| Description: | This module provides a simple but complete cron like scheduler. I.e
this modules can be used for periodically executing Perl subroutines.
The dates and parameters for the subroutines to be called are
specified with a format known as crontab entry (see man page crontab(5)
or documentation of Schedule::Cron).
The philosophy behind Schedule::Cron is to call subroutines
periodically from within one single Perl program instead of letting
cron trigger several (possibly different) Perl scripts. Everything
under one roof. Furthermore Schedule::Cron provides mechanism to
create crontab entries dynamically, which isn't that easy with cron.
Schedule::Cron knows about all extensions (well, at least all
extensions I'm aware of, i.e those of the so called "Vixie" cron) for
crontab entries like ranges including 'steps', specification of month
and days of the week by name or coexistence of lists and ranges in the
same field. And even a bit more (like lists and ranges with symbolic
names).
This module is rather effective concerning system load. It calculates
the execution dates in advance and will sleep until those dates are
reached (and wont wake up every minute to check for execution like
cron). However, it relies on the accuracy of your sleep() system
call. |
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