Must be called in a transaction. Sets the in-transaction-value of ref to:
(apply fun in-transaction-value-of-ref args)
and returns the in-transaction-value of ref.
At the commit point of the transaction, sets the value of ref to be:
(apply fun most-recently-committed-value-of-ref args)
Thus fun should be commutative, or, failing that, you must accept last-one-in-wins behavior. commute allows for more concurrency than ref-set.
; clojure/core.clj:1349 (defn commute [#^clojure.lang.Ref ref fun & args] (. ref (commute fun args)))
Copyright (c) Rich Hickey. All rights reserved.
The use and distribution terms for this software are covered by the Eclipse Public License 1.0, which can be found in the file epl-v10.html at the root of this distribution. By using this software in any fashion, you are agreeing to be bound by the terms of this license. You must not remove this notice, or any other, from this software.