Runtime

Threads

Shared memory, SharedArrayBuffer, workers, shared workers, headers, notifications, and browser support.

threadsworkerssharedarraybuffercoopcoepexperimental

WASM threads depend on shared memory and browser worker infrastructure. On the web, SharedArrayBuffer requires cross-origin isolation headers.

Use workers for CPU work and message passing.
Shared workers can coordinate state across tabs where supported.
Broadcast-style communication can use BroadcastChannel plus shared memory protocols.
Thread demos must degrade gracefully when headers or runtime support are absent.

References