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On Mac OS X, if ruby is built with --enable-pthread, you cannot (ever?) use exec; you'll get an EOPNOTSUPP error. Doing some Googling I've found that it's because not all the pthreads in the app are terminated/joined, and Mac OS X won't exec while other threads are running, http://www.ruby-forum.com/topic/101243
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Date: 2007-03-20 11:39 Sender: Akinori MUSHA I'll handle this. Will commit a fix tonight.