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Comparing EV/EV.pm (file contents):
Revision 1.149 by root, Wed Apr 20 13:43:39 2016 UTC vs.
Revision 1.153 by root, Sun Oct 28 23:51:23 2018 UTC

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342| 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
343you do not want to wait for some I/O event, specify C<undef> for 343you do not want to wait for some I/O event, specify C<undef> for
344C<$fh_or_undef> and C<0> for C<$events>). 344C<$fh_or_undef> and C<0> for C<$events>).
345 345
346If timeout is C<undef> or negative, then there will be no 346If timeout is C<undef> or negative, then there will be no
347timeout. Otherwise a EV::timer with this value will be started. 347timeout. Otherwise an C<EV::timer> with this value will be started.
348 348
349When an error occurs or either the timeout or I/O watcher triggers, then 349When an error occurs or either the timeout or I/O watcher triggers, then
350the callback will be called with the received event set (in general 350the callback will be called with the received event set (in general
351you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, 351you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
352C<EV::WRITE> and C<EV::TIMER>). 352C<EV::WRITE> and C<EV::TIMER>).
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598 598
599=item $w = $loop->timer ($after, $repeat, $callback) 599=item $w = $loop->timer ($after, $repeat, $callback)
600 600
601=item $w = $loop->timer_ns ($after, $repeat, $callback) 601=item $w = $loop->timer_ns ($after, $repeat, $callback)
602 602
603Calls the callback after C<$after> seconds (which may be fractional). If 603Calls the callback after C<$after> seconds (which may be fractional or
604C<$repeat> is non-zero, the timer will be restarted (with the $repeat 604negative). If C<$repeat> is non-zero, the timer will be restarted (with
605value as $after) after the callback returns. 605the $repeat value as $after) after the callback returns.
606 606
607This means that the callback would be called roughly after C<$after> 607This means that the callback would be called roughly after C<$after>
608seconds, and then every C<$repeat> seconds. The timer does his best not 608seconds, and then every C<$repeat> seconds. The timer does his best not
609to drift, but it will not invoke the timer more often then once per event 609to drift, but it will not invoke the timer more often then once per event
610loop iteration, and might drift in other cases. If that isn't acceptable, 610loop iteration, and might drift in other cases. If that isn't acceptable,
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682surpasses this time. 682surpasses this time.
683 683
684=item * repeating interval timer ($interval > 0, $reschedule_cb = 0) 684=item * repeating interval timer ($interval > 0, $reschedule_cb = 0)
685 685
686In this mode the watcher will always be scheduled to time out at the 686In this mode the watcher will always be scheduled to time out at the
687next C<$at + N * $interval> time (for some integer N) and then repeat, 687next C<$at + N * $interval> time (for the lowest integer N) and then repeat,
688regardless of any time jumps. 688regardless of any time jumps. Note that, since C<N> can be negative, the
689first trigger can happen before C<$at>.
689 690
690This can be used to create timers that do not drift with respect to system 691This can be used to create timers that do not drift with respect to system
691time: 692time:
692 693
693 my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; 694 my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" };
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709time as second argument. 710time as second argument.
710 711
711I<This callback MUST NOT stop or destroy this or any other periodic 712I<This callback MUST NOT stop or destroy this or any other periodic
712watcher, ever, and MUST NOT call any event loop functions or methods>. If 713watcher, ever, and MUST NOT call any event loop functions or methods>. If
713you need to stop it, return 1e30 and stop it afterwards. You may create 714you need to stop it, return 1e30 and stop it afterwards. You may create
714and start a C<EV::prepare> watcher for this task. 715and start an C<EV::prepare> watcher for this task.
715 716
716It must return the next time to trigger, based on the passed time value 717It must return the next time to trigger, based on the passed time value
717(that is, the lowest time value larger than or equal to to the second 718(that is, the lowest time value larger than or equal to to the second
718argument). It will usually be called just before the callback will be 719argument). It will usually be called just before the callback will be
719triggered, but might be called at other times, too. 720triggered, but might be called at other times, too.
720 721
721This can be used to create very complex timers, such as a timer that 722This can be used to create very complex timers, such as a timer that
722triggers on each midnight, local time (actually 24 hours after the last 723triggers on each midnight, local time (actually one day after the last
723midnight, to keep the example simple. If you know a way to do it correctly 724midnight, to keep the example simple):
724in about the same space (without requiring elaborate modules), drop me a
725note :):
726 725
727 my $daily = EV::periodic 0, 0, sub { 726 my $daily = EV::periodic 0, 0, sub {
728 my ($w, $now) = @_; 727 my ($w, $now) = @_;
729 728
730 use Time::Local (); 729 use Time::Local ();
731 my (undef, undef, undef, $d, $m, $y) = localtime $now; 730 my (undef, undef, undef, $d, $m, $y) = localtime $now;
732 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y 731 Time::Local::timelocal_nocheck 0, 0, 0, $d + 1, $m, $y
733 }, sub { 732 }, sub {
734 print "it's midnight or likely shortly after, now\n"; 733 print "it's midnight or likely shortly after, now\n";
735 }; 734 };
736 735
737=back 736=back

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