[Scummvm-devel] OSystem API?

[David Given]

I'm having a look at OSystem for the intent port. In particular, I'm looking 
at the mutex functions, and set_timer, and have some questions.

Is set_timer's callback supposed to be asychronous? Or is the callback only 
supposed to be executed when ScummVM is delayed? How does the GP32 port work, 
that doesn't implement set_timer()?

What are the mutexes used for? Some ports (the GP32, the Dreamcast) don't 
implement these, either. How much of the OSystem API is actually needed? Is 
the subset implemented by OSystem_NULL all I really need?

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