avoiding copy - Luajit FFI

[Fabio Kaminski <fabiokaminski@...>]

Hi Folks,

Im trying to get less memory copy as possible with luajit FFI, and in
the api to get your hands in a (void *) or (char *) pointer
is copying it through "ffi.string()" wich in turns, will create a lua string..

my first question: why cant ffi.string() reuse the given pointer.. vm
design? avoid concurrency races  from the C side?

the c api "lua_pushlstring()" works the same way?

second:

When you simply need to push a string or even a file buffer thats
fine, but if whe are talking about things like byte buffers over a
network
those copy would make it loose a lot of performance in the long run..
even creating a bytebuffer on the C side and passing only the
requested byte string on the lua api side..

Anyone has found a way (writing c logic or not) to avoid those copies?