Re: Multi-process C calling Lua: sharing data between Lua scripts?

[Viacheslav Usov <via.usov@...>]

On Sat, Feb 27, 2021 at 5:29 AM caco <cacophonitrix@protonmail.com> wrote:
>
> From C I have master process in parallel with number of agent processes each binding a luaL_State. I want the agents Lua scripts to communicate through Lua supervised (i.e. gc'd) data. How can I do this?

Since you said "process", not "thread", it should be said that in a
modern OS such as (a recent version of) Linux, MacOS and Windows,
distinct processes have isolated memory spaces and cannot touch memory
in another process, with one exception.

Without the exception, your only option is to serialize and
deserialize data as byte chunks and use some IPC to transport the
chunks between processes.

The exception is shared memory. With it, you get all the complications
of multiple threads and then some more. Depending on how badly you
want your thing, this might be something to consider.

Cheers,
V.