Nigel Rantor wrote: > > John Nagle wrote: >> Immutability is interesting for threaded programs, because >> immutable objects can be shared without risk. Consider a programming >> model where objects shared between threads must be either immutable or >> "synchronized" in the sense that Java uses the term. >> Such programs are free of most race conditions, without much >> programmer effort to make them so. > > I disagree. They are not free of most race conditions, and it still > takes a lot of effort. Where did you get this idea from? Have you been > reading some Java primer that attempts to make it sound easy?
Read again what he wrote. In a language with only immutable data types (which doesn't mean that you can't efficiently create modified versions of a data container), avoiding race conditions is trivial. The most well known example is clearly Erlang. Adding "synchronised" data structures to that will not make writing race conditions much easier. Stefan -- http://mail.python.org/mailman/listinfo/python-list
