Snippet

Shared Memory Slice Manipulation Using TypedArray Sub-slices

TypedArray sub-slices allow multiple views over a shared block of memory (SharedArrayBuffer). Mutating values atomically through one slice immediately reflects across all overlapping array views.

snippet.js

javascript

import assert from 'node:assert/strict';
 
const sharedBuffer = new SharedArrayBuffer(1024);
const masterArray = new Int32Array(sharedBuffer);
masterArray[0] = 42;
 
const subView = new Int32Array(sharedBuffer, 0, 4);
assert.equal(subView[0], 42);
 
Atomics.add(subView, 0, 10);
assert.equal(masterArray[0], 52);

nodejs

Breakdown

const sharedBuffer = new SharedArrayBuffer(1024);

Allocates a fixed-length raw binary buffer accessible across worker threads.

const subView = new Int32Array(sharedBuffer, 0, 4);

Creates a typed window mapping directly onto a specific offset of the underlying shared memory.

Atomics.add(subView, 0, 10);

Performs a thread-safe atomic addition directly operating on the shared array slice memory.

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Shared Memory Slice Manipulation Using TypedArray Sub-slices

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