On 8 Dec 2013, at 14:21, Alex Miller <[email protected]> wrote:
> If you're starting with lein repl then I would expect errors to be printed at
> the console - that's the actual process running the code. It's also possible
> that the thread's untaught exception handler doesn't print. I know that the
> expectation for async go blocks is that you should catch and handle any
> error. Have tried catching Throwable in your thread block and printing?
Yup - that works fine (see below).
The implication, I guess, is that nrepl doesn't set the default uncaught
exception handler? I find that surprising?
user=> (require '[clojure.core.async :refer [thread <!!]])
nil
user=> (defn thread-add [x y]
#_=> (thread
#_=> (try
#_=> (if (zero? y)
#_=> x
#_=> (let [t (thread-add (inc x) (dec y))]
#_=> (<!! t)))
#_=> (catch Throwable e (println e)))))
#'user/thread-add
user=> (<!! (thread-add 10 10))
20
user=> (<!! (thread-add 10 2000))
Exception in thread "async-thread-macro-1986" java.lang.OutOfMemoryError:
unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:691)
at
java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:943)
at
java.util.concurrent.ThreadPoolExecutor.processWorkerExit(ThreadPoolExecutor.java:992)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
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On 8 Dec 2013, at 14:21, Alex Miller <[email protected]> wrote:
> If you're starting with lein repl then I would expect errors to be printed at
> the console - that's the actual process running the code. It's also possible
> that the thread's untaught exception handler doesn't print. I know that the
> expectation for async go blocks is that you should catch and handle any
> error. Have tried catching Throwable in your thread block and printing?
>
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