One technique for addressing this sort of issue has been described in
Haskell-land:

https://www.schoolofhaskell.com/user/snoyberg/general-haskell/exceptions/catching-all-exceptions
http://hackage.haskell.org/package/enclosed-exceptions

I'm unaware of any comparable clojure library, but the same technique
probably works.

A simpler technique in this case would be to only catch the kinds of
exceptions that you expect the inner block to throw, rather than "catching
all exceptions" with (catch Exception e ...).

-- Dan Burton

On Fri, Apr 29, 2016 at 6:35 AM, Ashish Negi <thisismyidash...@gmail.com>
wrote:

> To stop any thread.. interrupts are send to it.
> And threads handle this by throwing exception so that programmer can
> decide what to do
> depending upon the kind of exception it gets. (you may get different
> exceptions)
>
> Since you are catching the exception, your thread is never stopped.. and
> hence future-cancel returns false.
>
> If you throw again.. exception would unwind your while loop and stop the
> thread.
> hence.. future-cancel is able to stop the thread and returns true.
>
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