Ok
The exception is most likely coming from js_check_stack_overflow().
The two threads do NOT share the stack (separate stacks), so
size = ctx->stack_top - js_get_stack_pointer()
is likely giving an incorrect result.
To get this to work, consider using the EMSCRIPTEN definiitions of
js_get_stack_pointer() and js_check_stack_overflow (at line 1976 of
quickjs.c).
You can create a new context for the second thread -- this can share
objects with the first thread and its context (I haven't tried this
personally). This is probably tricky, but using the "no-operation"
versions of the stack-check function is also very hacky.
Please note that this entire analysis is pretty much a wild-assed
guess.
Fred Weigel
