Hi Rich, hi all,
A question: is it possible to kill or interrupt an agent during a long-
running action, e.g.,
(def the-agent (agent nil))
(send-off the-agent really-long-action)
;; Oops, I changed my mind.
(interrupt the-agent)
;; The thread running really-long-action stops, aborting any
;; transactions, and the-agent is free to receive another action.
The java.lang.Thread docs make it clear that killing off threads
arbitrarily is a bad idea, because any objects in use by those threads
could be left in an inconsistent state. But I assume Clojure's STM
could take care of that problem.
One option would be to use a second agent as a flag. My really-long-
action function could periodically check the value of that agent, and
terminate if it's been set to true. But would it be possible to
provide a generic interrupt mechanism that doesn't require modifying
the action function?
My use-case is a REPL-like utility that can run each expression the
user types in a separate thread, and can kill off threads that are
misbehaving or not terminating.
-Stuart Sierra
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