How to return a SharedArrayBuffer object

[annevk]

As far as I can tell a JS SharedArrayBuffer can enter IDL through an IDL ArrayBuffer that's effectively a pointer to the JS object.

Now assuming #342 is fixed and you can use [AllowShared] ArrayBuffer as return value, what language do you use to return a SharedArrayBuffer? Do you need to construct the JS object, then make an IDL ArrayBuffer object that points to it, and then return the IDL object?

[TimothyGu]

Since Web IDL never seems to say an IDL ArrayBuffer has to be an actual JavaScript ArrayBuffer, couldn't you just use ArrayBuffer as the return type in IDL? I.e., the [AllowShared] part in the return type isn't actually strictly necessary.

[domenic]

Sure, but how do you write spec prose saying that the IDL ArrayBuffer is actually a JavaScript SharedArrayBuffer? @annevk's last sentence points to one route, but it's kind of icky, as we'd like IDL to be an intermediary layer so that specs don't have to touch JS objects so directly.