[dmd-concurrency] composability

[Benjamin Shropshire]

Andrei Alexandrescu wrote:
> Benjamin Shropshire wrote:
>> OTOH that is just another form of the CAS 2 vs CAS 3 problem. The 
>> system only works if you have the right abstractions.
>
> What do you mean by CAS 2 and CAS 3?
>

The problem Kevin cited of their being 1 and 2 word CAS ops, but no 3 
word CAS, and if their was a 3 word CAS, then there not being a 4 word 
CAS. My point being that you will end up always with some case being 
just out of reach.

> Andrei
>
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