Shared Array Buffers, Atomics and Futex APIs

Adds a new JavaScript type SharedArrayBuffer. SharedArrayBuffers can be sent to Workers and without neutering the sent buffer. The underlying buffer will be shared between the workers. The Atomic API provides atomic loads and stores and Read/Modify/Write accesses to SharedArrayBuffers. The Atomic.wait provides the ability for a worker to wait for another worker to signal it, without having to spinlock.

Comments

It has a primary use case for asm.js code, but is also useful for implementing other higher-level sharing between Workers. See https://blog.mozilla.org/javascript/2015/02/26/the-path-to-parallel-javascript/ for some discussion of the possibilities. It also is likely to be how future WebAssembly shared memory is exposed to Web APIS. Note that Chrome's implementation of SharedArrayBuffer contains a non-standard attribute: SharedArrayBuffer.isView. The Blink team has an intent to remove it.

Demos

Documentation

Specification

Established standard

Status in Chromium

Blink>JavaScript


Enabled by default (tracking bug) in:

  • Chrome for desktop release 60
  • Chrome for Android release 60
  • Android WebView release 60

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

Owners

Last updated on 2018-05-09