On Wed, Nov 26, 2008 at 1:55 PM, Mark Volkmann <[EMAIL PROTECTED]>wrote:
> > The documentation for commute says "Sets the in-transaction-value of > ref ...". This implies to me that when the transaction ends, the ref > will have its previous value. > > (def myRef (ref 19)) > (dosync (commute myRef inc)) -> 20 > @myRef -> 20 > > Why isn't the value of the last line 19? > > -- > R. Mark Volkmann > Object Computing, Inc. > "in-transaction" just means that the new value is seen if code later in the transaction dereferences myRef, while the rest of the program (other threads) will not see the new value until the transaction succeeds. Once the transaction commits, then the rest of the program will also see the new value. If you need something that takes on a new value within a defined scope and then pops off to the previous value, check out Vars and binding. Shawn --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
