… | |
… | |
47 | my ($w, $revents) = @_; |
47 | my ($w, $revents) = @_; |
48 | warn $w->path, " has changed somehow.\n"; |
48 | warn $w->path, " has changed somehow.\n"; |
49 | }; |
49 | }; |
50 | |
50 | |
51 | # MAINLOOP |
51 | # MAINLOOP |
52 | EV::run; # loop until EV::unloop is called or all watchers stop |
52 | EV::run; # loop until EV::break is called or all watchers stop |
53 | EV::run EV::RUN_ONCE; # block until at least one event could be handled |
53 | EV::run EV::RUN_ONCE; # block until at least one event could be handled |
54 | EV::run EV::RUN_NOWAIT; # try to handle same events, but do not block |
54 | EV::run EV::RUN_NOWAIT; # try to handle same events, but do not block |
55 | |
55 | |
56 | =head1 BEFORE YOU START USING THIS MODULE |
56 | =head1 BEFORE YOU START USING THIS MODULE |
57 | |
57 | |
… | |
… | |
119 | package EV; |
119 | package EV; |
120 | |
120 | |
121 | use common::sense; |
121 | use common::sense; |
122 | |
122 | |
123 | BEGIN { |
123 | BEGIN { |
124 | our $VERSION = '4.11'; |
124 | our $VERSION = '4.34'; |
125 | use XSLoader; |
125 | use XSLoader; |
|
|
126 | local $^W = 0; # avoid spurious warning |
126 | XSLoader::load "EV", $VERSION; |
127 | XSLoader::load "EV", $VERSION; |
127 | } |
128 | } |
128 | |
129 | |
129 | @EV::IO::ISA = |
130 | @EV::IO::ISA = |
130 | @EV::Timer::ISA = |
131 | @EV::Timer::ISA = |
… | |
… | |
247 | |
248 | |
248 | =item $loop->now_update |
249 | =item $loop->now_update |
249 | |
250 | |
250 | Establishes the current time by querying the kernel, updating the time |
251 | Establishes the current time by querying the kernel, updating the time |
251 | returned by C<EV::now> in the progress. This is a costly operation and |
252 | returned by C<EV::now> in the progress. This is a costly operation and |
252 | is usually done automatically within C<EV::loop>. |
253 | is usually done automatically within C<EV::run>. |
253 | |
254 | |
254 | This function is rarely useful, but when some event callback runs for a |
255 | This function is rarely useful, but when some event callback runs for a |
255 | very long time without entering the event loop, updating libev's idea of |
256 | very long time without entering the event loop, updating libev's idea of |
256 | the current time is a good idea. |
257 | the current time is a good idea. |
257 | |
258 | |
… | |
… | |
295 | =item $active = EV::run [$flags] |
296 | =item $active = EV::run [$flags] |
296 | |
297 | |
297 | =item $active = $loop->run ([$flags]) |
298 | =item $active = $loop->run ([$flags]) |
298 | |
299 | |
299 | Begin checking for events and calling callbacks. It returns when a |
300 | Begin checking for events and calling callbacks. It returns when a |
300 | callback calls EV::unloop or the flasg are nonzero (in which case the |
301 | callback calls EV::break or the flags are nonzero (in which case the |
301 | return value is true) or when there are no active watchers which reference |
302 | return value is true) or when there are no active watchers which reference |
302 | the loop (keepalive is true), in which case the return value will be |
303 | the loop (keepalive is true), in which case the return value will be |
303 | false. The returnv alue can generally be interpreted as "if true, there is |
304 | false. The return value can generally be interpreted as "if true, there is |
304 | more work left to do". |
305 | more work left to do". |
305 | |
306 | |
306 | The $flags argument can be one of the following: |
307 | The $flags argument can be one of the following: |
307 | |
308 | |
308 | 0 as above |
309 | 0 as above |
… | |
… | |
312 | =item EV::break [$how] |
313 | =item EV::break [$how] |
313 | |
314 | |
314 | =item $loop->break ([$how]) |
315 | =item $loop->break ([$how]) |
315 | |
316 | |
316 | When called with no arguments or an argument of EV::BREAK_ONE, makes the |
317 | When called with no arguments or an argument of EV::BREAK_ONE, makes the |
317 | innermost call to EV::loop return. |
318 | innermost call to EV::run return. |
318 | |
319 | |
319 | When called with an argument of EV::BREAK_ALL, all calls to EV::loop will |
320 | When called with an argument of EV::BREAK_ALL, all calls to EV::run will |
320 | return as fast as possible. |
321 | return as fast as possible. |
321 | |
322 | |
322 | When called with an argument of EV::BREAK_CANCEL, any pending break will |
323 | When called with an argument of EV::BREAK_CANCEL, any pending break will |
323 | be cancelled. |
324 | be cancelled. |
324 | |
325 | |
… | |
… | |
341 | | EV::WRITE>, indicating the type of I/O event you want to wait for. If |
342 | | EV::WRITE>, indicating the type of I/O event you want to wait for. If |
342 | you do not want to wait for some I/O event, specify C<undef> for |
343 | you do not want to wait for some I/O event, specify C<undef> for |
343 | C<$fh_or_undef> and C<0> for C<$events>). |
344 | C<$fh_or_undef> and C<0> for C<$events>). |
344 | |
345 | |
345 | If timeout is C<undef> or negative, then there will be no |
346 | If timeout is C<undef> or negative, then there will be no |
346 | timeout. Otherwise a EV::timer with this value will be started. |
347 | timeout. Otherwise an C<EV::timer> with this value will be started. |
347 | |
348 | |
348 | When an error occurs or either the timeout or I/O watcher triggers, then |
349 | When an error occurs or either the timeout or I/O watcher triggers, then |
349 | the callback will be called with the received event set (in general |
350 | the callback will be called with the received event set (in general |
350 | you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, |
351 | you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, |
351 | C<EV::WRITE> and C<EV::TIMER>). |
352 | C<EV::WRITE> and C<EV::TIMER>). |
… | |
… | |
369 | |
370 | |
370 | =item EV::feed_signal $signal |
371 | =item EV::feed_signal $signal |
371 | |
372 | |
372 | Feed a signal event into EV - unlike C<EV::feed_signal_event>, this works |
373 | Feed a signal event into EV - unlike C<EV::feed_signal_event>, this works |
373 | regardless of which loop has registered the signal, and is mainly useful |
374 | regardless of which loop has registered the signal, and is mainly useful |
374 | fro custom signal implementations. |
375 | for custom signal implementations. |
375 | |
376 | |
376 | =item EV::set_io_collect_interval $time |
377 | =item EV::set_io_collect_interval $time |
377 | |
378 | |
378 | =item $loop->set_io_collect_interval ($time) |
379 | =item $loop->set_io_collect_interval ($time) |
379 | |
380 | |
… | |
… | |
506 | returns its C<$revents> bitset (as if its callback was invoked). If the |
507 | returns its C<$revents> bitset (as if its callback was invoked). If the |
507 | watcher isn't pending it does nothing and returns C<0>. |
508 | watcher isn't pending it does nothing and returns C<0>. |
508 | |
509 | |
509 | =item $previous_state = $w->keepalive ($bool) |
510 | =item $previous_state = $w->keepalive ($bool) |
510 | |
511 | |
511 | Normally, C<EV::loop> will return when there are no active watchers |
512 | Normally, C<EV::run> will return when there are no active watchers |
512 | (which is a "deadlock" because no progress can be made anymore). This is |
513 | (which is a "deadlock" because no progress can be made anymore). This is |
513 | convenient because it allows you to start your watchers (and your jobs), |
514 | convenient because it allows you to start your watchers (and your jobs), |
514 | call C<EV::loop> once and when it returns you know that all your jobs are |
515 | call C<EV::run> once and when it returns you know that all your jobs are |
515 | finished (or they forgot to register some watchers for their task :). |
516 | finished (or they forgot to register some watchers for their task :). |
516 | |
517 | |
517 | Sometimes, however, this gets in your way, for example when the module |
518 | Sometimes, however, this gets in your way, for example when the module |
518 | that calls C<EV::loop> (usually the main program) is not the same module |
519 | that calls C<EV::run> (usually the main program) is not the same module |
519 | as a long-living watcher (for example a DNS client module written by |
520 | as a long-living watcher (for example a DNS client module written by |
520 | somebody else even). Then you might want any outstanding requests to be |
521 | somebody else even). Then you might want any outstanding requests to be |
521 | handled, but you would not want to keep C<EV::loop> from returning just |
522 | handled, but you would not want to keep C<EV::run> from returning just |
522 | because you happen to have this long-running UDP port watcher. |
523 | because you happen to have this long-running UDP port watcher. |
523 | |
524 | |
524 | In this case you can clear the keepalive status, which means that even |
525 | In this case you can clear the keepalive status, which means that even |
525 | though your watcher is active, it won't keep C<EV::loop> from returning. |
526 | though your watcher is active, it won't keep C<EV::run> from returning. |
526 | |
527 | |
527 | The initial value for keepalive is true (enabled), and you can change it |
528 | The initial value for keepalive is true (enabled), and you can change it |
528 | any time. |
529 | any time. |
529 | |
530 | |
530 | Example: Register an I/O watcher for some UDP socket but do not keep the |
531 | Example: Register an I/O watcher for some UDP socket but do not keep the |
… | |
… | |
597 | |
598 | |
598 | =item $w = $loop->timer ($after, $repeat, $callback) |
599 | =item $w = $loop->timer ($after, $repeat, $callback) |
599 | |
600 | |
600 | =item $w = $loop->timer_ns ($after, $repeat, $callback) |
601 | =item $w = $loop->timer_ns ($after, $repeat, $callback) |
601 | |
602 | |
602 | Calls the callback after C<$after> seconds (which may be fractional). If |
603 | Calls the callback after C<$after> seconds (which may be fractional or |
603 | C<$repeat> is non-zero, the timer will be restarted (with the $repeat |
604 | negative). If C<$repeat> is non-zero, the timer will be restarted (with |
604 | value as $after) after the callback returns. |
605 | the $repeat value as $after) after the callback returns. |
605 | |
606 | |
606 | This means that the callback would be called roughly after C<$after> |
607 | This means that the callback would be called roughly after C<$after> |
607 | seconds, and then every C<$repeat> seconds. The timer does his best not |
608 | seconds, and then every C<$repeat> seconds. The timer does his best not |
608 | to drift, but it will not invoke the timer more often then once per event |
609 | to drift, but it will not invoke the timer more often then once per event |
609 | loop iteration, and might drift in other cases. If that isn't acceptable, |
610 | loop iteration, and might drift in other cases. If that isn't acceptable, |
… | |
… | |
613 | in front of the machine while the timer is running and changes the system |
614 | in front of the machine while the timer is running and changes the system |
614 | clock, the timer will nevertheless run (roughly) the same time. |
615 | clock, the timer will nevertheless run (roughly) the same time. |
615 | |
616 | |
616 | The C<timer_ns> variant doesn't start (activate) the newly created watcher. |
617 | The C<timer_ns> variant doesn't start (activate) the newly created watcher. |
617 | |
618 | |
618 | =item $w->set ($after, $repeat) |
619 | =item $w->set ($after, $repeat = 0) |
619 | |
620 | |
620 | Reconfigures the watcher, see the constructor above for details. Can be called at |
621 | Reconfigures the watcher, see the constructor above for details. Can be called at |
621 | any time. |
622 | any time. |
622 | |
623 | |
623 | =item $w->again |
624 | =item $w->again |
|
|
625 | |
|
|
626 | =item $w->again ($repeat) |
624 | |
627 | |
625 | Similar to the C<start> method, but has special semantics for repeating timers: |
628 | Similar to the C<start> method, but has special semantics for repeating timers: |
626 | |
629 | |
627 | If the timer is active and non-repeating, it will be stopped. |
630 | If the timer is active and non-repeating, it will be stopped. |
628 | |
631 | |
… | |
… | |
635 | |
638 | |
636 | This behaviour is useful when you have a timeout for some IO |
639 | This behaviour is useful when you have a timeout for some IO |
637 | operation. You create a timer object with the same value for C<$after> and |
640 | operation. You create a timer object with the same value for C<$after> and |
638 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
641 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
639 | on the timeout. |
642 | on the timeout. |
|
|
643 | |
|
|
644 | If called with a C<$repeat> argument, then it uses this a timer repeat |
|
|
645 | value. |
|
|
646 | |
|
|
647 | =item $after = $w->remaining |
|
|
648 | |
|
|
649 | Calculates and returns the remaining time till the timer will fire. |
|
|
650 | |
|
|
651 | =item $repeat = $w->repeat |
|
|
652 | |
|
|
653 | =item $old_repeat = $w->repeat ($new_repeat) |
|
|
654 | |
|
|
655 | Returns the current value of the repeat attribute and optionally sets a |
|
|
656 | new one. Setting the new one will not restart the watcher - if the watcher |
|
|
657 | is active, the new repeat value is used whenever it expires next. |
640 | |
658 | |
641 | =back |
659 | =back |
642 | |
660 | |
643 | |
661 | |
644 | =head3 PERIODIC WATCHERS - to cron or not to cron? |
662 | =head3 PERIODIC WATCHERS - to cron or not to cron? |
… | |
… | |
672 | surpasses this time. |
690 | surpasses this time. |
673 | |
691 | |
674 | =item * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
692 | =item * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
675 | |
693 | |
676 | In this mode the watcher will always be scheduled to time out at the |
694 | In this mode the watcher will always be scheduled to time out at the |
677 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
695 | next C<$at + N * $interval> time (for the lowest integer N) and then repeat, |
678 | regardless of any time jumps. |
696 | regardless of any time jumps. Note that, since C<N> can be negative, the |
|
|
697 | first trigger can happen before C<$at>. |
679 | |
698 | |
680 | This can be used to create timers that do not drift with respect to system |
699 | This can be used to create timers that do not drift with respect to system |
681 | time: |
700 | time: |
682 | |
701 | |
683 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
702 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
684 | |
703 | |
685 | That doesn't mean there will always be 3600 seconds in between triggers, |
704 | That doesn't mean there will always be 3600 seconds in between triggers, |
686 | but only that the the clalback will be called when the system time shows a |
705 | but only that the the callback will be called when the system time shows a |
687 | full hour (UTC). |
706 | full hour (UTC). |
688 | |
707 | |
689 | Another way to think about it (for the mathematically inclined) is that |
708 | Another way to think about it (for the mathematically inclined) is that |
690 | EV::periodic will try to run the callback in this mode at the next |
709 | EV::periodic will try to run the callback in this mode at the next |
691 | possible time where C<$time = $at (mod $interval)>, regardless of any time |
710 | possible time where C<$time = $at (mod $interval)>, regardless of any time |
… | |
… | |
699 | time as second argument. |
718 | time as second argument. |
700 | |
719 | |
701 | I<This callback MUST NOT stop or destroy this or any other periodic |
720 | I<This callback MUST NOT stop or destroy this or any other periodic |
702 | watcher, ever, and MUST NOT call any event loop functions or methods>. If |
721 | watcher, ever, and MUST NOT call any event loop functions or methods>. If |
703 | you need to stop it, return 1e30 and stop it afterwards. You may create |
722 | you need to stop it, return 1e30 and stop it afterwards. You may create |
704 | and start a C<EV::prepare> watcher for this task. |
723 | and start an C<EV::prepare> watcher for this task. |
705 | |
724 | |
706 | It must return the next time to trigger, based on the passed time value |
725 | It must return the next time to trigger, based on the passed time value |
707 | (that is, the lowest time value larger than or equal to to the second |
726 | (that is, the lowest time value larger than or equal to to the second |
708 | argument). It will usually be called just before the callback will be |
727 | argument). It will usually be called just before the callback will be |
709 | triggered, but might be called at other times, too. |
728 | triggered, but might be called at other times, too. |
710 | |
729 | |
711 | This can be used to create very complex timers, such as a timer that |
730 | This can be used to create very complex timers, such as a timer that |
712 | triggers on each midnight, local time (actually 24 hours after the last |
731 | triggers on each midnight, local time (actually one day after the last |
713 | midnight, to keep the example simple. If you know a way to do it correctly |
732 | midnight, to keep the example simple): |
714 | in about the same space (without requiring elaborate modules), drop me a |
|
|
715 | note :): |
|
|
716 | |
733 | |
717 | my $daily = EV::periodic 0, 0, sub { |
734 | my $daily = EV::periodic 0, 0, sub { |
718 | my ($w, $now) = @_; |
735 | my ($w, $now) = @_; |
719 | |
736 | |
720 | use Time::Local (); |
737 | use Time::Local (); |
721 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
738 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
722 | 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y |
739 | Time::Local::timelocal_nocheck 0, 0, 0, $d + 1, $m, $y |
723 | }, sub { |
740 | }, sub { |
724 | print "it's midnight or likely shortly after, now\n"; |
741 | print "it's midnight or likely shortly after, now\n"; |
725 | }; |
742 | }; |
726 | |
743 | |
727 | =back |
744 | =back |
… | |
… | |
738 | Simply stops and starts the watcher again. |
755 | Simply stops and starts the watcher again. |
739 | |
756 | |
740 | =item $time = $w->at |
757 | =item $time = $w->at |
741 | |
758 | |
742 | Return the time that the watcher is expected to trigger next. |
759 | Return the time that the watcher is expected to trigger next. |
|
|
760 | |
|
|
761 | =item $offset = $w->offset |
|
|
762 | |
|
|
763 | =item $old_offset = $w->offset ($new_offset) |
|
|
764 | |
|
|
765 | Returns the current value of the offset attribute and optionally sets a |
|
|
766 | new one. Setting the new one will not restart the watcher - if the watcher |
|
|
767 | is active, the new offset value is used whenever it expires next. |
|
|
768 | |
|
|
769 | =item $interval = $w->interval |
|
|
770 | |
|
|
771 | =item $old_interval = $w->interval ($new_interval) |
|
|
772 | |
|
|
773 | See above, for the interval attribute. |
|
|
774 | |
|
|
775 | =item $reschedule_cb = $w->reschedule_cb |
|
|
776 | |
|
|
777 | =item $old_reschedule_cb = $w->reschedule_cb ($new_reschedule_cb) |
|
|
778 | |
|
|
779 | See above, for the reschedule callback. |
743 | |
780 | |
744 | =back |
781 | =back |
745 | |
782 | |
746 | |
783 | |
747 | =head3 SIGNAL WATCHERS - signal me when a signal gets signalled! |
784 | =head3 SIGNAL WATCHERS - signal me when a signal gets signalled! |
… | |
… | |
835 | |
872 | |
836 | =item $pid = $w->rpid |
873 | =item $pid = $w->rpid |
837 | |
874 | |
838 | Return the pid of the awaited child (useful when you have installed a |
875 | Return the pid of the awaited child (useful when you have installed a |
839 | watcher for all pids). |
876 | watcher for all pids). |
|
|
877 | |
|
|
878 | =item EV::Child::reinit [EXPERIMENTAL] |
|
|
879 | |
|
|
880 | Internally, libev installs a signal handler for C<SIGCHLD>. Unfortunately, |
|
|
881 | a lot of Perl code does soemthing like C<< local $SIG{CHLD} >>, which, |
|
|
882 | unfortunately, is broken and will not restore the signal handler. |
|
|
883 | |
|
|
884 | If this has happened, you can call this function to stop/rrestart the |
|
|
885 | internal libev watcher, which will reset the signal handler. |
|
|
886 | |
|
|
887 | Note that this is an experimental function, whose interface might change. |
840 | |
888 | |
841 | =back |
889 | =back |
842 | |
890 | |
843 | |
891 | |
844 | =head3 STAT WATCHERS - did the file attributes just change? |
892 | =head3 STAT WATCHERS - did the file attributes just change? |