… | |
… | |
46 | my ($w, $revents) = @_; |
46 | my ($w, $revents) = @_; |
47 | warn $w->path, " has changed somehow.\n"; |
47 | warn $w->path, " has changed somehow.\n"; |
48 | }; |
48 | }; |
49 | |
49 | |
50 | # MAINLOOP |
50 | # MAINLOOP |
51 | EV::loop; # loop until EV::unloop is called or all watchers stop |
51 | EV::run; # loop until EV::break is called or all watchers stop |
52 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
52 | EV::run EV::RUN_ONCE; # block until at least one event could be handled |
53 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
53 | EV::run EV::RUN_NOWAIT; # try to handle same events, but do not block |
54 | |
54 | |
55 | BEFORE YOU START USING THIS MODULE |
55 | BEFORE YOU START USING THIS MODULE |
56 | If you only need timer, I/O, signal, child and idle watchers and not the |
56 | If you only need timer, I/O, signal, child and idle watchers and not the |
57 | advanced functionality of this module, consider using AnyEvent instead, |
57 | advanced functionality of this module, consider using AnyEvent instead, |
58 | specifically the simplified API described in AE. |
58 | specifically the simplified API described in AE. |
… | |
… | |
75 | can use it through the AnyEvent module, stay portable to other event |
75 | can use it through the AnyEvent module, stay portable to other event |
76 | loops (if you don't rely on any watcher types not available through it) |
76 | loops (if you don't rely on any watcher types not available through it) |
77 | and still be faster than with any other event loop currently supported |
77 | and still be faster than with any other event loop currently supported |
78 | in Perl. |
78 | in Perl. |
79 | |
79 | |
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80 | PORTING FROM EV 3.X to 4.X |
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81 | EV version 4 introduces a number of incompatible changes summarised |
|
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82 | here. According to the depreciation strategy used by libev, there is a |
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83 | compatibility layer in place so programs should continue to run |
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84 | unchanged (the XS interface lacks this layer, so programs using that one |
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85 | need to be updated). |
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86 | |
|
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87 | This compatibility layer will be switched off in some future release. |
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88 | |
|
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89 | All changes relevant to Perl are renames of symbols, functions and |
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90 | methods: |
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91 | |
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92 | EV::loop => EV::run |
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93 | EV::LOOP_NONBLOCK => EV::RUN_NOWAIT |
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94 | EV::LOOP_ONESHOT => EV::RUN_ONCE |
|
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95 | |
|
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96 | EV::unloop => EV::break |
|
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97 | EV::UNLOOP_CANCEL => EV::BREAK_CANCEL |
|
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98 | EV::UNLOOP_ONE => EV::BREAK_ONE |
|
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99 | EV::UNLOOP_ALL => EV::BREAK_ALL |
|
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100 | |
|
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101 | EV::TIMEOUT => EV::TIMER |
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102 | |
|
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103 | EV::loop_count => EV::iteration |
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104 | EV::loop_depth => EV::depth |
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105 | EV::loop_verify => EV::verify |
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106 | |
|
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107 | The loop object methods corresponding to the functions above have been |
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108 | similarly renamed. |
|
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109 | |
80 | MODULE EXPORTS |
110 | MODULE EXPORTS |
81 | This module does not export any symbols. |
111 | This module does not export any symbols. |
82 | |
112 | |
83 | EVENT LOOPS |
113 | EVENT LOOPS |
84 | EV supports multiple event loops: There is a single "default event loop" |
114 | EV supports multiple event loops: There is a single "default event loop" |
… | |
… | |
121 | Must be called after a fork in the child, before entering or |
151 | Must be called after a fork in the child, before entering or |
122 | continuing the event loop. An alternative is to use |
152 | continuing the event loop. An alternative is to use |
123 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
153 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
124 | some performance loss (refer to the libev documentation). |
154 | some performance loss (refer to the libev documentation). |
125 | |
155 | |
126 | $loop->loop_verify |
156 | $loop->verify |
127 | Calls "ev_verify" to make internal consistency checks (for debugging |
157 | Calls "ev_verify" to make internal consistency checks (for debugging |
128 | libev) and abort the program if any data structures were found to be |
158 | libev) and abort the program if any data structures were found to be |
129 | corrupted. |
159 | corrupted. |
130 | |
160 | |
131 | $loop = EV::default_loop [$flags] |
161 | $loop = EV::default_loop [$flags] |
… | |
… | |
165 | |
195 | |
166 | EV::now_update |
196 | EV::now_update |
167 | $loop->now_update |
197 | $loop->now_update |
168 | Establishes the current time by querying the kernel, updating the |
198 | Establishes the current time by querying the kernel, updating the |
169 | time returned by "EV::now" in the progress. This is a costly |
199 | time returned by "EV::now" in the progress. This is a costly |
170 | operation and is usually done automatically within "EV::loop". |
200 | operation and is usually done automatically within "EV::run". |
171 | |
201 | |
172 | This function is rarely useful, but when some event callback runs |
202 | This function is rarely useful, but when some event callback runs |
173 | for a very long time without entering the event loop, updating |
203 | for a very long time without entering the event loop, updating |
174 | libev's idea of the current time is a good idea. |
204 | libev's idea of the current time is a good idea. |
175 | |
205 | |
… | |
… | |
203 | $backend = EV::backend |
233 | $backend = EV::backend |
204 | $backend = $loop->backend |
234 | $backend = $loop->backend |
205 | Returns an integer describing the backend used by libev |
235 | Returns an integer describing the backend used by libev |
206 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
236 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
207 | |
237 | |
208 | EV::loop [$flags] |
238 | $active = EV::run [$flags] |
209 | $loop->loop ([$flags]) |
239 | $active = $loop->run ([$flags]) |
210 | Begin checking for events and calling callbacks. It returns when a |
240 | Begin checking for events and calling callbacks. It returns when a |
211 | callback calls EV::unloop. |
241 | callback calls EV::break or the flags are nonzero (in which case the |
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242 | return value is true) or when there are no active watchers which |
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243 | reference the loop (keepalive is true), in which case the return |
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244 | value will be false. The return value can generally be interpreted |
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245 | as "if true, there is more work left to do". |
212 | |
246 | |
213 | The $flags argument can be one of the following: |
247 | The $flags argument can be one of the following: |
214 | |
248 | |
215 | 0 as above |
249 | 0 as above |
216 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
250 | EV::RUN_ONCE block at most once (wait, but do not loop) |
217 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
251 | EV::RUN_NOWAIT do not block at all (fetch/handle events but do not wait) |
218 | |
252 | |
219 | EV::unloop [$how] |
253 | EV::break [$how] |
220 | $loop->unloop ([$how]) |
254 | $loop->break ([$how]) |
221 | When called with no arguments or an argument of EV::UNLOOP_ONE, |
255 | When called with no arguments or an argument of EV::BREAK_ONE, makes |
222 | makes the innermost call to EV::loop return. |
256 | the innermost call to EV::run return. |
223 | |
257 | |
224 | When called with an argument of EV::UNLOOP_ALL, all calls to |
258 | When called with an argument of EV::BREAK_ALL, all calls to EV::run |
225 | EV::loop will return as fast as possible. |
259 | will return as fast as possible. |
226 | |
260 | |
227 | $count = EV::loop_count |
261 | When called with an argument of EV::BREAK_CANCEL, any pending break |
228 | $count = $loop->loop_count |
262 | will be cancelled. |
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263 | |
|
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264 | $count = EV::iteration |
|
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265 | $count = $loop->iteration |
229 | Return the number of times the event loop has polled for new events. |
266 | Return the number of times the event loop has polled for new events. |
230 | Sometimes useful as a generation counter. |
267 | Sometimes useful as a generation counter. |
231 | |
268 | |
232 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
269 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
233 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
270 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
… | |
… | |
239 | "EV::READ | EV::WRITE", indicating the type of I/O event you want to |
276 | "EV::READ | EV::WRITE", indicating the type of I/O event you want to |
240 | wait for. If you do not want to wait for some I/O event, specify |
277 | wait for. If you do not want to wait for some I/O event, specify |
241 | "undef" for $fh_or_undef and 0 for $events). |
278 | "undef" for $fh_or_undef and 0 for $events). |
242 | |
279 | |
243 | If timeout is "undef" or negative, then there will be no timeout. |
280 | If timeout is "undef" or negative, then there will be no timeout. |
244 | Otherwise a EV::timer with this value will be started. |
281 | Otherwise an "EV::timer" with this value will be started. |
245 | |
282 | |
246 | When an error occurs or either the timeout or I/O watcher triggers, |
283 | When an error occurs or either the timeout or I/O watcher triggers, |
247 | then the callback will be called with the received event set (in |
284 | then the callback will be called with the received event set (in |
248 | general you can expect it to be a combination of "EV::ERROR", |
285 | general you can expect it to be a combination of "EV::ERROR", |
249 | "EV::READ", "EV::WRITE" and "EV::TIMER"). |
286 | "EV::READ", "EV::WRITE" and "EV::TIMER"). |
250 | |
287 | |
251 | EV::once doesn't return anything: the watchers stay active till |
288 | EV::once doesn't return anything: the watchers stay active till |
252 | either of them triggers, then they will be stopped and freed, and |
289 | either of them triggers, then they will be stopped and freed, and |
253 | the callback invoked. |
290 | the callback invoked. |
254 | |
291 | |
255 | EV::feed_fd_event ($fd, $revents) |
292 | EV::feed_fd_event $fd, $revents |
256 | $loop->feed_fd_event ($fd, $revents) |
293 | $loop->feed_fd_event ($fd, $revents) |
257 | Feed an event on a file descriptor into EV. EV will react to this |
294 | Feed an event on a file descriptor into EV. EV will react to this |
258 | call as if the readyness notifications specified by $revents (a |
295 | call as if the readyness notifications specified by $revents (a |
259 | combination of "EV::READ" and "EV::WRITE") happened on the file |
296 | combination of "EV::READ" and "EV::WRITE") happened on the file |
260 | descriptor $fd. |
297 | descriptor $fd. |
261 | |
298 | |
262 | EV::feed_signal_event ($signal) |
299 | EV::feed_signal_event $signal |
263 | Feed a signal event into EV. EV will react to this call as if the |
300 | Feed a signal event into the default loop. EV will react to this |
264 | signal specified by $signal had occured. |
301 | call as if the signal specified by $signal had occured. |
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302 | |
|
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303 | EV::feed_signal $signal |
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304 | Feed a signal event into EV - unlike "EV::feed_signal_event", this |
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305 | works regardless of which loop has registered the signal, and is |
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306 | mainly useful for custom signal implementations. |
265 | |
307 | |
266 | EV::set_io_collect_interval $time |
308 | EV::set_io_collect_interval $time |
267 | $loop->set_io_collect_interval ($time) |
309 | $loop->set_io_collect_interval ($time) |
268 | EV::set_timeout_collect_interval $time |
310 | EV::set_timeout_collect_interval $time |
269 | $loop->set_timeout_collect_interval ($time) |
311 | $loop->set_timeout_collect_interval ($time) |
… | |
… | |
372 | If the watcher is pending, this function clears its pending status |
414 | If the watcher is pending, this function clears its pending status |
373 | and returns its $revents bitset (as if its callback was invoked). If |
415 | and returns its $revents bitset (as if its callback was invoked). If |
374 | the watcher isn't pending it does nothing and returns 0. |
416 | the watcher isn't pending it does nothing and returns 0. |
375 | |
417 | |
376 | $previous_state = $w->keepalive ($bool) |
418 | $previous_state = $w->keepalive ($bool) |
377 | Normally, "EV::loop" will return when there are no active watchers |
419 | Normally, "EV::run" will return when there are no active watchers |
378 | (which is a "deadlock" because no progress can be made anymore). |
420 | (which is a "deadlock" because no progress can be made anymore). |
379 | This is convenient because it allows you to start your watchers (and |
421 | This is convenient because it allows you to start your watchers (and |
380 | your jobs), call "EV::loop" once and when it returns you know that |
422 | your jobs), call "EV::run" once and when it returns you know that |
381 | all your jobs are finished (or they forgot to register some watchers |
423 | all your jobs are finished (or they forgot to register some watchers |
382 | for their task :). |
424 | for their task :). |
383 | |
425 | |
384 | Sometimes, however, this gets in your way, for example when the |
426 | Sometimes, however, this gets in your way, for example when the |
385 | module that calls "EV::loop" (usually the main program) is not the |
427 | module that calls "EV::run" (usually the main program) is not the |
386 | same module as a long-living watcher (for example a DNS client |
428 | same module as a long-living watcher (for example a DNS client |
387 | module written by somebody else even). Then you might want any |
429 | module written by somebody else even). Then you might want any |
388 | outstanding requests to be handled, but you would not want to keep |
430 | outstanding requests to be handled, but you would not want to keep |
389 | "EV::loop" from returning just because you happen to have this |
431 | "EV::run" from returning just because you happen to have this |
390 | long-running UDP port watcher. |
432 | long-running UDP port watcher. |
391 | |
433 | |
392 | In this case you can clear the keepalive status, which means that |
434 | In this case you can clear the keepalive status, which means that |
393 | even though your watcher is active, it won't keep "EV::loop" from |
435 | even though your watcher is active, it won't keep "EV::run" from |
394 | returning. |
436 | returning. |
395 | |
437 | |
396 | The initial value for keepalive is true (enabled), and you can |
438 | The initial value for keepalive is true (enabled), and you can |
397 | change it any time. |
439 | change it any time. |
398 | |
440 | |
… | |
… | |
440 | TIMER WATCHERS - relative and optionally repeating timeouts |
482 | TIMER WATCHERS - relative and optionally repeating timeouts |
441 | $w = EV::timer $after, $repeat, $callback |
483 | $w = EV::timer $after, $repeat, $callback |
442 | $w = EV::timer_ns $after, $repeat, $callback |
484 | $w = EV::timer_ns $after, $repeat, $callback |
443 | $w = $loop->timer ($after, $repeat, $callback) |
485 | $w = $loop->timer ($after, $repeat, $callback) |
444 | $w = $loop->timer_ns ($after, $repeat, $callback) |
486 | $w = $loop->timer_ns ($after, $repeat, $callback) |
445 | Calls the callback after $after seconds (which may be fractional). |
487 | Calls the callback after $after seconds (which may be fractional or |
446 | If $repeat is non-zero, the timer will be restarted (with the |
488 | negative). If $repeat is non-zero, the timer will be restarted (with |
447 | $repeat value as $after) after the callback returns. |
489 | the $repeat value as $after) after the callback returns. |
448 | |
490 | |
449 | This means that the callback would be called roughly after $after |
491 | This means that the callback would be called roughly after $after |
450 | seconds, and then every $repeat seconds. The timer does his best not |
492 | seconds, and then every $repeat seconds. The timer does his best not |
451 | to drift, but it will not invoke the timer more often then once per |
493 | to drift, but it will not invoke the timer more often then once per |
452 | event loop iteration, and might drift in other cases. If that isn't |
494 | event loop iteration, and might drift in other cases. If that isn't |
… | |
… | |
459 | the same time. |
501 | the same time. |
460 | |
502 | |
461 | The "timer_ns" variant doesn't start (activate) the newly created |
503 | The "timer_ns" variant doesn't start (activate) the newly created |
462 | watcher. |
504 | watcher. |
463 | |
505 | |
464 | $w->set ($after, $repeat) |
506 | $w->set ($after, $repeat = 0) |
465 | Reconfigures the watcher, see the constructor above for details. Can |
507 | Reconfigures the watcher, see the constructor above for details. Can |
466 | be called at any time. |
508 | be called at any time. |
467 | |
509 | |
468 | $w->again |
510 | $w->again |
|
|
511 | $w->again ($repeat) |
469 | Similar to the "start" method, but has special semantics for |
512 | Similar to the "start" method, but has special semantics for |
470 | repeating timers: |
513 | repeating timers: |
471 | |
514 | |
472 | If the timer is active and non-repeating, it will be stopped. |
515 | If the timer is active and non-repeating, it will be stopped. |
473 | |
516 | |
… | |
… | |
481 | |
524 | |
482 | This behaviour is useful when you have a timeout for some IO |
525 | This behaviour is useful when you have a timeout for some IO |
483 | operation. You create a timer object with the same value for $after |
526 | operation. You create a timer object with the same value for $after |
484 | and $repeat, and then, in the read/write watcher, run the "again" |
527 | and $repeat, and then, in the read/write watcher, run the "again" |
485 | method on the timeout. |
528 | method on the timeout. |
|
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529 | |
|
|
530 | If called with a $repeat argument, then it uses this a timer repeat |
|
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531 | value. |
|
|
532 | |
|
|
533 | $after = $w->remaining |
|
|
534 | Calculates and returns the remaining time till the timer will fire. |
|
|
535 | |
|
|
536 | $repeat = $w->repeat |
|
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537 | $old_repeat = $w->repeat ($new_repeat) |
|
|
538 | Returns the current value of the repeat attribute and optionally |
|
|
539 | sets a new one. Setting the new one will not restart the watcher - |
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540 | if the watcher is active, the new repeat value is used whenever it |
|
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541 | expires next. |
486 | |
542 | |
487 | PERIODIC WATCHERS - to cron or not to cron? |
543 | PERIODIC WATCHERS - to cron or not to cron? |
488 | $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
544 | $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
489 | $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
545 | $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
490 | $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback) |
546 | $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback) |
… | |
… | |
507 | system time reaches or surpasses this time. |
563 | system time reaches or surpasses this time. |
508 | |
564 | |
509 | * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
565 | * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
510 | |
566 | |
511 | In this mode the watcher will always be scheduled to time out at |
567 | In this mode the watcher will always be scheduled to time out at |
512 | the next "$at + N * $interval" time (for some integer N) and |
568 | the next "$at + N * $interval" time (for the lowest integer N) |
513 | then repeat, regardless of any time jumps. |
569 | and then repeat, regardless of any time jumps. Note that, since |
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570 | "N" can be negative, the first trigger can happen before $at. |
514 | |
571 | |
515 | This can be used to create timers that do not drift with respect |
572 | This can be used to create timers that do not drift with respect |
516 | to system time: |
573 | to system time: |
517 | |
574 | |
518 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
575 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
519 | |
576 | |
520 | That doesn't mean there will always be 3600 seconds in between |
577 | That doesn't mean there will always be 3600 seconds in between |
521 | triggers, but only that the the clalback will be called when the |
578 | triggers, but only that the the callback will be called when the |
522 | system time shows a full hour (UTC). |
579 | system time shows a full hour (UTC). |
523 | |
580 | |
524 | Another way to think about it (for the mathematically inclined) |
581 | Another way to think about it (for the mathematically inclined) |
525 | is that EV::periodic will try to run the callback in this mode |
582 | is that EV::periodic will try to run the callback in this mode |
526 | at the next possible time where "$time = $at (mod $interval)", |
583 | at the next possible time where "$time = $at (mod $interval)", |
… | |
… | |
534 | first, and the current time as second argument. |
591 | first, and the current time as second argument. |
535 | |
592 | |
536 | *This callback MUST NOT stop or destroy this or any other |
593 | *This callback MUST NOT stop or destroy this or any other |
537 | periodic watcher, ever, and MUST NOT call any event loop |
594 | periodic watcher, ever, and MUST NOT call any event loop |
538 | functions or methods*. If you need to stop it, return 1e30 and |
595 | functions or methods*. If you need to stop it, return 1e30 and |
539 | stop it afterwards. You may create and start a "EV::prepare" |
596 | stop it afterwards. You may create and start an "EV::prepare" |
540 | watcher for this task. |
597 | watcher for this task. |
541 | |
598 | |
542 | It must return the next time to trigger, based on the passed |
599 | It must return the next time to trigger, based on the passed |
543 | time value (that is, the lowest time value larger than or equal |
600 | time value (that is, the lowest time value larger than or equal |
544 | to to the second argument). It will usually be called just |
601 | to to the second argument). It will usually be called just |
545 | before the callback will be triggered, but might be called at |
602 | before the callback will be triggered, but might be called at |
546 | other times, too. |
603 | other times, too. |
547 | |
604 | |
548 | This can be used to create very complex timers, such as a timer |
605 | This can be used to create very complex timers, such as a timer |
549 | that triggers on each midnight, local time (actually 24 hours |
606 | that triggers on each midnight, local time (actually one day |
550 | after the last midnight, to keep the example simple. If you know |
607 | after the last midnight, to keep the example simple): |
551 | a way to do it correctly in about the same space (without |
|
|
552 | requiring elaborate modules), drop me a note :): |
|
|
553 | |
608 | |
554 | my $daily = EV::periodic 0, 0, sub { |
609 | my $daily = EV::periodic 0, 0, sub { |
555 | my ($w, $now) = @_; |
610 | my ($w, $now) = @_; |
556 | |
611 | |
557 | use Time::Local (); |
612 | use Time::Local (); |
558 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
613 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
559 | 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y |
614 | Time::Local::timelocal_nocheck 0, 0, 0, $d + 1, $m, $y |
560 | }, sub { |
615 | }, sub { |
561 | print "it's midnight or likely shortly after, now\n"; |
616 | print "it's midnight or likely shortly after, now\n"; |
562 | }; |
617 | }; |
563 | |
618 | |
564 | The "periodic_ns" variant doesn't start (activate) the newly created |
619 | The "periodic_ns" variant doesn't start (activate) the newly created |
… | |
… | |
571 | $w->again |
626 | $w->again |
572 | Simply stops and starts the watcher again. |
627 | Simply stops and starts the watcher again. |
573 | |
628 | |
574 | $time = $w->at |
629 | $time = $w->at |
575 | Return the time that the watcher is expected to trigger next. |
630 | Return the time that the watcher is expected to trigger next. |
|
|
631 | |
|
|
632 | $offset = $w->offset |
|
|
633 | $old_offset = $w->offset ($new_offset) |
|
|
634 | Returns the current value of the offset attribute and optionally |
|
|
635 | sets a new one. Setting the new one will not restart the watcher - |
|
|
636 | if the watcher is active, the new offset value is used whenever it |
|
|
637 | expires next. |
|
|
638 | |
|
|
639 | $interval = $w->interval |
|
|
640 | $old_interval = $w->interval ($new_interval) |
|
|
641 | See above, for the interval attribute. |
|
|
642 | |
|
|
643 | $reschedule_cb = $w->reschedule_cb |
|
|
644 | $old_reschedule_cb = $w->reschedule_cb ($new_reschedule_cb) |
|
|
645 | See above, for the reschedule callback. |
576 | |
646 | |
577 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
647 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
578 | $w = EV::signal $signal, $callback |
648 | $w = EV::signal $signal, $callback |
579 | $w = EV::signal_ns $signal, $callback |
649 | $w = EV::signal_ns $signal, $callback |
580 | $w = $loop->signal ($signal, $callback) |
650 | $w = $loop->signal ($signal, $callback) |
… | |
… | |
646 | |
716 | |
647 | $pid = $w->rpid |
717 | $pid = $w->rpid |
648 | Return the pid of the awaited child (useful when you have installed |
718 | Return the pid of the awaited child (useful when you have installed |
649 | a watcher for all pids). |
719 | a watcher for all pids). |
650 | |
720 | |
|
|
721 | EV::Child::reinit [EXPERIMENTAL] |
|
|
722 | Internally, libev installs a signal handler for "SIGCHLD". |
|
|
723 | Unfortunately, a lot of Perl code does soemthing like "local |
|
|
724 | $SIG{CHLD}", which, unfortunately, is broken and will not restore |
|
|
725 | the signal handler. |
|
|
726 | |
|
|
727 | If this has happened, you can call this function to stop/rrestart |
|
|
728 | the internal libev watcher, which will reset the signal handler. |
|
|
729 | |
|
|
730 | Note that this is an experimental function, whose interface might |
|
|
731 | change. |
|
|
732 | |
651 | STAT WATCHERS - did the file attributes just change? |
733 | STAT WATCHERS - did the file attributes just change? |
652 | $w = EV::stat $path, $interval, $callback |
734 | $w = EV::stat $path, $interval, $callback |
653 | $w = EV::stat_ns $path, $interval, $callback |
735 | $w = EV::stat_ns $path, $interval, $callback |
654 | $w = $loop->stat ($path, $interval, $callback) |
736 | $w = $loop->stat ($path, $interval, $callback) |
655 | $w = $loop->stat_ns ($path, $interval, $callback) |
737 | $w = $loop->stat_ns ($path, $interval, $callback) |
… | |
… | |
766 | $w = $loop->check_ns ($callback) |
848 | $w = $loop->check_ns ($callback) |
767 | Call the callback just after the process wakes up again (after it |
849 | Call the callback just after the process wakes up again (after it |
768 | has gathered events), but before any other callbacks have been |
850 | has gathered events), but before any other callbacks have been |
769 | invoked. |
851 | invoked. |
770 | |
852 | |
771 | This is used to integrate other event-based software into the EV |
853 | This can be used to integrate other event-based software into the EV |
772 | mainloop: You register a prepare callback and in there, you create |
854 | mainloop: You register a prepare callback and in there, you create |
773 | io and timer watchers as required by the other software. Here is a |
855 | io and timer watchers as required by the other software. Here is a |
774 | real-world example of integrating Net::SNMP (with some details left |
856 | real-world example of integrating Net::SNMP (with some details left |
775 | out): |
857 | out): |
776 | |
858 | |
… | |
… | |
812 | watchers are destroyed before this can happen (remember EV::check |
894 | watchers are destroyed before this can happen (remember EV::check |
813 | gets called first). |
895 | gets called first). |
814 | |
896 | |
815 | The "check_ns" variant doesn't start (activate) the newly created |
897 | The "check_ns" variant doesn't start (activate) the newly created |
816 | watcher. |
898 | watcher. |
|
|
899 | |
|
|
900 | EV::CHECK constant issues |
|
|
901 | Like all other watcher types, there is a bitmask constant for use in |
|
|
902 | $revents and other places. The "EV::CHECK" is special as it has the |
|
|
903 | same name as the "CHECK" sub called by Perl. This doesn't cause big |
|
|
904 | issues on newer perls (beginning with 5.8.9), but it means thatthe |
|
|
905 | constant must be *inlined*, i.e. runtime calls will not work. That |
|
|
906 | means that as long as you always "use EV" and then "EV::CHECK" you |
|
|
907 | are on the safe side. |
817 | |
908 | |
818 | FORK WATCHERS - the audacity to resume the event loop after a fork |
909 | FORK WATCHERS - the audacity to resume the event loop after a fork |
819 | Fork watchers are called when a "fork ()" was detected. The invocation |
910 | Fork watchers are called when a "fork ()" was detected. The invocation |
820 | is done before the event loop blocks next and before "check" watchers |
911 | is done before the event loop blocks next and before "check" watchers |
821 | are being called, and only in the child after the fork. |
912 | are being called, and only in the child after the fork. |
… | |
… | |
878 | |
969 | |
879 | Please see the libev documentation for further details. |
970 | Please see the libev documentation for further details. |
880 | |
971 | |
881 | $w = EV::async $callback |
972 | $w = EV::async $callback |
882 | $w = EV::async_ns $callback |
973 | $w = EV::async_ns $callback |
|
|
974 | $w = $loop->async ($callback) |
|
|
975 | $w = $loop->async_ns ($callback) |
883 | $w->send |
976 | $w->send |
884 | $bool = $w->async_pending |
977 | $bool = $w->async_pending |
|
|
978 | |
|
|
979 | CLEANUP WATCHERS - how to clean up when the event loop goes away |
|
|
980 | Cleanup watchers are not supported on the Perl level, they can only be |
|
|
981 | used via XS currently. |
885 | |
982 | |
886 | PERL SIGNALS |
983 | PERL SIGNALS |
887 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
984 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
888 | with EV is as the same as any other C library: Perl-signals will only be |
985 | with EV is as the same as any other C library: Perl-signals will only be |
889 | handled when Perl runs, which means your signal handler might be invoked |
986 | handled when Perl runs, which means your signal handler might be invoked |
… | |
… | |
923 | |
1020 | |
924 | On win32, there is no notion of fork so all this doesn't apply, of |
1021 | On win32, there is no notion of fork so all this doesn't apply, of |
925 | course. |
1022 | course. |
926 | |
1023 | |
927 | SEE ALSO |
1024 | SEE ALSO |
928 | EV::ADNS (asynchronous DNS), Glib::EV (makes Glib/Gtk2 use EV as event |
1025 | EV::MakeMaker - MakeMaker interface to XS API, EV::ADNS (asynchronous |
929 | loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines |
1026 | DNS), Glib::EV (makes Glib/Gtk2 use EV as event loop), EV::Glib (embed |
930 | with EV), Net::SNMP::EV (asynchronous SNMP), AnyEvent for event-loop |
1027 | Glib into EV), Coro::EV (efficient thread integration), Net::SNMP::EV |
931 | agnostic and portable event driven programming. |
1028 | (asynchronous SNMP), AnyEvent for event-loop agnostic and portable event |
|
|
1029 | driven programming. |
932 | |
1030 | |
933 | AUTHOR |
1031 | AUTHOR |
934 | Marc Lehmann <schmorp@schmorp.de> |
1032 | Marc Lehmann <schmorp@schmorp.de> |
935 | http://home.schmorp.de/ |
1033 | http://home.schmorp.de/ |
936 | |
1034 | |