2008/9/30 Ben Goertzel <[EMAIL PROTECTED]>: > > Linas, > > But the truth values, attention values, etc. associated with an Atom are not > immutable ... > > so for instance, a MindAgent could add a new Version within a > CompositeTruthValue > object associated with an Atom ...
Hmm. Well, if one thread is looking at a truth value while another is setting it, then, in today's system, there would be a crash (because the old value is deleted, and Atom::getTruthValue() returns a reference). This could be solved by having AtomTruthValue() return a copy, instead of a reference; but then one pays the penalty of creating a copy, for each and every access. (this is "copy-on-read"). By contrast, in a garbage-collected system, the worst that would happen is that someone is looking at an "old, stale" truth value; as opposed to crashing. By the principles of concurrency, there's "no such thing" as an "old stale value" in between synchronization primitives. --linas _______________________________________________ Mailing list: https://launchpad.net/~opencog-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~opencog-dev More help : https://help.launchpad.net/ListHelp
