yes, it does...I should have mentioned this in my original email (I've had some "real-world" problems with this scenario :)
On Tue, Sep 30, 2008 at 2:01 PM, Ben Goertzel <[EMAIL PROTECTED]> wrote: > > gotcha > > but even so: doesn't this violate Linas's immutability assumption somehow? > > ben > > On Tue, Sep 30, 2008 at 1:58 PM, Joel Pitt <[EMAIL PROTECTED]> wrote: >> >> As far as I'm aware only the incoming set can change... >> >> The outgoing set is fixed when you add a link to the AtomSpace/AtomTable. >> >> J >> >> On Tue, Sep 30, 2008 at 10:55 AM, Ben Goertzel <[EMAIL PROTECTED]> wrote: >> > >> > Also, of course, the ingoing or outgoing set of an Atom may be changed >> > by a >> > MindAgent ... why is this not a problem for concurrency? >> > >> > On Tue, Sep 30, 2008 at 1:51 PM, Linas Vepstas <[EMAIL PROTECTED]> >> > wrote: >> >> >> >> 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 >> > >> > >> > >> > -- >> > Ben Goertzel, PhD >> > CEO, Novamente LLC and Biomind LLC >> > Director of Research, SIAI >> > [EMAIL PROTECTED] >> > >> > "Nothing will ever be attempted if all possible objections must be first >> > overcome " - Dr Samuel Johnson >> > >> > >> > >> > _______________________________________________ >> > Mailing list: https://launchpad.net/~opencog-dev >> > Post to : [email protected] >> > Unsubscribe : https://launchpad.net/~opencog-dev >> > More help : https://help.launchpad.net/ListHelp >> > >> > > > > > -- > Ben Goertzel, PhD > CEO, Novamente LLC and Biomind LLC > Director of Research, SIAI > [EMAIL PROTECTED] > > "Nothing will ever be attempted if all possible objections must be first > overcome " - Dr Samuel Johnson > > > > --~--~---------~--~----~------------~-------~--~----~ > You received this message because you are subscribed to the Google Groups > "OpenCog General Discussion List" group. > To post to this group, send email to [EMAIL PROTECTED] > To unsubscribe from this group, send email to > [EMAIL PROTECTED] > For more options, visit this group at > http://groups.google.com/group/opencog?hl=en > -~----------~----~----~----~------~----~------~--~--- > > -- "Frozen brains tell no tales." -- Buckethead _______________________________________________ Mailing list: https://launchpad.net/~opencog-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~opencog-dev More help : https://help.launchpad.net/ListHelp
