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   ev_timer_again (&mytimer);


=head2 C<ev_periodic> - to cron or not to cron?

Periodic watchers are also timers of a kind, but they are very versatile
(and unfortunately a bit complex).

Unlike C<ev_timer>, periodic watchers are not based on real time (or
relative time, the physical time that passes) but on wall clock time
(absolute time, the thing you can read on your calendar or clock). The
difference is that wall clock time can run faster or slower than real
time, and time jumps are not uncommon (e.g. when you adjust your
wrist-watch).

You can tell a periodic watcher to trigger after some specific point
in time: for example, if you tell a periodic watcher to trigger "in 10
seconds" (by specifying e.g. C<ev_now () + 10.>, that is, an absolute time
not a delay) and then reset your system clock to January of the previous
year, then it will take a year or more to trigger the event (unlike an
C<ev_timer>, which would still trigger roughly 10 seconds after starting