[Bug 210538] [feature request] limit number of running instances in crontab

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 25 Jan 2022 22:17:08 UTC

Mikhail Teterin <mi@FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |glebius@FreeBSD.org

--- Comment #2 from Mikhail Teterin <mi@FreeBSD.org> ---
(In reply to Alan Somers from comment #1)
> This feature was added in SVN r334817.

That's related, but not quite the same thing... The commit by @glebius provides
for running "every X seconds" -- and is useful for frequent jobs.

But it'd be difficult to use even with periodic(8) -- which still does its own
locking -- because you cannot specify the desired schedule time.

The feature I envisioned was a safeguard against jobs running unusually long.
The feature implemented in r334817 is for jobs, that do usually run long...

Try rephrasing the periodic-entries in today's /etc/crontab to use Gleb's new
syntax -- so that /usr/sbin/periodic no longer needs its own locking. You

Please, reopen this PR.

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