From: Joel VanderWerf <vjoel@...>
Date: 2004-12-20T15:45:10+09:00
Subject: Re: threads and errors

Charles Mills wrote:
> What techniques are available for handling errors that occur in
> threads?
> 
> For example how do I find out that an error occured in t below?
> 
> t = Thread.new { raise "error" }
> 
> I need to be able to check on the error status of threads from their
> parent.  Something like the following would be ideal - but I know this
> won't do what I want:
> 
> begin
> Thread.new { raise "error"}
> rescue
> puts $! # in a strange world prints "error", but in actuality does
> nothing
> end

Another approach:

   begin
     Thread.new(Thread.current) do |th|
       begin
         raise "error"
       rescue => e
         th.raise e
       end
     end
   rescue => e
     p e
   end