Gracefully stopping an infinite loop after a particular keyboard input

I am having a script that is doing some tests continuously. I am
running it from cygwin under Windows OS and is currently using CTRL+C
to stop the script. But by "ctrl+c" the script stops at that very
moment. In between there are some read write operations going on files
and when the script stops atonce.

I want that when I press any key say "Q" from keyboard , the script
should complete that particular loop and then stop. (Hope I am able to
clarify my problem).

.

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