[dmd-concurrency] shared arrays

[Andrei Alexandrescu]

Michel Fortin wrote:
> Le 2010-01-14 à 18:07, Andrei Alexandrescu a écrit :
>> Unfortunately, this(this) is called after the bits have been
>> copied, so if there was any tearing, it already happened. I don't
>> know how we can solve this.
> 
> Where is the copy-constructor when we need one? :-)

I realized that fortunately that's not a problem: during memcpy, the 
target is not yet shared. Whew. So it all holds water.

this(this) shared { ... }

should work.

> Now, the really tricky question is should this one be copyable when
> shared:
> 
> struct D { immutable string a; long b; }
> 
> Since 'a' is immutable, you don't need to copy it atomically, only
> 'b' requires an atomic copy. So copying the struct "atomically" is
> possible by copying 'a' normally and 'b' atomically. Now, is that
> going to be supported?

But long isn't atomically copyable. Did you mean int?


Andrei