Macos in ci #342
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Macos in ci #342
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More or less a verbatim copy-paste minus some edgy variable naming and internal `piker` module imports. There is a bunch of OHLC related defaults that need to be dropped and we need to adjust to an optional dependence on `numpy` by supporting shared lists as per the mp docs.
First attempt at getting `multiprocessing.shared_memory.ShareableList` working; we wrap the stdlib type with a readonly attr and a `.key` for cross-actor lookup. Also, rename all `numpy` specific routines to have a `ndarray` suffix in the func names.
Demonstrates fixed size frame-oriented reads by the child where the parent only transmits a "read" stream msg on "frame fill events" such that the child incrementally reads the shm list data (much like in a real-time-buffered streaming system).
When backpressure is used and a feeder mem chan breaks during msg delivery (usually because the IPC allocating task already terminated) instead of raising we simply warn as we do for the non-backpressure case. Also, add a proper `Actor.is_arbiter` test inside `._invoke()` to avoid doing an arbiter-registry lookup if the current actor **is** the registrar.
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Replacement for #255 and hopefully a precursor to landing #341 馃殌