Credit RS with canonicalization of
proc every {ms body} {eval $body; after $ms [info level 0]}In the case of a body/script that takes a considerable time fraction of the interval time, the following every is more precise, provided the script under repetitive execution will normally not execute longer than the interval duration:
proc every {ms body} {after $ms [info level 0]; eval $body}The after command is set up prior to the script call (RJM).