Exploring Multicore Concurrency for Embedded Swift

[Max_Desiatov]

@Gonzalo_Larralde

The changes preserve non-PAL behavior, but they introduce additional PAL executor entrypoints.

I would advise holding this off for a bit as I'm overhauling this part for multi-threaded WASIp1 support. Our PRs will likely conflict if you put up something right now.

@Gonzalo_Larralde

Is the intended outcome simply a link failure due to missing PAL symbols?

Yes, that's the status code with Unicode tables already. It could be addressed with availability domains in the future.

@Gonzalo_Larralde

is there any acceptable fallback in this situation?

@Gonzalo_Larralde

Another alternative could be to require continuous-clock support for Embedded Concurrency as a whole

IIUC there are embedded platforms without clocks, where no acceptable fallback is available.

[Gonzalo_Larralde]

Noted! I’ve commented on the PR. I’ll pause work on this and wait for it to land.

In the meantime, I’ll switch gears. I think I can work on a couple of concrete PAL implementations for Pico and ESP32.