Are module instances thread-safe?

[turbolent]

Are module instances thread-safe?

[turbolent]

is it undefined behavior to instantiate a module in thread A and then call into the instance in threads B, C, D, etc.? We can assume only one thread ever calls into the instance at any time.

(from the linked issue:)

is it okay if a module is instantiated by thread A, and then (after that has provably completed) thread B calls an exported function from that module instance, and then (after that has provably completed) thread C calls an exported function from the same module instance?

AFAICS, module instances do not have per-thread state, so as long as access is properly separated, such a usage should work. Please let me know if you are running into problems