Re: Is the registry needed?
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- Subject: Re: Is the registry needed?
- From: Alexey Melnichuk <alexeymelnichuck@...>
- Date: 2015年9月30日 10:51:38 +0400
> The registry, a table, is SLOW. Can we use upvalues instead?
upvalues plus C function is closure which is Lua value not C value.
So how you plan call this closure from C code. E.g. you have function
which wrap C handle/buffer to Lua object
`int mylib_push_object(lua_State, void *handle)`
How you plan find closure/metatable without any Lua table (global/registry)?
Registry is better than global.
But using registry to store all library data is not necessary. I
prefer use my own table which stores as upvalue in all library
functions and store this table in Lua registry to be able access to it
from C code. I use lightuserdata as key not luaL_ref because to use
luaL_ref in multi threaded environment it require uses some TLS.
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