After digging into it the source for me it seems as D is lacking
a "standardized" atomic library. It has some basic concepts, but
far behind the c++ standards.
I don't know if there are any RFC-s in this topic but it requires
a lot of work. Just to mention some by my first experience:
cas
in all api I've seen on a failed swap, the current value is
retrieved
(in c/c++ there are intrinsic for them)
exchange
no api for it and not implementable without spinning
(in c/c++ there are intrinsic for them)
atomicFence
No memory ordering is considered in the API
Even tough it falls back to the strongest/slowest one for the
current implementation it should be part of the API.
If D wants be be a real system programming language (ex a
replacement for c++) please address these issues. I'm not an
expert on the subject, but D seems to be in a c++11 stage where
compiler/memory barriers and atomic had to be implemented
differently for each platform and the programmer could only hope
that compiler won't f*ck up everything during optimization.
I don't know if D compiler is aware of the fences and won't move
out/in instructions from guarded areas.
Thanks: gzp
