Hello Allen,
Allen Bierbaum wrote:
> I have been trying to wrap my head around this one for a while and
> can't convince myself or anyone else of how it works or how it should
> work. So hear goes.
>
> The baseline:
>
> - OpenSG objects are created in aspects with change lists to sync
> between aspects
> - MTRecPtrs allow referencing objects across multiple aspects (and
> threads) by looking up the aspect associated with the current thread
> and looking at that copy of the object.
yup.
> But, what happens if:
>
> - I have a primordial rendering thread and 2 background threads (P,
> B1, B2) (each with their own default OpenSG settings)
> - I create an object in P, store it with an MTRecPtr p_node, and share
> that Ptr with B1 and B2
you need to sync the aspect of P with those of B1 and B2 before you can
access the object from either thread.
BTW this has not really changed from 1.x, except that in 1 the copies of
P where already existing in the B1/B2 aspects, however they did *not*
contain the correct values before the sync.
> - When B1 or B2 accesses it, what data do they see? (assuming no
> manually changelist syncing)
if there has been no sync from the aspect of P to those of B1/B2 your
application is likely to crash. The object you are trying to access does
not exist before the sync.
> - What happens if in B1 I add a new node (b1_child) as a child of p_node?
b1_child only exists in the aspect of B1 until you sync from aspect of
B1 to aspect of P and aspect of B2.
> Now option 2, what happens if I do this instead:
>
> - Same as above, but I explicitly set the aspect id for all threads to
> be the same as the primordial thread
you have three threads operate on the same aspect so becomes your own
responsibility to coordinate their actions.
Cheers,
Carsten
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