> From a background thread, unless `--optimize_for_size` or
> `--predictable` is set, in which case they run on the foreground
I did a bunch of experiments and I can only see the second pass weak handle
callback called from the message pump loop. I didn't specify those options
explicitly (assuming they would be in args.gn) and don't know if they would
be on by default. Will look more into this. Good to know this bit. I will
look more into these build options.
> The foreground thread. If the script never yields control, you can't
> pump the message loop.
Did some more testing and it seems that v8 platform is thread-safe and the
message pump may be called from different threads for their individual
isolates, which makes it possible to pump for messages in long-running
native calls, like waiting for database results. Makes the code more
complex, though - much easier to deal with the pump when JS code is written
as a series of callbacks.
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