SharedArrayBuffer: True Shared Memory for JS Threads
SharedArrayBuffer is a shared whiteboard for JS threads, letting them access the same memory without slow data copies. It's used for high-performance parallel tasks. The footgun: without `Atomics` to coordinate, you'll get race conditions and corrupted data.
SharedArrayBuffer provides a raw memory block that can be viewed and modified by multiple JavaScript threads, like the main thread and Web Workers. This avoids the performance penalty of copying large datasets between them. It's essential for parallel computing tasks like in-browser video editing or complex data analysis. The critical footgun is that simultaneous, uncoordinated writes create race conditions. You must use the `Atomics` object to ensure operations are predictable and data remains intact.
Read the original → developer.mozilla.org
- #javascript
- #web workers
- #concurrency
- #performance
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