Counting aborted transactions in Clojure

Question

I would like to analyze the behavior of a Clojure program versus a locking version in C. One metric I would like to track is the total number of aborted transactions for my Clojure program.

The only problem is that I can't mutate a variable outside of the context of the transaction that I am in. What I'm trying to do is this:

(dosync
(try
  (alter my_num inc)
  (catch Throwable t
    (do
      (alter total_aborts inc)
      (println "Caught " (.getClass t))
      (throw t)))))

Of course, total_aborts will never get incremented if the transaction doesn't finish!!! So how can I do this? Thanks!

http://stackoverflow.com/questions/4792197/how-can-i-see-the-number-of-rollbacks-in-my-stm-in-clojure — Gene T, Feb 03 '12 at 04:47

score 6 · Accepted Answer · answered Nov 14 '11 at 18:06

6

You can make my-num and total-aborts atoms and use swap! instead of alter.

answered Nov 14 '11 at 18:06

Matthias Benkard

15,497
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Thanks!I had forgotten about atoms. – Timoteo Nov 14 '11 at 19:42

Counting aborted transactions in Clojure

1 Answers1