On Tuesday, March 12, 2013 8:59:47 AM UTC+1, edw...@kenworthy.info wrote:

> So I do not understand why calling
>
>   (defn evolve []
>     (Thread/sleep 1000)
>     (print ".")
>     (recur))
>
> Never results in anything being printed until I press Ctrl-C at which 
> point a bunch of . are printed.
>
> However if I remove (Thread/sleep 1000) then it works as I would expect.
>

Actually it works the same in both cases: the dots are printed in chunks as 
large as the buffer size of the *out* writer. You just didn't have the 
patience to wait that many seconds :) Try with (Thread/sleep 1) and you'll 
see.

I thought (Thread/sleep 1000) would basically wait for a second (allowing 
> other threads to run) and then continue but it *appears* to work as I would 
> expect but it blocks output (both to the console and, I think, to the 
> seesaw frame/canvas created separately).
>

It does work exactly as you expected: it allows other threads to run. You 
must be very careful in knowing exactly *which* thread it makes sleep. As 
for the console output, the real reason is as explained above.

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