Thanks for the link. :) I understand that the behavior I'm seeing is correct. Any idea how to achieve the desired behavior, though?
On Wed, Jul 31, 2013 at 12:06 PM, Timothy Baldridge <tbaldri...@gmail.com>wrote: > The answer is here: > > > https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LockingTransaction.java#L361 > > Agents and watches are dispatched outside of the transaction locking. This > means that multiple transactions could be executing watches in parallel, > and hence execute out of order. > > Timothy Baldridge > > > On Wed, Jul 31, 2013 at 9:43 AM, Michael Drogalis <madrush...@gmail.com>wrote: > >> I can precisely exemplify the behavior here: >> >> https://gist.github.com/MichaelDrogalis/6123177 >> >> >> On Wednesday, July 31, 2013 11:13:17 AM UTC-4, Michael Drogalis wrote: >>> >>> Aaron: Yep, I'm aware - and am using the value provided by the last >>> parameter. >>> >>> This is going to be tough to show the problem without bringing more >>> details of my concurrency set up. >>> I'm not sure if this will exhibit the problem, but this is what it boils >>> down to: >>> >>> https://gist.github.com/**MichaelDrogalis/6122834<https://gist.github.com/MichaelDrogalis/6122834> >>> >>> When enough threads are trying to write to the queue, the watches >>> triggered later can finish before watches triggered earlier. >>> >>> >>> On Wednesday, July 31, 2013 11:05:16 AM UTC-4, Aaron Cohen wrote: >>>> >>>> A watcher fn has 4 parameters: key, reference, old-state, new-state >>>> >>>> If you use old-state and new-state rather than the reference, you >>>> should not see your problem. >>>> >>>> --Aaron >>>> >>>> >>>> On Wed, Jul 31, 2013 at 11:00 AM, Michael Drogalis >>>> <madru...@gmail.com>wrote: >>>> >>>>> Problem: >>>>> >>>>> I have a ref representing a queue of people in line. >>>>> I add a watch to the ref to print out the contents of the queue >>>>> whenever it changes. >>>>> Naturally, and expected, the following can happen if queuing happens >>>>> in rapid succession: >>>>> >>>>> Queue: [] >>>>> <add "Mike" to queue> >>>>> <add "John" to queue> >>>>> >>>>> console: "Queue is Mike, John" >>>>> console: "Queue is Mike" >>>>> >>>>> I'd like to write a UI for this program, but I clearly can't reliably >>>>> render based on the result delivered >>>>> by the add-watch hook. What's the solution for this problem? >>>>> >>>>> -- >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Clojure" group. >>>>> To post to this group, send email to clo...@googlegroups.com >>>>> Note that posts from new members are moderated - please be patient >>>>> with your first post. >>>>> To unsubscribe from this group, send email to >>>>> clojure+u...@googlegroups.com >>>>> For more options, visit this group at >>>>> http://groups.google.com/**group/clojure?hl=en<http://groups.google.com/group/clojure?hl=en> >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Clojure" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to clojure+u...@googlegroups.com. >>>>> For more options, visit >>>>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>>>> . >>>>> >>>>> >>>>> >>>> >>>> -- >> -- >> 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 >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > > > -- > “One of the main causes of the fall of the Roman Empire was that–lacking > zero–they had no way to indicate successful termination of their C > programs.” > (Robert Firth) > > -- > -- > 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 > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "Clojure" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/clojure/0b5HWJE6Jx4/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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