Actually, it didn't work (apart from having a "not" in there, which I
only used for testing).
Calling sync directly works, though:
(ns clojure.core)
(defmacro dosync [& body]
`(do
(assert (javax.swing.SwingUtilities/isEventDispatchThread))
(sync nil ~...@body)))
But can't I somehow refer to the original dosync from my new dosync
macro?
On Jul 10, 11:52 pm, Rowdy Rednose <rowdy.redn...@gmx.net> wrote:
> This did the trick:
>
> (ns clojure.core)
> (defmacro dosync [& body]
> `(do
> (assert (not (javax.swing.SwingUtilities/isEventDispatchThread)))
> (#'dosync ~...@body)))
>
> This is great for testing!
>
> Thanks for your help, Stu. And btw the book is really great so far
> (and I'm almost through)! It provides a good overview of all the
> different aspects of clojure. And it contains a really gentle
> introduction to macros for newbies like myself.
>
> On Jul 10, 10:55 pm, Stuart Halloway <stuart.hallo...@gmail.com>
> wrote:
>
> > To rebind a macro in clojure.core you would need to first enter that
> > namespace:
>
> > (in-ns 'clojure.core)
>
> > Or, create your own dosync in a different namespace which explicitly
> > does not refer to clojure.core/dosync. See the docstring for
> > clojure.core/ns for using :exclude.
>
> > Stuart
>
> > > On Jul 10, 10:28 pm, Stuart Halloway <stuart.hallo...@gmail.com>
> > > wrote:
> > >> binding to a thread. The snake game could be extended to be a
> > >> simulation that runs on multiple threads (or perhaps even multiple
>
> > > Makes sense. For the example in the book it just seemed completely
> > > redundant. And when writing Swing code, at least in Java you often
> > > make use of the fact that everything is single-threaded, including all
> > > events. Otherwise life would be hell.
>
> > > In Clojure of course multi-threading is much easier, but I wonder
> > > whether in most clojure Swing applications, I should use clojure's
> > > transactions when only working on a single thread. Transactions do
> > > involve some overhead, which is unnecessary in most (of my) Swing
> > > applications. For cases where I have to leave the EDT, like blocking
> > > io, I do take care of threading issues.
>
> > >> You can rebind macros, but in order to use them you have to compile
> > >> some code again.
>
> > > Recompiling would be fine in this case, but how can I rebind macros?
> > > When doing a
>
> > > (defmacro dosync [& body] ...)
>
> > > it gives me this:
>
> > > java.lang.Exception: Name conflict, can't def dosync because
> > > namespace: user refers to:#'clojure.core/dosync (NO_SOURCE_FILE:8)
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