Hi Yin,
No worries. Buf lives at least as long as myfun does.
https://www.lua.org/pil/6.1.html
Cheers,
Nick
On 18 Mar 2017, at 13:01, Yin Zhu <zhuyin.nju@xxxxxxxxx> wrote:
Hi LuaJit List,
I am putting a few functions into a lua file, which is used as a module
(e.g., to be 'require'd in a script).
This module has a few local variable which are used in the functions. I am
not sure of the life time of these variables; will they be GC'ed when the
function refer to them?
As an example, the following lua file has buf as a local variable and buf is
used to store the output of a C function. I don't know when will LuaJit will
GC buf. Is it possible that when I call the Lua function myfun, the local
variable is GC'ed?
Thanks!
modula_a.lua:
ffi.cdef[[
void myfun(int input, char *buf, int bufsize);
]]
local buf = ffi.new('char[1024]')
local myfun = function(i)
ffi.C.myfun(i, buf, 1024) -- call C function to get output in buf
return ffi.string(buf) -- convert buf to Lua string
end
return { -- expose myfun, but not local variables
myfun = myfun
}
