From: Shea Martin Date: 2006-03-24T03:23:52+09:00 Subject: unhandled exception in thread causes ruby to lose control Thread.abort_on_exception = true t = Thread.new{ puts "here" raise "exception" } sleep 3 puts "t thread is #{t.alive?}" exit 0 The above code will cause ruby to eatup 100% cpu, for an infinite amount of time on win32. If Thread.abort_on_exception is set to false, things work as expected. I think this is a bug. ruby 1.8.4 (2005-12-24) [i386-mswin32] ~S