Re: Is having lua_State per thread safe?

[Roberto Ierusalimschy <roberto@...>]

> > A lua_State is completly isolated, so they are thread safe. (Has been since
> > Lua 4.0)
> 
> Until Lua 5.0, the parser was not completely reentrant.
> So it is more correct to say that a lua_State is fully thread safe
> since Lua 5.1.

Reentrance in this case is not related to thread safety. The parser
in one state cannot be called while the parser in the same state is
working; the parser in a different state is completely unrelated.

Since Lua 4.0 Lua has multiple states, and different states do not share
any mutable data (even when parsing).

-- Roberto