Snippet

Constructing Non-Leaking Binary Buffers in Svelte Writable Stores via SharedArrayBuffer Wrappers

This snippet encapsulates raw SharedArrayBuffer objects inside custom Svelte writable stores using TypedArray views and Atomics. It maintains zero-copy thread-safe binary operations while triggering reactive Svelte UI updates only when explicit Atomic mutations occur.

snippet.js

javascript

import { writable } from 'svelte/store';
 
export function createSharedBufferStore(byteLength) {
  const sab = new SharedArrayBuffer(byteLength);
  const view = new Int32Array(sab);
  const { subscribe, set } = writable(view);
 
  return {
    subscribe,
    updateAt(index, value) {
      Atomics.store(view, index, value);
      set(new Int32Array(sab));
    },
    getValueAt(index) {
      return Atomics.load(view, index);
    }
  };
}

svelte

Breakdown

const sab = new SharedArrayBuffer(byteLength);

Allocates a fixed-length raw binary data buffer shared across memory contexts.

const view = new Int32Array(sab);

Creates a 32-bit signed integer typed array view over the underlying shared memory.

Atomics.store(view, index, value);

Executes an atomic store operation ensuring concurrent write safety without locks.

set(new Int32Array(sab));

Emits a new typed array reference to trigger Svelte subscriber notifications.

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Constructing Non-Leaking Binary Buffers in Svelte Writable Stores via SharedArrayBuffer Wrappers

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