I wrote a simple test to check it and it does not see reordering on
multiprocessing system. But it does not prove anything of course.
(def transaction-lock
(java.util.concurrent.locks.ReentrantLock.) )
(def transaction-counter (atom 0))
(def counting-agent (agent {:count 1}))
(defn check [agent-state transaction-id]
(if (not= (:count agent-state) transaction-id)
(throw (RuntimeException. "Reordering happened"))
(assoc agent-state :count (inc transaction-id)) ))
(defn work []
(locking transaction-lock
(let [
transaction-id (swap! transaction-counter inc)
]
(send counting-agent check transaction-id)
;(println (str transaction-id " id sent."))
)))
(defn workn [n]
(loop [cnt n]
(when (not (zero? cnt))
(work)
(recur (dec cnt)))))
(defn work10000 [] (workn 10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(.start (Thread. work10000))
(workn 1)
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