On 21 February 2010 14:13, Michael Wood <[email protected]> wrote:
> That does demonstrate the difference (or a difference), but I don't
> get 3 printlns.
Ouch, I actually posted the wrong version of the function. Here's an
improvement in the context of a REPL interaction:
1. ensure version:
user> (defn funk [r]
(dosync
(println (ensure r))
(Thread/sleep 5000)
(println (ensure r))))
#'user/funk
user> (def r (ref 1))
#'user/r
user> (.start (Thread. #(funk r)))
1
nil
user> (dosync (ref-set r 5))
1
5
2. deref version:
user> (defn funk [r]
(dosync
(println @r)
(Thread/sleep 5000)
(println @r)))
#'user/funk
user> (def r (ref 1))
#'user/r
user> (.start (Thread. #(funk r)))
1
nil
user> (dosync (ref-set r 5))
5
5
5
Note how the deref version prints more lines (because it retries the
transaction).
I'm using a newer commit (49a7d6b8e14050a45df5332e768ba6647752215d),
but this shouldn't make any difference.
Sincerely,
Michał
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