I like the idea of re-entrant procedures to do various sub-processes at differing time intervals; something like:

======
proc dothis {delay} {
    # do something here
    after $delay dothis
}
======

My concern is that ultimately I might run into stack problems or memory problems that will make the calling application become unstable.

Am I right to be concerned or is it not a problem?

If it is a problem then what would be a better way to handle this concept?

Be gentle!  Concepts such as threads and mutex etc. are a tad foreign to me  :)

Regs.

-----

Your example does not use threads, nor does it experience
unbounded stack or memory usage growth.

See [every] for the more polished realization.