celery/celery — pull request #1586 by dmtaub (2013-10-22 05:28:10+00:00)
Title: adding a worker_process_shutdown signal in celery by overloading the new on_loop_stop in billiard

This is the aforementioned change to Celery that my pulled change in billiard implies.
It's been assembled into a single shiny new commit, plus one for a contributor addition.