re: binding behavior, I've only been using clojure since 1.5.1, but in my
travels I get the impression that the binding form didn't always enforce
the variable to be declared dynamic, and so maybe didn't behave the way
you'd expect if the ^:dynamic was missing from the target of the binding
form. Just guessing.
On Sat, May 3, 2014 at 11:08 AM, Lee Spector <lspec...@hampshire.edu> wrote:
>
> On May 3, 2014, at 9:45 AM, Dave Tenny <dave.te...@gmail.com> wrote:
> >
> > The way I'm tempted to do this in clojure is
> >
> > (def ^{:dynamic true} *x* (atom 1))
> > ... do stuff with @*x* ...
> > (reset! *x* 2)
> > ... do stuff with @*x* ...
> > (binding [*x* (atom 3)] (do stuff with @*x*))
>
>
> Having also come from Common Lisp and having once done things similar to
> your suggestion in Clojure, I got burned by the fact (I *think* it was a
> fact) that "binding" created thread-local bindings that reverted to global
> bindings inside of code executed in another thread, e.g. in a pmap buried
> somewhere within the code executed within the binding form. I found this to
> be unexpected and problematic.
>
> Trying some simple examples with your outline, however, I don't see this
> happening. And I wonder if it's because of changes in more recent versions
> of Clojure related to ^{:dynamic true}.
>
> Does anyone know if the reversion of "binding"-bound vars to global
> bindings when crossing thread boundaries has really been eliminated? Or am
> I just not seeing it because my examples have been too simple?
>
> -Lee
>
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