added Atomics and SharedArrayBuffer

[ibaryshnikov]

Added Atomics and SharedArrayBuffer to js-sys.
Ready for review.

Closes #1443

[alexcrichton]

Looking good! I wonder if this could take a leaf from types like JSON to and have a mod Atomics { ... } instead of a type Atomics?

[alexcrichton]

Looking great @ibaryshnikov!

Thinking some more on this, what do you think of changing f64 to i32? It looks like it's documented that you can only pass integer arrays up to 32 bits, so using i32 may actually cover everything here and may be easier to use than dealing with floats (and perhaps faster since floats sometimes have a bit of a cost to them).

[ibaryshnikov]

Oh, I didn't notice it in the beginning. I thought that f32 and f64 typed arrays were allowed for operations like add. Using i32 looks fine to me. What about u32?

[alexcrichton]

Both u32 and i32 work but i32 doesn't need a job shim to switch the number to unsigned, so I think I'd lean towards i32 for this

[ibaryshnikov]

Fine. I also need to change static_method_of = Atomics to js_namespace = Atomics after changing from pub type Atomics to pub mod Atomics, right?

[alexcrichton]

That sounds right yeah, I sort of forget the specifics but if it works it works!

[alexcrichton]

Did you still have changes you wanted to make or is this good to go?

[ibaryshnikov]

I'd like to write tests, but I can do it in a separate pr, so we can merge this I think.

[ibaryshnikov]

@alexcrichton thank you for very useful comments!