… | |
… | |
16 | warn "is called roughly every 2s (repeat = 1)"; |
16 | warn "is called roughly every 2s (repeat = 1)"; |
17 | }; |
17 | }; |
18 | |
18 | |
19 | undef $w; # destroy event watcher again |
19 | undef $w; # destroy event watcher again |
20 | |
20 | |
21 | my $w = EV::periodic 0, 60, sub { |
21 | my $w = EV::periodic 0, 60, 0, sub { |
22 | warn "is called every minute, on the minute, exactly"; |
22 | warn "is called every minute, on the minute, exactly"; |
23 | }; |
23 | }; |
24 | |
24 | |
25 | # IO |
25 | # IO |
26 | |
26 | |
… | |
… | |
40 | }; |
40 | }; |
41 | |
41 | |
42 | # CHILD/PID STATUS CHANGES |
42 | # CHILD/PID STATUS CHANGES |
43 | |
43 | |
44 | my $w = EV::child 666, sub { |
44 | my $w = EV::child 666, sub { |
45 | my ($w, $revents, $status) = @_; |
45 | my ($w, $revents) = @_; |
|
|
46 | # my $pid = $w->rpid; |
|
|
47 | my $status = $w->rstatus; |
46 | }; |
48 | }; |
47 | |
49 | |
48 | # MAINLOOP |
50 | # MAINLOOP |
49 | EV::loop; # loop until EV::loop_done is called |
51 | EV::loop; # loop until EV::loop_done is called |
50 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
52 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
… | |
… | |
60 | package EV; |
62 | package EV; |
61 | |
63 | |
62 | use strict; |
64 | use strict; |
63 | |
65 | |
64 | BEGIN { |
66 | BEGIN { |
65 | our $VERSION = '0.5'; |
67 | our $VERSION = '0.51'; |
66 | use XSLoader; |
68 | use XSLoader; |
67 | XSLoader::load "EV", $VERSION; |
69 | XSLoader::load "EV", $VERSION; |
68 | } |
70 | } |
69 | |
71 | |
70 | @EV::Io::ISA = |
72 | @EV::Io::ISA = |
… | |
… | |
184 | |
186 | |
185 | =item $bool = $w->is_active |
187 | =item $bool = $w->is_active |
186 | |
188 | |
187 | Returns true if the watcher is active, false otherwise. |
189 | Returns true if the watcher is active, false otherwise. |
188 | |
190 | |
|
|
191 | =item $current_data = $w->data |
|
|
192 | |
|
|
193 | =item $old_data = $w->data ($new_data) |
|
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194 | |
|
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195 | Queries a freely usable data scalar on the watcher and optionally changes |
|
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196 | it. This is a way to associate custom data with a watcher: |
|
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197 | |
|
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198 | my $w = EV::timer 60, 0, sub { |
|
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199 | warn $_[0]->data; |
|
|
200 | }; |
|
|
201 | $w->data ("print me!"); |
|
|
202 | |
189 | =item $current_cb = $w->cb |
203 | =item $current_cb = $w->cb |
190 | |
204 | |
191 | =item $old_cb = $w->cb ($new_cb) |
205 | =item $old_cb = $w->cb ($new_cb) |
192 | |
206 | |
193 | Queries the callback on the watcher and optionally changes it. You can do |
207 | Queries the callback on the watcher and optionally changes it. You can do |
… | |
… | |
283 | operation. You create a timer object with the same value for C<$after> and |
297 | operation. You create a timer object with the same value for C<$after> and |
284 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
298 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
285 | on the timeout. |
299 | on the timeout. |
286 | |
300 | |
287 | |
301 | |
288 | =item $w = EV::periodic $at, $interval, $callback |
302 | =item $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
289 | |
303 | |
290 | =item $w = EV::periodic_ns $at, $interval, $callback |
304 | =item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
291 | |
305 | |
292 | Similar to EV::timer, but the time is given as an absolute point in time |
306 | Similar to EV::timer, but is not based on relative timeouts but on |
293 | (C<$at>), plus an optional C<$interval>. |
307 | absolute times. Apart from creating "simple" timers that trigger "at" the |
|
|
308 | specified time, it can also be used for non-drifting absolute timers and |
|
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309 | more complex, cron-like, setups that are not adversely affected by time |
|
|
310 | jumps (i.e. when the system clock is changed by explicit date -s or other |
|
|
311 | means such as ntpd). It is also the most complex watcher type in EV. |
294 | |
312 | |
295 | If the C<$interval> is zero, then the callback will be called at the time |
313 | It has three distinct "modes": |
296 | C<$at> if that is in the future, or as soon as possible if it is in the |
|
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297 | past. It will not automatically repeat. |
|
|
298 | |
314 | |
299 | If the C<$interval> is nonzero, then the watcher will always be scheduled |
315 | =over 4 |
300 | to time out at the next C<$at + N * $interval> time. |
|
|
301 | |
316 | |
302 | This can be used to schedule a callback to run at very regular intervals, |
317 | =item * absolute timer ($interval = $reschedule_cb = 0) |
303 | as long as the processing time is less then the interval (otherwise |
318 | |
304 | obviously events will be skipped). |
319 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
|
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320 | will not adjust when a time jump occurs, that is, if it is to be run |
|
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321 | at January 1st 2011 then it will run when the system time reaches or |
|
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322 | surpasses this time. |
|
|
323 | |
|
|
324 | =item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0) |
|
|
325 | |
|
|
326 | In this mode the watcher will always be scheduled to time out at the |
|
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327 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
|
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328 | regardless of any time jumps. |
|
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329 | |
|
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330 | This can be used to create timers that do not drift with respect to system |
|
|
331 | time: |
|
|
332 | |
|
|
333 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
|
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334 | |
|
|
335 | That doesn't mean there will always be 3600 seconds in between triggers, |
|
|
336 | but only that the the clalback will be called when the system time shows a |
|
|
337 | full hour (UTC). |
305 | |
338 | |
306 | Another way to think about it (for the mathematically inclined) is that |
339 | Another way to think about it (for the mathematically inclined) is that |
307 | EV::periodic will try to run the callback at the next possible time where |
340 | EV::periodic will try to run the callback in this mode at the next |
308 | C<$time = $at (mod $interval)>, regardless of any time jumps. |
341 | possible time where C<$time = $at (mod $interval)>, regardless of any time |
|
|
342 | jumps. |
309 | |
343 | |
310 | This periodic timer is based on "wallclock time", that is, if the clock |
344 | =item * manual reschedule mode ($reschedule_cb = coderef) |
311 | changes (C<ntp>, C<date -s> etc.), then the timer will nevertheless run at |
345 | |
312 | the specified time. This means it will never drift (it might jitter, but |
346 | In this mode $interval and $at are both being ignored. Instead, each time |
313 | it will not drift). |
347 | the periodic watcher gets scheduled, the first callback ($reschedule_cb) |
|
|
348 | will be called with the watcher as first, and the current time as second |
|
|
349 | argument. |
|
|
350 | |
|
|
351 | I<This callback MUST NOT stop or destroy the event watcher, ever.> |
|
|
352 | |
|
|
353 | It must return the next time to trigger, based on the passed time value |
|
|
354 | (that is, the lowest time value larger than to the second argument). It |
|
|
355 | will usually be called just before the callback will be triggered, but |
|
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356 | might be called at other times, too. |
|
|
357 | |
|
|
358 | This can be used to create very complex timers, such as a timer that |
|
|
359 | triggers on each midnight, local time (actually 24 hours after the last |
|
|
360 | midnight, to keep the example simple. If you know a way to do it correctly |
|
|
361 | in about the same space (without requiring elaborate modules), drop me a |
|
|
362 | note :): |
|
|
363 | |
|
|
364 | my $daily = EV::periodic 0, 0, sub { |
|
|
365 | my ($w, $now) = @_; |
|
|
366 | |
|
|
367 | use Time::Local (); |
|
|
368 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
|
|
369 | 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y |
|
|
370 | }, sub { |
|
|
371 | print "it's midnight or likely shortly after, now\n"; |
|
|
372 | }; |
|
|
373 | |
|
|
374 | =back |
314 | |
375 | |
315 | The C<periodic_ns> variant doesn't start (activate) the newly created watcher. |
376 | The C<periodic_ns> variant doesn't start (activate) the newly created watcher. |
316 | |
377 | |
317 | =item $w->set ($at, $interval) |
378 | =item $w->set ($at, $interval, $reschedule_cb) |
318 | |
379 | |
319 | Reconfigures the watcher, see the constructor above for details. Can be at |
380 | Reconfigures the watcher, see the constructor above for details. Can be at |
320 | any time. |
381 | any time. |
|
|
382 | |
|
|
383 | =item $w->again |
|
|
384 | |
|
|
385 | Simply stops and starts the watcher again. |
321 | |
386 | |
322 | |
387 | |
323 | =item $w = EV::signal $signal, $callback |
388 | =item $w = EV::signal $signal, $callback |
324 | |
389 | |
325 | =item $w = EV::signal_ns $signal, $callback |
390 | =item $w = EV::signal_ns $signal, $callback |
… | |
… | |
356 | Call the callback when a status change for pid C<$pid> (or any pid |
421 | Call the callback when a status change for pid C<$pid> (or any pid |
357 | if C<$pid> is 0) has been received. More precisely: when the process |
422 | if C<$pid> is 0) has been received. More precisely: when the process |
358 | receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all |
423 | receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all |
359 | changed/zombie children and call the callback. |
424 | changed/zombie children and call the callback. |
360 | |
425 | |
361 | Unlike all other callbacks, this callback will be called with an |
426 | You can access both status and pid by using the C<rstatus> and C<rpid> |
362 | additional third argument which is the exit status. See the C<waitpid> |
427 | methods on the watcher object. |
363 | function for details. |
|
|
364 | |
428 | |
365 | You can have as many pid watchers per pid as you want. |
429 | You can have as many pid watchers per pid as you want. |
366 | |
430 | |
367 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
431 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
368 | |
432 | |
… | |
… | |
374 | =item $current_pid = $w->pid |
438 | =item $current_pid = $w->pid |
375 | |
439 | |
376 | =item $old_pid = $w->pid ($new_pid) |
440 | =item $old_pid = $w->pid ($new_pid) |
377 | |
441 | |
378 | Returns the previously set process id and optionally set a new one. |
442 | Returns the previously set process id and optionally set a new one. |
|
|
443 | |
|
|
444 | =item $exit_status = $w->rstatus |
|
|
445 | |
|
|
446 | Return the exit/wait status (as returned by waitpid, see the waitpid entry |
|
|
447 | in perlfunc). |
|
|
448 | |
|
|
449 | =item $pid = $w->rpid |
|
|
450 | |
|
|
451 | Return the pid of the awaited child (useful when you have installed a |
|
|
452 | watcher for all pids). |
379 | |
453 | |
380 | |
454 | |
381 | =item $w = EV::idle $callback |
455 | =item $w = EV::idle $callback |
382 | |
456 | |
383 | =item $w = EV::idle_ns $callback |
457 | =item $w = EV::idle_ns $callback |
… | |
… | |
464 | |
538 | |
465 | our $DIED = sub { |
539 | our $DIED = sub { |
466 | warn "EV: error in callback (ignoring): $@"; |
540 | warn "EV: error in callback (ignoring): $@"; |
467 | }; |
541 | }; |
468 | |
542 | |
469 | init; |
543 | default_loop |
|
|
544 | or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?'; |
470 | |
545 | |
471 | push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"]; |
546 | push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"]; |
472 | |
547 | |
473 | 1; |
548 | 1; |
474 | |
549 | |