From: James Gray <james@...>
Date: 2008-05-05T04:02:47+09:00
Subject: Re: Don't wait for Exception in threads

On May 4, 2008, at 1:48 PM, Emil Sandin wrote:

> I have two threads running in parallell, like this:
>
> ####################
>
> t1=Thread.new{
>  50.times{
>    p "thread one"
>    sleep 0.1
>  }
> }
>
> t2=Thread.new{
>  p "thread two"
>  raise "error in thread two"
> }
>
> t1.join
> t2.join
>
> #################
> The output is:
> "thread one"
> "thread two"
> "thread one"
> ... 48 times more "thread one"
> "thread one"
> testscript.rb:15: error in thread two (RuntimeError)
>  from testscript.rb:19:in `join'
>  from testscript.rb:19
>
> The program waits for the first thread to complete before telling me
> that the second one raised an exception.
> I don't want to wait until the first thread finishes to see the
> exception, I want to see it right away.
> How can I do that?

Add this line early in your program:

   Thread.abort_on_exception = true

Hope that helps.

James Edward Gray II