Super useful for actor-based systems & data-sharing in general! A worker pretty much is an actor.

Timely ask too. CloudFlare just introduced Durable Objects. There's no durability implied here, but the general architecture, within a process, maps pretty clearly to SharedWorkers, each shared worker being a (process-local) (semi-sort-of-) durable object.

I just read up on that article, posted literally today, quite the coincidence, but it sure seems nice.
Those "Durable Objects" don't imply durability either, they seem to offer synchronization and speed instead, which is exactly what I needed this for.
I'm sure that Deno will have to eventually implement SharedWorkers, as multiple major browsers have them, so it's more of a question about when they will do it.

I was writing code that involved multiple workers to separate and parallelize code, there was one specific worker that had permission to access resources that were slow to use, thus why I moved it to a worker in the first place, and it requires synchronization.

Ex: synchronized read / write access to data on the disk. postMessages can come in at any time and fill up the event loop's queue, but the handler will only operate one at a time, you don't want to have multiple workers writing to a file at once.

For what I was doing, SharedArray buffers wouldn't have been useful, nor easy to keep in sync.

Overall though, the key idea was safety, as only one part of the code has exclusive access and sets up its own barrier to safely provide access to something, without sacrificing performance, as all of the work is done outside of the current thread.

The problem arrives when one wants access to those resources from within multiple workers at once. You can't exactly pass a worker into another worker worker[0].postMessage( workers[1] ), and creating another worker just adds bloat and beats the purpose here, so there is currently no viable alternative as Deno lacks SharedWorkers.

Request: SharedWorkers in Deno #7728

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