From: Roger Pack <rogerpack2005@...>
Date: 2011-03-23T23:37:51+09:00
Subject: Re: 1.9 Threads in a GUI not behaving as expected (Windows)

Your c block needs to be within rb_thread_blocking_region to not block 
the (UI responding) ruby threads, I'm thinking.

ref: 
http://en.wikibooks.org/wiki/Ruby_Programming/Reference/Objects/Thread#Thread

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