[boost] [Signal] thread-safety (was: asio networking proposal)

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using signal/slots to handle the events.

The current design makes the callback function object (aka Handler) type a template parameter to give maximum scope for optimisation. However there is no reason that I can see why you can't pass a signal to be the handler.

I recall reading in the Boost.Signal documentation that the library is not thread-safe; meaning, it will probably do weird things when several threads register/unregister a callback simultaneously, etc. Has this limitation been addressed in the more recent versions of the library? Peter