Shared memory sync/update question

T.J. Crowder tj.crowder at
Sat Sep 22 21:28:41 UTC 2018

Can anyone on the list help me with the shared memory details question
described here:
[Does `postMessage` or yielding to the event loop or similar sync shared

It seems like Lars T. Hansen's Mandlebrot example [here][2] also expects
memory to have been synchronized/updated as of the receipt of a
`postMessage` message (when a worker is done, it triggers a `workerDone`
message making the main thread redisplay), but there's an ``
involved there.

Just trying to get a clear idea of when (and whether) one can reliably,
in-specification trust that a thread will see updates from other threads
without using `Atomics.load` or similar to do every single read. Hansen's
Mandlebrot example uses a lock on a single element via `compareExchange`.
My experiment that never sees a stale read doesn't use `Atomics` at all
(but see the first link above for details).

Thanks in advance,

-- T.J. Crowder


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