONCE; # block until some events could be handles 46 EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled
60 EV::loop EV::LOOP_NONBLOCK; # check and handle some events, but do not wait 47 EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
61 48
62DESCRIPTION 49DESCRIPTION
63 This module provides an interface to libevent 50 This module provides an interface to libev
64 (<http://monkey.org/~provos/libevent/>). You probably should acquaint 51 (<http://software.schmorp.de/pkg/libev.html>).
65 yourself with its documentation and source code to be able to use this
66 module fully.
67
68 Please note thta this module disables the libevent EPOLL method by
69 default, see BUGS, below, if you need to enable it.
70 52
71BASIC INTERFACE 53BASIC INTERFACE
72 $EV::NPRI
73 How many priority levels are available.
74
75 $EV::DIED 54 $EV::DIED
76 Must contain a reference to a function that is called when a 55 Must contain a reference to a function that is called when a
77 callback throws an exception (with $@ containing thr error). The 56 callback throws an exception (with $@ containing thr error). The
78 default prints an informative message and continues. 57 default prints an informative message and continues.
79 58
80 If this callback throws an exception it will be silently ignored. 59 If this callback throws an exception it will be silently ignored.
81 60
61 $time = EV::time
62 Returns the current time in (fractional) seconds since the epoch.
63
82 $time = EV::now 64 $time = EV::now
83 Returns the time in (fractional) seconds since the epoch. 65 Returns the time the last event loop iteration has been started.
66 This is the time that (relative) timers are based on, and refering
67 to it is usually faster then calling EV::time.
84 68
85 $version = EV::version
86 $method = EV::method 69 $method = EV::ev_method
87 Return version string and event polling method used. 70 Returns an integer describing the backend used by libev
71 (EV::METHOD_SELECT or EV::METHOD_EPOLL).
88 72
89 EV::loop $flags # EV::LOOP_ONCE, EV::LOOP_ONESHOT 73 EV::loop [$flags]
90 EV::loopexit $after 74 Begin checking for events and calling callbacks. It returns when a
91 Exit any active loop or dispatch after $after seconds or immediately 75 callback calls EV::loop_done.
92 if $after is missing or zero.
93 76
94 EV::dispatch 77 The $flags argument can be one of the following:
95 Same as "EV::loop 0".
96 78
97 EV::event $callback 79 0 as above
98 Creates a new event watcher waiting for nothing, calling the given 80 EV::LOOP_ONESHOT block at most once (wait, but do not loop)
99 callback. 81 EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait)
100 82
83 EV::loop_done [$how]
84 When called with no arguments or an argument of 1, makes the
85 innermost call to EV::loop return.
86
87 When called with an agrument of 2, all calls to EV::loop will return
88 as fast as possible.
89
90 WATCHER
91 A watcher is an object that gets created to record your interest in some
92 event. For instance, if you want to wait for STDIN to become readable,
93 you would create an EV::io watcher for that:
94
95 my $watcher = EV::io *STDIN, EV::READ, sub {
96 my ($watcher, $revents) = @_;
97 warn "yeah, STDIN should not be readable without blocking!\n"
98 };
99
100 All watchers can be active (waiting for events) or inactive (paused).
101 Only active watchers will have their callbacks invoked. All callbacks
102 will be called with at least two arguments: the watcher and a bitmask of
103 received events.
104
105 Each watcher type has its associated bit in revents, so you can use the
106 same callback for multiple watchers. The event mask is named after the
107 type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
108 EV::periodic sets EV::PERIODIC and so on, with the exception of IO
109 events (which can set both EV::READ and EV::WRITE bits), and EV::timer
110 (which uses EV::TIMEOUT).
111
112 In the rare case where one wants to create a watcher but not start it at
113 the same time, each constructor has a variant with a trailing "_ns" in
114 its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
115
116 Please note that a watcher will automatically be stopped when the
117 watcher object is destroyed, so you *need* to keep the watcher objects
118 returned by the constructors.
119
120 Also, all methods changing some aspect of a watcher (->set, ->priority,
121 ->fh and so on) automatically stop and start it again if it is active,
122 which means pending events get lost.
123
124 WATCHER TYPES
125 Now lets move to the existing watcher types and asociated methods.
126
127 The following methods are available for all watchers. Then followes a
128 description of each watcher constructor (EV::io, EV::timer,
129 EV::periodic, EV::signal, EV::child, EV::idle, EV::prepare and
130 EV::check), followed by any type-specific methods (if any).
131
132 $w->start
133 Starts a watcher if it isn't active already. Does nothing to an
134 already active watcher. By default, all watchers start out in the
135 active state (see the description of the "_ns" variants if you need
136 stopped watchers).
137
138 $w->stop
139 Stop a watcher if it is active. Also clear any pending events
140 (events that have been received but that didn't yet result in a
141 callback invocation), regardless of wether the watcher was active or
142 not.
143
144 $bool = $w->is_active
145 Returns true if the watcher is active, false otherwise.
146
147 $current_data = $w->data
148 $old_data = $w->data ($new_data)
149 Queries a freely usable data scalar on the watcher and optionally
150 changes it. This is a way to associate custom data with a watcher:
151
152 my $w = EV::timer 60, 0, sub {
153 warn $_[0]->data;
154 };
155 $w->data ("print me!");
156
157 $current_cb = $w->cb
158 $old_cb = $w->cb ($new_cb)
159 Queries the callback on the watcher and optionally changes it. You
160 can do this at any time without the watcher restarting.
161
162 $current_priority = $w->priority
163 $old_priority = $w->priority ($new_priority)
164 Queries the priority on the watcher and optionally changes it.
165 Pending watchers with higher priority will be invoked first. The
166 valid range of priorities lies between EV::MAXPRI (default 2) and
167 EV::MINPRI (default -2). If the priority is outside this range it
168 will automatically be normalised to the nearest valid priority.
169
170 The default priority of any newly-created weatcher is 0.
171
172 $w->trigger ($revents)
173 Call the callback *now* with the given event mask.
174
101 my $w = EV::io $fileno_or_fh, $eventmask, $callback 175 $w = EV::io $fileno_or_fh, $eventmask, $callback
102 my $w = EV::io_ns $fileno_or_fh, $eventmask, $callback 176 $w = EV::io_ns $fileno_or_fh, $eventmask, $callback
103 As long as the returned watcher object is alive, call the $callback 177 As long as the returned watcher object is alive, call the $callback
104 when the events specified in $eventmask happen. Initially, the 178 when the events specified in $eventmask.
105 timeout is disabled.
106 179
107 You can additionall set a timeout to occur on the watcher, but note
108 that this timeout will not be reset when you get an I/O event in the
109 EV::PERSIST case, and reaching a timeout will always stop the
110 watcher even in the EV::PERSIST case.
111
112 If you want a timeout to occur only after a specific time of
113 inactivity, set a repeating timeout and do NOT use EV::PERSIST.
114
115 Eventmask can be one or more of these constants ORed together: 180 The $eventmask can be one or more of these constants ORed together:
116 181
117 EV::READ wait until read() wouldn't block anymore 182 EV::READ wait until read() wouldn't block anymore
118 EV::WRITE wait until write() wouldn't block anymore 183 EV::WRITE wait until write() wouldn't block anymore
119 EV::PERSIST stay active after a (non-timeout) event occured
120 184
121 The "io_ns" variant doesn't add/start the newly created watcher. 185 The "io_ns" variant doesn't start (activate) the newly created
122
123 my $w = EV::timed_io $fileno_or_fh, $eventmask, $timeout, $callback
124 my $w = EV::timed_io_ns $fileno_or_fh, $eventmask, $timeout, $callback
125 Same as "io" and "io_ns", but also specifies a timeout (as if there
126 was a call to "$w->timeout ($timout, 1)". The persist flag is not
127 allowed and will automatically be cleared. The watcher will be
128 restarted after each event.
129
130 If the timeout is zero or undef, no timeout will be set, and a
131 normal watcher (with the persist flag set!) will be created.
132
133 This has the effect of timing out after the specified period of
134 inactivity has happened.
135
136 Due to the design of libevent, this is also relatively inefficient,
137 having one or two io watchers and a separate timeout watcher that
138 you reset on activity (by calling its "start" method) is usually
139 more efficient.
140
141 my $w = EV::timer $after, $repeat, $callback
142 my $w = EV::timer_ns $after, $repeat, $callback
143 Calls the callback after $after seconds. If $repeat is true, the
144 timer will be restarted after the callback returns. This means that
145 the callback would be called roughly every $after seconds, prolonged
146 by the time the callback takes.
147
148 The "timer_ns" variant doesn't add/start the newly created watcher.
149
150 my $w = EV::timer_abs $at, $interval, $callback
151 my $w = EV::timer_abs_ns $at, $interval, $callback
152 Similar to EV::timer, but the time is given as an absolute point in
153 time ($at), plus an optional $interval.
154
155 If the $interval is zero, then the callback will be called at the
156 time $at if that is in the future, or as soon as possible if its in
157 the past. It will not automatically repeat.
158
159 If the $interval is nonzero, then the watcher will always be
160 scheduled to time out at the next "$at + integer * $interval" time.
161
162 This can be used to schedule a callback to run at very regular
163 intervals, as long as the processing time is less then the interval
164 (otherwise obviously events will be skipped).
165
166 Another way to think about it (for the mathematically inclined) is
167 that "timer_abs" will try to tun the callback at the next possible
168 time where "$time = $at (mod $interval)", regardless of any time
169 jumps.
170
171 The "timer_abs_ns" variant doesn't add/start the newly created
172 watcher. 186 watcher.
173 187
174 my $w = EV::signal $signal, $callback 188 $w->set ($fileno_or_fh, $eventmask)
175 my $w = EV::signal_ns $signal, $callback 189 Reconfigures the watcher, see the constructor above for details. Can
176 Call the callback when $signal is received (the signal can be 190 be called at any time.
177 specified by number or by name, just as with kill or %SIG). Signal
178 watchers are persistent no natter what.
179
180 EV will grab the signal for the process (the kernel only allows one
181 component to receive signals) when you start a signal watcher, and
182 removes it again when you stop it. Pelr does the same when you
183 add/remove callbacks to %SIG, so watch out.
184
185 Unfortunately, only one handler can be registered per signal. Screw
186 libevent.
187
188 The "signal_ns" variant doesn't add/start the newly created watcher.
189
190THE EV::Event CLASS
191 All EV functions creating an event watcher (designated by "my $w ="
192 above) support the following methods on the returned watcher object:
193
194 $w->add ($timeout)
195 Stops and (re-)starts the event watcher, setting the optional
196 timeout to the given value, or clearing the timeout if none is
197 given.
198
199 $w->start
200 Stops and (re-)starts the event watcher without touching the
201 timeout.
202
203 $w->del
204 $w->stop
205 Stop the event watcher if it was started.
206
207 $current_callback = $w->cb
208 $old_callback = $w->cb ($new_callback)
209 Return the previously set callback and optionally set a new one.
210 191
211 $current_fh = $w->fh 192 $current_fh = $w->fh
212 $old_fh = $w->fh ($new_fh) 193 $old_fh = $w->fh ($new_fh)
213 Returns the previously set filehandle and optionally set a new one 194 Returns the previously set filehandle and optionally set a new one.
214 (also clears the EV::SIGNAL flag when setting a filehandle).
215
216 $current_signal = $w->signal
217 $old_signal = $w->signal ($new_signal)
218 Returns the previously set signal number and optionally set a new
219 one (also sets the EV::SIGNAL flag when setting a signal).
220 195
221 $current_eventmask = $w->events 196 $current_eventmask = $w->events
222 $old_eventmask = $w->events ($new_eventmask) 197 $old_eventmask = $w->events ($new_eventmask)
223 Returns the previously set event mask and optionally set a new one. 198 Returns the previously set event mask and optionally set a new one.
224 199
200 $w = EV::timer $after, $repeat, $callback
201 $w = EV::timer_ns $after, $repeat, $callback
202 Calls the callback after $after seconds. If $repeat is non-zero, the
203 timer will be restarted (with the $repeat value as $after) after the
204 callback returns.
205
206 This means that the callback would be called roughly after $after
207 seconds, and then every $repeat seconds. "Roughly" because the time
208 of callback processing is not taken into account, so the timer will
209 slowly drift. If that isn't acceptable, look at EV::periodic.
210
211 The timer is based on a monotonic clock, that is if somebody is
212 sitting in front of the machine while the timer is running and
213 changes the system clock, the timer will nevertheless run (roughly)
214 the same time.
215
216 The "timer_ns" variant doesn't start (activate) the newly created
217 watcher.
218
225 $w->timeout ($after, $repeat) 219 $w->set ($after, $repeat)
226 Resets the timeout (see "EV::timer" for details). 220 Reconfigures the watcher, see the constructor above for details. Can
221 be at any time.
227 222
228 $w->timeout_abs ($at, $interval) 223 $w->again
229 Resets the timeout (see "EV::timer_abs" for details). 224 Similar to the "start" method, but has special semantics for
225 repeating timers:
230 226
231 $w->priority_set ($priority) 227 If the timer is active and repeating, reset the timeout to occur
232 Set the priority of the watcher to $priority (0 <= $priority < 228 $repeat seconds after now.
233 $EV::NPRI).
234 229
235BUGS 230 If the timer is active and non-repeating, it will be stopped.
236 Lots. Libevent itself isn't well tested and rather buggy, and this
237 module is quite new at the moment.
238 231
239 Please note that the epoll method is not, in general, reliable in 232 If the timer is in active and repeating, start it.
240 programs that use fork (even if no libveent calls are being made in the
241 forked process). If your program behaves erratically, try setting the
242 environment variable "EVENT_NOEPOLL" first when running the program.
243 233
244 In general, if you fork, then you can only use the EV module in one of 234 Otherwise do nothing.
245 the children. 235
236 This behaviour is useful when you have a timeout for some IO
237 operation. You create a timer object with the same value for $after
238 and $repeat, and then, in the read/write watcher, run the "again"
239 method on the timeout.
240
241 $w = EV::periodic $at, $interval, $reschedule_cb, $callback
242 $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback
243 Similar to EV::timer, but is not based on relative timeouts but on
244 absolute times. Apart from creating "simple" timers that trigger
245 "at" the specified time, it can also be used for non-drifting
246 absolute timers and more complex, cron-like, setups that are not
247 adversely affected by time jumps (i.e. when the system clock is
248 changed by explicit date -s or other means such as ntpd). It is also
249 the most complex watcher type in EV.
250
251 It has three distinct "modes":
252
253 * absolute timer ($interval = $reschedule_cb = 0)
254 This time simply fires at the wallclock time $at and doesn't
255 repeat. It will not adjust when a time jump occurs, that is, if
256 it is to be run at January 1st 2011 then it will run when the
257 system time reaches or surpasses this time.
258
259 * non-repeating interval timer ($interval > 0, $reschedule_cb = 0)
260 In this mode the watcher will always be scheduled to time out at
261 the next "$at + N * $interval" time (for some integer N) and
262 then repeat, regardless of any time jumps.
263
264 This can be used to create timers that do not drift with respect
265 to system time:
266
267 my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" };
268
269 That doesn't mean there will always be 3600 seconds in between
270 triggers, but only that the the clalback will be called when the
271 system time shows a full hour (UTC).
272
273 Another way to think about it (for the mathematically inclined)
274 is that EV::periodic will try to run the callback in this mode
275 at the next possible time where "$time = $at (mod $interval)",
276 regardless of any time jumps.
277
278 * manual reschedule mode ($reschedule_cb = coderef)
279 In this mode $interval and $at are both being ignored. Instead,
280 each time the periodic watcher gets scheduled, the first
281 callback ($reschedule_cb) will be called with the watcher as
282 first, and the current time as second argument.
283
284 *This callback MUST NOT stop or destroy this or any other
285 periodic watcher, ever*. If you need to stop it, return 1e30 and
286 stop it afterwards.
287
288 It must return the next time to trigger, based on the passed
289 time value (that is, the lowest time value larger than to the
290 second argument). It will usually be called just before the
291 callback will be triggered, but might be called at other times,
292 too.
293
294 This can be used to create very complex timers, such as a timer
295 that triggers on each midnight, local time (actually 24 hours
296 after the last midnight, to keep the example simple. If you know
297 a way to do it correctly in about the same space (without
298 requiring elaborate modules), drop me a note :):
299
300 my $daily = EV::periodic 0, 0, sub {
301 my ($w, $now) = @_;
302
303 use Time::Local ();
304 my (undef, undef, undef, $d, $m, $y) = localtime $now;
305 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y
306 }, sub {
307 print "it's midnight or likely shortly after, now\n";
308 };
309
310 The "periodic_ns" variant doesn't start (activate) the newly created
311 watcher.
312
313 $w->set ($at, $interval, $reschedule_cb)
314 Reconfigures the watcher, see the constructor above for details. Can
315 be at any time.
316
317 $w->again
318 Simply stops and starts the watcher again.
319
320 $w = EV::signal $signal, $callback
321 $w = EV::signal_ns $signal, $callback
322 Call the callback when $signal is received (the signal can be
323 specified by number or by name, just as with kill or %SIG).
324
325 EV will grab the signal for the process (the kernel only allows one
326 component to receive a signal at a time) when you start a signal
327 watcher, and removes it again when you stop it. Perl does the same
328 when you add/remove callbacks to %SIG, so watch out.
329
330 You can have as many signal watchers per signal as you want.
331
332 The "signal_ns" variant doesn't start (activate) the newly created
333 watcher.
334
335 $w->set ($signal)
336 Reconfigures the watcher, see the constructor above for details. Can
337 be at any time.
338
339 $current_signum = $w->signal
340 $old_signum = $w->signal ($new_signal)
341 Returns the previously set signal (always as a number not name) and
342 optionally set a new one.
343
344 $w = EV::child $pid, $callback
345 $w = EV::child_ns $pid, $callback
346 Call the callback when a status change for pid $pid (or any pid if
347 $pid is 0) has been received. More precisely: when the process
348 receives a SIGCHLD, EV will fetch the outstanding exit/wait status
349 for all changed/zombie children and call the callback.
350
351 You can access both status and pid by using the "rstatus" and "rpid"
352 methods on the watcher object.
353
354 You can have as many pid watchers per pid as you want.
355
356 The "child_ns" variant doesn't start (activate) the newly created
357 watcher.
358
359 $w->set ($pid)
360 Reconfigures the watcher, see the constructor above for details. Can
361 be at any time.
362
363 $current_pid = $w->pid
364 $old_pid = $w->pid ($new_pid)
365 Returns the previously set process id and optionally set a new one.
366
367 $exit_status = $w->rstatus
368 Return the exit/wait status (as returned by waitpid, see the waitpid
369 entry in perlfunc).
370
371 $pid = $w->rpid
372 Return the pid of the awaited child (useful when you have installed
373 a watcher for all pids).
374
375 $w = EV::idle $callback
376 $w = EV::idle_ns $callback
377 Call the callback when there are no pending io, timer/periodic,
378 signal or child events, i.e. when the process is idle.
379
380 The process will not block as long as any idle watchers are active,
381 and they will be called repeatedly until stopped.
382
383 The "idle_ns" variant doesn't start (activate) the newly created
384 watcher.
385
386 $w = EV::prepare $callback
387 $w = EV::prepare_ns $callback
388 Call the callback just before the process would block. You can still
389 create/modify any watchers at this point.
390
391 See the EV::check watcher, below, for explanations and an example.
392
393 The "prepare_ns" variant doesn't start (activate) the newly created
394 watcher.
395
396 $w = EV::check $callback
397 $w = EV::check_ns $callback
398 Call the callback just after the process wakes up again (after it
399 has gathered events), but before any other callbacks have been
400 invoked.
401
402 This is used to integrate other event-based software into the EV
403 mainloop: You register a prepare callback and in there, you create
404 io and timer watchers as required by the other software. Here is a
405 real-world example of integrating Net::SNMP (with some details left
406 out):
407
408 our @snmp_watcher;
409
410 our $snmp_prepare = EV::prepare sub {
411 # do nothing unless active
412 $dispatcher->{_event_queue_h}
413 or return;
414
415 # make the dispatcher handle any outstanding stuff
416
417 # create an IO watcher for each and every socket
418 @snmp_watcher = (
419 (map { EV::io $_, EV::READ, sub { } }
420 keys %{ $dispatcher->{_descriptors} }),
421 );
422
423 # if there are any timeouts, also create a timer
424 push @snmp_watcher, EV::timer $event->[Net::SNMP::Dispatcher::_TIME] - EV::now, 0, sub { }
425 if $event->[Net::SNMP::Dispatcher::_ACTIVE];
426 };
427
428 The callbacks are irrelevant, the only purpose of those watchers is
429 to wake up the process as soon as one of those events occurs (socket
430 readable, or timer timed out). The corresponding EV::check watcher
431 will then clean up:
432
433 our $snmp_check = EV::check sub {
434 # destroy all watchers
435 @snmp_watcher = ();
436
437 # make the dispatcher handle any new stuff
438 };
439
440 The callbacks of the created watchers will not be called as the
441 watchers are destroyed before this cna happen (remember EV::check
442 gets called first).
443
444 The "check_ns" variant doesn't start (activate) the newly created
445 watcher.
446
447THREADS
448 Threads are not supported by this in any way. Perl pseudo-threads is
449 evil stuff and must die.
246 450
247SEE ALSO 451SEE ALSO
248 L<EV::DNS>, L<event(3)>, L<event.h>, L<evdns.h>.
249 L<EV::AnyEvent>. 452 L<EV::DNS>, L<EV::AnyEvent>.
250 453
251AUTHOR 454AUTHOR
252 Marc Lehmann <schmorp@schmorp.de> 455 Marc Lehmann <schmorp@schmorp.de>
253 http://home.schmorp.de/ 456 http://home.schmorp.de/
254 457

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines