From: Paul Brannan <pbrannan@...>
Date: 2008-03-14T22:32:33+09:00
Subject: Re: Thread#raise, Thread#kill, and timeout.rb are unsafe

On Fri, Mar 14, 2008 at 07:43:28AM +0900, Yukihiro Matsumoto wrote:
> Hi,
> 
> In message "Re: Thread#raise, Thread#kill, and timeout.rb are unsafe"
>     on Fri, 14 Mar 2008 06:00:54 +0900, Paul Brannan <pbrannan@atdesk.com> writes:
> 
> |I'm not convinced KeyboardInterrupt can be handled safely, either, in a
> |script.  What happens if a KeyboardInterrupt exception is raised inside
> |an ensure block?  It could easily result in resource leaks.
> 
> You are right, but keyboard interrupt has been there so long in the
> history, and we hardly see such leak problems, so I assume it's safer
> than you might think.  At least, we cannot not removed the interrupts
> from the language.

For simple scripts, KeyboardInterrupt is probably the right behavior.

For applications that use an event loop, we can use trap('INT') to
disable KeyboardInterrupt.

I wonder if there should be an equivalent trap mechanism for other
asynchronous exceptions?

Paul