How to do a cleanup after SIGKILL ?

I'm working on a program which uses shared memory. Multiple instances of said program will either connect to an existing one or create it anew, and give it back to OS when there are no other processes or just detach it and terminate. I thought of using a simple counter to keep track of how many processes use it. I'm using `atexit()` function to do the cleanup, however, afaik, upon receiving SIGKILL signal, processes won't do any cleanup, so if any of those processes don't terminate normally, I might never be able to clean the memory. Is there a way to specify what to do even after a SIGKILL signal? I'm probably going to write some mechanism similar to a timer to check if processes are still alive, but I'd really like to avoid it if there is another way.

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