From: Yukihiro Matsumoto <matz@...>
Date: 2009-07-21T09:49:35+09:00
Subject: Re: Thread.abort_on_exception default to true

Hi,

In message "Re: Thread.abort_on_exception default to true"
    on Tue, 21 Jul 2009 06:45:03 +0900, Roger Pack <rogerpack2005@gmail.com> writes:

|here's a (somewhat contrived) ex:
|
|"deep within a some server: "
|
|Thread.new { send an email }
|
|# continue running, handle next request, etc.
|
|In this instance, I don't want to join on the thread because I am not 
|concerned about when it finishes--it doesn't matter to me, and I don't 
|want to wait for it as it would slow up processing my next request. 
|Therefore the exception is forgotten.

I think you'd better handle the exception in the thread block.

abort_on_exception means asynchronous exceptions will be delivered to
the main thread.  That means any exception may happen on any point in
the main thread.  From my point of view, asynchronous exception is
like a nightmare, especially for production code.  Most code is not
exception safe at that level.  That is the reason abort_on_exception
to be false by default.  That is only for debugging purpose.

							matz.