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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210538

            Bug ID: 210538
           Summary: [feature request] limit number of running instances in
                    crontab
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mi at FreeBSD.org

Ensuring, only a single instance of a cron-job is running is a very common
requirement. Currently, our cron does not offer any help there -- people must
implement it in their programs/scripts. And it is usually done poorly...

anacron has a special switch -- `-s' -- which would ensure, _every_ job runs no
more than one instance at any time.

I think, we can do better by expanding crontab's syntax to allow specifying the
maximum number of each job's instances allowed.

I'd be happy to implement it, if the idea seems reasonable to someone with a
src-commit bit...

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