Jim Jewett wrote:
On 3/29/07, Ron Adam <rrr@ronadam.com> wrote:
Jim Jewett wrote:
What we really need is a Task object that treats shared memory (perhaps with a small list of specified exceptions) as immutable.
* A 'better' task object for easily creating tasks. + We have a threading object now. (Needs improving.)
But the task isn't in any way restricted. Brett's security sandbox might be a useful starting point, if it is fast enough. Otherwise, we'll probably need to stick with microthreading to get things small enough to contain.
* Shared memory - + Prevent names from being rebound + Prevent objects from being altered
I had thought of the names as being part of a shared dictionary. (Of course, immutable dictionaries aren't really available out-of-the-box now, and I'm not sure I would trust the supposed immutability of anything that wasn't proxied.)
Not all that different. The immutable dictionary would be an implantation detail of a locked name space I think. I'm wondering if there might be a way to have an inheritance by container relationship, where certain characteristics can be acquired from parent containers. Not exactly the same as class inheritance.
frozen: object can't be altered while frozen locked: name can't be rebound to another object
3. Pass mutable "deep" copies back and forth. ? Works now. (but not for all objects?)
Well, anything that can be deep-copied -- unless you also want the mutations to be collected back into a single location.
It would need to be able to make a round trip.
4. Pass frozen mutable objects. - Needs freezable/unfreezable mutable objects. (Not the same as making an immutable copy.)
And there is where it starts to fall apart. Though if you look at the pypy dict and interpreter optimizations, they have started to deal with it through versioning types.
I didn't find anything about "versioning" at these links. Did I miss it?
http://codespeak.net/pypy/dist/pypy/doc/interpreter-optimizations.html#multi...
http://codespeak.net/pypy/dist/pypy/doc/interpreter-optimizations.html#id23
_Ron