Re: Multi-thread Semantics (Re: Selenophobia)

[Philipp Janda <siffiejoe@...>]

Am 02.04.2017 um 12:56 schröbte steve donovan:
> No reason why shared references to _user data_ could not be allowed,
> although of course they need to be protected by a mutex. I like the
> Rust approach, where you temporally get a mutable reference and
> promise to give it back quickly

You would have to prevent them from being garbage-collected as well, and 
lua_close() is forbidden until all userdatas from a particular Lua state 
aren't used in other states anymore. Doable? Sure. But rather complicated.

Same goes for general tables and closures. You can get 95% right easily, 
but the last 5% can drive you crazy. So I'm fine with threading 
libraries drawing the line at primitive values (and maybe 
arrays/dictionaries of primitive values).

Philipp