[Vm-dev] Immutability bit? Eliot?
goran at krampe.se
Tue May 26 08:17:39 UTC 2009
Hi VM gurus!
I just responded to a persistence thread on the seaside-list and it
occurred to me that I should ask you guys - especially Eliot I guess -
will the new VM have support for detecting object modification?
...and oh, when do we get the new awesome VM? I am doing reload on
mirandabanda every day but no luck so far... :) :)
Cees de Groot explained a technique (a long while back) using an
immutability bit on objects - combined with some Exception being
signalled when an immutable object is about to be modified. This way you
get both support for immutable objects AND "dirty marking" because you
can always catch the Exception, add the object as "dirty" in a pool, and
Especially for all the persistence solutions out there this would be
great to have - and would eliminate trickery like WriteBarrier:
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