trivial-monitored-thread
Trivial Monitored Thread offers a very simple (aka trivial) way of spawning threads and being informed when one any of them crash and die.
$ area51 add trivial-monitored-threadCopyUsage
;; area51 add updates your .asd automatically.
;; Use the package in your code:
(in-package :my-project)
(trivial-monitored-thread:some-function ...)