[Cython] Acquisition counted cdef classes

[mark florisson]

On 24 October 2011 22:03, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> mark florisson wrote:
>>
>> These will by default not lock for operations to allow
>> e.g. one thread to iterate over the list and another thread to index
>> it without lock contention and other general overhead.
>
> I don't think that's safe. You can't say "I'm not modifying
> this, so I don't need to lock it" because there may be another
> thread that *is* in the midst of modifying it.

Oh yes you're definitely right, that was silly of me. I suppose every
operation needs to lock. This can still be useful though, to allow
more fine-grained parallelism. Then it would be more efficient to use
arrays or memoryviews with acquisition counted objects, and the
dicts/lists/tuples etc for cases where you just need more fine-grained
locking and can deal with that overhead.

> --
> Greg
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