GNU Parallel processing of SIGTERM: proposal 2

[Martin d'Anjou]

Hello Ole and GNU Parallel readers,

I am staring anew because I have taken a different approach than the one 
I documented in the other emails I have sent.

This time, I updated the documentation first, so as to describe the new 
features I am proposing.

I have pushed the feature description to github:
https://github.com/martinda/gnu-parallel/compare/sigterm-2?expand=1

The problems I try to address are:
- I would like GNU parallel to send SIGTERM to the jobs when kill -TERM 
is issued to GNU parallel, because I do not want GNU Parallel to wait 
for those jobs to run to full completion, I want them to terminate but 
do so gracefully, then pass control back to GNU Parallel.
- I need a longer grace period than the hardcoded 200ms delay. Because 
some jobs are part of a bigger chain of scripts where delays can be long.

To provide a flexible and general answer to termination handling, I am 
proposing to optionally let the user choose a custom signal termination 
sequence, but keep the default one in place if the user does not need a 
different one. The default termination sequence is TERM, wait 200ms, 
TERM, wait 200ms, KILL.

Should I also publish the documentation changes I posted to github on 
this mailing list?

Question:
The termination sequence is used when --timeout expires. It is currently 
used under other conditions?

Thank you,
Martin