Another lateral approach, then. Add into your script a write of the PID to a second, non-locked file after it has successfully gained the exclusive lock. Then your kill-script just needs to read the second, unlocked file and compare its timestamp to that of the locked file (to make sure the second file is not stale).

Caveat: I'm not a Windows user, so this may be no use at all on that platform.

In reply to Re^3: File locking; downgrade an exclusive to a shared lock by hippo
in thread File locking; downgrade an exclusive to a shared lock by The_Dj

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