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I don't think it's true that the engine must be using a mutex to support it's async functionality. Or that it is true that an OS mutex will be any more efficien

I don't think it's true that the engine must be using a mutex to support it's async functionality. Or that it is true that an OS mutex will be any more efficient than alternative solutions. A mutex really can only exist to serialize async code. If you want it serialized that likely means that code shouldn't be async in the first place.

kbenson 7y ago
You're right that it may not be required for the async functionality (especially since lock-free schedulers exist, and the engine is basically a single processor scheduler for processes). I do think it's likely in use other places though, just because it's much easier to write correct code with one.