Hello, I've updated the Boost.FSM library in the Vault with the following changes: - Several threading issues pointed out by Steven Watanabe were fixed. - Some minor optimizations added to reduce the amount of generated code and possibly speed up compilation a little. - Exception classes are now exposed with default visibility on GCC 4.0 and later under Linux. I'm not sure if other compilers/platforms need this and have support for similar feature. - A new example "BitMachine" added. It is quite similar to same-named example of Boost.Statechart and may be used as a performance test. - The Performance section of the docs updated with some test results. The link stays the same: http://tinyurl.com/yjozfn -- Best regards, Andrey mailto:andysem@mail.ru